CN212243888U

CN212243888U - Secondary recovery landing mechanism of carrier rocket

Info

Publication number: CN212243888U
Application number: CN202020715637.XU
Authority: CN
Inventors: 彭小波; 郑立伟; 王永坤
Original assignee: Beijing Interstellar Glory Space Technology Co Ltd; Beijing Interstellar Glory Technology Co Ltd
Current assignee: Beijing Interstellar Glory Technology Co Ltd; Beijing Star Glory Space Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-12-29
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses a landing mechanism is retrieved to carrier rocket's sublevel, include: the shape-preserving support structures are arranged around the circumference of the arrow body, one end of each shape-preserving support structure is rotatably connected with the arrow body, and each shape-preserving support structure has a furled state which is furled on the outer surface of the arrow body when being locked by the initial locking structure and a landing support state which is unfolded outwards after the initial locking structure is unlocked; one end of the telescopic rod structure is hinged with the arrow body, and the other end of the telescopic rod structure is hinged with the shape-preserving support structure and comprises at least two sections of hollow supporting rods which are movably sleeved in sequence; and the interstage locking component is used for locking two adjacent sections of hollow supporting rods after the two sections of hollow supporting rods extend to the extreme position so that the telescopic rod structure, the shape-preserving supporting structure in the landing supporting state and the arrow body form a triangular framework. The retractable rod structure of the recovery landing mechanism can provide powerful and reliable support for the shape-preserving support structure, so that the sublevel of the carrier rocket can land stably, and guarantees are provided for the recovery and reutilization of the sublevel of the rocket and the reduction of launching cost.

Description

Secondary recovery landing mechanism of carrier rocket

Technical Field

The utility model relates to a carrier rocket retrieves technical field, concretely relates to carrier rocket's sublevel is retrieved and is landed mechanism.

Background

Space vehicles such as satellites, spaceships, star detectors and the like mainly rely on rocket to carry into space, and as the launching technology of the space vehicles is mature day by day, the requirements on the carrier rocket with high reliability and low cost are increasingly strong. As is well known, the launch vehicles used today are almost disposable vehicles, and transporting 1kg of objects into space requires approximately 1-2 million dollars, which makes the cost of space launch prohibitive.

The cost of a single flight in the aerospace field can be greatly reduced, precisely because of its reusability. The recovery and reuse of the launch vehicle is also an effective way to reduce launch costs. The rocket sublevel landing process is a crucial step for realizing rocket recovery.

The existing recovery landing mechanism has large air resistance when a rocket is launched, and the rocket body is possibly unstable along with the influence of first-order vibration due to large impact force peak value in the vertical landing process of the rocket, so that the recovery work fails.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the problem that the unstability easily takes place for too big impact force that the rocket sublevel among the prior art received when landing perpendicularly to retrieve to a landing mechanism is retrieved to sublevel of carrier rocket is provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a substage recovery landing mechanism for a launch vehicle, comprising:

an arrow body;

the plurality of shape-preserving support structures are arranged around the circumference of the arrow body, and one end of each shape-preserving support structure is rotationally connected with the arrow body around a first axis; the shape-preserving support structure has a folded state folded on the outer surface of the arrow body when being locked by an initial locking structure and a landing support state unfolded outwards after the initial locking structure is unlocked;

one end of the telescopic rod structure is hinged with the arrow body, and the other end of the telescopic rod structure is hinged with the shape-preserving support structure and comprises at least two sections of hollow support rods which are movably sleeved in sequence;

and the interstage locking component is arranged at the connecting node of two adjacent hollow supporting rods and used for locking the two adjacent hollow supporting rods after being stretched to the extreme position so that the telescopic rod structure, the shape-retaining supporting structure in the landing supporting state and the arrow body form a triangular framework.

Further, the interstage lock member includes:

the locking groove is arranged on the outer wall of one hollow supporting rod with a smaller pipe diameter;

the locking piece structure is connected with one hollow support rod with a larger pipe diameter, and when the two adjacent hollow support rods extend to the limit position, the locking piece structure extends into the locking groove to lock the two adjacent hollow support rods.

Furthermore, the end part of one hollow support rod with a larger pipe diameter is connected with a first connecting ring, and the inner wall surface of the first connecting ring is provided with an installation groove with an inward opening in the radial direction; the locking piece structure includes:

the locking block is connected in the mounting groove in a sliding manner along the radial direction of the telescopic rod structure and is at least partially extended out of the mounting groove so as to be matched with the locking groove to lock the extending state of two adjacent hollow support rods and the retracting state of the two adjacent hollow support rods retracted into the mounting groove;

the elastic piece is elastically connected between the bottom of the mounting groove and the locking piece, and the locking piece is driven by the elastic force of the elastic piece to extend out of the opening of the mounting groove.

Furthermore, the installation grooves are arranged at intervals along the circumferential direction of the first connecting ring; each mounting groove is internally provided with a locking block correspondingly.

