A primary and secondary mirror support structure, molding die and method

Abstract

This invention discloses a primary and secondary mirror support structure, molding die, and method, relating to the field of primary and secondary mirror support technology for precision optomechanical systems. The primary and secondary mirror support structure includes a support cylinder, a mounting ring, a first mounting plate, a second mounting plate, and a third mounting plate. The support cylinder is made of continuous carbon fiber composite material, while the mounting ring, the first mounting plate, the second mounting plate, and the third mounting plate are made of chopped carbon fiber composite material. The primary and secondary mirror support structure is manufactured using an integrated molding method, effectively avoiding the use of metal embedded parts, improving the accuracy and stability of the device, and reducing weight. This invention provides a matching molding die and method for the support structure, enabling integrated molding of the primary and secondary mirror support structure, eliminating the need for separate molding of individual components and subsequent assembly, improving molding efficiency and accuracy, shortening the production cycle, and effectively reducing production costs.

Description

Technical Field

[0001] This invention relates to the field of primary and secondary mirror support technology for precision optomechanical systems, and in particular to a primary and secondary mirror support structure, molding die, and method. Background Technology

[0002] The primary and secondary mirror support structure is a crucial component of an optoelectronic tracking system. Its main function is to support and position the primary and secondary mirrors, ensuring the stability and accuracy of the optical system. It is widely used in fields such as space remote sensing, laser communication, optoelectronic countermeasures, and laser measurement. Traditional primary and secondary mirror support structures often use metal materials. While their processing is mature, they suffer from high mass and low specific stiffness, making it difficult to meet the requirements of lightweight and high stiffness. Furthermore, metal structures are prone to deformation under external loads, affecting the positional accuracy and surface stability of the mirrors. Moreover, the significant difference in thermal expansion coefficients between metal materials and optical mirror materials makes the primary and secondary mirror system susceptible to large thermal deformation due to temperature changes during service, severely weakening the stability and accuracy of the optical system. Compared to metal materials, carbon fiber composite materials are lighter, stronger, have better fatigue resistance, and a lower thermal expansion coefficient, and are increasingly being used in the fabrication of primary and secondary mirror support structures. However, existing carbon fiber composite primary and secondary mirror support structures typically employ a modular fabrication method, manufacturing each component separately before assembling them. Because of the manufacturing errors in the individual components, the accumulation of these errors after assembly often makes it difficult to meet the requirements of high-precision optical systems.

[0003] To address the issues of machining accuracy and assembly in carbon fiber composite components, existing solutions typically involve pre-embedding metal parts at the assembly locations before curing. However, the thermal expansion mismatch between the pre-embedded metal parts and the carbon fiber composite material can easily lead to significant thermal deformation or even structural failure at the interlayer interface, making it difficult to meet the design requirements for high precision and high stability. Summary of the Invention

[0004] The purpose of this invention is to provide a primary and secondary mirror support structure, molding die, and method to solve the problems existing in the prior art and improve the installation accuracy and stability of the primary and secondary mirror support structure.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a primary and secondary mirror support structure, including a support cylinder, a mounting ring, a first mounting plate, a second mounting plate, and a third mounting plate. The mounting ring is fixedly sleeved on the support cylinder, and the first, second, and third mounting plates are respectively fixedly disposed within the support cylinder. The first mounting plate is used to mount the primary mirror, and the second mounting plate is used to mount the focusing mechanism of the secondary mirror. The secondary mirror is fixedly connected to the output end of the focusing mechanism. Both the primary mirror mounted on the first mounting plate and the secondary mirror mounted on the focusing mechanism on the second mounting plate are located within the support cylinder. The secondary mirror mounted on the focusing mechanism on the second mounting plate is always spaced from the inner wall of the support cylinder within its adjustment range. The third mounting plate is used to mount optical elements. The support cylinder has two opposing light-transmitting holes on its side wall, and each light-transmitting hole penetrates the side wall of the support cylinder. The support cylinder, the mounting ring, the first mounting plate, the second mounting plate, and the third mounting plate are integrally formed; The support cylinder is made of continuous carbon fiber composite material, and the mounting ring, the first mounting plate, the second mounting plate and the third mounting plate are made of chopped carbon fiber composite material.

