A central support structure for a reflector

Abstract

The invention discloses a central support structure of a reflector, belonging to the field of space optical remote sensing technology. The invention comprises a core shaft that can be placed in the central hole of a reflector body, and a substrate that is detachably connected to the core shaft; wherein the core shaft comprises a flange and a flexible support portion circumferentially formed on the outer side of the flange, a protrusion that can extend into the central hole is formed in the middle of the substrate, and is used for being detachably connected to the flange so as to support the core shaft to be consistent with the center of mass of the reflector body. The invention has the beneficial effects of high positioning accuracy among the reflector body, the core shaft and the substrate, and high surface shape accuracy of the reflector surface.

Description

Technical Field

[0001] The invention relates to the technical field of space optical remote sensing, and in particular to a central supporting structure of a reflector. Background Art

[0002] The optical reflector is the core component of the space optical remote sensor. Its support method and installation accuracy will directly affect the surface accuracy of the reflector, thereby affecting the imaging quality of the optical system. Therefore, the reasonable design of the support structure of the reflector will be crucial. When working in the space environment, the complex thermal and mechanical environment will cause temperature changes in the structure of the space optical remote sensor reflector assembly and deformation of the corresponding connecting components, which will cause the surface shape of the optical reflector to be out of tolerance and lead to degradation of the imaging quality of the optical system. Therefore, it is necessary to make the support structure of the space optical remote sensor reflector have good rigidity and temperature adaptability, so as to reduce the impact of changes in the external environment on the surface shape. This requires the provision of a new flexible support structure for the space optical remote sensor reflector with high rigidity, good environmental adaptability and easy assembly.

[0003] At present, most space mirrors use flexible structures to improve the adaptability of mirror components to temperature and complex mechanical environments. China's published invention patent "Space Camera Mirror Center Support Device". Figure 1 As shown, the central support device includes a reflector 1 and a flexible support structure 2, wherein the flexible support structure 2 includes a support structure and three flexible structures uniformly distributed at 120° along the circumference of the support structure, and a core shaft and an upper bottom surface boss, a glue injection groove and a glue overflow groove are provided on the support structure. The outer ring of the core shaft and the inner ring of the reflector are glued together for support. The disadvantages of this central support are: the bonding surface is too large, which will bring about a large bonding stress, making the surface shape of the reflector worse, and the adhesive may be unevenly applied and volatilized in space; the stress difference between the reflector and the main load-bearing structure of the space optical remote sensor will cause spherical aberration at the center of the reflector; the structural form positioned on the core shaft of the flexible support structure has a polarity problem in the cross direction, which affects the surface accuracy of the reflector. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a central support structure for a reflector, which can solve the problem of central support of a reflector for a space optical remote sensor, eliminate the influence of the polarity problem in the cross direction of the structural form of the reflector core axis on the surface accuracy of the reflector, improve temperature adaptability, and reduce the influence of the positioning accuracy of the traditional support structure on the imaging quality.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention discloses a reflector central support structure, comprising:

[0007] A core shaft that can be placed in the center hole of the reflector body, and a base plate that is detachably connected to the core shaft;

[0008] Among them, the core shaft includes a flange and a flexible support portion circumferentially formed on the outside of the flange, and a protrusion that can extend into the center hole is formed in the middle of the substrate for detachable connection with the flange so as to support the core shaft to remain consistent with the center of mass of the reflector body.

[0009] Furthermore, the raised portion is integrally formed with the base plate, and the raised portion has a cone sleeve section extending obliquely upward and a shaft sleeve section formed at the top of the cone sleeve section and having a cylindrical structure, and a bearing surface is formed at the top of the shaft sleeve section for contacting the flange.

[0010] Furthermore, an extension section overlapping the flange is formed at the top end of the shaft sleeve section, and an outer wall of the extension section cooperates with an inner hole of the flange to make the shaft sleeve section coaxial with the core shaft.

[0011] Furthermore, the outer wall of the flexible support portion is a cylindrical surface, and the upper surface and the lower surface of the flexible support portion both protrude from the surface of the flange.

