阅读说明：本技术 可折叠空间天线在轨展开自锁定驱动铰链及其控制方法 (Foldable space antenna on-orbit unfolding self-locking driving hinge and control method thereof ) 是由 李�昊 李奇 杜宣 赵枝凯 于 2020-12-07 设计创作，主要内容包括：本发明提供了一种可折叠空间天线在轨展开自锁定驱动铰链,包括：开孔复合材料管,第一封口接头和第二封口接头。第一封口接头和第二封口接头分别与开孔复合材料管胶结；驱动铰链折叠时,为折叠状态S1；所述驱动铰链释放时,为展开状态S2；开孔复合材料管的侧面为贯穿式梯形开孔,通过梯形形式的开孔降低折叠状态S1下驱动铰链的最大应力。本发明能够实现大型空间可折叠天线结构的在轨展开驱动及在轨锁定。可折叠空间天线在轨展开自锁定复合材料驱动铰链,通过开孔复合材料管件作为驱动元件,具有展开后自锁特性、恒驱动扭矩特性及无间隙特性；本发明无复杂的结构部件、机构部件及锁定装置,具有结构简单、无间隙、质量轻、可靠性高的特点。(The invention provides a foldable space antenna on-orbit unfolding self-locking driving hinge, which comprises: the composite pipe with the opening comprises a composite pipe with the opening, a first sealing joint and a second sealing joint. The first sealing joint and the second sealing joint are respectively glued with the perforated composite material pipe; when the hinge is driven to fold, the folding state is S1; when the driving hinge is released, the driving hinge is in an unfolding state S2; the side of the perforated composite pipe is a through type trapezoid perforated hole, and the maximum stress of the driving hinge under the folding state S1 is reduced through the trapezoid type perforated hole. The invention can realize the on-track unfolding drive and on-track locking of the large-size space foldable antenna structure. The foldable space antenna is unfolded on the track and is a self-locking composite material driving hinge, and the composite material pipe fitting with the opening is used as a driving element, so that the foldable space antenna has the characteristics of self-locking after being unfolded, constant driving torque and no gap; the invention has no complex structural parts, mechanism parts and locking devices, and has the characteristics of simple structure, no gap, light weight and high reliability.)

1. A foldable space antenna in-orbit unfolding self-locking driving hinge is characterized by comprising: the hole-opening composite pipe comprises a hole-opening composite pipe (1), a first sealing joint (2) and a second sealing joint (3), wherein the first sealing joint (2) and the second sealing joint (3) are respectively and fixedly connected with the hole-opening composite pipe (1);

the side of the perforated composite material pipe (1) is provided with a through type trapezoid perforated hole, and the maximum stress of the driving hinge in a folded state is reduced through the through type trapezoid perforated hole.

2. The foldable spatial antenna in-orbit unfolding self-locking driving hinge according to claim 1, wherein the perforated composite material pipe (1) is a nonlinear elastic driving element and can realize constant-torque rotation.

3. A foldable space antenna in-track deployment self-locking composite driven hinge according to claim 1, characterized in that the upper and lower surfaces of the open-cell composite tube (1) have a plurality of through-going rectangular openings.

4. The foldable space antenna in-track unfolding self-locking composite material driving hinge as claimed in claim 1, wherein the cross section of the open pore composite material tube (1) is a rectangular cross section with rounded corners, and the driving hinge can be self-locked when the driving hinge is in an unfolded state S2.

5. The foldable space antenna in-orbit unfolding self-locking composite material driving hinge is characterized in that the open pore composite material pipe (1) is made of fiber reinforced resin matrix composite materials.

6. The foldable space antenna on-track unfolding self-locking composite material driving hinge as claimed in claim 1, wherein the first sealing joint (2) and the second sealing joint (3) enable the perforated composite material pipe (1) to be free from buckling deformation at two ends in the folded state S2 and provide an external interface of the driving hinge.

7. The foldable space antenna in-track deployment self-locking composite-material-driven hinge of claim 1, wherein the lower base of the through-going trapezoidal-shaped opening is inside the bending direction of the driven hinge.

8. The foldable space antenna on-track unfolding self-locking composite material driving hinge is characterized in that the through type trapezoid opening enables the open composite material pipe to be elastically bent and deformed under the action of external torque, and then the first sealing joint (2) and the second sealing joint (3) rotate relatively.

9. The foldable space antenna in-track unfolding self-locking composite material driving hinge as claimed in claim 1, wherein the number of through rectangular openings can adjust the driving torque of the open composite material tube (1) in the folded state S2.

