Large-diameter rib column tensioning type deployable antenna mechanism

Abstract

The invention discloses a large-caliber rib column tensioning type deployable antenna mechanism, relates to a deployable antenna, and aims to solve the problems that an existing tensioning type antenna mechanism is lack of a large-scale deploying mechanism at present, and a large-caliber antenna deploying structure is large in mass and low in rigidity, the large-caliber rib column tensioning type deployable antenna mechanism comprises a telescopic stand column, a plurality of rib units and a motor lead screw speed control unit, the motor lead screw control unit is installed in the middle of the telescopic stand column, the multiple rib units are evenly distributed in the circumferential direction, and the root of each rib unit is connected with the motor lead screw control unit. By adopting the forked design at the tail ends of the ribs, the length of the tension cable at the outermost ring is reduced, so that the suspension depth of the cable is reduced, the effective aperture of a larger antenna can be obtained under the condition that the number of the ribs is small, and the structural mass is lighter due to the small number of the ribs. Through the design of the three circles of crossed tensioning cables between the adjacent ribs, the telescopic stand column in the center and the tensioning cables at the tail ends of the ribs, the structure is tensioned into a whole, and the rigidity of the structure can be improved. The invention belongs to the technical field of aerospace engineering.

Description

Technical Field

[0001] The invention relates to a tensioned antenna, in particular to a large-diameter rib-column tensioned deployable antenna mechanism, and belongs to the technical field of aerospace engineering. Background Art

[0002] With the development of aerospace industry, higher requirements are put forward for the information communication distance and quality of satellite antennas and the resolution of earth observation. Large aperture, light weight, high storage ratio, etc. have become the development trend of space antennas at home and abroad. Space folding and unfolding mechanism has become the application focus of aerospace engineering and has high application value. However, as the application demand of large-aperture antennas becomes more urgent, the quality and rigidity of the unfoldable mechanism have become factors restricting the large-scale development of antenna mechanism.

[0003] In summary, the current development of antenna deployment mechanisms has the following shortcomings:

[0004] The lack of large-sized deployable mechanisms requires lightweight design and structural stiffness optimization design of large-caliber antenna deployment mechanisms. Summary of the invention

[0005] The present invention aims to solve the problems that the existing tensioned antenna mechanism currently lacks a large-scale unfolding mechanism and the large-diameter antenna unfolding structure has a large mass and low rigidity, and further proposes a large-diameter rib column tensioned unfoldable antenna mechanism.

[0006] The technical solutions adopted for the above problems are:

[0007] The invention comprises a telescopic column, a plurality of rib units and a motor screw speed control unit. The motor screw control unit is installed in the middle of the telescopic column. The plurality of rib units are evenly distributed along the circumferential direction. The root of each rib unit is connected to the motor screw control unit.

[0008] Furthermore, each rib unit includes four unit modules, namely a first unit module, a second unit module, a third unit module and a fourth unit module. One end of the second unit module is hinged to the first unit module through a first connecting member, and the other end of the second unit module is hinged to the third unit module and the fourth unit module through a second connecting member, respectively. The third unit module and the fourth unit module are arranged in a V shape with their openings facing outward.

[0009] Further, the first connecting member includes a first hinge joint, a first vertical rod, a second hinge joint, a first connecting rod and a first slider, the first vertical rod is provided with a first hinge joint and a second hinge joint at the upper and lower ends respectively, the first slider is sleeved on the first vertical rod, the two sides of the first slider are rotatably connected to the two first connecting rods, and one end of each connecting rod is rotatably connected to the first slider;

[0010] The second connecting member includes a third hinge joint, a second vertical rod, a fourth hinge joint, a second connecting rod, and a second slider; the upper end of the second vertical rod is connected to the third hinge joint; the lower end of the second vertical rod is connected to the fourth hinge joint, the second slider is mounted on the second vertical rod, and three connecting rods are rotatably connected to the second slider.

[0011] Furthermore, each unit module includes two basic expandable units, which are hinged by a third connecting member, and the third connecting member includes a center rod, a slider, a spring, a fifth articulated joint and a sixth articulated joint; the center rod is sequentially provided with a slider and a spring from top to bottom, the upper end of the center rod is provided with a fifth articulated joint, and the lower end of the center rod is provided with a sixth articulated joint.

