CN113675615B - Space navigation folded antenna reflector and satellite system provided with same - Google Patents
Space navigation folded antenna reflector and satellite system provided with same Download PDFInfo
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- CN113675615B CN113675615B CN202110982802.7A CN202110982802A CN113675615B CN 113675615 B CN113675615 B CN 113675615B CN 202110982802 A CN202110982802 A CN 202110982802A CN 113675615 B CN113675615 B CN 113675615B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
- H01Q15/161—Collapsible reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
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Abstract
The invention belongs to the technical field of aerospace, and particularly provides an aerospace folded antenna reflector and a satellite system provided with the same. The space navigation folded antenna reflector and the satellite system provided with the same have the advantages of high storage rate, high unfolding rigidity, good stability, high shape surface precision and the like.
Description
Technical Field
The invention belongs to the technical field of aerospace, and particularly provides an aerospace folded antenna reflector and a satellite system provided with the same.
Background
The space navigation folded antenna reflector is an important component of a satellite system, and is an important space navigation device which is indispensable for people to carry out communication and scientific research such as satellite communication, deep space exploration, space science, radio astronomy and the like. The folded and unfolded antenna reflector has folding and unfolding functions, and the folded reflector is arranged on the side surface of the satellite system when the rocket is launched; when the satellite enters a preset orbit, the folded antenna reflector performs a series of operations such as unlocking, unfolding, locking and the like according to the instruction requirement, and finally starts working. The reflector has a large storage rate, so that the reflector has wide application in space vehicles such as satellite systems, spacecraft, space stations and the like. With the continuous development of the space technology, the structure and the function of the space device are more and more complex and diversified, and the urgent need is raised for the folded antenna reflector with the characteristics of large caliber, high precision and light weight. The folded antenna reflector can be divided into three types of fixed surface type, inflatable type and net surface type according to the structural form of the working surface, wherein the net surface type folded antenna reflector is most widely applied, and the structure is generally formed by paving a flexible metal reflecting net surface structure on a rigid supporting structure with folding and unfolding functions, and the supporting structure plays roles of unfolding, supporting, shape keeping and the like on the net surface. The existing net surface type folded antenna reflector represented by the annular truss type has the advantages that the structural quality is not multiplied along with the increase of the antenna caliber, but the structure of the net surface type folded antenna reflector is poor in stability, insufficient in rigidity, difficult to guarantee the shape surface precision and the like along with the further increase of the antenna caliber; meanwhile, the annular truss type folded antenna reflector is arranged on the satellite system, so that the defects of low stability and low rigidity of the annular truss type folded antenna reflector can also have adverse effects on the stability and safety of the whole satellite system.
Disclosure of Invention
Aiming at the problems that the existing mesh-type folded and unfolded antenna reflector is low in rigidity, poor in structural stability and low in shape surface precision and affects the stability and safety of a satellite system along with the increase of an unfolding caliber, the invention provides an aerospace folded and unfolded antenna reflector and a satellite system provided with the same, and the satellite system has the advantages of high storage rate, high unfolding rigidity, good stability, high shape surface precision and the like.
The invention is realized in this way, and provides an aerospace folded antenna reflector, which comprises a central rod assembly and a plurality of rib units, wherein the central rod assembly comprises a central rod, the plurality of rib units are uniformly distributed in a radial shape by taking the central rod as the center, each rib unit comprises an expandable unit and a Y-shaped mechanism, one end of the expandable unit is rotationally connected with the central rod, the other end of the expandable unit is rotationally connected with the Y-shaped mechanism, and the edge of a cable net is connected with each Y-shaped mechanism.
Preferably, the central rod assembly further comprises a central rod upper connecting block and a central rod lower connecting block, the central rod upper connecting block is fixedly connected to the upper end of the central rod, the central rod lower connecting block is fixedly connected to the lower end of the central rod, the central rod upper connecting block and the central rod lower connecting block are of petal-shaped structures, the outer side of the central rod upper connecting block is rotationally connected with one side of the upper end of each expandable unit, and the outer side of the central rod lower connecting block is rotationally connected with one side of the lower end of each expandable unit.
