Automatically deployable sunshade system

Abstract

The present invention relates to an automatically deployable sunshade system, the purpose of which is to solve the technical problem that the existing sunshade has only one degree of freedom in one direction and still occupies a large space after being folded. The sunshade system comprises a sunshade assembly and a sunshade fixing device, the sunshade assembly comprises a sunshade film and N groups of extendable sunshade brackets; the N groups of sunshade brackets are arranged along the circumference of a cubic satellite platform, each group of sunshade brackets comprises two extension brackets, each extension bracket comprises a radial support rod and an axial support rod; the radial support rod is a telescopic rod, the fixed end of the radial support rod is hinged to the bottom surface inside the cubic satellite platform, and the telescopic end is hinged to the axial support rod; the axial support rod is a folding rod; the sunshade film is a flexible cylindrical structure, which is mounted on the axial support rods of the N groups of sunshade brackets; the sunshade bracket is retracted inside the cubic satellite platform, and after being unfolded, a light-shielding space surrounding the cubic satellite platform is formed; the sunshade assembly fixing device is used to fix the sunshade bracket in the retracted state.

Description

Technical Field

[0001] The invention relates to a space telescope sunshade, in particular to a sunshade system which can be automatically unfolded. Background Art

[0002] With the advancement of science and technology, high-resolution satellite remote sensing images are gradually being used in astronomy, military, agriculture, geology and other fields, all of which have very high requirements for the resolution of satellite observation images. The imaging quality of a space telescope is not only affected by the design, processing, and adjustment of its own optical and mechanical system, but also by the external stray light in space during orbital operation. As an effective device for suppressing stray light in space, the sunshade affects the imaging quality of the space telescope. The existing sunshade structure has only one degree of freedom in one direction, and still occupies a large space after being folded, which greatly increases the launch cost. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem that the existing sunshade structure has only one degree of freedom in one direction and still occupies a large space after being folded. An automatically deployable sunshade system is proposed, which can be deployed and folded in both axial and radial directions to obtain a larger folding and unfolding ratio and reduce launch costs.

[0004] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows.

[0005] An automatically deployable sunshade system is characterized in that: it comprises a sunshade assembly and a sunshade assembly fixing device, wherein the sunshade assembly comprises a sunshade film and N sets of extendable sunshade brackets, wherein N is greater than or equal to 4;

[0006] The N groups of sunshade brackets are arranged along the circumference of the cubic satellite platform, and each group of sunshade brackets includes two extension brackets arranged in parallel, and each extension bracket includes a radial support rod that can be expanded radially and an axial support rod that can be expanded axially; the radial support rod is a telescopic rod, and the fixed end of the radial support rod is hinged on the bottom surface inside the cubic satellite platform, and the telescopic end of the radial support rod is hinged to the axial support rod; the axial support rod is a folding rod; the sunshade film is a flexible cylindrical structure, which is sleeved on the outside or inside of the axial support rods of the N groups of sunshade brackets, and the two ends of each axial support rod are respectively connected to the bottom end and the top end of the sunshade film;

[0007] The sunshade bracket is located inside the cubic satellite platform when in a retracted state, and the sunshade film is folded and arranged on the sunshade bracket; the sunshade bracket forms a light-shielding space around the cubic satellite platform when in an unfolded state, and the sunshade film is coated on the outer side or the inner side of the axial support rod;

[0008] The sunshade assembly fixing device is used to fix the sunshade bracket in the retracted state.