[0006] Preferably, the support cylinder includes a first cylinder, a second cylinder, and two connecting plates. Both the first cylinder and the second cylinder are circumferentially non-closed cylinders. The circumferential sidewall of the first cylinder is provided with a first opening that extends axially, and the circumferential sidewall of the second cylinder is provided with a second opening that extends axially. One end of the first opening is fixedly connected to one end of the second opening through one of the connecting plates, and the other end of the first opening is fixedly connected to the other end of the second opening through the other connecting plate. Furthermore, the inner diameter of the first cylinder is larger than the inner diameter of the second cylinder.

[0007] Preferably, the first mounting plate is fixedly disposed at the bottom end of the first cylinder, the second mounting plate is fixedly disposed at the top end of the second cylinder, and the third mounting plate is fixedly disposed at the middle part of the second cylinder.

[0008] Preferably, the upper surface of the first mounting plate is an inclined surface, and the inclination angle of the upper surface of the first mounting plate is determined by the angle and attitude of the primary mirror; the lower surface of the second mounting plate is an inclined surface, and the inclination angle of the lower surface of the second mounting plate is determined by the angle and attitude of the secondary mirror.

[0009] Preferably, the edge connecting the first mounting plate to the support cylinder is serrated; the edge connecting the second mounting plate to the support cylinder is serrated.

[0010] The present invention also provides a molding die for the above-mentioned primary and secondary mirror support structure, comprising an inner mold assembly, an upper outer mold, a middle outer mold, and a lower outer mold; The outer surface shape and size of the inner mold assembly are the same as the inner surface shape and size of the support cylinder; the inner mold assembly includes an inner mold body, a first module and a second module, the first module and the second module are respectively detachably embedded in the surface of the inner mold body, the shape and size of the first module are the same as the shape and size of the first mounting plate, and the shape and size of the second module are the same as the shape and size of the second mounting plate; The upper outer mold, the middle outer mold, and the lower outer mold are detachably connected to the inner mold body, the first module is located between the lower outer mold and the inner mold body, and the second module is located between the upper outer mold and the inner mold body; A cavity for forming the second mounting plate is formed between the upper outer mold, the inner mold body, and the continuous carbon fiber preform wound on the inner mold body; a cavity for forming the mounting ring and the third mounting plate is formed between the middle outer mold, the inner mold body, and the continuous carbon fiber preform; a cavity for forming the first mounting plate is formed between the lower outer mold, the inner mold body, and the continuous carbon fiber preform; the molding die is made of a high-temperature resistant water-soluble material.

[0011] Preferably, the outer and middle molds include a first mounting ring module, a second mounting ring module, an intermediate module, and a bracket, wherein the first mounting ring module, the second mounting ring module, and the intermediate module are respectively fixedly connected to the bracket; A cavity for forming the mounting ring is formed between the first mounting ring module, the second mounting ring module, and the continuous carbon fiber preform; a cavity for forming the third mounting plate is formed between the intermediate module, the inner mold body, and the continuous carbon fiber preform.

[0012] Preferably, the inner mold body is provided with a toothed structure that engages with the toothed edge of the first module and a toothed structure that engages with the toothed edge of the second module.

[0013] The present invention also provides a molding method for a primary and secondary mirror support structure, used to manufacture the above-mentioned primary and secondary mirror support structure, based on the above-mentioned molding mold, including the following steps: S1. A continuous carbon fiber preform of the support cylinder is formed on the inner mold assembly by a wet winding process; S2. Perform local pre-curing treatment on the continuous carbon fiber preform around the first module and the second module, and then remove the first module and the second module; S3. Install the upper outer mold, the middle outer mold, and the lower outer mold; S4. Short-cut carbon fiber composite material is injected into the cavity formed by the upper outer mold, the middle outer mold and the lower outer mold to form the first mounting plate, the second mounting plate, the third mounting plate and the mounting ring; S5. Perform overall curing treatment to obtain an integrally formed carbon fiber composite primary and secondary mirror support structure. S6. The molding mold and the obtained carbon fiber composite primary and secondary mirror support structure are dissolved by soaking the molding mold in hot water; S7. The obtained carbon fiber composite primary and secondary mirror support structure is precision machined and assembled.