Further preferably, the expandable unit comprises an upper chord member, a lower chord member, a vertical rod, a large diagonal member and a small diagonal member, wherein two sides of the upper end of the vertical rod are respectively connected with the upper chord member in a rotating mode, two small diagonal members are respectively connected with the vertical rod on the lower side of the two upper chord members in a rotating mode, two lower chord members are respectively connected with the two sides of the lower end of the vertical rod in a rotating mode, a vertical rod sliding block and a vertical rod spring are sleeved on the vertical rod in a sleeved mode, two ends of the vertical rod spring are respectively propped against the lower ends of the vertical rod sliding block and the vertical rod, two ends of the vertical rod sliding block are respectively connected with a supporting rod in a rotating mode, the other ends of the two supporting rods are respectively connected with the small diagonal members on the same side in a rotating mode, one ends of the two small diagonal members away from the large diagonal members are respectively connected with the large diagonal members on the same side in a rotating mode, one ends of the two large diagonal members away from the lower chord members on the same side are respectively connected with one ends of the lower chord members on the same side, one ends of the upper chord members away from the central member are connected with one ends of the central member in a rotating mode, one ends of the upper chord members away from the central member are connected with one end of the central member in a rotating mode, one end of the central member away from one end of the central member is connected with one end of the central member, and one end of the central member is far away from one end of the central member.
Further preferably, the expandable unit further comprises a vertical rod upper connecting block and a vertical rod lower connecting block, the vertical rod upper connecting block is fixedly connected to the upper end of the vertical rod, the vertical rod lower connecting block is fixedly connected to the lower end of the vertical rod, the vertical rod upper connecting block is of an I-shaped structure, the two sides of the upper end of the vertical rod upper connecting block are respectively connected with the upper chord member in a rotating mode, the two sides of the lower end of the vertical rod upper connecting block are respectively connected with the small inclined web member in a rotating mode, and the two ends, away from the vertical rod, of the vertical rod lower connecting block are respectively connected with the lower chord member in a rotating mode.
Further preferably, the Y-shaped mechanism comprises a Y-shaped mechanism center rod, Y-shaped mechanism upper chords, Y-shaped mechanism large inclined web members and Y-shaped mechanism small inclined web members, the upper ends of the Y-shaped mechanism center rods are rotationally connected with the two Y-shaped mechanism upper chords, the lower ends of the Y-shaped mechanism center rods are rotationally connected with the two Y-shaped mechanism large inclined web members, the other ends of the two Y-shaped mechanism large inclined web members are respectively rotationally connected with one Y-shaped mechanism small inclined web member, the other ends of the two Y-shaped mechanism small inclined web members are respectively rotationally connected with the Y-shaped mechanism upper chords on the corresponding sides, two ends of the Y-shaped mechanism springs are respectively propped against the upper ends of the Y-shaped mechanism center rods and the Y-shaped mechanism sliding blocks, the side faces of the Y-shaped mechanism sliding blocks are rotationally connected with two Y-shaped mechanism supporting rods, and the other ends of the two Y-shaped mechanism supporting rods are respectively rotationally connected with the two Y-shaped mechanism large inclined web members on the corresponding sides.
Further preferably, the Y-shaped mechanism further comprises an upper Y-shaped mechanism connecting block and a lower Y-shaped mechanism connecting block, the upper Y-shaped mechanism connecting block is fixedly connected to the upper end of the central rod of the Y-shaped mechanism, the upper Y-shaped mechanism connecting block is rotationally connected with two upper Y-shaped mechanism chords, the lower Y-shaped mechanism connecting block is fixedly connected to the lower end of the central rod of the Y-shaped mechanism, the lower Y-shaped mechanism connecting block is rotationally connected with two large Y-shaped mechanism diagonal web members, and the upper Y-shaped mechanism connecting block and the lower Y-shaped mechanism connecting block are rotationally connected with the expandable unit.
Further preferably, a connecting member is respectively arranged at the positions where the upper chords of the Y-shaped mechanisms are connected with the small inclined web members of the Y-shaped mechanisms, long strip holes are formed in the connecting member, and the small inclined web members of the Y-shaped mechanisms are rotatably connected in the long strip holes of the connecting member.
Further preferably, the rib units are provided in 6.
The invention also provides a satellite system provided with the aerospace folded antenna reflector, which comprises a satellite body, wherein the aerospace folded antenna reflector is connected to the satellite body through a mechanical arm assembly, the mechanical arm assembly is an open type multi-link mechanism, one end of the mechanical arm assembly is rotatably connected to the satellite body, the other end of the mechanical arm assembly is fixedly connected with the aerospace folded antenna reflector, and one end of the mechanical arm assembly connected with the aerospace folded antenna reflector is also provided with a locking and releasing device.
Preferably, two solar wings are symmetrically arranged on the side surface of the satellite body.
