A hinged statically determinate support device for medium and large aperture mirrors

Abstract

This invention provides a hinged statically determinate support device for medium-to-large aperture reflectors, comprising three sets of hinged support shaft assemblies and a support back plate. Each set of hinged support shaft assemblies consists of a hinge shaft I, a hinge shaft II, a cross coupling seat, and a mounting base. Hinge shaft I and hinge shaft II pass through the cross coupling seat, and their axes are orthogonal. The two ends of hinge shaft I are installed inside the reflector bushing, while hinge shaft II is not connected to the back of the reflector. The structural design of the cross coupling seat and the mounting base allows the mounting base to translate along hinge shaft I and rotate around hinge shaft I and around hinge shaft II within a limited range. By connecting the reflector to the support back plate through the three sets of hinged support shaft assemblies, the reflector can be statically mounted on the support back plate, effectively overcoming the influence of temperature changes, assembly stress, and structural deformation on the reflector surface shape. Furthermore, the assembly process of the reflector assembly is simple and flexible, and it can be widely applied to stress-free support of medium-to-large aperture (approximately 400~1200mm) space reflectors.

Description

Technical Field

[0001] This invention belongs to the field of space optical remote sensing technology, and specifically relates to a hinged statically determinate support device for medium and large aperture mirrors. Background Technology

[0002] The support system for medium and large aperture space mirrors is one of the key technologies in high-precision space optical remote sensors. Its design directly affects the surface accuracy and stability of the mirror, as well as the imaging quality of the optical system. Space mirrors are assembled and adjusted in a ground-based laboratory environment. Factors such as forced deformation during assembly, structural deformation caused by changes in internal stress distribution throughout the lifespan, and thermal coupling deformation due to temperature fluctuations all affect the mirror's surface shape, position, and angle, further leading to system optical performance mismatch.

[0003] Currently, large-aperture high-precision space mirrors often employ flexible support structures or multi-point support structures. These can be used individually or simultaneously. Flexible support structures are widely used in large-aperture mirrors, utilizing flexible elements to unload thermal and mechanical stress deformation, thus mitigating the impact of thermal and forced deformation on the mirror. Multi-point support structures, such as the classic Whiffletee support structure with 6, 9, and 18 points and their extensions, provide distributed, uniform passive support for the mirror's gravity, reducing assembly stress while ensuring good mechanical properties. However, in flexible support methods, achieving both unloading capacity and structural stiffness is difficult, making design and optimization complex, and increasing the fundamental frequency of the mirror assembly is challenging. Furthermore, multi-point support methods involve complex mirror assembly design and assembly processes, and the inconsistent thermal expansion coefficients of materials can easily lead to mirror deformation when temperatures change. Summary of the Invention

[0004] To overcome the shortcomings of the existing technology, the inventors have conducted intensive research and provided a high-precision kinematic statically determinate support structure for medium and large aperture space mirrors. Through a three-degree-of-freedom structural design, the influence of temperature changes, assembly stress, and structural deformation on the surface shape of the mirror can be effectively overcome. Moreover, the mirror assembly process is simple and flexible, and it can be widely extended to the stress-free support of medium and large aperture (approximately 400~1200mm) space mirrors.

[0005] The technical solution provided by this invention is as follows:

[0006] A hinged statically determinate support device for medium and large diameter reflectors includes three sets of hinged support shaft assemblies and a support back plate installed on the back of the reflector.

[0007] The back of the reflector has three sets of bushing mounting holes. Each set of bushing mounting holes consists of two coaxial through holes. The line connecting the two coaxial through holes is in the radial or tangential direction of the reflector. One bushing is installed in each through hole as the external interface of the reflector.

[0008] Each set of hinged support shaft assemblies includes hinge shaft I, hinge shaft II, cross coupling seat, mounting base and retaining ring;

[0009] Hinged shaft I and hinged shaft II pass through the cross coupling seat, and their axes are orthogonal; both ends of hinged shaft I are installed in the bushing, and hinged shaft II is not connected to the back of the reflector; hinged shaft I and hinged shaft II are arranged, one along the radial direction of the reflector and the other along the tangential direction of the reflector.

[0010] The mounting base includes a cross-coupling mounting section and a support back plate mounting section. The cross-coupling mounting section limits the movement of the cross-coupling and includes a base plate and a side plate. The side plate has a clearance structure that allows hinge shaft I to pass through and a channel that allows hinge shaft II to pass through and is clearance-fitted with it. One end of the support back plate mounting section is fixedly connected to the base plate of the cross-coupling mounting section, and the other end passes through the support back plate and is fixedly connected to the rear surface of the support back plate. The entire reflector is mounted on the upper-level structure via the support back plate.

