A two-stage deployable pneumatic reducer

Abstract

This invention discloses a two-stage deployable pneumatic reducer, comprising a main body unit, a rigid deployable unit, a drive unit, and a skin. The deployable component includes a first spoke, a second spoke, and a connecting rod. The drive unit includes a drive sleeve, a driver, and a tension cable. The deployment process includes a first deployment stage and a second deployment stage. In the first deployment stage, the driver pulls the tension cable, driving the second spoke to slide relative to the first spoke, achieving full deployment of the second spoke. In the second deployment stage, the drive sleeve slides upward along the axis of the supporting main body under the drive of the tension cable, and the connecting rod drives the first and second spokes to rotate relative to the supporting main body, causing the skin to fully deploy, thus achieving full deployment of the pneumatic reduction surface of the pneumatic reducer. The elongation of the tension cable increases with the increase of the external aerodynamic load and the elasticity of the flexible skin, enabling adaptive adjustment of the bending stiffness and deployment angle of the deployable component according to changes in the external aerodynamic load.

Description

Technical Field

[0001] This invention relates to the field of pneumatic reducer technology, and in particular to a two-stage deployable pneumatic reducer. Background Technology

[0002] In the field of planetary landing exploration, the two-stage deployable aerodynamic decelerator can achieve the folding and unfolding of spokes, significantly increasing the aerodynamic deceleration area while reducing the folded volume. During the aerodynamic deceleration process of the deployable aerodynamic decelerator, complex external aerodynamic loads act 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 this invention is to provide a two-stage 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 stress-bearing components.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a two-stage deployable pneumatic reducer, comprising:

[0006] Main body unit, the main body unit includes a supporting body;

[0007] A rigid deployable unit includes multiple deployable components. Each deployable component includes 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 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 the end of the second spoke near the first spoke, and the hinge axis is perpendicular to the axis of the support body. The deployable components are evenly distributed circumferentially around the axis of the support body.

[0008] The drive unit includes a drive sleeve, a driver, and a tension cable. The drive sleeve is slidably fitted onto the outside of the support body, and the sliding direction of the drive sleeve is parallel to the axis of the support body. The drive 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 drive sleeve, and the hinge axis of the two is perpendicular to the axis of the support body. The driver is connected to the support body. One end of the tension cable is connected to the driver, and the other end of the tension cable passes around the bottom of the drive sleeve and is connected to the hinge point of the first spoke and the connecting rod. The tension cable is made of an elastic material, and each tension cable corresponds to one of the deployable components.

[0009] The skin is made of a flexible material and is applied to the deployable component, which extends to unfold the skin.

[0010] Preferably, the second spoke is slidably fitted onto the outside of the first spoke.

[0011] Preferably, the cross-sections of the first spoke and the second spoke are both rectangular, and a locking 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 using a first pin seat, and the first pin seat is connected to the support body; the connecting rod is hinged to the second spoke using a second pin seat, and the second pin seat is connected to the second spoke; the connecting rod is hinged to the drive sleeve using a third pin seat, and the third pin seat is connected to the drive sleeve.

[0013] The side of the third pin seat closest to the support body is an arc surface that matches the outer peripheral surface of the support body.

[0014] Preferably, a fixed pulley is provided at the bottom of the drive sleeve, the fixed pulley is rotatably connected to the drive sleeve, the rotation axis of the fixed pulley is perpendicular to the axis of the support body, the tension cable passes around the fixed pulley and is connected to the second pin seat, and the fixed pulley and the tension cable correspond one-to-one.

[0015] Preferably, the drive sleeve includes a support rod and two drive rings, the two drive rings are arranged parallel to each other along the axial direction of the support body, the support rod connects the two drive rings, and there are multiple support rods, which are evenly distributed around the axial direction of the support body.

[0016] Preferably, the third pin seat is disposed on the upper drive ring, and the side of the third pin seat near the support body has a first through groove that allows the tension cable to pass through, and the inner sidewall of the drive ring has a second through groove that allows the tension cable to pass through. Both the first through groove and the second through groove are U-shaped grooves with their opening direction facing the axial direction of the support body.

[0017] Preferably, the main body unit further includes a top reinforcing layer, a bottom reinforcing layer, and a heat-resistant head cone. The top reinforcing layer is disposed on the top of the supporting body, the bottom reinforcing layer is disposed on the bottom of the supporting body, and the heat-resistant head cone is disposed on the top reinforcing layer.

