Regular icosahedron reflector supporting structure capable of being unfolded and folded and supporting method of regular icosahedron reflector supporting structure

Abstract

The invention discloses a foldable regular icosahedron reflector supporting structure which comprises a connector assembly with eight connector types, and all connectors in the connector assembly are connected with a connecting rod assembly through a connecting rod assembly connector assembly with five rod piece types to form a regular icosahedron structure. The invention further discloses a supporting method of the foldable regular icosahedron reflector supporting structure. By means of the supporting structure, the problems that an existing supporting mechanism is driven by a motor, the weight is large, and the driving efficiency is low are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar antennas, and relates to a deployable and retractable support structure for an icosahedral reflector, and the present invention also relates to a support method for a deployable and retractable icosahedral reflector. Background Art

[0002] Radar reflectors can interfere with the detection of enemy radars in the field of radar countermeasures and protect important facilities of one's own side. With the increasingly complex current electromagnetic environment and the rapid development of electronic countermeasures, the current radar reflector technology is difficult to meet the application requirements.

[0003] Most existing radar reflector products use solid metal plates as the reflecting surface, which have the disadvantages of large mass, fixed shape and size, and inability to be folded and unfolded, and it is difficult to meet the requirements of convenient use, convenient transportation and easy loading. At present, a small number of reflector products have the characteristics of structural deployment and retraction and RCS (Radar Cross Section) regulation function, but the deployment and retraction process of the overall system needs to be driven by a motor. In aviation applications and camouflage combat scenarios, using a motor drive will increase the weight of the reflector, and at the same time, there is a problem of low drive efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a deployable and retractable support structure for an icosahedral reflector, which solves the problems of large weight and low drive efficiency existing in the existing support mechanism driven by a motor.

[0005] Another purpose of the present invention is to provide a support method for a deployable and retractable support structure of an icosahedral reflector.

[0006] The first technical solution adopted by the present invention is a deployable and retractable support structure for an icosahedral reflector, which includes a joint assembly containing eight types of joints. Each joint in the joint assembly is connected to a link assembly through a link assembly containing five types of rods to form an icosahedral structure.

[0007] The characteristics of the first technical solution of the present invention also lie in: The joint assembly includes joint I, and joint I includes a joint I main body. The link assembly includes rod I and rope rod II. The joint I main body is connected to two rigid rods I, and the joint I main body is hung with 3 rope rods II through a hanging rope bolt I.

[0008] The joint assembly further includes joint II, and joint II includes two cross-axis universal joints. Each cross-axis universal joint is formed by connecting a joint II main body and an axle fork through a cross-axis and a pin shaft; the link assembly further includes rod III, rod IV and rod V. The joint II main body is respectively connected to two rigid rods III, and the two axle forks are respectively connected to rod IV and rod V.

[0009] The joint assembly further includes Joint III, which includes a main body of Joint III. A rotational pair is formed between the main body of Joint III and the straight sleeve through Bolt IV, and a spherical pair is formed between the main body of Joint III and the ball stud through Bolt III.

[0010] The joint assembly further includes Joint IV, which includes a main body of Joint IV. A rotational pair is formed between the main body of Joint IV and the straight sleeve through Bolt IV, and a spherical pair is formed between the main body of Joint IV and the ball stud through Bolt IV. The main body of Joint IV is fixedly connected to two Rigid Bars III.

[0011] The joint assembly further includes Joint V, which includes two Cardan joints. Each Cardan joint is formed by connecting the main body of Joint V and the yoke through a cross shaft and a pin shaft. A rotational pair is formed between the main body of Joint V and the bent sleeve through Bolt V.

[0012] The joint assembly further includes Joint VI, which includes two Cardan joints. Each Cardan joint is formed by connecting the main body of Joint VI and the yoke through a cross shaft and a pin shaft. A rotational pair is formed between the main body of Joint VI and the bent sleeve through Bolt V.

[0013] The joint assembly further includes Joint VII, which includes a main body of Joint VII. A rotational pair is formed between the main body of Joint VII and the straight sleeve through a bolt, and a spherical pair is formed between the main body of Joint VII and the ball stud through Bolt III. A rotational pair is formed between the main body of Joint VII and the bent sleeve through Bolt V.

