A lightweight spaceborne two-dimensional pointing mechanism main frame and two-dimensional pointing mechanism

Abstract

This invention discloses a lightweight two-dimensional pointing mechanism main frame and two-dimensional pointing mechanism for spaceborne applications, relating to the field of space pointing mechanisms. It includes a base, a fixed joint, a first rotating frame, a second rotating frame, a first drive source, a second drive source, and a feed net assembly. The fixed joint includes a fixed plate and a fixed lug plate. The first rotating frame includes an upper lug plate, a lower lug plate, and a first base plate. The second rotating frame includes a connecting lug plate and a second base plate. The connecting lug plate is rotatably connected to the upper lug plate, and the second base plate is fixed to the connecting lug plate. The first drive source is fixed to the fixed lug plate and located on the lower lug plate away from a first mounting space. The second drive source is fixed to the upper lug plate and located on the second lug plate away from a second mounting space. The feed net assembly is disposed within the first and second mounting spaces. This application effectively improves the problems of excessive mass, small unfolding / folding ratio, and high consumption of satellite resources in two-dimensional pointing mechanisms.

Description

Technical Field

[0001] This application relates to the field of space pointing mechanisms, and in particular to a lightweight spaceborne two-dimensional pointing mechanism main frame and two-dimensional pointing mechanism. Background Technology

[0002] With the continuous development of space technology, communication technology, and optoelectronic technology in the aerospace field, key technology demands such as space positioning, high-speed data transmission, and photoelectric aiming have gradually emerged. Spaceborne two-dimensional pointing mechanisms, possessing two degrees of freedom in space pointing capabilities, are widely used to address these key technology demands due to their stability and high efficiency.

[0003] Common spaceborne two-dimensional pointing mechanisms can be classified into azimuth-pitch type and XY type according to their mechanism principle. The former, azimuth-pitch type, has a small structural mass and high structural accuracy, but there is a blind zone near the zenith. The latter, XY type, does not have a blind zone, but under the premise of the same range of motion, it is less compact and has a larger mass than the former.

[0004] Currently, most two-dimensional pointing mechanisms in the aerospace field are used in non-commercial applications, and they achieve a certain level in terms of pointing function, pointing accuracy, and pointing range. However, these two-dimensional pointing mechanisms often cannot be directly applied to the commercial aerospace field due to their excessive mass, small unfolding / folding ratio, and high consumption of satellite resources. Summary of the Invention

[0005] To address the aforementioned issues and mitigate the problems of excessive mass, small expansion / contraction ratio, and high consumption of satellite resources in two-dimensional pointing mechanisms, this application provides a lightweight satellite-borne two-dimensional pointing mechanism main frame and two-dimensional pointing mechanism.

[0006] To solve the above problems, the technical solution of this invention application is as follows:

[0007] A lightweight, spaceborne two-dimensional pointing mechanism main frame, comprising:

[0008] Base;

[0009] A fixed joint is provided on the base; the fixed joint includes a fixed plate and a fixed ear plate, the fixed plate is provided on the base, and the fixed ear plate is fixed to the side of the fixed plate away from the base;

[0010] A first rotating frame is disposed on the fixed ear plate; the first rotating frame includes an upper ear plate, a lower ear plate, and a first base plate; the lower ear plate is rotatably connected to the fixed ear plate, the first base plate is fixed to the lower ear plate, and the upper ear plate is fixed to the side wall of the first base plate away from the lower ear plate; the axis of the lower ear plate around the fixed ear plate is defined as the X-axis;

[0011] A second rotating frame is disposed on the upper ear plate; the second rotating frame includes a connecting ear plate and a second base plate; the connecting ear plate is rotatably connected to the upper ear plate, and the second base plate is fixed to the connecting ear plate; the axis of the connecting ear plate around the upper ear plate is defined as the Y-axis; wherein the X-axis and the Y-axis are perpendicular to each other;

[0012] By definition, a first mounting space is formed between the fixed plate, the lower ear plate, and the first base plate, and a second mounting space is formed between the first base plate, the upper ear plate, and the second base plate;

[0013] A first driving source is fixed to the fixed ear plate and located on the lower ear plate away from the first mounting space. The output shaft of the first driving source is fixed to the lower ear plate and drives the lower ear plate to rotate around the X-axis.

[0014] The second drive source is fixed on the upper ear plate and located on the upper ear plate away from the second mounting space. The output shaft of the second drive source is fixed on the connecting ear plate and drives the connecting ear plate to rotate around the Y axis.