[0018] The bottom reinforcing layer has a third passage groove capable of accommodating the fixed pulley, the third passage groove being a U-shaped groove with its opening facing away from the axis of the supporting body.

[0019] Preferably, the driver is built into the support body, and the side wall of the support body has a through hole adapted to the tension cable, one end of the tension cable passing through the through hole and connected to the driver.

[0020] Preferably, a constraint element is provided between the drive sleeve and the support body, and the constraint element can fix the relative position between the drive sleeve and the support body.

[0021] The present invention achieves the following technical advantages over related technologies: 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 supporting body; the rigid deployable unit includes multiple sets of deployable components, each deployable component including a first spoke, a second spoke, and a connecting rod. One end of the first spoke is hinged to the top of the supporting body, and the hinge axis of the two is perpendicular to the axis of the supporting 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 the end of the second spoke near the first spoke, and the hinge axis of the two is perpendicular to the axis of the supporting body. The deployable components are evenly distributed circumferentially around the axis of the supporting body; the drive unit... The system includes a drive sleeve, a driver, and a tension cable. The drive sleeve is slidably fitted onto the outside of the support body, and the sliding direction of the drive sleeve is parallel to the axis of the support body. The drive 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 drive sleeve, and the hinge axis of the two is perpendicular to the axis of the support body. The driver is connected to the support body. One end of the tension cable is connected to the driver, and the other end of the tension cable passes around the bottom of the drive sleeve and is connected to the hinge point of the first spoke and the connecting rod. The tension cable is made of an elastic material, and the tension cable corresponds one-to-one with the deployable component. The skin is made of a flexible material and 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 this invention includes a first deployment stage and a second deployment stage. In the first deployment stage, the driver pulls the tension cable, driving the second spoke to slide relative to the first spoke, thus fully deploying the second spoke. In the second deployment stage, the drive sleeve slides upward along the axis of the support body under the drive of the tension cable, and the connecting rod drives the first and second spokes to rotate relative to the support body, causing the skin to fully deploy, thus fully deploying the pneumatic deceleration surface of the pneumatic reducer. After the pneumatic reducer is fully deployed, it maintains a pre-tensioned state under the combined action of the tension cable, the flexible skin, and the pneumatic load, and the first and second spokes are locked by motion constraints. The tension cable is elastic, and its elongation increases with the increase of the external pneumatic load and the elastic force of the flexible skin. This causes the bending stiffness and deployment angle of the deployable component to increase and decrease respectively with the increase of the external pneumatic load, enabling adaptive adjustment of the bending stiffness and deployment angle of the deployable component with changes in the external pneumatic load, improving the stability of the pneumatic deceleration effect, and effectively protecting the stressed components. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the secondary deployable pneumatic reducer disclosed in the embodiment of the present invention when it is deployed;

[0025] Figure 2 This is a schematic diagram of the structure of the secondary deployable pneumatic reducer when it is retracted, as disclosed in an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the rigid deployable unit of the secondary deployable pneumatic reducer disclosed in the embodiments of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the third pin seat of the secondary deployable pneumatic reducer disclosed in the embodiments of the present invention;

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

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

[0030] Figure 7This is a 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 A cross-sectional view along the AA direction;

[0032] Figure 9 This is a cross-sectional schematic diagram of a portion of the rigid deployable unit of the secondary deployable pneumatic reducer disclosed in an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram illustrating the principle of pretensioning and stiffness self-adaptation of the secondary deployable pneumatic reducer disclosed in the embodiments of the present invention.

[0034] In the diagram: 100, a two-stage deployable pneumatic reducer;