[0014] The joint assembly further includes Joint VIII, which includes a main body of Joint VIII. A rotational pair is formed between the main body of Joint VIII and the straight sleeve through Bolt IV, and a spherical pair is formed between the main body of Joint VIII and the ball stud through Bolt III. A rotational pair is formed between the main body of Joint VIII and the bent sleeve through Bolt V; An elastic element is installed between the main body of Joint II and the yoke. Both ends of the elastic element are hung on the double-ear structure of the main body of Joint II, and the middle part of the elastic element is stuck at the stepped shaft where the yoke is connected to Bar V; an elastic element is installed between the main body of Joint V and the bent sleeve. Both ends of the elastic element are hung on the single-ear structure of the main body of the joint, and the middle part of the elastic element is stuck at the stepped shaft where the bent sleeve is connected to Bar I; Joint II, Joint V, and Joint VI are all fixedly connected to five Rigid Bars III to form a pentagonal rigid frame I; Joint IV, Joint VII, and Joint VIII are all fixedly connected to five Rigid Bars III to form a pentagonal rigid frame II.

[0015] The second technical solution adopted by the present invention is a supporting method for a retractable icosahedral reflector support structure, which is in a retracted state when not working, and gradually reaches an extended state under the driving action of an elastic element when working; when in the retracted state, the rope rod II is in a relaxed state; when the external restraining force is released, the elastic element releases strain energy, driving the overall structure to gradually reach an extended state, and when in the extended state, the rope rod II reaches a tensioned state, and the overall structure achieves self-balancing.

[0016] The beneficial effects of the present invention are that the retractable icosahedral reflector support structure provided by the present invention is realized based on a rope-truss combined structure, the overall structure has a high storage rate, and is easy to transport and carry; the overall structure can realize automatic expansion from a folded state to a working state through an elastic element built into a joint, and the support mechanism provided by the present invention is applied to a radar reflector as a support frame of the radar reflector. Since no external input energy is required (i.e., no motor drive is required), the overall weight is relatively light. At the same time, the folding and unfolding of the support frame is realized by the elastic element, and there is no starting process of the motor during the working process. Therefore, when the support structure in the present invention is used for a radar reflector, the efficiency is relatively high when switching between the folded and unfolded states; and since the support structure provided by the present invention does not require a motor drive and is relatively light, the entire device has higher maneuverability and higher adaptability to the application environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the joint assembly structure of the expandable icosahedral reflector support structure of the present invention; Figure 2 It is a schematic diagram of the rod assembly structure of the retractable icosahedral reflector support structure of the present invention; Figure 3 This is a structural diagram of a joint I of a retractable icosahedral reflector support structure of the present invention; Figure 4 This is a structural diagram of the joint II of the retractable icosahedral reflector support structure of the present invention; Figure 5 This is a structural diagram of the joint III of the retractable icosahedral reflector support structure of the present invention; Figure 6 This is a structural diagram of the joint IV of the expandable icosahedral reflector support structure of the present invention; Figure 7 This is a structural diagram of a joint V of a retractable regular icosahedron reflector support structure of the present invention; Figure 8 This is a structural diagram of a joint VI of a retractable icosahedral reflector support structure of the present invention; Figure 9It is the structural diagram of joint VII of the deployable regular icosahedron reflector support structure of the present invention; Figure 10 It is the structural diagram of joint VIII of the deployable regular icosahedron reflector support structure of the present invention; Figure 11 It is the diagram of the built-in elastic element in joint II of the deployable regular icosahedron reflector support structure of the present invention; Figure 12 It is the diagram of the built-in elastic element in joint V of the deployable regular icosahedron reflector support structure of the present invention; Figure 13 It is the model diagram of the retracted state of the deployable regular icosahedron reflector support structure of the present invention; Figure 14 It is the model diagram of the intermediate state of the deployable regular icosahedron reflector support structure of the present invention; Figure 15 It is the model diagram of the deployed state of the deployable regular icosahedron reflector support structure of the present invention.

