Landing auxiliary support leg beam body sandwich structure and landing auxiliary support leg device

Abstract

The present application relates to the field of aerospace technology, and discloses a landing auxiliary support leg beam body sandwich structure and a landing auxiliary support leg device.The landing auxiliary support leg beam body sandwich structure comprises a beam body, the beam body comprises an outer shell body and a foam sandwich body, the outer shell body is a hollow structure, the foam sandwich body is located in the outer shell body, a plurality of first reinforcing ribs and a plurality of second reinforcing ribs are arranged between the foam sandwich body and the outer shell body, and the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged in a staggered manner.The present application also discloses a landing auxiliary support leg device, which comprises a landing disc, a cross beam and two beam bodies, the landing disc is located at the top of the intersection end of the two symmetrically arranged beam bodies, and the cross beam is located between the two symmetrically arranged beam bodies, and the landing auxiliary support leg device has the characteristics of high bearing strength and light weight.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, and in particular to a landing auxiliary leg beam sandwich structure and a landing auxiliary leg device. Background Technology

[0002] Currently, launch vehicles can be reused after cleaning, repair, and testing, effectively reducing space launch costs and achieving the goal of rocket recovery. Landing legs are one of the key technologies for rocket recovery. The rocket's return stage has high kinetic energy before landing, and a strong impact is generated upon contact with the landing platform. The landing legs bear the impact load during the rocket's landing. However, the quality requirements for landing legs are stringent, needing to meet the strength and stiffness requirements of the auxiliary landing legs while minimizing their mass. Currently, the fabrication of the main load-bearing beam for landing legs faces challenges such as the heavy weight of metal materials, complex forming processes, and long manufacturing cycles.

[0003] Therefore, it is necessary to propose a sandwich structure for the landing auxiliary leg beam and a landing auxiliary leg device to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide a landing auxiliary leg beam sandwich structure and a landing auxiliary leg device, which has strong load-bearing capacity and light weight.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A landing auxiliary support leg beam sandwich structure includes a beam body, wherein the beam body includes an outer shell and a foam sandwich body;

[0007] The outer shell is a hollow structure, and the foam core is located inside the outer shell. A plurality of first reinforcing ribs and a plurality of second reinforcing ribs are provided between the foam core and the outer shell, and the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged alternately.

[0008] As a preferred embodiment of the landing support leg beam sandwich structure, a plurality of first reinforcing ribs are spaced apart along the length direction of the beam body, and the first reinforcing ribs are annular and arranged between the foam sandwich body and the outer shell body; a plurality of second reinforcing ribs are spaced apart along the circumference of the beam body, and the length direction of the second reinforcing ribs extends along the length direction of the beam body.

[0009] As a preferred embodiment of a landing support leg beam sandwich structure, along the length of the foam sandwich body, a plurality of first annular grooves are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body, and each first reinforcing rib is placed in one of the first annular grooves; along the circumference of the foam sandwich body, a plurality of second strip grooves are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body, each of the second strip grooves communicates with all the first annular grooves, and each second reinforcing rib is placed in one of the second strip grooves.

[0010] As a preferred embodiment of the landing support leg beam sandwich structure, a clearance groove is provided at the intersection of the second strip groove and the first annular groove. The intersection of the first reinforcing rib and the second reinforcing rib is bent and accommodated in the clearance groove, or the intersection of the second reinforcing rib and the first reinforcing rib is bent and accommodated in the clearance groove.

[0011] As a preferred embodiment of the landing support leg beam sandwich structure, each of the first reinforcing ribs is alternately woven and laid with all of the second reinforcing ribs.

[0012] As a preferred embodiment of the landing support leg beam sandwich structure, the density of the foam sandwich body is 100-160 kg / m³. 3 .

[0013] As a preferred embodiment of the landing support leg beam sandwich structure, the outer shell is made of carbon fiber composite material.

[0014] A method for manufacturing a landing support leg beam sandwich structure, the method comprising:

[0015] Prepare the first foam sandwich structure;

[0016] Along the length of the first foam sandwich body, a plurality of parallel first annular grooves are machined on the outer periphery of the first foam sandwich body. Along the circumference of the first foam sandwich body, a plurality of spaced parallel second strip grooves are machined on the outer periphery of the first foam sandwich body. At the junction of each second strip groove and each first annular groove, a relief groove is deepened and provided.

