Secondary expandable pneumatic speed reducer

Abstract

The invention discloses a secondary deployable pneumatic speed reducer which comprises a main body unit, a rigid deployable unit, a driving unit and a skin, a deployable assembly comprises a first spoke, a second spoke and a connecting rod, and the driving unit comprises a driving sleeve, a driver and a tensioning cable. The unfolding process comprises a first unfolding stage and a second unfolding stage, in the first unfolding stage, the driver pulls the tensioning cable to drive the second spokes to slide relative to the first spokes, and complete unfolding of the second spokes is achieved; and in the second unfolding stage, the driving sleeve is driven by the tensioning cable to slide upwards along the axis of the supporting body, the first spokes and the second spokes are driven by the connecting rods to rotate relative to the supporting body, the skin is driven to be completely unfolded, and complete unfolding of the pneumatic speed reduction face of the pneumatic speed reducer is achieved. The elongation of the tensioning cable is increased along with the increase of the external aerodynamic load and the elastic force of the flexible skin, and self-adaptive adjustment of the flexural rigidity and the unfolding angle of the deployable assembly along with the change of the external aerodynamic load can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic reducers, and in particular to a secondary deployable pneumatic reducer. Background Art

[0002] In the field of planetary landing exploration, the secondary deployable pneumatic reducer can realize the folding and unfolding of the spokes, greatly increasing the aerodynamic deceleration area while reducing the folded volume. During the aerodynamic deceleration process of the deployable pneumatic reducer, the complex external aerodynamic load acts on the semi-rigid aerodynamic deceleration surface composed of rigid spokes and flexible skin. The rigid spokes are prone to bending and deformation, affecting the deceleration effect. Summary of the invention

[0003] The purpose of the present invention is to provide a secondary deployable pneumatic reducer to solve the problems existing in the above-mentioned related technologies, improve the stability of the deceleration effect of the pneumatic reducer, and effectively protect the stressed components.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a secondary deployable pneumatic reducer, comprising:

[0006] A main body unit, the main body unit comprising a supporting body;

[0007] A rigid expandable unit, the rigid expandable unit comprising a plurality of expandable components, the expandable components comprising a first spoke, a second spoke and a connecting rod, one end of the first spoke being hinged to the top of the support body, and the hinge axis of the two being perpendicular to the axis of the support body, the other end of the first spoke being slidably connected to one end of the second spoke, one end of the connecting rod being hinged to one end of the second spoke close to the first spoke, and the hinge axis of the two being perpendicular to the axis of the support body; the expandable components being uniformly distributed circumferentially around the axis of the support body;

[0008] A driving unit, the driving unit comprising a driving sleeve, a driver and a tensioning cable, the driving sleeve being slidably sleeved on the outside of the supporting body, the sliding direction of the driving sleeve being parallel to the axis of the supporting body, the driving sleeve being located below the deployable component, the end of the connecting rod away from the second spoke being hinged to the top of the driving sleeve, and the hinge axis of the two being perpendicular to the axis of the supporting body, the driver being connected to the supporting body, one end of the tensioning cable being connected to the driver, and the other end of the tensioning cable being connected to the hinge of the first spoke and the connecting rod after passing around the bottom of the driving sleeve; the tensioning cable being made of elastic material, and the tensioning cable corresponding to the deployable component one by one;

[0009] The skin is made of a flexible material and is laid on the deployable component. The deployment of the deployable component can drive the skin to deploy.

[0010] Preferably, the second spoke is slidably mounted on the outside of the first spoke.

[0011] Preferably, the cross-sections of the first spoke and the second spoke are both rectangular, and a block is provided between the first spoke and the second spoke to limit the sliding limit position of the second spoke.

[0012] Preferably, the first spoke is hinged to the support body by a first pin seat, the first pin seat is connected to the support body, the connecting rod is hinged to the second spoke by a second pin seat, the second pin seat is connected to the second spoke, the connecting rod is hinged to the drive sleeve by a third pin seat, and the third pin seat is connected to the drive sleeve;

[0013] A side of the third pin seat close to the support body is an arc surface matching the outer peripheral surface of the support body.

