High-ratio folding mechanism for ring reflector antenna

Abstract

The application discloses a high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism, which comprises an annular scissor mechanism, a center unfolding and folding mechanism, a radial support rod, an annular slide rail and a driving rope. One end of the radial support rod is connected with a base of the center unfolding and folding mechanism, and the other end is connected with the annular scissor mechanism. The radial support rod is first stretched and locked. One end of the driving rope is fixed with the annular scissor mechanism, and the other end is fixed with the annular slide rail. The annular slide rail is fixed with the center unfolding and folding mechanism. The center unfolding and folding mechanism is unfolded, and the driving rope is pulled. Under the action of the driving rope, the annular scissor mechanism can be unfolded from one piece to a larger area. The high folding and unfolding ratio rigid annular reflector antenna folding and unfolding mechanism can ensure that the antenna reflector has a larger area after being unfolded and has a smaller volume when being folded.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of machinery and relates to a high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism which can realize the folding and unfolding of the annular reflector antenna. BACKGROUND

[0002] The increasing demand of users such as communication, navigation and remote sensing promotes the satellite constellation to become the inevitable development of the satellite application system. The link construction between satellites makes the inter-satellite data need to be transmitted by high-frequency electromagnetic waves, and at the same time has excellent electrical properties such as high bandwidth, high gain and high signal-to-noise ratio. In order to meet the above electrical property requirements, the reflector antenna needs to have the characteristics of large aperture and high surface precision. The solid surface reflector is widely used in the aperture antenna of the satellite because of its very high surface precision, however, due to the limitation of the internal space of the launch vehicle, the traditional solid surface reflector antenna is difficult to be accommodated in the fairing of the launch vehicle, the structure form leads to the limitation and poor storage performance, and thus the aperture of the antenna cannot be improved, which affects the application range of the antenna. In addition, the microwave payload of the feed reflector system can be designed in the form of an annular reflector under the condition that the total area of the antenna is constant, which can realize the effect of increasing the aperture and improving the resolution. Therefore, the structure form of the annular solid surface reflector which can be folded and unfolded can effectively increase the aperture while reducing the storage volume. SUMMARY

[0003] In view of the above problems, the application provides a high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism which can realize the folding and unfolding of the annular reflector antenna, so that the antenna has a small volume in the folded state and has a large reflecting area after being completely unfolded.

[0004] The high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism comprises an annular scissor mechanism, a central folding and unfolding mechanism, a radial support rod and a slide rail rope mechanism.

[0005] The annular scissor mechanism is composed of a plurality of scissor units which are connected and combined with each other; the scissor units are divided into six types, including a middle scissor unit, a left side scissor unit, a right side scissor unit, a common scissor unit, a scissor unit with a lock seat and a scissor unit with a lock tongue.

[0006] The middle scissor unit, the left side scissor unit, the right side scissor unit and the common scissor unit have the same structure and comprise a reflector panel and a C-shaped rod. The reflector panel has a fan-shaped structure and is circumferentially embedded with five metal embedded parts, which are a metal embedded part (M1) at a top edge left side included angle position, a metal embedded part (M2) at a top edge center position, a metal embedded part (M3) at a bottom edge left side included angle position, a metal embedded part (M4) at a bottom edge center position and a metal embedded part (M5) at a bottom edge right side included angle position.

[0007] The C-shaped rod is composed of four carbon fiber rods and five columnar metal bosses; the four carbon fiber rods are respectively rods (L1) to (L4); and the five metal bosses are respectively (B1) to (B5). Among them, the rod (L1) is arranged along the side edge of the reflecting panel, and one end is fixed to the side of the metal boss (B1); the other end of the rod (L1) is fixed to the side of the metal boss (B2); the rods (L3) and (L4) are arc-shaped rods arranged along the inner arc of the reflecting panel, one end of the rod (L3) is fixed to the side of the metal boss (B3), and the other end is fixed to the side of the metal boss (B4); one end of the rod (L4) is fixed to the side of the metal boss (B4), and the other end is fixed to the side of the metal boss (B5); the rod (L2) is arranged perpendicular to the rods (L1) and (L3), and the two ends are respectively fixed to the sides of the metal bosses (B2) and (B3); in the C-shaped rod with the above structure, the metal boss (B1) and the protruding shaft sleeve of the metal embedded part (M2) form a rotating pair; the metal boss (B4) and the protruding shaft of the metal embedded part (M4) are coaxially sleeved to form a rotating pair.

[0008] The difference between the lock seat fork unit structure and the foregoing fork unit is that the lock seat fork unit has four metal embedded parts, and the C-shaped rod is designed with a lock seat, and the connection relationship between the C-shaped rod and the metal embedded part is changed; among them, the metal embedded part part does not have a metal embedded part (M5); the metal bosses (B2) and (B3) in the C-shaped rod are replaced by lock seats.

[0009] The difference between the lock tongue fork unit structure and the foregoing ordinary annular fork unit is that the lock tongue fork unit has three metal embedded parts, and the C-shaped rod is increased with a rod (L5), and a lock head is additionally provided; among them, the metal embedded part part does not have metal embedded parts (M1) and (M3). The rod (L5) is an arc-shaped rod arranged along the outer arc of the reflecting panel, and the end is connected with the side of the metal boss B1; the lock head is two, installed at the ends of the rods (L5) and (L4), used for cooperating with the lock seat to realize the locking between the lock seat fork unit and the lock tongue fork unit.

[0010] The above-mentioned structures of each fork unit are connected to each other to form an overall annular fork mechanism. Among them, the left and right ends of the annular fork unit are respectively a lock seat fork unit and a lock tongue fork unit; the middle is a middle fork unit; the left and right adjacent fork units of the middle fork unit are respectively a left fork unit and a right fork unit; the left fork unit and the lock seat fork unit, and the right fork unit and the lock tongue fork unit are all a plurality of ordinary fork units connected with each other. The connection mode of each adjacent fork unit is:

[0011] The protruding rods of the metal inserts (M1) and (M3) in the right scissor unit are respectively inserted into the openings on the metal bosses (B2) and (B3) in the left adjacent scissor unit, and the rotating pairs are formed by the bearing connection in the openings; the metal boss (B5) in the right scissor unit is matched with the opening on the metal insert (M5) in the left adjacent scissor unit, and the rotating pair is formed by the bearing connection in the opening.

[0012] The above-mentioned ring-shaped scissor mechanism can be gradually folded by the rotation between each rotating pair, so that the reflective panels of each scissor unit are in a storage state of being stacked. By reversing the rotation of each rotating pair, the reflective panels of each scissor unit are gradually unfolded until the two latches in the scissor unit with latches are respectively inserted into the scissor unit with lock seat to be locked, at this time the ring-shaped scissor mechanism is completely unfolded to be ring-shaped.

[0013] The center unfolding and folding mechanism is a double-layer cylindrical structure, and the locking between the inner cylinder and the outer cylinder is realized by the locking assembly when the inner cylinder extends to the limit position; the center unfolding and folding mechanism is connected with the ring-shaped scissor mechanism through radial support rods; the radial support rods include three support rods and two radial support joints; the three support rods are connected through the radial support joints; the two radial support joints realize the 90° rotation between the adjacent two support rods. The ends of the whole support rod are fixed on the bottom of the outer cylinder of the center unfolding and folding mechanism; the front end is fixed on the end of the protruding shaft of the metal boss (B4) in the middle scissor unit; the radial support rod is affected by the torsional spring in the two radial support joints, so that the radial support rod joint can be automatically unfolded by the torque of the torsional spring. In the folded state of the radial support rod, the end support rod and the front end support rod are in a horizontal state, and the middle support rod is in a vertical state; during the unfolding process, one radial support joint is rotated by 90° and locked, so that the middle support rod is rotated downward from the vertical state to the coaxial state with the end support rod; at the same time, the other radial support joint is rotated by 90° and locked, so that the front end support rod is rotated upward from the vertical state with the middle support rod to the coaxial state with the middle support rod, at this time the radial support rod is completely unfolded, and the three support rods are coaxial.

