Radial rib type deployable antenna rib connecting mechanism with self-locking function and working method

Abstract

The invention discloses a radial rib type deployable antenna rib connecting mechanism with a self-locking function and a working method. The radial rib type deployable antenna rib connecting mechanism comprises radial ribs, inter-rib connecting pieces and locking assemblies. A positioning hole is formed in the upper end of the inter-rib connecting piece, and an arc-shaped limiting groove is formed in the lower end of the inter-rib connecting piece; the radial ribs are hinged to the connecting pieces between the ribs through check rings, and the check rings penetrate through the positioning holes and are arranged in the arc-shaped limiting grooves in a sliding mode. The locking assembly is mounted on the inter-rib connecting piece and comprises a stop lever and a tension spring; one end of the stop lever is hinged to the connecting piece between the ribs, the other end of the stop lever is connected with the tension spring, and when the radial ribs are unfolded in place, the stop lever abuts against the check ring under the action of the tension spring. When the ribs are unfolded in place, the self-locking function of the ribs is achieved, and the device has the advantages of being simple in structure, light, compact and high in reliability.

Description

Technical Field

[0001] This invention belongs to the field of spaceborne antennas and relates to a radial rib type deployable antenna rib connection mechanism with self-locking function and its working method. Background Technology

[0002] In the field of spaceborne deployable antennas, radial rib and ring truss antennas are the two most widely used core structural forms. Radial rib antennas radiate ribs from a central body, resulting in a small storage volume and a large unfolding ratio, suitable for small-to-medium aperture communication needs. However, their structural rigidity depends on the strength of the ribs themselves, and they are prone to bending and deformation in large-aperture scenarios, leading to a decrease in accuracy. Ring truss antennas, on the other hand, are supported by a ring truss composed of hinged rods, offering high rigidity and outstanding load-bearing capacity, meeting the design requirements of large apertures. To balance the comprehensive needs of large aperture, high rigidity, and small storage volume, a combined radial rib and ring truss antenna, integrating the advantages of both types, has emerged. Its structural complementarity has made it a core component for critical missions such as deep space exploration and communication satellites.

[0003] Combined antennas require extremely high structural coordination. Not only must the rigid fit between the ribs and the annular truss be ensured, but reliable connections between the radial ribs must also be achieved. Furthermore, the rib extension and retraction must be precisely synchronized with the truss drive. This makes the rib connection mechanism a core component determining the antenna's on-orbit performance. However, existing connection solutions struggle to meet these requirements: traditional mechanisms can only achieve simple connections between ribs, requiring additional transition structures to connect the truss, resulting in weight redundancy and structural complexity. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a radial rib type deployable antenna rib connection mechanism and working method with self-locking function. When the rib is deployed into place, the rib self-locking function is realized. It has the advantages of simple structure, light weight and compact size, and high reliability.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A radial rib type deployable antenna rib connection mechanism with self-locking function includes radial ribs, rib connectors and locking components; The upper end of the inter-rib connector is provided with a positioning hole, and the lower end of the inter-rib connector is provided with an arc-shaped limiting groove; the radial rib is hinged to the inter-rib connector through a retaining ring, and the retaining ring passes through the positioning hole and is slidably set in the arc-shaped limiting groove. The locking assembly is installed on the inter-rib connector and includes a stop bar and a tension spring. One end of the stop bar is hinged to the inter-rib connector and the other end of the stop bar is connected to the tension spring. When the radial rib is fully extended, the stop bar abuts against the retaining ring under the action of the tension spring.

[0006] Optionally, the stop lever includes a positive stop lever and a negative stop lever, which are symmetrically arranged about the horizontal plane of the central axis of the stop ring; the boss on the positive stop lever is connected to the boss on the negative stop lever by a tension spring.

