Composite material box for carrying high-precision optical module

Abstract

The invention provides a composite material box body carrying a high-precision optical module, the box body comprises a titanium alloy lining, the titanium alloy lining is provided with a mounting port, and a carbon fiber inner skin, a carbon fiber composite material interlayer and a carbon fiber outer skin are sequentially arranged outside the titanium alloy lining. Openings are reserved in the positions, corresponding to the installation openings, of the carbon fiber inner skin, the carbon fiber composite material interlayer and the carbon fiber outer skin, and cover plates used for installing optical modules are arranged on the installation openings. The carbon fiber composite material interlayer comprises a structural frame body, an opening wrapping edge is arranged at the opening position of the structural frame body, longitudinal ribs and annular ribs are arranged on the two side faces of the structural frame body, the longitudinal ribs are arranged in the length direction of the box body, the annular ribs and the longitudinal ribs are arranged in a crossed mode, and gaps between the longitudinal ribs and the annular ribs are filled with honeycomb core materials. According to the invention, the structure is designed into a high-rib structure in which the thin skin is matched with the dense high-rib structure, so that the light weight of equipment and the environmental requirements of ultrahigh structural rigidity, high thermal stability, high gas tightness, high-energy stray light resistance and the like of an internal high-precision optical module are met.

Description

TECHNICAL FIELD

[0001] The present application relates to a box, in particular to a composite material box carrying a high-precision optical module. BACKGROUND

[0002] The high-precision optical module requires the box to have lightweight, ultra-high structural stiffness, high thermal stability, simple inner cavity structure, resistance to stray light and easy to clean, good overall sealing, and also meet the requirements of mold, moisture and salt spray corrosion resistance. The stiffness of the equipment mounting point in the box directly affects the energy concentration density and the precision of the output of the light beam. At the same time, the purity of the gas in the box also has a great influence on the performance, so the box itself should have good sealing performance and the gas release should meet the requirements. Considering that the temperature rise in the box will have the risk of decomposing the resin-based composite material, therefore, the all-composite material box is not suitable, and the box made of pure titanium alloy cannot meet the requirement of lightweight structure.

[0003] The box structure prepared by the prior art is difficult to meet the installation requirements of the high-precision optical module and other equipment with high precision, thermal stability and environmental adaptability. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art, and provide a composite material box carrying a high-precision optical module, which meets the requirements of lightweight equipment and internal high-precision optical module with ultra-high structural stiffness, high thermal stability, high gas sealing, resistance to high-energy stray light and other environmental requirements.

[0005] The present application provides the following technical solutions:

[0006] The present application provides a composite material box carrying a high-precision optical module, the box comprising a titanium alloy lining, a plurality of mounting openings are formed on the titanium alloy lining, a carbon fiber inner skin, a carbon fiber composite material interlayer and a carbon fiber outer skin are sequentially arranged outside the titanium alloy lining, the carbon fiber inner skin, the carbon fiber composite material interlayer and the carbon fiber outer skin are provided with openings corresponding to the positions of the mounting openings, and a cover plate for mounting the optical module is arranged on the mounting opening; the carbon fiber composite material interlayer comprises a structural frame, the structural frame is arranged between the carbon fiber inner skin and the carbon fiber outer skin, the structural frame is provided with an opening edge at the opening, longitudinal ribs and ring ribs are arranged on the two side surfaces of the structural frame, the longitudinal ribs are arranged in parallel along the length direction of the box, the ring ribs are arranged in cross with the longitudinal ribs, the space between the longitudinal ribs and the ring ribs is filled with a honeycomb core material, and a plurality of groups of embedded connecting pieces are arranged on the ring ribs.

[0007] Further, the contact area between the honeycomb core material and the longitudinal ribs and the ring ribs is provided with foaming glue.

[0008] Further, the structural frame body bottom four corners are connected with the base, the base is fixedly connected with the structural frame body through the fastener, and the connecting gap of the fastener is filled with sealant.

[0009] Further, the structural frame body comprises an upper panel, a lower panel, a front panel and a rear panel, the longitudinal rib connects the front panel and the rear panel, and the ring rib connects the upper panel and the lower panel.

