Anti-twist mechanism for return capsule pendant sling

Abstract

The application discloses a return capsule vertical hanging sling anti-twist mechanism and belongs to the technical field of slings, and aims to solve the problems of poor anti-twist effect, insufficient adaptability and easy damage to the sling of the existing sling anti-twist mechanism. The mechanism comprises a return capsule, a parachute side connecting seat, a sling, a storage cabin, a rigid connecting body, a connecting support, a flexible buffer assembly and a load sensor. The rigid connecting body and the flexible buffer assembly cooperate with each other, the guide sleeve in the flexible buffer assembly limits the radial swing of the sling through the guide groove, the memory alloy spring provides a reverse restraining force to offset the torsional force, the load sensor collects force data in real time, and the anti-torsion degree is adaptively adjusted. The anti-twist mechanism has reliable anti-twist effect, can adapt to the changes of the sling posture and load, can effectively protect the sling and prolong the service life of the sling, has a reasonable structure and is convenient to store and reuse, and can improve the landing stability of the return capsule.

Description

Technical Field

[0001] This invention relates to the field of sling technology, specifically to an anti-torsion mechanism for the sling of a return capsule. Background Technology

[0002] With the rapid development of the aerospace industry and the continuous improvement of the reliability and safety of return capsules, the application scope of return capsules is constantly expanding, and the number of return capsules used is also increasing. During the landing process, the return capsule needs to be connected to the parachute through a hanging sling to achieve buffering and deceleration. The hanging sling is an indispensable part of the return capsule landing system. During the installation and use of the hanging sling, an anti-torsion mechanism is required to ensure its working stability.

[0003] Traditional methods for preventing torsion of the slings attached to the reentry capsule include rigid limiting methods, which restrict the circumferential rotation of the slings through rigid components to maintain a stable posture. In order to improve the reliability of the slings in preventing torsion and reduce the safety hazards caused by sling torsion, the rigid structural components are mostly integrated fixed structures, usually made of high-strength alloy materials, and fixed to the connection between the reentry capsule and the slings by bolts. Their core function is to restrict the torsion of the slings through their own rigidity. However, its shortcomings are quite prominent: rigid structural components lack deformation capacity and cannot adapt to the large attitude changes during the sling landing process. When the sling is subjected to impact load and swings slightly, the rigid structural components will exert a rigid constraint on the sling, resulting in uneven stress on the sling. This not only fails to effectively suppress torsion but may also exacerbate the torsion of the sling. At the same time, rigid contact is prone to wear of the sling braid layer, shortening the service life of the sling. In the existing technology, in order to solve the problem of rigid limiting, a combination of flexible and rigid components is also used. The flexible components are mostly ordinary elastic sleeves, rubber buffer pads, etc., which can only achieve simple impact buffering and lack targeted anti-torsion design. They cannot actively counteract the torsional force of the sling. On the other hand, the buffering performance of the flexible buffer structure is fixed and cannot be adaptively adjusted according to the impact load on the sling. When the sling load is large, the flexible structure is prone to excessive deformation and loses its buffering and anti-torsion function; when the sling load is small, the constraint force of the flexible structure is insufficient and cannot effectively limit the torsion of the sling. Therefore, we propose an anti-torsion mechanism for the sling suspended by the return capsule. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-torsion mechanism for the suspending cable of the return capsule, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an anti-torsion mechanism for a return capsule suspending sling, comprising a return capsule, a parachute-side connecting seat, and a sling body, wherein a storage compartment is provided on the top of the return capsule, characterized in that: multiple rigid connectors are installed at equal angles inside the storage compartment and at the bottom of the parachute-side connecting seat; each rigid connector includes an anti-torsion arm, the anti-torsion arm having a crimping cavity, and both ends of the sling body being fixed in the crimping cavity by high-pressure crimping; a connecting bracket is installed at the end of the anti-torsion arm located at the storage compartment, and a flexible buffer assembly is provided on the connecting bracket and sleeved on the outside of the sling body; the flexible buffer assembly includes a guide sleeve connected to the connecting bracket, the inner wall of the guide sleeve having multiple sets of guide grooves at equal angles parallel to the axis of the sling body, and the outside of the sling body being embedded in the guide grooves; an installation groove is provided on the outside of the guide sleeve, and a memory alloy spring is provided at the installation groove, the pitch of the memory alloy spring being opposite to the twist direction of the sling body, and spirally wound around the outside of the guide sleeve.