Compared with the prior art, the invention has the advantages that:
1. the aerospace folded antenna reflector provided by the invention consists of a plurality of expandable units with modularized structural characteristics and Y-shaped mechanisms, so that the types and the number of parts are reduced, and the aerospace folded antenna reflector has great advantages in the aspects of interchangeability, development period, processing cost and the like;
2. after the space navigation folded antenna reflector is completely unfolded, the radial expandable unit and the circumferential Y-shaped mechanism are relied on, so that the reflection net surface is supported by the structure in the radial direction and the circumferential direction, and the rigidity, the stability and the shape surface precision of the structure are improved;
3. the space navigation folded and unfolded antenna reflector provided by the invention adopts a passive driving mode, is unfolded by virtue of the elastic potential energy driving mechanism stored by the compression spring, and has the advantages of light weight, high reliability, small installation occupation space and the like;
4. the space folding antenna reflector provided by the invention is not only suitable for the technical field of space, but also has higher reference and reference values in the related fields of ground vehicle-mounted antennas, sunshade umbrellas, sunshade pavilions, rescue tents and the like;
5. the satellite system provided with the reflector can realize the rapid installation of the reflector mechanism and the satellite body, and has the advantages of simple structure, convenient installation and good stability.
Drawings
FIG. 1 is a schematic diagram of a fully deployed state of an aerospace folded antenna reflector provided by the present invention;
FIG. 2 is a top view of the aerospace folded antenna reflector provided by the present invention in a fully unfolded state;
FIG. 3 is a schematic view of a fully collapsed reflector of an aerospace folded antenna according to the present invention;
FIG. 4 is a schematic view of a center pole assembly;
FIG. 5 is a schematic view of a rib unit structure;
FIG. 6 is a schematic diagram of a deployable cell structure;
FIG. 7 is a schematic view of the Y-mechanism in an expanded state;
FIG. 8 is a schematic view of the Y-shaped mechanism in a collapsed state;
FIG. 9 is a schematic top chord assembly;
FIG. 10 is a bottom chord assembly schematic;
FIG. 11 is a schematic view of a large diagonal web member assembly;
FIG. 12 is a schematic view of a Y-shaped mechanism top chord assembly;
FIG. 13 is a schematic view of a Y-shaped mechanism small diagonal web member assembly;
fig. 14 is a schematic view of a folded state of the space navigation folded antenna reflector provided by the invention connected to a satellite body;
fig. 15 is a schematic view of an unfolded state of a mechanical arm with an aerospace folded antenna reflector connected to a satellite body;
fig. 16 is a schematic view of a fully unfolded state of the space navigation folded antenna reflector provided by the invention connected to a satellite body.
In the accompanying drawings: 1-center rod assembly, 2-rib unit, 3-center rod upper connecting block, 4-upper chord, 5-large diagonal web member, 6-small diagonal web member, 7-vertical rod upper connecting block, 8-first straight rod, 9-Y-shaped mechanism upper connecting block, 10-Y-shaped mechanism large diagonal web member, 11-Y-shaped mechanism small diagonal web member, 12-connecting member, 13-Y-shaped mechanism upper chord member, 14-first joint, 15-Y-shaped mechanism lower connecting block, 16-Y-shaped mechanism sliding block, 17-Y-shaped mechanism center rod, 18-lower chord member, 19-vertical rod lower connecting block, 20-vertical rod, 21-vertical rod sliding block, 22-supporting rod, 23-center rod lower connecting block, 24-center rod, 25-vertical rod spring, 26-Y-shaped mechanism spring 27-seventh joint, 28-eighth joint, 29-fourth joint, 30-fifth joint, 31-second joint, 32-third joint, 33-Y-shaped mechanism support bar, 34-deployable unit, 35-Y-shaped mechanism, 36-first fixed hole, 37-first through hole, 38-second straight bar, 39-second fixed hole, 40-fourth through hole, 41-third straight bar, 42-third fixed hole, 43-fifth through hole, 44-fifth straight bar, 45-fourth straight bar, 46-sixth joint, 47-end face, 48-sixth straight bar, 49-fifth fixed hole, 50-third through hole, 51-satellite body, 52-space-folding antenna reflector, 53-mechanical arm assembly, 54-solar wing, 55-locking release device, 56-fourth fixed hole, 57-second through hole.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1,
Referring to fig. 1, 2 and 3, the present embodiment provides an aerospace folded antenna reflector, which includes a central rod assembly 1 and a plurality of rib units 2, wherein the central rod assembly 1 includes a central rod 24, the plurality of rib units 2 are uniformly distributed in a radial shape with the central rod 24 as a center, each rib unit 2 includes a deployable unit 34 and a Y-shaped mechanism 35, one end of the deployable unit 34 is rotatably connected with the central rod 24, the other end is rotatably connected with the Y-shaped mechanism 35, and an edge of a cable net is connected with each Y-shaped mechanism 35.