[0010] Further, the ring rib is perpendicular to the longitudinal rib, and the ring rib is cut off by the longitudinal rib.

[0011] Further, the outer surface of the titanium alloy lining is subjected to sand blasting treatment.

[0012] Further, the edge of the cover plate is connected with the mounting port through the fastener, and the connecting gap of the fastener is filled with sealant.

[0013] The present application has the following beneficial effects:

[0014] 1. The titanium alloy lining and the carbon fiber composite material are matched in the present application, the structure is designed as a thin skin matched with a dense high rib structure, the light weight of the equipment and the environmental requirements such as ultra-high structural stiffness, high thermal stability, high gas tightness, high energy stray light resistance of the internal high-precision optical module are met.

[0015] 2. The present application fills the gap between the longitudinal rib and the ring rib with a honeycomb core material, increases the local stiffness of the structure, increases the local instability resistance of the structure, and ensures the micro-deformation requirement of the connection node of the high-precision optical module in the box.

[0016] 3. The contact area of the core material, the longitudinal rib and the ring rib is provided with foaming glue, a variable stiffness transition layer is formed, stress concentration caused by rigid discontinuity is prevented, continuity of load transmission is ensured, and service durability of the structure is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 It is a structural schematic diagram of the box body in the embodiment of the present application.

[0019] Fig. 2 It is a structural schematic diagram of the carbon fiber composite material interlayer in the embodiment of the present application.

[0020] Fig. 3It is a cross section schematic view of the box structure in the embodiment of the present application.

[0021] Fig. 4 It is a schematic view of the base mounting structure in the embodiment of the present application.

[0022] In the figure: 1-base; 2-cover plate; 3-carbon fiber outer skin; 4-carbon fiber composite sandwich; 41-opening hem; 42-longitudinal rib; 43-circumferential rib; 44-structural frame; 45-honeycomb core material; 5-carbon fiber inner skin; 6-titanium alloy inner liner; 7-embedded connecting piece. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0024] Reference Figs. 1-4 The embodiment of the present application provides a composite box carrying a high-precision optical module. The box comprises a titanium alloy inner liner 6, a plurality of mounting openings are formed in the titanium alloy inner liner 6, a carbon fiber inner skin 5, a carbon fiber composite sandwich 4 and a carbon fiber outer skin 3 are sequentially arranged outside the titanium alloy inner liner 6, openings are left at positions corresponding to the mounting openings on the carbon fiber inner skin 5, the carbon fiber composite sandwich 4 and the carbon fiber outer skin 3, a cover plate 2 for mounting the optical module is arranged on the mounting openings; the carbon fiber composite sandwich 4 comprises a structural frame 44, the structural frame 44 is arranged between the carbon fiber inner skin 5 and the carbon fiber outer skin 3, the structural frame 44 is provided with an opening hem 41 at the opening, longitudinal ribs 42 and circumferential ribs 43 are arranged on two sides of the structural frame 44, the longitudinal ribs 42 are arranged along the length direction of the box, the circumferential ribs 42 are arranged in cross with the longitudinal ribs 43, the gap between the longitudinal ribs 42 and the circumferential ribs 43 is filled with a honeycomb core material 45, and a plurality of groups of embedded connecting pieces 7 are arranged on the circumferential ribs 43.

[0025] The carbon fiber inner skin 5, the carbon fiber outer skin 3, the longitudinal ribs 42 and the circumferential ribs 43 are all made of T800 carbon fiber, and the structural frame 44 is made of PMI foam; the longitudinal ribs 42 and the circumferential ribs 43 adopt a C-shaped structure, the longitudinal ribs 42 are continuous, the circumferential ribs 43 are disconnected, and the circumferential ribs 43 are connected to the longitudinal ribs 42 by flanging. The stiffness of the honeycomb core material is xx-xx, and the material is aluminum.

[0026] The edge of the cover plate 2 is connected with the mounting port through fasteners, and the connecting gaps of the fasteners are filled with sealant. The bottom of the structural frame is connected with a base, and the base 1 is composed of four parts, i.e., base 11 to base 14, which are respectively installed at the four corner points of the bottom surface of the box body. The base 1 is fixedly connected with the structural frame 44 through fasteners, and the connecting gaps of the fasteners are filled with sealant. The fasteners can be rivets. When the cover plate is installed, a plurality of rivet holes are punched at the contact position of the edge of the cover plate and the mounting port, and the rivet holes are fixed by rivets. Similarly, the base is fixed by rivet holes and rivets. After the base and the cover plate are installed, the periphery of the rivet hole is filled with sealant to prevent water vapor from entering.

