Space flexible extension sunshade based on multi-section electric telescopic rod and spacecraft

Abstract

The application provides a space flexible extension sunshade based on a multi-section electric telescopic rod and a spacecraft, the space flexible extension sunshade comprises a sunshade film and a plurality of telescopic rods, the plurality of telescopic rods are fixedly installed on an outer optical camera base in a circumferential direction, an outer optical camera is located in a region formed by the telescopic rods arranged in the circumferential direction, and the sunshade film is installed between adjacent telescopic rods; when in a folding state, the telescopic rods are folded, and the sunshade film is synchronously folded and stored with the telescopic rods; when in an unfolding state, the telescopic rods are extended, and the sunshade film is synchronously unfolded with the telescopic rods. The electric telescopic rod mechanism is adopted as an extension mechanism of the sunshade film, compared with a traditional sunshade, the space flexible extension sunshade has the advantages of controllable extension process, large specific stiffness, large driving force, simple control mode and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large-scale space unfolding structure, in particular to a space flexible stretching sunshade based on multi-section electric telescopic rod and a spacecraft. BACKGROUND

[0002] Stray light and heat effect is an important factor related to the imaging quality of space optical camera, especially the problem of stray light and heat flow caused by the sun. The sunlight incident into the imaging system will cause the system temperature to change dynamically in a large range and the local temperature distribution to be uneven, affecting the system imaging accuracy, reducing the dynamic range of each detection band, and even burning the device through the convergence of optical elements. An effective way to solve this problem is to install an outer sunshade at the aperture, and the longer the sunshade, the better the suppression effect of stray light and heat flow caused by the sun invasion.

[0003] With the development of new generation of large spacecraft, the aperture of space optical camera is also getting larger and larger. In order to meet the requirements of high-precision imaging, the aperture and height of the sunshade are also getting larger and larger. Limited by the space envelope of the rocket fairing and the overall structure of the satellite, it is urgent to break through the design technology of large-scale space extendable sunshade.

[0004] At present, the main large-scale stretching sunshade basically adopts flexible sunshade film material, and realizes the unfolding and folding of the sunshade film through the stretching mechanism. According to the different stretching mechanisms, there are mainly memory alloy type turnover mechanism, inflatable stretching mechanism, pod rod type stretching mechanism, hinge type folding mechanism, spring type stretching mechanism, etc. Through analysis, the following limitations are found: first, most of the sunshades are suitable for cylindrical stretching and cannot be applied to conical sunshades; second, the overall weight of the sunshade is heavy, and the fundamental frequency is small, which cannot meet the demand of on-orbit application. SUMMARY

[0005] In view of the defects in the prior art, the purpose of the present application is to provide a space flexible stretching sunshade based on multi-section electric telescopic rod and a spacecraft.

[0006] The space flexible stretching sunshade based on multi-section electric telescopic rod provided by the present application comprises a sunshade film and a plurality of telescopic rods, the plurality of telescopic rods are fixedly installed on an external optical camera base in a circumferential direction, the external optical camera is located in a region formed by the telescopic rods arranged in the circumferential direction, and the sunshade film is installed between adjacent telescopic rods.

[0007] In the folded state, the telescopic rods are folded, and the sunshade film is folded and stored synchronously with the telescopic rods.

[0008] In the unfolded state, the telescopic rods are stretched, and the sunshade film is unfolded synchronously with the telescopic rods.

[0009] Preferably, the telescopic rod comprises a fixed section fixed on the external optical camera base and a plurality of expansion sections successively sleeved inside the fixed section.

[0010] Preferably, the light shielding film is divided into multiple independent sections according to the number of the expansion sections, and the head corner points on both sides of each section of the light shielding film are respectively connected with the head of the corresponding expansion section.

[0011] The middle part of each section of the light shielding film is provided with a fold line in the vertical direction, and the fold lines of different light shielding films are arranged staggered.

[0012] The telescopic rod is in the retracted state, and each expansion section of the telescopic rod is retracted inside the fixed section of the telescopic rod, the light shielding film is synchronously folded and stored as an S shape with the telescopic rod to form a folding area, the multiple light shielding films are arranged in layers, and the folding areas of the multiple light shielding films are arranged staggered.