[0015] A feeder assembly for transmitting high-frequency electrical signals is disposed within the first mounting space and the second mounting space.

[0016] In the main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention, the first drive source and the second drive source are respectively a first drive motor and a second drive motor.

[0017] The rotation angle of both the first drive motor and the second drive motor is 'a', and the value of 'a' ranges from [-90°, 70°].

[0018] The first drive motor rotates toward the external pressing component and retracts.

[0019] The main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention has a lower mounting ring provided on the first base plate, the lower mounting ring being located in the first mounting space, and an upper mounting ring provided on the first base plate, the upper mounting ring being located in the second mounting space;

[0020] The feed grid assembly includes a first rotary joint, a second rotary joint, a waveguide, and a wave converter;

[0021] The first rotary joint is fixed to the lower mounting ring, and the second rotary joint is fixed to the upper mounting ring; the waveguide is connected to the first rotary joint and the second rotary joint, and the waveguide converter is disposed on the base and connected to the second rotary joint.

[0022] The main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention has a plurality of process holes on both the first base plate and the second base plate for cable arrangement of the first drive source and the second drive source.

[0023] The main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention has the central axis of the upper mounting ring and the central axis of the second rotating shaft coaxially arranged, and the central axis of the lower mounting ring and the central axis of the first rotating shaft coaxially arranged.

[0024] The main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention has a hollow base design.

[0025] The main frame of the spaceborne lightweight two-dimensional pointing mechanism of the present invention has a heat insulation pad provided between the fixing plate and the base.

[0026] A two-dimensional pointing mechanism, comprising the aforementioned lightweight spaceborne two-dimensional pointing mechanism main frame;

[0027] A reflective surface assembly is disposed on the second base plate, and the feed mesh assembly is connected to the reflective surface assembly;

[0028] A clamping assembly includes a clamping part and a releasing part; the clamping part is disposed on a base, and the releasing part is disposed on a second base plate.

[0029] The two-dimensional pointing mechanism of the present invention includes a load transfer component disposed between the second base plate and the reflective surface assembly; the reflective surface assembly includes a main reflective surface, a secondary reflective surface, a plurality of support rods, and a connecting sleeve.

[0030] The main reflective surface is disposed on the connecting sleeve, the first ends of the plurality of support rods are all fixed to the working surface of the main reflective surface, the second ends of the plurality of support rods are all fixed to the secondary reflective surface, the plurality of support rods surround the connecting sleeve, and one end of the connecting sleeve is fixed to the load adapter.

[0031] The clamping part includes a clamping frame and a first pyrotechnic component. The clamping frame is fixed to the base, and the first pyrotechnic component is disposed inside the clamping frame. The releasing part includes a releasing frame and a second pyrotechnic component. The releasing frame is fixed to the second base plate and is on the same side as the clamping frame, and the second pyrotechnic component is disposed inside the releasing frame. The first pyrotechnic component and the second pyrotechnic component are connected to achieve a retracted state.

[0032] The two-dimensional pointing mechanism of the present invention has an electrical interface on the base, which is electrically connected to a plurality of cables of the first driving source and the second driving source.

[0033] Because of the above technical solutions, this invention application has the following advantages and positive effects compared with the prior art:

[0034] In this application, the rotation of the first base plate is achieved by rotating the lower ear plate through the first drive source, and is achieved through only one lower ear plate. Compared with the prior art, the single-arm support and rotation achieved by using one lower ear plate reduces the need for more parts, thereby reducing the overall mass and volume. The rotation of the second base plate is achieved by rotating the connecting ear plate through the second drive source, and is achieved through only one connecting ear plate and one upper ear plate. Compared with the prior art, the single-arm support and rotation achieved by using the connecting ear plate and the upper ear plate also achieves the effect of reducing the overall mass and volume.

[0035] Since the design of a single arm needs to take into account the problem of eccentricity after it is deployed, the stability of the overall pointing main structure after deployment is improved by the reasonable arrangement of the first drive source, the second drive source and the feed grid assembly.

[0036] The output shaft of the first drive source becomes the rotation shaft between the fixed ear plate and the lower ear plate, and the output shaft of the second drive source becomes the rotation shaft between the upper ear plate and the connecting ear plate, further reducing the number of components and lowering the overall weight of the device.

[0037] Second, through the cooperation of the first drive motor and the second drive motor, the pointing main structure is rotated and folded twice, resulting in a smaller envelope area after folding, a larger unfolding-folding ratio, and strong folding strength.

