A large aperture mirror support structure adapted to a variety of angle gravity fields

Abstract

A large aperture mirror support structure suitable for various angle gravity field relates to the field of large aperture mirror assembly support design of space optical remote sensing, is connected to the back of the mirror, and comprises a triangular back plate, three whiffletree support structures and three radial support structures, the three whiffletree support structures and the three radial support structures are connected to three corner portions of the triangular back plate respectively, three circular nested holes are arranged on the back of the mirror, the end of the radial support structure is bonded to the circular nested hole, and each whiffletree support structure comprises a plurality of bonding pads which are bonded to the back of the mirror by glue injection. The mirror is supported in quasi-static state, the support structure is compact in structure and high in rigidity, so that when the optical axis of the mirror is placed at different angles relative to the direction of gravity, the mirror surface quality is easy to be high.

Description

Technical Field

[0001] This application belongs to the field of support design for large-aperture reflector components for space optical remote sensing, and specifically relates to a support structure for large-aperture reflectors that can adapt to gravitational fields at various angles. Background Technology

[0002] Whiffletree support structures are commonly used to support large-aperture mirrors. Common whiffletree support structures include 6-point, 9-point, 18-point, 27-point, and 36-point supports. Whiffletree support structures can only constrain three degrees of freedom (TZ, Rx, and Ry) for large-aperture mirrors. To constrain all six degrees of freedom of a camera, allowing for arbitrary placement of the large-aperture mirror while maintaining the required surface shape under gravity, it is generally necessary to add six flexible rods to the side of the large-aperture mirror. These six flexible rods constrain the three degrees of freedom (TX, TY, and RZ). For example, the Sofia primary mirror uses an 18-point bottom whiffletree support and three A-frame supports on the side of the mirror. The 18-point bottom whiffletree support only constrains the TZ, Rx, and Ry degrees of freedom, while the three A-frame supports on the side constrain the TX, TY, and RZ degrees of freedom.

[0003] The three support points where the whiffletree ultimately converges are far from the flexible support points around the mirror. To ensure support rigidity, a very rigid and heavy ring needs to be added around the main mirror, resulting in a large outer contour of the entire mirror and a heavy support structure, which is extremely unfavorable for lightweight design of the support structure.

[0004] Due to size and weight limitations, current space camera support for large-aperture mirrors can only ensure that the mirror's surface shape meets usage requirements under gravity, either with the optical axis horizontal or vertical. In many ground-based tests and experiments, not only is a good surface shape required when the optical axis is horizontal, but the surface shape must also meet requirements when the optical axis is vertical. (Theoretically, the surface shape of the same support structure is Rms1 when the optical axis is vertical and Rms2 when the optical axis is horizontal. Therefore, when the optical axis makes any angle θ with gravity, the surface shape of the primary mirror is Rmsθ = ((Rms1 × sinθ)). 2 +(Rms2×cosθ) 2 ) 1 / 2 Since a space camera can only satisfy the surface shape under gravity in one direction, when the space camera is placed at a certain angle to the direction of gravity, the surface shape will not meet the requirements. Therefore, additional, complex or bulky unloading fixtures are needed to unload the mirror to ensure that the surface shape meets the requirements when the mirror is tested at different angles.

[0005] Ground-based large-aperture astronomical telescopes can meet the requirements for primary mirror shape under different gravitational forces. However, since astronomical telescopes have no weight limitations, the primary mirror is typically unloaded by hanging weights on the bottom or side, or by using multiple brakes to actively control the shape of the reflecting mirror. This support method is not only bulky and heavy, but also difficult to meet the size and weight requirements of space cameras. Summary of the Invention

[0006] The technical problem solved by this application is to overcome the shortcomings of existing technologies and provide a support structure for large-aperture mirrors that can adapt to gravitational fields at various angles. Based on an improved support structure of Whiffletree support, by changing the form and position of the circumferential support structure of the mirror, a quasi-statically determinate support for the mirror is achieved. The support structure is compact and has high rigidity, making it easy to achieve high mirror surface quality when the optical axis of the mirror is placed at different angles relative to the direction of gravity. It can be applied to the support design of large-aperture mirrors for space cameras.