[0009] Further, the radial support rod comprises a mounting base, a first radial support rod, a second support rod, a third support rod and a stretch spring, and the mounting base is arranged on the bottom surface inside the cubic satellite platform;

[0010] A rotating shaft is arranged on the mounting base, the first end of the first radial support rod is sleeved on the rotating shaft, and the rotating shaft is also provided with a torsion spring, which makes the first radial support rod parallel to the bottom surface inside the cubic satellite platform; the end of the third support rod is hinged to the axial support rod;

[0011] The first radial support rod, the second support rod, and the third support rod are sequentially connected in the unfolded state;

[0012] The second radial support rod and the third radial support rod can be slidably mounted in the first radial support rod in sequence in a retracted state, one end of the extension spring is fixedly connected to the mounting base, and the other end is fixedly connected to the end of the third radial support rod, and the extension spring is used to expand the third radial support rod, the second radial support rod, and the first radial support rod which are mounted in sequence;

[0013] A first limiting device and a second limiting device are respectively provided between the second radial supporting rod and the first radial supporting rod, and between the second radial supporting rod and the third radial supporting rod, for limiting and fixing after deployment.

[0014] Furthermore, the first limiting device and the second limiting device have the same structure, and both include a positioning pin and a lifting spring connected to the positioning pin;

[0015] In the first positioning device, one end of the lifting spring is fixedly connected to the inner wall of the head end of the second support rod, the head end of the second support rod is provided with a radial first through hole corresponding to the position of the positioning pin, the positioning pin radially protrudes out of the first through hole, and the end of the first radial support rod is provided with a first positioning hole corresponding to the first through hole, and the positioning pin is located in the first positioning hole in the expanded state;

[0016] In the second positioning device, one end of the lifting spring is fixedly connected to the inner wall of the head end of the third support rod, and a radial second through hole is arranged at the head end of the third support rod corresponding to the position of the positioning pin. The positioning pin radially protrudes out of the second through hole, and a second positioning hole is arranged at the end of the second support rod corresponding to the second through hole. The positioning pin is located in the second positioning hole in the expanded state.

[0017] Furthermore, the axial support rod is perpendicular to the radial support rod in the unfolded state, and the axial support rod comprises an elastic hinge, a first axial rod, and a plurality of groups of folding units connected in sequence; one end of the first axial rod is hinged to the end of the third radial support rod through the elastic hinge, and the other end of the first axial rod is connected to the first group of folding units;

[0018] The folding unit includes a strip spring and a second axial rod connected in sequence, the strip spring of the first group of folding units is connected to the other end of the first axial rod; the second axial rod of the last group of folding units is connected to the top of the sunshade film; one end of the first axial rod is connected to the bottom end of the sunshade film through an elastic hinge.

[0019] Furthermore, there are multiple sunshade fixing devices, which are annular belt devices with locking and releasing devices, and are connected end to end through the locking and releasing devices; the axial support rods of each group of sunshade brackets are folded and fixed by the sunshade fixing devices respectively; the radial support rods are perpendicular to the bottom surface inside the cubic satellite platform and are fixed by the sunshade fixing devices; the axial support rods of the two groups of sunshade brackets are fixed by the sunshade fixing devices; the locking and releasing devices are devices that automatically unlock by thermal deformation.

[0020] Furthermore, the sunshade film is a multi-layer structure, which is arranged from the outside to the inside in sequence as aluminum foil, silicone rubber, polyimide silk cloth, silicone rubber, and black polyimide film. The multi-layer sunshade film can better suppress spatial stray light and improve the imaging quality of the space telescope.

[0021] Furthermore, the elastic hinge includes an elastic rod and a connecting piece connecting the elastic rod, the elastic rod is formed by buckling two strip springs, the elastic rod is connected to the first axial rod, and the connecting piece is connected to the third radial support rod; the connecting piece is connected to the bottom end of the sunshade film.

[0022] Furthermore, thin guiding rods are arranged between the first axial rod and the second axial rods of the first group of folding units, and between the second axial rods of adjacent folding units.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention provides an automatically deployable sunshade system that can be folded and unfolded in both radial and axial directions to obtain a larger folding and unfolding ratio, low space occupancy, and reduced emission volume. Compared with a sunshade deployment mechanism that deploys in one direction, the deployed shading area is larger under the same emission volume.