[0018] In the figure, 1-1. Joint I, 1-2. Joint II, 1-3. Joint III, 1-4. Joint IV, 1-5. Joint V, 1-6. Joint VI, 1-7. Joint VII, 1-8. Joint VIII; 2-1. Rod I, 2-2. Rope rod II, 2-3. Rod III, 2-4. Rod IV, 2-5. Rod V; 3-1. Joint I body, 3-2. Hanging rope bolt I; 4-1. Joint II body, 4-2. Cross shaft, 4-3. Axle fork, 4-4. Pin shaft, 4-5. Hanging rope bolt II; 5-1. Joint III body, 5-2. Straight sleeve, 5-3. Ball head buckle, 5-4. Bolt III, 5-5. Bolt IV; 6-1. Joint IV body; 7-1. Joint V body, 7-2. Bent sleeve, 7-3. Bolt V; 8-1. Joint VI body; 9-1. Joint VII body; 10-1. Joint VIII body. Detailed implementation manner

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0020] The deployable regular icosahedron reflector support structure of the present invention includes a joint assembly and a connecting rod assembly; the joint assembly includes 17 joints, and the 17 joints can be combined into 8 types; the connecting rod assembly includes 35 rods, and the 35 rods can be divided into 5 types.

[0021] Example 1 As Figure 1 shown, the 8 types of joints include joint I1-1, joint II1-2, joint III1-3, joint IV1-4, joint V1-5, joint VI1-6, joint VII1-7, and joint VIII1-8.

[0022] Among them, the number of joint I1-1 is 2; the number of joint II1-2 is 3; the number of joint III1-3 is 5; the number of joint IV1-4 is 3; the number of joint V1-5 is 1; the number of joint VI1-6 is 1; the number of joint VII1-7 is 1; the number of joint VIII1-8 is 1.

[0023] Example 2 As Figure 2 shown, the 5 types of rods include rod I2-1, cable rod II2-2, rod III2-3, rod IV2-4, and rod V2-5.

[0024] Among them, the number of rod I2-1 is 4; the number of cable rod II2-2 is 6; the number of rod III2-3 is 10; the number of rod IV2-4 is 10; the number of rod V2-5 is 5. Rod I2-1, rod III2-3, rod IV2-4, and rod V2-5 are all rigid rods.

[0025] Example 3 As Figure 3 shown, joint I1-1 is composed of joint I main body 3-1 and hanging rope bolt I3-2. Joint I main body 3-1 is fixedly connected to two rigid rods I2-1, and hanging rope bolt I3-2 is used to hang 3 cable rods II2-2.

[0026] Example 4 As Figure 4 shown, joint II1-2 is composed of joint II main body 4-1, cross shaft 4-2, shaft fork 4-3, pin shaft 4-4, and hanging rope bolt II4-5. Joint II1-2 includes two cross shaft universal joints, and each cross shaft universal joint is formed by connecting joint II main body 4-1 and shaft fork 4-3 through cross shaft 4-2 and pin shaft 4-4. Joint II main body 4-1 is used to fixedly connect two rigid rods III2-3, and the two shaft forks 4-3 are respectively used to fixedly connect rigid rod IV2-4 and rod V2-5, and hanging rope bolt II4-5 is used to hang 1 cable rod II2-2.

[0027] Example 5 As Figure 5As shown in the figure, joint III1-3 includes joint III main body 5-1. A rotating pair is formed between joint III main body 5-1 and straight sleeve 5-2 through bolt IV5-5, and a spherical pair is formed between joint III main body 5-1 and ball head buckle 5-3 through bolt III5-4. The other ends of straight sleeve 5-2 and ball head buckle 5-3 are used for fixedly connecting rigid rod IV2-4.

[0028] Embodiment 6 As Figure 6 shown in the figure, joint IV1-4 includes joint IV main body 6-1. A rotating pair is formed between joint IV main body 6-1 and straight sleeve 5-2 through bolt IV5-5, and a spherical pair is formed between joint IV main body 6-1 and ball head buckle 5-3 through bolt IV5-4. The other ends of straight sleeve 5-2 and ball head buckle 5-3 are respectively used for fixedly connecting rigid rod IV2-4 and rod V2-5. Hanging rope bolt II4-5 is used for hanging one rope rod II2-2, and joint IV main body 6-1 is fixedly connected to two rigid rods III2-3.

[0029] Embodiment 7 As Figure 7 shown in the figure, joint V1-5 includes joint V main body 7-1. Joint V1-5 includes two cross-axis universal joints. Each cross-axis universal joint is formed by connecting joint V main body 7-1 and shaft fork 4-3 through cross shaft 4-2 and pin shaft 4-4. A rotating pair is formed between joint V main body 7-1 and bent sleeve 7-2 through bolt V7-3. Joint V main body 7-1 is used for fixedly connecting two rigid rods III2-3. The two shaft forks 4-3 are respectively used for fixedly connecting rigid rod IV2-4 and rod V2-5. The other end of bent sleeve 7-2 is used for fixedly connecting rigid rod I2-1.