[0012] Furthermore, the flexible support portion includes inner flexible grooves and outer flexible grooves that are evenly distributed in a circumference, and the inner flexible grooves and the outer flexible grooves are staggered, and the groove wall thickness between two adjacent inner flexible grooves is greater than the groove wall thickness between two adjacent outer flexible grooves.

[0013] Furthermore, the flexible support portion is located in the middle of the outer wall of the flange corresponding to the inner flexible groove, and its height is not greater than the height of the flange. The height of the flexible support portion is greater than the height of the flange corresponding to the outer flexible groove, and both ends extend in a symmetrical form.

[0014] Furthermore, the outer wall of the flexible support portion is circumferentially provided with vertical grooves whose number matches the number of the outer flexible grooves, the vertical grooves extend from one end of the flexible support portion to the other end, and the vertical grooves are connected to the outer flexible grooves.

[0015] Furthermore, the central hole is a blind hole, and the blind hole includes a tapered hole section and a round hole section formed at the end of the tapered hole section, and the round hole section is fixedly connected to the flexible support portion in a glued form.

[0016] Furthermore, an outer side wall extending downward is formed circumferentially at the edge of the substrate, an inner side wall extending downward is formed at the lower surface of the substrate corresponding to the raised portion, and a rib plate is connected between the inner side wall and the outer side wall.

[0017] Furthermore, the base plate is provided with a process hole between two adjacent rib plates for weight reduction.

[0018] In the above technical solution, the present invention provides a reflector central support structure, which has the following beneficial effects:

[0019] Beneficial effects;

[0020] 1) The present invention discloses a reflector support structure, which uses a core shaft as a main component for eliminating stress, and bolts as main fastening and positioning components when assembling the core shaft and the base plate, so as to ensure that the core shaft, the reflector body and the base plate are accurately positioned during installation;

[0021] 2) The substrate designed in the present invention supports the core shaft through a protrusion so that the center of mass of the core shaft and the reflector body are consistent. The flexible support part of the core shaft is formed with an inner flexible groove and an outer flexible groove. The inner flexible groove and the outer flexible groove are evenly distributed along the circumference of the core shaft, and the inner flexible groove and the outer flexible groove are staggered. The outer flexible groove is provided with a vertical groove away from the inner flexible groove. When external load is applied and stress is generated, the inner and outer circles of the flexible grooves are deformed to absorb strain energy and prevent stress from being transmitted to the reflector body, thereby ensuring the surface accuracy of the mirror, reducing the stress concentration of the reflector under the action of gravity, and ensuring that the surface accuracy of the reflector does not exceed the tolerance value of the optical design.

[0022] 3) The core shaft designed in the present invention forms a complete kinematic constraint on the reflector body without introducing over-constraint, thereby achieving precise installation and positioning of the reflector body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of a center support device of a space camera reflector in the prior art;

[0025] Figure 2 It is an axonometric diagram of the assembly state of a reflector central support structure and a reflector body disclosed in the present invention;

[0026] Figure 3 It is an exploded view of the assembly state of a reflector central support structure and a reflector body disclosed in the present invention;

[0027] Figure 4 It is a front full cross-sectional view of the assembly state of a reflector central support structure and a reflector body disclosed in the present invention;

[0028] Figure 5 It is a front full cross-sectional view of a reflector central support structure disclosed in the present invention;

[0029] Figure 6 It is a top view of a core shaft of a central support structure of a reflector disclosed in the present invention;

[0030] Figure 7 It is an axonometric view of a core shaft of a central support structure of a reflector disclosed in the present invention.