[0025] 2. The present invention provides an automatically deployable sunshade system, in which the sunshade bracket is passively deployed using a torsion spring, an extension spring and a strip spring. The sunshade is automatically deployed without the need for additional power.

[0026] 3. The present invention provides an automatically deployable sunshade system, which has a simple structure and a light overall weight, thus saving launch costs.

[0027] 4. The present invention provides an automatically deployable sunshade system, wherein the sunshade film with a multi-layer structure can better suppress spatial stray light and improve the imaging quality of the space telescope. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of an automatically deployable sunshade system embodiment of the present invention in a deployed state without being covered with a sunshade film;

[0029] Figure 2 This is a schematic diagram of an automatically deployable sunshade system embodiment of the present invention, in which a sunshade film covering the sunshade is deployed;

[0030] Figure 3 A schematic diagram of a folded state of a sunshade bracket of an embodiment of a sunshade system that can be automatically deployed according to the present invention;

[0031] Figure 4 It is a structural schematic diagram of a sunshade fixing device in a folded state according to an embodiment of a sunshade system that can be automatically unfolded according to the present invention;

[0032] Figure 5 It is a schematic diagram of a support structure in an unfolded state in an embodiment of an automatically unfoldable sunshade system of the present invention;

[0033] Figure 6 It is a schematic diagram of the connection structure of the first radial support rod in an embodiment of an automatically deployable sunshade system of the present invention;

[0034] Figure 7 It is a schematic structural diagram of a position limiting device in an embodiment of a sunshade system that can be automatically deployed according to the present invention;

[0035] Figure 8 This is a schematic diagram of an elastic hinge structure in an embodiment of an automatically deployable sunshade system of the present invention;

[0036] Explanation of the reference numerals: 1-shade assembly, 121-elastic hinge, 1211-elastic rod, 1212-connecting piece, 122-first axial rod, 123-strip spring, 124-second axial rod, 2-cubic satellite platform, 201-first radial support rod, 202-second radial support rod, 203-third radial support rod, 212-extension spring, 213-rotation axis, 214-torsion spring, 215-locating pin, 216-lifting spring, 3-shade film, 4-shade fixing device, 5-locking release device. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] An automatically deployable sunshade system of the present invention, such as Figures 1 to 6As shown, it includes a sunshade assembly 1 and a sunshade fixing device 4, the sunshade assembly 1 includes a sunshade film 3 and four groups of extendable sunshade brackets, N groups of sunshade brackets are arranged circumferentially along the cubic satellite platform 2, each group of sunshade brackets includes two extended brackets arranged in parallel, each extended bracket includes a radial support rod that can be expanded radially and an axial support rod that can be expanded axially; the radial support rod is a telescopic rod, the fixed end of the radial support rod is used to be hinged on the bottom surface inside the cubic satellite platform 2, and the telescopic end is hinged to the axial support rod; the axial support rod is Folding rod; the sunshade film 3 is a flexible cylindrical structure, which is mounted on the outside of the axial support rods of the N groups of sunshade brackets, and the two ends of each axial support rod are respectively connected to the bottom and top of the sunshade film 3; the sunshade bracket is located inside the cubic satellite platform 2 when in the retracted state, and the sunshade film 3 is folded and arranged on the sunshade bracket; the sunshade bracket forms a light-shielding space around the cubic satellite platform 2 when in the unfolded state, and the sunshade film 3 is covered on the outside of the axial support rod; the sunshade fixing device 4 fixes the sunshade bracket in the retracted state.