10. A method of controlling an in-orbit unfolding self-locking composite-driven hinge of a foldable space antenna according to claims 1-9,

when the driving hinge is folded, the driving hinge is in a folded state S1; when the driving hinge is released, the driving hinge is in an unfolding state S2;

the perforated composite material pipe (1) can generate elastic bending deformation under the action of external force, and the perforated composite material pipe (1) stores elastic potential energy when the driving hinge is in a folding state S1;

when the driving hinge is in the unfolding state S2, the open pore composite material pipe (1) releases the stored elastic potential energy;

when the folding angle of the hinge is continuously increased, the driving torque of the driving hinge is reduced to a stable value, and the constant torque characteristic is realized;

when the initial local peak value of the driving torque of the hinge plays a threshold role, the hinge is in an unfolding state S2, and initial starting torque is applied to enable the hinge to be initially folded, so that the self-locking hinge has a self-locking characteristic.

Technical Field

The invention relates to the technical field of space antenna on-track unfolding drive, in particular to a foldable space antenna on-track unfolding self-locking drive hinge and a control method thereof, and particularly relates to a foldable space antenna on-track unfolding self-locking composite material drive hinge and a control method thereof.

Background

With the development of science and technology, the demand of various industries on the prior ground remote sensing satellite is continuously increased, and the requirement on the observation resolution is continuously improved. At present, a ground remote sensing satellite generally uses a large-scale high-precision antenna to receive electromagnetic waves emitted by a ground observed object, and realizes ground remote sensing through analysis of the electromagnetic waves. With the improvement of the earth observation resolution, the requirements on the area and the surface precision of the reflecting surface of the satellite antenna are higher and higher. In a limited enveloping space of a carrier rocket, a large-scale satellite-borne antenna needs to be folded and folded in a launching state, and a satellite is released and unfolded after being in orbit. After the large antenna is unlocked in the on-track mode, the large antenna is driven to unfold in the on-track mode through potential energy stored in the hinge. Meanwhile, after the antenna is unfolded in place, the hinge is locked by the locking device on the antenna hinge, so that the antenna is stabilized in an unfolded state. Therefore, a light, simple and reliable driving hinge is the basis for the development of a large-area high-precision foldable space antenna.

Through search, currently, a driving hinge with a foldable space structure is generally a metal hinge driven by a linear spring, and patent document CN108767416A discloses that a connecting arm, a central rotating shaft, a base rotating shaft, a sliding rotating shaft, a latch bolt, a locking hole, a locking pin, a driving coil spring and the like have a plurality of moving parts, and an additional locking device is equipped on the hinge, so that the overall structure is complex. Patent document CN103953639A discloses a locking pin, a connecting rod, a locking swing rod, a crank rotating shaft, a hinge rotating shaft, a guide rail, etc., which is required to ensure that the driving torque of the hinge is always greater than the resisting torque of the hinge during the unfolding process of the foldable space structure. Patent document CN103253383A discloses a plurality of components such as a movable hinge, a fixed hinge, a concentric shaft, a spiral spring, a lubrication pad, and a spring catch, and when a driving component in a metal hinge is a linear spring, the driving torque of the hinge is continuously reduced as the rotation angle of the hinge increases. Therefore, when the linear spring is adopted to drive the hinge, the initial driving moment of the hinge is far larger than the resisting moment of the hinge in unfolding so as to ensure that the driving moment of the hinge in the unfolding process is always larger than the resisting moment. An excessive initial driving torque will put higher requirements on the strength and rigidity of the whole hinge, and is not beneficial to the light weight and reliability of the hinge. Metal hinges typically include a plurality of movable members for relative rotation, with the rotatable members connected by pins. Under the limitation of machining precision, a certain gap is usually formed between a pin hole and a pin of the metal hinge, so that the metal hinge is difficult to maintain an absolutely rigid connection after unfolding and locking. When the number of hinges in a large-sized space folded antenna is large, the gap in the conventional metal hinge has an adverse effect on the overall shape accuracy of the antenna, which is difficult to predict. The driving hinge with the existing foldable space structure usually comprises an additional set of self-locking device, and when the hinge is unfolded to a proper position, the locking pin or the locking block is driven to reset through an internal elastic part, so that the driving hinge is locked. The additional self-locking device will obviously increase the overall weight and complexity of the driving hinge, which is not beneficial to the light weight and reliability of the hinge. Therefore, for future large-scale foldable space antennas with high surface precision, it is difficult to achieve the design requirements of light weight, high precision and high reliability of the antennas by using the conventional metal hinge based on linear springs.