[0007] The technical solution provided in this application is as follows:

[0008] A large-aperture reflector support structure adaptable to various gravitational fields is connected to the back of the reflector. It includes a triangular back plate, three whiffletree support structures, and three radial support structures. The three whiffletree support structures and the three radial support structures are respectively connected to the three corners of the triangular back plate. There are three circular nesting holes on the back of the reflector. The ends of the radial support structures facing the reflector are bonded to the circular nesting holes. Each whiffletree support structure includes multiple adhesive pads, which are bonded to the back of the reflector by adhesive injection.

[0009] The whiffletree support structure also includes a lever beam, triangular support blocks, support rod cups, and flexible support rods. The lever beam is rotatably connected to the triangular back plate, and the rotation axis of the lever beam is in the same plane. Two triangular support blocks are provided, and the two triangular support blocks are respectively connected to the two ends of the lever beam facing the surface of the reflector. Each corner of the triangular support block is fixedly connected to a support rod cup. The support rod cup has a through hole, and the end of the flexible support rod is inserted into the through hole. The through hole and the outside of the flexible support rod are fixed by glue injection. An adhesive pad is attached to the end of the flexible support rod facing the back of the reflector.

[0010] The whiffletree support structure also includes a flexible joint hinge. The triangular support block is connected to the lever beam through the flexible joint hinge. The flexible joint hinge has two rotation axes, the x-axis and the y-axis, so that the triangular support block and the lever beam can achieve rotational freedom in both directions around the x-axis and the y-axis.

[0011] The three radial support structures are distributed at 120° relative to the center of the reflector. Each radial support structure includes a nest, a flexible sheet, a limiting block, a movable plate, and a conical beam. The conical beam is connected to the surface of the triangular back plate facing the back of the reflector, and the movable plate is connected to the end of the conical beam away from the triangular back plate. The nest is bonded to the nesting hole of the reflector with epoxy adhesive. A limiting ring is provided on the inner side of the nest, and the limiting block is connected to the inner side of the nest. The limiting block is located on the side of the limiting ring away from the reflective surface of the reflector. The flexible sheet is installed on the inner side of the nest. The edge of the flexible sheet has a mounting ring, which is located between the limiting ring and the limiting block. The movable plate is located between the flexible sheet and the limiting block. The central area of ​​the flexible sheet is deformable in the plane normal direction.

[0012] The flexible sheet has at least two grooves, which start from the edge of the flexible sheet and extend gradually toward the center of the flexible sheet in a planar spiral manner.

[0013] The thickness of the flexible portion of the flexible sheet is t, the inner radius of the flexible sheet is r1, the outer radius of the flexible sheet is r2, and r2-r1≥10t.

[0014] The equation of the groove curve in polar coordinates is: In this system, the origin of the polar coordinate system is the intersection of the inner (or outer) circle axis of the flexible sheet and the neutral surface of the flexible sheet, R is the polar radius in the polar coordinate system, k is a coefficient, and θ is the polar angle in the polar coordinate system.

[0015] Each of the radial support structures also includes a glue cup and a glue rod. The glue rod is fixed to the surface of the triangular back plate facing the back of the reflector, the glue cup is fixed to the end of the conical beam away from the movable plate, and the glue rod is inserted into the glue cup. The gap between the glue rod and the glue cup is fixed by glue injection.

[0016] The end of the rubber rod away from the cone beam is an open end, and an injection hole is provided at the bottom of the open end of the rubber rod, extending through to the surface of the rubber rod near the cone beam.

[0017] The reflector has a radius of R0, and the three circular nested holes lie on the same circle with a radius of R1, which is concentric with the reflector. All the adhesive pads form two circles concentric with the reflector, with radii of R2 and R3 respectively. R0, R1, R2, and R3 satisfy the following:

[0018] .

[0019] In summary, this application includes at least the following beneficial technical effects:

[0020] 1. This support structure allows large-aperture mirrors to achieve a good gravitational mirror surface shape when placed at any angle between the mirror's optical axis and the direction of gravity, without requiring an unloading structure. In other words, the direction of gravity is insensitive to the mirror surface shape.

[0021] 2. This support structure sets radial supports on the neutral surface inside the reflector. Compared with setting support structures at the radial edge of the reflector, it requires less design space, is more convenient for support structure design and layout, and reduces the volume and weight of the support structure.

[0022] 3. The distribution of the 18 support points on the back plate of the reflector is conducive to the reflector obtaining a better surface shape under gravity.