[0014] Preferably, a fixed pulley is provided at the bottom of the driving sleeve, and the fixed pulley is rotatably connected to the driving sleeve, and the rotation axis of the fixed pulley is perpendicular to the axis of the supporting body. The tensioning cable is connected to the second pin shaft seat after passing around the fixed pulley, and the fixed pulley corresponds to the tensioning cable one by one.

[0015] Preferably, the drive sleeve comprises a support rod and two drive rings, the two drive rings are arranged in parallel along the axial direction of the support body, the support rod connects the two drive rings, there are multiple support rods, and the support rods are evenly distributed circumferentially around the axis of the support body.

[0016] Preferably, the third pin seat is arranged on the upper driving ring, and the side of the third pin seat close to the supporting body has a first passing groove allowing the tensioning cable to pass through, and the inner side wall of the driving ring has a second passing groove allowing the tensioning cable to pass through, and the first passing groove and the second passing groove are both U-shaped grooves with their opening direction facing the axial direction of the supporting body.

[0017] Preferably, the main body unit further comprises a top reinforcement layer, a bottom reinforcement layer and a heat protection head cone, wherein the top reinforcement layer is arranged at the top of the support body, the bottom reinforcement layer is arranged at the bottom of the support body, and the heat protection head cone is arranged on the top reinforcement layer;

[0018] The bottom reinforcing layer has a third through groove capable of accommodating the fixed pulley, and the third through groove is a U-shaped groove with an opening facing away from the axis direction of the supporting body.

[0019] Preferably, the driver is built in the supporting body, and a through hole adapted to the tensioning cable is provided on a side wall of the supporting body, and one end of the tensioning cable passes through the through hole and is connected to the driver.

[0020] Preferably, a restraining element is provided between the driving sleeve and the supporting body, and the restraining element can fix the relative position between the driving sleeve and the supporting body.

[0021] Compared with the related art, the present invention has achieved the following technical effects: the secondary deployable pneumatic reducer of the present invention includes a main body unit, a rigid deployable unit, a drive unit and a skin, the main body unit includes a support body; the rigid deployable unit includes a plurality of deployable components, the deployable components include a first spoke, a second spoke and a connecting rod, one end of the first spoke is hinged to the top of the support body, and the hinge axis of the two is perpendicular to the axis of the support body, the other end of the first spoke is slidably connected to one end of the second spoke, one end of the connecting rod is hinged to one end of the second spoke close to the first spoke, and the hinge axis of the two is perpendicular to the axis of the support body; the deployable components are circumferentially evenly distributed around the axis of the support body; the drive unit It includes a driving sleeve, a driver and a tensioning cable. The driving sleeve can be slidably mounted on the outside of the supporting body. The sliding direction of the driving sleeve is parallel to the axis of the supporting body. The driving sleeve is located below the deployable component. The end of the connecting rod away from the second spoke is hinged to the top of the driving sleeve, and the hinge axis of the two is perpendicular to the axis of the supporting body. The driver is connected to the supporting body, one end of the tensioning cable is connected to the driver, and the other end of the tensioning cable is connected to the hinge between the first spoke and the connecting rod after passing through the bottom of the driving sleeve; the tensioning cable is made of elastic material, and the tensioning cable corresponds to the deployable component one by one; the skin is made of flexible material, and the skin is laid on the deployable component. The extension of the deployable component can drive the skin to unfold.

[0022] The secondary deployable pneumatic reducer of the present invention comprises a first deployment stage and a second deployment stage in the deployment process. In the first deployment stage, the driver pulls the tensioning cable to drive the second spoke to slide relative to the first spoke to achieve full deployment of the second spoke. In the second deployment stage, the driving sleeve slides upward along the axis of the supporting body under the drive of the tensioning cable, and the connecting rod is used to drive the first spoke and the second spoke to rotate relative to the supporting body, so as to drive the skin to fully deploy, thereby achieving full deployment of the pneumatic deceleration surface of the pneumatic reducer. After the pneumatic reducer is fully deployed, the pre-tensioned state is maintained under the joint action of the tensioning cable, the flexible skin and the pneumatic load, and the first spoke and the second spoke are locked by motion constraints. The tensioning cable is elastic, and the elongation of the tensioning cable increases with the increase of the external pneumatic load and the elastic force of the flexible skin, so that the bending stiffness and the deployment angle of the deployable component increase and decrease respectively with the increase of the external pneumatic load, and the bending stiffness and the deployment angle of the deployable component can be adaptively adjusted with the change of the external pneumatic load, thereby improving the stability of the pneumatic deceleration effect and effectively protecting the stressed components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention when deployed;