In summary, the on-orbit unfolding driving and locking requirements of the foldable space antenna can be met, and the driving hinge with high reliability, high precision, simplicity and light weight is important for realizing the ultra-large high-precision foldable space antenna in China and is a problem which needs to be solved at the present stage of China. In the invention disclosed at the present stage in China, hinges applied to on-track unfolding and locking of foldable structures in different spaces are mostly variable-torque metal hinges based on linear springs, and have more hinge parts and complex structures, so that assembly gaps cannot be eliminated, and self-locking cannot be realized.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an on-track unfolding self-locking driving hinge of a foldable space antenna and a control method thereof. Compared with the prior art, the invention has the obvious difference that the invention has the characteristics of simple structure, light weight, constant torque, no gap and self-locking.

According to the invention, the foldable space antenna on-orbit unfolding self-locking driving hinge provided by the invention comprises: the device comprises a perforated composite material pipe, a first sealing joint and a second sealing joint, wherein the first sealing joint and the second sealing joint are respectively and fixedly connected with the perforated composite material pipe; the side of trompil combined material pipe is provided with the trapezoidal trompil of through-going formula, reduces the maximum stress of drive hinge under fold condition through the trapezoidal trompil of through-going formula.

Preferably, the open-pore composite pipe is a nonlinear elastic driving element capable of realizing constant-torque rotation.

Preferably, the upper and lower surfaces of the open-cell composite tube have a plurality of through-going rectangular openings.

Preferably, the cross-section of the open-cell composite tube is a rectangular cross-section with rounded corners, and the driving hinge is capable of self-locking when the driving hinge is in the unfolded state S2.

Preferably, the open-cell composite tube is made of a fiber reinforced resin matrix composite.

Preferably, the first and second sealing joints are configured such that the open-cell composite tube is not buckled at both ends in the folded state S2 and provide an external interface for driving the hinge.

Preferably, the lower base of the through-going trapezoidal opening is inboard of the direction of bending of the drive hinge.

Preferably, the through trapezoidal hole enables the open pore composite material pipe to generate elastic bending deformation under the action of external torque, and then the first sealing joint and the second sealing joint generate relative rotation.

Preferably, the number of through-going rectangular apertures is capable of adjusting the drive torque at open-cell composite tube folding state S2.

According to the control method for the on-track unfolding self-locking composite material driving hinge of the foldable space antenna, provided by the invention, when the driving hinge is folded, the driving hinge is in a folded state S1; when the driving hinge is released, the unfolding state is S2;

the perforated composite material pipe can generate elastic bending deformation under the action of external force, and the perforated composite material pipe stores elastic potential energy when the driving hinge is in a folding state S1; driving the hinge in the deployed state S2, the open-cell composite tube releasing the stored elastic potential energy;

when the folding angle of the hinge is continuously increased, the driving torque of the driving hinge is reduced to a stable value, and the constant torque characteristic is realized;

when the initial local peak value of the driving torque of the hinge plays a threshold role, the hinge is in an unfolding state S2, and initial starting torque is applied to enable the hinge to be initially folded, so that the self-locking hinge has a self-locking characteristic.

The constant-torque self-locking composite material driving hinge of the foldable space antenna has the function of realizing on-track unfolding driving and locking after unfolding of the large high-precision foldable space antenna.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can realize constant torque driving by adopting the perforated composite material pipe as a driving element. The driving hinge of the traditional foldable space structure adopts a spring as a driving element, and the driving torque linearly changes along with the folding angle of the hinge, so that constant-torque driving cannot be realized.

2. The invention is of an integrated structure, has no problem of assembly clearance in a conventional hinge, can realize gapless connection of a space foldable antenna structure, and ensures the precision of the large-scale space antenna structure after being unfolded. The driving hinge of the traditional foldable space structure usually adopts a metal pin to realize the connection of rotating elements, and zero-gap assembly cannot be realized among all the rotating elements, so that the precision of the foldable space structure after being unfolded is influenced.

3. According to the invention, the bending starting moment of the perforated composite material pipe is larger, so that the hinge has a self-locking function after being integrally reset and unfolded, an additional locking device is not required, and the integral structure is simpler and more reliable. In a conventional driving hinge with a foldable space structure, an additional locking mechanism is usually included to achieve locking after the hinge is unfolded, which is cumbersome.