Furthermore, the connecting surface between the first connecting ring and the hollow support rod with the larger pipe diameter is a wedge surface.

Furthermore, the outer wall of the hollow support rod with the smaller pipe diameter is further provided with a first protruding structure located on one side, close to the outside, of the lock groove, and the first protruding structure is used for being matched with one side, close to the outside, of the lock block structure to prevent the hollow support rod with the smaller pipe diameter from shrinking inwards.

Further, the interstage lock member further comprises:

and the sealing structure is sleeved at the end part of the hollow supporting rod with the larger pipe diameter and abuts against the hollow supporting rod with the smaller pipe diameter, and is used for sealing the gap between every two adjacent hollow supporting rods.

Further, the sealing structure includes:

the external member comprises a first lantern ring sleeved at the end part of one hollow supporting rod with a larger pipe diameter and a second lantern ring connected with the first lantern ring, wherein the inner wall of the second lantern ring is provided with an annular caulking groove with a radially inward opening;

and the sealing element is embedded in the annular caulking groove, and one end of the sealing element extending out of the annular caulking groove is tightly attached to the outer wall of the hollow supporting rod with a smaller pipe diameter.

Furthermore, one hollow strut with a smaller pipe diameter comprises a rod body and a second connecting ring connected to the rod body, and the locking groove and the first protruding structure are formed in the outer wall of the second connecting ring.

Furthermore, the connecting surface between the second connecting ring and the rod body is a wedge surface, and the inner wall of the second connecting ring and the inner wall of the rod body jointly form the inner wall of the hollow support rod.

Furthermore, the hollow supporting rod with the smaller pipe diameter is positioned on the outer wall of the inner part of the hollow supporting rod with the larger pipe diameter, and a second protruding structure is arranged on the outer wall of the inner part of the hollow supporting rod.

Furthermore, a thrust piece is connected to the arrow body; the telescopic end of the thrust piece is connected with the shape-keeping support structure, and the thrust piece is used for driving the shape-keeping support structure to rotate from the furled state to the landing support state; the telescopic rod structure realizes the relative sliding of the hollow support rods in the rotating process of the shape-preserving support structure.

Furthermore, a groove is formed in the inward side of the shape-preserving support structure; when the shape-keeping supporting structure is in the furled state, the telescopic rod structure is embedded in the groove.

Furthermore, the initial locking structure is also embedded in the groove, and the connection between the initial locking structure and the shape-preserving support structure is detachable.

Furthermore, the shape of the outward side of the shape-preserving support structure is streamline.

Furthermore, in the circumferential direction of the arrow body, the shape-preserving support structure is a pneumatic shape with two low ends and a high middle part; in the axial flight direction of the arrow body, the shape-preserving support structure is in a pneumatic shape with a sharp front end and a wide back end.

Furthermore, in the telescopic rod structure, a first section of support rod is connected with the arrow body, and a last section of support rod is connected with the shape-preserving support structure; and an oil-gas buffer is connected between the end part of the tail section supporting rod and the shape-preserving supporting structure.

Furthermore, the shape-preserving support structure and the telescopic rod structure are both made of carbon fiber materials.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a landing mechanism is retrieved to substage of carrier rocket, when the substage of carrier rocket was in the stage before the landing of ascending segment and descending segment, a plurality of shape-preserving supporting structures were in the state of drawing in, and attached at the surface of the rocket body for the rectification and protection rocket body internal mechanism do not receive the thermal current interference; when the substage of the carrier rocket moves to the landing section, the initial locking structure releases the locking of the shape-preserving support structure, the shape-preserving support structure is unfolded outwards around the first axis, and the landing support state is moved from the folded state, so that the rocket body can land stably; meanwhile, in the process that the telescopic rod structure rotates along with the shape-preserving support structure, on one hand, the telescopic rod structure rotates around an upper rotating shaft on the arrow body, on the other hand, the relative sliding of the hollow support rods at all levels is realized, and the telescopic rod structure is matched with the unfolding process of the shape-preserving support structure; when the telescopic rod structure moves to the extreme position, the interstage locking part locks two adjacent sections of hollow supporting rods, so that the telescopic rod structure becomes a rigid rod, a stable triangular structure is formed among the arrow body, the shape-preserving supporting structure and the telescopic rod structure, the telescopic rod structure can provide powerful and reliable support for the shape-preserving supporting structure, the stability of the shape-preserving supporting structure during landing is further improved, and the stability of the arrow body during vertical landing and recovery is further improved.

2. When two adjacent hollow struts stretch to the limit position, the elastic piece of the locking block structure on one hollow strut with larger pipe diameter drives the locking block to stretch into the locking groove on the outer wall of one hollow strut with smaller pipe diameter, so that interstage locking of the two adjacent hollow struts is realized; the interstage locking component is simple in structure and high in reliability, and interstage locking of the telescopic rod structure can be automatically achieved.