[0013] The telescopic rod is in the expanded state, and each expansion section of the telescopic rod is successively expanded, and the light shielding film is synchronously expanded with the telescopic rod.

[0014] Preferably, the heads of the fixed sections of adjacent telescopic rods are connected by a reinforcing rod.

[0015] Preferably, the head of the expansion section is provided with a tension spring, and the head corner points on both sides of the light shielding film are connected with the expansion section through the tension spring.

[0016] Preferably, on the projection perpendicular to the normal of the upper surface of the external optical camera base, the top of the telescopic rod extends upward in the direction away from the external optical camera, and the multiple telescopic rods are arranged in axial symmetry.

[0017] In the expanded state, the light shielding films between the multiple telescopic rods form an axially symmetrical inverted conical light shielding cover.

[0018] Preferably, the telescopic rod further comprises a screw rod transmission structure, a motor driving assembly and a support seat, and the support seat is installed on the external optical camera base.

[0019] The motor driving assembly is installed at the bottom of the support seat, the screw rod transmission structure comprises a screw rod and a nut, the nut is arranged at the bottom of the expansion section, the screw rod is arranged inside the innermost expansion section and is connected with the nut for cooperation, and the bottom end of the screw rod is connected with the motor driving assembly.

[0020] In the retracted state, the screw rod is connected with the nut at the bottom of the innermost expansion section, when the expansion section is expanded in place under the action of the screw rod, the nut at the bottom of the adjacent expansion section on the outside is driven to mesh with the screw rod, so that the multiple expansion sections are successively expanded from inside to outside.

[0021] Preferably, the telescopic rod further comprises a locking assembly, and the locking assembly comprises a locking spring plate and a clamping groove.

[0022] The locking spring is installed on the outer surface of the top of the stretching section, and the clamping groove is located at the bottom of the nut, when the stretching section is stretched to the position, the clamping groove of the nut at the bottom of the stretching section is clamped and locked with the locking spring at the top of the adjacent stretching section on the outer side, so that the adjacent stretching sections are kept relatively fixed.

[0023] Preferably, the telescopic rod further comprises a locking and unlocking assembly, the locking and unlocking assembly comprises a spring ball and a clamping tongue.

[0024] The clamping tongue and the spring ball are both installed on the outer surface of the top of the stretching section, when the adjacent stretching sections are folded to the position, the spring ball at the top of one stretching section is clamped and connected with the clamping tongue at the top of the other stretching section, and the friction locking between the spring ball and the clamping tongue is realized through the elastic force of the spring ball.

[0025] The spacecraft provided by the application comprises the space flexible stretching sunshade based on the multi-section electric telescopic rod.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] 1. The telescopic rod mechanism is used as the stretching mechanism of the sunshade film, compared with the traditional sunshade, the telescopic rod mechanism has the advantages of controllable stretching process, large specific stiffness, large driving force and simple control mode.

[0028] 2. The sunshade film is arranged in sections, is two-dimensionally unfolded and folded, and is unfolded section by section along with the telescopic rod, so that the sunshade film has the characteristics of simple folding and unfolding and is suitable for conical unfolding.

[0029] 3. The folding areas of the sunshade films in different sections are arranged in a staggered manner, so that the stacking thickness of the sunshade films can be reduced when the sunshade film is folded. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other characteristics, objects and advantages of the application will become more apparent from the following detailed description of non-restrictive embodiments, with reference to the accompanying drawings:

[0031] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the application in a folded state;

[0032] Figure 2 Fig. 2 is a schematic diagram of the overall structure of the application in an unfolded state;

[0033] Figure 3 Fig. 3 is a schematic diagram of the structure of the telescopic rod in the application;

[0034] Figure 4 Fig. 4 is a schematic diagram of the structure of the sunshade film in the application;

[0035] Figure 5 Figure 7 is a partial enlarged view of the locking assembly in the present application;

[0036] Figure 6 Figure 7 is a partial enlarged view of the locking assembly in the present application;

[0037] Figure 7 Figure 7 is a partial enlarged view of the locking assembly in the present application;

[0038] Figure 7 is a partial enlarged view of the locking assembly in the present application;

[0039] Long telescopic rod 1

[0040] Extension joint 1-1

[0041] Screw rod transmission structure 1-2

[0042] Screw rod 1-2-1

[0043] Nut 1-2-2

[0044] Locking assembly 1-3

[0045] Locking spring sheet 1-3-1

[0046] Clamping groove 1-3-2

[0047] Locking and unlocking assembly 1-4 DETAILED DESCRIPTION

[0048] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These are within the scope of the present application.