[0014] The slide rail rope mechanism includes two ring-shaped slide rails and multiple ropes. The two ring-shaped slide rails are respectively sleeved and fixed on the top of the inner cylinder and the bottom of the outer cylinder; there are m slide blocks in each of the ring-shaped slide rails on the top of the inner cylinder and the bottom of the outer cylinder, wherein the m slide blocks of the ring-shaped slide rail on the top of the inner cylinder are respectively connected and fixed with the sliding ends of m ropes, and the other ends are respectively fixed with the hanging ring nuts installed on the protruding shafts of the m metal inserts (M5) in the scissor units which are equally spaced in the circumferential direction. The number of m is determined according to the number of scissor units; the interval number should be as much as possible to make the m ropes circumferentially arranged evenly after the ring-shaped scissor mechanism is unfolded.

[0015] The m sliders of the lower part annular slide rail of the outer cylinder are respectively connected and fixed with the sliding ends of another m ropes, and the other ends are respectively fixed with the hanging ring nuts installed on the extended shafts of the metal embedded parts (M3) of the m scissor units adjacent to the aforementioned m scissor units.

[0016] In the folded state of the high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism, each scissor unit is folded in a stacked manner, the radial support rods are in a Z-shaped folded state, and the inner cylinder is located inside the outer cylinder; this makes the overall folding and unfolding mechanism maintain this contracted state; in this state, the middle support rods of the radial support are positioned by the compression and release mechanisms installed on the side wall of the outer cylinder, and the contraction state of the overall folding and unfolding mechanism is maintained; in the specific process of unfolding from the folded state, first, the radial support rods are unlocked, the radial support rods are automatically unfolded to a horizontal straight rod state under the action of the torsional springs in the radial support joints, and are locked. Then, the inner cylinder is extended out of the outer cylinder, and during the entire extension process, the upper and lower annular slide rails move along the circumference of the annular slide rails, and then the driving ropes connected with the sliders pull the annular scissor mechanism to unfold; during the unfolding process of the annular scissor mechanism, when the inner cylinder and the outer cylinder are unfolded to the position, the center folding and unfolding mechanism applies sufficient pre-tightening force to the ropes, so that the scissor mechanism with the locking tongue and the scissor mechanism with the locking seat are locked with each other, and the entire unfolding process is completed.

[0017] The advantages of the present application are that:

[0018] 1. The high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism can make the antenna have a small volume in the folded state and a large reflector area in the fully unfolded state;

[0019] 2. In the high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism, the center folding and unfolding mechanism can realize smooth unfolding of the deployable mechanism through a set of rope driving system;

[0020] 3. The high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism can make the spherical center of the annular scissor mechanism always be on the axis of the center folding and unfolding mechanism;

[0021] 4. The high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism can fit a specified rotating paraboloid when fully unfolded, and has a signal converging effect;

[0022] 5. In the high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism, the annular scissor mechanism is driven to unfold through the circumferentially arranged ropes, and the drive is placed on the installation base, effectively reducing the weight of the moving annular scissor mechanism;

[0023] 6. In the high folding and unfolding ratio annular reflector antenna folding and unfolding mechanism, the annular scissor mechanism is butt-jointed and locked, and has a certain design margin to ensure reliable locking when there is a certain deviation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The fully folded state of the folding antenna of the present application;

[0025] Figure 2 The fully unfolded state of the folding antenna of the present application;

[0026] Figure 3 The fully unfolded state of the ring-shaped scissor mechanism in the folding antenna of the present application;

[0027] Figure 4 The structure of the scissor unit in the ring-shaped scissor mechanism;

[0028] Figure 5 The structure of the scissor unit with a lock seat in the ring-shaped scissor mechanism;

[0029] Figure 6 The structure of the scissor unit with a lock tongue in the ring-shaped scissor mechanism;

[0030] Figure 7 The structure of the lock seat in the scissor unit with a lock seat;

[0031] Figure 8 The structure of the lock tongue in the scissor unit with a lock tongue;

[0032] Figure 9 The locking method of the scissor unit with a lock seat and the scissor unit with a lock tongue;

[0033] Figure 10 The connection method of the scissor units in the ring-shaped scissor mechanism;

[0034] Figure 11 The non-horizontal state of the folding antenna of the present application after unfolding without the swing limiting mechanism;

[0035] Figure 12 The structure of the center unfolding mechanism in the folding antenna of the present application;

[0036] Figure 13 The installation position of the locking assembly, guide wheel and wire on the inner cylinder in the center unfolding mechanism;

[0037] Figure 14 The structure of the locking assembly in the center unfolding mechanism;

[0038] Figure 15 The internal structure of the locking assembly in the center unfolding mechanism;

[0039] Figure 16 The installation position of the locking assembly, guide wheel and wire on the outer cylinder in the center unfolding mechanism;

[0040] Figure 17Figure 1 is a schematic diagram of the cooperation between the inner tube and the outer tube in the central deployment mechanism;

[0041] Figure 18 Figure 2 is a schematic diagram of the base structure of the outer tube in the central deployment mechanism;

[0042] Figure 19 Figure 3 is a schematic diagram of the rope driving mechanism in the central deployment mechanism;

[0043] Figure 20 Figure 4 is a schematic diagram of the driving rope winding mode in the central deployment mechanism;

[0044] Figure 21 Figure 5 is a schematic diagram of the radial support rod structure in the folding and deploying antenna of the present application;

[0045] Figure 22 Figure 6 is a schematic diagram of the radial support joint structure in the radial support rod;

[0046] Figure 23 Figure 7 is a schematic diagram of the joint locking process in the radial support rod;

[0047] Figure 24 Figure 8 is a schematic diagram of the joint locking state in the radial support rod;

[0048] Figure 25 Figure 9 is a schematic diagram of the radial support rod connecting assembly structure;

[0049] Figure 26 Figure 10 is a schematic diagram of the locking mode of the radial support rod connecting assembly;

[0050] Figure 1:

[0051] 1 - annular scissors mechanism 2 - central deployment mechanism 3 - radial support rod

[0052] 4 - radial support connecting assembly

[0053] 101 - scissors unit 101a - intermediate scissors unit 101b - left scissors unit

[0054] 101c - right scissors unit 101d - ordinary scissors unit 101e - scissors unit with lock seat

[0055] 101f - scissors unit with lock tongue 1a - reflector panel 1b - C-shaped rod

[0056] 1c - lock seat 1d - lock tongue 1c1 - connecting body

[0057] 1c2 - flared mouth structure 1c3 - locking channel A 1c4 - locking channel B1c5 - lock head 1c6 - spring 1c7 - limiting plate

[0058] 102 - swing limiting mechanism 102a - joint 102b - carbon fiber rod A102c - carbon fiber rod B 102d - connecting joint 102e - limiting shaft

[0059] 201 - inner cylinder 202 - outer cylinder 201a - upper flange of inner cylinder

[0060] 201b - lower flange of inner cylinder 201c - guide groove 202a - upper flange of outer cylinder

[0061] 202b - base of outer cylinder 202b1 - base wire wheel 203a - pulley

[0062] 203b - pulley shaft 203c - lock head 203d - lock seat

[0063] 203e - lock seat cover 203f - spring 204a - transmission gear set

[0064] 204b - winding drum 204c - drive motor 204d - speed reducer

[0065] 204e - base wire wheel 204f - partition 204g - limiting baffle 204h - support A 204i - support B 204j - support C

[0066] 301 - support rod 302 - radial support joint 302a - joint with lock seat 302b - joint shaft 302c - joint with lock tongue 302d - shaft sleeve A

[0067] 302e - top spring A 302f - joint synchronization wheel 302g - torsional spring buckle A

[0068] 302h - shaft sleeve B 302i - torsional spring buckle B 302j - torsional spring

[0069] 302k - shaft sleeve C 302l - top spring B 302m - lock head

[0070] 302n - lock seat cover 401 - radial support rod connecting seat 402 - radial support locking mechanism

[0071] 403 - bearing seat 404 - damping disc 402a - disc-shaped shell

[0072] 402b - support 402c - circular connecting part 402d - locking matching protrusion 402e - radial support lock head 402a1 - radial support locking channel DETAILED DESCRIPTION

[0073] The application will be further described in conjunction with the accompanying drawings.

[0074] The application is a high folding and unfolding ratio rigid ring-shaped reflector antenna folding and unfolding mechanism, which comprises a ring-shaped scissor mechanism 1, a central folding and unfolding mechanism 2 and a radial support rod 3. Figure 1 , Figure 2 The fully folded state and the fully unfolded state are shown.