[0006] Preferably, the guide sleeve is a thin-walled cylindrical tube, and the guide sleeve is coaxially arranged with the sling body. Both ends of the guide sleeve are provided with rounded anti-friction layers.

[0007] Preferably, the guide grooves on the inner wall of the guide sleeve are in three sets, the two sides of the guide grooves are soft rubber edges, and the three sets of guide grooves are evenly distributed in an arc shape on the outside of the sling body.

[0008] Preferably, the rigid connector further includes a sling anchor cup; multiple mounting blocks are installed at the bottom of the storage compartment and the umbrella-side connecting seat; the lower part of the sling anchor cup is fixed to the mounting block by bolts; a spherical hinge seat is provided at the upper part of the sling anchor cup; a hinge ball is provided at the bottom of the anti-torsion arm; the hinge ball is installed in the spherical hinge seat; and a spherical hinge sleeve for limiting the swing amplitude of the anti-torsion arm is installed on the spherical hinge seat.

[0009] Preferably, the ball joint sleeve includes a mounting ring mounted on the top of the ball joint seat, and the mounting ring is provided with a wrapping body that wraps around the outside of the anti-torsion arm; the wrapping body is conical and has multiple elastic compression grooves.

[0010] Preferably, the outer side of the package is provided with a compression groove, and elastic compression pieces are distributed in the compression groove; a sliding body is sleeved on the outside of the package, and the sliding body adjusts the tightness of the elastic compression groove by squeezing the elastic compression pieces along the compression groove, thereby changing the wrapping force of the package against the torsion arm.

[0011] Preferably, the sliding body includes a compression ring fitted around the outside of the package, the compression ring having multiple contraction sections; a connecting rod is connected to the outside of the compression ring, one end of the connecting rod having a sliding sleeve; a guide ring is provided on the inner wall of the storage compartment, the guide ring having multiple sets of elastic sections corresponding one-to-one with the package; the elastic section includes two limiting plates fixedly installed on the inner wall of the storage compartment, the sliding sleeve is fitted on the guide ring, a return spring is provided between the outside of the sliding sleeve and the limiting plate, and the return spring is fitted on the guide ring.

[0012] Preferably, the connecting bracket includes a bracket sleeve fitted over the outside of the anti-torsion arm, the bracket sleeve being provided with an elastic compression sleeve, the top of the elastic compression sleeve being provided with a mounting plate for installing a guide sleeve, and the sling body passing through the center of the mounting plate.

[0013] Preferably, a load sensor is provided at the bottom of the spherical hinge seat, and the hinge ball is in contact with the load sensor to collect the force data of the sling body in real time.

[0014] Preferably, the storage compartment is provided with multiple storage slots for storing the sling body, and the storage slots are arranged one-to-one with the sling body.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention employs a rigid connector to provide stable support and limit, combined with a flexible buffer component to achieve a dual mechanism of active reverse constraint. This fundamentally suppresses the circumferential torsion and radial sway of the sling during the landing impact process. Compared with traditional single rigid limit or simple flexible buffer, the anti-torsion logic of this solution is more proactive and synergistic, which can effectively prevent the sling and parachute from getting tangled, ensuring the stability and safety of the return capsule's landing attitude.

[0017] 2. By introducing a flexible buffer component between the rigid connector and the sling and using structures such as guide sleeves, this invention avoids direct rigid contact and hard constraints between metal parts and the sling braid layer. This not only significantly reduces local wear and stress concentration of the sling during operation, but also effectively buffers impact loads, significantly extends the service life of the sling body, and reduces maintenance costs and safety hazards during long-term use.