[0012] Furthermore, each basic expandable unit includes a small support rod, an upper chord rod, a lower chord rod, a small diagonal web rod and a large diagonal web rod, one end of the upper chord rod is connected to the upper end of the center rod of the third connecting member through a fifth hinge joint, one end of the lower chord rod is connected to the lower end of the center rod of the third connecting member through a sixth hinge joint, one end of the small diagonal web rod is connected to the fifth hinge joint, and the other end is connected to one end of the large diagonal web rod, one end of the small support rod is connected to the slider in the third connecting member, and the other end is connected to the small diagonal web rod.

[0013] Furthermore, the motor screw control unit includes a top plate, a bottom plate, a motor, a motor bracket, a third slider, a screw, a bearing and a connecting rod. The motor is fixedly connected to the bottom plate through the motor bracket, one end of the screw is connected to the motor output shaft, and the other end is connected to the top plate through the bearing. The third slider is mounted on the screw and threadedly connected to the screw. The outer end of the third slider is provided with a plurality of connecting rods along the circumferential direction, and the end of each connecting rod is rotatably connected to a connecting rod.

[0014] Furthermore, the large-diameter rib-column tensioned deployable antenna mechanism also includes inter-rib tension cables and column tension cables, wherein the inter-rib tension cables are connected to the rib units, one end of the column tension cables is connected to the end of the rib units, and the other end of the column tension cables is connected to the upper and lower ends of the retractable columns.

[0015] Furthermore, there are two retractable column structures, which are respectively located on the upper and lower surfaces of the motor screw control unit. Each retractable column structure includes a fixed cylinder, a first moving cylinder and a second moving cylinder. The fixed cylinder, the first moving cylinder and the second moving cylinder are slidably connected in sequence from the outside to the inside.

[0016] Furthermore, a rope driving and collecting device is provided at the bottom end of each fixed cylinder; the device includes two rope wheels, and each rope wheel is provided with three rope winding grooves.

[0017] Furthermore, the upper end of the fixed cylinder, the upper and lower ends of the first moving cylinder, and the lower end of the second moving cylinder are all provided with fixed pulleys for winding ropes.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention comprises a plurality of basic expandable units with the same parameters, which are spliced ​​to form a bifurcated rib unit, and the number of rib units can be adjusted to adapt to different calibers;

[0020] 2. The present invention has the same basic expandable unit parameters, adjacent units are synchronized by connecting rods, and the rest are synchronized by shared driving springs. Each rib unit is synchronized by the central screw-connecting rod speed control. Compared with the commonly used motor rope speed control, it is lighter in weight, has no complex rope structure, and avoids the risk of entanglement;

[0021] 3. The present invention adopts a bifurcated design at the end of the rib, which reduces the length of the tension cable in the outermost circle, so that the rope hanging depth is reduced, and the effective diameter of a larger antenna can be obtained with a small number of ribs. The small number of ribs also makes the structure lighter;

[0022] 4. The three circles of cross-rib tension cables between adjacent ribs and the design of the central retractable column and the column tension cables at the end of the rib make the structure tensioned as a whole, which can improve the rigidity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention in an expanded state;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention in a folded state;

[0025] Figure 3 is the structural diagram of the rib unit;

[0026] Figure 4 It is a schematic diagram of the node position of a single rib;

[0027] Figure 5 is a schematic structural diagram of a first connecting member;

[0028] Figure 6 is a schematic structural diagram of a second connecting member;

[0029] Figure 7 Schematic diagram of the structure of the third connecting member.

[0030] Figure 8 It is a simplified structural diagram of the basic expandable unit;

[0031] Fig. 9 This is a schematic diagram of the right-angle joint of the large diagonal brace;

[0032] Fig.10 is a schematic diagram of the structure of the rotating joint in the third connecting member;

[0033] Fig.11It is a structural diagram of the motor screw control unit;

[0034] Fig.12 is a structural schematic diagram of a tension cable unit;

[0035] Fig.13 It is a schematic diagram of the principle of the rope drive sleeve;

[0036] Fig.14 It is a schematic diagram of the structure of the retractable column;

[0037] Fig.15 It is a schematic diagram of the structure of a rope pulley;

[0038] Fig.16 It is a structural diagram of a fixed pulley;

[0039] Fig.17 It is a schematic diagram of the structure of the locking device between the sleeves in the telescopic column.