3. The utility model provides a carrier rocket's sublevel is retrieved landing mechanism installs the lock piece structure at first connecting ring, then connects first connecting ring to be located the structure on the tip of a hollow branch that the pipe diameter is great, compares with the mode of directly processing the mounting groove and installing the lock piece structure at the inner wall of hollow branch, on the one hand processing preparation is more convenient; on the other hand, the part of the hollow support rod provided with the locking block structure needs to bear larger pressure relative to other parts, so that the requirements on the structural strength and the thickness of the part are higher, and the self weight of the telescopic rod structure can be reduced as much as possible under the condition of meeting the requirements on the structural strength of each part of the telescopic rod structure by the mode of separately manufacturing the first connecting ring and the hollow support rod.

4. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, a plurality of mounting grooves are followed the mode that the even interval of circumference direction of go-between set up, and all correspond the structure that is provided with a locking piece in every mounting groove, not only can make the locking between two adjacent hollow branch more firm, can also make the uniformity in clearance between two adjacent hollow branch higher to ensure the leakproofness of telescopic link structure after the locking between the grades.

5. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, the connection face between first connecting ring and the hollow strut is the form of wedge face, can increase area of connection between them to improve the connection reliability of first connecting ring.

6. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, the structure that mutually supports is mutually supported to the first protruding structure of the outer wall of a less hollow branch of pipe diameter and locking piece structure, can prevent that a less hollow branch of pipe diameter from inwards contracting to it is better to improve the locking effect of stage locking part between stage.

7. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, because need set up gas generator in the telescopic link structure to gaseous promotion telescopic link structure that produces through gas generator stretches out in order to keep telescopic link structure's rigid state, the setting of seal structure between two adjacent hollow branch can ensure telescopic link structure and stretching out the gas tightness of in-process, thereby ensure that telescopic link structure can keep stabilizing the rigid state, provide reliable and stable supporting role for the landing of the arrow body.

8. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, sealing member inlay and establish in the annular caulking groove of external member, and with the structure of closely laminating of a less hollow branch of pipe diameter, the mounting structure stability of sealing member is high, can ensure the gas tightness of telescopic link structure at flexible in-process.

9. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, because hollow branch offers the position of locked groove and first protruding structure other positions relatively and need bear bigger pressure, consequently higher to the requirement of this position structural strength and thickness, the mode of second go-between and hollow branch separately preparation can alleviate telescopic link structure's self weight as far as possible under the requirement that satisfies each position structural strength of telescopic link structure.

10. The utility model provides a landing mechanism is retrieved to substage of carrier rocket, the connection face between second go-between and the hollow branch is the form of wedge face, can increase the connection area between the two to improve the connection reliability of second go-between; the inner wall of the second connecting ring and the inner wall of the rod body jointly form a structure of the inner wall of the hollow support rod, the whole thickness of the hollow support rod can be reduced as much as possible under the requirement of ensuring the structural strength of each part of the hollow support rod, and therefore the self weight of the telescopic rod structure is reduced.

11. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, the protruding structure of second on the hollow branch outer wall plays the guide effect to the concertina movement of hollow branch, can ensure that hollow branch is concertina movement along its axis direction, reduces the influence of hollow branch motion erroneous tendency to the telescopic link structure closure.

12. The utility model provides a sub-grade recovery landing mechanism of a carrier rocket, a shape-preserving support structure is outwards unfolded around a first axis under the action of a thrust piece, and the rocket body can land stably by moving a landing support state from a furled state; meanwhile, in the rotating process of the telescopic rod structure along with the shape-preserving support structure, on one hand, the telescopic rod structure rotates around an upper rotating shaft on the arrow body, on the other hand, the relative sliding of the hollow support rods at all levels is realized and is matched with the unfolding process of the shape-preserving support structure, and therefore the unfolding process of the shape-preserving support structure is orderly carried out.

13. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel sets up the recess that supplies telescopic link structure and initial locking structure isotructure to bury underground in a side of type bearing structure inwards, can reduce the occupation space that the mechanism was retrieved in the landing.

14. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel, initial locking structure can dismantle the form of connecting in guarantor type bearing structure, and it is more convenient to dismantle the change, also makes things convenient for the performance to initial locking structure alone to test.

15. The utility model provides a sub-grade recovery landing mechanism of a carrier rocket, in the circumferential direction of a rocket body, a shape-preserving support structure is in a pneumatic shape with two low ends and a high middle part; in the axial flying direction of the arrow body, the shape-preserving support structure is in a pneumatic shape with a sharp front and a wide back; the shape-preserving support structure with the pneumatic shape can reduce the resistance of the recovery landing mechanism in the rising process and can also reduce the resistance of the descending rocket body in the recovery process.

16. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel sets up oil gas formula buffer on telescopic link structure's end branch, promotes according to the pneumatic principle of oil gas formula buffer, can alleviate telescopic link structure's dead weight effectively to alleviate rocket and retrieve landing device's whole weight.

17. The utility model provides a landing mechanism is retrieved to carrier rocket's sublevel adopts the guarantor type bearing structure and the telescopic link structure's that carbon fiber material made branch at all levels, has advantages such as intensity height, heat-resisting impact resistance are good, matter light, can effectively alleviate rocket and retrieve landing device's whole weight, strengthens the carrying capacity of rocket.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of the present invention before landing for substage recovery of a launch vehicle;

FIG. 2 is a schematic view of an embodiment of the present invention during a launch vehicle substage recovery landing;

FIG. 3 is a schematic structural view of a shape-preserving support structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of the telescopic rod structure in the embodiment of the present invention;

fig. 5 is a longitudinal section structure diagram of the telescopic rod structure in the embodiment of the present invention;

FIG. 6 is an enlarged view taken at A in FIG. 5;

FIG. 7 is a cross-sectional view of the telescoping pole structure of FIG. 5 taken in longitudinal cross-section to show the internal structure of the inter-stage locking member;

fig. 8 is an enlarged view at B in fig. 7.

Description of reference numerals: 1. an arrow body; 2. a shape-preserving support structure; 21. a groove; 3. a telescopic rod structure; 31. A hollow strut; 4. an initial locking configuration; 5. an interstage lock member; 6. a thrust member; 7. an oil-gas type buffer; 8. an upper rotating shaft; 9. a lower rotating shaft; 51. a first connecting ring; 511. mounting grooves; 52. a second connection ring; 521. locking the groove; 522. a first bump structure; 53. a locking block; 54. an elastic member; 55. a kit; 551. A first collar; 552. a second collar; 553. an annular caulking groove; 56. a seal member; 57. and a second bump structure.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The substage recovery landing mechanism of a launch vehicle shown in fig. 1 and 2 comprises a shape-retaining support structure 2, an initial locking structure 4, a telescopic rod structure 3 and an interstage locking part 5. Wherein, four shape-preserving support structures 2 are uniformly arranged around the arrow body 1 at intervals, and one end of each shape-preserving support structure is rotationally connected with the arrow body 1 around the lower rotating shaft 9; the shape-retaining support structure 2 has a collapsed state collapsed on the outer surface of the arrow body 1 when locked by the initial locking structure 4 and a landing support state expanded outward after the initial locking structure 4 is unlocked. One end of the telescopic rod structure 3 is rotatably connected to the arrow body 1 around the upper rotating shaft 8, and the other end is hinged to one end of the shape-preserving support structure 2 far away from the lower rotating shaft 9. The telescopic rod structure 3 comprises at least two hollow supporting rods 31 which are movably sleeved in sequence, and the interstage locking part 5 is arranged at the connecting node of two adjacent hollow supporting rods 31. The interstage locking part 5 is used for locking two adjacent sections of hollow supporting rods 31 after extending to the extreme position, so that the telescopic rod structure 3, the shape-preserving supporting structure 2 in the landing supporting state and the arrow body 1 form a triangular framework.

According to the recovery landing mechanism, when the substages of the carrier rocket are in the stage before landing of the ascending section and the descending section, the four shape-preserving support structures 2 are in a folded state and attached to the outer surface of the rocket body 1 and are used for rectifying and protecting the internal mechanism of the rocket body 1 from heat flow interference; when the substage of the carrier rocket moves to a landing section, the initial locking structure 4 releases the locking of the shape-preserving support structure 2, the shape-preserving support structure 2 is unfolded outwards around the lower rotating shaft 9, and the landing support state is moved from the folded state, so that the rocket body 1 can land stably; meanwhile, in the process that the telescopic rod structure 3 rotates along with the shape-preserving support structure 2, on one hand, the telescopic rod structure rotates around the upper rotating shaft 8 on the arrow body 1, and on the other hand, the relative sliding of the hollow support rods 31 at all levels is realized and is matched with the unfolding process of the shape-preserving support structure 2; when the telescopic rod structure 3 moves to the extreme position, the interstage locking part 5 locks the two adjacent sections of the hollow supporting rods 31, so that the telescopic rod structure 3 becomes a rigid rod, a stable triangular structure is formed among the arrow body 1, the shape-preserving supporting structure 2 and the telescopic rod structure 3, the telescopic rod structure 3 can provide powerful and reliable support for the shape-preserving supporting structure 2, the stability of the shape-preserving supporting structure 2 during landing is further improved, and the reliability of the arrow body 1 in the vertical landing recovery process is further improved.

