CN116165766A - Support structure of ultra-slight crystal reflector, reflector assembly and assembly method - Google Patents

Abstract

The invention provides a support structure of an ultra-slight crystal reflector, a reflector assembly and an assembly method, wherein the support structure comprises a reflector frame and three groups of uniformly distributed flexible support assemblies, and the reflector frame supports the reflector; the flexible support assembly secures the mirror frame to the primary load bearing structure. The reflector adopts a main rib and sub rib combined cross light-weight form, so that the limit weight reduction is realized, the mirror support rigidity is increased, the grid effect is avoided, and the defect that the weight of the mirror body is increased due to too-dense arrangement of single-height light-weight ribs and the grid effect is increased due to too-sparse arrangement is overcome. The flexible supporting component is provided with the glue injection structure, and the soft adhesive is used for connecting to compensate the influence caused by the assembly position and angle tolerance of the support, so that the assembly stress is eliminated. The notch band is processed on the flexible supporting component and damping glue is locally injected, so that the effects of heat unloading and vibration reduction are realized, and the defects of poor vibration resistance and poor heat unloading capacity of the rigid structure of the traditional flexible structure are overcome.

Description

Support structure of ultra-slight crystal reflector, reflector assembly and assembly method

Technical Field

The invention belongs to the technical field of space optical remote sensors, and particularly relates to a support structure of an ultra-slight crystal reflector, a reflector assembly and an assembly method.

Background

With the development of space optical remote sensing technology, light-small-sized high-resolution imaging cameras are continuously emerging, and optical systems are increasingly compact and have high requirements for light weight. The low orbit satellite is influenced by the infrared and the albedo external heat flow of the earth, compared with the conventional orbit, the specific gravity is larger, the heat flow outside the light inlet of the camera is changed severely, and the thermal environment is complex and severe. When the external heat flow dynamically changes, the parameters such as optics, structure and the like of an imaging optical device in a camera system structure are extremely easy to be influenced by temperature effect to change, and the surface shape of a reflecting mirror is out of tolerance due to stress transmission into the reflecting mirror caused by structural change and material thermal property mismatch, so that the imaging quality is reduced, and therefore, the optical reflecting mirror supporting structure is required to have good thermal stress unloading capability and structural stability.

At present, microcrystals with smaller thermal expansion coefficients are mainly used as preparation materials of optical reflectors in China to reduce the influence of temperature effects, but back round holes are mainly used in a light-weight mode, and the light-weight degree is low. The mirror support is a glue suspension frame type support developed by Beijing spatial electromechanical research institute, adopts a form of radial support or tangential support of glue spots injected into the center of mass surface of the mirror, and requires that the mirror frame can surround the mirror, and adopts titanium alloy or indium steel material, and is heavier. In addition, the multi-point flexible support is characterized in that metal or nonmetal embedded blocks matched with the thermal characteristics of the reflector materials are bonded at the reflector support points, the degree of freedom of support constraint is decoupled through flexible links on the support structure, the structural assembly links are more, and the assembly and adjustment are complex.

Disclosure of Invention

In order to overcome the defects in the prior art, the inventor performs intensive research, provides a support structure of an ultra-slight crystal reflector, a reflector assembly and an assembly method, and solves at least one of the following technical problems:

1. the mass of the reflector and the supporting structure is as small as possible;

2. the requirements of an on-orbit temperature environment are met, and the thermal stability is met;

3. the requirements of the mechanical environment in the transmitting process are met, and the mechanical stability is met;

4. meets the system adjustment requirement and eliminates the assembly stress.

Therefore, the technical scheme provided by the invention is as follows:

in a first aspect, a support structure for an ultra-light crystal mirror, comprising: the flexible support assembly comprises a reflector frame and three groups of flexible support assemblies uniformly distributed, wherein the reflector frame supports the reflector; the flexible supporting component comprises a tooth slot lug and a flexible hinge support, and the tooth slot lug is fixed on the reflector frame; the flexible hinge support comprises a bottom support, a middle support and a top groove, wherein the bottom support is fixedly connected with a main bearing structure of the camera by adopting a threaded connecting piece, the middle support is connected with the bottom support and the top groove, the middle support is a central symmetrical support structure, two horizontal through holes facing opposite sides are respectively processed in the orthogonal direction of the support structure, and notch strips are processed on the outer wall surfaces of the two through holes facing the sides respectively, so that the through holes are communicated with the outside along the paths of the notch strips to form open through holes; the top groove accommodates the tooth slot lugs therein to connect the reflector frame to the main bearing structure of the camera.