[0011] The cross coupling seat is clearance-fitted with hinge shaft I, allowing the cross coupling seat and the mounting seat to translate along and rotate around hinge shaft I within a limited range; the inner cavity of the mounting section of the cross coupling seat is clearance-fitted with the outer wall of the cross coupling seat. This structural design allows the mounting seat to rotate around hinge shaft II, while the mounting seat cannot translate relative to the cross coupling seat along the axis of hinge shaft II.

[0012] The hinged statically determinate support device for medium and large aperture reflectors provided by the present invention has the following beneficial effects:

[0013] This invention provides a hinged statically determinate support device for medium-to-large aperture reflectors, comprising three sets of hinged support shaft assemblies and a support back plate. Each set of hinged support shaft assemblies includes a hinge shaft I, a hinge shaft II, a cross coupling seat, and a mounting base. Hinge shaft I and hinge shaft II pass through the cross coupling seat, and their axes are orthogonal. The two ends of hinge shaft I are installed in the mounting holes of the reflector bushing, while hinge shaft II is not connected to the back of the reflector. The structural design of the cross coupling seat and the mounting base allows the mounting base to translate along hinge shaft I and rotate around hinge shaft I and around hinge shaft II within a limited range. By connecting the reflector to the support back plate through the three sets of hinged support shaft assemblies, the reflector can be statically mounted on the support back plate (the reflector has 0 degrees of freedom relative to the support back plate). This effectively overcomes the influence of temperature changes, assembly stress, and structural deformation on the reflector surface shape. Furthermore, the assembly process of the reflector assembly is simple and flexible, and it can be widely applied to stress-free support of medium-to-large aperture (approximately 400~1200mm) space reflectors. Attached Figure Description

[0014] Figure 1 This is an overall configuration diagram of the articulated statically determinate reflector assembly;

[0015] Figure 2 This is a configuration diagram of the hinged support shaft assembly;

[0016] Figure 3 This is a sectional view of the hinged support shaft assembly along hinge axis I;

[0017] Figure 4 This is a sectional view of the hinged support shaft assembly along hinge axis II;

[0018] Figure 5 This is a schematic diagram of the staggered orthogonal hinge axis I and hinge axis II. Detailed Implementation

[0019] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0020] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0021] This invention provides a hinged statically determinate support device for medium and large aperture reflectors, such as... Figure 1 As shown, it includes three sets of hinged support shaft assemblies and a support back plate mounted on the back of the reflector;

[0022] The back of the reflector has three sets of bushing mounting holes. Each set consists of two coaxial through holes, with the line connecting the two through holes running radially or tangentially along the reflector. One bushing is installed in each through hole, serving as the external interface of the reflector. The bushing material and the reflector material need to be thermally compatible.

[0023] like Figure 2 As shown, each set of hinged support shaft assemblies includes hinge shaft I, hinge shaft II, cross coupling seat, mounting seat and retaining ring;

[0024] Hinged shaft I and hinged shaft II pass through the cross coupling seat, and their axes are orthogonal; both ends of hinged shaft I are installed in the bushing, and hinged shaft II is not connected to the back of the reflector; hinged shaft I and hinged shaft II are arranged, one along the radial direction of the reflector and the other along the tangential direction of the reflector.

[0025] The mounting base includes a cross-coupling mounting section and a support back plate mounting section. The cross-coupling mounting section limits the movement of the cross-coupling and includes a base plate and a side plate. The side plate has a clearance structure that allows hinge shaft I to pass through and a channel that allows hinge shaft II to pass through and is clearance-fitted with it. One end of the support back plate mounting section is fixedly connected to the base plate of the cross-coupling mounting section, and the other end passes through the support back plate and is fixedly connected to the rear surface of the support back plate. The entire reflector assembly is mounted on the upper-level structure via the support back plate.

[0026] The cross coupling seat is clearance-fitted with hinge shaft I, allowing the cross coupling seat and the mounting seat to translate along and rotate around hinge shaft I within a limited range; the inner cavity of the mounting section of the cross coupling seat is clearance-fitted with the outer wall of the cross coupling seat. This structural design allows the mounting seat to rotate around hinge shaft II, while the mounting seat cannot translate relative to the cross coupling seat along the axis of hinge shaft II.

[0027] Retaining rings are fitted at both ends of hinge shaft I to limit the axial relative position of hinge shaft I and bushing; retaining rings are fitted at both ends of hinge shaft II to limit the axial relative position of hinge shaft II and mounting base.