[0007] Optionally, the connecting piece between the ribs is provided with a stop rod positioning shaft and a stop rod limiting shaft; the head of the stop rod is provided with a through hole and is sleeved on the stop rod positioning shaft, and the stop rod rests on the stop rod limiting shaft under the action of the tension spring.

[0008] Optionally, the positioning shaft and the limiting shaft of the stop lever are located outside the envelope of the retaining ring, and the positioning shaft and the limiting shaft of the stop lever are tangent to the envelope of the retaining ring.

[0009] Optionally, the arc-shaped limiting groove is a quarter-circle arc groove, with the center of the arc groove located at the center of the positioning hole at the upper end of the rib connector.

[0010] Optionally, the radial ribs include inner ribs and outer ribs; the outer end of the inner rib is connected to the inner end of the outer rib through an inter-rib connector.

[0011] Optionally, it also includes rib truss connectors and rib connecting blocks for the annular truss; the outer ends of the outer ribs are hinged to the rib connecting blocks via rib truss connectors.

[0012] Optionally, the rib truss connector includes a rectangular member and a D-shaped member that are fixed together as one piece; the rectangular member is fixedly installed on the rib connector block, and the D-shaped member is arranged along the radial rib direction.

[0013] Optionally, the D-shaped part is provided with a cylindrical boss and an arc-shaped limiting groove; the mounting hole at the lower end of the outer rib is fitted onto the cylindrical boss, and the retaining ring passes through the arc-shaped limiting groove and connects to the upper end of the outer rib.

[0014] A method for operating a radial rib-type deployable antenna rib connection mechanism with self-locking function includes the following steps: The radial ribs unfold, causing the retaining ring to slide from the top to the bottom along the arc-shaped limiting groove on the connecting piece between the ribs; The retaining ring contacts the bottom of the retaining lever of the locking assembly, pushing the retaining lever to rotate and lift around the hinge point, and the tension spring extends accordingly; The radial ribs are fully extended, the retaining ring passes over the retaining rod, and the retaining rod is reset under the tension of the tension spring; The stop lever abuts against the retaining ring, restricting the retaining ring from sliding in the opposite direction along the arc-shaped limiting groove, thereby achieving self-locking of the radial ribs.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes an arc-shaped limiting groove in the rib-connecting component, which engages with a spring-driven stop bar, to directly drive the locking action through the mechanical motion of the radial ribs during deployment. The principle is as follows: during rib deployment, the retaining ring slides along the arc-shaped groove and pushes open the stop bar (at this time, the tension spring stores energy). Once the rib reaches the predetermined deployment position, the retaining ring passes the stop bar, and the stop bar instantly resets under the restoring force of the tension spring and abuts against the retaining ring. This achieves passive automatic locking, eliminating the need for additional motors or complex electronically controlled locking devices, significantly simplifying the structure, reducing the weight of the mechanism, and preventing locking failures due to control system malfunctions, thereby improving the reliability of on-orbit antenna deployment.

[0016] Furthermore, a structure is adopted in which the positive and negative stop levers are symmetrically arranged about the horizontal plane and interconnected by tension springs. The principle is that a single tension spring simultaneously connects two symmetrical stop levers, ensuring that the two stop levers maintain synchronized movement and force balance under the action of the spring tension. This greatly improves the structural stability and reliability of the locking mechanism. The symmetrical design counteracts the lateral torque that may be generated by unilateral locking, preventing the mechanism from jamming. At the same time, the double-stop lever interlocking mechanism provides redundancy protection, ensuring that the locked state remains stable even under harsh mechanical environments (such as vibration and impact), which is superior to traditional single-sided locking structures.

[0017] Furthermore, the positional relationship between the positioning axis of the stop lever and the limiting axis is defined as being outside the envelope of the retaining ring and tangent to each other. The principle is: based on geometric envelope analysis, the rotation fulcrum and limiting point of the locking component are precisely arranged at the edge of the extreme trajectory of the moving part (retaining ring). This achieves extreme compactness of the mechanism, minimizing the volume of the connecting mechanism while ensuring sufficient rotation space for the stop lever and preventing motion interference with the retaining ring. For space-constrained space-based equipment, this effectively saves valuable storage space and improves the antenna's storage ratio.