[0014] Preferably, in step S4, a pressure of 0.5 MPa to 1.5 MPa is applied after injecting the short-cut carbon fiber composite material.

[0015] The present invention achieves the following technical effects compared to the prior art: The primary and secondary mirror support structure provided by this invention features lighter weight, higher strength, better fatigue resistance, and a lower coefficient of thermal expansion, effectively improving the overall performance of the primary and secondary mirror support structure. The main body of the primary and secondary mirror support structure is made of continuous carbon fiber composite material, while short-cut carbon fiber composite material is used for the parts requiring assembly. It is manufactured using an integrated molding method, effectively avoiding the use of metal embedded parts, improving the accuracy and stability of the device, and reducing weight. The molding mold and method for the carbon fiber composite primary and secondary mirror support structure provided by this invention enable integrated molding of the primary and secondary mirror support structure, eliminating the need for separate molding of individual components and subsequent assembly, improving molding efficiency and accuracy, shortening the production cycle, and effectively reducing production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the primary and secondary mirror support structure according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the primary and secondary mirror support structure after the support cylinder is removed, according to Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the molding die according to Embodiment 2 of the present invention; Figure 4 This is a partial structural diagram of the molding die according to Embodiment 2 of the present invention. Figure 5A schematic diagram of the structure of the inner and outer molds of the molding die in Embodiment 2 of the present invention; Figure 6 Flowchart of the molding method in Embodiment 3 of the present invention; In the diagram: 101, support cylinder; 102, mounting ring; 103, second mounting plate; 104, focusing mechanism; 105, secondary lens; 106, third mounting plate; 107, primary lens; 108, first mounting plate; 1011, light transmission hole; 201, inner mold assembly; 202, upper outer mold; 203, injection nozzle; 204, middle outer mold; 205, lower outer mold; 2011, inner mold body; 2012, second module; 2013, third module; 2014, first module; 2041, first mounting ring module; 2042, second mounting ring module; 2043, intermediate module; 2044, bracket. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide a primary and secondary mirror support structure, molding die, and method to solve the problems existing in the prior art and improve the installation accuracy and stability of the primary and secondary mirror support structure.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figures 1 to 2As shown, this embodiment provides a primary and secondary mirror support structure, including a support cylinder 101, a mounting ring 102, a first mounting plate 108, a second mounting plate 103, and a third mounting plate 106. The mounting ring 102 is fixedly sleeved on the support cylinder 101, and the first mounting plate 108, the second mounting plate 103, and the third mounting plate 106 are respectively fixedly disposed inside the support cylinder 101. The first mounting plate 108 is used to mount the primary mirror 107, and the second mounting plate 103 is used to mount the focusing mechanism 104 of the secondary mirror 105. The secondary mirror 105 and the focusing mechanism... The output end of mechanism 104 is fixedly connected; the primary mirror 107 mounted on the first mounting plate 108 and the secondary mirror 105 mounted on the focusing mechanism 104 mounted on the second mounting plate 103 are both located inside the support cylinder 101. The secondary mirror 105 mounted on the focusing mechanism 104 mounted on the second mounting plate 103 is always spaced from the inner wall of the support cylinder 101 within the adjustment range. The focusing mechanism 104 is used to adjust the spatial position of the secondary mirror 105 to achieve focusing of the system beam; the third mounting plate 106 is used to mount optical elements. The support cylinder 101 has two opposing light-transmitting holes 1011 on its side wall. Each light-transmitting hole 1011 penetrates the side wall of the support cylinder 101, and both light-transmitting holes 1011 are used for the passage of the system beam. The support cylinder 101, mounting ring 102, first mounting plate 108, second mounting plate 103 and third mounting plate 106 are integrally formed; The support cylinder 101 is made of continuous carbon fiber composite material, while the mounting ring 102, the first mounting plate 108, the second mounting plate 103, and the third mounting plate 106 are made of chopped carbon fiber composite material.