[0023] 4. The glue cup and rod injection fixing method is adopted, which allows the stress of radial shrinkage of the glue in the glue cup and rod to cancel each other out, avoiding structural deformation caused by glue shrinkage. This can greatly reduce the impact of assembly stress on the surface shape of large-aperture reflectors.

[0024] 5. The flexible sheet is grooved using the equation given in this patent. The flexible sheet has a relatively large ratio of radial to axial stiffness, which reduces the radial size and weight of the flexible sheet. When there is a size limit in the radial direction of the flexible sheet, it can provide a larger design space for the flexible sheet to move.

[0025] 6. Designing a limiting structure in the normal direction (i.e., axial direction) of the flexible sheet can prevent the flexible sheet from deforming excessively and causing damage during vibration.

[0026] 7. This support structure is a quasi-statically indeterminate support structure. The extensive use of flexible support structures can reduce the impact of assembly stress and external environmental disturbances on the surface shape of the reflector. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure connecting the reflector and the reflector support structure.

[0028] Figure 2 This is a cross-sectional view of the mirror assembly formed after the mirror and the mirror support structure are connected at the location of the circular nested hole;

[0029] Figure 3 A schematic diagram showing one side of the reflector with a circular nested hole;

[0030] Figure 4 This is a front view of the overall structure after the reflector and reflector support structure are connected.

[0031] Figure 5 This is an overall structural diagram of the whiffletree support structure, triangular back plate, and radial support structure.

[0032] Figure 6 for Figure 5 A cross-sectional view through the axis of the flexible sheet;

[0033] Figure 7This is a structural diagram of the whiffletree support structure and radial support structure.

[0034] Figure 8 A cross-sectional view of the whiffletree support structure through the axis of the flexible support rod;

[0035] Figure 9 The diagram shows the structure of a flexible support rod, with the left image being a three-dimensional structural diagram of the flexible support rod and the right image being a cross-sectional view of the flexible support rod through its own axis.

[0036] Figure 10 A schematic diagram of a flexible joint hinge;

[0037] Figure 11 Partial sectional view of the whiffletree support structure

[0038] Figure 12 This is a schematic diagram of the triangular backplate structure;

[0039] Figure 13 This is a schematic diagram showing the relative positions of three radially flexible support structures evenly distributed at 120° radial angles to the reflector.

[0040] Figure 14 This is a cross-sectional view of a radially flexible support structure.

[0041] Figure 15 The diagrams show the structure of the flexible sheet, with the top diagram being a three-dimensional view of the flexible sheet and the bottom diagram being a cross-sectional view of the flexible sheet.

[0042] Figure 16 This is a schematic diagram of the structure of a plastic cup;

[0043] Figure 17 This is a schematic diagram of the rubber rod structure;

[0044] Figure 18 This is a schematic diagram of the reflector's structure;

[0045] Figure 19 This is a schematic diagram of the reflector assembly formed by connecting the reflector and the reflector support structure from different perspectives.

[0046] Illustrations and symbols: 1. Whiffletree support structure; 2. Triangular backplate; 3. Radial support structure;

[0047] 11. Adhesive pad; 12. Flexible support rod; 13. Support rod cup; 14. Triangular support block; 15. Flexible joint hinge; 16. Lever beam; 17. Shaft; 18. Bearing;

[0048] 21. Joint; 22. Composite beam;

[0049] 31. Nesting; 32. Flexible sheet; 33. Limiting block; 34. Movable plate; 35. Conical beam; 36. Glue cup; 37. Glue rod. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0051] This application discloses a large-aperture reflector support structure that adapts to gravitational fields at various angles, such as... Figure 1 and Figure 19 As shown, the technical solution of the support structure in this application is based on the 18-point Whiffletree bottom support method, and on the principle of quasi-statically determinate support, three radial support structures are added on the centroid plane of the reflector.

[0052] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the main support structure consists of three parts: a whiffletree support structure 1, a triangular back plate 2, and three radial support structures 3 mounted on the central plane of the reflector. The whiffletree support structure 1 and the three radial support structures 3 are all fixed to the triangular back plate 2. The triangular back plate 2 is then connected to the external mounting structure.