[0018] Furthermore, a D-shaped component with an arc-shaped limiting groove was designed at the connection between the rib and the truss. The principle is to use the arc-shaped groove on the D-shaped component to forcibly guide the unfolding movement of the rib root. This not only limits the maximum unfolding angle of the rib, but more importantly, defines a unique and definite trajectory for the rib's unfolding, preventing swaying or path deviation due to insufficient rigidity during the unfolding process. This ensures the surface accuracy of the antenna reflector after unfolding and solves the problem of reduced accuracy caused by the easy bending and deformation of traditional radial ribs under large apertures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the radial rib deployable antenna rib connection mechanism with self-locking function of the present invention in its deployed state. Figure 2 This is a schematic diagram of the overall structure of the radial rib type deployable antenna rib connection mechanism with self-locking function of the present invention in its retracted state. Figure 3 This is a schematic diagram of the interconnection between the ribs in the structure of the present invention; Figure 4 This is a schematic diagram of the interconnection between the ribs and the truss in the structure of the present invention; Figure 5 This is a schematic diagram of the locking component in the structure of the present invention.

[0020] Wherein: radial rib; 11-inner rib; 12-outer rib; 2-rib connector; 21-positioning hole; 22-arc-shaped limiting groove; 23-stop positioning shaft; 24-stop limiting shaft; 25-retaining ring; 26-screw; 3-rib truss connector; 31-rectangular piece; 32-D-shaped piece; 33-arc-shaped limiting groove; 34-mounting hole; 35-countersunk screw; 4-locking assembly; 41-stop bar; 411-positive stop bar; 412-reverse stop bar; 42-tension spring; 5-rib connector block of the annular truss. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms “installation,” “connection,” and “linkage” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or a connection that allows communication; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements or an interaction between two elements. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] like Figure 1 As shown, the radial rib-type deployable antenna rib connection mechanism with self-locking function according to the present invention includes at least: radial ribs 1, rib-to-rib connectors 2, rib truss connectors 3, locking components 4, and rib connecting blocks 5 of annular trusses. The outer end of the inner rib 11 of the radial ribs is connected to the inner end of the outer rib 12 through the rib-to-rib connectors 2, and the outer end of the outer rib 12 is hinged to the rib connecting blocks 5 of the annular truss through the rib truss connectors 3. The locking components 4 are sleeved on the rib-to-rib connectors 2, and realize the rib self-locking function when the ribs are deployed into place.

[0027] Please see again. Figure 2 The radial rib 1 includes an inner rib 11 near the center of the antenna and an outer rib 12 near the annular truss. The rib is further divided into an inner end and an outer end. The inner and outer ends are provided with mounting holes at a certain interval. The upper and lower surfaces of the rib are parabolic surfaces and are arranged circumferentially around the center of the radially deployable antenna.

[0028] Furthermore, in this embodiment, the inter-rib connector 2 includes a positioning hole 21, an arc-shaped limiting groove 22, a stop rod positioning shaft 23, a stop rod limiting shaft 24, a retaining ring 25, and a screw 26.

[0029] Specifically, please see Figure 3 , Figure 3 This is a schematic diagram of the structure in which the ribs are connected to each other in the present invention. As can be seen, the overall structure of the rib connector 2 in this embodiment is symmetrical about the central axis. There are two positioning holes 21 at the upper end. Both positioning holes 21 are through holes. The central axis of the retaining ring 25 passes through the positioning holes 21 and is connected to the upper mounting hole and screw 26 of the radial rib 1. The two positioning holes 21 are symmetrically arranged along the central axis of the rib connector 2. The distance between the positioning holes 21 needs to ensure that the ribs do not interfere with each other during the extension and retraction process.

