Large deployable secondary mirror device for space optical remote sensing cameras

Abstract

This invention discloses a deployable device for a large secondary mirror of a space optical remote sensing camera, comprising: several flipping mechanisms and several unfolding mechanisms; wherein the flipping mechanisms are stacked sequentially, and adjacent flipping mechanisms are connected by unfolding mechanisms; each flipping mechanism includes an upper flipping plate and a lower flipping plate; the lower end face of the unfolding mechanism is connected to the upper flipping plate of the flipping mechanism below it, and the upper end face is connected to the lower flipping plate of the flipping mechanism above it; when the flipping mechanism is unfolded, the upper and lower flipping plates are arranged vertically; when retracted, the upper and lower flipping plates are arranged parallel to each other; the unfolding direction of the unfolding mechanism can rotate 90 degrees. This invention can realize the large aperture, long focal length, lightweight, and two-dimensional planar unfolding of a space optical remote sensing camera to meet the spatial resolution requirements of remote sensing satellites in the field of space remote sensing.

Description

Technical Field

[0001] This invention relates to a deployable device for a large secondary mirror of a space optical remote sensing camera, belonging to the field of deep space exploration technology. Background Technology

[0002] With the rapid development of aerospace technology, space optical remote sensing cameras have been successfully applied in many fields such as deep space exploration, Earth observation, space science research, and resource monitoring. Their development direction is mainly towards high resolution, lightweight design, and high stability. As the resolution requirements for space optical remote sensors increase, long focal lengths, large apertures, and spatial orientation are inevitable development directions, which are clearly difficult to achieve using an integrated primary and secondary mirror.

[0003] This necessitates that the large secondary mirror of the space optical remote sensing camera be deployed by folding and collapsing its support mechanism during launch, and then sequentially deployed after entering orbit. The deployable mechanism is one crucial technological approach. It enables high precision and high compression ratios, increasing the possibility of deploying long focal lengths and large apertures for the space optical remote sensing camera in orbit. Considering the rocket's load-bearing capacity, the deployable mechanism must also be lightweight.

[0004] Furthermore, in special missions, the secondary mirror's deployable mechanism may also require a steering function. Conventional space optical remote sensing camera deployment mechanisms can only deploy in one dimension, which is insufficient for optical remote sensing cameras to perform multi-dimensional detection tasks in deep space exploration. Summary of the Invention

[0005] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and provide a large deployable secondary mirror device for space optical remote sensing cameras, which solves the problem of large size of space optical mechanisms in orbit and small volume when folded up for launch.

[0006] The technical solution of this invention is:

[0007] This invention discloses a deployable device for a large secondary mirror of a space optical remote sensing camera, comprising: several flipping mechanisms and several unfolding mechanisms; wherein, the flipping mechanisms are stacked sequentially, and adjacent flipping mechanisms are connected by unfolding mechanisms; each flipping mechanism includes a motor assembly, a drive shaft, a crank, a connecting rod, an upper flipping plate, and a lower flipping plate; the lower end face of the unfolding mechanism is connected to the upper flipping plate of the lower flipping mechanism, and the upper end face is connected to the lower flipping plate of the upper flipping mechanism; when the flipping mechanism is unfolded, the upper and lower flipping plates are arranged vertically; when retracted, the upper and lower flipping plates are arranged parallel to each other; the motor assembly provides torque to the drive shaft, driving the drive shaft to move, which in turn drives the upper flipping plate to flip through the drive crank and connecting rod; when the upper flipping plate is detected to have rotated to the correct position, the motor assembly stops working.

[0008] Furthermore, in the above-mentioned mechanism, the unfolding mechanism includes an extension mechanism and a speed control motor assembly; wherein, the extension mechanism is composed of several unfolding units connected in series; the unfolding unit is a triangular prism structure; the speed control motor assembly includes a speed control motor and a speed control rope; one end of the speed control rope is connected to the speed control motor and installed at one end of the extension mechanism; the other end of the speed control rope is connected to the other end of the extension mechanism; the speed control motor controls the release length of the speed control rope and pulls the unfolding height of the extension mechanism.