[0053] like Figure 7 , Figure 8 and Figure 9 As shown, the Whiffletree support structure 1 consists of three identical parts evenly distributed at 120° intervals. Each part includes an adhesive pad 11, a flexible support rod 12, a support rod cup 13, a triangular support block 14, a flexible joint hinge 15, a lever beam 16, a shaft 17, and a bearing 18. Figure 11 As shown. The bonding pad 11 is made of Invar steel and has a central injection hole for bonding to the reflector via adhesive injection. The other side is connected to the flexible support rod 12 by screws. The flexible support rod 12 is fixed to the support rod cup 13 by adhesive injection, and the support rod cup 13 is connected to the triangular support block 14 by screws. Each of the three corners of the triangular support block 14 is connected to a support rod cup 13. A flexible joint hinge 15 is installed at the center of the triangular support block 14, as shown. Figure 10 As shown. The flexible joint hinge 15 is connected by four flexible plates, relative to its own local coordinate system (e.g., Figure 10This allows for the release of rotational degrees of freedom in two directions (Rx and Ry) on the vertical mounting surface. Two triangular support blocks 14 are respectively mounted at both ends of the lever beam 16 via flexible joint hinges 15. A bearing 18 is installed in the middle of the lever beam 16, which transmits the gravitational load of the reflector to the triangular back plate 2 via a shaft 17. That is, the lever beam 16 and the triangular back plate 2 are rotatably connected via the bearing 18 and the shaft 17.

[0054] like Figure 12 As shown, the triangular back plate 2 consists of a joint 21 and a composite beam 22. The joint 21 and the composite beam 22 are bonded together with epoxy adhesive.

[0055] like Figure 13 , Figure 14 and Figure 15 As shown, three radial support structures 3 are distributed at 120° relative to the center of the reflector. Each radial support structure 3 comprises a nest 31, a flexible sheet 32, a limiting block 33, a movable plate 34, a conical beam 35, a glue cup 36, and a glue rod 37. The flexible sheet 32 ​​is a key component, enabling the release of three degrees of freedom: Tz, Rx, and Ry. The flexible sheet 32 ​​reduces its stiffness in the z-direction by cutting grooves. The grooves start from the edge of the flexible sheet 32 ​​and extend towards the center of the flexible sheet 32 ​​in a planar spiral manner. The grooves are evenly distributed around the circumference of the flexible sheet 32. Figure 15 As shown in the upper and lower figures, the nest 31 is bonded to the reflector nesting hole with epoxy adhesive, and the flexible sheet 32 ​​is mounted on the nest 31. The conical beam 35, the flexible sheet 32, and the movable plate 34 are connected together with screws, and the limiting block 33 is mounted on the nest 31. Since the stiffness of the central area of ​​the flexible sheet 32 ​​in the plane normal direction (z-direction) is very small, the conical beam 35 and the movable plate 34 are movable in the z-direction. To prevent excessive displacement, the movable plate 34 is placed between the flexible sheet 32 ​​and the limiting block 33. The edge of the flexible sheet 32 ​​has high stiffness in the z-direction, and the movable plate 34 can be limited in the z-direction by the flexible sheet 32 ​​and the limiting block 33. The lower end of the conical beam 35 is connected to the glue cup 36 with screws, and the glue rod 37 is embedded inside the glue cup 36 with a gap of 2-3 mm between them. The glue rod 37 is connected to the triangular back plate 2 with screws. The end of the adhesive rod 37 furthest from the conical beam 35 is open. A glue injection hole is located at the center of the bottom of this open end, extending to the surface of the adhesive rod 37 near the conical beam 35. After the reflector is positioned correctly, epoxy resin is injected into the gap between the glue cups 36 and 37 through the central injection hole of the adhesive rod 37. The glue cups 36 and 37 are connected without screws; instead, the resin is injected and cured before connection. This method reduces the assembly stress caused by screw connections, allowing the reflector to achieve a better surface shape. Figure 16 and Figure 17 As shown.

[0056] like Figure 18As shown, the radius of the circular reflector is R0, and the circumference of the three circular nested holes on the back of the reflector (bonded to the three radial support structures 3) is R1. The inner six of the 18 support points are located on the circumference of radius R2, and the outer 12 points are evenly distributed on the circumference of radius R3.

[0057] like Figure 3 and Figure 4 As shown, to ensure good surface accuracy of the reflector and to guarantee a reasonable structural layout, the reflector radius R0, and the support point arrangement radii R1, R2, and R3 should satisfy the following relationship:

[0058]

[0059] When the optical axis of the reflector is vertical, under the action of gravity, the whiffletree support structure 1 bears the weight of the reflector. The radial support structure 3 does not bear any load.