[0030] Two arc-shaped limiting grooves 22 are opened at the lower end of the inter-rib connector 2. The arc-shaped limiting grooves 22 are symmetrically arranged about the central axis of the inter-rib connector 2. The central axis of the retaining ring 25 passes through the positioning hole 21 and is connected to the lower end mounting hole of the inner rib 11 and the screw 26. It slides along the arc-shaped limiting grooves 22 to realize the expansion and contraction of the radial rib 1. The arc-shaped limiting groove 22 is a quarter-circle arc groove, the center of which is located at the center of the positioning hole at the upper end of the inter-rib connector 1, and the radius is the distance between the two mounting holes at one end of the inner rib 11.

[0031] The inter-rib connector 2 is provided with a stop rod positioning shaft 23 and a stop rod limiting shaft 24. The stop rod positioning shaft 23 is hinged to the through hole of the stop rod 41 in the locking assembly 4. The stop rod limiting shaft 24 can prevent the stop rod 41 from exceeding the range of motion. In order not to interfere with the retaining ring 25, the positions of the stop rod positioning shaft 23 and the stop rod limiting shaft 24 are outside the envelope of the retaining ring 25. In order to make the structure compact, the stop rod positioning shaft 23 and the stop rod limiting shaft 24 are tangent to the envelope of the retaining ring 25.

[0032] Furthermore, the rib truss connector in this embodiment includes a rectangular part 31, a D-shaped part 32, an arc-shaped limiting groove 33, a mounting hole 34, and a countersunk screw 35.

[0033] Specifically, please see Figure 4 , Figure 4This is a schematic diagram of the structure in which the ribs and trusses are connected. As can be seen, the rectangular part 31 and the D-shaped part 32 of the connector are fixed together. The width of the rectangular part 31 and the position of the mounting hole 34 are consistent with the rib connecting block 5 of the annular truss. The rib truss connector 3 is fixedly connected to the truss by countersunk screws 35. The D-shaped part 32 is arranged along the rib direction and has a cylindrical boss and an arc-shaped limiting groove 33. The mounting hole at the lower end of the outer rib 12 is fitted onto the cylindrical boss and is hinged by the central axis of the retaining ring 25 and the screw. The central axis of the retaining ring 25 passes through the arc-shaped limiting groove 33 and is hinged to the mounting hole at the upper end of the outer rib 12 by screws 26. The arc-shaped limiting groove 33 is used to limit the unfolding trajectory and maximum unfolding angle of the radial rib 1, thereby ensuring that the radial rib 1 moves along the predetermined path without deviation during the unfolding process, and ensuring the stability of the unfolding process.

[0034] Furthermore, in this embodiment, the locking component 4 includes a stop bar 41 and a tension spring 42.

[0035] like Figure 5 As shown, the stop lever 41 is divided into a positive stop lever 411 and a negative stop lever 412, which are symmetrically arranged about the horizontal plane where the central axis of the retaining ring 25 is located, thus improving the self-locking reliability. The head of the stop lever 41 is provided with a through hole and is hinged to the stop lever positioning shaft 23 of the rib connecting piece 2; the tail of the stop lever 41 is provided with a boss, and the boss of the positive stop lever 411 is connected to the boss of the negative stop lever 412 through a tension spring 42. Under normal conditions, the positive and negative stop levers rest on the stop lever limiting shaft 24 under the action of the tension spring 42. During the unfolding of the radial rib 1, the retaining ring 25 moves with the radial rib 1 from the upper end of the arc-shaped limiting groove 22 to the lower end of the arc-shaped limiting groove 22. When the retaining ring 25 contacts the bottom of the stop lever 41, the stop lever is lifted, and the tension spring 42 continues to extend. When the radial rib 1 is unfolded into place, the stop lever 41 abuts against the retaining ring 25 under the tension of the tension spring 42, preventing the radial rib 1 from retracting and sliding in the opposite direction, thereby achieving self-locking.

