A flexible support structure for reducing the bonding deformation of a swing mirror

Abstract

The present invention provides a flexible support structure for reducing the bonding deformation of a swing mirror, and belongs to the field of aerospace technology; the flexible support structure of the present invention comprises a base mounting hole, a flexible support seat and a swing mirror bonding boss, the flexible support seat is provided with arc-shaped flexible grooves uniformly distributed at a circumference of 120°, the swing mirror bonding boss is a local bonding type, and the outer convex part is bonded to the central circular mounting hole of the swing mirror; the present invention adopts a total of six arc-shaped flexible grooves, which can effectively reduce the rigid body displacement of the swing mirror structure under gravity load and temperature load, and reduce the influence of the load on the surface accuracy of the swing mirror, and at the same time, the local bonding boss structure can reduce the adverse effect of the bonding stress on the surface shape of the swing mirror under the premise of ensuring the installation strength when bonding with the swing mirror mounting hole.

Description

Technical Field

[0001] The invention belongs to the field of aerospace technology, and in particular relates to a flexible support structure for reducing bonding deformation of a swing mirror. Background Art

[0002] As an important tool for strategic support of modern aircraft, airborne laser communication equipment can establish communication links with other aircraft or ground terminals in flight, and has the advantages of high speed, high gain, small size, light weight, anti-electromagnetic interference, and not easy to be intercepted. As an excellent carrier for expanding the application space of laser communication, airborne platforms will surely become an indispensable means of communication in the future.

[0003] As an important component of laser communication equipment, the swing mirror assembly determines the stability of laser communication. It is required that the swing mirror assembly has the characteristics of strong resistance to external dynamic interference and ensure that the swing mirror surface shape changes little under airborne conditions. On the one hand, the swing mirror assembly will produce a certain degree of elastic deformation when subjected to gravity load and temperature load, which will degrade the surface accuracy of the swing mirror and affect the stability of laser communication. In order to reduce the influence of the elastic deformation caused by the above two loads on the surface shape of the swing mirror, the swing mirror is bonded to the flexible support structure by gluing and then fixed to the backplane for installation and fixation. On the other hand, gluing has the advantages of compact structure, flexible design, safety and reliability, and can effectively unload assembly stress. However, optical glue will inevitably bring stress due to volume shrinkage during the curing process, which is mainly reflected in the shrinkage force on the reflector in the adhesive spot bonding area. At the same time, as the ambient temperature changes, optical glue with a large expansion coefficient will also produce excess additional stress, which will also have an adverse effect on the surface accuracy of the swing mirror.

[0004] The oscillating mirror structure used for airborne laser communication is often ultra-thin, which brings great challenges to the design of flexible support structures. Traditional flexible support structures are difficult to eliminate the influence of the above-mentioned gravity temperature load and residual stress of bonding on the oscillating mirror surface shape. Therefore, it is necessary to design a reasonable flexible support structure to reduce the influence of external loads and optical glue curing shrinkage stress on the oscillating mirror surface accuracy while meeting the fixing strength, stability and effective positioning of the oscillating mirror assembly. Summary of the invention

[0005] The purpose of the present invention is to propose a flexible support structure for a swing mirror, so as to solve the problems existing in the prior art of flexible support technology that the external load on the swing mirror has a great influence on the surface shape, the assembly and gluing process level is high, and the surface shape accuracy does not meet the requirements of laser communication indicators due to the gluing stress after assembly.

[0006] The flexible support structure can provide the swing mirror with high rigidity and stable support, effectively reducing the influence of thermal load and gravity load on the surface accuracy of the swing mirror, while reducing the influence of additional stress generated during the bonding connection between the flexible support structure and the swing mirror on the surface accuracy of the swing mirror, thereby effectively ensuring the surface accuracy index requirements of the swing mirror and providing guarantee for the realization of airborne laser communication.

[0007] The technical solution of the present invention is to provide a flexible support structure of a swing mirror suitable for airborne laser communication equipment, comprising a flexible joint mounting base, a flexible joint substrate and a flexible joint bonding boss.