[0025] Figure 2 It is a schematic structural diagram of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention when it is folded;

[0026] Figure 3 It is a structural schematic diagram of a rigid deployable unit of a secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the third pin shaft seat of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0028] Figure 5 It is a structural schematic diagram of a driving sleeve of a secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0029] Figure 6 It is a schematic structural diagram of a driving ring of a secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0030] Figure 7It is a structural schematic diagram of the supporting body of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0031] Figure 8 for Figure 7 Schematic diagram of the section along the AA direction;

[0032] Fig. 9 It is a cross-sectional schematic diagram of a partial structure of a rigid deployable unit of a secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0033] Fig.10 It is a schematic diagram of the principle of pre-tensioning and stiffness adaptation of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention.

[0034] In the figure: 100, secondary deployable pneumatic reducer;

[0035] 1. Rigid deployable unit; 2. Skin; 3. Tensioning cable; 4. Main unit; 5. Driving sleeve; 6. Heat-proof head cone; 7. First pin seat; 8. First spoke; 9. Second spoke; 10. Second pin seat; 11. Connecting rod; 12. Third pin seat; 13. First through groove; 14. Arc surface; 15. Second through groove; 16. Driving ring; 17. Support rod; 18. Fixed pulley; 19. Support body; 20. Top reinforcement layer; 21. Through hole; 22. Third through groove; 23. Constraint element; 24. Bottom reinforcement layer; 25. Driver. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The purpose of the present invention is to provide a secondary deployable pneumatic reducer to solve the problems existing in the above-mentioned related technologies, improve the stability of the deceleration effect of the pneumatic reducer, and effectively protect the stressed components.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1

[0040] The present invention provides a secondary deployable pneumatic reducer 100, please refer to Figure 1-Figure 10, including a main unit 4, a rigid deployable unit 1, a drive unit and a skin 2, the main unit 4 includes a support body 19; the rigid deployable unit 1 includes a plurality of deployable components, the deployable components include a first spoke 8, a second spoke 9 and a connecting rod 11, one end of the first spoke 8 is hinged to the top of the support body 19, and the hinge axis of the two is perpendicular to the axis of the support body 19, the other end of the first spoke 8 is slidably connected to one end of the second spoke 9, one end of the connecting rod 11 is hinged to one end of the second spoke 9 close to the first spoke 8, and the hinge axis of the two is perpendicular to the axis of the support body 19; the deployable components are uniformly distributed around the axis of the support body 19; the drive unit includes a drive sleeve 5, a driver 25 and a tensioning cable 3, the drive The sleeve 5 is slidably mounted on the outside of the support body 19, and the sliding direction of the drive sleeve 5 is parallel to the axis of the support body 19. The drive sleeve 5 is located below the deployable component. The end of the connecting rod 11 away from the second spoke 9 is hinged to the top of the drive sleeve 5, and the hinge axis of the two is perpendicular to the axis of the support body 19. The driver 25 is connected to the support body 19, one end of the tensioning cable 3 is connected to the driver 25, and the other end of the tensioning cable 3 is connected to the hinge between the first spoke 8 and the connecting rod 11 after bypassing the bottom of the drive sleeve 5; the tensioning cable 3 is made of elastic material, and the tensioning cable 3 corresponds to the deployable component one by one; the skin 2 is made of flexible material, and the skin 2 is laid on the deployable component. The extension of the deployable component can drive the skin 2 to unfold.