[0049] The present application overcomes the shortcomings of the prior art, innovates the light shield stretching mechanism and flexible light shield folding and unfolding implementation form, discloses a space flexible stretching light shield based on multiple electric telescopic rods and a spacecraft, which is suitable for the requirements of space large field optical camera light shielding and heat insulation, etc. The working states thereof include folding and locking state, unfolding process and fully unfolded state, and have wide universality and adaptability.

[0050] According to the application, a space flexible extension sunshade based on multi-section electric telescopic rod is provided, which comprises a sunshade film 4 and a plurality of telescopic rods, the telescopic rods are fixedly installed on an outer optical camera base in a circumferential direction, an outer optical camera is located in a region enclosed by the circumferentially arranged telescopic rods, and the sunshade film 4 is installed between adjacent telescopic rods; and the heads of the fixed sections of the adjacent telescopic rods are connected by a reinforcing rod 3. Figure 1 As shown in the folding state: the telescopic rods are folded, and the sunshade film 4 is folded and stored synchronously with the telescopic rods;

[0051] As shown in the folding state: the telescopic rods are folded, and the sunshade film 4 is folded and stored synchronously with the telescopic rods; Figure 2 As shown in the unfolded state: the telescopic rods are extended, and the sunshade film 4 is unfolded synchronously with the telescopic rods.

[0052] The telescopic rod comprises a fixed section fixedly arranged on the outer optical camera base and a plurality of extension sections 1-1 successively sleeved inside the fixed section. The sunshade film 4 is divided into a plurality of independent sections according to the number of the extension sections 1-1, the head corner points on both sides of each section of the sunshade film 4 are respectively connected with the head of the corresponding extension section 1-1, the plurality of sections of the sunshade film 4 are independently arranged and not connected with each other, two-dimensional folding and unfolding can be realized, the middle part of each section of the sunshade film 4 is provided with a crease in the vertical direction, and the creases between different sunshade films 4 are arranged staggeredly;

[0053] In the folding state: each section of the extension section 1-1 of the telescopic rod is folded inside the fixed section of the telescopic rod, the sunshade film 4 is folded and stored synchronously with the telescopic rod into an S shape, a folding area is formed, the plurality of sections of the sunshade film 4 are arranged in layers, and the folding areas of the plurality of sections of the sunshade film 4 are arranged staggeredly;

[0054] In the unfolded state: each section of the extension section 1-1 of the telescopic rod is successively extended, and the sunshade film 4 is unfolded synchronously with the telescopic rod.

[0055] The folding and unfolding states are shown in the folding state: the telescopic rods are folded, and the sunshade film 4 is folded and stored synchronously with the telescopic rods; Figure 4 The sunshade film 4 is composed of a plurality of sections, the number of sections is the same as the number of the extension sections 1-1, the head of each section is connected with the head of the extension section 1-1, in the folding state, each section is sleeved on the bottom with the extension section 1-1, each section of the trapezoidal sunshade film 4 is folded and stored in an S shape, and the perpendicular lines of each section of the trapezoidal film are staggered with each other, so that the thickness of the entire sunshade film 4 is uniform in the folding state. In the unfolding state, each section of the trapezoidal sunshade film 4 is synchronously extended with the extension section 1-1 along an S-shaped track, the head corner points on both sides of the sunshade film 4 are connected with the extension section 1-1 through a tension spring, and the sunshade film is adjusted in tension through the spring after being extended to the position.

[0056] In the projection perpendicular to the normal of the upper surface of the outer optical camera base, the top of the telescopic rod extends upward in the direction away from the outer optical camera, and the plurality of telescopic rods are arranged in axial symmetry between them; in the unfolded state, the sunshade film 4 between the plurality of telescopic rods encloses an axially symmetrical inverted conical sunshade.