[0009] Furthermore, in the aforementioned mechanism, the unfolding unit includes a connecting frame assembly, a folding rod assembly, a spiral spring assembly, and a tension cable assembly; wherein, the spiral spring assembly is installed in the middle of the folding rod assembly to provide driving torque for the folding rod assembly; the two connecting frame assemblies are respectively the upper and lower surfaces of the triangular prism structure; the upper and lower surfaces of the triangular prism structure are connected by three folding rod assemblies to provide support; the two ends of the tension cable assembly are respectively connected to the diagonal corners of the quadrilaterals on the side of the triangular prism, and are arranged in a crisscross pattern.

[0010] Furthermore, in the above-mentioned mechanism, the connecting frame assembly includes a root hinge seat and a first carbon fiber rod; wherein there are three root hinge seats and three first carbon fiber rods, the first carbon fiber rods form a triangle, and the two ends of each first carbon fiber rod are respectively fixed to a root hinge seat.

[0011] Furthermore, in the above-mentioned mechanism, the folding rod assembly includes a root hinge and two second carbon fiber tubes; wherein the root hinge is bonded and fixed to the ends of the two second carbon fiber tubes, and the two second carbon fiber tubes are in a parallel state when folded; the root hinge is rotatably connected to the root hinge seat in the upper and lower connecting frame assemblies respectively.

[0012] Furthermore, in the aforementioned mechanism, the spiral spring assembly includes an active flap hinge, a driven flap hinge, a hinge rotation shaft, a deep groove ball bearing, a spiral spring outer end fixing shaft, a spiral spring, and a bearing cap; wherein, the hinge rotation shaft is connected to the active flap hinge via a key, and both ends of the hinge rotation shaft are respectively connected to the inner ends of two spiral springs; both the active flap hinge and the driven flap hinge are provided with rotation holes; after the hinge rotation shaft passes through the rotation holes of the active flap hinge and the driven flap hinge, it simultaneously passes through two deep groove ball bearings; the right side is axially positioned by the bearing cap, which is connected to the outer end of the driven flap hinge; the outer end of the spiral spring is fixed on the spiral spring outer end fixing shaft; the spiral spring outer end fixing shaft is connected to the driven flap hinge and is axially positioned by a set screw.

[0013] Furthermore, in the aforementioned mechanism, the tension cable assembly includes a tension cable, a tension cable hinge, a rotary shaft, and a tension cable connector; wherein, the two ends of the tension cable connector are a thick rod and a thin rod, respectively; one end of the thin rod is provided with a through hole; the thick rod is inserted into a groove provided in the middle of the tension cable hinge; the tension cable passes through the through hole of the tension cable connector, and the thin rod of the tension cable connector is deformed by pressure to clamp the tension cable; the thin end of the rotary shaft is threaded, passes through the rotary hole provided in the tension cable hinge, and is screwed into the threaded hole provided on the connecting frame assembly for fixation.

[0014] Furthermore, in the aforementioned mechanism, the speed control motor assembly includes a speed control rope steering mechanism, a roller, a spline, a speed control rope, a motor, and a mounting base. The speed control rope steering mechanism is fixed to the mounting base and has a pulley. The speed control rope changes direction after passing over the pulley and winds around the roller. The motor is connected to the mounting base. One end of the roller has a spline hole on its inner side, and the other end has a thread. One end of the spline is connected to the motor, and the other end is inserted into the spline hole of the roller. The threaded end of the roller engages with the threaded hole on the mounting base. When the motor drives the roller to rotate, the roller moves left and right along the mounting base. The position of the speed control rope after passing through the speed control rope steering mechanism remains unchanged, and the movement of the roller causes the speed control rope to wind around the roller sequentially, preventing the speed control rope from tangling or knotting.

[0015] The advantages of this invention over the prior art are as follows:

[0016] (1) The present invention can complete the long focal length deployment of the secondary mirror of the space optical remote sensing camera without the need for large control equipment, relying only on the spiral spring assembly and a small number of micro motors.

[0017] (2) The overall mass of the present invention is greatly reduced compared with the traditional large space optical remote sensing camera secondary mirror deployable mechanism.

[0018] (3) Compared with the traditional one-dimensional deployable mechanism of the secondary mirror of a large space optical remote sensing camera, the present invention is a two-dimensional planar deployment in space, which greatly increases the environmental adaptability and utilization rate of the deployable mechanism of the secondary mirror of the space optical remote sensing camera.