[0041] The secondary deployable pneumatic reducer 100 of the present invention has a deployment process including a first deployment stage and a second deployment stage. In the first deployment stage, the driver 25 pulls the tensioning cable 3 to drive the second spoke 9 to slide relative to the first spoke 8, thereby achieving full deployment of the second spoke 9. In the second deployment stage, the drive sleeve 5 slides upward along the axis of the support body 19 under the drive of the tensioning cable 3, and uses the connecting rod 11 to drive the first spoke 8 and the second spoke 9 to rotate relative to the support body 19, thereby driving the skin 2 to fully deploy, thereby achieving full deployment of the pneumatic deceleration surface of the pneumatic reducer. After the pneumatic reducer is fully deployed, the pre-tensioned state is maintained under the joint action of the tensioning cable 3, the flexible skin 2 and the pneumatic load, and the first spoke 8 and the second spoke 9 are locked by motion constraints. The tensioning cable 3 is elastic, and the elongation of the tensioning cable 3 increases with the increase of the external aerodynamic load and the elastic force of the flexible skin 2, so that the bending stiffness and the deployment angle of the deployable component increase and decrease respectively with the increase of the external aerodynamic load, and the bending stiffness and the deployment angle of the deployable component can be adaptively adjusted with the change of the external aerodynamic load, thereby improving the stability of the aerodynamic deceleration effect and effectively protecting the stressed components. The secondary deployable pneumatic reducer 100 of the present invention greatly increases the aerodynamic deceleration surface by secondary folding and unfolding, and can reduce the folded volume and axial size of the overall structure when folded, which is conducive to improving the adaptability of the pneumatic reducer.

[0042] The second spoke 9 is slidably mounted on the outside of the first spoke 8, so as to ensure that the second spoke 9 can slide smoothly along the first spoke 8, and can also reduce the space occupied by the structure when folded and collected.

[0043] In this specific embodiment, the cross-sections of the first spoke 8 and the second spoke 9 are both rectangular. On the basis of ensuring the smooth reciprocating sliding of the second spoke 9, the relative rotation of the first spoke 8 and the second spoke 9 is avoided to cause misalignment, thereby improving the movement accuracy of the second spoke 9. In other specific embodiments that can be realized by the present invention, the cross-sectional shapes of the first spoke 8 and the second spoke 9 can also be triangular or other polygonal, special-shaped, etc. It should also be noted that a block is provided between the first spoke 8 and the second spoke 9 to limit the sliding limit position of the second spoke 9, to avoid the second spoke 9 and the first spoke 8 from slipping off, and to improve the structural stability and movement reliability of the deployment assembly.

[0044] Specifically, the first spoke 8 is hinged to the support body 19 by using the first pin seat 7, the first pin seat 7 is connected to the support body 19, the connecting rod 11 is hinged to the second spoke 9 by using the second pin seat 10, the second pin seat 10 is connected to the second spoke 9, the connecting rod 11 is hinged to the drive sleeve 5 by using the third pin seat 12, the third pin seat 12 is connected to the drive sleeve 5, and the pin seat is used to improve the stability of the articulated connection.

[0045] It should also be noted that the side of the third pin seat 12 close to the support body 19 is an arc surface 14 that matches the outer peripheral surface of the support body 19, so as to prevent the third pin seat 12 from affecting the reciprocating sliding of the drive sleeve 5, and at the same time increase the contact area between the third pin seat 12 and the support body 19, so that the third pin seat 12 can better bear the external aerodynamic load transmitted by the connecting rod 11 and significantly improve the smoothness of its own movement.

[0046] It should also be emphasized that a fixed pulley 18 is provided at the bottom of the driving sleeve 5, and the fixed pulley 18 is rotatably connected to the driving sleeve 5, and the rotation axis of the fixed pulley 18 is perpendicular to the axis of the supporting body 19. The tensioning cable 3 is connected to the second pin shaft seat 10 after passing around the fixed pulley 18, and the fixed pulley 18 corresponds to the tensioning cable 3 one by one. The driving sleeve 5 can ensure the synchronous deployment of multiple groups of deployable components. The fixed pulley 18 is provided at the bottom of the driving sleeve 5 to change the force direction of the tensioning cable 3, and ensure the deployment reliability of the pneumatic reducer on the basis of saving the space occupied by the device.