As shown in fig. 2, in this embodiment, the arrow body 1 is further connected with a thrust member 6, one end of the thrust member 6 connected with the arrow body 1 is a fixed end of the thrust member 6, and a telescopic end of the thrust member 6 is hinged to the shape-preserving support structure 2. The shape-preserving support structure 2 is unfolded outwards around the lower rotating shaft 9 under the action of the thrust piece 6 and moves from a folded state to a landing support state, so that the arrow body 1 can land stably; meanwhile, in the rotating process of the telescopic rod structure 3 along with the shape-preserving support structure 2, on one hand, the telescopic rod structure rotates around the upper rotating shaft 8 connected with the arrow body 1, on the other hand, the relative sliding of the hollow support rods 31 at all levels is realized, and the telescopic rod structure can be matched with the unfolding process of the shape-preserving support structure 2, so that the unfolding process of the shape-preserving support structure 2 is orderly carried out.

As shown in fig. 2 and 3, in the present embodiment, a groove 21 is formed on the inward side of the shape-retaining support structure 2; when the shape-preserving support structure 2 is in a folded state, the telescopic rod structure 3 and the initial locking structure 4 are embedded in the groove 21. The telescopic rod structure 3, the initial locking structure 4 and other structures are arranged in an embedded mode, so that the occupied space of the landing recovery mechanism can be reduced. Preferably, the initial locking structure 4 can realize initial locking operation and resetting operation through an operation hole, and the initial locking structure 4 is an independent module and is detachably connected to the shape-preserving support structure 2, and can be independently tested and replaced. In particular, the initial locking structure 4 may be an explosive bolt.

Referring to fig. 1, 2 and 3, in this embodiment, the outward side of the shape-preserving support structure 2 is streamlined. In the circumferential direction of the arrow body 1, the shape-preserving support structure 2 is in a pneumatic shape with two low ends and a high middle part; in the axial flying direction of the arrow body 1, the shape-preserving support structure 2 is in an aerodynamic shape with a sharp front and a wide back. The shape-preserving support structure 2 with the aerodynamic shape can reduce the resistance of the recovery landing mechanism in the rising process and can also reduce the resistance of the descending rocket body 1 in the recovery process.

As shown in fig. 4, in the telescopic rod structure 3 in the present embodiment, the first section of strut is connected to the arrow body 1, and the last section of strut is connected to the shape-retaining support structure 2; an oil-gas type buffer 7 is connected between the end part of the last section of the supporting rod and the shape-preserving supporting structure 2. The oil-gas type buffer 7 is arranged on the tail section supporting rod of the telescopic rod structure 3, and the self weight of the telescopic rod structure 3 can be effectively reduced by pushing according to the pneumatic principle of the oil-gas type buffer 7, so that the whole weight of the rocket recovery landing device is reduced.

As shown in fig. 5 to 8, in the present embodiment, the inter-stage locking member 5 includes a locking groove 521 and a locking piece structure. Wherein, the locking piece structure is seted up on the outer wall of a hollow branch that the pipe diameter is less in two adjacent hollow branches 31, and the locking piece structure is connected in a hollow branch that the pipe diameter is great. When two adjacent hollow struts 31 extend to the limit position, the locking block structure on one hollow strut with a larger pipe diameter extends into the locking groove 521 on the outer wall of one hollow strut with a smaller pipe diameter, so that interstage locking of the two adjacent hollow struts 31 is realized; the interstage locking component 5 is simple in structure and high in reliability, and interstage locking of the telescopic rod structure 3 can be automatically achieved.

Referring to fig. 6 and 8, in a specific embodiment of the present embodiment, a first connecting ring 51 is connected to an end of a hollow strut with a larger pipe diameter, and an inner wall surface of the first connecting ring 51 is provided with a mounting groove 511 with an opening facing radially inward. The locking piece structure includes a locking piece 53 slidably coupled in the mounting groove 511 in a radial direction of the telescopic rod structure 3 and an elastic member 54 elastically coupled between the bottom of the mounting groove 511 and the locking piece 53 and having an elastic force for urging the locking piece 53 to protrude out of the opening of the mounting groove 511. The locking piece 53 is at least partially extended out of the mounting slot 511 under the elastic force of the elastic member 54 to cooperate with the locking slot 521 to lock the extended state of the two adjacent hollow struts 31 and the retracted state retracted into the mounting slot 511 under the pushing of the external force. Compared with the mode of directly processing the mounting groove 511 on the inner wall of the hollow strut 31 and mounting the locking block structure, on one hand, the locking block structure is more convenient to process and manufacture; on the other hand, the part of the hollow strut 31 where the locking block structure is installed needs to bear larger pressure than other parts, so that the requirements on the structural strength and thickness of the part are higher, and the first connecting ring 51 and the hollow strut 31 are manufactured separately, so that the self weight of the telescopic rod structure 3 can be reduced as much as possible under the condition that the requirements on the structural strength of each part of the telescopic rod structure 3 are met. Specifically, the elastic member 54 is a spring; the first connecting ring 51 and the locking block 53 are made of titanium alloy materials; the hollow strut 31 is made of a carbon fiber material. In other embodiments, the locking piece structure can also be directly arranged in a hollow support rod with a larger pipe diameter, and the locking piece structure can also be replaced by an elastic block with elasticity.