Further, the reflector frame is of a C/SiC composite material cylindrical structure, the middle section of the outer wall is provided with a flange edge serving as an adapter, the bottom of the outer wall is provided with an annular bottom plate, the reflector frame supports the reflector, the annular bottom plate is in contact with the bottom of the reflector, and the annular bottom plate is fixedly connected with the reflector frame through a connecting piece penetrating through the reflector frame and the reflector.

Further, the tooth slot lugs are of a continuous Chinese character 'ji' shaped structure so as to form tooth slots which are arranged in an up-down staggered mode; the tooth teeth of the top groove are matched with the tooth groove lugs in a concave-convex mode when the tooth groove lugs are inserted into the top groove.

Further, a glue injection runner is reserved between the tooth teeth of the top groove and the tooth groove structure of the tooth groove lug, and soft adhesive is injected into the glue injection runner, so that the tooth groove lug and the top groove form a flexible connection structure.

Further, the through holes in the orthogonal direction of the middle support are not at the same height, the notch bands communicated with the through holes in the orthogonal direction are not intersected, and the two notch bands respectively communicated with the two through holes in the same direction are symmetrically machined on the middle support.

Further, the middle support is a cross support structure, adjacent support columns on the cross support structure are orthogonal, and two horizontal through holes facing opposite support columns are respectively processed on each support column and are communicated with the outside through notch belts.

In a second aspect, an ultra-light crystal mirror assembly comprises a micro-mirror and a support structure according to any one of claims 1 to 6, wherein the micro-mirror is bonded to the mirror frame of the support structure by a soft adhesive.

Further, the back of the microcrystal reflector is processed into triangular main rib structures, and Y-shaped sub ribs of equal arms are arranged in the triangular main rib structures, and the heights of the Y-shaped sub ribs are lower than those of the triangular main ribs.

Further, the Y-shaped sub-ribs take the edges of the triangular main ribs as the bottom edges, and the end parts of the Y-shaped sub-ribs are in smooth transition with the bottom edges; preferably, the wall thickness of the triangular main rib structure is 4-6mm; the height of the Y-shaped sub-ribs is 40% -60% of the height of the main ribs, and the wall thickness of the Y-shaped sub-ribs is 3-5mm.

In a third aspect, a method of assembling an ultra-slight crystal mirror assembly includes:

the reflector is put into the reflector frame, a clearance between the reflector body and the reflector frame is controlled by a feeler gauge, and soft adhesive is injected between the reflector body and the reflector frame, and the soft adhesive is cured;

three groups of tooth slot lugs are fixed on the reflector frame, meanwhile, damping glue is locally injected into the notch of the soft hinge support, the tooth slot lugs are temporarily positioned and assembled by adopting a threaded connecting piece after being inserted into the top groove of the soft hinge support, the soft hinge support is installed on a main bearing structure of a camera by adopting the threaded connecting piece, after the reflector is adjusted in place, soft adhesive is injected between the tooth slot lugs and the top groove of the soft hinge support, and after the soft adhesive is solidified, the temporary positioning and assembling of the tooth slot lugs and the top groove are removed, so that the assembly of the supporting structure is completed.

According to the support structure of the ultra-slight crystal reflector, the reflector assembly and the assembly method provided by the invention, the support structure has the following beneficial effects:

(1) The ultra-slight crystal reflecting mirror component provided by the invention has the advantages that in order to improve the weight reduction efficiency and ensure good rigidity and optical processing manufacturability, the microcrystalline reflecting mirror adopts a back triangle main rib and sub rib combined cross light form, the reflecting mirror adopts the main rib and sub rib combined cross light form to realize limit weight reduction, the mirror support rigidity is increased, the grid effect is avoided, and the defects that the weight of the mirror is increased due to the arrangement of single height light weight ribs, and the optical processing grid effect is increased due to the arrangement of the single height light weight ribs are overcome.

(2) The support structure of the ultra-light crystal reflector provided by the invention has the advantages that in order to meet the requirement of thermal stability, the reflector support frame is made of the C/SiC material with low thermal expansion coefficient, high elastic modulus and low density, and the requirement of ultra-light quality can be met at the same time.