[0039] The radial support rod comprises a mounting base, a first radial support rod 201, a second support rod 202, a third support rod 203 and a stretch spring 212, wherein the mounting base is arranged on the bottom surface inside the cubic satellite platform 2; the end of the first radial support rod 201, the second support rod 202 and the third support rod 203 close to the bottom surface of the cubic satellite platform 2 is the head end, and the other end is the tail end;

[0040] A rotating shaft 213 is provided on the mounting base, and the first end of the first radial support rod 201 is sleeved on the rotating shaft 213. The rotating shaft 213 is also provided with a torsion spring 214. The torsion spring 214 makes the first radial support rod 201 parallel to the bottom surface inside the cubic satellite platform 2; the end of the third support rod 203 is hinged to the axial support rod;

[0041] The first radial support rod 201, the second support rod 202, and the third support rod 203 are connected in sequence in the unfolded state;

[0042] The second radial support rod 202 and the third radial support rod 203 can be slidably mounted in the first radial support rod 201 in sequence in the contracted state. One end of the extension spring 212 is fixedly connected to the mounting base, and the other end is fixedly connected to the end of the third radial support rod 203. The extension spring 212 is used to expand the third radial support rod 203, the second radial support rod 202, and the first radial support rod 201 which are mounted in sequence.

[0043] A first limiting device and a second limiting device are respectively provided between the second radial support rod 202 and the first radial support rod 201, and between the second radial support rod 202 and the third radial support rod 203, for limiting and fixing the position after deployment.

[0044] The first limiting device and the second limiting device have the same structure, and both include a positioning pin (215) and a lifting spring 216 connected to the positioning pin 215; in the first positioning device, one end of the lifting spring 216 is fixedly connected to the inner wall of the head end of the second support rod 202, and the head end of the second support rod 202 is provided with a radial first through hole corresponding to the position of the positioning pin 215, and the positioning pin 215 radially protrudes out of the first through hole, and the end of the first radial support rod 201 is provided with a first positioning hole corresponding to the first through hole, and the positioning pin 215 is located in the first positioning hole in the expanded state; in the second positioning device, one end of the lifting spring 216 is fixedly connected to the inner wall of the head end of the third support rod 203, and the head end of the third support rod 203 is provided with a radial second through hole corresponding to the position of the positioning pin 215, and the positioning pin 215 radially protrudes out of the second through hole, and the end of the second support rod 202 is provided with a second positioning hole corresponding to the second through hole, and the positioning pin 215 is located in the second positioning hole in the expanded state.

[0045] The axial support rod is perpendicular to the radial support rod in the unfolded state, and the axial support rod includes an elastic hinge 121, a first axial rod 122, and a plurality of groups of folding units connected in sequence; one end of the first axial rod 122 is hinged to the end of the third radial support rod 203 through the elastic hinge 121, and the other end of the first axial rod 122 is connected to the first group of folding units;

[0046] The folding unit includes a strip spring 123 and a second axial rod 124 connected in sequence, the strip spring 123 of the first group of folding units is connected to the other end of the first axial rod 122; the second axial rod 124 of the last group of folding units is connected to the top end of the sunshade film 3; one end of the first axial rod 122 is connected to the bottom end of the sunshade film 3 through an elastic hinge 121.

[0047] There are multiple sunshade fixing devices 4, and the sunshade fixing devices 4 are annular belt devices with locking and releasing devices 5, which are connected end to end through the locking and releasing devices 5; the axial support rods of each group of sunshade brackets are folded and fixed by the sunshade fixing devices 4 respectively; the radial support rods are perpendicular to the bottom surface inside the cubic satellite platform 2 and are fixed by the sunshade fixing devices (4); the axial support rods of the two groups of sunshade brackets are fixed by the sunshade fixing devices 4; the locking and releasing devices 5 are devices that automatically unlock by thermal deformation.

[0048] like Figure 7 As shown, the limiting device includes a positioning pin 215 and a lifting spring 216 connected to the positioning pin 215. The lifting spring 216 is fixed in the radial support rod. The positioning pin 215 protrudes out of the radial support rod. The corresponding radial support rod is provided with a positioning hole. When the extension spring 212 expands the radial support rod, the positioning pin 215 extends into the positioning hole to limit the radial support rod from continuing to expand.