[0019] (4) By designing a multi-stage unfolding mechanism, the present invention adopts a hinged unfolding mechanism with small folding volume and reliable unfolding, thereby realizing the long focal length unfolding of the optical mechanism and solving the problem of large size and small folding and launching volume of the space optical mechanism in orbit. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the unfoldable device for the large secondary mirror of the space optical remote sensing camera of the present invention in its folded state.

[0021] Figure 2 This is a structural diagram of the unfolded state of the large secondary mirror unfoldable device for the space optical remote sensing camera of the present invention.

[0022] Figure 3 This is a structural diagram of the first-stage flipping mechanism of the present invention;

[0023] Figure 4 This is a structural diagram of the extension mechanism connecting frame assembly of the present invention;

[0024] Figure 5 This is a structural diagram of the folding rod assembly of the present invention;

[0025] Figure 6 This is a structural diagram of the spiral spring assembly of the present invention;

[0026] Figure 7 This is a cross-sectional view of the spiral spring assembly of the present invention;

[0027] Figure 8 This is a structural diagram of the tension cable assembly of the present invention;

[0028] Figure 9 tension cable connection structure diagram of the present invention

[0029] Figure 10 This is a structural diagram of the speed control motor assembly of the present invention. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the present invention discloses a deployable device for a large secondary mirror of a space optical remote sensing camera, comprising: a plurality of flipping mechanisms and a plurality of unfolding mechanisms; wherein, the plurality of flipping mechanisms are stacked sequentially, and adjacent flipping mechanisms are connected by unfolding mechanisms; the flipping mechanism includes an upper flipping plate 6 and a lower flipping plate 1; the lower end face of the unfolding mechanism is connected to the upper flipping plate 6 of the lower flipping mechanism, and the upper end face is connected to the lower flipping plate 1 of the upper flipping mechanism; when the flipping mechanism is unfolded, the upper flipping plate 6 and the lower flipping plate 1 are arranged vertically; when retracted, the upper flipping plate 6 and the lower flipping plate 1 are arranged parallel to each other.

[0032] Preferably, the flipping mechanism further includes a motor assembly 2, a transmission shaft 3, a crank 4, and a connecting rod 5; wherein, the motor assembly 2 provides torque to the transmission shaft 3, driving the transmission shaft 3 to move, and driving the upper flipping plate 6 to flip through the crank 4 and the connecting rod 5; when the upper flipping plate 6 is detected to have rotated to the correct position, the motor assembly 2 stops working.

[0033] Preferably, the unfolding mechanism includes an extension mechanism and a speed control motor assembly 11; wherein, the extension mechanism is composed of several unfolding units connected in series; the unfolding unit is a triangular prism structure; the speed control motor assembly 11 includes a speed control motor and a speed control rope; one end of the speed control rope is connected to the speed control motor and installed at one end of the extension mechanism; the other end of the speed control rope is connected to the other end of the extension mechanism; the speed control motor controls the release length of the speed control rope and pulls the unfolding height of the extension mechanism.

[0034] Preferably, the unfolding unit includes a connecting frame assembly 7, a folding rod assembly 8, a spiral spring assembly 9, and a tension cable assembly 10; wherein, the spiral spring assembly 9 is installed in the middle of the folding rod assembly 8 to provide driving torque for the folding rod assembly 8; the two connecting frame assemblies 7 are the upper and lower surfaces of the triangular prism structure, respectively; the upper and lower surfaces of the triangular prism structure are connected by three folding rod assemblies 8 to provide support; the two ends of the tension cable assembly 10 are respectively connected to the diagonal corners of the quadrilaterals on the side of the triangular prism, and are arranged in a crisscross pattern.

[0035] Preferably, the connecting frame assembly 7 includes a root hinge seat 12 and a first carbon fiber rod 13; wherein there are three root hinge seats 12 and three first carbon fiber rods 13, the first carbon fiber rods 13 form a triangle, and the two ends of each first carbon fiber rod 13 are respectively fixed to a root hinge seat 12.

[0036] Preferably, the folding rod assembly 8 includes a root hinge 14 and two second carbon fiber tubes 15; wherein the root hinge 14 is bonded and fixed to the ends of the two second carbon fiber tubes 15, and the two second carbon fiber tubes 15 are in a parallel state when folded; the root hinge 14 is rotatably connected to the root hinge seat 12 in the upper and lower connecting frame assembly 7.