During deployment, the expandable unit 34 and the Y-shaped mechanism 35 are radially and outwardly expanded about the central rod 24, such that the cable mesh is supported by the expandable unit 34 and the Y-shaped mechanism 35.
Referring to fig. 4, the central rod assembly further includes an upper central rod connecting block 3 and a lower central rod connecting block 23, the upper central rod connecting block 3 is fixedly connected to the upper end of the central rod 24, the lower central rod connecting block 23 is fixedly connected to the lower end of the central rod 24, the upper central rod connecting block 3 and the lower central rod connecting block 23 are of petal-shaped structures, a plurality of preformed holes are formed in the outer side of the upper central rod connecting block 3 and are rotatably connected to the upper end side of each expandable unit 34 through the preformed holes, and a plurality of preformed holes are also formed in the outer side of the lower central rod connecting block 23 and are rotatably connected to the lower end side of each expandable unit 34 through the preformed holes.
Specifically, the upper connecting block 3 of the central rod is connected with the upper end of the central rod 24 in an interference fit manner, and the lower connecting block 23 of the central rod is connected with the lower end of the central rod 24 in a bolt connection manner.
Referring to fig. 5 and 6, the expandable unit 34 includes an upper chord member 4, a lower chord member 18, a vertical rod 20, a large diagonal member 5 and a small diagonal member 6, two sides of the upper end of the vertical rod 20 are respectively and rotatably connected with the upper chord member 4, two sides of the lower end of the vertical rod 20 are respectively and rotatably connected with the lower chord member 18, a vertical rod slider 21 and a vertical rod spring 25 are sleeved on the vertical rod 20, two ends of the vertical rod spring 25 are respectively propped against the lower ends of the vertical rod slider 21 and the vertical rod 20, two ends of the vertical rod slider 21 are respectively and rotatably connected with a supporting rod 22, the other ends of the two supporting rods 22 are respectively and rotatably connected with the small diagonal member 6 on the same side, one ends of the two small diagonal members 6 far away from the vertical rod 20 are respectively and rotatably connected with the large diagonal member 5 on the same side, one ends of the two large diagonal members 5 far away from the small diagonal member 6 are respectively and rotatably connected with one ends of the vertical rod 18 on the same side, one end of the vertical rod 20 far away from the central end of the vertical rod 20, one end 4 far away from the central end 24 of the vertical rod 20 is far from the other end of the vertical rod 20, one end of the central end 24 is far away from the central end 20 is far from the other end 35 of the vertical rod 20, and one end of the central end is far away from the central end 20 is far from the other end 20 is far from the lower end 20.
When the folding state is achieved, the vertical rod springs 25 are in a compressed state, in the unfolding process, the vertical rod springs 25 stretch to push the vertical rod sliding blocks 21 to move towards the upper ends of the vertical rods 20, the vertical rod sliding blocks 21 push the two small diagonal web members 6 to open through the two supporting rods 22, the two small diagonal web members 6 exert force on the two large diagonal web members 5, the other two ends of the large diagonal web members 5 pull the two lower chords 18 to be in a straight state, and accordingly the two upper chords 4 are driven to be in a straight state, and therefore the unfolding unit achieves folding to unfolding.
Referring to fig. 9, the upper chord member 4 is an assembly, and mainly comprises a first straight rod 8 and a first joint 14, wherein the first straight rod 8 is a hollow round rod, and two ends of the first straight rod are respectively inserted into the first joint 14 and fixed by using pins. According to the principle of mechanics, in order to ensure that the components in the mechanism can be connected accurately and have a certain law of motion, the distance between the kinematic pairs of each component needs to be kept unchanged, and in the case of the upper chord 4 of the present invention, the distance between the first through holes 37 at the two ends of the first strut 8 needs to be kept unchanged. Therefore, in the actual manufacturing process, necessary tools are required to be designed to perform combined machining on the upper chord member 4 assembly, namely, after the first connector 14 is inserted into the first straight rod 8, the first fixing hole 36 is drilled in the tools, and then pins are driven into the tools, so that the accuracy of the installation of the upper chord member 4 assembly can be ensured.
Referring to fig. 10, the lower chord 18 is an assembly, and mainly comprises a second connector 31, a third connector 32 and a second straight rod 38, wherein the second straight rod 38 is a hollow round rod, and two ends of the second straight rod are respectively inserted into the second connector 31 and the third connector 32 and fixed at a second fixing hole 39 by using pins. This design advantageously ensures the accuracy of the structural dimensions of the bottom chord 18 and the distance between the two fourth through holes 40 is constant.