(3) According to the support structure of the ultra-slight crystal reflector, the reflector and the reflector frame are supported by the combination of the three groups of flexible hinge supports, two horizontal through holes facing opposite sides are respectively processed in the orthogonal direction of the middle support structure of each group of flexible hinge supports, notch strips are processed on the outer wall surfaces of the two through holes facing the sides of the two through holes, and the through holes are communicated with the outside along the paths of the notch strips to form open through holes. Therefore, the bending rigidity and the torsional rigidity of the middle support are weakened, only 2 translational degrees of freedom are restrained, the quasi-static support is realized, and the influence of temperature change on the precision of the mirror surface type can be obviously reduced;

the notch belt is locally injected with damping glue, and the composite material mirror frame with low thermal expansion coefficient is combined with the damping glue injection flexible hinge support, so that the effects of heat unloading and vibration reduction are realized, and the defects of poor vibration resistance and poor heat unloading capacity of the rigid structure of the traditional flexible structure are overcome.

(4) In order to eliminate assembly stress, the assembly method of the ultra-slight crystal reflecting mirror assembly provided by the invention comprises the steps of firstly installing the soft hinge support, then injecting soft adhesive between the tooth socket lug and the top groove of the soft hinge support to form flexible connection, and jointly realizing the unloading of the assembly stress by the design of the soft hinge support and the glue injection structure.

Drawings

FIG. 1 is a schematic view of an ultra-light crystal reflector and support structure assembly of the present invention;

FIG. 2 is a schematic view of a light-weight structure of a micro-mirror according to the present invention;

FIG. 3 is a schematic view of a reflector frame according to the present invention;

FIG. 4 is a schematic view of a reflector and frame connection according to the present invention;

FIG. 5 is an enlarged view of a portion of the flexible support assembly structure of the present invention;

FIG. 6 is a schematic diagram of a structure of a glue injection tooth slot and a flexible slot of the damping glue injection flexible hinge support;

FIG. 7 is a partial cross-sectional view of a cross-support structure of the flexible hinge support according to the present invention;

fig. 8 is a diagram of a quasi-static support principle.

Detailed Description

The features and advantages of the present invention will become more apparent and clear from the following detailed description of the invention.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

According to a first aspect of the present invention, there is provided a support structure for an ultra-slight crystal reflector, as shown in fig. 1, including a reflector frame (fig. 3) and three groups of uniformly distributed flexible support assemblies, where the reflector frame is a C/SiC composite cylindrical structure, a flange is provided in the middle of the outer wall as an adapter, an annular bottom plate is provided at the bottom, the reflector frame supports the reflector (fig. 2), the annular bottom plate contacts with the bottom of the reflector, and the reflector frame and the reflector are fixedly connected by a connecting member penetrating the reflector frame and the reflector (fig. 4).

The flexible supporting component comprises tooth slot lugs and a flexible hinge support, and as shown in fig. 5, the tooth slot lugs are of a continuous Chinese character 'ji' shaped structure so as to form tooth slots which are arranged in an up-down staggered manner, and the tooth slot lugs are fixed on the flange edge of the reflector frame through threaded connecting pieces; as shown in fig. 5 and 6, the flexible hinge support comprises a bottom support, a middle support and a top groove, wherein the bottom support is fixedly connected with a main bearing structure of the camera by adopting a threaded connecting piece, the middle support is connected with the bottom support and the top groove, staggered teeth are machined in the top groove, the inner space of the top groove is matched with a tooth groove lug, and the teeth of the top groove form concave-convex fit with the tooth groove structure of the tooth groove lug when the tooth groove lug is inserted into the top groove.

A glue injection runner is reserved between the tooth teeth of the top groove and the tooth groove structure of the tooth groove lug, namely the end parts of the tooth teeth are not contacted with the bottom of the tooth groove structure, after the tooth groove lug is inserted into the top groove, soft adhesive (such as room temperature vulcanized silicone rubber RTV) is injected into the glue injection runner, and the soft adhesive has elasticity after being solidified, so that the tooth groove lug and the top groove form a flexible connection structure; the tooth slot glue injection structure adopts soft adhesive to connect to replace the traditional assembly adjusting gasket and threaded connection, can compensate the influence caused by the assembly position and angle tolerance of the soft hinge support, and realizes the unloading of assembly stress.