[0017] Each first reinforcing rib is placed in a first annular groove, each second reinforcing rib is placed in a second strip groove, and the intersection of each first reinforcing rib and the second reinforcing rib or the intersection of each second reinforcing rib and the first reinforcing rib is pressed into a relief groove to form a second foam sandwich body.

[0018] The landing auxiliary leg beam sandwich structure is obtained by winding carbon fiber filaments around the second foam core or by laying carbon fiber cloth on the second foam core.

[0019] A landing support leg device includes a landing plate, a crossbeam, and two beam bodies as described in any one of the above;

[0020] The landing disk is located at the top of the intersection of the two V-shaped beam bodies, and the landing disk is connected to the beam bodies through a first metal embedded part;

[0021] The crossbeam is located between the two beam bodies and is connected to the two beam bodies by a second metal embedded part.

[0022] As a preferred embodiment of a landing support leg device, the cross-section of the beam body is rectangular.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention provides a landing auxiliary outrigger beam sandwich structure. The structure includes a beam body, which comprises an outer shell and a foam sandwich body located within the outer shell. This structure is characterized by its light weight, simple molding, and low manufacturing cost. Furthermore, by incorporating multiple interlaced first and second reinforcing ribs between the foam sandwich body and the outer shell, the strength and rigidity of the beam body are enhanced, thereby improving its load-bearing capacity. In addition, using a foam sandwich body reduces mold investment, saving costs and shortening the manufacturing cycle.

[0025] This invention also provides a landing auxiliary leg device, which includes a landing disk, a crossbeam, and two beam bodies. The landing disk is located at the top of the intersection of the two symmetrically arranged beam bodies, and the crossbeam is located between the two symmetrically arranged beam bodies. This landing auxiliary leg device meets the requirements of high load-bearing capacity and light weight, and also features simple structure, simple molding, short manufacturing cycle, and low development cost, and has been applied in rocket recovery. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the landing auxiliary outrigger device provided in an embodiment of the present invention;

[0028] Figure 2This is a schematic diagram of the circumferential cross-section of the beam body provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the groove on the side of the foam sandwich body provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the heat-resistant outer shell provided in an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Beam body; 11. Outer shell; 12. Foam sandwich body; 121. First annular groove; 122. Second strip groove; 123. Clearance groove; 13. First reinforcing rib; 14. Second reinforcing rib;

[0033] 2. Landing disk;

[0034] 3. Crossbeam;

[0035] 4. Heat-resistant outer shell;

[0036] 5. Ear. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0041] like Figures 1 to 3 As shown, this embodiment provides a landing auxiliary outrigger beam sandwich structure. This structure includes a beam body 1, which comprises an outer shell 11 and a foam sandwich body 12. The outer shell 11 is hollow, and the foam sandwich body 12 is located inside it. Multiple first reinforcing ribs 13 and multiple second reinforcing ribs 14 are arranged between the foam sandwich body 12 and the outer shell 11, and these ribs are staggered. By incorporating the outer shell 11 and the foam sandwich body 12 within the beam body 1, the beam body 1 achieves lightweight, simple molding, and low manufacturing costs. Furthermore, the staggered arrangement of the multiple first reinforcing ribs 13 and multiple second reinforcing ribs 14 between the foam sandwich body 12 and the outer shell 11 enhances the strength and rigidity of the beam body 1, thereby improving its load-bearing capacity. In addition, using the foam sandwich body 12 reduces mold investment, saving costs and shortening the manufacturing cycle.

[0042] Furthermore, multiple first reinforcing ribs 13 are spaced apart along the length of the beam body 1, and the first reinforcing ribs 13 are annular, arranged between the foam sandwich body 12 and the outer shell 11. Multiple second reinforcing ribs 14 are spaced apart circumferentially along the beam body 1, and the length of the second reinforcing ribs 14 extends along the length of the beam body 1. The interlaced first reinforcing ribs 13 and second reinforcing ribs 14 between the foam sandwich body 12 and the outer shell 11 enhance the overall strength and stiffness of the beam body 1, giving the beam body 1 excellent load-bearing capacity in both the circumferential and longitudinal directions.

[0043] Preferably, the first reinforcing rib 13 and the second reinforcing rib 14 are perpendicular to each other. At this time, the connection strength between the first reinforcing rib 13 and the second reinforcing rib 14 is optimal, so that the load-bearing capacity of the beam body 1 is optimal. Of course, in other embodiments, the first reinforcing rib 13 and the second reinforcing rib 14 can also be arranged at an angle, depending on the actual situation.