[0031] Description of reference numerals:

[0032] 10. Reflector body; 11. Conical hole section; 12. Circular hole section;

[0033] 20, mandrel; 21, flange; 22, flexible support portion; 221, inner flexible groove; 222, outer flexible groove; 223, vertical groove;

[0034] 30. Base plate; 31. Raised portion; 311. Cone sleeve section; 312. Shaft sleeve section; 313. Bearing surface; 314. Extension section; 32. Inner wall; 33. Outer wall; 34. Rib plate; 35. Bolt. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Figure 2 An axonometric view of the assembly state of the reflector center support structure and the reflector body;

[0037] A central support structure of a reflector is invented, which includes a core shaft 20 that can be placed in a central hole of a reflector body 10, and a base plate 30 that is detachably connected to the core shaft 20;

[0038] Among them, the core shaft 20 includes a flange 21 and a flexible support portion 22 formed circumferentially on the outside of the flange 21, and a protrusion 31 that can extend into the center hole is formed in the middle of the base plate 30, which is used to be detachably connected to the flange 21 so as to support the core shaft 20 to maintain consistency with the center of mass of the reflector body 10.

[0039] Specifically, the core shaft 20 and the base plate 30 of the support structure are split structures, thereby reducing the overall volume of the core shaft 20, so that the core shaft 20 can be placed in the center hole of the reflector body 10 and fixedly connected to the reflector body 10 through a hinge process. A protrusion 31 is formed on the upper surface of the base plate 30, and the top of the protrusion 31 is detachably connected to the core shaft 20 by a bolt 35. In this structure, the core shaft 20 is supported by invading the center hole of the reflector body 10 through the protrusion 31, so as to ensure that the center of mass of the core shaft 20 and the reflector body 10 are consistent, and the core shaft 20 provides radial flexibility of the reflector to compensate for the thermal deformation difference between the reflector and the main load-bearing structure of the camera. Furthermore, the support structure solves the problem of central support of the space optical remote sensor reflector, eliminates the influence of the polarity problem in the cross direction of the structural form of the reflector core shaft on the surface accuracy of the reflector, improves temperature adaptability, and reduces the influence of the positioning accuracy of the traditional support structure on the imaging quality.

[0040] In a more specific embodiment, the reflector body 10 is made of SiC material, and the secondary mirror is circular with a small diameter. The core shaft 20 is made of Invar (4J36) material, and the substrate 30 is made of TC4 material. The core shaft 20 adopts a flexible structure to provide radial flexibility of the reflector and to compensate for the difference in thermal deformation between the reflector and the main load-bearing structure of the camera. The optical spacing along the optical axis and the tilt around the X and Y directions are adjusted by grinding the reflector adjustment pad. In this structure, the reflector weighs 1.2 kg and the entire assembly weighs 2.4 kg.

[0041] The height of the mandrel 20 is 16 mm. The center hole of the reflector body 10 and the mandrel 20 are bonded with GHJ-01 (Z) optical epoxy adhesive, and its tensile bonding strength is greater than 10 MPa. The area of ​​the connecting surface between the mandrel 20 and the reflector body 10 is 3244.8 mm2. The following calculation ensures that the reflector body 10 and the mandrel 20 have sufficient bonding strength:

[0042] Glue relay force Fglue = 0.0032m2*107Pa = 32000N;

[0043] The gravity of the reflector G = 1.2kg*9.8N / kg = 11.76N;

[0044] F glue >> G;

[0045] Figure 3 It is an exploded view of the assembly state of the reflector center support structure and the reflector body;

[0046] Figure 4 It is a front full cross-sectional view of the assembly state of the reflector central support structure and the reflector body;

[0047] Preferably, the protrusion 31 is integrally formed with the base plate 30, and the protrusion 31 comprises a cone sleeve section 311 extending obliquely upward and a shaft sleeve section 312 formed at the top of the cone sleeve section 311 and having a cylindrical structure;

[0048] A bearing surface 313 is formed at the top of the sleeve section 312 for contacting the flange 21 .