[0027] The box body adopts a sandwich structure of a titanium alloy inner lining 6, a carbon fiber inner skin 5, a carbon fiber composite material layer 4, and a carbon fiber outer skin 3. The carbon fiber composite material layer 4 includes a structural frame 44. The longitudinal ribs 42 and the ring ribs 43 provided on the two sides of the structural frame form a reinforcing rib structure. The openings and the mounting ports are correspondingly arranged to form a laminated structure. The cover plate is installed through the openings and the mounting ports. The opening edges are provided with opening edges to ensure the sealing property of the structure. The cover plate 2 is composed of eight parts, i.e., cover plate 201 to cover plate 208. The cover plates 201 and 202 are respectively installed at the front and rear end surfaces of the box body. The cover plates 203 to 206 are respectively installed at the side surfaces of the box body. The cover plates 207 and 208 are installed at the upper surface of the box body. The opening edges are composed of eight parts, i.e., edge 4101 to edge 4108, which correspond to the cover plates 201 to 208 respectively.

[0028] The edges of the openings of the box body and the bolt mounting positions are pre-buried with composite material bodies to avoid collapse and exposure. The base 1 and the cover plate 2 are connected with the box body through fasteners. The connection points of the equipment are connected by pre-buried titanium alloy blocks in the main body of the box.

[0029] The longitudinal ribs 42 are composed of 20 parts, i.e., longitudinal rib 4201 to longitudinal rib 4220. The eight parts 4201 to 4208 are installed at the left side surface of the box body. The eight parts 4209 to 4216 are installed at the right side surface of the box body. The four parts 4217 to 4220 are installed at the bottom surface of the box body.

[0030] The ring ribs 43 are composed of 40 parts, i.e., ring rib 4301 to ring rib 4340. The 14 parts 4301 to 4314 are installed at the left side surface of the box body. The 14 parts 4315 to 4328 are installed at the right side surface of the box body. The 12 parts 4329 to 4340 are installed at the bottom surface of the box body.

[0031] The carbon fiber longitudinal ribs 42 are arranged longitudinally along the length direction of the box body. The ring ribs 43 are arranged annularly along the length direction. The ring ribs are cut by the longitudinal ribs.

[0032] The outer skin 3 is made by laying and curing on the basis of the core layer and the longitudinal rib 42 and the annular rib 43, and the structural frame body 44 is integrally made of a woven body, so that the honeycomb is prevented from being collapsed by lateral pressure during laying and curing of the outer skin 3.

[0033] The inner surface of the titanium alloy lining 6 should be smooth to meet the roughness requirement of the box body, and the outer surface is sandblasted to increase the roughness, so that the interface performance of the titanium alloy lining 6 and the carbon fiber inner skin 5 is increased.

[0034] The high-rigidity aluminum honeycomb core material 45 is filled between the longitudinal rib 42 and the annular rib 43 to enhance the local rigidity of the structure, so that the local instability resistance of the structure is increased, and the micro-deformation requirement of the connection joint of the high-precision optical module in the box body is ensured. The contact area of the honeycomb core material 45 and the longitudinal rib 42 and the annular rib 43 is provided with foaming glue to form a variable-rigidity transition layer, the stress concentration problem caused by the rigidity discontinuity between the honeycomb core material 45, the longitudinal rib 42 and the annular rib 43 is solved, the continuity of load transmission is further ensured, and the service durability of the structure is ensured.

[0035] The box body structure of the application cooperatively realizes high-rigidity design of the structure:

[0036] Firstly, the gradient composite theory is adopted, the overall structure is designed as a sandwich structure of rigidity+flexibility+rigidity, when there is a temperature difference in the structure, the thermal expansion performance of the respective bonding materials of the rigid layers on both sides is consistent, the difference of the thermal expansion is transmitted to the flexible layer, and the thermal stress is eliminated / reduced by the soft micro-deformation. The bonding between the honeycomb core and the reinforcing rib adopts high-performance resin, so as to form a variable-rigidity transition layer between the honeycomb core and the carbon fiber composite reinforcing rib, so as to solve the stress concentration problem caused by the rigidity discontinuity between the two, further ensure the continuity of load transmission, and improve the reliability of the structure.