[0035] 1. Rigid deployable unit; 2. Skin; 3. Tensioning cable; 4. Main body unit; 5. Drive sleeve; 6. Heat-resistant 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. Drive ring; 17. Support rod; 18. Fixed pulley; 19. Support body; 20. Top reinforcing layer; 21. Through hole; 22. Third through groove; 23. Constraint element; 24. Bottom reinforcing layer; 25. Driver. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The purpose of this invention is to provide a two-stage 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 stress-bearing components.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] This invention provides a two-stage deployable pneumatic reducer 100, please refer to [reference needed]. Figures 1-10The system includes a main body unit 4, a rigid deployable unit 1, a drive unit, and a skin 2. The main body unit 4 includes a support body 19. The rigid deployable unit 1 includes multiple deployable components, each including 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 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 the end of the second spoke 9 near the first spoke 8, and the hinge axis is perpendicular to the axis of the support body 19. The deployable components are evenly distributed circumferentially around the axis of the support body 19. The drive unit includes a drive sleeve 5, a driver 25, and a tension cable 3. The sleeve 5 is slidably fitted onto the outside of the support body 19. 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 tension cable 3 is connected to the driver 25. The other end of the tension cable 3 passes around the bottom of the drive sleeve 5 and is connected to the hinge of the first spoke 8 and the connecting rod 11. The tension cable 3 is made of elastic material and corresponds one-to-one with the deployable component. The skin 2 is made of flexible material and 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 includes a first deployment stage and a second deployment stage. In the first deployment stage, the driver 25 pulls the tension cable 3, driving the second spoke 9 to slide relative to the first spoke 8, thus 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 tension cable 3, and the connecting rod 11 drives the first spoke 8 and the second spoke 9 to rotate relative to the support body 19, driving the skin 2 to fully deploy, thus achieving full deployment of the pneumatic reduction surface of the pneumatic reducer. After the pneumatic reducer is fully deployed, it maintains a pre-tensioned state under the combined action of the tension 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 tension cable 3 is elastic, and its elongation increases with the increase of the external aerodynamic load and the elastic force of the flexible skin 2. This causes the bending stiffness and deployment angle of the deployable component to increase and decrease respectively with the increase of the external aerodynamic load. This enables the bending stiffness and deployment angle of the deployable component to adaptively adjust with changes in the external aerodynamic load, improving the stability of the aerodynamic deceleration effect and effectively protecting the stressed components. The secondary deployable pneumatic reducer 100 of the present invention significantly increases the aerodynamic deceleration surface through secondary folding and unfolding. When retracted, it can reduce the overall folded volume and axial dimension of the structure, which is beneficial to improving the adaptability of the pneumatic reducer.

[0042] The second spoke 9 is slidably fitted onto the outside of the first spoke 8, ensuring that the second spoke 9 can slide smoothly along the first spoke 8, and reducing the space occupied by the structure when folded and retracted.

[0043] In this specific embodiment, both the first spoke 8 and the second spoke 9 have rectangular cross-sections. This ensures smooth reciprocating sliding of the second spoke 9 while preventing misalignment caused by relative rotation between the first spoke 8 and the second spoke 9, thus improving the movement accuracy of the second spoke 9. In other specific embodiments achievable by this invention, the cross-sectional shapes of the first spoke 8 and the second spoke 9 can also be triangular, other polygonal, or irregular shapes. It should also be noted that a locking block is provided between the first spoke 8 and the second spoke 9 to limit the sliding limit position of the second spoke 9, preventing the second spoke 9 from slipping off the first spoke 8 and improving the structural stability and movement reliability of the unfolding assembly.

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

[0045] It should also be noted that the side of the third pin seat 12 closest to the support body 19 is an arc surface 14 that matches the outer circumferential surface of the support body 19. This prevents the third pin seat 12 from affecting the reciprocating sliding of the drive sleeve 5, while increasing the contact area between the third pin seat 12 and the support body 19. This allows the third pin seat 12 to better bear the external aerodynamic load transmitted by the connecting rod 11 and significantly improves the smoothness of its own movement.

[0046] It should also be emphasized that a fixed pulley 18 is provided at the bottom of the drive sleeve 5. The fixed pulley 18 is rotatably connected to the drive sleeve 5, and the axis of rotation of the fixed pulley 18 is perpendicular to the axis of the support body 19. The tension cable 3 passes around the fixed pulley 18 and is connected to the second pin seat 10. The fixed pulley 18 and the tension cable 3 correspond one-to-one. The drive sleeve 5 can ensure the synchronous deployment of multiple sets of deployable components. The fixed pulley 18 at the bottom of the drive sleeve 5 changes the direction of force applied to the tension cable 3, ensuring the deployment reliability of the pneumatic reducer while saving 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 parallel to each other along the axis of the support body 19. The support rod 17 connects the two drive rings 16. There are multiple support rods 17, which are evenly distributed circumferentially around the axis of the support body 19. This improves the uniformity of the force on the drive rings 16, ensures the smooth 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 centers of mass of the third pin seat 12, the support rod 17, and the fixed pulley 18 are collinear. This concentrates the external aerodynamic load acting on the third pin seat 12 and the elastic force of the tension cable 3 acting on the fixed pulley 18 onto the support rod 17, which has good compressive strength, thereby improving the load-bearing capacity of the drive sleeve 5.