[0022] The primary and secondary mirror support structure provided in this embodiment is made entirely of carbon fiber composite material, without any metal embedded parts. It features lighter weight, higher strength, better fatigue resistance, and a low coefficient of thermal expansion, effectively improving the overall performance of the primary and secondary mirror support structure. The main body (i.e., support cylinder 101) is made of continuous carbon fiber composite material, while the parts that need to be assembled (such as mounting ring 102, first mounting plate 108, second mounting plate 103, and third mounting plate 106) are made of chopped carbon fiber composite material and manufactured using an integrated molding method. This effectively avoids the use of metal embedded parts, improves the accuracy and stability of the device, and also reduces weight.

[0023] In this embodiment, the support cylinder 101 includes a first cylinder, a second cylinder, and two connecting plates. Both the first and second cylinders are circumferentially non-closed cylinders. The circumferential sidewall of the first cylinder is provided with a first opening that extends through the axial direction, and the circumferential sidewall of the second cylinder is provided with a second opening that extends through the axial direction. One end of the first opening is fixedly connected to one end of the second opening through a connecting plate, and the other end of the first opening is fixedly connected to the other end of the second opening through another connecting plate. Furthermore, the inner diameter of the first cylinder is larger than the inner diameter of the second cylinder.

[0024] It is worth noting that in practical applications, the specific form of the support cylinder 101 is not limited to the specific form in this embodiment. On the premise that the support cylinder 101 can accommodate the first mounting plate 108, the second mounting plate 103, the third mounting plate 106, the primary mirror 107, the focusing mechanism 104, the secondary mirror 105 and optical elements and ensure that these parts can work normally, the support cylinder 101 can be set to other shapes, which are also within the protection scope of this invention.

[0025] In the optional scheme of this embodiment, it is more preferred that the first mounting plate 108 is fixedly disposed at the bottom end of the first cylinder, the second mounting plate 103 is fixedly disposed at the top end of the second cylinder, and the third mounting plate 106 is fixedly disposed at the middle part of the second cylinder; the inner diameter of the first cylinder is determined by the size of the primary mirror 107, the inner diameter of the second cylinder is determined by the size of the secondary mirror 105, and the distance between the first cylinder and the second cylinder is determined by the distance between the secondary mirror 105 and the primary mirror 107. The inner diameter of the support cylinder 101 is larger than the maximum envelope range of the primary mirror 107 and the secondary mirror 105 combined. For example, in this embodiment, the radius of the smaller arc on the support cylinder 101 is 105mm, the radius of the larger arc is 240mm, the horizontal distance between the two arcs is 330mm, and the height is 872mm. The installation position of the third mounting plate 106 is determined by the optical path of the optical design scheme. For example, in this embodiment, the distance between the third mounting plate 106 and the bottom surface of the support cylinder 101 is 350mm. According to the optical design and installation requirements, four threaded holes are precision machined on the third mounting plate 106 for fixing and installing optical elements.

[0026] In the optional solutions of this embodiment, a preferred embodiment is that the upper surface of the first mounting plate 108 is an inclined surface, and the inclination angle of the upper surface of the first mounting plate 108 is determined by the angle and posture of the primary mirror 107. For example, in this embodiment, the angle between the lower surface of the second mounting plate 103 and the horizontal plane is 15°. According to the installation requirements, four threaded holes are precision machined on the second mounting plate 103 for fixing the focusing mechanism 104. The lower surface of the second mounting plate 103 is an inclined surface, and the inclination angle of the lower surface of the second mounting plate 103 is determined by the angle and posture of the secondary mirror 105. For example, in this embodiment, the angle between the upper surface of the first mounting plate 108 and the horizontal plane is 15°. According to the installation requirements of the primary mirror 107, a precision mating surface with a roughness Ra of 0.4 is precision machined on the first mounting plate 108 for adhesive bonding of the primary mirror 107.