[0057] As shown in Figure 5 , the telescopic rod further comprises a screw rod transmission structure 1-2, a motor driving assembly 1-5, and a support seat 1-6, the support seat 1-6 is installed on the external optical camera base; the motor driving assembly 1-5 is installed at the bottom of the support seat 1-6, the screw rod transmission structure 1-2 comprises a screw rod 1-2-1 and a nut 1-2-2, the nut 1-2-2 is arranged at the bottom of the expansion section 1-1, the screw rod 1-2-1 is arranged inside the innermost expansion section 1-1 and is connected with the nut 1-2-2, and the bottom end of the screw rod 1-2-1 is connected with the motor driving assembly 1-5;

[0058] When the telescopic rod is in the retracted state, the screw rod 1-2-1 is connected with the nut 1-2-2 at the bottom of the innermost expansion section 1-1, when the expansion section 1-1 is expanded to the position under the action of the screw rod 1-2-1, the nut 1-2-2 at the bottom of the adjacent expansion section 1-1 on the outside is driven to engage with the screw rod 1-2-1, thereby realizing the expansion of the multiple expansion sections 1-1 from inside to outside.

[0059] As shown in Figure 6 , the telescopic rod further comprises a locking assembly 1-3, the locking assembly 1-3 comprises a locking spring sheet 1-3-1 and a clamping groove 1-3-2; the locking spring sheet 1-3-1 is installed on the outer surface of the top of the expansion section 1-1, and the clamping groove 1-3-2 is located at the bottom of the nut 1-2-2; when the expansion section 1-1 is expanded to the position, the clamping groove 1-3-2 at the bottom of the nut 1-2-2 of the expansion section 1-1 is clamped and locked with the locking spring sheet 1-3-1 at the top of the adjacent expansion section 1-1 on the outside, so that the adjacent expansion sections 1-1 are kept relatively fixed. When the two expansion sections 1-1 are kept fixed, the screw rod 1-2-1 engages with the nut 1-2-2 at the bottom of the expansion section 1-1 on the outside, thereby enabling the expansion section 1-1 on the outside to continue to expand.

[0060] As shown in Figure 7 , the telescopic rod further comprises a locking and unlocking assembly 1-4, the locking and unlocking assembly 1-4 comprises a clamping tongue 1-4-1 and a spring locking ball 1-4-2; the clamping tongue 1-4-1 and the locking ball 1-4-2 are both installed on the outer surface of the top of the expansion section 1-1; when the adjacent expansion sections 1-1 are retracted to the position, the locking ball 1-4-2 at the top of one expansion section 1-1 is clamped and connected with the spring clamping tongue 1-4-1 at the top of the other expansion section 1-1, and the friction locking between the spring locking ball 1-4-2 and the clamping tongue 1-4-1 is realized through the elastic force of the spring locking ball 1-4-2. When the screw rod 1-2-1 moves and drives the expansion section 1-1 to expand, the spring locking ball 1-4-2 and the clamping tongue 1-4-1 are unlocked under the action of the thrust force.

[0061] Embodiment 1

[0062] The embodiment discloses a space flexible expansion light shield based on multi-section electric telescopic rods, and the whole light shield is composed of four groups of electric telescopic rods, a flexible light shield film 4, a driving controller and a reinforcing rod 3, and forms an axisymmetric pentahedron oblique cut inverted conical light shield. The electric telescopic rod is based on the screw nut sliding screw transmission principle, adopts a multi-section sleeving and section expansion locking form, the flexible light shield film 4 adopts a segmented S-shaped folding and sleeving form, is unfolded and tensioned with the telescopic rod section by section, the driving controller adopts a torque motor + rotary variable direct drive mode, and drives the four groups of telescopic rods to expand synchronously in sequence.

[0063] The folding state of the space flexible expansion light shield based on the multi-section electric telescopic rods is shown in Figure 1 , and the unfolded state is shown in Figure 2 , which comprises long telescopic rods 1, short telescopic rods 2, a reinforcing rod 3, a light shield film 4 and a comprehensive control box 5. The long and short telescopic rods are fixed on a camera base, the middle is two long telescopic rods 1, the two sides are two short telescopic rods 2, the reinforcing rod 3 transversely connects and fixes the head parts of the four telescopic rods, the light shield is reinforced, the light shield film 4 is segmented according to the number of telescopic rod sections, and the head angle points of each section are connected to the head of each telescopic rod section. When emitting, the telescopic rod expansion section 1-1 is folded in the fixed cylinder, and the flexible light shield is folded and stored in the fixed cabin synchronously with the telescopic rod.