[0075] The ring-shaped scissor mechanism 1 is composed of a plurality of scissor units 101 and a swing limiting mechanism 102. The scissor units 101 are divided into six types, including a middle scissor unit 101a connected with the radial support rod 3, a left scissor unit 101b connected with the radial support rod 3, a right scissor unit 101c connected with the radial support rod 3, a common scissor unit 101d, a scissor unit with a lock seat 101e and a scissor unit with a lock tongue 101f.

[0076] Among them, the middle scissor unit 101a, the left scissor unit 101b, the right scissor unit 101c and the common scissor unit 101d have the same structure, which is the basic structure of the scissor unit, including a reflector panel 1a and a C-shaped rod 1b, as shown in Figure 3 , Figure 4 .

[0077] The reflector panel 1a is a fan-shaped structure, the inner and outer sides of the reflector panel 1a are metal panels, and the metal honeycomb sandwich is between the two. The overall reflector panel 1a has a certain arc perpendicular to the axis direction, so that when each scissor unit 101 is unfolded, the inner arc surfaces of each reflector panel 1a form a continuous annular surface. There are five metal embedded parts around the reflector panel 1a, which are metal embedded part m1 at the top edge left corner position, metal embedded part M2 at the top edge center position, metal embedded part M3 at the bottom edge left corner position, metal embedded part M4 at the bottom edge center position and metal embedded part M5 at the bottom edge right corner position. Each of the above metal embedded parts has an outward protruding shaft, and the axes of the five protruding shafts are coplanar. The protruding shafts of the metal embedded part M1 and the metal embedded part M3 are arranged along the left side edge of the reflector panel 1a, and the two are coaxial; the protruding shafts of the metal embedded part M2 and the metal embedded part M4 are coaxial; the protruding shaft axis of the metal embedded part M5 is parallel to the left side edge of the reflector panel 1a.

[0078] The C-shaped rod 1b is composed of four carbon fiber rods, five columnar metal bosses and ten bearings. Let the four carbon fiber rods be rods L1-L4 respectively; and let the five metal bosses be B1-B5 respectively; wherein rod L1 is an arc-shaped rod arranged along the outer arc of the reflecting panel, one end of which is fixed to the side of metal boss B1; the other end of rod L1 is fixed to the side of metal boss B2; rods L3 and L4 are arc-shaped rods arranged along the inner arc of the reflecting panel, both of which are equal in length, one end of rod L3 is fixed to the side of metal boss B3, and the other end is fixed to the side of metal boss B4; one end of rod L4 is fixed to the side of metal boss B4, and the other end is fixed to the side of metal boss B5. Rod L2 is a straight rod, which is arranged perpendicularly to rods L1 and L3, and both ends of which are fixed to the extended ends designed on the sides of metal bosses B2 and B3 respectively; so that the four connecting rods can jointly form a sector-shaped structure.

[0079] The C-shaped rod 1b of the above structure surrounds the reflecting panel 1a on the right side, the metal bosses B1 and B4 are coaxially bored, and the metal bosses B2 and B3 are coaxially bored. Among them, the metal boss B1 is coaxially sleeved with the protruding shaft of the metal embedded part M2 through the bearings installed on both ends of the bore to form a rotating pair; the metal boss B4 is coaxially sleeved with the protruding shaft of the metal embedded part M4 through the bearings installed on both ends of the bore to form a rotating pair.

[0080] The structure of the scissor unit 101e with lock seat is similar to the basic structure of the aforementioned scissor unit, the difference lies in that the scissor unit 101e with lock seat has four metal embedded parts, and the C-shaped rod 1b is designed with a lock seat, and the connection relationship between the C-shaped rod 1b and the metal embedded parts changes. Among them, the metal embedded part part does not have a metal embedded part M5; the metal bosses B2 and B3 in the C-shaped rod 1b are replaced by lock seats 1c, that is, the C-shaped rod 1b has three metal bosses and two lock seats 1c, as shown in Figure 5 .

[0081] The structure of the scissor unit 101f with lock tongue is also similar to the aforementioned ordinary ring-shaped scissor unit, the difference lies in that the scissor unit 101f with lock tongue has three metal embedded parts, and the C-shaped rod 1b is increased with a rod L5, and a lock head 1d is additionally provided. Among them, the metal embedded part part does not have metal embedded parts M1 and M3; rod L5 is an arc-shaped rod arranged along the outer arc of the reflecting panel, the end of which is connected to the side of metal boss B1. The lock head 1d is two, which is installed on the mounting surface designed at the end of rod L5 and rod L4, as shown in Figure 6 .

[0082] The two lock tongues 1d in the aforementioned scissor unit 101f with lock tongue are respectively matched and docked with the two lock seats 1c in the scissor unit 101e with lock seat to achieve locking between the two ends when the ring-shaped scissor mechanism 1 is fully unfolded. As shown in Figure 7As shown, the bottom of the lock seat 1c is a connecting body 1c1 for connecting with the C-shaped rod 1b; the upper part of the lock seat 1c is a horn structure 1c2, and the opening is directed to the right side of the reflecting panel 1a. The end of the horn structure 1c2 has a coaxial designed locking channel A1c3, and also has a locking channel B1c4 perpendicular to the axis of the horn structure 1c2. The inside of the locking channel B1c4 is coaxially provided with a lock head 1c5, and the head of the lock head 1c5 is designed as a circular truncated cone structure, which can be extended from the bottom of the locking channel B1c4 to the locking channel A; and the lock head 1c5 is matched with the sliding groove opened in the inside of the locking channel B1c4 through the convex part designed at the circumferential opposite position, so that the lock head 1c5 will not be deflected during the movement along the locking channel B1c4; at the same time, through the cooperation of the shoulder and the bottom end of the sliding groove, the displacement of the lock head 1c5 to the direction of the locking channel A1c3 is limited. The lock head 1c5 is sleeved with a spring 1c6, and the two ends of the spring 1c6 are in contact with the shoulder on the lock head 1c5 and the limiting plate 1c7 respectively; the limiting plate 1c7 is fixedly installed on the outer wall at the end of the horn structure 1c2; and the end of the lock head 1c5 penetrates through the limiting plate 1c7.

[0083] As shown in Figure 8 , the lock tongue 1d is a columnar structure, and the end is connected with the C-shaped rod 1b; the end of the lock tongue 1d is a semicircular structure; and the circumferential outer wall of the front end of the lock tongue 1d is designed with an annular groove 1d1, and the cross section of the annular groove 1d1 matches the longitudinal section of the head of the circular truncated cone structure of the lock head 1c5.

[0084] Therefore, when the lock tongue 1d is locked with the lock seat 1c, the lock tongue 1d is guided to penetrate into the locking channel A1c3 through the inner wall of the horn, and in the process, the front end of the lock tongue 1d is in contact with the lock head 1c5, the spring 1c6 is compressed, and the lock head 1c5 is retracted into the locking channel B1c4; when the front end of the lock tongue 1d passes through the locking channel B1c4 and the lock tongue 1d reaches the position of the locking channel B1c4, the spring 1c6 rebounds, and the lock head 1d is inserted into the locking channel B1c4, thereby realizing the locking between the lock seat scissors unit 101e and the lock tongue scissors unit 101f, as shown in Figure 9 .

[0085] The mounting positions of the horn structures 1c2 on the connecting bodies 1c1 of the above two lock seats 1c and the specific positions of the two lock heads 1c on the end mounting surfaces of the rods L5 and L4 need to be reasonably designed, and it is not easy to be too close to the reflecting panel 1a to prevent the horn structure 1c2 of the lock seat 1c from interfering with the emission of the reflecting panel 1a in the lock tongue scissors unit 101f during the docking.

[0086] The above-mentioned various scissor units are connected to each other to form an overall annular scissor mechanism; wherein the left and right ends of the annular scissor units are respectively a scissor unit with a lock seat 101e and a scissor unit with a lock tongue 101f; the middle is a middle scissor unit 101a; the left and right adjacent scissor units are respectively a left scissor unit 101b and a right scissor unit 101c; and the left scissor unit 101b and the scissor unit with a lock seat 101e, and the right scissor unit 101b and the scissor unit with a lock tongue 101f are all connected by a plurality of ordinary scissor units 101d.