[0030] Embodiment 8 As Figure 8 shown in the figure, joint VI1-6 includes joint VI main body 8-1. Joint VI1-6 includes two cross-axis universal joints. Each cross-axis universal joint is formed by connecting joint VI main body 8-1 and shaft fork 4-3 through cross shaft 4-2 and pin shaft 4-4. A rotating pair is formed between joint VI main body 8-1 and bent sleeve 7-2 through bolt V7-3. Joint VI main body 8-1 is used for fixedly connecting two rigid rods III2-3. The two shaft forks 4-3 are respectively used for fixedly connecting rigid rod IV2-4 and rod V2-5. The other end of bent sleeve 7-2 is used for fixedly connecting rigid rod I2-1.

[0031] Embodiment 9 As Figure 9As shown, the joint VII 1-7 includes the joint VII body 9-1. A rotational pair is formed between the joint VII body 9-1 and the straight sleeve 5-2 by bolts 5-5. A spherical pair is formed between the joint VII body 9-1 and the ball head buckle 5-3 by bolts III 5-4. A rotational pair is formed between the joint VII body 9-1 and the bent sleeve 7-2 by bolts V 7-3. The other ends of the straight sleeve 5-2 and the ball head buckle 5-3 are respectively used for fixedly connecting the rigid rod IV 2-4 and the rod V 2-5. The joint VII body 9-1 is fixedly connected to two rigid rods III 2-3. The other end of the bent sleeve 7-2 is used for fixedly connecting the rigid rod I 2-1.

[0032] Embodiment 10 As Figure 10 shown, the joint VIII 1-8 includes the joint VIII body 10-1. A rotational pair is formed between the joint VIII body 10-1 and the straight sleeve 5-2 by bolts IV 5-5. A spherical pair is formed between the joint VIII body 10-1 and the ball head buckle 5-3 by bolts III 5-4. A rotational pair is formed between the joint VIII body 10-1 and the bent sleeve 7-2 by bolts V 7-3. The other ends of the straight sleeve 5-2 and the ball head buckle 5-3 are respectively used for fixedly connecting the rigid rod IV 2-4 and the rod V 2-5. The joint VIII body 10-1 is fixedly connected to two rigid rods III 2-3. The other end of the bent sleeve 7-2 is used for fixedly connecting the rigid rod I 2-1.

[0033] Embodiment 11 As Figure 11 、 12 shown, an elastic element (such as a rubber band or a tension spring) is installed between the joint II body 4-1 and the shaft fork 4-3 of the joint II 1-2. The two ends of the elastic element are hung on the double-ear structure of the joint II body 4-1, and the middle part of the elastic element is stuck at the stepped shaft where the shaft fork 4-3 is connected to the rod V 2-5. An elastic element is installed between the joint V body 7-1 and the bent sleeve 7-2 of the joint V 1-5. The two ends of the elastic element are hung on the single-ear structure of the joint body 7-1, and the middle part of the elastic element is stuck at the stepped shaft where the bent sleeve 7-2 is connected to the rod I 2-1. An elastic element is also installed in the joint IV 1-4, and the installation method is the same as that of the joint II 1-2; elastic elements are also installed in the joint VI 1-6, the joint VII 1-7, and the joint VIII 1-8, and the installation methods are the same as that of the joint V 1-5.

[0034] There are fixed connections between Connector II 1-2, Connector V 1-5, Connector VI 1-6 and five rigid bars III 2-3, forming a pentagonal rigid frame I; there are fixed connections between Connector IV 1-4, Connector VII 1-7, Connector VIII 1-8 and five rigid bars III 2-3, forming a pentagonal rigid frame II; Connector V 1-5 and Connector VI 1-6 are respectively connected to the rigid bar I 2-1 to form revolute pairs, and Connector VII 1-7 and Connector VIII 1-8 are respectively connected to the rigid bar I 2-1 to form revolute pairs; there are universal joint pairs between each bar V 2-5 and the connectors of the pentagonal rigid frame I, and there are spherical pairs between each bar V 2-5 and the connectors of the pentagonal rigid frame II; there are universal joint pairs between each bar IV 2-4 and the connectors of the pentagonal rigid frame I, and there are revolute pairs between each bar IV 2-4 and the connectors of the pentagonal rigid frame II; spherical pairs and revolute pairs are respectively formed between the two ends of Connector III 1-3 and each bar IV 2-4.