[0040] In the figure: 1-retractable column; 1-1-fixed cylinder, 1-2-first moving cylinder; 1-3 second moving cylinder; 2-rib unit; 3-inter-rib tension cable; 4-motor screw speed control unit; 5-first connecting piece; 5-1-first hinge joint; 5-2-first vertical rod; 5-3-second hinge joint; 5-4-first connecting rod; 5-5-first slider; 6-second connecting piece; 6-1-third hinge joint; 6-2-second vertical rod; 6-3-fourth hinge joint; 6-4 second connecting rod; 6-5-second slider; 7-third connecting piece hinge; 7-1-center rod; 7-2-slider; 7-3-spring; 7-4 fifth hinge Joint; 7-5-sixth articulated joint; 8-basic expandable unit; 8-1-small support rod; 8-2-upper chord rod; 8-3-lower chord rod; 8-4-small diagonal web rod; 8-5-large diagonal web rod; 9-top plate; 10-bottom plate; 11-motor; 12-motor bracket; 13-third slider; 14-screw rod; 15-bearing; 16-connecting rod; 17-pulley; 18-pin shaft; 19-copper sleeve; 20-opening pin; 21-A hinge; 22-spring; 23-locking pin; 24-B hinge; 25-locking hole; 26-unlocking screw; 27-locking hole; 28-threaded fixing hole; 29-inner guide rail; 30-column tensioning cable. DETAILED DESCRIPTION

[0041] The large-diameter rib-column tensioned expandable antenna mechanism described in this embodiment increases the rib nodes on the outermost circle, reduces the overhang depth, and improves the effective diameter of the rib antenna through the split structure design at the end of the rib unit.

[0042] like Figure 1 and Figure 2As shown, this embodiment includes a telescopic column 1, a plurality of rib units 2, inter-rib tension cables 3, column tension cables 30 and a motor screw speed control unit 4.

[0043] like Figure 3 , Figure 4 As shown, each rib unit 2 is in a "Y"-shaped structure, and each rib unit 2 includes four unit modules, which are respectively a first unit module A, a second unit module B, a third unit module C and a fourth unit module D. One end of the second unit module B is hinged to the first unit module A through a first connecting member 5, and the other end of the second unit module B is hinged to the third unit module C and the fourth unit module D through a second connecting member 6. The third unit module C and the fourth unit module D are designed in a "V"-shaped bifurcation, with the opening facing outward. The angle between the third unit module C and the fourth unit module D is 45°.

[0044] like Figure 5 As shown, the first connecting member 5 includes a first hinge joint 5-1, a first vertical rod 5-2, a second hinge joint 5-3, a first connecting rod 5-4 and a first slider 5-5. The first vertical rod 5-2 is provided with a first hinge joint 5-1 and a second hinge joint 5-3 at the upper and lower ends respectively. The first slider 5-5 is mounted on the first vertical rod 5-2. The two sides of the first slider 5-5 are rotationally connected to two first connecting rods 5-4. One end of each connecting rod 5-4 is rotationally connected to the first slider 5-5, and the other end is rotationally connected to the upper chord rods of the adjacent left and right units. The function of the connecting rod is to ensure that the expansion angles of the two upper chord rods always remain the same.

[0045] like Figure 6 As shown, the second connecting member 6 includes a third hinge joint 6-1, a second vertical rod 6-2, a fourth hinge joint 6-3, a second connecting rod 6-4, and a second slider 6-5; the upper end of the second vertical rod 6-2 is connected to the third hinge joint 6-1; the lower end of the second vertical rod 6-2 is connected to the fourth hinge joint 6-3, and the second slider 6-5 is mounted on the second vertical rod 6-2. Three second connecting rods 6-4 are rotatably connected to the second slider, and the three connecting rods 6-4 are rotatably connected to the upper chords of the adjacent left and right units respectively. The upper and lower hinge joints of the second vertical rod 6-2 are also designed to be forked, and the fork angle is 45 degrees, and a three-connecting rod and forked slider design is adopted.