[0018] 3. The rigid connector of this invention can adapt to the large attitude changes of the sling during landing through the hinged structure, while the shape memory alloy spring and other components in the flexible buffer assembly can automatically adjust the restraint force according to the load on the sling. This allows the mechanism to maintain stable anti-torsion performance under the influence of complex environmental factors such as wind speed and temperature, and can easily cope with the complex environment from launch to landing without manual intervention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall and partial explosion of the present invention;

[0021] Figure 3 for Figure 1 Schematic diagram after removing the umbrella-side connecting seat;

[0022] Figure 4 This is a schematic diagram of the structure after the return capsule and parachute side connecting seat are removed in this invention;

[0023] Figure 5 This is a schematic diagram of the structure of a single sling body, a rigid connector, and a flexible buffer assembly according to the present invention;

[0024] Figure 6 for Figure 5 A schematic diagram of the localized explosion structure;

[0025] Figure 7 This is a schematic diagram of the rigid connector and ball joint sleeve structure of the present invention;

[0026] Figure 8 for Figure 7 Schematic diagram of the structure after the elastic compression sheet has been removed;

[0027] Figure 9 This is a partial cross-sectional structural diagram of the connecting bracket at the junction of the sling body and the rigid connector.

[0028] Figure 10 This is a schematic diagram of the structure of the sling body and the flexible buffer assembly of the present invention;

[0029] Figure 11 This is a schematic diagram of the flexible buffer component structure of the present invention;

[0030] Figure 12 This is a schematic diagram of the structure at the connecting bracket of the present invention;

[0031] Figure 13 for Figure 3 Enlarged structural diagram at point A in the middle;

[0032] Figure 14 for Figure 4 Enlarged structural diagram at point B.

[0033] In the diagram: 1. Reentry capsule; 2. Parachute side connector; 3. Sling body; 4. Storage compartment; 5. Rigid connector; 6. Connecting bracket; 7. Flexible buffer assembly; 8. Mounting block; 9. Bolt; 10. Ball joint sleeve; 11. Mounting ring; 12. Enclosure; 13. Elastic compression plate; 14. Sliding body; 15. Compression ring; 16. Retraction section; 17. Connecting rod; 18. Sliding sleeve; 19. Guide ring; 20. Elastic zone; 21. Limiting plate; 22. Return spring; 23. Load sensor; 41. Storage slot; 51. Anti-torsion arm; 52. Press-fit cavity; 53. Sling anchor cup; 54. Ball joint seat; 55. Hinge ball; 61. Bracket sleeve; 62. Elastic compression sleeve; 63. Mounting plate; 71. Guide sleeve; 72. Guide groove; 73. Mounting groove; 74. Memory alloy spring. Detailed Implementation

[0034] 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.

[0035] This invention provides a technical solution: an anti-torsion mechanism for the suspending cable of a return capsule. The anti-torsion mechanism of the return capsule suspending cable of this invention is arranged along the axis of "return capsule 1 - storage compartment 4 - rigid connector 5 - suspending cable body 3 - parachute side connector 2". Its core function is to achieve a reliable connection between the return capsule 1 and the parachute, while suppressing the circumferential torsion of the suspending cable body 3. To ensure the overall stability of the device installation and uniform force distribution, this device adopts a one-to-one arrangement of multiple sets of rigid connectors 5 and suspending cable bodies 3. All components are symmetrically arranged with the axis of the suspending cable body 3 as the center, thus ensuring the overall reliability of the anti-torsion mechanism.

[0036] To ensure the orderly storage of the sling body 3 and various anti-torsion components during the launch phase, prevent impact and wear on the components, and reduce the overall space occupied by the device, a storage compartment 4 is set on the top of the return capsule 1. To ensure that the sling body 3 does not get tangled when stored and unfolds smoothly, the storage compartment 4 is equipped with multiple storage slots 41 that correspond one-to-one with the sling body 3. The sling body 3 can be folded and stored in the storage slots 41.