[0035] Embodiment 12 As Figures 13 - 15 shown, the deployable icosahedral reflector support structure has multiple states of retraction - middle - deployment. When not working, it is in the retracted state, and when working, it gradually reaches the deployed state under the driving action of elastic elements. When in the retracted state, the cable bar II 2-2 is in a relaxed state, Figure 11 , 12 the elastic elements shown are in the tensile energy storage state. At this time, it is necessary to maintain the balance state of retraction under the action of external binding forces; when the external binding forces are released, the elastic elements in Connector II 1-2 release strain energy, driving the bars IV 2-4 and bar V 2-5 to make spatial rotational motions relative to the cross-axis universal joints in the pentagonal rigid frame I; the elastic elements in Connector IV 1-4 release strain energy, driving the bars IV 2-4 and bar V 2-5 to make spatial rotational motions relative to the cross-axis universal joints in the pentagonal rigid frame II; the elastic elements in Connector V 1-5 and Connector VI 1-6 release strain energy, driving the bar I 2-1 to make spatial rotational motions relative to the revolute pairs in the pentagonal rigid frame I; the elastic elements in Connector VII 1-7 and Connector VII 1-8 release strain energy, driving the bar I 2-1 to make spatial rotational motions relative to the revolute pairs in the pentagonal rigid frame II; under the combined driving action of each elastic element, the overall structure gradually reaches the deployed state. When the structure is fully deployed, the cable bar II 2-2 reaches the tensioned state, and the overall structure achieves self - balance.

[0036] Embodiment 13 The deployable and retractable icosahedron reflector support structure of the present invention has an edge length of the icosahedron of 0.2 m. The lengths of rod I2-1, cable rod II2-2, rod III2-3, rod IV2-4, and rod V2-5 are 0.179 m, 0.188 m, 0.192 m, 0.076 m, and 0.168 m respectively. The rigid rod materials are all made of carbon fiber materials, the cable rods are all made of Kevlar ropes, and the joints are all made of high-performance nylon materials. Bolts and pins are standard parts and Q235 steel is selected. The cross-section of the rigid rod is a hollow circular tube with an inner diameter of 1 mm and an outer diameter of 2 mm. The cross-section of the cable rod is a solid circle with a diameter of 1 mm. The models of the overall structure in the retracted state and the deployed state are as shown in Figure 13 , 15 . The deployment diameter of the overall model in the deployed state is 0.365 m, the deployment height is 0.365 m, and the deployment volume is 0.0255 m 3 . The retraction diameter of the overall model in the retracted state is 0.365 m, the retraction height is 0.036 m, and the retraction volume is 0.0038 m 3 . It can be seen that the retraction height and retraction volume of the deployable and retractable icosahedron reflector support structure of the present invention are respectively reduced by 90.14% and 85.10% compared with the deployed state. The performance parameters of the deployable and retractable icosahedron reflector support structure of the present invention are shown in Table 1 below: Table 1

Claims

1. A deployable and retractable regular icosahedron reflector support structure, characterized in that: It includes a joint assembly containing eight types of joints. Each joint in the joint assembly is connected by a connecting rod assembly containing five types of rods. After the joint assembly and the connecting rod assembly are connected, an icosahedron structure is formed.

2. The deployable and retractable regular icosahedron reflector support structure according to claim 1, wherein: The joint assembly includes Joint I (1-1). Joint I (1-1) includes a Joint I main body (3-1). The connecting rod assembly includes Rod I (2-1) and cable Rod II (2-2). The Joint I main body (3-1) is connected to two rigid Rods I (2-1). The Joint I main body (3-1) hangs 3 cable Rods II (2-2) through a hanging rope bolt I (3-2).

3. The deployable and retractable regular icosahedron reflector support structure according to claim 2, characterized in that: The joint assembly further includes Joint II (1-2). Joint II (1-2) includes two cardan joints. Each cardan joint is formed by connecting a Joint II main body (4-1) and a yoke (4-3) through a cross shaft (4-2) and a pin shaft (4-4). The connecting rod assembly further includes Rod III (2-3), Rod IV (2-4) and Rod V (2-5). The Joint II main body (4-1) is respectively connected to two rigid Rods III (2-3), and the two yokes (4-3) are respectively connected to Rod IV (2-4) and Rod V (2-5).