[0048] In addition, the third pin seat 12 is disposed on the upper drive ring 16. The trapezoidal bottom surface of the third pin seat 12 is connected to the drive ring 16. The side of the third pin seat 12 near the support body 19 has a first through groove 13 that allows the tension cable 3 to pass through. The inner side wall of the drive ring 16 has a second through groove 15 that allows the tension cable 3 to pass through. Both the first through groove 13 and the second through groove 15 are U-shaped grooves with their opening direction facing the axis of the support body 19. The side length of both the first through groove 13 and the second through groove 15 is greater than the diameter of the tension cable 3, providing movement space for the tension cable 3 and avoiding affecting the normal operation of the tension cable 3.

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

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

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

[0052] Furthermore, a constraint element 23 is provided between the drive sleeve 5 and the support body 19, which can fix the relative position between the drive sleeve 5 and the support body 19. In this specific embodiment, there are multiple constraint elements 23, which are disposed in the third through groove 22. In the first deployment stage of the secondary deployable pneumatic reducer 100 of the present invention, the constraint element 23 locks the drive sleeve 5, and the driver 25 pulls the tension cable 3 to drive the second spoke 9 to slide along the axis of the first spoke 8, so as to achieve the 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 tension 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. The drive sleeve 5 is driven by the tension cable 3 to translate upward along the axis of the support body 19, driving the locked first spoke 8 and second spoke 9 to rotate around the rotation axis of the first pin seat 7, so as to achieve the full deployment of the pneumatic deceleration surface.

[0053] The following is combined with Figure 10 The working principle of the secondary deployable pneumatic reducer 100 of the present invention will be 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 inevitably bend and deform. 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, which will cause the connecting rod 11CD to rotate around the third pin seat 12D, thus reducing the unfolding angle β of the connecting rod 11CD. According to the cosine theorem, the length of the tension cable 3CF segment increases as the unfolding angle β of the connecting rod 11 decreases. According to Huke's law, the elastic force T also increases as the unfolding angle β of the connecting rod 11 decreases. The increased elastic force T can drive the unfolding angle β of the connecting rod 11 to increase, suppressing the rotation of the connecting rod 11 caused by the bending deformation of the first spoke 8AC, thereby reducing the bending deformation of the first spoke 8AC and realizing the adaptive enhancement of the bending stiffness of the first spoke 8AC as the aerodynamic load increases.

[0054] In this specific embodiment, such as Figure 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-tension state of the pneumatic reducer is broken, and the drive sleeve 5DF moves vertically downward along the axis l' of the support body 19 under the action of the axial force FCD of the connecting rod 11. This causes the first spoke 8AC, the second spoke 9BC and the connecting rod 11CD to make planar motion, which reduces the unfolding angle α of the first spoke 8, the unfolding angle β of the connecting rod 11 and the angle γ between the tension cable 3CFEHCF segment and the axis of the support body 19. The decrease in the unfolding 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 on the first spoke 8AC and the second spoke 9BC. During the above process, the translation of the drive sleeve 5DF increases the length of the tension cable 3EF segment, the fixed-axis rotation of the connecting rod 11DF increases the length of the tension cable 3CF segment, and the planar motion of the drive sleeve 5DF and the connecting rod 11CD allows the elongation of the tension cable 3CFEH to increase more significantly. The component of the resultant elastic force of the tension cable 3CFEH in the vertically upward direction along the axis of the support body 19 also increases until the entire pneumatic reducer maintains a new equilibrium state under the action of the increased external aerodynamic load p(x) and the increased elastic force T of the tension cable 3CFEH. After the entire pneumatic reducer also reaches a new pre-tension 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 decreases significantly, the axial force FCD of the connecting rod 11 also decreases significantly. The pre-tension state of the pneumatic reducer is broken again. Under the action of the elastic force T of the tension cable 3CFEH, the drive sleeve 5DF moves vertically upward along the axis l' of the support body 19, causing the rigid deployable unit 1 to perform planar motion. The elastic force T of the tension cable 3CFEH decreases to a new equilibrium state with the reduced external aerodynamic load p(x), increasing the tangential component of the aerodynamic load acting on the spokes. During this process, the unfolding angle α of the first spoke 8 and the unfolding angle β of the connecting rod 11 both increase, increasing the component of the external aerodynamic load p(x) along the tangential direction of the first spoke 8 and the second spoke 9, thus enhancing the aerodynamic deceleration effect. By using the dynamic response of the elongation of the tension cable 3CFEHCFGH to the external aerodynamic load p(x), the unfolding angle and bending stiffness of the first spoke 8 can be adaptively adjusted according to the external load, protecting the stressed components and providing a more stable deceleration effect for the detector.