[0008] The special feature is that: the above-mentioned flexible joint is fixedly mounted on the swing mirror mounting substrate, and is adapted and connected through the flexible joint mounting base and the swing mirror mounting substrate, and the flexible joint bonding boss and the swing mirror mounting hole are adapted and connected; the three flexible joint mounting bases on the flexible joint are evenly distributed on the periphery of the flexible substrate, and each mounting base is provided with two flexible joint base mounting holes connected to the swing mirror mounting substrate; the three flexible joint outer grooves and the three flexible joint inner grooves on the flexible joint substrate are respectively distributed at intervals on the inner and outer sides of the substrate; the three flexible joint bonding surfaces and the three flexible joint hollow surfaces on the flexible bonding boss are respectively distributed at intervals.

[0009] Furthermore, the three flexible joint mounting bases are evenly distributed at 120° around the flexible substrate, and the flexible joint base mounting holes are optical holes with a diameter of 3.3 mm;

[0010] Furthermore, a 0.5 mm boss is provided below the three flexible joint mounting bases, the bottom surface of the boss is in contact with and connected to the flexible joint base mounting boss on the oscillating mirror mounting substrate, and the flexible joint base mounting boss is provided with a flexible joint base mounting boss threaded hole which is mounted in cooperation with the flexible joint base mounting hole, and the threaded hole size is M3;

[0011] Furthermore, the three outer slots of the flexible joint and the three inner slots of the flexible joint are evenly distributed on the flexible substrate at 120°, the arc of the slot is 90°, and the width of the slot is 1.5 mm;

[0012] Furthermore, the three flexible joint bonding surfaces and the three flexible joint hollow surfaces are evenly distributed on the flexible joint bonding boss at an angle of 120°, the curvature of the flexible joint bonding surface is 60°, and the curvature of the flexible joint hollow surface is 50°;

[0013] Furthermore, the three flexible joint bonding bosses are trapezoidal cylindrical bosses, the height of the flexible joint bonding bosses is 10 mm, and the flexible joint bonding surface is a conical surface with a taper of 1:10;

[0014] Furthermore, the thermal expansion coefficients of the materials used for the oscillating mirror body, the oscillating mirror flexible support structure, and the oscillating mirror mounting substrate are all matched.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The flexible support structure provided by the present invention is suitable for reducing the bonding deformation of the swing mirror, which can

[0017] 2. The oscillating mirror is fixed on the oscillating mirror mounting base by means of flexible support. When the external gravity direction, temperature, and vibration environment change, the flexible support can isolate deformation and stress, effectively reducing the impact on the oscillating mirror surface.

[0018] 3. The flexible support structure provided by the present invention is suitable for reducing the bonding deformation of the swing mirror. The thermal expansion coefficients of the materials of each component match each other and are circularly symmetrical, which effectively improves the thermal stability of the system.

[0019] 4. By setting the secondary reflector condition gasket and the correction mirror gasket, the position of the secondary mirror and the correction mirror can be easily adjusted during the installation and debugging process so that the system can meet the functionality required by the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the swing mirror flexible joint structure of the airborne laser communication equipment in the embodiment of the present invention;

[0021] Figure 2 It is a forward exploded view of the installation of the swing mirror flexible joint substrate of the airborne laser communication equipment in an embodiment of the present invention;

[0022] Figure 3 It is a side exploded view of the installation of the swing mirror flexible joint substrate of the airborne laser communication equipment in the embodiment of the present invention;

[0023] Description of reference numerals:

[0024] 1-flexible joint, 11-flexible joint mounting base, 111-flexible joint base mounting hole, 12-flexible joint substrate, 121-flexible joint outer slot, 122-flexible joint inner slot, 13-flexible joint bonding boss, 131-flexible joint bonding surface, 132-flexible joint hollow surface, 2-oscillating mirror, 21-oscillating mirror mounting hole, 22-oscillating mirror hollow groove, 3-oscillating mirror mounting substrate, 31-flexible joint base mounting boss, 311-flexible joint base mounting boss threaded hole, 32-oscillating mirror mounting substrate rotating shaft, 33-oscillating mirror mounting substrate hollow groove Specific implementation plan