[0044] Specifically, along the length direction of the foam sandwich body 12, i.e. the length direction of the beam body 1, a plurality of first annular grooves 121 are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body 12. Each first reinforcing rib 13 is placed in one of the first annular grooves 121. The arrangement of the first annular grooves 121 facilitates the fixation of the position of the first reinforcing rib 13, preventing the first reinforcing rib 13 from moving and affecting the strength and stiffness of the beam body 1. Along the circumference of the foam sandwich body 12, a plurality of second strip grooves 122 are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body 12. Each second strip groove 122 communicates with all the first annular grooves 121. Each second reinforcing rib 14 is placed in one of the second strip grooves 122. The arrangement of the second strip grooves 122 facilitates the fixation of the position of the second reinforcing rib 14, preventing the second reinforcing rib 14 from moving and affecting the strength and stiffness of the beam body 1.

[0045] More specifically, a clearance groove 123 is provided at the junction of the second strip groove 122 and the first annular groove 121. The intersection of the first reinforcing rib 13 and the second reinforcing rib 14 is bent and accommodated in the clearance groove 123. At this time, at the intersection of the first reinforcing rib 13 and the second reinforcing rib 14, the first reinforcing rib 13 is located on the side closer to the clearance groove 123 and is bent, that is, the intersection of the first reinforcing rib 13 and the second reinforcing rib 14 is arched, and the arched part is located in the clearance groove 123; or the intersection of the second reinforcing rib 14 and the first reinforcing rib 13 is bent and accommodated in the clearance groove 123. At this time, at the intersection of the second reinforcing rib 14 and the first reinforcing rib 13, the second reinforcing rib 14 is located on the side closer to the clearance groove 123 and is bent, that is, the intersection of the second reinforcing rib 14 and the first reinforcing rib 13 is arched, and the arched part is located in the clearance groove 123. To avoid interference between the first reinforcing rib 13 and the second reinforcing rib 14, the first reinforcing rib 13 and the second reinforcing rib 14 can be completely accommodated in the first annular groove 121 and the second strip groove 122, while avoiding the first reinforcing rib 13 and the second reinforcing rib 14 from protruding relative to the foam sandwich body 12, thus ensuring the flatness of the overall structure.

[0046] Preferably, the first reinforcing rib 13 and the second reinforcing rib 14 are carbon fiber composite materials, which have excellent mechanical properties and enhance the load-bearing capacity of the beam body 1.

[0047] Furthermore, each first reinforcing rib 13 is alternately woven and laid with all the second reinforcing ribs 14, so that the intersection of each first reinforcing rib 13 and all the second reinforcing ribs 14 presents an alternating weave of structures such as: the first reinforcing rib 13 is located on the second reinforcing rib 14, the second reinforcing rib 14 is located on the first reinforcing rib 13, and the first reinforcing rib 13 is located on the second reinforcing rib 14. This laying method enhances the connection strength between the first reinforcing ribs 13 and the second reinforcing ribs 14, further preventing the first reinforcing ribs 13 and the second reinforcing ribs 14 from falling off and moving from the first annular groove 121 and the second strip groove 122 respectively, thereby enhancing the load-bearing capacity of the beam body 1.

[0048] Specifically, the outer shell 11 is made of carbon fiber composite material, which is prepared by winding or laying carbon fiber composite material around the foam sandwich 12. It is preferably a composite molding of T700 carbon fiber and epoxy resin, which has excellent mechanical properties, giving the beam body 1 excellent load-bearing capacity.

[0049] Specifically, the density of the foam sandwich 12 is 100-160 kg / m³. 3 The preferred density is 140 kg / m³. 3 The foam was selected based on a comprehensive consideration of the required high-temperature resistance, load-bearing capacity, and overall mass indicators of the landing support legs. Because maintaining high-temperature resistance was necessary, the foam density could not be too low, but too high a density would result in excessive mass. Therefore, a density of 140 kg / m³ was preferred. 3 To meet the required requirements.

[0050] This embodiment provides a method for manufacturing a sandwich structure of a landing auxiliary support leg beam, the method comprising:

[0051] S100: Prepare the first foam sandwich structure;

[0052] Specifically, the first foam core is made of foam core material, preferably a columnar structure.