[0055] Example 2

[0056] This embodiment provides a detector, including the secondary deployable pneumatic reducer 100 of Embodiment 1.

[0057] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A two-stage deployable pneumatic reducer, characterized in that, include: Main body unit, the main body unit includes a supporting body; A rigid deployable unit includes multiple deployable components. Each deployable component includes 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 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 the end of the second spoke near the first spoke, and the hinge axis is perpendicular to the axis of the support body. The deployable components are evenly distributed circumferentially around the axis of the support body. The drive unit includes a drive sleeve, a driver, and a tension cable. The drive sleeve is slidably fitted onto the outside of the support body, and the sliding direction of the drive sleeve is parallel to the axis of the support body. The drive sleeve is located below the deployable assembly. The end of the connecting rod away from the second spoke is hinged to the top of the drive sleeve, and the hinge axis of the two is perpendicular to the axis of the support body. The driver is connected to the support body and located inside the upper part of the support body. One end of the tension cable is connected to the driver, and the other end of the tension cable passes around the bottom of the drive sleeve and is hinged to the first spoke and the connecting rod. The connecting rod is hinged to the second spoke via a second pin seat, and the second pin seat is connected to the second spoke. The tension cable is made of elastic material, and each tension cable corresponds to one of the deployable components. A fixed pulley is provided at the bottom of the drive sleeve, and the fixed pulley is rotatably connected to the drive sleeve. The rotation axis of the fixed pulley is perpendicular to the axis of the support body. The tension cable passes over the fixed pulley and is connected to the second pin seat. Each fixed pulley corresponds to one of the tension cables. A constraint element is provided between the drive sleeve and the support body, and the constraint element can fix the relative position between the drive sleeve and the support body. A skin, the skin being made of a flexible material, is applied to the deployable component, and the extension of the deployable component can cause the skin to unfold. In the first deployment phase, the constraint element locks the drive sleeve, and then controls the constraint element to release the constraint between the drive sleeve and the support body, thereby achieving the complete deployment of the pneumatic deceleration surface.

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

3. The secondary deployable pneumatic reducer according to claim 2, characterized in that: Both the first spoke and the second spoke have rectangular cross-sections, and a locking block is provided 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 using a first pin seat, and the first pin seat is connected to the support body. The connecting rod is hinged to the drive sleeve using a third pin seat, and the third pin seat is connected to the drive sleeve. The side of the third pin seat closest to the support body is an arc surface that matches the outer peripheral surface of the support body.

5. The secondary deployable pneumatic reducer according to claim 4, characterized in that: The drive sleeve includes a support rod and two drive rings. The two drive rings are arranged parallel to each other along the axial direction of the support body. The support rod connects the two drive rings. There are multiple support rods, which are evenly distributed around the circumference of the support body.

6. The secondary deployable pneumatic reducer according to claim 5, characterized in that: The third pin seat is disposed on the upper drive ring. The side of the third pin seat near the support body has a first through groove that allows the tension cable to pass through. The inner sidewall of the drive ring has a second through groove that allows the tension cable to pass through. Both the first through groove and the second through groove are U-shaped grooves with their opening direction facing the axial direction of the support body.

7. The secondary deployable pneumatic reducer according to claim 1, characterized in that: The main body unit also includes a top reinforcing layer, a bottom reinforcing layer, and a heat-resistant head cone. The top reinforcing layer is disposed on the top of the supporting body, the bottom reinforcing layer is disposed on the bottom of the supporting body, and the heat-resistant head cone is disposed on the top reinforcing layer. The bottom reinforcing layer has a third passage groove capable of accommodating the fixed pulley, the third passage groove being a U-shaped groove with its opening facing away from the axis of the supporting body.

8. The secondary deployable pneumatic reducer according to claim 1, characterized in that: The driver is built into the support body, and the side wall of the support body has a through hole adapted to the tension cable. One end of the tension cable passes through the through hole and is connected to the driver.

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