[0038] Third, process holes are provided on both the first and second base plates, and the base is hollowed out. This is to reduce the overall weight of the main structure and to facilitate the arrangement of cables.

[0039] Fourth, since the lower ear plate, upper ear plate and connecting ear plate all adopt a single-arm design, the first installation space and the second installation space are set with an opening at one end, which facilitates the installation of components.

[0040] V. The base, fixed joint, first rotating frame, and second rotating frame can be replaced according to specific circumstances.

[0041] VI. The load adapter ensures that reflective components with different loads can be mounted, making the design versatile.

[0042] 7. The clamping component is a single-point design, pointing towards the main structure and clamping it to the side. Only a single clamping component needs to be detonated, which reduces the impact of pyrotechnic detonation, avoids detonation timing issues, and saves the resources of the entire satellite. Attached Figure Description

[0043] Figure 1This embodiment presents a schematic diagram of the overall unfolded structure of the main frame of the lightweight two-dimensional pointing mechanism onboard spacecraft.

[0044] Figure 2 This embodiment presents a schematic diagram of the overall structure of the lightweight two-dimensional pointing mechanism's main frame that is folded up.

[0045] Figure 3 This embodiment shows a structural diagram of the fixed joint, the first rotary joint, and the second rotary joint of the main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications.

[0046] Figure 4 This embodiment shows a schematic diagram of the feed grid assembly structure of the main frame of the lightweight two-dimensional pointing mechanism on a spacecraft.

[0047] Figure 5 Schematic diagram of the emitting surface structure of the two-dimensional pointing mechanism in this embodiment.

[0048] Figure 6 This embodiment presents a schematic diagram of the pressing component structure of the two-dimensional pointing mechanism.

[0049] Explanation of reference numerals in the attached drawings: 1. Base; 2. Fixing plate; 3. Fixing ear plate; 4. Upper ear plate; 5. Lower ear plate; 6. First base plate; 7. Connecting ear plate; 8. Second base plate; 9. First drive source; 10. Second drive source; 11. Lower mounting ring; 12. Upper mounting ring; 13. First rotary joint; 14. Second rotary joint; 15. Waveguide; 16. Waveform converter; 17. Process hole; 18. Primary reflector; 19. Secondary reflector; 20. Support rod; 21. Connecting sleeve; 22. Load adapter; 23. Clamping frame; 24. First pyrotechnic device; 25. Release frame; 26. Second pyrotechnic device; 27. Heat insulation pad. Detailed Implementation

[0050] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a lightweight, spaceborne two-dimensional pointing mechanism main frame and two-dimensional pointing mechanism as proposed in this application. The advantages and features of this application will become clearer from the following description and claims.

[0051] Example 1:

[0052] See Figure 1 , Figure 2 and Figure 3 This application provides a lightweight two-dimensional pointing mechanism main frame for spaceborne applications, including a base 1, a fixed joint, a first rotating frame, a second rotating frame, a first drive source 9, a second drive source 10, and a feed grid assembly.

[0053] The fixed joint is mounted on the base 1; the fixed joint includes a fixed plate 2 and a fixed ear plate 3, the fixed plate 2 is mounted on the base 1, and the fixed ear plate 3 is fixed to the side of the fixed plate 2 away from the base 1;

[0054] The first rotary joint 13 is disposed on the fixed ear plate 3; the first rotary joint 13 includes an upper ear plate 4, a lower ear plate 5 and a first base plate 6; the lower ear plate 5 is rotatably connected to the fixed ear plate 3, the first base plate 6 is fixed to the lower ear plate 5, and the upper ear plate 4 is fixed to the side arm of the first base plate 6 away from the lower ear plate 5; the lower ear plate 5 is defined as the X-axis around the axis of the fixed ear plate 3.

[0055] The second rotary joint 14 is disposed on the upper ear plate 4; the second rotary joint 14 includes a connecting ear plate 7 and a second base plate 8; the connecting ear plate 7 is rotatably connected to the upper ear plate 4, and the second base plate 8 is fixed to the connecting ear plate 7; the axis of the connecting ear plate 7 around the upper ear plate 4 is defined as the Y-axis; wherein, the X-axis and the Y-axis are perpendicular to each other.

[0056] The first mounting space is formed between the fixed plate 2, the lower ear plate 5 and the first base plate 6, and the second mounting space is formed between the first base plate 6, the upper ear plate 4 and the second base plate 8.