[0037] Secondly, the titanium alloy embedded part (anchoring), the reinforcing rib (force transmission) and the honeycomb filling (uniform distribution) are cooperated, which is essentially a "point-line-surface" load dispersion transmission chain. The embedded part bears local high-level stress, the reinforcing rib diffuses high stress in a direction, the honeycomb core supports and uniformly distributes the load of the whole structure, further reduces the local excessive stress, reduces the risk of structure damage, and improves the overall load capacity of the structure. Through this design, the scheme reduces by 30% compared with the original titanium alloy scheme, the local rigidity is increased by more than 10%, and the deformation requirement (deformation level is 10-7mm) of the high-precision optical element is met.

[0038] The box body structure of the application is suitable for the particularity of optical module installation:

[0039] In view of the requirement of preventing stray light, the titanium alloy lining is installed in the structure, which does not play a role in reinforcing the rigidity of the structure, mainly prevents the ablation damage to the structure, effectively disperses the local heat aggregation, and avoids the influence of local high temperature on the structure material.

[0040] For the air tightness requirement: the connection mode adopts internal pre-embedded metal inserts, the connection does not punch through the structure, and a sealing ring is installed in the groove at the connection.

[0041] The composite material box body for carrying the high-precision optical module has high material maturity, mature processing technology and low structure manufacturing difficulty, can ensure the requirements of the installed high-precision optical module, such as ultra-high structural stiffness, high thermal stability, high air tightness, high-energy stray light resistance and the like, and is easy to clean, mildew-proof, moisture-proof and salt mist corrosion-proof.

[0042] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A composite material housing equipped with a high-precision optical module, characterized in that, The box body comprises a titanium alloy inner liner, a plurality of mounting openings are formed on the titanium alloy inner liner, a carbon fiber inner skin, a carbon fiber composite material interlayer and a carbon fiber outer skin are sequentially arranged outside the titanium alloy inner liner, the carbon fiber inner skin, the carbon fiber composite material interlayer and the carbon fiber outer skin are provided with openings corresponding to the positions of the mounting openings, and a cover plate for mounting an optical module is arranged on the mounting openings; The carbon fiber composite material interlayer comprises a structural frame, the structural frame is arranged between the carbon fiber inner skin and the carbon fiber outer skin, the structural frame is provided with an opening edge at the opening, longitudinal ribs are arranged on the two side surfaces of the structural frame, the ring ribs are arranged in a cross manner with the longitudinal ribs, the gaps between the longitudinal ribs and the ring ribs are filled with honeycomb core materials, and a plurality of groups of embedded connecting pieces are arranged on the ring ribs.

2. The composite case carrying a high-precision optical module according to claim 1, characterized by: The contact areas of the honeycomb core materials, the longitudinal ribs and the ring ribs are provided with foaming glue.

3. The composite case carrying a high-precision optical module according to claim 1, characterized by: Bottom seats are connected to the four corners of the bottom of the structural frame, the bottom seats are fixedly connected to the structural frame through fasteners, and sealing glue is filled in the connection gaps of the fasteners.

4. The composite case carrying a high-precision optical module according to claim 1, characterized by: The structural frame comprises an upper panel, a lower panel, a front panel and a rear panel, the longitudinal ribs are connected to the front panel and the rear panel, and the ring ribs are connected to the upper panel and the lower panel.

5. The composite case carrying a high-precision optical module according to claim 4, characterized by: The ring ribs are arranged perpendicularly to the longitudinal ribs, and the ring ribs are cut by the longitudinal ribs.

6. The composite case carrying a high-precision optical module according to claim 1, characterized by: The outer surface of the titanium alloy inner liner is subjected to sand blasting treatment.

7. The composite case carrying a high-precision optical module according to claim 1, characterized by: The edges of the cover plate are connected to the mounting openings through fasteners, and sealing glue is filled in the connection gaps of the fasteners.

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