[0087] The connection mode of each adjacent scissor unit is as follows:

[0088] As shown in Figure 10 , the protruding rods of the metal embedded parts M1 and M3 in the right scissor unit are respectively inserted into the holes on the metal bosses B2 and B3 in the left adjacent scissor unit, and a rotating pair is formed by the bearing connection in the hole; the metal boss B5 in the right scissor unit is matched with the hole on the metal embedded part M5 in the left adjacent scissor unit, and a rotating pair is formed by the bearing connection in the hole. Finally, the annular scissor mechanism 1 is obtained.

[0089] The above-mentioned annular scissor mechanism can be gradually folded by the rotation between each rotating pair, so that the reflecting panels 1a of each scissor unit are stacked and arranged in a storage state, as shown in Figure 1 . By reversing the rotation of each rotating pair, the reflecting panels 1a of each scissor unit are gradually unfolded, until the two lock tongues 1d in the scissor unit with a lock tongue 101f are respectively inserted into the scissor unit 101d with a lock seat 1c to be locked, at this time the annular scissor mechanism is completely unfolded in a ring shape, as shown in Figure 2 ; by the cooperation of the lock tongue 1d and the lock seat 1c, the annular scissor mechanism is locked when it is completely unfolded.

[0090] The swing limiting mechanism 102 is used to realize that the annular scissor mechanism cannot rotate arbitrarily around the axis of the radial support rod 3 during unfolding. The swing limiting mechanism 102 is installed at the middle scissor unit, as shown in Figure 3 , Figure 10 , which includes a joint 102a, a carbon fiber rod A 102b, a carbon fiber rod B 102c, a connecting joint 102d and a limiting shaft 102e, as shown in Figure 10 .

[0091] The top end of the carbon fiber rod A102b is fixedly connected with a columnar joint 102a, and the top end is connected to the side wall of the columnar joint 102a. The coaxial hole on the top end of the columnar joint 102a of the carbon fiber rod A102b is sleeved on the protruding shaft of the metal embedded part M3 in the middle scissor unit, forming a rotating pair; the coaxial hole on the top end of the columnar joint 102a of the carbon fiber rod B102c is sleeved on the protruding shaft of the metal embedded part M3 in the right scissor unit, forming a rotating pair. The bottom ends of the carbon fiber rod A102b and the carbon fiber rod B102c are jointly sleeved on the limiting shaft 102e.

[0092] The connecting joint 102f includes an upper joint 102d1, a lower joint 102d2 and a sliding groove connecting rod 102d3; wherein the upper joint 102d1 and the lower joint 102d2 are both semi-circular cross-section connecting pieces, which are fixed between the two joints by cooperating with screws through the lugs designed at the corresponding positions of the side walls of the two joints after being buckled up and down, forming an integral cylindrical joint, which is sleeved on the protruding shaft end of the metal boss B4 in the middle scissor unit 101a, and a bearing is installed therebetween; so that the metal boss B4 can rotate arbitrarily around the connecting joint 102f. The sliding groove connecting rod 102d3 and the lower joint 102d2 are designed as an integral structure, the top end is connected with the side wall of the lower joint 102d2, and a limiting groove is formed along the length direction of the sliding groove connecting rod 102d3. The end of the aforementioned limiting shaft 102e is connected with the limiting groove in a sliding fit, and the limiting shaft 102e can arbitrarily slide in the limiting groove of the sliding groove connecting rod 102f3.

[0093] The carbon fiber rod A102b, the carbon fiber rod B102c and the sliding groove connecting rod 102d3 are all arc-shaped rods, and a spherical four-bar mechanism is formed between the three and the connected scissor units, and the limiting shaft 102e of the swing limiting mechanism 102 is located in the limiting groove of the connecting joint 102d with the limiting groove, so that the two rotating shafts always lie in the symmetry plane of the connecting joint 102f with the limiting groove, thereby limiting the swing of the annular scissor mechanism 101 relative to the radial support rod 3. Without the swing limiting mechanism, the annular scissor mechanism 1 can rotate arbitrarily around the radial support rod axis during the unfolding process, and cannot be kept horizontal, forming a shape as shown in Figure 11 .

[0094] The center unfolding and folding mechanism 2 includes an inner cylinder 201, an outer cylinder 202, a locking assembly, a guide wheel, a wire wheel and a driving assembly, as shown in Figure 12 .

[0095] The top end and the bottom end of the inner cylinder 201 are fixedly installed with an inner cylinder upper flange 201a and an inner cylinder lower flange 201b respectively; a guide groove 201c is designed on the outer wall of the inner cylinder 201 along the axial direction of the inner cylinder 201. The bottom surface of the inner cylinder lower flange 201a is fixedly installed with a locking assembly, an inner cylinder guide wheel and an inner cylinder wire wheel, as shown in Figure 13The locking assembly is fixedly installed on the top surface of the lower flange 201b of the inner cylinder, is circumferentially and uniformly distributed with three locking assemblies, and is respectively arranged at the through opening of the bottom of the inner cylinder 201. The inner cylinder guide wheels are four guide wheels installed on the bottom surface of the lower flange 201b of the inner cylinder, every two inner cylinder guide wheels are a group, are oppositely arranged, and the center connecting line intersects the inner cylinder 201. The inner cylinder wire wheels are two wire wheels, are oppositely arranged, and are coaxial.

[0096] The locking assembly includes a pulley 203a, a pulley shaft 203b, a lock head 203c, a lock seat 203d, a lock seat cover 203e and a spring 203f, as shown in Figure 14 、 Figure 15 The pulley shaft 203b passes through the center hole of the pulley 203a, so that the pulley 203a can rotate around the pulley shaft 203b. The pulley shaft 203b is fixedly installed on both sides of the groove designed at the front end of the lock head, so that part of the pulley 203a is located in the groove. The lock head 203c is located in the lock seat 203d, and the front end of the pulley 203 is out of the lock seat 203c. The lock head 203c has a shoulder on both sides of the end, which cooperates with the front wall surface of the lock seat 203d to limit the outward movement of the lock head 203. At the same time, the lock seat 203d is designed with a groove on the shoulder at the end, which is connected with the slide groove on the opposite side wall of the lock head 203c. Further, the end surface of the lock head 203 is designed with a spring shaft, and the spring 203f is sleeved on the spring shaft and is fixedly installed at the end of the lock head 203 and the lock seat cover 203e at the end of the lock seat 203d. Thus, when the lock head 203c is stressed, the spring 203f is compressed, and the lock head 203c is pressed into the lock seat 203d.

[0097] The top end of the outer cylinder 202 is coaxially and fixedly installed with an outer cylinder upper flange 202a; the inner wall of the top of the outer cylinder 202 is installed with a guide key at the corresponding position of the inner cylinder guide groove 201c; further, the side wall of the upper part of the outer cylinder 202 is circumferentially provided with three openings, and the circumferential positions of the three openings correspond to the positions of the locking assemblies; the three openings are fixedly embedded with metal plates 202b with through holes. Further, the bottom end of the outer cylinder 202 is sleeved on the outer cylinder base 202b, and is positioned by the annular shoulder at the bottom edge of the outer cylinder base 202b.

[0098] The top surface of the outer cylinder upper flange 202a is fixedly installed with a limiting block, an outer cylinder guide wheel and an outer cylinder wire wheel, as shown in Figure 16 The limiting block is three, is circumferentially and uniformly distributed, is used for cooperating with the inner cylinder upper flange 201a, and ensures that the inner cylinder 201 will not be excessively folded. The outer cylinder guide wheel is four, and the outer cylinder wire wheel is two; wherein the arrangement position of the four outer cylinder guide wheels on the outer cylinder upper flange 202a corresponds to the position of the four inner cylinder guide wheels and has the same installation mode; the two outer cylinder wire wheels are oppositely arranged, and the axis is perpendicular to the axis of the inner cylinder wire wheel.