[0049] like Figure 8 As shown, the elastic hinge 121 includes an elastic rod 1211 and a connecting piece 1212 fixedly connected to the elastic rod 1211 . The elastic rod 1211 is formed by buckling two strip springs. The elastic rod 1211 is connected to the third radial support rod 203 , and the connecting piece 1212 is connected to the first axial rod 122 .

[0050] In order to cope with the interference of the space environment and effectively suppress the stray light in space, the sunshade film 3 is designed as a multi-layer structure, which is arranged from the outside to the inside as aluminum foil, silicone rubber, polyimide silk cloth, silicone rubber, and black polyimide film.

[0051] Working process:

[0052] Before the launch of the cubic satellite, the multiple folding units of the axial support rods are folded by the strip spring 123, and then fixed by the light shield fixing device, the radial support rods are inserted inside, and the radial support rods are perpendicular to the inner bottom surface of the cubic satellite platform, and the four radial support rods are fixed by the light shield fixing device, and the four groups of axial support rods are abutted against the cubic satellite platform. After the cubic satellite reaches space, under the temperature change, the locking release device of the light shield fixing device is opened due to the temperature change, and under the action of the torsion spring 214, the first radial support rod 201 protrudes out of the cubic satellite platform 2, and the extension spring 212 pushes the third radial support rod 203 and the second radial support rod 202 to extend outward, and then they are fixed under the action of the limit device. At the same time, the axial support rod unfolds, and the elastic hinge 121 unfolds first. At this time, the axial support rod is perpendicular to the radial support rod. Under the action of the strain energy stored when the strip spring 123 is folded and the guiding thin rod, the first axial rod 122 and the multiple groups of folding units connected in sequence are stretched; the sunshade film is also covered on the sunshade bracket as the sunshade bracket extends.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. For ordinary professional and technical personnel in the field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions protected by the present invention.

Claims

1. An automatically deployable sunshade system, characterized in that: It comprises a sunshade assembly (1) and a sunshade fixing device (4), wherein the sunshade assembly (1) comprises a sunshade film (3) and N groups of extendable sunshade brackets, where N is greater than or equal to 4; The N groups of sunshade brackets are arranged along the circumference of the cubic satellite platform (2), and each group of sunshade brackets includes two extension brackets arranged in parallel, and each extension bracket includes a radial support rod that can be expanded radially and an axial support rod that can be expanded axially; the radial support rod is a telescopic rod, and the fixed end of the radial support rod is hinged on the bottom surface inside the cubic satellite platform (2), and the telescopic end is hinged to the axial support rod; the axial support rod is a folding rod; the sunshade film (3) is a flexible cylindrical structure, which is sleeved on the outside or inside of the axial support rod of the N groups of sunshade brackets, and the two ends of each axial support rod are respectively connected to the bottom end and the top end of the sunshade film (3); The light shield bracket is located inside the cubic satellite platform (2) when in a retracted state, and the light shield film (3) is folded and arranged on the light shield bracket; the light shield bracket forms a light shielding space surrounding the cubic satellite platform (2) when in an unfolded state, and the light shield film (3) is wrapped around the outer side or the inner side of the axial support rod; The sunshade fixing device (4) is used to fix the sunshade bracket in a retracted state; there are multiple sunshade fixing devices (4), and the sunshade fixing device (4) is an annular belt-shaped device with a locking and releasing device (5), which is connected end to end through the locking and releasing device (5); the axial support rods of each group of sunshade brackets are respectively fixed by the sunshade fixing device (4) after being folded; the radial support rods are fixed by the sunshade fixing device (4) after being perpendicular to the bottom surface of the cubic satellite platform (2); the axial support rods of the two groups of sunshade brackets are fixed by the sunshade fixing device (4); the locking and releasing device (5) is a device that automatically unlocks by thermal deformation; The light shield film (3) is a multi-layer structure, which is arranged in sequence from the outside to the inside: aluminum foil, silicone rubber, polyimide silk cloth, silicone rubber, and black polyimide film.