[0047] More specifically, the drive sleeve 5 includes a support rod 17 and two drive rings 16. The two drive rings 16 are arranged in parallel along the axis direction of the support body 19. The support rod 17 connects the two drive rings 16. There are multiple support rods 17. The support rods 17 are evenly distributed around the axis of the support body 19, which improves the uniform force of the drive rings 16, ensures the smoothness of the reciprocating sliding of the drive sleeve 5 along the support body 19, and improves the structural stability of the pneumatic reducer. In this specific embodiment, the mass centers of the third pin shaft seat 12, the support rod 17 and the fixed pulley 18 are collinear, so that the external aerodynamic load acting on the third pin shaft seat 12 and the elastic force of the tensioning cable 3 acting on the fixed pulley 18 are concentrated on the support rod 17 with good compressive performance, thereby improving the bearing capacity of the drive sleeve 5.

[0048] In addition, the third pin seat 12 is arranged on the upper driving ring 16, the trapezoidal bottom surface of the third pin seat 12 is connected to the driving ring 16, and the side of the third pin seat 12 close to the supporting body 19 has a first passing groove 13 allowing the tensioning cable 3 to pass through, and the inner wall of the driving ring 16 has a second passing groove 15 allowing the tensioning cable 3 to pass through. The first passing groove 13 and the second passing groove 15 are both U-shaped grooves with the opening direction facing the axial direction of the supporting body 19. The side lengths of the first passing groove 13 and the second passing groove 15 are both larger than the diameter of the tensioning cable 3, providing movement space for the tensioning cable 3 to avoid affecting the normal work of the tensioning cable 3.

[0049] Furthermore, the main unit 4 also includes a top reinforcement layer 20, a bottom reinforcement layer 24 and a heat-proof head cone 6. The top reinforcement layer 20 is arranged at the top of the support body 19, and the bottom reinforcement layer 24 is arranged at the bottom of the support body 19 to enhance the overall rigidity of the main unit 4. The heat-proof head cone 6 is arranged on the top reinforcement layer 20 to ensure the structural strength of the main unit 4.

[0050] Correspondingly, the bottom reinforcement layer 24 has a third through groove 22 capable of accommodating the fixed pulley 18, and the third through groove 22 is a U-shaped groove with an opening facing away from the axis direction of the support body 19. When the secondary deployable pneumatic reducer 100 of the present invention is in a folded state, the bottom surface of the driving ring 16 below the driving sleeve 5 is in contact with the upper surface of the bottom reinforcement layer 24, and the fixed pulley 18 is located in the third through groove 22.

[0051] In this specific embodiment, the support body 19 is a hollow structure, and the hollow internal space provides sufficient carrying volume for the effective load. The driver 25 is built into the support body 19 to save space. The side wall of the support body 19 has a through hole 21 adapted to the tensioning cable 3. One end of the tensioning cable 3 passes through the through hole 21 and enters the support body 19 and is connected to the driver 25. In this specific embodiment, the driver 25 is an electric motor.

[0052] Furthermore, a constraint element 23 is provided between the drive sleeve 5 and the support body 19, and the constraint element 23 can fix the relative position between the drive sleeve 5 and the support body 19. In this specific embodiment, the number of the constraint elements 23 is multiple, and the constraint element 23 is provided in the third through groove 22. In the secondary deployable pneumatic reducer 100 of the present invention, in the first deployment stage, the constraint element 23 locks the drive sleeve 5, and the driver 25 pulls the tensioning cable 3 to drive the second spoke 9 to slide along the axis direction of the first spoke 8, so as to achieve full extension of the second spoke 9. After the second spoke 9 is fully extended, the first spoke 8 and the second spoke 9 are locked by motion constraint under the joint action of the tensioning cable 3 and the constraint element 23; then the constraint element 23 is controlled to release the constraint between the drive sleeve 5 and the support body 19, and the drive sleeve 5 is driven by the tensioning cable 3 to translate upward along the axis of the support body 19, driving the locked first spoke 8 and the second spoke 9 to rotate around the rotation axis of the first pin shaft seat 7, so as to achieve full deployment of the pneumatic deceleration surface.