[0036] The rotation center of the stop lever 41, the contact point between the stop lever 41 and the retaining ring 25, and the center of the retaining ring 25 in the locking assembly 4 must be on the same straight line. This ensures that after the retaining ring 25 passes the stop lever 41, the stop lever 41 can be reset under the tension of the tension spring 42, and will not get stuck in other positions of the retaining ring 25, thus losing its self-locking function.

[0037] The radial rib-type deployable antenna rib connection mechanism with self-locking function described in this invention comprises an inner rib 11 near the antenna center and an outer rib 12 near the annular truss. Both ribs have parabolic surfaces to meet antenna performance requirements. Structurally, the outer end of the inner rib 11 is connected to the inner end of the outer rib 12 via an inter-rib connector 2, while the outer end of the outer rib 12 is hinged to the rib connecting block 5 of the annular truss via a rib truss connector 3. A locking component 4 is fitted onto the inter-rib connector 2 to lock the structure after deployment.

[0038] At the connection between the rib and the annular truss, the rib truss connector 3 plays a crucial supporting and guiding role. It consists of a rectangular piece 31 and a D-shaped piece 32 fixed together. The rectangular piece 31 is firmly installed on the rib connector block 5 of the annular truss by countersunk screws 35. The mounting hole at the lower end of the outer rib 12 fits onto the annular boss of the D-shaped piece 32, and the hinge point is formed by the central axis of the retaining ring 25 and the screw 26. At the same time, the central axis of the retaining ring 25 passes through the arc-shaped limiting groove 33 on the D-shaped piece 32. This arc-shaped limiting groove 33 not only limits the maximum unfolding angle of the radial rib 1, but also defines its unfolding trajectory, ensuring that the rib moves smoothly along the predetermined path without deviation during the unfolding process, thereby ensuring the stability of the unfolding process.

[0039] During the connection and unfolding process within the ribs, the inter-rib connector 2 plays a crucial role. Its overall structure is symmetrical about the central axis, with a positioning hole 21 at the upper end and a quarter-circle arc-shaped limiting groove 22 at the lower end. The central axis of the retaining ring 25 passes through the positioning hole 21 and connects to the upper end of the radial rib 1, while another retaining ring 25 passes through the arc-shaped limiting groove 22 at the lower end and connects to the inner rib 11. The retaining ring 25 slides along the arc-shaped limiting groove 22 only when the antenna is deployed or retracted. The spacing design of the positioning holes 21 ensures that the ribs do not interfere with each other during movement, thus achieving smooth folding and unfolding.

[0040] The self-locking function of the mechanism is achieved by a locking assembly 4 installed on the inter-rib connector 2. This assembly includes a positive stop bar 411 and a negative stop bar 412 connected by a tension spring 42. They are arranged symmetrically about the horizontal plane to improve reliability. In the normal state, the stop bar 41 rests on the stop bar limiting shaft 24 under the tension of the tension spring 42. When the radial rib 1 unfolds, the retaining ring 25 slides downward from the upper end of the arc-shaped limiting groove 22. When the retaining ring 25 contacts the bottom of the stop bar 41, it pushes the stop bar 41 to rotate and lift around the stop bar positioning shaft 23. At this time, the tension spring 42 is further stretched. Once the radial rib 1 is fully unfolded, the retaining ring 25 passes over the stop bar 41. The stop bar 41 then quickly resets under the tension of the tension spring 42 and abuts against the retaining ring 25. This effectively restricts the radial rib 1 from sliding backward and retracting, achieving reliable self-locking. In addition, the design ensures that the rotation center and contact point of the stop bar 41 are on the same straight line as the center of the retaining ring 25, ensuring smooth reset.