[0099] The inner cylinder 201 is coaxially sleeved with the outer cylinder 202, the guide keys on the outer cylinder 202 are respectively embedded into the guide grooves on the outer wall of the inner cylinder 201, and the circumferential rotation between the inner cylinder 201 and the outer cylinder 202 is limited. Figure 17 As shown in the figure, the four guide wheels on the bottom surface of the lower flange 201b of the inner cylinder are in contact with the inner wall of the outer cylinder, and the four guide wheels on the top surface of the upper flange 202a of the outer cylinder are in contact with the outer wall of the inner cylinder, so that the sliding fit sleeve connection between the inner cylinder 201 and the outer cylinder 202 is realized. At the same time, the lock heads 203c of the three locking assemblies on the lower flange 201b of the inner cylinder are kept in contact with the inner wall of the outer cylinder 202 under the action of the spring. When the inner cylinder 201 and the outer cylinder 202 are unfolded, the pulleys 203a of the three locking assemblies roll along the inner wall of the outer cylinder until the outer conical surface designed on the bottom outer wall of the inner cylinder 201 cooperates with the inner conical surface designed on the top of the outer cylinder 202, and the lower flange 201b of the inner cylinder cooperates with the shoulder designed on the inner wall of the upper part of the inner cylinder. At this time, the pulleys 203a of the three locking assemblies reach the through hole position of the three metal plates on the upper part of the outer cylinder 202, the lock heads 203c are popped out from the through hole under the action of the spring force of the spring 203f, and the locking after the complete unfolding of the inner cylinder 201 and the outer cylinder 202 is realized.

[0100] The driving assembly is used to realize the unfolding of the central unfolding mechanism and is installed inside the outer cylinder base 202b, as shown in the figure. Figure 18 The driving assembly includes a transmission gear set 204a, a winding drum 204b, a driving motor 204c and a speed reducer 204d, a base wire wheel 204e and a driving rope, as shown in the figure. Figure 19 Among them, the winding drum 204b is two, the axis is perpendicular to the wire wheel on the inner and outer cylinders, is commonly fixed on the winding drum shaft 204e, and the two winding drums 204c are separated by a partition plate 204f. The winding drum shaft 204e is also provided with a limiting baffle 204g at both ends, which cooperates with the partition plate 204f to prevent the wire rope on the two winding drums 204b from coming out of the winding drum 204b. The winding drum shaft 204e is respectively installed on the bracket A 204h and the bracket B 204i inside the outer cylinder base 202b through bearings. The output shaft of the driving motor 204c is connected with the speed reducer 204d, the speed reducer 204d is installed in the outer cylinder base 202b through the bracket C 204j, and the output shaft of the speed reducer 204d is installed on the aforementioned bracket B 204i through a bearing. The transmission gear set 204a includes a speed reduction large gear and a speed reduction small gear, which are respectively fixed on the output shaft of the speed reducer 204d and the winding drum shaft 204e, and the two gears are meshed with each other. Thus, by driving the driving motor 204c, the transmission gear set drives the two winding drums 204b to rotate synchronously.

[0101] The two winding drums 204b are used to wind the driving rope, as shown in the figure. Figure 20As shown, one end of the driving rope is wound on one of the winding drums 204b, then turns 90° along the horizontal base pulley 202b1 designed on the top edge of the base 202b of the same side outer cylinder, further vertically upwards along the top pulley of the same side outer cylinder 202, turns 180° vertically downwards, further turns 90° along the bottom pulley of the same side inner cylinder 201, then turns 90° horizontally along the bottom pulley of the other side inner cylinder 201, further turns 90° upwards along the top pulley of the other side outer cylinder 202, turns 180°, and finally turns 90° vertically downwards along the base pulley 202b1 designed on the top edge of the base 202b of the other side outer cylinder, and is wound on the other winding drum 204b. Thus, the driving motor 204c drives the transmission gear set 204a to drive the two winding drums 204b to wind the driving rope, and further drives the inner cylinder 201 to move upwards and extend out of the outer cylinder 202.

[0102] The annular scissors mechanism 1 and the central unfolding and folding mechanism 2 are connected through the radial support rods 3. The radial support rods 3 include three support rods 301 and two radial support joints 302, as shown in the figure. Figure 22 As shown, the two radial support joints 302 are the same in structure, including a lock seat joint 302a, a joint shaft 302b, a lock tongue joint 302c, a shaft sleeve A 302d, a top spring A 302e, a joint synchronous wheel 302f, a torsion spring buckle 302g, a shaft sleeve B 302h, a torsion spring 302i, a torsion spring buckle B 302j, a shaft sleeve B 302k, and a top spring B 302l, as shown in the figure. Figure 21The locking seat joint 302a and the locking tongue joint 302c are two spherical structures coaxially connected by the joint shaft 302b. The A end of the joint shaft 302b is axially connected with the locking tongue joint 302c and the locking seat joint 302a, and the B end is designed with a D-shaped section which is matched with a D-shaped hole on the locking tongue joint 302c to be sleeved. The B end is axially connected with the locking seat joint 302a. The two ends of the joint shaft 302b are limited by the stop ring through the mounting shaft. Thus, the locking tongue joint 302c cannot rotate around the joint shaft 302b, while the locking seat joint 302a can rotate around the joint shaft 302b. Meanwhile, the rotation angle of the locking seat joint 302a can be limited by the contact between the two spherical structures on the opposite sides, so that the locking seat joint 302a can only rotate 90° around the joint shaft 302b. The joint shaft 302b is sequentially sleeved with the shaft sleeve A 302h, the top spring A 302e, the joint synchronous wheel 302f, the top spring 302l, the shaft sleeve B 302h, the torsion spring 302j and the shaft sleeve C 302k. The shaft sleeve A 302h, the shaft sleeve B 302h and the top spring 302l are used to stabilize the joint synchronous wheel 302f in the middle position of the radial support joint 302. Meanwhile, the torsion spring clamp A 302g and the torsion spring buckle B 302i are designed on the inner walls of the locking seat joint 302a and the locking tongue joint 302c respectively. The joint synchronous wheel 302f is keyed connected with the joint shaft 302b, and the other parts are pressed by the top spring B 302l. The two ends of the torsion spring 302j are respectively clamped into the torsion spring clamp A 302g and the torsion spring buckle B 302i to be fixed.

[0103] The joint shaft 312 of the two radial support joints 302 in the above structure is arranged in parallel and connected with the three support rods 301. The lengths of the three support rods 301 are different, and the length of the middle support rod > the length of the front end support rod > the length of the end support rod. The end of the end support rod is fixedly connected with the radial support rod connecting assembly in the central unfolding and folding mechanism. The front end of the end support rod is fixedly connected with the insertion slot on the outer wall of the locking tongue joint 313 in a radial support joint A. The end of the middle support rod is fixedly connected with the insertion slot on the outer wall of the locking seat joint 311 in a radial support joint A. The front end of the middle support rod is fixedly connected with the insertion slot on the outer wall of the locking tongue joint 313 in a radial support joint B. The end of the front end support rod is fixedly connected with the insertion slot on the outer wall of the locking seat joint 311 in a radial support joint B. The front end of the front end support rod is fixedly connected with the connecting joint 102f in the swing limiting mechanism 102.

[0104] The radial support rod 3 in the above structure is affected by the torsion spring in the two radial support units, so that the radial support rod joint 302 can be automatically unfolded by the torque of the torsion spring 302j. When the radial support rod 3 is in the folded state, the end support rod and the front end support rod are in the horizontal state, and the middle support rod is in the vertical state, as shown in Figure 1The radial support rod joint A rotates 90° during the unfolding process, causing the middle support rod to rotate downward from the vertical state to the coaxial state with the end support rod. At the same time, the radial support rod joint B 304 rotates 90°, causing the front end support rod to rotate upward from the vertical state with the middle support rod to the coaxial state with the middle support rod. At this time, the radial support rod 3 is fully unfolded, and the three support rods are coaxial, as shown in Figure 2

[0105] The joint synchronization wheel 302f of the two radial support joints 302 is wound with a synchronization rope, which is placed inside the middle support rod and has two ends passing through the joint synchronization wheels of the two radial support joints 302 at the two ends of the middle support rod, allowing the two radial support joints 302 to rotate synchronously.