[0046] like Figure 7As shown, each unit module includes two basic expandable units 8, and the two basic expandable units 8 are hinged by a third connecting member 7. The third connecting member 7 includes a central rod 7-1, a slider 7-2, a spring 7-3, a fifth hinge joint 7-4 and a sixth hinge joint 7-5; the central rod 7-1 is sequentially provided with a slider 7-2 and a spring 7-3 from top to bottom, the upper end of the central rod 7-1 is provided with a fifth hinge joint 7-4, and the lower end of the central rod 7-1 is provided with a sixth hinge joint 7-5.

[0047] That is, there are eight basic expandable units on each rib, of which each bifurcated structure (i.e., the third unit module C and the fourth unit module D) has two basic expandable units, so the bifurcated structure has four basic expandable units. The more units on the bifurcations, that is, the closer the bifurcations are to the central connecting plate, the more expandable units on each rib will be, and the greater the mass will be. When the number of units on the bifurcations is small, the bifurcations are too short, and it is impossible to ensure that the end nodes of the bifurcations are evenly distributed on the outermost envelope circle. The angle of the bifurcations is related to the length of the bifurcations and the distribution position of the end nodes of the bifurcations. When designing, the number of units on the ribs should be small (light mass) and the end nodes should be evenly distributed to determine the bifurcations and the number of units on the bifurcations.

[0048] like Figure 8 As shown, each basic expandable unit 8 includes a small support rod 8-1, an upper chord rod 8-2, a lower chord rod 8-3, a small diagonal web rod 8-4 and a large diagonal web rod 8-5, one end of the upper chord rod is connected to the upper end of the center rod of the third connecting member through a fifth hinge joint, one end of the lower chord rod is connected to the lower end of the center rod of the third connecting member through a sixth hinge joint, one end of the small diagonal web rod is connected to the fifth hinge joint, and the other end is connected to one end of the large diagonal web rod 8-5, one end of the small support rod is connected to the slider in the third connecting member, and the other end is connected to the small diagonal web rod.

[0049] The joint of the large diagonal brace 8-5 is designed to be connected to the joint of the lower chord bar connected to the vertical bar at a right angle. This design is to ensure that the large diagonal brace 8-5 is parallel to the lower chord bar when the unit is folded, so as to avoid excessive occupation of the internal space formed by the upper bar and the lower bar when the unit is folded due to the large diagonal brace 8-5 and the lower chord bar having a certain angle. Fig. 9 As shown, the diagonal rod is parallel to the lower rod, occupying the smallest internal space, avoiding structural interference and reducing the volume envelope when folded.

[0050] like Fig.10As shown, the shaft design at the rotating joint in the third connecting member 7 is shown in the figure. There is a pin 18, two copper sleeves 19 and an end-fixed cotter pin 20 at the joint. The copper sleeve 19 is between the pin 18 and the A hinge 21, which reduces the friction at the rotating joint and improves the rotation accuracy. The locking principle is to use the spring 22 to push the locking pin 23 into the locking hole 25 on the B hinge 24 to form a joint lock. When the mechanism is deployed in place, the locking holes 25 on the A hinge 21 and the B hinge 24 are concentric, so the locking pin 23 is inserted into the hole under the elastic force of the spring 22. During the ground experiment, it is necessary to repeatedly lock, unlock, expand and retract. Just push the unlocking screw 26 along the slot to drive the locking pin 23 to move inward to unlock.

[0051] like Fig.11 As shown, the motor screw control unit 4 includes a top plate 9, a bottom plate 10, a motor 11, a motor bracket 12, a third slider 13, a screw 14, a bearing 15 and a connecting rod 16. The motor 11 is fixedly connected to the bottom plate 10 through the motor bracket 12. One end of the screw 14 is connected to the motor output shaft, and the other end is connected to the top plate 9 through the bearing 15. The third slider 13 is sleeved on the screw 14 and is threadedly connected to the screw 14. The outer end of the third slider 13 is provided with a plurality of connecting rods along the circumferential direction, and the end of each connecting rod is rotatably connected to a connecting rod 16.