[0049] For details, see Figure 3 As shown, the structure of the substrate 30 in this structure is a triangular structure, see Figure 4 As shown, a protrusion 31 is integrally formed on the upper surface of the substrate 30, and the protrusion 31 includes a cone sleeve section 311 and a shaft sleeve section 312. The shaft sleeve section 312 is a cylindrical structure. The top of the cone sleeve section 311 is connected to the shaft sleeve section 312, and the bottom is connected to the body of the substrate 30. The top diameter of the cone sleeve section 311 is smaller than the bottom diameter, which serves the purpose of transitionally connecting the shaft sleeve section 312 and the body of the substrate 30. In this structure, the cone sleeve section 311 can effectively avoid interference between the core shaft 20 and the base 30, and at the same time, it can also ensure the connection strength between the root of the protrusion 31 and the body of the substrate 30, avoid stress concentration, and effectively improve the service life of the substrate 30.

[0050] A bearing surface 313 is formed at the top of the sleeve section 312, and the bearing surface 313 supports the flange 21 and is detachably connected to the flange 21 through 6 bolts 35. The flange 21 is provided with a threaded hole, and the sleeve section 312 is provided with a through hole through which the bolt 35 can pass. The bolt 35 passes through the through hole and is threadedly connected to the threaded hole of the flange 21.

[0051] Figure 5 It is a front view of the full cross-section of the central support structure of the reflector;

[0052] Preferably, an extension section 314 overlapped with the flange 21 is formed at the top of the sleeve section 312, and the outer wall of the extension section 314 cooperates with the inner hole of the flange 21. The structure realizes the coaxiality of the sleeve section 312 and the core shaft 20 through the extension section 314 to ensure the accuracy of installation and positioning. Preferably, the outer wall of the extension section 314 and the inner hole of the flange 21 have a clearance fit of H7 / g6 of the basic hole system;

[0053] See also Figure 4 , 5 As shown;

[0054] Preferably, the outer wall of the flexible support portion 22 is a cylindrical surface, and the upper surface and the lower surface of the flexible support portion 22 both protrude from the surface of the flange 21 .

[0055] Specifically, in the structure, the core shaft 20 includes a flange 21 and a flexible support portion 22, the flexible support portion 22 is integrally formed outside the flange 21, and the outer wall of the flexible support portion 22 is arranged parallel to the axis of the core shaft 20, that is, the core shaft 20 is a cylindrical structure, the outer wall of the flexible support portion 22 is a cylindrical surface structure, the outer wall of the flexible support portion 22 is glued to the center hole of the reflector body 10, and the upper and lower surfaces of the flexible support portion 22 are protruding from the surface of the flange 21 to increase the bonding area between the core shaft 20 and the reflector body 1, and at the same time, the flange 21 is recessed inside the flexible support portion 22, thereby avoiding contact between the flange 21 and the reflector body 1;

[0056] Figure 6 A top view of the core shaft of the central support structure of the reflector;

[0057] Figure 7 It is an axonometric view of the core shaft of the central support structure of the reflector;

[0058] Preferably, the flexible support portion 22 includes inner flexible grooves 221 and outer flexible grooves 222 that are evenly distributed around the circumference, and the inner flexible grooves 221 and the outer flexible grooves 222 are staggered, and the groove wall thickness between two adjacent inner flexible grooves 221 is greater than the groove wall thickness between two adjacent outer flexible grooves 222 .

[0059] For details, see Figure 6 As shown, the outer circumference of the flange 21 of the core shaft 20 is sequentially formed with an inner flexible groove 221 and an outer flexible groove 222, the inner flexible groove 221 and the outer flexible groove 222 constitute the flexible support portion 22 of the core shaft 20, and the core shaft 20 provides flexibility through the flexible support portion 22. In a more specific embodiment, the inner flexible groove 221 and the outer flexible groove 222 each include 12 locations, and the inner flexible groove 221 and the outer flexible groove 222 are arranged alternately, that is, the axis formed by the inner flexible groove 221 and the center of the flange 21 and the axis formed by the outer flexible groove 222 and the center of the flange 21 do not coincide. In order to ensure better force transmission, the groove wall thickness between two adjacent inner flexible grooves 221 is greater than the groove wall thickness between two adjacent outer flexible grooves 222, wherein, see Figure 6 As shown, the width of the inner flexible groove 221 and the outer flexible groove 222 along the circumferential direction of the flange 21 is greater than the width along the radial direction of the flange 21, that is, the two circles of flexible grooves are flat structures along the radial direction of the flange, which can better compensate for the stress difference between the reflector and the main load-bearing structure of the camera, eliminate the polarity of the reflector assembly in the cross direction (that is, avoid the reflector from changing significantly after rotating 90°), and avoid spherical aberration at the center of the reflector. And the core shaft 20 cooperates with the substrate 30, and after the external mechanism is installed, it can greatly eliminate the force acting on it, and avoid the stress transmission to the external mechanism through the deformation of the inner flexible groove 221 and the outer flexible groove 222 of the core shaft 20, effectively improving the service life of the external structure.