[0037] Since the storage compartment 4 needs to bear the weight of the rigid connector 5 and the sling body 3 to be installed later, and also needs to withstand the impact load when the return capsule 1 lands, the inner wall of the storage compartment 4 needs to have sufficient structural strength. At the same time, in order to realize the adaptive adjustment of the swing damping of the anti-torsion arm 51 and ensure the stability of the anti-torsion effect, a guide ring 19 is set on the inner wall of the storage compartment 4. The guide ring 19 will work with the sliding body 14 to realize the flexible adjustment of the wrapping force of the anti-torsion arm 51.

[0038] To ensure a reliable connection between the sling body 3 and the parachute and to transmit the parachute's tension, a parachute-side connecting seat 2 is installed on the upper part of the device. The parachute-side connecting seat 2 is connected to the bottom of the parachute connector and provides a fixed support for the upper end of the sling body 3. To ensure that the multiple sling bodies 3 are subjected to uniform force and to avoid overloading of a single sling, multiple mounting blocks 8 are installed at equal angles at the bottom of the parachute-side connecting seat 2 and inside the storage compartment 4. The core function of the mounting blocks 8 is to fix the rigid connectors 5, so that the multiple sets of rigid connectors 5 are evenly distributed in a ring, thereby ensuring that the tension of the sling body 3 can be evenly transmitted to the return capsule 1 and improving the overall stress stability of the device.

[0039] To ensure a reliable connection between the return capsule 1, the parachute side connector 2, and the sling body 3, and to provide initial anti-torsion function, rigid connectors 5 are fixed on the mounting block 8. The number of rigid connectors 5 is the same as that of the sling body 3, and they are evenly distributed around the circumference of the storage capsule 4 and the parachute side connector 2. Since the sling body 3 needs to transmit a large landing impact force, ordinary connection methods cannot meet the strength requirements. Therefore, a sling anchor cup 53 is set in the rigid connector 5. The lower part of the sling anchor cup 53 is fixed to the mounting block 8 by bolts 9. The internal crimping cavity 52 can realize high-pressure crimping and fixing at both ends of the sling body 3, preventing the sling body 3 from falling off or sliding during the stress process.

[0040] To accommodate the attitude changes of the sling body 3 during landing and to prevent uneven stress on the sling body 3 due to the rigid fixation of the anti-torsion arm 51, a spherical hinge seat 54 is provided on the upper part of the sling anchor cup 53, and a hinge ball 55 is provided at the bottom of the anti-torsion arm 51. The hinge ball 55 is installed in the spherical hinge seat 54, so that the anti-torsion arm 51 can swing flexibly around the spherical hinge seat 54. To limit the swing amplitude of the anti-torsion arm 51 and prevent excessive swing from aggravating the torsion of the sling body 3, a ball hinge sleeve 10 is installed on the spherical hinge seat 54. At the same time, to achieve the synergistic effect of rigid anti-torsion and flexible anti-torsion and improve the anti-torsion effect, a connecting bracket 6 is installed at the end of the anti-torsion arm 51. The connecting bracket 6 will be used to install the subsequent flexible buffer component 7.

[0041] The ball joint sleeve 10 includes a mounting ring 11 installed on the top of the ball joint seat 54 and a wrapping body 12 wrapped around the outside of the anti-torsion arm 51. The wrapping body 12 is designed as a conical sleeve and has multiple elastic compression grooves. It can restrict the circumferential rotation of the anti-torsion arm 51 by wrapping it and adapt to the small swing of the anti-torsion arm 51 by the elastic deformation of the elastic compression grooves.

[0042] To adapt to the anti-torsion requirements of the sling body 3 under different loads and to achieve adaptive adjustment of the wrapping force of the wrapping body 12 against the torsion arm 51, a compression groove is set on the outside of the wrapping body 12, and elastic compression plates 13 are distributed in the compression groove. At the same time, a sliding body 14 is sleeved on the outside of the wrapping body 12. The sliding body 14 includes a compression ring 15 sleeved on the outside of the wrapping body 12. The compression ring 15 is provided with multiple contraction sections 16. A connecting rod 17 is connected to the outside of the compression ring 15. A sliding sleeve 18 is set at one end of the connecting rod 17. The sliding sleeve 18 is sleeved on the guide ring 19 on the inner wall of the storage compartment 4, so that the sliding body 14 can slide along the guide ring 19.