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Combined with Figures 1 to 3A flexible support structure for reducing the bonding deformation of a swing mirror, comprising a flexible joint mounting base 11, a flexible substrate 12 and a flexible joint bonding boss 13, wherein the flexible joint 1 is fixedly mounted on the swing mirror mounting substrate 3, and the flexible joint mounting base 11 and the swing mirror mounting substrate 3 are adapted to be connected, and the flexible joint bonding boss 13 and the swing mirror mounting hole 21 are adapted to be connected, and the three flexible joint mounting bases 11 on the flexible joint are evenly distributed on the periphery of the flexible joint substrate 12, and each mounting base is provided with two flexible joint base mounting holes 111 connected to the swing mirror mounting substrate 3; the three flexible joint outer grooves 121 and the three flexible joint inner grooves 122 on the flexible joint substrate 12 are respectively spaced apart on the inner and outer sides of the substrate; the three flexible joint bonding surfaces 131 and the three flexible joint hollow surfaces 132 on the flexible bonding boss 13 are respectively spaced apart.

[0027] The three flexible joint mounting bases 11 are evenly distributed at 120 degrees around the flexible substrate 12, and the flexible joint base mounting hole 111 is a light hole with a diameter of 3.3 mm;

[0028] A 0.5 mm boss is provided below the three flexible joint mounting bases 11, and the bottom surface of the boss is in contact with and connected to the flexible joint base mounting boss 31 on the oscillating mirror mounting substrate 3. The flexible joint base mounting boss 31 is provided with a flexible joint base mounting boss threaded hole 311 which is mounted in cooperation with the flexible joint base mounting hole 111, and the threaded hole size is M3;

[0029] The three flexible joint outer side slots 121 and the three flexible joint inner side slots 122 are evenly distributed on the flexible substrate 12 at 120°, the slot arc is 90°, and the slot width is 1.5 mm;

[0030] The three flexible joint bonding surfaces 131 and the three flexible joint hollow surfaces 132 are evenly distributed on the flexible joint bonding boss 13 at an angle of 120°, the arc of the flexible joint bonding surface 131 is 60°, and the arc of the flexible joint hollow surface 132 is 50°;

[0031] The flexible joint bonding boss 13 is a trapezoidal cylindrical boss, the height of the flexible joint bonding boss 13 is 10 mm, and the flexible joint bonding surface 131 is a conical surface with a taper of 1:10;

[0032] The oscillating mirror mounting hole 21 is a conical hole with a taper of 1:10, and has a matching surface with the same size as the flexible joint bonding surface 131 for adhesive mounting.

[0033] The thermal expansion coefficients of the materials used for the flexible joint 1, the oscillating mirror 2 and the oscillating mirror mounting substrate 3 are matched. The flexible joint 1 is made of Invar, the oscillating mirror 2 is made of glass-ceramic material, and the oscillating mirror mounting substrate 3 is made of titanium alloy.

[0034] The above-mentioned flexible support structure for reducing the adhesive deformation of the swing mirror utilizes the bending elastic deformation of the outer slot 121 of the flexible joint and the inner slot 122 of the flexible joint, and a small displacement can be generated between the swing mirror mounting hole 21 and the flexible joint base mounting boss 31, which can eliminate the internal stress of the airborne laser communication swing mirror assembly caused by temperature load and assembly error. The central axis of the outer slot 121 of the flexible joint and the inner slot 122 of the flexible joint intersects at one point, and the focus coincides with the center of mass of the swing mirror 1, which can reduce the deformation of the swing mirror surface caused by the gravity moment and improve the surface shape accuracy of the swing mirror. The flexible joint bonding surface 131 and the flexible joint hollow surface 132 are designed in an alternating layout mode on the flexible joint bonding boss 13. The three flexible joint bonding surfaces 131 are glued and installed with the swing mirror mounting hole 21 to ensure the support strength. The three flexible joint hollow surfaces 132 eliminate the residual stress generated by the optical glue bonding, while ensuring the stability of the flexible joint support structure, reducing the influence on the deformation of the swing mirror, and effectively improving the surface shape accuracy of the swing mirror.