[0060] When the optical axis of the reflector is horizontal, under the action of gravity, the whiffletree support structure 1 does not bear the load, while the radial support structure 3 bears the load.

[0061] When the optical axis forms an arbitrary angle θ with gravity, the whiffletree support structure 1 bears the component of gravity along the optical axis, while the three radial support structures 3 bear the radial component of gravity. Both supports function simultaneously, enabling unloading of the reflector when it is placed at any angle.

[0062] The mirror support structure of this application is compact and lightweight, making it easy to achieve both horizontal and vertical gravitational surface shapes. The main features of its support structure are as follows:

[0063] (1) The 18 support points of the whiffletree support structure 1 and the three radial support structures satisfy the following relationship.

[0064]

[0065] (2) The component of gravity along the optical axis is provided with a reaction force by the bottom whiffletree support structure 1, and the component of gravity perpendicular to the optical axis is provided with a reaction force by the three radial support structures 3.

[0066] (3) In the Whiffletree structure, a flexible joint hinge 15 is used between the lever beam 16 and the triangular support block 14. This structure is more equivalent to a real ball joint structure than other structures. The axes of this cross-flexible joint around Rx and around Rx intersect at a point in space. The intersection point is the physical center of the ball joint, which makes it easier to calculate the position of the ball joint center.

[0067] (4) In the Whiffletree support structure 1, the flexible support rod 12 and the triangular support block 14 adopt the support rod glue cup 13 injection structure, which reduces the assembly stress and improves the accuracy of the support surface shape.

[0068] (5) The three confluence points of the bottom whiffletree support structure are connected together by a triangular back plate. At the same time, the three corners of the triangular back plate support structure are connected to three flexible sections supported on the center of mass plane.

[0069] (6) The Whiffletree support structure 1 constrains the reflector's Rx, Ry, and Tz, and the three radial support structures 3 constrain Tx, Ty, and Rz. Among them, Tx, Ty, and Tz refer to the translational degrees of freedom along the X, Y, and Z directions, respectively, and Rx, Ry, and Rz refer to the rotational degrees of freedom around the X, Y, and Z directions, respectively. The Z-axis is the optical axis of the reflector, and the X and Y axes are both perpendicular to the Z-axis and are mutually perpendicular.

[0070] (7) The three radial support structures adopt a leaf spring structure. The neutral plane (the plane of symmetry in the thickness direction) of the flexible sheet 32 ​​passes through the centroid plane of the reflector. It is required that r2-r1≥10t. Figure 15 As shown, where t is the thickness of the flexible portion of the flexible sheet 32, r1 is the inner radius of the flexible sheet 32, and r2 is the outer radius of the flexible sheet 32, the leaf spring is divided by three slots to release the z-axis degree of freedom. The equations of the three slot curves in polar coordinates are as follows (the origin of the polar coordinate system is at the intersection of the axis of the inner (or outer) circle of the flexible sheet 32 ​​and the neutral plane of the flexible sheet):

[0071]

[0072] Within this range, radial flexible joints can achieve a higher ratio of radial stiffness to axial stiffness, increasing the design space of the joint; where R is the polar radius in polar coordinates, k is a coefficient, and θ is the polar angle in polar coordinates.

[0073] (8) The three radial support structures 3 and the triangular back plate 2 are connected by glue injection to avoid screwing, which would cause greater assembly stress due to uneven mounting surfaces. The glue is injected from the middle of the glue rod 37, allowing the glue to flow from the bottom to the axial bonding surface of the glue rod. When glue is almost overflowing from the edges of the glue cup 36, this ensures that the bonding surfaces between the glue cup and the glue rod are evenly coated with glue. At the same time, this structure can control the gap between the glue cup 36 and the glue rod 37, allowing the stress of circumferential shrinkage of the glue to cancel each other out, avoiding structural deformation caused by glue shrinkage.