[0043] To achieve automatic reset of the sliding body 14 and ensure the stability of the wrapping force of the package 12 against the torsion arm 51, multiple sets of elastic intervals 20 corresponding to the package 12 are set on the guide ring 19. The elastic interval 20 consists of two limiting plates 21 fixed on the inner wall of the storage compartment 4. A reset spring 22 is set between the outer side of the sliding sleeve 18 and the limiting plate 21, and the reset spring 22 is sleeved on the guide ring 19. When the sling body 3 is subjected to force and twists, the anti-torsion arm 51 drives the package 12 to swing. The sliding body 14 slides along the guide ring 19 and squeezes the reset spring 22. At the same time, the contraction section 16 of the compression ring 15 squeezes the elastic compression plate 13, adjusting the tightness of the elastic compression groove, thereby changing the wrapping force of the package 12 against the torsion arm 51, realizing the adaptive adjustment of the swing damping of the anti-torsion arm 51, and ensuring anti-torsion stability.

[0044] Since the anti-torsion arm 51 and the flexible buffer assembly 7 need to be reliably connected to achieve synergistic anti-torsion, a connecting bracket 6 is installed at the end of the anti-torsion arm 51. To ensure the stable fixation of the connecting bracket 6 and the anti-torsion arm 51, the connecting bracket 6 is fitted with a bracket sleeve 61 that fits over the outside of the anti-torsion arm 51. To buffer the impact caused by the vibration of the sling body 3 and avoid wear of components due to rigid connection, an elastic compression sleeve 62 is provided on the bracket sleeve 61. To fix the guide sleeve 71 in the flexible buffer assembly 7 and ensure that the guide sleeve 71 and the sling body 3 are arranged coaxially, an mounting plate 63 is provided on the top of the elastic compression sleeve 62. The sling body 3 passes through the center of the mounting plate 63 to avoid interference between the sling body 3 and the mounting plate 63, thus providing a guarantee for the subsequent realization of the flexible anti-torsion function.

[0045] A flexible buffer assembly 7 is installed on the mounting plate 63 of the connecting bracket 6. The flexible buffer assembly 7 is sleeved on the outside of the sling body 3 and works in conjunction with the rigid anti-torsion arm 51 to form a double anti-torsion structure. The flexible buffer assembly 7 is mainly composed of a guide sleeve 71 and a memory alloy spring 74. The two achieve the anti-torsion function from the aspects of radial limiting and circumferential constraint force, respectively, and are the core actuators of the anti-torsion mechanism.

[0046] To prevent the end of the guide sleeve 71 from scratching the sling body 3, the guide sleeve 71 is designed as a thin-walled cylindrical tube, coaxially arranged with the sling body 3. Both ends are provided with rounded anti-friction layers. To limit the circumferential rotation tendency of the sling body 3 and reduce the torsional causes, three sets of guide grooves 72 parallel to the axis of the sling body 3 are provided at equal angles on the inner wall of the guide sleeve 71. Rubber soft edges are provided on both sides of the guide grooves 72, which can increase the fit between the guide grooves 72 and the sling body 3, and also buffer the friction between the two, further protecting the sling body 3.

[0047] To provide a stable mounting position for the shape memory alloy spring 74, a mounting groove 73 is provided on the outside of the guide sleeve 71. The shape memory alloy spring 74 is installed in the mounting groove 73, and the pitch of the shape memory alloy spring 74 is opposite to the twist direction of the sling body 3. It is spirally wound on the outside of the guide sleeve 71. Since the shape memory alloy spring 74 has an adaptive stiffness adjustment function, it can adjust its own stiffness according to the load change of the sling body 3 to ensure that the anti-torsion constraint force matches the sling load and further improve the stability of the anti-torsion effect.