As shown in fig. 6 and 7, the middle support is a central symmetrical support structure, two horizontal through holes facing opposite sides are respectively processed in the orthogonal direction of the support structure, and notch strips are processed on the outer wall surfaces of the two through holes facing the sides of the two through holes, so that the through holes are communicated with the outside along the paths of the notch strips, and an open through hole is formed. The through holes in the orthogonal direction are not at the same height, the notch strips communicated with the through holes in the orthogonal direction are not intersected, and preferably, the two notch strips respectively communicated with the two through holes in the same direction are symmetrically processed on the middle support. Therefore, the bending rigidity and the torsional rigidity of the middle support are weakened, only 2 translational degrees of freedom are restrained, the quasi-static support is realized, and the influence of temperature change on the precision of the reflecting mirror surface can be obviously reduced. Preferably, the notch belt is locally injected with damping glue, so that the effects of heat unloading and vibration reduction are improved.

The three flexible support assemblies are uniformly distributed on the same circumference at 120 degrees, under the local coordinate system shown in fig. 8, each flexible support assembly only restrains translational degrees of freedom in the X and Y directions of the reflector, all other degrees of freedom are released, and the Z axes of the local coordinate systems of the three support points pass through the same point (hot center). And under the ideal state without considering friction, the flexible support component has no redundant constraint on the reflector, so that the statically determinate support is realized.

The middle support is preferably designed as a cross support structure, which, compared to a cylindrical or square support or the like, has the most direct force transmission path, so that the structural configuration is the most rigid and the least weight; and the flexible link runs through direction structure thicker, conveniently sets up, processes non-deformable. Adjacent support columns on the cross support structure are orthogonal, and two horizontal through holes facing opposite support columns are respectively processed on each support column and are communicated with the outside through notch belts.

According to a second aspect of the present invention, there is also provided an ultra-light crystal mirror assembly comprising a micro-crystal mirror and the support structure of the first aspect, wherein the micro-crystal mirror is bonded to the mirror frame of the support structure by a soft adhesive (e.g. room temperature vulcanized silicone rubber RTV).

In order to improve the weight reduction efficiency and ensure good rigidity and optical processing manufacturability, as shown in fig. 2, the back of the microcrystalline reflector is processed into a triangular main rib structure, an equilateral Y-shaped sub rib is arranged in each triangular main rib structure, the height of the Y-shaped sub rib is lower than that of the triangular main rib, and the triangular main rib-Y-shaped sub ribs are combined to form a cross lightweight form. The Y-shaped sub-ribs of the equal arms take the side of the triangular main rib as the bottom side, and the end parts of the Y-shaped sub-ribs and the bottom side are in smooth transition so as to form a stable support. Preferably, the wall thickness of the triangular main rib structure is 4-6mm; the height of the Y-shaped sub-ribs is 40% -60% of the height of the main ribs, and the wall thickness of the Y-shaped sub-ribs is 3-5mm.

The inventor finds that the triangle main rib and sub rib combined cross light weight form has higher light weight degree and no obvious weakening of specific rigidity compared with the traditional round hole-shaped light weight structure, can realize larger triangle light weight rib side length compared with the pure triangle light weight structure, and reduces the influence of mirror surface grid effect on the surface shape through sub rib reinforcement.

According to a third aspect of the present invention, there is also provided a method of assembling an ultra-slight crystal mirror assembly. Before the reflector assembly is assembled, all parts should be cleaned and tried-on. The reflector is put into the reflector frame, a clearance between the reflector body and the reflector frame is controlled by a feeler gauge, and soft adhesive is injected between the reflector body and the reflector frame to wait for the completion of curing of the soft adhesive. The flange edge of the reflector frame is fixed with three groups of tooth groove lugs through threaded connectors, meanwhile, the notch of the soft hinge support is provided with local damping glue, the tooth groove lugs are temporarily positioned and assembled through the threaded connectors after being inserted into the top groove of the soft hinge support, the soft hinge support is installed on a main bearing structure of a camera through the threaded connectors, after the reflector is adjusted in place, soft adhesives are injected between the tooth groove lugs and the top groove of the soft hinge support, and after the soft adhesives are solidified, the temporary positioning and assembling of the tooth groove lugs and the top groove are removed, so that the assembly of the supporting structure is completed.

With the ultra-slight crystal reflecting mirror assembly (the middle support is a cross support structure) according to the second aspect and the assembling method according to the third aspect, for a specific embodiment of the present invention, the influence of the notch band on the mirror surface shape error on the middle support, the influence of the undamped adhesive, the influence of the adhesive between the tooth slot lug and the soft hinge support top slot on the response of the mirror vibration frequency are compared and analyzed, and the analysis results are shown in table 1.

TABLE 1

The invention has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the invention. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, and these fall within the scope of the present invention. The scope of the invention is defined by the appended claims.

What is not described in detail in the present specification is a well known technology to those skilled in the art.