Claims

1. A large-aperture reflector support structure adaptable to gravitational fields at various angles, connected to the back of the reflector, characterized in that: It includes a triangular back plate (2), three whiffletree support structures (1), three radial support structures (3), three lever beams (16), six triangular support blocks (14), eighteen support rod cups (13), and eighteen flexible support rods (12); Three whiffletree support structures (1) and three radial support structures (3) are respectively connected to the three corners of the triangular back plate (2). The back of the reflector has three circular nesting holes. The ends of the radial support structures (3) facing the reflector are glued to the circular nesting holes. Each whiffletree support structure (1) includes six adhesive pads (11), which are glued to the back of the reflector by injection. Each lever beam (16) is rotatably connected to the triangular back plate (2). The rotation axis of the lever beam (16) is... On the same plane, each lever beam (16) is provided with two triangular support blocks (14). The two triangular support blocks (14) are respectively connected to the two ends of the lever beam (16) facing the surface of the reflector. Each corner of the triangular support block (14) is fixedly connected to a support rod cup (13). The support rod cup (13) has a through hole. The end of the flexible support rod (12) is inserted into the through hole. The through hole and the outside of the flexible support rod (12) are fixed by injection. The adhesive pad (11) is connected to the end of the flexible support rod (12) facing the back of the reflector. The three radial support structures (3) are distributed at 120° relative to the center of the reflector. Each radial support structure (3) includes a nest (31), a flexible sheet (32), a limiting block (33), a movable plate (34), and a conical beam (35). The conical beam (35) is connected to the surface of the triangular back plate (2) facing the back of the reflector, and the movable plate (34) is connected to the end of the conical beam (35) away from the triangular back plate (2). The nest (31) is bonded to the circular nesting hole of the reflector with epoxy adhesive. The inner side of the nest (31) is provided with A limiting ring and a limiting block (33) are connected to the inside of the nest (31), and the limiting block (33) is located on the side of the limiting ring away from the reflecting surface of the mirror. A flexible sheet (32) is installed inside the nest (31). The edge of the flexible sheet (32) has a mounting ring, which is located between the limiting ring and the limiting block (33). A movable plate (34) is located between the flexible sheet (32) and the limiting block (33). The central area of ​​the flexible sheet (32) is deformable in the plane normal direction. The neutral surface of the flexible sheet (32) passes through the centroid plane of the mirror.

2. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 1, wherein: The whiffletree support structure (1) also includes a flexible joint hinge (15). The triangular support block (14) is connected to the lever beam (16) through the flexible joint hinge (15). The flexible joint hinge (15) has two rotation axes, the x-axis and the y-axis, so that the triangular support block (14) and the lever beam (16) can achieve rotational freedom in both directions around the x-axis and around the y-axis.

3. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 1, wherein: The flexible sheet (32) has at least two grooves. The grooves start from the edge of the flexible sheet (32) and extend gradually towards the center of the flexible sheet (32) in a planar spiral manner. The grooves are evenly distributed in the circumferential direction of the flexible sheet (32).

4. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 3, wherein: The thickness of the flexible part of the flexible sheet (32) is t, the inner radius of the flexible sheet (32) is r1, the outer radius of the flexible sheet (32) is r2, and r2-r1≥10t.

5. The large aperture mirror support structure for accommodating various angle gravity fields according to claim 3, wherein, The polar coordinate equation for the curve of the groove in the flexible sheet (32) is: ， The origin of the polar coordinate system is located at the intersection of the inner or outer circle axis of the flexible sheet (32) and the neutral surface of the flexible sheet; R is the polar radius in the polar coordinate system, k is a coefficient, and θ is the polar angle in the polar coordinate system.

6. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 1, wherein: Each of the radial support structures (3) further includes a glue cup (36) and a glue rod (37). The glue rod (37) is fixed to the surface of the triangular back plate (2) facing the back of the reflector. The glue cup (36) is fixed to the end of the conical beam (35) away from the movable plate (34). The glue rod (37) is inserted into the glue cup (36). The gap between the glue rod (37) and the glue cup (36) is fixed by glue injection.

7. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 6, wherein: The end of the rubber rod (37) away from the cone beam (35) is an open end, and an injection hole is provided at the bottom of the open end of the rubber rod (37), which extends to the surface of the rubber rod (37) near the cone beam (35).

8. The large aperture mirror support structure for accommodating multiple angle gravity field according to claim 1, wherein: The radius of the reflector is R0, and the three circular nested holes are on the same circle with radius R1, which is concentric with the reflector; all the adhesive pads (11) form two circles concentric with the reflector, with radii of R2 and R3 respectively, and R0, R1, R2 and R3 satisfying: 。

Images