[0052] The edges of the top plate 9 and the bottom plate 10 are provided with a plurality of connection holes along the circumferential direction for connection with the root of the rib unit. The outer edge connection hole of the top plate 9 is connected to the hinge joint of the upper chord rod 8-2 at the root of the rib unit, and the outer edge connection hole of the bottom plate 10 is connected to the hinge joint of the lower chord rod 8-3 at the root of the rib unit. When the motor 11 drives the screw rod 14 to rotate, the third slider 13 can reciprocate up and down in the vertical direction. The outer end of the third slider 13 is provided with a plurality of connection rods along the circumferential direction. One end of the connecting rod 16 is rotationally connected to the connection rod of the third slider 13, and the other end is rotationally connected to the upper chord rod 8-2. The unfolding angle of the upper chord rod is controlled by the motor.

[0053] The large-diameter rib column tensioned deployable antenna mechanism further comprises an inter-rib tension cable 3 and a column tension cable 30. The inter-rib tension cable 3 is arranged at a position as shown in FIG. Fig.12 As shown, a total of three circles of cables are designed. The inter-rib tension cables 3 are laid on the two connected rib units 2 and between the forks on the rib units. The inter-rib tension cables 3 are cross-arranged and respectively connected to the upper and lower hinged joints of the vertical rods; the column tension cable 30 is spindle-shaped, one end of the column tension cable 30 is connected to the end of the rib unit 2, and the other end of the column tension cable 30 is connected to the upper and lower ends of the telescopic column 1.

[0054] In order to improve the overall rigidity of the deployment mechanism, referring to the design of the ring rib deployment antenna structure, the upper and lower extendable columns 1 are designed, and the column tension cables 30 are connected from the ends of the columns to the ends of the rib units 2. From the structural analysis, it can be seen that the arc-shaped ribs will deform under the tension of the three-circle inter-rib tension cables 3, and the arc-shaped rib structure has a tendency to deform inwardly. Adding the upper and lower column tension cables 30 can effectively reduce the deformation.

[0055] There are two telescopic column structures 1, and the two extension columns work independently and are respectively located on the upper and lower surfaces of the motor screw control unit 4. Each telescopic column structure 1 includes a fixed cylinder 1-1, a first moving cylinder 1-2 and a second moving cylinder 1-3. The fixed cylinder 1-1, the first moving cylinder 1-2 and the second moving cylinder 1-3 are slidably connected in sequence from the outside to the inside.

[0056] like Figure 13-14 As shown, the two moving cylinders are folded in the fixed cylinder 1-1, and the whole mechanism is in a folded state. The inner surface of the fixed cylinder 1-1, the inner and outer surfaces of the first moving cylinder 1-2, and the inner surface of the second moving cylinder 1-3 are evenly distributed with three linear guides 1-4. The lower end of the first moving cylinder 1-2 is provided with three pulleys that slide with the linear guides on the inner surface of the fixed cylinder; the upper end of the first moving cylinder 1-2 is provided with three pulleys that slide with the three linear guides of the second moving cylinder; the lower end of the second moving cylinder 1-3 is provided with three pulleys that slide with the three linear guides of the first moving cylinder. Ensure the linear motion accuracy of the moving cylinder when it is unfolded. The fixed cylinder 1-1 is the cylinder with the largest diameter of the sleeve-type extension mechanism, which provides storage and movement space for the inner cylinder. The first moving cylinder 1-2 is located inside the fixed cylinder 1-1, and the outer diameter of the first moving cylinder 1-2 is reduced by 20mm relative to the outer diameter of the cylinder 1, and the second moving cylinder 1-3 is also the same relative to the first moving cylinder 1-2. The two adjacent cylinders are connected by sliding fit of pulleys and guides. The lower pulley on the lower joint of the first moving cylinder 1-2 is slidably matched with the inner guide rail of the fixed cylinder 1-1, and a locking mechanism is provided between each sleeve. The locking pin moves along the inner guide rail 29 during the unfolding process of the column until it moves to the position of the locking hole 27 and then is inserted into the locking hole 27 under the thrust of the spring to achieve locking in place. Fig.17 shown.