[0037] Preferably, the spiral spring assembly 9 includes an active flap hinge 17, a driven flap hinge 16, a hinge rotation shaft 18, a deep groove ball bearing 19, a spiral spring outer end fixing shaft 20, a spiral spring 21, and a bearing cover 22; wherein, the hinge rotation shaft 18 is connected to the active flap hinge 17 via a key, and both ends of the hinge rotation shaft 18 are respectively connected to the inner ends of two spiral springs 21; both the active flap hinge 17 and the driven flap hinge 16 are provided with rotation holes; after the hinge rotation shaft 18 passes through the rotation holes of the active flap hinge 17 and the driven flap hinge 16, it simultaneously passes through two deep groove ball bearings 19; the right side is axially positioned by the bearing cover 22, which is connected to the outer end of the driven flap hinge 16; the outer end of the spiral spring 21 is fixed on the spiral spring outer end fixing shaft 20; the spiral spring outer end fixing shaft 20 is connected to the driven flap hinge 16 and is axially positioned by a set screw.

[0038] Preferably, the tension cable assembly 10 includes a tension cable 23, a tension cable hinge 24, a rotary shaft 25, and a tension cable connector 32; wherein, the two ends of the tension cable connector 32 are a thick rod and a thin rod, respectively; one end of the thin rod is provided with a through hole; the thick rod is inserted into a groove provided in the middle of the tension cable hinge 24; the tension cable 23 passes through the through hole of the tension cable connector 32, and the thin rod of the tension cable connector 32 is deformed by pressure to clamp the tension cable 23; the thin end of the rotary shaft 25 is threaded, passes through the rotary hole provided in the tension cable hinge 24, and is screwed into the threaded hole provided on the connecting frame assembly 7 for fixation.

[0039] Preferably, the speed control motor assembly 11 includes a speed control rope turning mechanism 26, a roller 27, a spline 28, a speed control rope 29, a motor 30, and a mounting base 31. The speed control rope turning mechanism 26 is fixedly connected to the mounting base 31 and has a pulley. The speed control rope 29 changes direction after passing over the pulley and winds around the roller 27. The motor 30 is connected to the mounting base 31. One end of the roller 27 has a spline hole on its inner side, and the other end has a thread. One end of the spline 28 is connected to the motor 30, and the other end is inserted into the spline hole of the roller 27. The threaded end of the roller 27 engages with the threaded hole on the mounting base 31. When the motor 30 drives the roller 27 to rotate, the roller 27 moves left and right along the mounting base 31. The position of the speed control rope 29 after passing through the speed control rope turning mechanism 26 remains unchanged. The movement of the roller 27 causes the speed control rope 29 to wind around the roller 27 sequentially, preventing the speed control rope 29 from tangling or knotting.

[0040] Example

[0041] The large deployable secondary mirror of a space optical remote sensing camera described in this embodiment combines a multi-stage flipping mechanism and a deploying mechanism to give the mechanism a large deployable size, thus enabling the long focal length deployment of the secondary mirror of the space optical remote sensing camera.

[0042] The large secondary mirror deployable device for a space optical remote sensing camera provided in this embodiment includes two main parts: a flipping unit and a deployable unit.

[0043] like Figure 1 , Figure 2 As shown, the first-level flipping mechanism, first-level unfolding mechanism, second-level flipping mechanism, second-level unfolding mechanism, and third-level flipping mechanism are stacked and connected sequentially from top to bottom; the first-level, second-level, and third-level flipping mechanisms have the same structure; the first-level and second-level unfolding mechanisms have the same structure. When the flipping mechanism is closed, the upper and lower flip plates are arranged in parallel. The unfolding mechanism consists of multiple hinged triangular prism unfolding units. The three flipping mechanisms are stacked upwards sequentially, and adjacent flipping mechanisms are connected through the unfolding mechanism, that is, the lower end face of the unfolding mechanism is connected to the upper flip plate of the flipping mechanism below, and the upper end face is connected to the lower flip plate of the flipping mechanism above. When the flipping mechanism is unfolded, the upper and lower flip plates are arranged vertically, which can change the unfolding direction of the unfolding mechanism and rotate it 90 degrees.

[0044] In the flipping unit, the first-stage flipping mechanism consists of a lower flipping plate 1, a motor assembly 2, a transmission shaft 3, a crank 4, a connecting rod 5, and an upper flipping plate 6. The motor assembly 2 provides torque to the first-stage flipping mechanism, the transmission shaft 3, the crank 4, and the connecting rod 5 transmit force to the first-stage flipping mechanism, and the upper flipping plate 6 is the object to be flipped.