2. The automatically deployable sunshade system according to claim 1, characterized in that: The radial support rod comprises a mounting base, a first radial support rod (201), a second radial support rod (202), a third radial support rod (203) and an extension spring (212); the mounting base is arranged on the bottom surface inside the cubic satellite platform (2); A rotating shaft (213) is arranged on the mounting base, the head end of the first radial support rod (201) is sleeved on the rotating shaft (213), and the rotating shaft (213) is also provided with a torsion spring (214), and the torsion spring (214) makes the first radial support rod (201) parallel to the bottom surface inside the cubic satellite platform (2); the end of the third radial support rod (203) is hinged to the axial support rod; The first radial support rod (201), the second radial support rod (202), and the third radial support rod (203) are connected in sequence in an unfolded state; The second radial support rod (202) and the third radial support rod (203) can be slidably mounted in the first radial support rod (201) in sequence in a retracted state; one end of the extension spring (212) is fixedly connected to the mounting base, and the other end is fixedly connected to the end of the third radial support rod (203); the extension spring (212) is used to expand the third radial support rod (203), the second radial support rod (202), and the first radial support rod (201) which are mounted in sequence; A first limiting device and a second limiting device are respectively provided between the second radial supporting rod (202) and the first radial supporting rod (201), and between the second radial supporting rod (202) and the third radial supporting rod (203), for limiting and fixing the parts after deployment.

3. The automatically deployable sunshade system according to claim 2, characterized in that: The first limiting device and the second limiting device have the same structure, and both include a positioning pin (215) and a lifting spring (216) connected to the positioning pin (215); In the first limiting device, one end of the lifting spring (216) is fixedly connected to the inner wall of the head end of the second radial support rod (202); the head end of the second radial support rod (202) is provided with a radial first through hole corresponding to the position of the positioning pin (215); the positioning pin (215) radially protrudes out of the first through hole; the end of the first radial support rod (201) is provided with a first positioning hole corresponding to the first through hole; the positioning pin (215) is located in the first positioning hole in the expanded state; In the second limiting device, one end of the lifting spring (216) is fixedly connected to the inner wall of the head end of the third radial support rod (203), and a radial second through hole is arranged at the head end of the third radial support rod (203) corresponding to the position of the positioning pin (215), and the positioning pin (215) radially protrudes out of the second through hole, and a second positioning hole is arranged at the end of the second radial support rod (202) corresponding to the second through hole, and the positioning pin (215) is located in the second positioning hole in the expanded state.

4. The automatically deployable sunshade system according to claim 2 or 3, characterized in that: The axial support rod is perpendicular to the radial support rod in the unfolded state, and the axial support rod comprises an elastic hinge (121), a first axial rod (122), and a plurality of groups of folding units connected in sequence; one end of the first axial rod (122) is hinged to the end of the third radial support rod (203) through the elastic hinge (121), and the other end of the first axial rod (122) is connected to the first group of folding units; The folding unit comprises a strip spring (123) and a second axial rod (124) connected in sequence, wherein the strip spring (123) of the first group of folding units is connected to the other end of the first axial rod (122); the second axial rod (124) of the last group of folding units is connected to the top end of the shading film (3); and one end of the first axial rod (122) is connected to the bottom end of the shading film (3) via an elastic hinge (121).

5. The automatically deployable sunshade system according to claim 4, characterized in that: The elastic hinge (121) comprises an elastic rod (1211) and a connecting piece (1212) connecting the elastic rod (1211), the elastic rod (1211) is formed by buckling two strip springs, the elastic rod (1211) is connected to the first axial rod (122), and the connecting piece (1212) is connected to the third radial support rod (203); The connecting piece (1212) is connected to the bottom end of the light shield film (3).

6. The automatically deployable sunshade system according to claim 5, characterized in that: A thin guiding rod is provided between the first axial rod (122) and the second axial rods (124) of the first group of folding units, and between the second axial rods (124) of adjacent folding units.

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