[0057] The first drive source 9 is fixed on the fixed ear plate 3 and located on the lower ear plate 5 away from the first mounting space. The output shaft of the first drive source 9 is fixed on the lower ear plate 5 and drives the lower ear plate 5 to rotate around the X-axis. The second drive source 10 is fixed on the upper ear plate 4 and located on the upper ear plate 4 away from the second mounting space. The output shaft of the second drive source 10 is fixed on the connecting ear plate 7 and drives the connecting ear plate 7 to rotate around the Y-axis.

[0058] A feeder assembly for transmitting high-frequency electrical signals is disposed within the first mounting space and the second mounting space.

[0059] To further explain, the rotation of the first base plate 6 is achieved by rotating the lower ear plate 5 through the first drive source 9, and is achieved through only one lower ear plate 5. Compared with the prior art, the single-arm support and rotation achieved by using one lower ear plate 5 can reduce the need for more parts, thereby reducing the overall mass and volume. The rotation of the second base plate 8 is achieved by rotating the connecting ear plate 7 through the second drive source 10, and is achieved through only one connecting ear plate 7 and one upper ear plate 5. Compared with the prior art, the single-arm support and rotation achieved by using one connecting ear plate 7 and one upper ear plate 5 also achieves the effect of reducing the overall mass and volume.

[0060] Since the design of a single arm needs to take into account its eccentricity, the stability of the pointing main structure after overall deployment is improved by the reasonable arrangement of the first drive source 9, the second drive source 10 and the feed grid assembly.

[0061] The output shaft of the first drive source 9 becomes the rotation shaft between the fixed ear plate 3 and the lower ear plate 5, and the output shaft of the second drive source 10 becomes the rotation shaft between the upper ear plate 4 and the connecting ear plate 7, further reducing the practicality of the components and lowering the overall weight of the device.

[0062] Since the lower ear plate 5, the upper ear plate 4 and the connecting ear plate 7 all adopt a single-arm design, the first installation space and the second installation space are open at one end, which facilitates the installation of components.

[0063] The following is a further explanation of the specific structure of the main frame of the lightweight two-dimensional pointing mechanism onboard in this embodiment:

[0064] Reference Figure 1 and Figure 3 In this embodiment, the first drive source 9 and the second drive source 10 are the first drive motor and the second drive motor, respectively.

[0065] The rotation angle of both the first drive motor and the second drive motor is 'a', and the value of 'a' ranges from [-90°, 70°].

[0066] The first drive motor rotates toward the external pressing component and retracts.

[0067] To further explain, the cooperation of the first drive motor and the second drive motor enables the pointing main structure to rotate and fold twice, resulting in a smaller envelope area after folding, a larger unfolding-folding ratio, and stronger folding strength.

[0068] When the rotation angle of the first drive motor and the second drive motor is -90°, the main structure is in a retracted state; when the rotation angle of the first drive motor and the second drive motor is 0°, the main structure is in an extended state. At this time, the fixed plate 2, the first base plate 6, and the second base plate 8 are parallel to each other. The rotation angle of the first drive motor and the second drive motor can be adjusted according to the actual situation. Moreover, since the upper ear plate 4 and the lower ear plate 5 are designed with a single arm, the rotation process is more convenient.

[0069] Reference Figure 3 In this embodiment, a lower mounting ring 11 is provided on the first base plate 6, and the lower mounting ring 11 is located in the first mounting space. An upper mounting ring 12 is provided on the first base plate 6, and the upper mounting ring 12 is located in the second mounting space.

[0070] The feed grid assembly includes a first rotary joint 13, a second rotary joint 14, a waveguide 15, and a wave converter 16.

[0071] The first rotating joint 13 is fixed to the lower mounting ring 11, and the second rotating joint 14 is fixed to the upper mounting ring 12; the waveguide 15 is connected to the first rotating joint 13 and the second rotating joint 14, and the waveguide converter 16 is disposed on the base 1 and connected to the first rotating joint 13.

[0072] Further configuration: there are two lower mounting rings 11 and two upper mounting rings 12; a first rotary joint 13 is located between the two lower mounting rings 11; and a second rotary joint 14 is located between the two upper mounting rings 12.

[0073] In a further configuration, one end of the wave-to-wave converter 16 is connected to the signal cable via an external plug, and the other end of the wave-to-wave converter 16 is connected to the two rotating arms of the second rotating joint 14; the moving end of the second rotating joint 14 is connected to the moving end of the first rotating joint 13 via a waveguide 15; the first rotating joint 13 and the second rotating joint 14 will rotate in accordance with the rotation of the first drive motor or the second drive motor to ensure the stable transmission of electrical signals.