[0064] The electric telescopic rod mainly comprises a plurality of expansion sections 1-1, a screw rod 1-2-1 and a screw nut 1-2-2, a locking assembly 1-3, a locking and unlocking assembly 1-4, a motor driving assembly 1-5 and a support seat 1-6, as shown in Figure 3 , and the support seat 1-6 is connected to the camera base. The screw rod transmission structure 1-2 is composed of the screw rod 1-2-1 and the screw nut 1-2-2, when folding, the two are engaged, when expanding, the screw rod 1-2-1 rotates to drive the nut 1-2-2 to move upward, the nut 1-2-2 drives the corresponding expansion section 1-1 to expand upward, and the local enlargement is shown in Figure 5 . The locking spring sheet 1-3-1 of the locking assembly 1-3 is installed on the side surface of the expansion section 1-1 section head, after expansion, the locking spring sheet 1-3-1 is clamped into the clamping groove 1-3-2 at the lower end of the screw nut 1-2-2, so as to realize the locking after expansion, and the local enlargement is shown in Figure 6 . The locking and unlocking assembly 1-4 is composed of a clamping tongue 1-4-1 and a spring lock ball 1-4-2, when folding, the clamping tongue 1-4-1 is clamped into the spring lock ball 1-4-2, so as to realize the locking of adjacent rod sections, when expanding, the spring lock ball 1-4-2 is forced to open, the clamping tongue 1-4-1 is separated, and the locking and unlocking of adjacent rod sections is realized, and the local enlargement is shown in Figure 7The long telescopic rod 1 is composed of 6 extension sections 1-1, and the short telescopic rod 2 is composed of 4 extension sections 1-1. When the telescopic rod works, the motor driving assembly drives the screw rod 1-2-1 to rotate, the nut 1-2-2 connected with the extension section 1-1 slides on the screw rod 1-2-1, thereby realizing unlocking of the locking and unlocking assembly 1-4 between the two rod sections, when the rod member moves to the position, the locking between the rod members is completed through the locking assembly 1-3, and then the two rod sections are synchronously extended under the driving of the nut 1-2-2, and the extension of all the rod sections is realized through the above-mentioned repeated process.

[0065] The comprehensive control box 5 is used for controlling the telescopic rod motor driving assembly 1-5 to work, and collecting the rod extension distance and the rod section to position information in real time, and is used for controlling the rod extension speed and judging the to position.

[0066] The spacecraft provided by the application comprises the space flexible extension sunshade based on the multi-section electric telescopic rod.

[0067] In conclusion, the flexible extension sunshade based on the multi-section electric telescopic rod realizes the unfolding and supporting of the sunshade through the variable-diameter multi-section electric telescopic rod, the extension height of the sunshade is determined by the height of each section of the telescopic rod and the number of the rod sections, the sunshade has strong designability, the segmented sunshade film can realize the change from three-dimensional folding to two-dimensional folding, greatly reduces the folding difficulty of the sunshade film and the risk of extension failure and hooking, and the telescopic rod can be selected and controlled in thickness, so that the specific stiffness of the sunshade can be greatly improved, and the sunshade has wide application value.