[0045] The primary unfolding mechanism consists of a connecting frame assembly 7, a folding rod assembly 8, a spiral spring assembly 9, a tension cable assembly 10, and a speed control motor assembly 11.

[0046] like Figure 3 As shown, the flipping mechanism includes a lower flipping plate 1, a motor assembly 2, a transmission shaft 3, a crank 4, a connecting rod 5, and an upper flipping plate 6. The motor assembly 2 provides torque to drive the transmission shaft 3 to move, which in turn drives the upper flipping plate 6 to flip by driving the crank 4 and the connecting rod 5. When the upper flipping plate 6 is detected to have rotated to the correct position, the motor assembly 2 stops working.

[0047] like Figure 4 As shown, the connecting frame assembly 7 includes three root hinge seats 12 and three first carbon fiber rods 13. The hinge seats are distributed at the three points of a triangle, and the first carbon fiber rods 13 are located at the sides, with both ends fixed to the root hinge seats. This provides support for the extension mechanism.

[0048] like Figure 5 As shown, the folding rod assembly 8 includes a root hinge 14 and a second carbon fiber tube 15. The second carbon fiber tube 15 is bonded and fixed to the root hinge 14. When the two second carbon fiber tubes 15 are folded, they are placed parallel to each other vertically. The upper and lower root hinges 14 are respectively connected to the root hinge seats 12 in the upper and lower connecting frame assemblies 7 through a rotating joint. This provides support for the extension mechanism.

[0049] like Figure 6 , Figure 7 As shown, the spiral spring assembly 9 includes an active flap hinge 17, a driven flap hinge 16, a hinge rotation shaft 18, a deep groove ball bearing 19, a spiral spring outer end fixing shaft 20, a spiral spring 21, and a bearing cover 22. The hinge rotation shaft 18 is connected to the active flap hinge 17 via a key, and its two open ends are connected to the inner end of the spiral spring and fixed by a clamping nut. After passing through the rotation holes of the active flap hinge and the driven flap hinge, the hinge rotation shaft 18 passes through two deep groove ball bearings 19 simultaneously inside. The right side is axially positioned by the bearing cover 22, and the bearing cover is connected to the outer end of the driven flap hinge 16 by screws. The outer end of the spiral spring is fixed to the spiral spring outer end fixing shaft 20 by an internal hexagon screw. The spiral spring outer end fixing shaft 20 is connected to the driven flap and is axially positioned by a set screw.

[0050] like Figure 8 , Figure 9 As shown, the tension cable assembly 10 includes a tension cable 23, a tension cable hinge 24, a rotating shaft 25, and a tension cable connector 32. The tension cable connector 32 passes through the hole in the tension cable hinge 24. Because the diameter of the larger end of the connector is larger than the diameter of the hole, it will not protrude. The tension cable 23 passes into the hole in the tension cable connector 32. Pressure deforms the thin end of the tension cable connector 32, clamping the tension cable 23. The thin end of the rotating shaft 25 is threaded and passes through the rotating hole of the tension cable hinge 24 before being screwed into the threaded hole of the base frame for fixation. The tension cable 23 of the unfolding mechanism plays an important role in eliminating joint gaps and improving rigidity.

[0051] like Figure 10 As shown, the speed control motor assembly 11 includes a speed control rope steering mechanism 26, a roller 27, a spline 28, a speed control rope 29, a motor 30, and a mounting base 31. The speed control rope steering mechanism 26 is fixed to the mounting base. The speed control rope 29 changes direction after passing over a pulley on it and then winds around the roller 27. The motor 30 is connected to the mounting base 31 by screws, and its output end is connected to the spline 28. The other end of the spline 28 is inserted into the spline hole of the roller 27. The other end of the roller 27 has threads that engage with the threaded hole on the left end of the mounting base 31. When the motor drives the roller to rotate, the roller can move left and right along the mounting base 31. Because the position of the speed control rope 29 remains unchanged after passing through the steering mechanism, the movement of the roller allows the speed control rope 29 to wind around the roller sequentially, preventing the rope from tangling and knotting. The main function of the speed control motor assembly 11 is to control the unfolding speed of the extension mechanism, ensuring a smooth and impact-free unfolding process.