[0053] Combine the following Fig.10 The working principle of the secondary deployable pneumatic reducer 100 of the present invention is explained in detail. The external pneumatic load p(x) acts on the first spoke 8AC and the second spoke 9BC, and is transmitted to the support body 19 and the drive sleeve 5 through the connecting rod 11CD and the third pin seat 12D. When the external aerodynamic load p(x) increases, the first spoke 8AC and the second spoke 9BC will inevitably bend and deform, wherein the bending deformation of the first spoke 8AC will cause the distance between the first pin seat 7A and the second pin seat 10C to shorten, driving the connecting rod 11CD to rotate around the third pin seat 12D, reducing the expansion angle β of the connecting rod 11CD. According to the cosine theorem, it can be obtained that the length of the tensioning cable 3CF segment increases with the decrease of the expansion angle β of the connecting rod 11. According to Hu Ke's law, it can be obtained that the elastic force T also increases with the decrease of the expansion angle β of the connecting rod 11. The increased elastic force T can drive the expansion angle β of the connecting rod 11 to increase, inhibit the rotation of the connecting rod 11 driven by the bending deformation of the first spoke 8AC, and thereby reduce the bending deformation of the first spoke 8AC, thereby achieving the adaptive enhancement of the bending stiffness of the first spoke 8AC as the aerodynamic load increases.

[0054] In this specific embodiment, Fig.10As shown, when the external aerodynamic load p(x) acting on the first spoke 8AC and the second spoke 9BC increases significantly, the axial force FCD of the connecting rod 11 also increases significantly, the initial pre-tensioning state of the pneumatic reducer is broken, and the driving sleeve 5DF moves vertically downward along the axis l' direction of the support body 19 under the action of the axial force FCD of the connecting rod 11, driving the first spoke 8AC, the second spoke 9BC and the connecting rod 11CD to make planar motion, so that the expansion angle α of the first spoke 8, the expansion angle β of the connecting rod 11 and the angle γ between the tensioning cable 3CFEHCF segment and the axis of the support body 19 are all reduced. The reduction in the expansion angle α of the first spoke 8 reduces the tangential component of the aerodynamic load acting on the first spoke 8AC and the second spoke 9BC, thereby reducing the bending moment exerted on the first spoke 8AC and the second spoke 9BC; in the above process, the translation of the drive sleeve 5DF increases the length of the tensioning cable 3EF segment, the fixed-axis rotation of the connecting rod 11DF increases the length of the tensioning cable 3CF segment, and the planar movement of the drive sleeve 5DF and the connecting rod 11CD increases the elongation of the tensioning cable 3CFEH to a greater extent, and the component of the combined elastic force of the tensioning cable 3CFEH in the vertical upward direction along the axis of the support body 19 also increases, until the pneumatic reducer as a whole maintains a new equilibrium state under the action of the increased external aerodynamic load p(x) and the increased elastic force T of the tensioning cable 3CFEH. After the pneumatic reducer as a whole also reaches a new pre-tensioned state, the increased elastic force T can more effectively suppress the bending deformation of the first spoke 8AC. When the external aerodynamic load p(x) acting on the first spoke 8AC and the second spoke 9BC is greatly reduced, the axial force FCD of the connecting rod 11 is also greatly reduced, and the pre-tensioned state of the pneumatic reducer is broken again. The driving sleeve 5DF is vertically translated upward along the axis l' direction of the supporting body 19 under the action of the elastic force T of the tensioning cable 3CFEH, driving the rigid deployable unit 1 to do planar motion. The elastic force T of the tensioning cable 3CFEH is reduced to maintain a new equilibrium state with the reduced external aerodynamic load p(x), so that the tangential component of the aerodynamic load acting on the spokes increases. In this process, the expansion angle α of the first spoke 8 and the expansion angle β of the connecting rod 11 are both increased, so that the component of the external aerodynamic load p(x) along the tangential direction of the first spoke 8 and the second spoke 9 increases, and the aerodynamic deceleration effect is enhanced. Through the dynamic response of the elongation of the tensioning cable 3CFEHCFGH to the external aerodynamic load p(x), the expansion angle and bending stiffness of the first spoke 8 can be adaptively adjusted with the external load, thereby protecting the load-bearing components and providing a more stable deceleration effect for the detector.

[0055] Embodiment 2

[0056] This embodiment provides a detector, including the secondary deployable pneumatic reducer 100 of the first embodiment.