[0041] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0042] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0043] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0044] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0045] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0046] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A radial rib type deployable antenna rib connection mechanism with self-locking function, characterized in that, It includes radial ribs (1), inter-rib connectors (2), and locking components (4); The upper end of the inter-rib connector (2) is provided with a positioning hole (21), and the lower end of the inter-rib connector (2) is provided with an arc-shaped limiting groove (22); the radial rib (1) is hinged to the inter-rib connector (2) through a retaining ring (25), and the retaining ring (25) passes through the positioning hole (21) and is slidably set in the arc-shaped limiting groove (22); The locking assembly (4) is installed on the inter-rib connector (2). The locking assembly (4) includes a stop bar (41) and a tension spring (42). One end of the stop bar (41) is hinged to the inter-rib connector (2), and the other end of the stop bar (41) is connected to the tension spring (42). When the radial rib (1) is unfolded into place, the stop bar (41) abuts against the retaining ring (25) under the action of the tension spring (42).

2. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 1, characterized in that, The stop lever (41) includes a positive stop lever (411) and a negative stop lever (412). The positive stop lever (411) and the negative stop lever (412) are symmetrically arranged about the horizontal plane of the central axis of the stop ring (25). The boss on the positive stop lever (411) is connected to the boss on the negative stop lever (412) by a tension spring (42).

3. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 2, characterized in that, The rib connecting piece (2) is provided with a stop rod positioning shaft (23) and a stop rod limiting shaft (24); the head of the stop rod (41) is provided with a through hole and is sleeved on the stop rod positioning shaft (23), and the stop rod (41) rests on the stop rod limiting shaft (24) under the tension of the tension spring (42).

4. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 3, characterized in that, The stop lever positioning shaft (23) and the stop lever limiting shaft (24) are located outside the envelope of the retaining ring (25), and the stop lever positioning shaft (23) and the stop lever limiting shaft (24) are tangent to the envelope of the retaining ring (25).

5. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 1, characterized in that, The arc-shaped limiting groove (22) is a quarter-circle arc groove, and the center of the arc groove is located at the center of the positioning hole (21) at the upper end of the rib connector (2).

6. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 1, characterized in that, The radial rib (1) includes an inner rib (11) and an outer rib (12); the outer end of the inner rib (11) is connected to the inner end of the outer rib (12) through the rib connector (2).

7. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 6, characterized in that, It also includes rib truss connectors (3) and rib connectors (5) of the ring truss; the outer end of the outer rib (12) is hinged to the rib connector (5) through the rib truss connectors (3).

8. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 7, characterized in that, The rib truss connector (3) includes a rectangular piece (31) and a D-shaped piece (32) that are fixed together; the rectangular piece (31) is fixedly installed on the rib connector (5), and the D-shaped piece (32) is arranged along the radial rib (1).

9. The radial rib type deployable antenna rib connection mechanism with self-locking function according to claim 8, characterized in that, The D-shaped part (32) has a cylindrical boss and an arc-shaped limiting groove (33); the mounting hole at the lower end of the outer rib (12) is fitted onto the cylindrical boss, and the retaining ring (25) passes through the arc-shaped limiting groove (33) and connects to the upper end of the outer rib (12).

10. A method for operating the radial rib type deployable antenna rib connection mechanism with self-locking function as described in any one of claims 1-9, characterized in that, Includes the following steps: The radial ribs (1) unfold, causing the retaining ring (25) to slide from the top to the bottom along the arc-shaped limiting groove (22) on the rib connector (2); The retaining ring (25) contacts the bottom of the retaining rod (41) of the locking assembly (4), pushing the retaining rod (41) to rotate and lift around the hinge point, and the tension spring (42) extends accordingly; The radial rib (1) is deployed into place, the retaining ring (25) passes over the retaining rod (41), and the retaining rod (41) is reset under the tension of the tension spring (42); The stop bar (41) abuts against the retaining ring (25), restricting the retaining ring (25) from sliding in the opposite direction along the arc-shaped limiting groove (22), thereby achieving self-locking of the radial rib (1).

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