[0048] To monitor the stress on the sling body 3 in real time and provide data support for the adaptive adjustment of the anti-torsion mechanism, ensuring that the anti-torsion mechanism is always in the best working state, a load sensor 23 is set at the bottom of the spherical hinge seat 54, so that the hinge ball 55 is in contact with the load sensor 23. When the sling body 3 is under stress, the tension is transmitted to the load sensor 23 through the anti-torsion arm 51 and the hinge ball 55. The load sensor 23 collects the stress data in real time, providing a precise basis for the sliding body 14 to adjust the wrapping force of the wrapping body 12, ensuring that the device can achieve reliable anti-torsion under different load conditions.

[0049] The guide sleeve 71 and the shape memory alloy spring 74 work together to effectively suppress the torsion of the sling body 3 from two dimensions: radial limiting and circumferential constraint. The guide groove 72 of the guide sleeve 71 has an anti-torsion function: the three sets of guide grooves 72 on the inner wall of the guide sleeve 71 are evenly distributed in an arc shape on the outside of the sling body 3. The outside of the sling body 3 is embedded in the guide groove 72. The guide groove 72 has a high degree of fit with the sling body 3, and the guide groove 72 is parallel to the axis of the sling body 3. When the sling body 3 is subjected to circumferential torsion and has a tendency to rotate circumferentially, the groove wall of the guide groove 72 will generate a radial limiting force on the sling body 3, preventing the sling body 3 from rotating circumferentially. This is equivalent to providing an "axial track" for the sling body 3, allowing the sling body 3 to only extend and retract along the axial direction, limiting its circumferential torsion and radial sway, and reducing the torsion cause of the sling body 3 from the root. At the same time, the rubber soft edges on both sides of the guide groove 72 can buffer the friction between the sling body 3 and the groove wall, avoiding wear of the braided layer caused by local stress generated by the torsion tendency of the sling body 3.

[0050] The anti-torsion function of the reverse constraint force of the shape memory alloy spring 74: The shape memory alloy spring 74 is spirally wound in the mounting groove 73 of the guide sleeve 71, and its pitch is opposite to the twist direction of the sling body 3. When the sling body 3 is subjected to torsional force and undergoes circumferential torsion, the sling body 3 will drive the guide sleeve 71 to generate a circumferential rotation tendency in sync. Since the pitch of the shape memory alloy spring 74 is opposite to the twist direction of the sling body 3, the rotation of the guide sleeve 71 will squeeze the shape memory alloy spring 74, so that the shape memory alloy spring 74 generates an elastic constraint force (reverse torque) opposite to the twist direction of the sling body 3. This constraint force is transmitted to the sling body 3 through the guide sleeve 71, directly offsetting the torsional force of the sling body 3 and inhibiting further torsion of the sling body 3.

[0051] The two work together to prevent torsion. The guide groove 72 of the guide sleeve 71 restricts the radial sway and circumferential rotation tendency of the sling body 3, while the shape memory alloy spring 74 provides a reverse constraint force to counteract the torsional force of the sling body 3. The two work together to form a dual anti-torsion structure of "limiting + reverse constraint". At the same time, the adaptive stiffness adjustment function of the shape memory alloy spring 74 can adjust the magnitude of the constraint force according to the load change of the sling body 3. When the sling load is large (such as during landing impact), the spring stiffness increases, the constraint force is enhanced, and the anti-torsion effect is more stable. When the sling load is small (such as during stable hanging), the spring stiffness decreases, the constraint force is appropriately reduced, and excessive constraint is avoided to prevent wear of the sling body 3, thus achieving the dual effect of anti-torsion and protection.

[0052] The use of this device spans the entire process of the return capsule 1 from launch to on-orbit to return to landing. Its core functions are divided into four stages: storage state, deployment state, anti-torsion working state, and post-landing reset, as detailed below:

[0053] In the storage state (launch phase), before the return capsule 1 is launched, the sling body 3 is folded and stored in the storage slot 41 of the storage compartment 4. The anti-torsion arm 51 is folded and fits snugly against the sling body 3. The sliding body 14 is in the initial position under the action of the return spring 22. The wrapping body 12 is in a relaxed state. The flexible buffer component 7 is stored in the storage compartment 4 together with the sling body 3 to avoid the components being impacted and worn during the launch process, while reducing the overall space occupied by the device. At this time, the load sensor 23 is in standby state, monitoring the environmental stress in real time.