[0057] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A secondary deployable pneumatic reducer, characterized in that: include: A main body unit, the main body unit comprising a supporting body; A rigid expandable unit, the rigid expandable unit comprising a plurality of expandable components, the expandable components comprising a first spoke, a second spoke and a connecting rod, one end of the first spoke being hinged to the top of the support body, and the hinge axis of the two being perpendicular to the axis of the support body, the other end of the first spoke being slidably connected to one end of the second spoke, one end of the connecting rod being hinged to one end of the second spoke close to the first spoke, and the hinge axis of the two being perpendicular to the axis of the support body; the expandable components being uniformly distributed circumferentially around the axis of the support body; A driving unit, the driving unit comprising a driving sleeve, a driver and a tensioning cable, the driving sleeve being slidably sleeved on the outside of the supporting body, the sliding direction of the driving sleeve being parallel to the axis of the supporting body, the driving sleeve being located below the deployable component, the end of the connecting rod away from the second spoke being hinged to the top of the driving sleeve, and the hinge axis of the two being perpendicular to the axis of the supporting body, the driver being connected to the supporting body, one end of the tensioning cable being connected to the driver, and the other end of the tensioning cable being connected to the hinge of the first spoke and the connecting rod after passing around the bottom of the driving sleeve; the tensioning cable being made of elastic material, and the tensioning cable corresponding to the deployable component one by one; The skin is made of a flexible material and is laid on the deployable component. The deployment of the deployable component can drive the skin to deploy.

2. The secondary deployable pneumatic reducer according to claim 1, characterized in that: The second spoke is slidably sleeved on the outside of the first spoke.

3. The secondary deployable pneumatic reducer according to claim 2, characterized in that: The cross sections of the first spoke and the second spoke are both rectangular, and a block is arranged between the first spoke and the second spoke to limit the sliding limit position of the second spoke.

4. The secondary deployable pneumatic reducer according to claim 1, characterized in that: The first spoke is hinged to the support body by a first pin seat, the first pin seat is connected to the support body, the connecting rod is hinged to the second spoke by a second pin seat, the second pin seat is connected to the second spoke, the connecting rod is hinged to the drive sleeve by a third pin seat, the third pin seat is connected to the drive sleeve; A side of the third pin seat close to the support body is an arc surface matching the outer peripheral surface of the support body.

5. The secondary deployable pneumatic reducer according to claim 4, characterized in that: A fixed pulley is provided at the bottom of the driving sleeve, and the fixed pulley is rotatably connected to the driving sleeve. The rotation axis of the fixed pulley is perpendicular to the axis of the supporting body. The tensioning cable is connected to the second pin shaft seat after passing around the fixed pulley, and the fixed pulley corresponds to the tensioning cable one by one.

6. The secondary deployable pneumatic reducer according to claim 4, characterized in that: The driving sleeve includes a support rod and two driving rings. The two driving rings are arranged in parallel along the axial direction of the supporting body. The support rod connects the two driving rings. There are multiple support rods, and the support rods are evenly distributed circumferentially around the axis of the supporting body.

7. The secondary deployable pneumatic reducer according to claim 6, characterized in that: The third pin seat is arranged on the upper driving ring, and the side of the third pin seat close to the supporting body has a first passing groove allowing the tensioning cable to pass through, and the inner side wall of the driving ring has a second passing groove allowing the tensioning cable to pass through, and the first passing groove and the second passing groove are both U-shaped grooves with the opening direction facing the axial direction of the supporting body.

8. The secondary deployable pneumatic reducer according to claim 5, characterized in that: The main body unit further comprises a top reinforcement layer, a bottom reinforcement layer and a heat protection head cone, wherein the top reinforcement layer is arranged at the top of the support body, the bottom reinforcement layer is arranged at the bottom of the support body, and the heat protection head cone is arranged on the top reinforcement layer; The bottom reinforcing layer has a third through groove capable of accommodating the fixed pulley, and the third through groove is a U-shaped groove with an opening facing away from the axis direction of the supporting body.

9. The secondary deployable pneumatic reducer according to claim 1, characterized in that: The driver is built in the supporting body, and a through hole matched with the tensioning cable is provided on the side wall of the supporting body. One end of the tensioning cable passes through the through hole and is connected with the driver.

10. The secondary deployable pneumatic reducer according to any one of claims 1 to 9, characterized in that: A restraining element is provided between the driving sleeve and the supporting body, and the restraining element can fix the relative position between the driving sleeve and the supporting body.

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