As shown in fig. 5 and fig. 6, in the present embodiment, a gas generator (not shown) is disposed in the telescopic rod structure 3, the gas generator generates gas to push the telescopic rod structure 3 to extend so as to maintain the extended rigid state of the telescopic rod structure 3, and the interstage locking member 5 further includes a sealing structure sleeved on an end of a hollow strut with a larger pipe diameter. One end of the sealing structure is abutted against one hollow supporting rod with a smaller pipe diameter and used for sealing a gap between two adjacent hollow supporting rods 31. The sealing structure can ensure the air tightness of the telescopic rod structure 3 in the extending process, so that the telescopic rod structure 3 can be ensured to be in a stable and rigid state, and a stable and reliable supporting effect is provided for the landing of the arrow body 1.

Specifically, the seal structure includes a sleeve 55 and a seal 56. The sleeve 55 comprises a first collar 551 sleeved on the end of a hollow strut with a larger pipe diameter and a second collar 552 connected to the first collar 551, wherein the inner wall of the second collar 552 is provided with an annular caulking groove 553 with a radially inward opening; the sealing member 56 is embedded in the annular embedding groove 553, and one end of the sealing member extending out of the annular embedding groove 553 is tightly attached to the outer wall of a hollow strut with a smaller pipe diameter. Specifically, the sealing element 56 is made of rubber, flexible sealing gasket, etc., as long as the sealing element 56 can seal the gap between the second collar 552 and a hollow strut with a small diameter without completely obstructing the relative movement of the two.

In the present embodiment, as shown in fig. 6, the connection surface between the first connection ring 51 and one of the hollow struts having a larger diameter is a wedge surface. The wedge-shaped connection surface can increase the connection area of the first connection ring 51 and the hollow leg, thereby improving the connection reliability of the first connection ring 51.

As shown in fig. 6, in this embodiment, the outer wall of one hollow strut with a smaller pipe diameter is further provided with a first protrusion structure 522 located at the outer side of the locking groove 521, and the first protrusion structure 522 can cooperate with the outer side of the locking block structure to prevent the one hollow strut with a smaller pipe diameter from contracting inwards, so as to improve the locking effect of the interstage locking member 5. Specifically, the first protrusion structure 522 is a first boss protruding from the outer wall of a hollow strut with a smaller pipe diameter; in the telescopic process of the telescopic rod structure 3, a first oblique guide surface is arranged on one side of the first boss opposite to the locking block 53, and a second oblique guide surface matched with the first oblique guide surface in shape is arranged on the locking block 53. The arrangement of the first inclined guide surface and the second inclined guide surface is convenient for the first boss and the locking block 53 to push the locking block 53 to contract into the mounting groove 511 in the relative movement process, and after the thrust of the first boss to the locking block 53 disappears, the locking block 53 can better extend into the locking groove 521 under the action of the elastic piece 54, so that the locking of the positions of the first boss and the locking block is realized. Further, the second collar 552 has a stop that cooperates with the first raised structure 522 to at least partially limit a hollow strut having a smaller diameter to a hollow strut having a larger diameter. The stopper end may stopper the first protrusion structure 522 from the other side surface, thereby improving the reliability of the inter-stage locking member 5.

In this embodiment, a hollow strut with a smaller diameter comprises a rod body and a second connecting ring 52 connected to the rod body, and the locking groove 521 and the first protrusion 522 are formed on the outer wall of the second connecting ring 52. Because the part of the hollow strut 31 provided with the locking groove 521 and the first protruding structure 522 needs to bear larger pressure than other parts, the requirement on the structural strength and thickness of the part is higher, and the self weight of the telescopic rod structure 3 can be reduced as much as possible under the condition of meeting the requirement on the structural strength of each part of the telescopic rod structure 3 by separately manufacturing the second connecting ring 52 and the hollow strut 31. Specifically, the second connection ring 52 is made of a titanium alloy material; the body portion of the hollow strut 31 is made of a carbon fiber material.

As shown in fig. 7 and 8, in the present embodiment, a plurality of installation grooves 511 are uniformly arranged along the circumferential direction of the first connecting ring 51 at intervals, and each installation groove 511 is correspondingly provided with a locking block 53 therein; the interstage locking member 5 comprising the plurality of locking pieces 53 not only can firmly lock the two adjacent hollow struts 31, but also can ensure the consistency of the gap between the two adjacent hollow struts 31, thereby ensuring the sealing performance of the telescopic rod structure 3 after interstage locking.