[0074] Reference Figure 1 In this embodiment, the first base plate 6 and the second base plate 8 are each provided with a plurality of process holes 17 for the cable arrangement of the first drive source 9 and the second drive source 10.

[0075] In this embodiment, the base 1 has a hollow design.

[0076] Further, process holes 17 are provided on both the first base plate 6 and the second base plate 8, and the base 1 is hollowed out. This is to reduce the overall mass of the main structure and to facilitate the arrangement of cables.

[0077] Reference Figure 1 In this embodiment, a heat insulation pad 27 is provided between the fixing plate and the base.

[0078] The following describes the working process of the main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications in this embodiment: When the main pointing structure is folded and retracted, it is secured by an external clamping assembly (pyrotechnic kit), ensuring that the clamping assembly has sufficient rigidity to withstand vibration and impact during launch; when the clamping assembly is unlocked, the second drive motor drives the upper ear plate 4, which in turn rotates the second base plate 8 by 90°, and then the second drive motor is activated to drive the lower ear plate 5, which in turn rotates the first base plate 6 by 90°; finally, the main pointing structure is unfolded.

[0079] Of course, the rotation angles of the first and second drive motors can be adjusted according to the actual situation;

[0080] External signals pass through the wave-to-same converter 16, then through the first rotary joint 13, waveguide 15, and second rotary joint 14, and finally connect to the external reflector assembly to realize the transmission and transmission of high-frequency electrical signals.

[0081] Example 2:

[0082] See Figure 1 and Figure 5 A two-dimensional pointing mechanism includes the aforementioned lightweight spaceborne two-dimensional pointing mechanism main frame, reflector assembly, and clamping assembly.

[0083] The reflector assembly is mounted on the second base plate 8, and the feed mesh assembly is connected to the reflector assembly; the clamping assembly includes a clamping part and a releasing part; the clamping part is mounted on the base 1, and the releasing part is mounted on the second base plate 8.

[0084] In a further configuration, the second rotary joint 14 in the feed grid assembly is connected to the internal component of the connecting sleeve 21 in the reflector assembly (wherein, it is further explained that the internal component of the connecting sleeve 21 is the feed source assembly), forming a signal transmission channel.

[0085] See Figure 1 and Figure 6 In this embodiment, a load transfer member 22 is provided between the second base plate 8 and the reflective surface assembly; the reflective surface assembly includes a main reflective surface 18, a secondary reflective surface 19, a plurality of support rods 20 and a connecting sleeve 21;

[0086] The main reflective surface 18 is disposed on the connecting sleeve 21. The first ends of several support rods 20 are all fixed on the working surface of the main reflective surface 18, the second ends of several support rods 20 are all fixed on the secondary reflective surface 19, the several support rods 20 surround the connecting sleeve 21, and one end of the connecting sleeve 21 is fixed to the load adapter 22.

[0087] The clamping part includes a clamping frame 23 and a first pyrotechnic component 24 (pyrotechnic component kit cutter part). The clamping frame 23 is fixed to the base 1, and the first pyrotechnic component 24 is disposed inside the clamping frame 23. The releasing part includes a releasing frame 25 and a second pyrotechnic component 26 (pyrotechnic component kit sleeve part). The releasing frame 25 is fixed to the second base plate 8 and is on the same side as the clamping frame 23. The second pyrotechnic component 26 is disposed inside the releasing frame 25. The first pyrotechnic component 24 and the second pyrotechnic component 26 are connected to achieve a retracted state.

[0088] Furthermore, the clamping frame 23 is offset to one side of the base 1, which is mainly to ensure the connection between the clamping frame 23 and the release frame 25 in the folded state, and to ensure balance in the unfolded state.

[0089] To further explain, the load adapter 22 can be designed differently depending on the different interfaces required to carry the load.

[0090] In this embodiment, the base 1 is provided with an electrical interface, which is electrically connected to several cables of the first drive source 9 and the second drive source 10.

[0091] To further explain, the cable adopts a layout that uses twisting instead of bending, ensuring that the cable will not be damaged by repeated bending during long-term operation of the mechanism, thus ensuring the cable's service life.