Referring to fig. 11, the large diagonal member 5 is an assembly, and mainly comprises a fourth joint 29, a fifth joint 30 and a third straight rod 41, wherein the third straight rod 41 is a hollow round rod, and two ends of the third straight rod are respectively inserted into the fourth joint 29 and the fifth joint 30 and fixed in a third fixing hole 42 by using pins. The design is beneficial to ensuring the accuracy of the structural dimension of the large diagonal web member 5 and ensuring the distance between the two fifth through holes 43 unchanged.
For convenient connection, as an improvement, the expandable unit 34 further comprises a vertical rod upper connecting block 7 and a vertical rod lower connecting block 19, the vertical rod upper connecting block 7 is fixedly connected to the upper end of the vertical rod 20, the vertical rod lower connecting block 19 is fixedly connected to the lower end of the vertical rod 20, the vertical rod upper connecting block 7 is of an I-shaped structure, two sides of the upper end of the vertical rod upper connecting block 7 are respectively and rotatably connected with the upper chord member 4, two sides of the lower end of the vertical rod upper connecting block 7 are respectively and rotatably connected with the small diagonal web member 6, and two ends, far away from the vertical rod 20, of the vertical rod lower connecting block 19 are respectively and rotatably connected with the lower chord member 18.
Specifically, the upper connecting block 7 of the vertical rod and the upper end of the vertical rod 20 form fixed connection through interference fit, and the lower connecting block 19 of the vertical rod is fixedly connected with the lower end of the vertical rod 20 through two bolts.
Referring to fig. 5, 7 and 8, the Y-shaped mechanism 35 includes a Y-shaped mechanism center pole 17, a Y-shaped mechanism upper chord pole 13, a Y-shaped mechanism large diagonal web pole 10 and a Y-shaped mechanism small diagonal web pole 11, the upper ends of the Y-shaped mechanism center poles 17 are rotatably connected with the two Y-shaped mechanism upper chord poles 13, the lower ends of the Y-shaped mechanism center poles 17 are rotatably connected with the two Y-shaped mechanism large diagonal web poles 10, the other ends of the two Y-shaped mechanism large diagonal web poles 10 are respectively rotatably connected with one Y-shaped mechanism small diagonal web pole 11, the other ends of the two Y-shaped mechanism small diagonal web poles 11 are respectively rotatably connected with the Y-shaped mechanism upper chord poles 13 on the corresponding side, a Y-shaped mechanism slider 16 and one Y-shaped mechanism spring 26 are sleeved on the Y-shaped mechanism center pole 17, the two ends of the Y-shaped mechanism spring 26 are respectively propped against the upper ends of the Y-shaped mechanism center pole 17 and the Y-shaped mechanism slider 16, the side surfaces of the Y-shaped mechanism slider 16 are rotatably connected with the two Y-shaped mechanism support bars 33, and the other ends of the two Y-shaped mechanism support bars 33 are respectively rotatably connected with the two Y-shaped mechanism large diagonal web poles 10 on the corresponding sides.
When the Y-shaped mechanism 35 is in a folded state, the Y-shaped mechanism spring 26 is in a compressed state, in the unfolding process, the Y-shaped mechanism spring 26 stretches to push the Y-shaped mechanism sliding block 16 to move towards the lower end of the Y-shaped mechanism center rod 17, push the two Y-shaped mechanism supporting rods 33 to be unfolded outwards, push the two Y-shaped mechanism large inclined web members 10 to be unfolded outwards, push the two Y-shaped mechanism small inclined web members 11 to be unfolded outwards through the action of a connecting structural force by the Y-shaped mechanism large inclined web members 10, and push the two Y-shaped mechanism small inclined web members 11 to be unfolded outwards to form a Y-shaped opening structure.
Referring to fig. 12, the y-shaped mechanism top chord 13 is an assembly, and mainly consists of a sixth joint 46, a fourth straight bar 45, a connecting member 12, and a fifth straight bar 44, and for this top chord 13, it is mainly ensured that the distance between the center of the second through hole 57 on the sixth joint 46 and the end face 47 of the fifth straight bar 44 is ensured, and the structure is combined and processed at the fourth fixing hole 56. The design is beneficial to ensuring the accuracy of the structural dimension of the upper chord 13 of the Y-shaped mechanism. The connecting member 12 is provided with a long strip hole, and the small inclined web member 11 of the Y-shaped mechanism is rotatably connected in the long strip hole of the connecting member 12.
Referring to fig. 13, the small web member 11 of the y-shaped mechanism is an assembly consisting essentially of a seventh joint 27, an eighth joint 28 and a sixth straight bar 48. The sixth straight rod 48 is a hollow round rod, two ends of the sixth straight rod are respectively inserted into the seventh joint 27 and the eighth joint 28, and for the small inclined web member 11 of the Y-shaped mechanism, the distance between the centers of the two third through holes 50 on the seventh joint 27 and the eighth joint 28 is mainly ensured, and the structure is combined and processed at the fifth fixing hole 49. The design is beneficial to ensuring the accuracy of the structural dimension of the small inclined web member 11 of the Y-shaped mechanism.