[0057] Fixed pulleys for winding ropes are provided at the upper end of the fixed cylinder 1-1, the upper and lower ends of the first moving cylinder 1-2, and the lower end of the second moving cylinder 1-3. Fig.15As shown. The winch mechanism works and starts to retract the rope. The first moving cylinder 1-2 is lifted by the fixed pulley to achieve deployment. The second moving cylinder 1-3 and the fixed cylinder 1-1 are connected by a fixed-length rope. Then, the moving second moving cylinder 1-3 will inevitably move outward as the moving first moving cylinder 1-2 extends, thereby achieving the synchronous deployment of the mechanism. Then, the locking mechanism works to lock the mechanism. When the mechanism needs to be retracted, the motor only needs to run in reverse to drive the reversely arranged rope pulley drive system to achieve the synchronous retraction of the mechanism. The principle diagram of the rope-driven sleeve scheme is shown in Fig.13 shown.

[0058] like Fig.15 As shown, a rope driving and gathering device is provided at the bottom end of each fixed cylinder; the device includes a motor, a gear set and two rope wheels 17, each rope wheel 17 is provided with three rope winding grooves, three unfolding ropes are wound on one rope wheel 17, and three gathering ropes are wound on the other rope wheel 17. The two rope wheels 17 are driven by a motor to drive the gear transmission, and the parameters of the two gears are the same, because the ratio of the movement length of the recovery and release ropes is 1:1. The output shaft of the motor is connected to a rope wheel through a driving gear, and the driven gear is meshed with the driving gear and connected to the other rope wheel. The two rope wheels rotate in opposite directions, so when the unfolding rope and the gathering rope are wound in the same direction, when the motor drives the rope pulley to rotate, one realizes the gathering and winding of the unfolding rope, and the other wheel realizes the release of the gathering rope.

[0059] Working process:

[0060] The steps for unfolding the antenna mechanism are as follows: after the mechanism is unlocked, the basic expandable unit on the rib is gradually unfolded under the elastic force of the driving spring 7-3. While unfolding, due to the action of the slider 5-5 and the connecting rod 5-4, the unfolding angle of each unit module is the same. The motor screw control unit located at the center position controls the unfolding speed. The motor 11 drives the screw rod 14 to rotate while the slider 13 sleeved on the screw rod 14 moves upward. The unfolding angle of the upper rod in the unit is controlled by the connecting rod 16. When all the rib units are unfolded and locked in place, the column 1 begins to unfold, and the motor in the rope drive and retracting device starts, driving the unfolding rope to be wound around the rope wheel, and the retracting rope is released, and each level of sleeve is unfolded and locked in place.

[0061] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A large-diameter rib-column tensioned deployable antenna mechanism, characterized in that: The large-caliber rib column tensioned deployable antenna mechanism comprises a telescopic column (1), a plurality of rib units (2) and a motor screw speed control unit (4), wherein the motor screw control unit (4) is installed in the middle of the telescopic column (1), the plurality of rib units (2) are evenly distributed along the circumferential direction, and the root of each rib unit (2) is connected to the motor screw control unit (4).

2. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 1, characterized in that: Each rib unit (2) comprises four unit modules, namely a first unit module (A), a second unit module (B), a third unit module (C) and a fourth unit module (D); one end of the second unit module (B) is hinged to the first unit module (A) via a first connecting member (5); the other end of the second unit module (B) is hinged to the third unit module (C) and the fourth unit module (D) via a second connecting member (6); the third unit module (C) and the fourth unit module (D) are arranged in a V shape with their openings facing outward.

3. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 2, characterized in that: The first connecting member (5) comprises a first hinge joint (5-1), a first vertical rod (5-2), a second hinge joint (5-3), a first connecting rod (5-4) and a first sliding block (5-5); the first hinge joint (5-1) and the second hinge joint (5-3) are respectively provided at the upper and lower ends of the first vertical rod (5-2); the first sliding block (5-5) is sleeved on the first vertical rod (5-2); two sides of the first sliding block (5-5) are rotatably connected to the two first connecting rods (5-4); and one end of each connecting rod (5-4) is rotatably connected to the first sliding block (5-5); The second connecting member (6) comprises a third hinge joint (6-1), a second vertical rod (6-2), a fourth hinge joint (6-3), a second connecting rod (6-4), and a second sliding block (6-5); the upper end of the second vertical rod (6-2) is connected to the third hinge joint (6-1); the lower end of the second vertical rod (6-2) is connected to the fourth hinge joint (6-3); the second sliding block (6-5) is sleeved on the second vertical rod (6-2); and the second sliding block (6-5) is rotatably connected to three second connecting rods (6-4).

4. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 1, characterized in that: Each unit module comprises two basic expandable units (8), the two basic expandable units (8) are hingedly connected via a third connecting member (7), the third connecting member (7) comprising a central rod (7-1), a slider (7-2), a spring (7-3), a fifth hinge joint (7-4) and a sixth hinge joint (7-5); the central rod (7-1) is sequentially provided with a slider (7-2) and a spring (7-3) from top to bottom, the upper end of the central rod (7-1) is provided with a fifth hinge joint (7-4), and the lower end of the central rod (7-1) is provided with a sixth hinge joint (7-5).

5. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 4, characterized in that: Each basic expandable unit (8) comprises a small support rod (8-1), an upper chord rod (8-2), a lower chord rod (8-3), a small diagonal web rod (8-4) and a large diagonal web rod (8-5); one end of the upper chord rod (8-2) is connected to the upper end of the central rod (7-1) of the third connecting member (7) via a fifth hinge joint (7-4); one end of the lower chord rod (8-3) is connected to the lower end of the central rod (7-1) of the third connecting member (7) via a sixth hinge joint (7-5); one end of the small diagonal web rod (8-4) is connected to the fifth hinge joint (7-4), and the other end is connected to one end of the large diagonal web rod (8-5); one end of the small support rod (8-1) is connected to a slider (7-2) in the third connecting member (7), and the other end is connected to the small diagonal web rod (8-4).

6. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 1, characterized in that: The motor screw control unit comprises a top plate (9), a bottom plate (10), a motor (11), a motor bracket (12), a third slider (13), a screw (14), a bearing (15) and a connecting rod (16); the motor (11) is fixedly connected to the bottom plate (10) via the motor bracket (12); one end of the screw (14) is connected to the output shaft of the motor (11), and the other end is connected to the top plate (9) via the bearing (15); the third slider (13) is sleeved on the screw (14) and is threadedly connected to the screw (14); a plurality of connecting rods are arranged at the outer end of the third slider (13) along the circumferential direction; the end of each connecting rod is rotatably connected to a connecting rod (16).

7. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 1, characterized in that: The large-diameter rib column tensioned deployable antenna mechanism further comprises an inter-rib tension cable (3) and a column tension cable (30), wherein the inter-rib tension cable (3) is connected to the rib unit (2), one end of the column tension cable (30) is connected to the end of the rib unit (2), and the other end of the column tension cable (30) is connected to the upper and lower ends of the telescopic column (1).

8. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 1, characterized in that: There are two retractable columns (1), which are respectively located on the upper and lower surfaces of the motor screw control unit (4); each retractable column structure (1) comprises a fixed cylinder (1-1), a first moving cylinder (1-2) and a second moving cylinder (1-3); the fixed cylinder (1-1), the first moving cylinder (1-2) and the second moving cylinder (1-3) are slidably connected in sequence from outside to inside.

9. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 8, characterized in that: The bottom end of each fixed cylinder is provided with a rope driving and collecting device; the device comprises two rope wheels (17), and each rope wheel (17) is provided with three rope winding grooves.

10. The large-diameter rib-column tensioned deployable antenna mechanism according to claim 8, characterized in that: The upper end of the fixed cylinder (1-1), the upper and lower ends of the first moving cylinder (1-2) and the lower end of the second moving cylinder (1-3) are all provided with fixed pulleys for winding ropes.

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