[0052] The working process of the deployable device for the large secondary mirror of a space optical remote sensing camera is as follows:

[0053] At launch, the entire mechanism is in a folded state;

[0054] After entering the track, the motor assembly 2 of the first-level flipping mechanism is controlled by the signal. The motor works and drives the transmission shaft 3 to move, which in turn drives the crank 4, connecting rod 5, and upper flipping plate 6 to flip.

[0055] After the upper flip plate 6 rotates to its position, the first-stage flipping mechanism motor assembly 2 stops working;

[0056] The motor unit of the first-stage unfolding mechanism is controlled by a signal. The motor 30 works, driving the spline 28 and the drum 27 to rotate. The speed control rope 29 begins to slowly release. At this time, the spiral spring 21 in the spiral spring assembly 9 releases its elastic potential energy; the first-stage unfolding mechanism begins to slowly unfold.

[0057] Once the primary deployment mechanism has deployed to its position, the motor unit of the primary deployment mechanism stops working. At this time, the tension cable 23 in the tension cable assembly 10 is tensioned, which plays an important role in eliminating joint gaps and improving rigidity.

[0058] The motor unit of the two-stage flipping mechanism is controlled by a signal. The motor works, drives the transmission shaft to move, and then drives the crank and connecting rod to flip the upper flipping plate.

[0059] After the upper flip plate 6 rotates to its position, the motor assembly of the secondary flipping mechanism stops working;

[0060] The motor unit of the secondary unfolding mechanism is controlled by a signal. The motor works and drives the spline and drum to rotate. The speed control rope begins to slowly release. At this time, the spiral spring in the spiral spring assembly releases its elastic potential energy, and the secondary unfolding mechanism begins to slowly unfold.

[0061] Once the secondary deployment mechanism has deployed to its position, the motor unit of the secondary deployment mechanism stops working. At this time, the tension cable in the tension cable assembly is tensioned, which plays an important role in eliminating joint gaps and improving rigidity.

[0062] The motor unit of the three-stage tilting mechanism is controlled by a signal. The motor works, drives the transmission shaft to move, and then drives the crank and connecting rod to tilt the upper tilting plate. After the upper tilting plate rotates to the position, the motor assembly of the three-stage tilting mechanism stops working.

[0063] At this point, the entire deployable mechanism of the secondary mirror of the space optical remote sensing camera has been fully deployed. This deployment mechanism completes the two-dimensional planar deployment of the secondary mirror of the space optical remote sensing camera through 3 flips and 2 unfoldings, reaching a specific position.

[0064] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

[0065] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A deployable device for a large secondary mirror of a space optical remote sensing camera, characterized in that, include: Several flipping mechanisms and several unfolding mechanisms are provided; the flipping mechanisms are stacked sequentially, and adjacent flipping mechanisms are connected by unfolding mechanisms; the flipping mechanism includes a motor assembly (2), a transmission shaft (3), a crank (4), a connecting rod (5), an upper flipping plate (6), and a lower flipping plate (1); the lower end face of the unfolding mechanism is connected to the upper flipping plate (6) of the flipping mechanism below, and the upper end face is connected to the lower flipping plate (1) of the flipping mechanism above; when the flipping mechanism is unfolded, the upper flipping plate (6) and the lower flipping plate (1) are arranged vertically; when it is folded up, the upper flipping plate (6) and the lower flipping plate (1) are arranged in parallel; the motor assembly (2) provides torque to the transmission shaft (3), drives the transmission shaft (3) to move, and drives the upper flipping plate (6) to flip through the drive crank (4) and connecting rod (5); when the upper flipping plate (6) is detected to have rotated to the correct position, the motor assembly (2) stops working; The unfolding mechanism includes an extension mechanism and a speed control motor assembly (11); wherein, the extension mechanism is composed of several unfolding units connected in series; the unfolding unit is a triangular prism structure; the speed control motor assembly (11) includes a speed control motor and a speed control rope; one end of the speed control rope is connected to the speed control motor and installed at one end of the extension mechanism; the other end of the speed control rope is connected to the other end of the extension mechanism; the speed control motor controls the release length of the speed control rope and pulls the unfolding height of the extension mechanism. The unfolding unit includes a connecting frame assembly (7), a folding rod assembly (8), a spiral spring assembly (9), and a tension cable assembly (10); wherein, the spiral spring assembly (9) is installed in the middle of the folding rod assembly (8) to provide driving torque for the folding rod assembly (8); the two connecting frame assemblies (7) are the upper and lower surfaces of the triangular prism structure respectively; the upper and lower surfaces of the triangular prism structure are connected by three folding rod assemblies (8) to provide support; the two ends of the tension cable assembly (10) are respectively connected to the diagonal corners of the quadrilaterals on the side of the triangular prism, and are arranged in a cross pattern.