[0035] Finally, it should be noted that the above embodiments only illustrate the implementation methods of the present invention and describe them in detail rather than limiting them. For ordinary professional and technical personnel in the field, the specific technical implementation plans recorded in the aforementioned embodiments can be modified, or some of the technical features therein can be replaced by equivalents, and these modifications or replacements all fall within the scope of the technical solution protected by the present invention.

Claims

1. A flexible support structure for reducing the bonding deformation of a swing mirror, characterized in that: It comprises a flexible joint mounting base (11), a flexible substrate (12) and a flexible joint bonding boss (13); the center lines of the flexible joint mounting base (11), the flexible substrate (12) and the flexible joint bonding boss (13) are coaxial; the flexible joint mounting base (11) and the oscillating mirror mounting substrate (3) are adaptively connected; and the flexible joint bonding boss (13) and the oscillating mirror mounting hole (21) are adaptively connected; The flexible joint comprises three flexible joint mounting bases (11) which are evenly distributed around the flexible substrate (12), and each mounting base is provided with two flexible joint base mounting holes (111) which are connected to the oscillating mirror mounting substrate (3); The flexible substrate (12) comprises three flexible joint outer side slots (121) and three flexible joint inner side slots (122), wherein the flexible joint outer side slots (121) and the flexible joint inner side slots (122) are respectively distributed at intervals inside and outside the substrate; The flexible joint bonding boss (13) comprises three flexible joint bonding surfaces (131) and three flexible joint hollow surfaces (132), the three flexible joint hollow surfaces (132) are located on the inner side, and the three flexible joint bonding surfaces (131) are located on the outer side, the flexible joint bonding surfaces (131) and the flexible joint hollow surfaces (132) are respectively distributed at intervals, and the adjacent ends of the flexible joint bonding surfaces (131) and the flexible joint hollow surfaces (132) are connected to form a ring structure.

2. A flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The three flexible joint mounting bases (11) are evenly distributed at 120° on the periphery of the flexible substrate (12), and the flexible joint base mounting holes (111) are optical holes with a diameter of 3.3 mm.

3. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: A 0.5 mm boss is arranged below the three flexible joint mounting bases (11), the bottom surface of the boss is in contact with and connected to a flexible joint base mounting boss (31) on the oscillating mirror mounting substrate (3), and the flexible joint base mounting boss (31) is provided with a flexible joint base mounting boss threaded hole (311) which is mounted in cooperation with the flexible joint base mounting hole (111), and the threaded hole size is M3.

4. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The three flexible joint outer side slots (121) and the three flexible joint inner side slots (122) are evenly distributed on the flexible substrate (12) at an angle of 120°, the slot arc is 90°, and the slot width is 1.5 mm.

5. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The three flexible joint bonding surfaces (131) and the three flexible joint hollow surfaces (132) are uniformly distributed on the flexible joint bonding boss (13) at an angle of 120°, the curvature of the flexible joint bonding surface (131) is 60°, and the curvature of the flexible joint hollow surface (132) is 50°.

6. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The flexible joint bonding boss (13) is a trapezoidal cylindrical boss, the height of the flexible joint bonding boss (13) is 10 mm, the minimum outer diameter of the top flexible joint bonding surface is 55 mm, and the maximum outer diameter of the bottom flexible joint bonding surface is 56 mm.

7. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The flexible joint installation base (11), the flexible substrate (12) and the flexible joint bonding boss (13) of the flexible support structure are integrally formed.

8. The flexible support structure for reducing bonding deformation of a swing mirror according to claim 1, characterized in that: The flexible support structure is made of Invar material.

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