[0028] Figure 3 and Figure 4 The diagram illustrates the fit between a cross-shaped coupling seat and hinge shaft I / hinged shaft II. The cross-shaped coupling seat has orthogonal and interconnected channels for hinge shaft I and hinge shaft II. The diameter of hinge shaft II is larger than the diameter of hinge shaft I. Hinge shaft II passes through the hinge shaft II channel and the two form a clearance fit. Hinge shaft I passes through the hinge shaft I channel and hinge shaft II. Hinge shaft I forms a clearance fit with the hinge shaft I channel, and hinge shaft I and hinge shaft II do not contact each other.

[0029] Figure 5 The diagram shows a staggered orthogonal hinge shaft I and hinge shaft II. The cross coupling seat has orthogonal and staggered hinge shaft I channels and hinge shaft II channels. Hinge shaft I passes through hinge shaft I channel and forms a clearance fit with hinge shaft I channel; hinge shaft II passes through hinge shaft II channel and forms a clearance fit with hinge shaft II channel.

[0030] The support backplate is a regular polygonal backplate structure, a circular backplate structure, or an irregular structure, and is fixedly connected to the hinged support shaft assembly to achieve static determinacy of the overall structure and transfer of the reflector.

[0031] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0032] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A hinged statically determinate support device for medium and large aperture reflectors, characterized in that, Includes three sets of hinged support shaft assemblies and a support backplate mounted on the back of the reflector; The back of the reflector has three sets of bushing mounting holes. Each set of bushing mounting holes consists of two coaxial through holes. The line connecting the two coaxial through holes is in the radial or tangential direction of the reflector. One bushing is installed in each through hole as the external interface of the reflector. Each set of hinged support shaft assemblies includes hinge shaft I, hinge shaft II, cross coupling seat, mounting base and retaining ring; Hinged shaft I and hinged shaft II pass through the cross coupling seat, and their axes are orthogonal; both ends of hinged shaft I are installed in the bushing, and hinged shaft II is not connected to the back of the reflector; hinged shaft I and hinged shaft II are arranged, one along the radial direction of the reflector and the other along the tangential direction of the reflector. The mounting base includes a cross-coupling mounting section and a support back plate mounting section; the cross-coupling mounting section limits the cross-coupling and includes a base plate and a side plate, with a clearance structure on the side plate allowing hinge shaft I to pass through and a channel for hinge shaft II to pass through and be clearance-fitted with it; One end of the support back plate mounting section is fixedly connected to the base plate of the cross coupling mounting section, and the other end passes through the support back plate and is fixedly connected to the rear surface of the support back plate. The entire reflector is mounted on the upper-level structure via the support back plate. The cross coupling seat is clearance-fitted with hinge shaft I, allowing the cross coupling seat and the mounting seat to translate along and rotate around hinge shaft I within a limited range; the inner cavity of the mounting section of the cross coupling seat is clearance-fitted with the outer wall of the cross coupling seat. This structural design allows the mounting seat to rotate around hinge shaft II, while the mounting seat cannot translate relative to the cross coupling seat along the axis of hinge shaft II.

2. The hinged statically determinate support device for medium and large aperture mirrors according to claim 1, characterized in that, The cross coupling seat has orthogonal and interconnected hinge shaft I channel and hinge shaft II channel. The diameter of hinge shaft II is larger than the diameter of hinge shaft I. Hinged shaft II passes through the hinge shaft II channel and the two form a clearance fit. Hinged shaft I passes through hinged shaft I channel and hinged shaft II. Hinged shaft I and hinged shaft I channel form a clearance fit, and hinged shaft I and hinged shaft II do not contact each other.

3. The hinged statically determinate support device for medium and large aperture mirrors according to claim 1, characterized in that, The cross-shaped coupling seat has orthogonal and staggered hinge shaft I channels and hinge shaft II channels. Hinged shaft I passes through hinge shaft I channel and forms a clearance fit with hinge shaft I channel; hinge shaft II passes through hinge shaft II channel and forms a clearance fit with hinge shaft II channel.

4. The hinged statically determinate support device for medium and large aperture mirrors according to claim 1, characterized in that, Retaining rings are fitted at both ends of hinge shaft I to limit the axial relative position of hinge shaft I and bushing; retaining rings are fitted at both ends of hinge shaft II to limit the axial relative position of hinge shaft II and mounting base.

5. The hinged statically determinate support device for medium and large aperture mirrors according to claim 1, characterized in that, The supporting back plate is a regular polygonal back plate structure, a circular back plate structure, or an irregular structure, and is fixedly connected to the hinged supporting shaft assembly to achieve static stability of the overall structure and transfer of the reflector.

6. The hinged statically determinate support device for medium and large aperture mirrors according to claim 1, characterized in that, The material of the bushing is thermally compatible with the material of the reflector.

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