[0027] In the optional embodiments of this example, it is more preferred that the edge connecting the first mounting plate 108 and the support cylinder 101 is serrated; the edge connecting the second mounting plate 103 and the support cylinder 101 is serrated.

[0028] In practical applications, the dimensions and spatial positions of the secondary mirror 105 and the primary mirror 107 are determined by the optical design scheme. For example, in this embodiment, the diameter of the secondary mirror 105 is 90mm, and the angle between its optical surface and the horizontal plane is 15°. The diameter of the primary mirror 107 is 198mm, the optical axis of the primary mirror 107 is parallel to the optical axis of the secondary mirror 105, the horizontal distance between their optical axes is 325mm, and the maximum distance between them is 690mm.

[0029] In the optional solutions of this embodiment, it is more preferred that the support cylinder 101 is made by a wet winding process of continuous carbon fiber; for example, in this embodiment, T700 grade continuous carbon fiber bundles are used, the wet winding layup design is [±45 / 0 / 90 / 90 / 0 / ±45], and the matrix material is epoxy resin.

[0030] In this embodiment, the matrix material of all chopped carbon fiber composite materials is epoxy resin, and the length of the chopped carbon fibers is 0.1mm~0.5mm.

[0031] According to the installation requirements of the primary and secondary mirror support structure and the external device, the mounting ring 102 is precision machined with features such as threaded holes and mating surfaces for assembly with the external device; for example, in this embodiment, six threaded through holes are uniformly machined upward on the mounting ring 102 for assembly with the external device.

[0032] Example 2 like Figures 2 to 5 As shown, this embodiment provides a molding die for a primary and secondary mirror support structure according to Embodiment 1, including an inner mold assembly 201, an upper outer mold 202, a middle outer mold 204, and a lower outer mold 205; The outer surface shape and size of the inner mold assembly 201 are consistent with the inner surface shape and size of the support cylinder 101. The support cylinder 101 is made by continuously winding carbon fiber on the outside of the inner mold assembly 201. The inner mold assembly 201 includes an inner mold body 2011, a first module 2014 and a second module 2012. The first module 2014 and the second module 2012 are detachably embedded on the surface of the inner mold body 2011. The shape and size of the first module 2014 are consistent with the shape and size of the first mounting plate 108, and the shape and size of the second module 2012 are consistent with the shape and size of the second mounting plate 103. A third module 2013 is also provided on the inner mold body. The third module 2013 is used to reserve a light-transmitting hole 1011 during continuous carbon fiber winding.

[0033] The upper outer mold 202, the middle outer mold 204 and the lower outer mold 205 are detachably connected to the inner mold body 2011. The first module 2014 is located between the lower outer mold 205 and the inner mold body 2011, and the second module 2012 is located between the upper outer mold 202 and the inner mold body 2011. After removing the second module 2012, a cavity for filling and molding the second mounting plate 103 is formed between the upper outer mold 202, the inner mold body 2011, and the continuous carbon fiber preform wound on the inner mold body 2011. An injection nozzle 203 is installed on the top of the upper outer mold 202 for injecting short-cut carbon fiber composite material. After removing the second module 2012, in order to prevent the continuous carbon fiber wound on the inner mold body 2011 from collapsing and deforming, the edge of the second module 2012 is set with a uniformly distributed toothed structure, and a toothed structure that meshes with the toothed edge of the second module 2012 is set at the corresponding position of the inner mold body 2011. A cavity for filling and molding the mounting ring 102 and the third mounting plate 106 is formed between the middle outer mold 204, the inner mold body 2011, and the continuous carbon fiber preform. After removing the third module 2013, a cavity is formed between the lower outer mold 205, the inner mold body 2011, and the continuous carbon fiber preform for filling and molding the first mounting plate 108. An injection nozzle 203 is installed at the bottom of the lower outer mold 205 for injecting short-cut carbon fiber composite material. After removing the first module 2014, in order to prevent the continuous carbon fiber wrapped on the inner mold body 2011 from collapsing and deforming, the edge of the first module 2014 is set as a uniformly distributed toothed structure, and a toothed structure that meshes with the toothed edge of the first module 2014 is set at the corresponding position of the inner mold body 2011. In this embodiment, the entire molding mold is made of high-temperature resistant water-soluble material so that the molding mold can be removed by soaking in hot water after the primary and secondary mirror support structure product is molded.