[0060] See also Figure 7 As shown;

[0061] In a preferred embodiment, the position of the flexible support portion 22 corresponding to the inner flexible groove 221 is located in the middle of the outer wall of the flange 21, and the height is no greater than the height of the flange 21. The height of the flexible support portion 22 corresponding to the outer flexible groove 222 is greater than the height of the flange 21, and the two ends extend in a symmetrical form.

[0062] For details, see Figure 5 As shown, in order for the core shaft 20 to provide better flexibility, the core shaft 20 is symmetrical in structure along the neutral plane, an inner flexible groove 221 is processed in the middle of the outer wall of the flange 21, and the wall thickness of the flexible support portion 22 corresponding to the inner flexible groove 221 is less than the thickness of the flange 21, and the flexible support portion 22 is located outside the inner flexible groove 221 to form an outer flexible groove 222, and the outer flexible groove 222 is symmetrically extended with the inner flexible groove 221 as the center, thereby expanding the contact area between the flexible support portion 22 and the reflector body 1;

[0063] In a preferred embodiment, the outer wall of the flexible support portion 22 is provided with vertical grooves 223 in a circumferential direction, the number of which matches the number of the outer flexible grooves 222. The vertical grooves 223 extend from one end of the flexible support portion 22 to the other end, and the vertical grooves 223 are connected to the outer flexible grooves 222. When stress is generated by an external load, the inner and outer flexible grooves deform to absorb strain energy and prevent stress from being transmitted to the reflector body 1, thereby ensuring the surface accuracy of the mirror, reducing the stress concentration of the reflector under the action of gravity, and effectively ensuring that the surface accuracy of the reflector does not exceed the tolerance value of the optical design.

[0064] See also Figure 4 As shown;

[0065] In a preferred embodiment, the central hole of the reflector body 1 is a blind hole, which includes a tapered hole section 11 and a circular hole section 12 formed at the end of the tapered hole section 11, and the circular hole section 12 is fixedly connected to the outer wall of the flexible support portion 22 by gluing.

[0066] See also Figure 3 , 4 As shown;

[0067] In order to improve the overall strength of the substrate 30, preferably, an outer side wall 33 extending downward is formed circumferentially at the edge of the substrate 30, and an inner side wall 32 extending downward is formed at the position of the lower surface of the substrate 30 corresponding to the protrusion 31, and a rib plate 34 is connected between the inner side wall 32 and the outer side wall 33. Preferably, a process hole is opened between two adjacent rib plates 34 in the substrate 30, and the weight of the substrate 30 is reduced by the process hole.

[0068] In the above technical solution, the present invention provides a reflector central support structure;

[0069] Beneficial effects;

[0070] 1) The present invention discloses a reflector support structure, which uses a core shaft as a main component for eliminating stress, and bolts as main fastening and positioning components when assembling the core shaft and the base plate, so as to ensure that the core shaft, the reflector body and the base plate are accurately positioned during installation;

[0071] 2) The substrate designed in the present invention supports the core shaft through a protrusion so that the center of mass of the core shaft and the reflector body are consistent. The flexible support part of the core shaft is formed with an inner flexible groove and an outer flexible groove. The inner flexible groove and the outer flexible groove are evenly distributed along the circumference of the core shaft, and the inner flexible groove and the outer flexible groove are staggered. The outer flexible groove is provided with a vertical groove away from the inner flexible groove. When external load is applied and stress is generated, the inner and outer circles of the flexible grooves are deformed to absorb strain energy and prevent stress from being transmitted to the reflector body, thereby ensuring the surface accuracy of the mirror, reducing the stress concentration of the reflector under the action of gravity, and ensuring that the surface accuracy of the reflector does not exceed the tolerance value of the optical design.