[0106] During the unfolding process of the radial support rod 3, when the two radial support rod joints rotate 90° synchronously, the locking mechanism designed on the lock seat joint 302a and the lock tongue joint 302c is used to lock them. The locking mechanism includes the joint lock head 302m designed on the lock tongue joint 302a and the locking groove 302n designed on the lock seat joint 302a, as shown in Figure 22 The joint lock head 302m is installed in the locking port on the end wall of the lock tongue joint 302c, and the installation method between the joint lock head 302m and the locking port is the same as that of the lock head 203c in the aforementioned locking assembly. Thus, when under pressure, the joint lock head 302m can retract into the locking port. The locking groove 302n is designed on the outer wall surface of the lock seat joint 302a near the end opposite to the joint lock head 302m. During the locking process of the lock tongue joint 302c and the lock seat joint 302a, the side inclined surface of the joint lock head 302o contacts the end of the lock seat joint 302a, further retracts into the locking port under pressure, and then reaches the position of the locking groove 302n, pops out and inserts into the locking groove 302n under the action of the spring elastic force, achieving the locking between the lock tongue joint 302c and the lock seat joint 302a, as shown in Figure 23

[0107] The aforementioned radial support rod connecting assembly 4 used to connect the radial support rod 3 and the central unfolding and folding mechanism 2 is installed on the top surface of the outer cylinder base 202b, including the radial support rod connecting seat 401, the radial support locking mechanism 402, the bearing seat 403, and the damping disc 404, as shown in Figure 24 The radial support rod connecting seat 401 is a cylindrical structure, and the inside is used to insert and fix the radial support rod 3. The rotating shafts are designed on the opposite positions of the side of the radial support connecting seat 401, and the rotating shafts are connected through bearings with the two bearing seats 403 installed on the upper surface of the outer cylinder base 202b. One radial support locking mechanism 402 is arranged on the outer side of each bearing seat.

[0108] ​​The radial support locking mechanism 402 has a disc-shaped housing 402a fixed to the upper surface of the outer cylinder base 202b by a support 402b. A circular groove is formed in the center of the disc-shaped housing 402a, and a sector-shaped groove is formed in the inner arc surface of the circular groove. Radial support locking blocks are arranged in the circular groove and the sector-shaped groove. The radial support locking blocks have a circular connecting portion 402c and a locking matching protrusion 402d connected to the connecting portion. The connecting portion 402c and the locking matching protrusion 402d are arranged in the circular groove and the sector-shaped groove, respectively. The connecting portions 402c of the two radial support locking blocks are fixed to the two side shaft ends of the radial support rod connecting seat 401. Thus, the radial support locking blocks and the radial support rod connecting seat 401 can rotate around the shaft axis. A radial support locking channel 402a1 is formed in the side wall of the disc-shaped housing 402a. The radial support locking channel 402a1 is connected to the sector-shaped groove of the disc-shaped housing 402a, and a radial support locking head 402e is arranged in the radial support locking channel 402a1. The radial support rod 3 can drive the radial support locking blocks to rotate. The sector-shaped groove and the locking matching protrusion 402d can limit the rotation. When the locking matching protrusion 402d is rotated to be circumferentially offset from the radial support locking head 402e, the radial support locking head 402e can be pulled out of the radial support locking channel 402a1 and inserted into the sector-shaped groove. At this time, the radial support locking head 402e is positioned between the sector-shaped groove and the locking matching protrusion 402d. Thus, the radial support locking blocks are locked, and the radial support rod 3 is locked.

[0109] In the high folding and unfolding ratio rigid annular reflector antenna folding and unfolding mechanism, the connection between the center folding and unfolding mechanism 2 and the annular scissor mechanism 1 is achieved by a slide rail rope mechanism. The slide rail rope mechanism includes two annular slide rails and 16 ropes. The two annular slide rails are fixed to the top of the inner cylinder 201 and the bottom of the outer cylinder 202, respectively. The annular slide rail at the top of the inner cylinder 201 is fixedly connected to the upper flange 201 of the inner cylinder. The annular slide rail at the bottom of the outer cylinder 202 is supported by six slide rail supports uniformly distributed in the circumferential direction and fixed by bolts. The bottom ends of the six slide rail supports are fixed to the shoulder of the outer cylinder base 202b, and the top ends are fixed to the annular slide rail by bolts. The annular slide rail has upper and lower slide rails. The upper and lower slide rails are fixed by screws and have a gap therebetween. The slide block connection end is located outside the two slide rails, and the sliding end is located in the sliding groove formed inside the fixed two slide rails.

[0110] The inner cylinder 201 and the outer cylinder 202 each have m slide blocks in the annular slide rail. The m slide blocks of the annular slide rail at the top of the inner cylinder 201 are fixedly connected to the sliding ends of the m ropes, and the other ends are fixed to the ring nut installed on the protruding shaft of the metal insert M5 of the m scissor units uniformly spaced in the circumferential direction. The number of m is determined according to the number of scissor units. The number of intervals should be as large as possible to uniformly distribute the m ropes in the circumferential direction when the annular scissor mechanism is unfolded.

[0111] The m sliders of the annular slide rail at the lower part of the outer cylinder 202 are respectively connected and fixed to the sliding ends of the other m ropes, and the other ends are respectively fixed to the eye nuts installed on the protruding shafts of the metal embedded parts M3 in the m scissor units adjacent to the aforementioned m inspection units.

[0112] To ensure optimal opening, the present invention features a total of 24 scissor units. Eight sliders are designed within the annular guide rail at the bottom of the outer cylinder 202. Two adjacent ropes are secured to eyenuts attached to the extended shafts of the metal embedded component M5 in the adjacent scissor unit to the left of the left scissor unit 101b and the right scissor unit 101c. The remaining ropes are arranged circumferentially, connecting the scissor units three spaces apart. Eight sliders are designed within the annular guide rail at the top of the inner cylinder 201. Two adjacent ropes are secured to eyenuts attached to the extended shafts of the metal embedded component M5 in the adjacent inspection unit to the right of the left scissor unit 101b and the right scissor unit 101c. The remaining ropes are arranged circumferentially, connecting the scissor units three spaces apart.

[0113] In summary, the folding and unfolding mechanism of the high folding and unfolding ratio annular reflector antenna of the present invention is formed. In the folded state, Figure 1 As shown, the scissor units are stacked and collapsed, with the longitudinal support rods in a Z-shaped retraction position, and the inner cylinder 201 positioned within the outer cylinder 202. This maintains the overall folding and unfolding mechanism in this retracted state. In this state, the intermediate support rods of the radial supports 3 are positioned within a compression and release mechanism mounted on the sidewall of the outer cylinder 202, maintaining the overall retracted state of the folding and unfolding mechanism. The compression and release mechanism is a set of SMA tube actuators mounted within a sleeve on the sidewall of the outer cylinder 202. The drive end is connected to a collar by a notched bolt, and the collar is sleeved onto the intermediate support rods.

[0114] The specific process for deploying the high-aspect-ratio annular reflector antenna from a folded state is as follows: First, the notched bolt at the driving end of the SMA tube actuator is controlled to crack, thereby unlocking the radial support rod 3, which is automatically deployed to a horizontal straight rod state under the action of the torsion spring and locked. Subsequently, the motor in the drive assembly is controlled to drive the inner cylinder 201 to extend from the outer cylinder 202. During the entire extension process, the upper and lower annular slide rails 4 move circumferentially along the annular slide rails 4, and the drive ropes 5 connected to each slider pull the annular scissors mechanism 1 to deploy. During the deployment of the annular scissors mechanism, when the inner cylinder 201 and the outer cylinder 202 are fully deployed, the central deployment mechanism 2 applies sufficient pre-tightening force to the rope, causing the scissors mechanism 101f with the locking tongue to lock with the scissors mechanism with the locking seat, at which point the entire deployment process is complete.