[0034] In the optional solutions of this embodiment, the preferred embodiment is that the outer mold 204 includes a first mounting ring module 2041, a second mounting ring module 2042, an intermediate module 2043 and a bracket 2044, and the first mounting ring module 2041, the second mounting ring module 2042 and the intermediate module 2043 are respectively fixedly connected to the bracket 2044. A cavity for filling and molding the mounting ring 102 is formed between the first mounting ring module 2041, the second mounting ring module 2042, and the continuous carbon fiber preform. A cavity for filling and molding the third mounting plate 106 is formed between the intermediate module 2043, the inner mold body 2011, and the continuous carbon fiber preform. An injection nozzle 203 is installed on the top of the first mounting ring module 2041, the second mounting ring module 2042, and the intermediate module 2043 for injecting short-cut carbon fiber material. The first mounting ring module 2041 and the second mounting ring module 2042 are fixedly installed to each other at their end faces, and the inner surface shape formed after installation is consistent with the outer surface shape of the support cylinder 101.

[0035] In the optional solutions of this embodiment, it is more preferred that the inner mold body 2011 is provided with a toothed structure that engages with the toothed edge of the first module 2014 and a toothed structure that engages with the toothed edge of the second module 2012.

[0036] In this embodiment, the bracket 2044 consists of three columns. The columns on both sides are used for the fixed installation of the first mounting ring module 2041 and the second mounting ring module 2042. The height of the top of the columns on both sides is determined by the height of the mounting ring 102. In this embodiment, the height of the column is 295mm. The middle column of the bracket 2044 is used for the fixed installation of the middle module 2043. The height of the top of the middle column of the bracket 2044 is determined by the height of the third mounting plate 106. In this embodiment, the height of the column is 315mm. The bottom of the bracket 2044 is fixedly connected to the bottom of the inner mold body 2011.

[0037] Example 3 like Figure 6As shown, this embodiment also provides a molding method for a primary and secondary mirror support structure, used to manufacture the primary and secondary mirror support structure of Embodiment 1. Based on the molding mold of Embodiment 2, before molding, the spatial position and angular orientation of the secondary mirror 105 and the primary mirror 107, as well as the positional relationship of each optical element in the optical design scheme, are first determined according to the optical design scheme. According to the spatial position and angular orientation of the secondary mirror 105, the position of the second mounting plate 103 and the tilt angle of its lower surface are determined; according to the spatial position and angular orientation of the primary mirror 107, the position of the first mounting plate 108 and the tilt angle of its upper surface are determined; according to the positional relationship of each optical element in the optical design scheme, the position of the third mounting plate 106 is determined, thereby obtaining the molding mold. In this embodiment, the molding mold is made of Q235 steel. Then, after cleaning and drying the molding mold, a release agent is uniformly coated on the molding mold and dried to form a release layer on the surface of the molding mold. In this embodiment, polyvinyl alcohol release agent is used, which is uniformly coated and then dried at 60°C for 4 hours. The molding method in this embodiment specifically includes the following steps: S1. Install each detachable module of the inner mold assembly 201, and then use a wet winding device to impregnate the continuous carbon fiber bundle with resin and spirally wind it onto the inner mold assembly 201 to form a continuous carbon fiber preform of the support cylinder 101 (i.e., the preform of the support cylinder 101) on the inner mold assembly 201 through a wet winding process. In this embodiment, the epoxy resin temperature during impregnation is 45±2℃, and the pressure of the scraper roller is 4 bar. The fiber spacing during winding is 1.2 times the yarn width, and the tension is controlled by a gradient. S2. To prevent the continuous carbon fiber wrapped in step S1 from collapsing and deforming after the removal of the first module 2014 and the second module 2012, the continuous carbon fiber preform around the first module 2014 and the second module 2012 is locally pre-cured, so that the preform in this area reaches a gel state and can achieve self-support without the aid of additional structures. Then the first module 2014 and the second module 2012 are removed. In this embodiment, a hot air gun or infrared lamp is used to bake the local area, so that the preform in the area that needs to be pre-cured becomes a gel state, with a curing degree of about 30% to 50%. S3. Install the upper outer mold 202, the middle outer mold 204 and the lower outer mold 205, and install each injection nozzle 203; S4. The carbon fiber material and matrix material of the chopped carbon fiber composite material are consistent with those of the continuous carbon fiber composite material. After the chopped carbon fiber is fully mixed with the uncured matrix, the chopped carbon fiber composite material is injected into the cavity formed by the upper outer mold 202, the middle outer mold 204 and the lower outer mold 205 to form the first mounting plate 108, the second mounting plate 103, the third mounting plate 106 and the mounting ring 102; thus, the complete preform of the primary and secondary mirror support structure of Example 1 is obtained. In this example, the fiber volume fraction of the chopped carbon fiber is 25~55%. After filling, a pressure of 0.5~1.5MPa is applied to expel air bubbles and improve fiber density. S5. Perform overall curing treatment to obtain an integrally formed carbon fiber composite primary and secondary mirror support structure; In this embodiment, the curing temperature is stepped: first 80℃ / 2h, then 120℃ / 4h, and then 150℃ / 6h, wherein the heating rate during the heating stage is ≤1℃ / min, and the pressure of the autoclave is 2.5MPa. S6. The carbon fiber composite primary and secondary mirror support structure is obtained by soaking the molding mold and the carbon fiber composite primary and secondary mirror support structure in hot water. Since the molding mold is made of a high-temperature resistant water-soluble material, it can be dissolved in hot water. After the molding mold is dissolved, the carbon fiber composite primary and secondary mirror support structure can be taken out. S7. The obtained carbon fiber composite primary and secondary mirror support structure is precision machined and assembled.