4. In the invention, the main driving part is a composite material perforated thin-wall rod piece, so the weight is lighter. The driving hinge of the conventional foldable space structure is usually made of metal material, and has relatively large weight.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic overall appearance of the present invention.

FIG. 2 is an exploded view of the present invention.

FIG. 3 is a side view and a front-to-back view of the present invention.

Fig. 4 is a schematic external view in a folded state according to the present invention.

Fig. 5 is a schematic view of an exemplary drive torque curve of the present invention.

In the figure: the pipe is characterized in that 1 is an open-pore composite material pipe, 2 is a sealing joint, and 3 is a sealing joint.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

As shown in fig. 1 to 4, the present embodiment provides a foldable space antenna in-orbit unfolding self-locking driving hinge, including: the composite pipe comprises a perforated composite pipe 1, a first sealing joint 2 and a second sealing joint 3. The first sealing connector 2 and the second sealing connector 3 are respectively inserted into the perforated composite material pipe 1 from two ends, and the first sealing connector 2 and the second sealing connector 3 are connected with the perforated composite material pipe 1 in a gluing mode. The section of the perforated composite material pipe 1 is a rectangular section with round corners; the side surface of the perforated composite material pipe 1 is provided with trapezoidal holes, the trapezoidal holes enable the perforated composite material pipe 1 to be subjected to bending deformation, and local stress in the composite material pipe can be guaranteed to be lower than material strength; the front side and the back side of the open pore composite material pipe 1 are provided with a plurality of rectangular open pores, and the driving torque of the invention is adjusted by adjusting the number of the rectangular open pores; the first sealing joint 2 and the second sealing joint 3 are respectively and rigidly connected with different modules of the space large-scale foldable antenna.

Then is combined withPreferred embodiment(s) of the inventionThe present invention will be further explained.

The lay-up of the open-celled composite pipe 1 is [45/-45/45/-45/-45/45/-45/45 ];

the wall thickness of the open pore composite material pipe 1 is 1 mm;

the length and width of the section of the open-pore composite material pipe 1 are 60mm multiplied by 100 mm;

the section fillet radius of the open-pore composite material pipe 1 is 25 mm;

the rectangular opening size of the open-pore composite material pipe 1 is 20mm multiplied by 40 mm;

the size of the upper bottom edge of the trapezoidal opening is 100mm, the size of the lower bottom edge of the trapezoidal opening is 280mm, and the height of the trapezoidal opening is 46 mm;

the upper surface and the lower surface of the perforated composite material pipe 1 are respectively provided with 5 rectangular holes;

the sealing joint 2 and the sealing joint 3 are made of aluminum alloy materials;

the open-pore composite material pipe 1 is prepared from a T300/epoxy resin matrix prepreg by adopting an autoclave process.

At a plurality ofVariation exampleIn the composite material tube, the rectangular openings on the upper surface and the lower surface of the composite material tube can be multiple, so that the composite material tube can be suitable for foldable antennas with different sizes.

The driving torque curve of the hinge in this embodiment is shown in fig. 5, the restoring torque changes with the change of the hinge angle, and when the torque reaches the peak value, the influence of the increase of the hinge angle on the torque is small, and the effect of constant torque is achieved.

The working principle is as follows:

the invention adopts the composite material pipe fitting with trapezoidal and rectangular openings as the folding driving part of the hinge. The composite pipe after being holed can generate elastic bending deformation under the action of external force. The perforated composite pipe stores elastic potential energy in the hinge folding state. When the hinge is released, the hinge is driven by the elastic potential energy stored in the open-pore composite material pipe to be restored to the unfolded state. According to the invention, the short side of the perforated composite material pipe adopts the trapezoidal perforated holes, the trapezoidal perforated holes can effectively reduce the maximum stress level of the hinge in a folded state, and the strength damage of the perforated composite material pipe in the folded state is avoided. The rectangular open holes are formed in the long edges of the open hole composite material pipe, the rigidity of the whole hinge in a folded state is adjusted by increasing or reducing the number of the rectangular open holes, and then the driving moment of the whole hinge is adjusted. The folding angle-drive torque curve of the present invention is shown in fig. 5. In the present invention, the drive torque of the hinge will have a locally larger peak when the folding angle of the hinge is initially increased. As the folding angle of the hinge is increased, the driving torque of the hinge is reduced to a stable value, and the constant torque characteristic of the invention is realized. In the invention, the initial local peak value of the driving torque of the hinge plays a role of a threshold value, and the hinge can be initially folded only by applying a larger initial starting torque in an unfolding state, so that the hinge has a self-locking characteristic.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.