[0072] 3) The core shaft designed in the present invention forms a complete kinematic constraint on the reflector body without introducing over-constraint, thereby achieving precise installation and positioning of the reflector body.

[0073] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A reflector central support structure, characterized in that: include: A core shaft (20) that can be placed in a central hole of a reflector body (10), and a base plate (30) that is detachably connected to the core shaft (20); The core shaft (20) comprises a flange (21) and a flexible support portion (22) formed circumferentially on the outer side of the flange (21); a protrusion (31) capable of extending into the central hole is formed in the middle of the base plate (30) and is used for being detachably connected to the flange (21) so as to support the core shaft (20) to keep the center of mass of the reflector body (10) consistent; The outer wall of the flexible support portion (22) is a cylindrical surface, and the upper surface and the lower surface of the flexible support portion (22) are both protruding from the surface of the flange (21); The flexible support portion (22) comprises inner flexible grooves (221) and outer flexible grooves (222) that are evenly distributed in a circumference, and the inner flexible grooves (221) and the outer flexible grooves (222) are staggered, and the groove wall thickness between two adjacent inner flexible grooves (221) is greater than the groove wall thickness between two adjacent outer flexible grooves (222).

2. A reflector central support structure according to claim 1, It is characterized by: The protrusion (31) and the base plate (30) are integrally formed; The protruding portion (31) comprises a cone sleeve section (311) extending obliquely upward and a shaft sleeve section (312) formed at the top end of the cone sleeve section (311) and having a cylindrical structure; A bearing surface (313) is formed at the top end of the shaft sleeve section (312) for contacting the flange (21).

3. A reflector central support structure according to claim 2, characterized in that ； An extension section (314) overlapping the flange (21) is formed at the top end of the shaft sleeve section (312), and the outer wall of the extension section (314) cooperates with the inner hole of the flange (21) so that the shaft sleeve section (312) and the core shaft (20) are coaxial.

4. A reflector central support structure according to claim 1, It is characterized by: The position of the flexible support portion (22) corresponding to the inner flexible groove (221) is located in the middle of the outer wall of the flange (21), and its height is not greater than the height of the flange (21); the height of the flexible support portion (22) corresponding to the outer flexible groove (222) is greater than the height of the flange (21), and both ends extend in a symmetrical manner.

5. A reflector central support structure according to claim 1, It is characterized by: The outer wall of the flexible support portion (22) is provided with vertical grooves (223) in a circumferential direction, the number of which matches the number of the outer flexible grooves (222); the vertical grooves (223) extend from one end of the flexible support portion (22) to the other end, and the vertical grooves (223) are connected to the outer flexible grooves (222).

6. A reflector central support structure according to claim 1, characterized in that ； The central hole is a blind hole, comprising a tapered hole section (11) and a round hole section (12) formed at the end of the tapered hole section (11), and the round hole section (12) is fixedly connected to the flexible support portion (22) in the form of adhesive bonding.

7. A reflector central support structure according to claim 1 or 2, characterized in that ； An outer side wall (33) extending downward is formed circumferentially at the edge of the base plate (30), an inner side wall (32) extending downward is formed at a position corresponding to the raised portion (31) on the lower surface of the base plate (30), and a rib plate (34) is connected between the inner side wall (32) and the outer side wall (33).

8. A reflector central support structure according to claim 7, characterized in that ； The base plate (30) is provided with a process hole between two adjacent rib plates (34) for weight reduction.

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