2. The deployable device for a large secondary mirror of a space optical remote sensing camera according to claim 1, characterized in that: The connecting frame assembly (7) includes a root hinge seat (12) and a first carbon fiber rod (13); there are three root hinge seats (12) and three first carbon fiber rods (13), the first carbon fiber rods (13) form a triangle, and the two ends of each first carbon fiber rod (13) are respectively fixed to a root hinge seat (12).

3. The deployable device for a large secondary mirror of a space optical remote sensing camera according to claim 2, characterized in that: The folding rod assembly (8) includes a root hinge (14) and two second carbon fiber tubes (15); wherein the root hinge (14) is bonded and fixed to the ends of the two second carbon fiber tubes (15), and the two second carbon fiber tubes (15) are in a parallel state when folded; the root hinge (14) is rotatably connected to the root hinge seat (12) in the upper and lower connecting frame assembly (7).

4. The deployable device for a large secondary mirror of a space optical remote sensing camera according to claim 1, characterized in that: The spiral spring assembly (9) includes an active flap hinge (17), a driven flap hinge (16), a hinge rotation shaft (18), a deep groove ball bearing (19), a spiral spring outer end fixing shaft (20), a spiral spring (21), and a bearing cover (22); wherein, the hinge rotation shaft (18) is connected to the active flap hinge (17) by a key, and both ends of the hinge rotation shaft (18) are respectively connected to the inner ends of the two spiral springs (21); both the active flap hinge (17) and the driven flap hinge (16) are provided with a return bearing. Rotary hole; the hinge rotation shaft (18) passes through the rotation holes of the active flap hinge (17) and the driven flap hinge (16), and then passes through two deep groove ball bearings (19) inside; the right side is axially positioned by pressing with the bearing cover (22), and the bearing cover (22) is connected to the outer end of the driven flap hinge (16); the outer end of the spiral spring (21) is fixed on the outer end fixing shaft (20) of the spiral spring; the outer end fixing shaft (20) of the spiral spring is connected to the driven flap hinge (16) and is axially positioned by the set screw.

5. The deployable device for a large secondary mirror of a space optical remote sensing camera according to claim 1, characterized in that: The tension cable assembly (10) includes a tension cable (23), a tension cable hinge (24), a rotary shaft (25), and a tension cable connector (32); wherein, the two ends of the tension cable connector (32) are a thick rod and a thin rod, respectively; a through hole is provided at one end of the thin rod; the thick rod is inserted into the groove provided in the middle of the tension cable hinge (24); the tension cable (23) passes through the through hole of the tension cable connector (32), and the thin rod of the tension cable connector (32) is deformed by pressure to clamp the tension cable (23); the thin end of the rotary shaft (25) is threaded, and after passing through the rotary hole provided in the tension cable hinge (24), it is screwed into the threaded hole provided on the connecting frame assembly (7) for fixation.

6. The deployable device for a large secondary mirror of a space optical remote sensing camera according to claim 1, characterized in that: The speed control motor assembly (11) includes a speed control rope steering mechanism (26), a roller (27), a spline (28), a speed control rope (29), a motor (30), and a mounting base (31); wherein, the speed control rope steering mechanism (26) is fixedly connected to the mounting base (31) and is provided with a pulley; the speed control rope (29) changes direction after passing around the pulley and is wound around the roller (27); the motor (30) is connected to the mounting base (31); a spline hole is provided on the inner side of one end of the roller (27), and a thread is provided on the other end; the spline (28) One end of the roller (27) is connected to the motor (30), and the other end is inserted into the spline hole of the roller (27). The threaded end of the roller (27) is engaged with the threaded hole on the mounting base (31). When the motor (30) drives the roller (27) to rotate, the roller (27) moves left and right along the mounting base (31). The position of the speed control rope (29) after passing through the speed control rope turning mechanism (26) remains unchanged. The movement of the roller (27) causes the speed control rope (29) to be wound around the roller (27) in sequence, so as to avoid the speed control rope (29) from getting tangled.

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