For convenient connection, the Y-shaped mechanism 35 further comprises an Y-shaped mechanism upper connecting block 9 and an Y-shaped mechanism lower connecting block 15, the Y-shaped mechanism upper connecting block 9 is fixedly connected to the upper end of the Y-shaped mechanism central rod 17, the Y-shaped mechanism upper connecting block 9 is rotatably connected with the two Y-shaped mechanism upper chords 13, the Y-shaped mechanism lower connecting block 15 is fixedly connected to the lower end of the Y-shaped mechanism central rod 17, the Y-shaped mechanism lower connecting block 15 is rotatably connected with the two Y-shaped mechanism large diagonal web members 10, and the Y-shaped mechanism upper connecting block 9 and the Y-shaped mechanism lower connecting block 15 are rotatably connected with the expandable unit 34.
Specifically, the upper end of the Y-shaped mechanism upper connecting block 9 is fixedly connected with the upper end of the Y-shaped mechanism central rod 17 through interference fit, and the lower end of the Y-shaped mechanism lower connecting block 15 is connected with the lower end of the Y-shaped mechanism central rod 17 through bolts.
Preferably, the rib units 2 are provided with 6.
The space-borne folded antenna reflector is contained in a payload cabin of a rocket when the rocket is launched, the rib unit 2 is in a fully folded state, the vertical rod spring 25 and the Y-shaped mechanism spring 26 are compressed and store certain elastic potential energy, and the total volume of the mechanism is minimum at the moment; after the satellite enters the orbit, the satellite-borne folded antenna reflector is unlocked according to the task instruction, and then the vertical rod spring 25 and the Y-shaped mechanism spring 26 respectively push the vertical rod sliding block 21 and the Y-shaped mechanism sliding block 16 to move along the vertical rod 20 and the Y-shaped mechanism center rod 17 at the same time, so that the basic unfolded unit 34 and the Y-shaped mechanism 35 are driven to be unfolded; the mechanism is provided with limiting structures at the joint of the small inclined web member 6 and the large inclined web member 5 and at the joint of the Y-shaped mechanism large inclined web member 10 and the Y-shaped mechanism small inclined web member 11, when the small inclined web member 6 and the large inclined web member 5, the Y-shaped mechanism large inclined web member 10 and the Y-shaped mechanism small inclined web member 11 respectively develop into a straight line, the mechanism reaches the limit position and is locked, and therefore the mechanism is converted into a stable structure.
In this embodiment, the space-borne folded antenna reflector introduces another structural form, i.e. a Y-shaped mechanism 35, on the basis of adopting the expandable unit 34 as a radially extending structure; the purpose of this design is mainly to consider that for this radiation type expandable antenna reflector, if only the expandable unit 34 is adopted, the effective structure at the edge of the antenna will become relatively sparse as the aperture of the antenna increases, so that the connection and tensioning of the reflecting net are not facilitated, and the shape surface accuracy of the antenna is difficult to ensure; after the Y-shaped mechanism 35 is mounted on the outer side of the expandable unit 34, the coverage of the structure can be greatly improved, and the weight of the structure can be effectively reduced. In addition, in order to meet the requirement of the antenna with larger caliber, the number of branches can be increased on the basis of the Y-shaped mechanism 35, or the circumferential number of the basic expandable units 34 can be increased, or the combination of the two can be adopted, so that the requirement can be better met.
In this embodiment, the rib unit 2 is a key structure for realizing unfolding of the folded antenna reflector, and is mainly composed of two assemblies of the expandable unit 34 and the Y-shaped mechanism 35, wherein each assembly is relatively independent and has an unfolding function, so that each of the expandable unit 34 and the Y-shaped mechanism 35 needs 1 power source to drive the expansion of the expandable unit; in consideration of the severe requirements of aerospace task on structural quality, the invention adopts a passive driving mode of a compression spring so as to reduce the structural quality as much as possible, and meanwhile, the driving mode avoids the complex structure of combining a motor with a screw rod for driving, and has the advantages of high reliability, good unfolding synchronism and the like.
In this embodiment, the central rod assembly 1 and the six rib units 2 are made of titanium alloy, magnesium alloy or carbon fiber in material selection, so that the weight of the antenna reflector mechanism is reduced, and the requirements of practical satellite tasks are met.