[0038] In the optional schemes of this embodiment, it is more preferred that after step S5, the focusing mechanism 104, secondary lens 105 and primary lens 107 are installed and adjusted according to the processing requirements of the first mounting plate 108, the second mounting plate 103 and the third mounting plate 106 to meet the accuracy requirements.

[0039] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A primary and secondary mirror support structure, characterized in that: The system includes a support cylinder, a mounting ring, a first mounting plate, a second mounting plate, and a third mounting plate. The mounting ring is fixedly sleeved on the support cylinder. The first, second, and third mounting plates are respectively fixedly disposed inside the support cylinder. The first mounting plate is used to mount the primary mirror, and the second mounting plate is used to mount the focusing mechanism of the secondary mirror. The secondary mirror is fixedly connected to the output end of the focusing mechanism. The primary mirror mounted on the first mounting plate and the secondary mirror mounted on the focusing mechanism on the second mounting plate are both located inside the support cylinder. The secondary mirror mounted on the focusing mechanism on the second mounting plate is always spaced from the inner wall of the support cylinder within its adjustment range. The third mounting plate is used to mount optical elements. The support cylinder has two opposing light-transmitting holes on its side wall, and each light-transmitting hole penetrates the side wall of the support cylinder. The support cylinder, the mounting ring, the first mounting plate, the second mounting plate, and the third mounting plate are integrally formed; The support cylinder is made of continuous carbon fiber composite material, and the mounting ring, the first mounting plate, the second mounting plate and the third mounting plate are made of chopped carbon fiber composite material.

2. The primary and secondary mirror support structure according to claim 1, characterized in that: The support cylinder includes a first cylinder, a second cylinder, and two connecting plates. Both the first cylinder and the second cylinder are circumferentially non-closed cylinders. The circumferential sidewall of the first cylinder is provided with a first opening that extends axially, and the circumferential sidewall of the second cylinder is provided with a second opening that extends axially. One end of the first opening is fixedly connected to one end of the second opening through one of the connecting plates, and the other end of the first opening is fixedly connected to the other end of the second opening through the other connecting plate. Furthermore, the inner diameter of the first cylinder is larger than the inner diameter of the second cylinder.