[0068] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0069] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A spatially flexible extendable sunshade based on a multi-section electric telescopic rod, characterized in that, Includes a light-shielding film (4) and multiple telescopic rods, which are fixedly installed on the base of an external optical camera along the circumference. The external optical camera is located in the area enclosed by the telescopic rods arranged in the circumference. The light-shielding film (4) is installed between adjacent telescopic rods. On the projection perpendicular to the normal of the upper surface of the external optical camera base, the top of the telescopic rod extends upward in a direction away from the external optical camera, and the multiple telescopic rods are arranged axially symmetrically. The telescopic rod includes a fixed section fixedly mounted on the external optical camera base and multiple extension sections (1-1) sequentially sleeved inside the fixed section. The light-shielding film (4) is divided into independent segments according to the number of segments of the extension segment (1-1). The head corners on both sides of each segment of the light-shielding film (4) are connected to the head of the corresponding extension segment (1-1). Each section of the light-shielding film (4) has a vertical crease in the middle, and the creases of different light-shielding films (4) are staggered. In the retracted state: each extension section (1-1) of the telescopic rod is retracted inside the fixed section of the telescopic rod. The light-shielding film (4) is folded and stored in an S-shape along with the telescopic rod to form a folding area. Multiple light-shielding films (4) are stacked together, and the folding areas of the multiple light-shielding films (4) are staggered. In the unfolded state: each extension section (1-1) of the telescopic rod extends in sequence, and the light-shielding film (4) unfolds synchronously with the telescopic rod. The light-shielding films (4) between multiple telescopic rods enclose each other to form an axisymmetric inverted cone-shaped light-shielding cover.

2. The spatial flexible telescopic light shield based on a multi-section electric telescopic pole according to claim 1, characterized in that, The heads of the fixed sections of adjacent telescopic rods are connected by a reinforcing rod (3).

3. The spatial flexible telescopic light shield based on a multi-section electric telescopic rod according to claim 1, characterized in that, The head of the extension joint is provided with a tension spring, and the head corners on both sides of the light-shielding film (4) are connected to the extension joint (1-1) through the tension spring.

4. The spatial flexible telescopic light shield based on a multi-section electric telescopic rod according to claim 1, characterized in that, The telescopic rod also includes a lead screw drive structure (1-2), a motor drive assembly (1-5), and a support base (1-6), which is mounted on an external optical camera base; The motor drive assembly (1-5) is installed at the bottom of the support base (1-6). The screw drive structure (1-2) includes a screw (1-2-1) and a nut (1-2-2). The nut (1-2-2) is located at the bottom of the extension section (1-1). The screw (1-2-1) is located inside the innermost extension section (1-1) and is connected to the nut (1-2-2). The bottom end of the screw (1-2-1) is connected to the motor drive assembly (1-5). In the retracted state, the lead screw (1-2-1) is connected to the nut (1-2-2) at the bottom of the innermost extension section (1-1). When the extension section (1-1) extends into place under the action of the lead screw (1-2-1), it drives the nut (1-2-2) at the bottom of the adjacent extension section (1-1) on the outer side to engage with the lead screw (1-2-1), thereby realizing the sequential extension of multiple extension sections (1-1) from the inside to the outside.

5. The spatial flexible telescopic light shield based on a multi-section electric telescopic rod according to claim 4, characterized in that, The telescopic rod also includes a locking assembly (1-3), which includes a locking spring (1-3-1) and a slot (1-3-2). The locking spring (1-3-1) is installed on the outer surface of the top of the extension section (1-1), and the slot (1-3-2) is located at the bottom of the nut (1-2-2). When the extension section (1-1) is extended into place, the slot (1-3-2) of the nut (1-2-2) at the bottom of the extension section (1-1) engages and locks with the locking spring (1-3-1) on the top of the adjacent extension section (1-1) on the outside, so that the adjacent extension sections (1-1) remain relatively fixed.

6. The spatial flexible telescopic light shield based on a multi-section electric telescopic rod according to claim 4, characterized in that, The telescopic rod also includes a locking and unlocking assembly (1-4), which includes a latch (1-4-1) and a spring locking ball (1-4-2). The latch (1-4-1) and the locking ball (1-4-2) are both installed on the outer surface of the top of the extension section (1-1). When the adjacent extension sections (1-1) are closed in place, the locking ball (1-4-2) on the top of one extension section (1-1) engages with the spring latch (1-4-1) on the top of the other extension section (1-1). The spring locking ball (1-4-2) achieves frictional locking between the spring locking ball (1-4-2) and the latch (1-4-1) through the elastic force of the spring locking ball (1-4-2).

7. A spacecraft, characterized in that, Includes a space flexible telescopic sunshade based on a multi-section electrically operated telescopic rod as described in any one of claims 1-6, the sunshade being mounted outside an optical camera on a spacecraft.

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