As shown in fig. 6 and 8, the connecting surface of the second connecting ring 52 and the shaft portion of the hollow shaft 31 is a wedge surface, and the inner wall of the second connecting ring 52 and the inner wall of the shaft portion together form the inner wall of the hollow shaft 31. The wedge-shaped connection surface may increase a connection area between the second connection ring 52 and the rod body, thereby improving connection reliability of the second connection ring 52. Specifically, the two sides of the second connection ring 52 are provided with wedge surfaces matching with the rod body.

As shown in fig. 7, in the present embodiment, a hollow strut with a smaller pipe diameter is provided with a second protrusion structure 57 on the outer wall of the hollow strut with a larger pipe diameter. The second protruding structure 57 guides the telescopic motion of the hollow supporting rod 31, so that the telescopic motion of the hollow supporting rod 31 along the axis direction thereof can be ensured, and the influence of the movement deviation of the hollow supporting rod 31 on the sealing performance of the telescopic rod structure 3 can be reduced.

In the present embodiment, the struts of the shape-retaining support structure 2 and the telescopic rod structure 3 are made of carbon fiber material, and the first connecting ring 51, the locking block structure, the second connecting ring 52, the sleeve 55, etc. as the components of the interstage locking structure are made of titanium alloy material. The carbon fiber material has the advantages of high strength, good heat and impact resistance, light weight and the like, and can effectively reduce the overall weight of the rocket recovery landing device and enhance the carrying capacity of the rocket. The titanium alloy has high strength and good heat resistance, and can ensure the stability of the interstage locking structure.

To sum up, the landing mechanism for the secondary recovery of the carrier rocket provided by the embodiment of the present invention is that the landing mechanism for the primary recovery of the carrier rocket is attached to the surface of the rocket body 1 (as shown in fig. 1) under the effect of the shape-preserving support structure 2 before the ascending section and the descending section of the carrier rocket reach the landing, and the shape-preserving support structure 2 mainly plays a role in rectifying and protecting the internal mechanism from the interference of heat flow in the process; before the rocket sublevel lands, the initial unlocking structure is opened, the shape-preserving support structure 2 rotates around the lower rotating shaft 9 under the action of the thrust piece 6, the telescopic rod structure 3 rotates around the upper rotating shaft 8, and meanwhile, all levels of support rods of the telescopic rod structure 3 slide relatively. When the shape-preserving support structure 2 moves to the end position, the telescopic rod structure 3 also moves to the extreme position, so that the telescopic rod structure 3 becomes a rigid rod, a stable triangular structure is formed among the arrow body 1, the shape-preserving support structure 2 and the telescopic rod structure 3, and the telescopic rod structure 3 can provide powerful and reliable support for the shape-preserving support structure 2, so that the sublevel of the carrier rocket can land stably and provide powerful support. The recovery landing mechanism solves the problem of secondary recovery after the first-stage separation of the carrier rocket, and can stably fall back to a ground recovery field during the first-stage landing after the second-stage separation of the carrier rocket, thereby realizing the reutilization of first-stage products, reducing the cost and providing guarantee for shortening the production and launching periods.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A substage recovery landing gear for a launch vehicle, comprising:

an arrow body (1);

a plurality of shape-preserving support structures (2) are arranged around the circumference of the arrow body (1), and one end of each shape-preserving support structure is rotationally connected to the arrow body (1) around a first axis; the shape-retaining support structure (2) has a folded state folded on the outer surface of the arrow body (1) when being locked by an initial locking structure (4) and a landing support state unfolded outwards after the initial locking structure (4) is unlocked;

one end of the telescopic rod structure (3) is hinged with the arrow body (1), and the other end of the telescopic rod structure is hinged with the shape-preserving support structure (2), and the telescopic rod structure comprises at least two sections of hollow support rods (31) which are movably sleeved in sequence;

and the interstage locking component (5) is arranged at the connecting node of two adjacent hollow struts (31) and is used for locking two adjacent hollow struts (31) which extend to the extreme position so that the telescopic rod structure (3), the shape-retaining support structure (2) in the landing support state and the arrow body (1) form a triangular framework.

2. A substage recovery landing mechanism for a launch vehicle according to claim 1, characterised in that the interstage locking member (5) comprises:

the locking groove (521) is arranged on the outer wall of one hollow support rod (31) with a smaller pipe diameter;

the locking piece structure is connected to one hollow support rod with a large pipe diameter, and when two adjacent hollow support rods (31) are extended to limit positions, the locking piece structure extends into the locking groove (521) to lock the two adjacent hollow support rods (31).

3. A substage recovery landing gear for a launch vehicle according to claim 2, wherein a first connecting ring (51) is connected to the end of one of said hollow struts having a larger diameter, and the inner wall surface of said first connecting ring (51) is provided with a mounting groove (511) having a radially inward opening; the locking piece structure includes:

the locking block (53) is connected in the mounting groove (511) in a sliding manner along the radial direction of the telescopic rod structure (3), and at least part of the locking block extends out of the mounting groove (511) to be matched with the locking groove (521) to lock the extending state of two adjacent hollow struts (31) and the retracting state of the locking block retracting into the mounting groove (511);

and the elastic piece (54) is elastically connected between the bottom of the mounting groove (511) and the locking block (53), and the elastic force drives the locking block (53) to extend out of the opening of the mounting groove (511).