Claims

1. A high-folding-expansion ratio annular reflector antenna folding and unfolding mechanism, characterized by: It includes a ring scissor mechanism, a central expansion and retraction mechanism, a radial support rod and a slide rail rope mechanism; The annular scissor mechanism is composed of a plurality of scissor units connected to each other; the scissor units are divided into six categories, including a middle scissor unit, a left scissor unit, a right scissor unit, a common scissor unit, a scissor unit with a lock seat, and a scissor unit with a lock tongue; The above-mentioned middle scissor unit, left scissor unit, right scissor unit, and ordinary scissor unit have the same structure, including a reflective panel and a C-shaped rod; wherein the reflective panel is a fan-shaped structure, and five metal embedded parts are embedded in the circumference, namely the metal embedded part M1 at the left angle position of the top edge, the metal embedded part M2 at the center position of the top edge, the metal embedded part M3 at the left angle position of the bottom edge, the metal embedded part M4 at the center position of the bottom edge, and the metal embedded part M5 at the right angle position of the bottom edge; The C-shaped rod is composed of four carbon fiber rods and five columnar metal bosses; the four carbon fiber rods are rods L1 to L4; and the five metal bosses are B1 to B5; wherein rod L1 is arranged along the side of the reflective panel, and one end is fixed to the side of the metal boss B1; the other end of rod L1 is fixed to the side of the metal boss B2; rod L3 and rod L4 are arc-shaped rods arranged along the inner arc of the reflective panel, one end of rod L3 is fixed to the side of the metal boss B3, and the other end is fixed to the side of the metal boss B4; one end of rod L4 is fixed to the side of the metal boss B4, and the other end is fixed to the side of the metal boss B5; rod L2 is arranged perpendicular to rod L1 and rod L3, and its two ends are fixed to the sides of metal boss B2 and metal boss B3 respectively; in the C-shaped rod of the above structure, the metal boss B1 is sleeved with the protruding shaft of the metal embedded part M2 to form a revolute pair; the metal boss B4 is coaxially sleeved with the protruding shaft of the metal embedded part M4 to form a revolute pair; The structure of the scissors fork unit with a lock seat differs from that of the middle scissors fork unit, the left scissors fork unit, the right scissors fork unit, and the ordinary scissors fork unit in that: the scissors fork unit with a lock seat has four metal embedded parts, and a lock seat is designed on the C-shaped rod. At the same time, the connection relationship between the C-shaped rod and the metal embedded parts is changed; the metal embedded part does not have the metal embedded part M5; the metal bosses B2 and B3 in the C-shaped rod are replaced by the lock seat; The structure of the scissors-fork unit with a locking tongue differs from the middle scissors-fork unit, the left scissors-fork unit, the right scissors-fork unit, and the ordinary scissors-fork unit in that: the scissors-fork unit with a locking tongue has three metal embedded parts, and a rod L5 is added to the C-shaped rod, and a locking head is added; the metal embedded part does not have the metal embedded parts M1 and M3; the rod L5 is an arc-shaped rod arranged along the outer arc of the reflective panel, and the end is connected to the side of the metal boss B1; there are two locking heads, installed at the ends of the rod L5 and the rod L4, for cooperating with the lock seat to achieve locking between the scissors-fork unit with the lock seat and the scissors-fork unit with a locking tongue; The scissor units of the above structure are interconnected to form an integral ring-shaped scissor mechanism; the left and right ends of the ring-shaped scissor mechanism are respectively a scissor unit with a lock seat and a scissor unit with a lock tongue; the middle is an intermediate scissor unit; the scissor units adjacent to the intermediate scissor unit on the left and right are respectively a left scissor unit and a right scissor unit; between the left scissor unit and the scissor unit with a lock seat, and between the right scissor unit and the scissor unit with a lock tongue are multiple interconnected ordinary scissor units; the connection method of each adjacent scissor unit is as follows: The extended rods of the metal embedded parts M1 and M3 in the scissor unit on the right are respectively plugged into the openings on the metal bosses B2 and B3 in the adjacent scissor unit on the left, and are connected by bearings in the openings to form a revolving pair; the metal boss B5 in the scissor unit on the right is matched with the opening on the metal embedded part M5 in the adjacent scissor unit on the left, and are connected by bearings in the openings to form a revolving pair; The annular scissor mechanism can be gradually retracted by the rotation of the respective rotating pairs, so that the reflective panels of the respective scissor units are in a stacked and stored state; and the reflective panels of the respective scissor units are gradually unfolded by the reverse rotation of the respective rotating pairs until the two locking tongues of the scissor unit with locking tongues are respectively inserted into the scissor unit with locking seat and locked, at which point the annular scissor mechanism is fully unfolded into an annular shape. The central extension and retraction mechanism is a double-layer cylindrical structure. When the inner cylinder is extended to the limit position, the locking assembly realizes the locking between the inner cylinder and the outer cylinder. The central extension and retraction mechanism is connected to the annular scissor mechanism through radial support rods. The radial support rods include three support rods and two radial support joints. The three support rods are connected by radial support joints. The two radial support joints realize 90° rotation between two adjacent support rods. The end of the entire support rod is fixed to the bottom of the outer cylinder of the central extension and retraction mechanism; the front end is fixed to the extended shaft end of the metal boss B4 in the middle scissor unit; the radial support rod is supported by two radial support joints. The torsion spring in the radial support rod enables the radial support rod joint to automatically expand under the torque of the torsion spring; when the radial support rod is in the retracted state, the end support rod and the front support rod are in a horizontal state, and the middle support rod is in a vertical state; during the expansion process, one radial support rod joint is rotated 90° and locked, so that the middle support rod is rotated downward from the vertical state to the coaxial state with the end support rod; at the same time, the other radial support rod joint is rotated 90° and locked, so that the front support rod is rotated upward from the vertical state with the middle support rod to the coaxial state with the middle support rod. At this time, the radial support rod is fully expanded and the three support rods are coaxial; The slide rail and rope mechanism includes two annular slide rails and multiple ropes; the two annular slide rails are respectively sleeved and fixed on the top of the inner cylinder and the bottom of the outer cylinder; the annular slide rails at the top of the inner cylinder and the bottom of the outer cylinder each have m sliders, wherein the m sliders of the annular slide rail at the top of the inner cylinder are respectively connected and fixed to the sliding ends of m ropes, and the other ends of the ropes are respectively fixed to the eye nuts installed on the extended shafts of the metal embedded parts M5 in the m scissor lift units spaced evenly in the circumferential direction; wherein the number m is specifically determined according to the number of scissor lift units; the number of intervals should be such that the m ropes are evenly arranged in the circumferential direction after the annular scissor lift mechanism is unfolded; The m sliders of the annular slide rail at the bottom of the outer cylinder are respectively connected and fixed with the sliding ends of another m ropes, and the other ends of the ropes are respectively fixed with the eye nuts installed on the protruding shafts of the metal embedded parts M3 in the m scissor lift units adjacent to the aforementioned m scissor lift units.

2. The high-folding-expansion ratio annular reflector antenna folding and unfolding mechanism according to claim 1, characterized in that: The inner and outer sides of the reflective panel are metal panels, and there is a metal honeycomb sandwich between them.

3. The high-folding-expansion ratio annular reflector antenna folding and unfolding mechanism according to claim 1, characterized in that: The lock seat is designed with a lock tongue insertion channel and a retractable lock head arranged perpendicular to the lock tongue insertion channel; after the lock tongue penetrates, the lock head cooperates with the annular groove on the lock tongue side wall to achieve locking.

4. The high-folding-expansion ratio annular reflector antenna folding and unfolding mechanism according to claim 3, characterized in that: The entrance end of the lock tongue passing through the channel is designed as a bell-mouth structure.

5. The folding and unfolding mechanism of the high folding and unfolding ratio annular reflector antenna according to claim 1, characterized in that: The annular scissor mechanism also includes a swing limiting mechanism, which is used to prevent the annular scissor mechanism from arbitrarily rotating around the radial support rod axis during its deployment. The swing limiting mechanism is installed at the middle scissor unit and includes a joint, rod A, rod B, a connecting joint and a limiting shaft. Among them, the top end of rod A is sleeved on the extended shaft of the metal embedded part M3 in the middle scissor unit to form a revolute pair; the top end of rod B is sleeved on the extended shaft of the metal embedded part M3 in the right scissor unit to form a revolute pair; the bottom ends of rods A and B are jointly sleeved on the limiting shaft; The connecting joint is sleeved on the end of the extended shaft of the metal boss B4 in the middle scissor unit to form a revolute pair; a sliding link is designed on the side of the connecting joint, and a limiting groove is opened along the length of the sliding link; the end of the aforementioned limiting shaft is slidably connected to the limiting groove, and the limiting shaft can slide freely within the limiting groove of the sliding link; The above-mentioned rod A, rod B and slide connecting rod form a spherical four-bar mechanism with the connected scissor-type unit, and the limiting axis of the swing limiting mechanism is located in the limiting groove of the connecting joint with the limiting groove, so that the two middle rotation axes are always located in the symmetry plane of the connecting joint with the limiting groove, thereby limiting the swing of the annular scissor-type mechanism relative to the radial support rod.