3. The primary and secondary mirror support structure according to claim 2, characterized in that: The first mounting plate is fixedly disposed at the bottom end of the first cylinder, the second mounting plate is fixedly disposed at the top end of the second cylinder, and the third mounting plate is fixedly disposed at the middle part of the second cylinder.

4. The primary and secondary mirror support structure according to claim 1, characterized in that: The upper surface of the first mounting plate is a slope, and the tilt angle of the upper surface of the first mounting plate is determined by the angle and attitude of the primary mirror; the lower surface of the second mounting plate is a slope, and the tilt angle of the lower surface of the second mounting plate is determined by the angle and attitude of the secondary mirror.

5. The primary and secondary mirror support structure according to claim 1, characterized in that: The edge connecting the first mounting plate to the support cylinder is serrated; the edge connecting the second mounting plate to the support cylinder is serrated.

6. A molding die for the primary and secondary mirror support structure according to any one of claims 1-5, characterized in that: It includes an inner mold assembly, an upper outer mold, a middle outer mold, and a lower outer mold; The outer surface shape and size of the inner mold assembly are the same as the inner surface shape and size of the support cylinder; the inner mold assembly includes an inner mold body, a first module and a second module, the first module and the second module are respectively detachably embedded in the surface of the inner mold body, the shape and size of the first module are the same as the shape and size of the first mounting plate, and the shape and size of the second module are the same as the shape and size of the second mounting plate; The upper outer mold, the middle outer mold, and the lower outer mold are detachably connected to the inner mold body, the first module is located between the lower outer mold and the inner mold body, and the second module is located between the upper outer mold and the inner mold body; A cavity for forming the second mounting plate is formed between the upper outer mold, the inner mold body, and the continuous carbon fiber preform wound on the inner mold body; a cavity for forming the mounting ring and the third mounting plate is formed between the middle outer mold, the inner mold body, and the continuous carbon fiber preform; a cavity for forming the first mounting plate is formed between the lower outer mold, the inner mold body, and the continuous carbon fiber preform; the molding die is made of a high-temperature resistant water-soluble material.

7. The molding die according to claim 6, characterized in that: The outer and middle molds include a first mounting ring module, a second mounting ring module, an intermediate module, and a bracket, wherein the first mounting ring module, the second mounting ring module, and the intermediate module are respectively fixedly connected to the bracket; A cavity for forming the mounting ring is formed between the first mounting ring module, the second mounting ring module, and the continuous carbon fiber preform; a cavity for forming the third mounting plate is formed between the intermediate module, the inner mold body, and the continuous carbon fiber preform.

8. The molding die according to claim 6, characterized in that: The inner mold body is provided with a toothed structure that engages with the toothed edge of the first module and a toothed structure that engages with the toothed edge of the second module.

9. A method for forming a primary and secondary mirror support structure, used to manufacture the primary and secondary mirror support structure according to any one of claims 1-5, characterized in that, Based on the molding die according to any one of claims 6-8, the process includes the following steps: S1. A continuous carbon fiber preform of the support cylinder is formed on the inner mold assembly by a wet winding process; S2. Perform local pre-curing treatment on the continuous carbon fiber preform around the first module and the second module, and then remove the first module and the second module; S3. Install the upper outer mold, the middle outer mold, and the lower outer mold; S4. Short-cut carbon fiber composite material is injected into the cavity formed by the upper outer mold, the middle outer mold and the lower outer mold to form the first mounting plate, the second mounting plate, the third mounting plate and the mounting ring; S5. Perform overall curing treatment to obtain an integrally formed carbon fiber composite primary and secondary mirror support structure. S6. The molding mold and the obtained carbon fiber composite primary and secondary mirror support structure are dissolved by soaking the molding mold in hot water; S7. The obtained carbon fiber composite primary and secondary mirror support structure is precision machined and assembled.

10. The molding method of the primary and secondary mirror support structure according to claim 9, characterized in that: In step S4, a pressure of 0.5 MPa to 1.5 MPa is applied after injecting the short-cut carbon fiber composite material.

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