Claims (10)

1. The support structure of the ultra-slight crystal reflector is characterized by comprising a reflector frame and three groups of uniformly distributed flexible support components, wherein the reflector frame supports the reflector; the flexible supporting component comprises a tooth slot lug and a flexible hinge support, and the tooth slot lug is fixed on the reflector frame; the flexible hinge support comprises a bottom support, a middle support and a top groove, wherein the bottom support is fixedly connected with a main bearing structure of the camera by adopting a threaded connecting piece, the middle support is connected with the bottom support and the top groove, the middle support is a central symmetrical support structure, two horizontal through holes facing opposite sides are respectively processed in the orthogonal direction of the support structure, and notch strips are processed on the outer wall surfaces of the two through holes facing the sides respectively, so that the through holes are communicated with the outside along the paths of the notch strips to form open through holes; the top groove accommodates the tooth slot lugs therein to connect the reflector frame to the main bearing structure of the camera.

2. The support structure of the ultra-slight crystal reflector according to claim 1, wherein the reflector frame is of a C/SiC composite cylindrical structure, the middle section of the outer wall is provided with a flange edge as an adapter, the bottom is provided with an annular bottom plate, the reflector frame supports the reflector, the annular bottom plate is in contact with the bottom of the reflector, and the reflector frame and the reflector are fixedly connected through a connecting piece penetrating through the reflector frame.

3. The support structure of an ultra-slight crystal reflector of claim 1, wherein the spline lugs are in a continuous zigzag structure to form spline grooves arranged in an up-down staggered manner; the tooth teeth of the top groove are matched with the tooth groove lugs in a concave-convex mode when the tooth groove lugs are inserted into the top groove.

4. The support structure of the ultra-slight crystal reflector according to claim 1, wherein a glue injection runner is left between the tooth teeth of the top groove and the tooth groove structure of the tooth groove lug, and soft adhesive is injected into the glue injection runner to enable the tooth groove lug and the top groove to form a flexible connection structure.

5. The support structure of an ultra-slight crystal reflection mirror according to claim 1, wherein the through holes in the orthogonal direction of the middle support are not at the same height, the slit bands communicating with the through holes in the orthogonal direction are not intersected, and two slit bands respectively communicating with two through holes in the same direction are symmetrically processed on the middle support.

6. The support structure of an ultra-slight crystal reflecting mirror according to claim 5, wherein the middle support is a cross support structure, adjacent support columns on the cross support structure are orthogonal, and two horizontal through holes facing opposite support columns are respectively formed on each support column, and are communicated with the outside through a notch band.

7. An ultra-light crystal reflector assembly comprising a crystal reflector and a support structure according to any one of claims 1 to 6, wherein the crystal reflector is bonded to the reflector frame of the support structure by a soft adhesive.

8. The ultra-slight crystal mirror assembly of claim 7, wherein the back of the microcrystal mirror is processed into triangular main rib structures, and each triangular main rib structure is internally provided with an equilateral Y-shaped sub-rib, and the height of the Y-shaped sub-rib is lower than that of the triangular main rib.

9. The ultra-slight crystal reflecting mirror assembly according to claim 8, wherein the Y-shaped sub-ribs take the sides of the triangular main ribs as the bottom sides, and the end parts of the Y-shaped sub-ribs are in smooth transition with the bottom sides; preferably, the wall thickness of the triangular main rib structure is 4-6mm; the height of the Y-shaped sub-ribs is 40% -60% of the height of the main ribs, and the wall thickness of the Y-shaped sub-ribs is 3-5mm.

10. A method of assembling an ultra-fine crystal mirror assembly according to any one of claims 7 to 9, comprising:

the reflector is put into the reflector frame, a clearance between the reflector body and the reflector frame is controlled by a feeler gauge, and soft adhesive is injected between the reflector body and the reflector frame, and the soft adhesive is cured;

three groups of tooth slot lugs are fixed on the reflector frame, meanwhile, damping glue is locally injected into the notch of the soft hinge support, the tooth slot lugs are temporarily positioned and assembled by adopting a threaded connecting piece after being inserted into the top groove of the soft hinge support, the soft hinge support is installed on a main bearing structure of a camera by adopting the threaded connecting piece, after the reflector is adjusted in place, soft adhesive is injected between the tooth slot lugs and the top groove of the soft hinge support, and after the soft adhesive is solidified, the temporary positioning and assembling of the tooth slot lugs and the top groove are removed, so that the assembly of the supporting structure is completed.

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