4. The deployable and retractable regular icosahedron reflector support structure according to claim 3, characterized in that: The joint assembly further includes Joint III (1-3). Joint III (1-3) includes a Joint III main body (5-1). A revolute pair is formed between the Joint III main body (5-1) and a straight sleeve (5-2) through a bolt IV (5-5), and a spherical pair is formed between the Joint III main body (5-1) and a ball stud (5-3) through a bolt III (5-4).

5. The deployable and retractable icosahedral reflector support structure according to claim 4, characterized in that: The joint assembly further includes Joint IV (1-4). Joint IV (1-4) includes a Joint IV main body (6-1). A revolute pair is formed between the Joint IV main body (6-1) and a straight sleeve (5-2) through a bolt IV (5-5), and a spherical pair is formed between the Joint IV main body (6-1) and a ball stud (5-3) through a bolt IV (5-4). The Joint IV main body (6-1) is fixedly connected to two rigid Rods III (2-3).

6. The deployable and retractable icosahedral reflector support structure according to claim 5, characterized in that: The joint assembly further includes Joint V (1-5). Joint V (1-5) includes two cardan joints. Each cardan joint is formed by connecting a Joint V main body (7-1) and a yoke (4-3) through a cross shaft (4-2) and a pin shaft (4-4). A revolute pair is formed between the Joint V main body (7-1) and a bent sleeve (7-2) through a bolt V (7-3).

7. The deployable and retractable regular icosahedron reflector support structure according to claim 6, characterized in that: The joint assembly further includes Joint VI (1-6). Joint VI (1-6) includes two cardan joints. Each cardan joint is formed by connecting a Joint VI main body (8-1) and a yoke (4-3) through a cross shaft (4-2) and a pin shaft (4-4). A revolute pair is formed between the Joint VI main body (8-1) and a bent sleeve (7-2) through a bolt V (7-3).

8. The deployable and retractable regular icosahedron reflector support structure according to claim 7, characterized in that: The joint assembly further includes joint VII (1-7). Joint VII (1-7) includes a joint VII body (9-1). A revolute pair is formed between the joint VII body (9-1) and the straight sleeve (5-2) through a bolt (5-5). A spherical pair is formed between the joint VII body (9-1) and the ball catch (5-3) through bolt III (5-4). A revolute pair is formed between the joint VII body (9-1) and the bent sleeve (7-2) through bolt V (7-3).

9. The deployable icosahedral reflector support structure according to claim 8, wherein: The joint assembly further includes joint VIII (1-8). Joint VIII (1-8) includes a joint VIII body (10-1). A revolute pair is formed between the joint VIII body (10-1) and the straight sleeve (5-2) through bolt IV (5-5). A spherical pair is formed between the joint VIII body (10-1) and the ball catch (5-3) through bolt III (5-4). A revolute pair is formed between the joint VIII body (10-1) and the bent sleeve (7-2) through bolt V (7-3). An elastic element is installed between the joint II body (4-1) and the shaft fork (4-3). Both ends of the elastic element are hung on the double lug structure of the joint II body (4-1), and the middle part of the elastic element is stuck at the stepped shaft where the shaft fork (4-3) is connected to the rod V (2-5). An elastic element is installed between the joint V body (7-1) and the bent sleeve (7-2). Both ends of the elastic element are hung on the single lug structure of the joint body (7-1), and the middle part of the elastic element is stuck at the stepped shaft where the bent sleeve (7-2) is connected to the rod I (2-1). Joint II (1-2), joint V (1-5), joint VI (1-6) and the five rigid rods III (2-3) are fixedly connected to form a pentagonal rigid frame I. Joint IV (1-4), joint VII (1-7), joint VIII (1-8) and the five rigid rods III (2-3) are fixedly connected to form a pentagonal rigid frame II.

10. A supporting method for a deployable and retractable support structure of an icosahedral reflector, characterized in that: When not working, it is in a retracted state. When working, it gradually reaches the deployed state under the driving action of the elastic element. When in the retracted state, the cable rod II (2-2) is in a relaxed state. When the external constraint force is released, the elastic element releases strain energy and drives the overall structure to gradually reach the deployed state. When in the deployed state, the cable rod II (2-2) reaches the tensioned state and the overall structure achieves self-balancing.

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