In this embodiment, each Y-shaped mechanism 35 is composed of two Y-shaped mechanism upper chords 13, so arranged as to meet the needs of most task situations. On the basis, the number of the upper chords 13 of the Y-shaped mechanism can be adaptively increased or decreased according to the change of tasks, so that a wider use effect is achieved.
EXAMPLE 2,
Referring to fig. 14, 15 and 16, the present embodiment provides a satellite system provided with the space navigation folding antenna reflector according to embodiment 1, which includes a satellite body 51, the space navigation folding antenna reflector 52 is connected to the satellite body 51 through a mechanical arm assembly 53, the mechanical arm assembly 53 is an open type multi-link mechanism, one end of the mechanical arm assembly 53 is rotatably connected to the satellite body 51, the other end is fixedly connected to the space navigation folding antenna reflector 52, and a locking release device 55 is further provided at one end of the mechanical arm assembly 53 connected to the space navigation folding antenna reflector 52. Two solar wings 54 are also symmetrically arranged on the side of the satellite body 51.
The outer contour of the satellite body 51 is in a cuboid shape, one side surface is connected with one end of the mechanical arm assembly 53, and the other two side surfaces are respectively connected with one solar wing 54; the mechanical arm assembly 53 is an open type multi-link mechanism, one end of which is connected with the satellite body 51 and forms a revolute pair; the other end is connected with the folded antenna reflector mechanism 52 and forms a fixed connection; the lock release 55 binds the folded antenna reflector mechanism 52 in or out.
The deployment process of the folded antenna reflector mechanism 52 of the present invention in space can be divided into two phases:
the first stage: when the satellite system enters the orbit, the mechanical arm assembly 53 is driven by a motor, and all components of the mechanical arm assembly 53 are sequentially opened to support the folded antenna reflector mechanism 52 to a working position;
the second stage: the lock release device 55 works to release the folded antenna reflector mechanism 52 in the folded state by binding and locking, the folded antenna reflector mechanism 52 is unfolded under the action of the driving force of the spring, and after the folded antenna reflector mechanism 52 is completely unfolded, the mechanism realizes rigidized locking and is converted into a stable structure by the mechanism.
The foregoing is merely illustrative of the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (7)
1. The aerospace folded antenna reflector is characterized by comprising a center rod assembly (1) and a plurality of rib units (2), wherein the center rod assembly (1) comprises a center rod (24), the plurality of rib units (2) are uniformly distributed in a radial shape by taking the center rod (24) as the center, each rib unit (2) comprises an expandable unit (34) and Y-shaped mechanisms (35), one end of the expandable unit (34) is rotationally connected with the center rod (24), the other end of the expandable unit is rotationally connected with the Y-shaped mechanisms (35), and the edge of a cable net is connected with each Y-shaped mechanism (35);
the expandable unit (34) comprises an upper chord member (4), a lower chord member (18), a vertical rod (20), large diagonal web members (5) and small diagonal web members (6), wherein two sides of the upper end of the vertical rod (20) are respectively and rotatably connected with the upper chord member (4), two small diagonal web members (6) are respectively and rotatably connected with the vertical rod (20) at the lower side of the two upper chord members (4), two lower chord members (18) are respectively and rotatably connected with two sides of the lower end of the vertical rod (20), a vertical rod sliding block (21) and a vertical rod spring (25) are sleeved on the vertical rod (20), two ends of the vertical rod spring (25) are respectively propped against the lower ends of the vertical rod sliding block (21) and the vertical rod (20), two ends of the vertical rod sliding block (21) are respectively and rotatably connected with a supporting rod (22), the other ends of the two supporting rods (22) are respectively and rotatably connected with the small diagonal web members (6) at the same side, one ends of the two small diagonal web members (6) far away from the vertical rod (20) are respectively and rotatably connected with the large diagonal web members (5) at the same side, one ends of the two large diagonal web members (5) far away from the lower chord members (20) are respectively, one ends of the small diagonal web members (4) far away from one end of the lower chord members (20) are respectively and rotatably connected with one end of the upper chord members (24), one end, far away from the vertical rod (20), of the other upper chord member (4) is rotationally connected with one side of the upper end of the Y-shaped mechanism (35), one end, far away from the vertical rod (20), of the one lower chord member (18) is rotationally connected with the lower end of the central rod (24), and one end, far away from the vertical rod (20), of the other lower chord member (18) is rotationally connected with one side of the lower end of the Y-shaped mechanism (35);