[0092] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A lightweight two-dimensional pointing mechanism main frame for spaceborne applications, characterized in that, include: Base; A fixed joint is provided on the base; The fixing joint includes a fixing plate and a fixing ear plate, wherein the fixing plate is disposed on the base, and the fixing ear plate is fixed to the side of the fixing plate away from the base; A first rotating frame is disposed on the fixed ear plate; the first rotating frame includes: an upper ear plate, a lower ear plate, and a first base plate; the lower ear plate is rotatably connected to the fixed ear plate, the first base plate is fixed to the lower ear plate, and the upper ear plate is fixed to the side wall of the first base plate away from the lower ear plate; the axis of the lower ear plate around the fixed ear plate is the X-axis; A second rotating frame is disposed on the upper ear plate; the second rotating frame includes: a connecting ear plate and a second base plate; the connecting ear plate is rotatably connected to the upper ear plate, and the second base plate is fixed to the connecting ear plate; the axis of the connecting ear plate around the upper ear plate is the Y-axis; wherein, the X-axis and the Y-axis are perpendicular to each other; A first mounting space is formed between the fixed plate, the lower ear plate and the first base plate, and a second mounting space is formed between the first base plate and the upper ear plate and the second base plate; A first driving source is fixed to the fixed ear plate and located on the lower ear plate away from the first mounting space. The output shaft of the first driving source is fixed to the lower ear plate and drives the lower ear plate to rotate around the X-axis. The second drive source is fixed on the upper ear plate and located on the upper ear plate away from the second mounting space. The output shaft of the second drive source is fixed on the connecting ear plate and drives the connecting ear plate to rotate around the Y axis. A feeder assembly for transmitting high-frequency electrical signals is disposed within the first mounting space and the second mounting space; a lower mounting ring is disposed on the first base plate and is located within the first mounting space, and an upper mounting ring is disposed on the first base plate and is located within the second mounting space; The feed grid assembly includes: a first rotary joint, a second rotary joint, a waveguide, and a wave converter; The first rotary joint is fixed to the lower mounting ring, and the second rotary joint is fixed to the upper mounting ring; the waveguide is connected to the first rotary joint and the second rotary joint, and the waveguide converter is disposed on the base and connected to the second rotary joint.

2. The main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications according to claim 1, characterized in that: The first drive source and the second drive source are the first drive motor and the second drive motor, respectively; The rotation angle of both the first drive motor and the second drive motor is 'a', and the value of 'a' ranges from [-90°, 70°]. The first drive motor rotates toward the external pressing component and retracts.

3. The main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications according to claim 1, characterized in that: Both the first base plate and the second base plate have several process holes for arranging the cables of the first drive source and the second drive source.

4. The main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications according to claim 3, characterized in that: The central axis of the upper mounting ring is coaxial with the central axis of the output shaft of the second drive source, and the central axis of the lower mounting ring is coaxial with the central axis of the output shaft of the first drive source.

5. The main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications according to claim 1, characterized in that: The base has a hollow design.

6. The main frame of the lightweight two-dimensional pointing mechanism for spaceborne applications according to claim 1, characterized in that: A heat insulation pad is provided between the fixing plate and the base.

7. A two-dimensional pointing mechanism, characterized in that, include: The main frame of the spaceborne lightweight two-dimensional pointing mechanism as described in any one of claims 1 to 6 above; A reflective surface assembly is disposed on the second base plate, and the feed mesh assembly is connected to the reflective surface assembly; The clamping assembly includes: a clamping part and a releasing part; The clamping part is disposed on the base, and the releasing part is disposed on the second base plate.

8. The two-dimensional pointing mechanism according to claim 7, characterized in that: A load-bearing adapter is provided between the second base plate and the reflective surface assembly; the reflective surface assembly includes: a main reflective surface, a secondary reflective surface, several support rods, and a connecting sleeve; The main reflective surface is disposed on the connecting sleeve, the first ends of the plurality of support rods are all fixed to the working surface of the main reflective surface, the second ends of the plurality of support rods are all fixed to the secondary reflective surface, the plurality of support rods surround the connecting sleeve, and one end of the connecting sleeve is fixed to the load adapter. The clamping part includes a clamping frame and a first pyrotechnic component. The clamping frame is fixed to the base, and the first pyrotechnic component is disposed inside the clamping frame. The releasing part includes a releasing frame and a second pyrotechnic component. The releasing frame is fixed to the second base plate and is on the same side as the clamping frame, and the second pyrotechnic component is disposed inside the releasing frame. The first pyrotechnic component and the second pyrotechnic component are connected to achieve a retracted state.

9. The two-dimensional pointing mechanism according to claim 7, characterized in that: The base is provided with an electrical interface, which is electrically connected to several cables of the first drive source and the second drive source.

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