6. The high-folding-expansion ratio annular reflector antenna folding and unfolding mechanism according to claim 1, characterized in that: In the central extension and retraction mechanism, a guide groove is designed on the outer wall of the inner cylinder along the axial direction of the inner cylinder, which is slidably connected with the guide key on the inner wall of the outer cylinder; a locking assembly, an inner cylinder guide wheel and an inner cylinder line wheel are installed on the circumference of the bottom of the inner cylinder; wherein, the locking assembly has a pop-up lock head, which cooperates with the locking port opened on the upper side wall of the outer cylinder to realize locking of the inner cylinder after it is extended; there are four inner cylinder guide wheels installed on the bottom surface of the lower flange of the inner cylinder, and each two inner cylinder guide wheels form a group, which are arranged in relative positions, and the center connecting line intersects with the inner cylinder; there are two inner cylinder line wheels, which are arranged in relative positions and are coaxial; an outer cylinder guide wheel and an outer cylinder line wheel are installed on the upper part of the outer cylinder; there are four outer cylinder guide wheels and two outer cylinder line wheels; the arrangement positions of the four outer cylinder guide wheels on the upper flange of the outer cylinder correspond to the positions of the four inner cylinder guide wheels and the installation method is the same; the two outer cylinder line wheels are relative, and the axes are perpendicular to the axis of the inner cylinder line wheel; The unfolding of the above-mentioned inner cylinder is realized by the driving assembly; the driving assembly is installed at the bottom of the outer cylinder, and includes a transmission gear set, a winding drum, a driving motor and a reducer, a base reel and a driving rope; among them, there are two winding drums, and the axes are perpendicular to the reels on the inner and outer cylinders, which are fixedly sleeved on the winding drum shaft, and the two winding drums are separated by a partition; limit baffles are also installed at both ends of the winding drum shaft, which cooperate with the partition to prevent the ropes on the two winding drums from falling off the winding drums; the two ends of the winding drum shaft are respectively installed on the bracket A and the bracket B installed inside the base of the outer cylinder through bearings; the output shaft of the driving motor is connected to the reducer, and the reducer is installed inside the base of the outer cylinder through the bracket C, and the output shaft of the reducer is installed on the aforementioned bracket B through a bearing; the transmission gear set includes a large reduction gear and a small reduction gear, which are respectively fixedly sleeved on the output shaft of the reducer and the winding drum shaft, and the two gears mesh with each other; thus, driven by the driving motor, the transmission gear set drives, and drives the two winding drums to rotate synchronously; The above-mentioned two winding drums are used to wind the driving rope. One end of the driving rope is wound around one of the winding drums, and then it passes horizontally through the base pulley designed at the edge position of the top surface of the outer cylinder base on the same side, turns 90 degrees, further passes vertically upward through the top pulley of the outer cylinder on the same side, and then turns 180 degrees vertically downward, further passes through the bottom pulley of the inner cylinder on the same side and turns 90 degrees, then horizontally passes through the bottom pulley of the inner cylinder on the other side and turns 90 degrees again, further upward passes through the top pulley of the outer cylinder on the other side and turns 180 degrees, and finally vertically downward passes through the base pulley designed at the edge position of the top surface of the outer cylinder base on the other side, turns 90 degrees and is wound around the other winding drum; thus, the transmission gear set is driven by the driving motor to drive the two winding drums to wind the driving rope, and then the inner cylinder can be driven to move upward and extend out of the outer cylinder.

7. The folding and unfolding mechanism of the high folding and unfolding ratio annular reflector antenna according to claim 1, characterized in that: The radial support joint includes a locking seat joint, a joint shaft, a locking tongue joint, a sleeve A, a top spring A, a joint synchronization wheel, a sleeve B, a torsion spring buckle A, a torsion spring, a torsion spring buckle B and a top spring B; wherein, the locking seat joint and the locking tongue joint are two spherical structures coaxially connected by the joint shaft; one end of the joint shaft is axially connected to the locking tongue joint and the locking seat joint, and the other end is designed with a D-shaped cross-section segment, which is fitted with the D-shaped hole on the locking tongue joint; and the other end of the joint shaft is axially connected to the locking seat joint; at the same time, the rotation angle of the locking seat joint is determined by the relative sides of the two spherical structure joints. The contact limitation makes the locking seat joint only have a revolute pair that rotates 90° around the joint axis; the above-mentioned joint shaft is sequentially sleeved with a sleeve A, a top spring A, a joint synchronous wheel, a top spring B, a sleeve B, a torsion spring and a sleeve C; the sleeve A and the sleeve B and the top spring B are used to stabilize the joint synchronous wheel in the middle position of the radial support joint; at the same time, a torsion spring buckle A and a torsion spring buckle B are designed on the inner walls of the locking seat joint and the locking tongue joint respectively; wherein, the joint synchronous wheel is key-connected to the joint shaft, and the other parts are compressed by the top spring B; the two ends of the torsion spring are respectively snapped into the torsion spring buckle A and the torsion spring buckle B for fixation.

8. The high-folding-and-expanding ratio annular reflector antenna folding and unfolding mechanism according to claim 1, characterized in that: The end of the radial support rod is installed on the radial support rod connection assembly designed at the bottom of the outer cylinder; the radial support rod connection assembly includes a radial support rod connection seat, a radial support locking mechanism, a bearing seat and a damping plate; the radial support rod connection seat is a cylindrical structure, and the interior is used to insert and fix the radial support rod; a rotating shaft is designed at a relative position on the side of the radial support rod connection seat, and the rotating shaft is connected to the two bearing seats installed on the upper surface of the outer cylinder base through bearings; a radial support locking mechanism is provided on the outside of each bearing seat; The above-mentioned radial support locking mechanism has a disc-shaped shell, which is fixed to the upper surface of the outer cylinder base through a bracket; a circular groove is provided at the center position of the disc-shaped shell, and a fan-shaped groove is provided at the same time, the inner arc surface of which is connected to the circular groove, and a radial support locking block is provided inside the two; the radial support locking block has a circular connecting part and a locking matching protrusion connected to the circular connecting part, which are respectively placed in the circular groove and the fan-shaped groove; and the connecting parts of the two radial support locking blocks are respectively fixed to the ends of the rotating shafts on both sides of the radial support rod connecting seat; thereby, the radial support locking block and the radial support rod connecting seat can rotate together around the axis of the rotating shaft; the side wall of the disc-shaped shell is provided with a circular connecting part and a locking matching protrusion connected to the circular connecting part. A radial support locking channel is also provided, which is connected to the fan-shaped groove of the disc-shaped shell, and a radial support lock head is installed inside; the rotation of the radial support rod can drive the radial support locking block to rotate, and the rotation limit is achieved by cooperating with the locking matching protrusions of the radial support locking block on both sides of the fan-shaped groove; and when the locking matching protrusion is rotated to a circumferential misalignment with the radial support lock head, the radial support lock head can pop out of the radial support locking channel and be inserted into the fan-shaped groove. At this time, the radial support lock head is positioned between the fan-shaped groove and the locking matching protrusion; thereby, the rotation locking of the radial support locking block is achieved, and then the rotation locking of the radial support rod is achieved.

9. The high-folding-and-expanding ratio annular reflector antenna folding and unfolding mechanism according to claim 1, characterized in that: When the scissors-type structure is in a collapsed state, the radial support rods are in a Z-shaped collapsed state, and the inner cylinder is located inside the outer cylinder; at this time, the overall folding and unfolding mechanism maintains this collapsed state; in this state, the middle support rod is installed on the compression release mechanism installed on the side wall of the outer cylinder to maintain the overall collapsed state of the folding and unfolding mechanism; the specific process of unfolding from the collapsed state is: first, the radial support rods are unlocked, and the radial support rods are automatically unfolded to a horizontal straight rod state and locked under the action of the torsion springs in the radial support joints; then the inner cylinder is extended from the outer cylinder, and during the entire extension process, the upper and lower annular slide rails will move along the circumference of the annular slide rails, and then the driving ropes connected to each slider will pull the annular scissors-type structure to unfold; during the unfolding process of the annular scissors-type structure, when the inner cylinder and the outer cylinder are unfolded into place, the central unfolding and retracting mechanism applies sufficient pre-tightening force to the rope, so that the scissors-type structure with the lock tongue and the scissors-type structure with the lock seat are locked with each other, and the entire unfolding process is completed.

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