the Y-shaped mechanism (35) comprises a Y-shaped mechanism center rod (17), Y-shaped mechanism upper chord members (13), Y-shaped mechanism large inclined web members (10) and Y-shaped mechanism small inclined web members (11), wherein the upper ends of the Y-shaped mechanism center rods (17) are rotationally connected with the two Y-shaped mechanism upper chord members (13), the lower ends of the Y-shaped mechanism center rods (17) are rotationally connected with the two Y-shaped mechanism large inclined web members (10), the other ends of the two Y-shaped mechanism large inclined web members (10) are respectively rotationally connected with one Y-shaped mechanism small inclined web member (11), the other ends of the two Y-shaped mechanism small inclined web members (11) are respectively rotationally connected to the Y-shaped mechanism upper chord members (13) on the corresponding sides, a Y-shaped mechanism sliding block (16) and one Y-shaped mechanism spring (26) are sleeved on the Y-shaped mechanism center rod (17), two ends of the Y-shaped mechanism spring (26) are respectively propped against the upper ends of the Y-shaped mechanism center rods (17) and the Y-shaped mechanism sliding blocks (16), the side face of the Y-shaped mechanism sliding blocks (16) and the two Y-shaped mechanism sliding blocks (33) are respectively connected to the two Y-shaped mechanism center rods (33) on the corresponding sides of the two Y-shaped mechanism center rods (33);
the Y-shaped mechanism (35) further comprises an upper Y-shaped mechanism connecting block (9) and a lower Y-shaped mechanism connecting block (15), the upper Y-shaped mechanism connecting block (9) is fixedly connected to the upper end of the central Y-shaped mechanism rod (17), the upper Y-shaped mechanism connecting block (9) is rotationally connected with two upper Y-shaped mechanism chords (13), the lower Y-shaped mechanism connecting block (15) is fixedly connected to the lower end of the central Y-shaped mechanism rod (17), the lower Y-shaped mechanism connecting block (15) is rotationally connected with two large Y-shaped mechanism diagonal web members (10), and the upper Y-shaped mechanism connecting block (9) and the lower Y-shaped mechanism connecting block (15) are rotationally connected with the expandable unit (34).
2. The aerospace folded antenna reflector according to claim 1, wherein the central rod assembly further comprises a central rod upper connecting block (3) and a central rod lower connecting block (23), the central rod upper connecting block (3) is fixedly connected to the upper end of the central rod (24), the central rod lower connecting block (23) is fixedly connected to the lower end of the central rod (24), the central rod upper connecting block (3) and the central rod lower connecting block (23) are of petal-shaped structures, the outer side of the central rod upper connecting block (3) is rotatably connected with one side of the upper end of each expandable unit (34), and the outer side of the central rod lower connecting block (23) is rotatably connected with one side of the lower end of each expandable unit (34).
3. The aerospace folded antenna reflector according to claim 1, wherein the expandable unit (34) further comprises an upper vertical rod connecting block (7) and a lower vertical rod connecting block (19), the upper vertical rod connecting block (7) is fixedly connected to the upper end of the vertical rod (20), the lower vertical rod connecting block (19) is fixedly connected to the lower end of the vertical rod (20), the upper vertical rod connecting block (7) is of an I-shaped structure, two sides of the upper end of the upper vertical rod connecting block (7) are respectively and rotatably connected with the upper chord member (4), two sides of the lower end of the upper vertical rod connecting block (7) are respectively and rotatably connected with the small diagonal web member (6), and two ends, far away from the vertical rod (20), of the lower vertical rod connecting block (19) are respectively and rotatably connected with the lower chord member (18).
4. The aerospace folded antenna reflector according to claim 1, wherein one connecting member (12) is respectively arranged at the positions where the two Y-shaped mechanism upper chords (13) are connected with the Y-shaped mechanism small diagonal web members (11), long strip holes are formed in the connecting member (12), and the Y-shaped mechanism small diagonal web members (11) are rotatably connected in the long strip holes of the connecting member (12).
5. An aerospace folded antenna reflector according to claim 1, wherein the rib elements (2) are provided in 6.
6. The satellite system is characterized by comprising the aerospace folded antenna reflector according to claim 1, 2, 3, 4 or 5, and comprising a satellite body (51), wherein the aerospace folded antenna reflector (52) is connected to the satellite body (51) through a mechanical arm assembly (53), the mechanical arm assembly (53) is an open type multi-link mechanism, one end of the mechanical arm assembly (53) is rotatably connected to the satellite body (51), the other end of the mechanical arm assembly is fixedly connected with the aerospace folded antenna reflector (52), and a locking and releasing device (55) is further arranged at one end, connected with the aerospace folded antenna reflector (52), of the mechanical arm assembly (53).
7. Satellite system according to claim 6, characterized in that on the side of the satellite body (51) there are also symmetrically provided two solar wings (54).
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| CN113675615A (en) | 2021-11-19 |
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