[0054] In the deployment state (return phase), when the return capsule 1 enters the return trajectory and prepares to land, the parachute inflates and deploys. The tension of the parachute pulls the sling body 3 slowly out of the storage slot 41 of the storage capsule 4. The sling body 3 gradually unfolds and is in a tensioned state. At the same time, the anti-torsion arm 51, under the action of its own weight and the tension of the sling, slowly unfolds around the spherical hinge seat 54 to the working position. The wrapping body 12 of the spherical hinge sleeve 10 gradually tightens and fits against the anti-torsion arm 51 under the action of the sliding body 14, realizing the initial limit of the anti-torsion arm 51. The connecting bracket 6 unfolds with the anti-torsion arm 51, driving the flexible buffer component 7 to unfold synchronously. The guide sleeve 71 remains coaxial with the sling body 3, the guide groove 72 fits against the sling body 3, and the memory alloy spring 74 is in a natural state, ready to play an anti-torsion role at any time.

[0055] In the anti-torsion working state (landing impact phase), when the return capsule 1 descends to the predetermined altitude and enters the suspended landing attitude, the sling body 3 bears the tension of the parachute and the weight of the return capsule 1, which easily leads to a circumferential torsion tendency. At this time, the anti-torsion mechanism starts to work. The guide groove 72 of the guide sleeve 71 first plays its role, limiting the radial sway and circumferential rotation tendency of the sling body 3, and preventing the sling body 3 from being torsiond by sway. If the sling body 3 has a slight torsion, it will drive the guide sleeve 71 to rotate synchronously. Since the pitch of the memory alloy spring 74 is opposite to the twist direction of the sling body 3, the memory alloy spring 74 is compressed, generating a reverse constraint force opposite to the torsion direction, which counteracts the torsional force of the sling body 3 and inhibits the further development of torsion. At the same time, the load sensor 23 collects the force data of the sling body 3 in real time. When the load on the sling changes, the sliding body 14 slides along the guide ring 19, squeezing the return spring 22 and the elastic compression plate 13, adjusting the wrapping force of the wrapping body 12 against the torsion arm 51, changing the swing damping of the anti-torsion arm 51, adapting to the change in sling load, and ensuring stable anti-torsion effect; the anti-torsion arm 51 avoids excessive swinging through the limiting effect of the ball joint seat 54, and works in conjunction with the flexible buffer component 7 to form a double anti-torsion protection, ensuring that the sling body 3 does not undergo large-scale torsion, avoiding the sling body 3 from getting tangled with the parachute lines, and ensuring the stability of the return capsule 1's attitude.

[0056] Post-landing reset (recovery phase): After the return capsule 1 successfully lands, the load on the sling body 3 gradually decreases, the shape memory alloy spring 74 returns to its natural state, the sliding body 14 resets under the action of the reset spring 22, the package body 12 returns to its relaxed state, the anti-torsion arm 51 can swing flexibly, and the staff can fold the sling body 3 and store it in the storage slot 41 of the recovery capsule 4. The anti-torsion arm 51 and the flexible buffer component 7 reset simultaneously, completing the entire usage process and facilitating the subsequent reuse of the device.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-torsion mechanism for a return capsule suspending sling, comprising a return capsule (1), a parachute-side connecting seat (2), and a sling body (3), wherein the top of the return capsule (1) is provided with a storage compartment (4), characterized in that: Multiple rigid connectors (5) are installed at equal angles inside the storage compartment (4) and at the bottom of the umbrella-side connecting seat (2); the rigid connector (5) includes an anti-torsion arm (51), and a crimping cavity (52) is opened inside the anti-torsion arm (51). The two ends of the sling body (3) are fixed in the crimping cavity (52) by high pressure crimping. A connecting bracket (6) is installed at the end of the anti-torsion arm (51) located in the storage compartment (4), and a flexible buffer assembly (7) is provided on the connecting bracket (6) and sleeved on the outside of the sling body (3). The flexible buffer assembly (7) includes a guide sleeve (71) connected to the connecting bracket (6). The inner wall of the guide sleeve (71) is provided with multiple sets of guide grooves (72) parallel to the axis of the sling body (3) at equal angles. The sling body (3) is embedded in the guide grooves (72). The guide sleeve (71) is provided with an installation groove (73) on its outside. A memory alloy spring (74) is provided at the installation groove (73). The pitch of the memory alloy spring (74) is opposite to the twist direction of the sling body (3) and is spirally wound around the outside of the guide sleeve (71).

2. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 1, characterized in that: The guide sleeve (71) is a thin-walled cylindrical tube, and the guide sleeve (71) is coaxially arranged with the sling body (3). Both ends of the guide sleeve (71) are provided with rounded anti-friction layers.

3. The anti-torsion mechanism for the suspending cable of the return capsule according to claim 2, characterized in that: The guide groove (72) on the inner wall of the guide sleeve (71) is in three sets. The two sides of the guide groove (72) are rubber soft edges, and the three sets of guide grooves (72) are evenly distributed in an arc shape on the outside of the sling body (3).

4. The anti-torsion mechanism for the suspending cable of the return capsule according to claim 1, characterized in that: The rigid connector (5) also includes a sling anchor cup (53); multiple mounting blocks (8) are installed inside the storage compartment (4) and at the bottom of the umbrella-side connecting seat (2). The lower part of the sling anchor cup (53) is fixed to the mounting block (8) by bolts (9). The upper part of the sling anchor cup (53) is provided with a spherical hinge seat (54). The bottom of the anti-torsion arm (51) is provided with a hinge ball (55). The hinge ball (55) is installed in the spherical hinge seat (54). A ball hinge sleeve (10) for limiting the swing amplitude of the anti-torsion arm (51) is installed on the spherical hinge seat (54).

5. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 4, characterized in that: The ball joint sleeve (10) includes a mounting ring (11) installed on the top of the ball joint seat (54), and the mounting ring (11) is provided with a wrapping body (12) wrapped around the outside of the anti-torsion arm (51); the wrapping body (12) is conical and has multiple elastic compression grooves.

6. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 5, characterized in that: The outer side of the package (12) is provided with a compression groove, and elastic compression pieces (13) are distributed in the compression groove; a sliding body (14) is sleeved on the outside of the package (12), and the sliding body (14) adjusts the tightness of the elastic compression groove by squeezing the elastic compression pieces (13) along the compression groove, thereby changing the wrapping force of the package (12) against the torsion arm (51).

7. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 6, characterized in that: The sliding body (14) includes a compression ring (15) sleeved on the outside of the package (12), and the compression ring (15) is provided with multiple contraction sections (16); a connecting rod (17) is connected to the outside of the compression ring (15), and a sliding sleeve (18) is provided at one end of the connecting rod (17); a guide ring (19) is provided on the inner wall of the storage compartment (4), and multiple elastic intervals (20) corresponding one-to-one with the package (12) are provided on the guide ring (19); the elastic interval (20) includes two limiting plates (21) fixedly installed on the inner wall of the storage compartment (4), the sliding sleeve (18) is sleeved on the guide ring (19), and a return spring (22) is provided between the outside of the sliding sleeve (18) and the limiting plate (21), and the return spring (22) is sleeved on the guide ring (19).

8. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 4, characterized in that: The connecting bracket (6) includes a bracket sleeve (61) sleeved on the outside of the anti-torsion arm (51), the bracket sleeve (61) is provided with an elastic compression sleeve (62), the top of the elastic compression sleeve (62) is provided with a mounting plate (63) for installing the guide sleeve (71), and the sling body (3) passes through the center position of the mounting plate (63).

9. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 1, characterized in that: The bottom of the spherical hinge seat (54) is provided with a load sensor (23), and the hinge ball (55) is in contact with the load sensor (23) to collect the force data of the sling body (3) in real time.

10. The anti-torsion mechanism for the suspending cable of a return capsule according to claim 1, characterized in that: The storage compartment (4) is provided with multiple storage slots (41) for storing the sling body (3), and the storage slots (41) are arranged one-to-one with the sling body (3).

Images