4. A substage recovery landing gear for a launch vehicle according to claim 3, wherein said mounting slots (511) are plural and arranged at regular intervals in the circumferential direction of said first connecting ring (51); each mounting groove (511) is internally and correspondingly provided with a locking block (53).

5. A substage recovery landing gear for a launch vehicle according to claim 3, wherein the connection surface between said first connection ring (51) and one of said hollow struts having a larger diameter is a wedge surface.

6. A substage recovery landing gear for a launch vehicle according to claim 3, wherein the outer wall of said hollow strut with a smaller diameter is further provided with a first protrusion (522) located at the outer side of said locking slot (521), said first protrusion (522) being adapted to cooperate with the outer side of said locking block structure to prevent the hollow strut with a smaller diameter from contracting inwardly.

7. A substage recovery landing mechanism for a launch vehicle according to claim 2, characterised in that the interstage locking member (5) further comprises:

and the sealing structure is sleeved at the end part of the hollow supporting rod with the larger pipe diameter and abuts against the hollow supporting rod with the smaller pipe diameter, and is used for sealing the gap between every two adjacent hollow supporting rods (31).

8. The substage recovery landing mechanism of a launch vehicle of claim 7, wherein the sealing structure comprises:

the sleeve piece (55) comprises a first sleeve ring (551) sleeved at the end of one hollow strut with a larger pipe diameter and a second sleeve ring (552) connected to the first sleeve ring (551), wherein the inner wall of the second sleeve ring (552) is provided with an annular caulking groove (553) with an opening facing radially inwards;

and the sealing element (56) is embedded in the annular embedding groove (553), and one end of the sealing element, which extends out of the annular embedding groove (553), is tightly attached to the outer wall of one hollow support rod with a smaller pipe diameter.

9. A substage recovery landing gear for a launch vehicle according to claim 6, wherein said one of said hollow struts having a smaller diameter comprises a rod body and a second coupling ring (52) connected to said rod body, said locking groove (521) and said first protrusion (522) being formed on an outer wall of said second coupling ring (52).

10. A launch vehicle substage recovery landing gear according to claim 9, characterised in that the connection surface between said second connection ring (52) and said rod is a wedge surface, the inner walls of said second connection ring (52) and said rod together constituting the inner walls of said hollow struts (31).

11. A launch vehicle substage recovery landing gear according to claim 2, wherein a second raised formation (57) is provided on the outer wall of one of said hollow struts of smaller diameter located inside one of said hollow struts of larger diameter.

12. A substage recovery landing gear for a launch vehicle according to any of claims 1 to 11, characterised in that a thrust member (6) is also attached to the rocket body (1); the telescopic end of the thrust piece (6) is connected with the shape-preserving support structure (2), and the thrust piece (6) is used for driving the shape-preserving support structure (2) to rotate from the furled state to the landing support state; the telescopic rod structure (3) realizes the relative sliding of the hollow support rods (31) in the rotation process of the shape-preserving support structure (2).

13. A substage recovery landing gear for a launch vehicle according to any of claims 1 to 11, characterised in that the inward facing side of the shape-retaining support structure (2) is provided with a recess (21); when the shape-keeping supporting structure (2) is in the folded state, the telescopic rod structure (3) is embedded in the groove (21).

14. A substage-recovery landing gear for a launch vehicle according to claim 13, characterised in that said initial locking structure (4) is also embedded in said recess (21) and in that the connection between said initial locking structure (4) and said shape-retaining support structure (2) is a detachable connection.

15. A substage recovery landing gear for a launch vehicle according to any of claims 1 to 11, characterised in that the outward facing side of the shape-retaining support structure (2) is streamlined.

16. A substage recovery landing gear for a launch vehicle according to claim 15, characterised in that in the circumferential direction of the rocket body (1) the shape-retaining support structure (2) is of a low-end, high-middle aerodynamic profile; in the axial flight direction of the arrow body (1), the shape-preserving support structure (2) is of a pneumatic shape with a sharp front end and a wide rear end.

17. A substage recovery landing gear for a launch vehicle according to any of claims 1 to 11, characterised in that in said telescopic rod structure (3) the first strut is connected to said rocket body (1) and the last strut is connected to said shape-retaining support structure (2); an oil-gas type buffer (7) is connected between the end part of the tail section supporting rod and the shape-preserving supporting structure (2).

18. A substage recovery landing gear for a launch vehicle according to any of claims 1 to 11, characterised in that said shape-retaining support structure (2) and said telescopic rod structure (3) are both made of carbon fibre material.