[0053] S200: Along the length of the first foam sandwich body, a plurality of parallel first annular grooves 121 are machined on the outer periphery of the first foam sandwich body. Along the circumferential direction of the first foam sandwich body, a plurality of spaced parallel second strip grooves 122 are machined on the outer periphery of the first foam sandwich body. A relief groove 123 is deepened at the communication point between each second strip groove 122 and each first annular groove 121.

[0054] S300: Each first reinforcing rib 13 is placed in a first annular groove 121, and each second reinforcing rib 14 is placed in a second strip groove 122. The intersection of each first reinforcing rib 13 and the second reinforcing rib 14 or the intersection of each second reinforcing rib 14 and the first reinforcing rib 13 is pressed into a relief groove 123 to form a second foam sandwich body.

[0055] Specifically, at the intersection of the first reinforcing rib 13 and the second reinforcing rib 14, the first reinforcing rib 13 is located on the side closer to the relief groove 123 and is bent, that is, the intersection of the first reinforcing rib 13 and the second reinforcing rib 14 is arched, and the arched part is located in the relief groove 123; or the intersection of the second reinforcing rib 14 and the first reinforcing rib 13 is bent and accommodated in the relief groove 123, in which case the second reinforcing rib 14 is located on the side closer to the relief groove 123 and is bent, that is, the intersection of the second reinforcing rib 14 and the first reinforcing rib 13 is arched, and the arched part is located in the relief groove 123. To avoid interference between the first reinforcing rib 13 and the second reinforcing rib 14, the first reinforcing rib 13 and the second reinforcing rib 14 can be completely accommodated in the first annular groove 121 and the second strip groove 122, while avoiding the first reinforcing rib 13 and the second reinforcing rib 14 from protruding relative to the foam sandwich body 12, thus ensuring the flatness of the overall structure.

[0056] Preferably, the first annular groove 121 and the second strip groove 122 are perpendicular to each other. Of course, in other embodiments, the first annular groove 121 and the second strip groove 122 can also be arranged at an angle, depending on the actual situation. That is, the first reinforcing rib 13 and the second reinforcing rib 14 are perpendicular to each other. At this time, the connection strength between the first reinforcing rib 13 and the second reinforcing rib 14 is optimal, so that the load-bearing capacity of the landing auxiliary support leg beam sandwich structure is optimal. Of course, in other embodiments, the first reinforcing rib 13 and the second reinforcing rib 14 can also be arranged at an angle, depending on the actual situation.

[0057] More preferably, each first reinforcing rib 13 is alternately woven with all the second reinforcing ribs 14, such that the intersection of each first reinforcing rib 13 and all the second reinforcing ribs 14 presents an alternating weave of structures such as the first reinforcing rib 13 being located on the second reinforcing rib 14, the second reinforcing rib 14 being located on the first reinforcing rib 13, and the first reinforcing rib 13 being located on the second reinforcing rib 14. This laying method enhances the connection strength between the first reinforcing ribs 13 and the second reinforcing ribs 14, further preventing the first reinforcing ribs 13 and the second reinforcing ribs 14 from falling off and moving from the first annular groove 121 and the second strip groove 122 respectively, thereby enhancing the load-bearing capacity of the beam body 1.

[0058] S400: Carbon fiber filaments are wound around the second foam core, or carbon fiber cloth is laid on the second foam core to obtain a landing auxiliary leg beam sandwich structure.

[0059] Specifically, the carbon fiber filaments or carbon fiber cloth are both carbon fiber composite materials, preferably T700 carbon fiber and epoxy resin composite molding, which have excellent mechanical properties, giving the beam body 1 excellent load-bearing capacity.

[0060] This embodiment also provides a landing auxiliary leg device, which includes a landing disk 2, a crossbeam 3, and two beam bodies 1. The landing disk 2 is located at the top of the intersection of the two V-shaped beam bodies 1, and is connected to the beam bodies 1 via a first metal embedded part. The crossbeam 3 is located between the two beam bodies 1, and is connected to the two beam bodies 1 via a second metal embedded part. This landing auxiliary leg device structure meets the requirements of high load-bearing capacity and light weight, and also has the characteristics of simple structure, simple molding, short manufacturing cycle, and low development cost, and has been applied in rocket recovery.

[0061] Specifically, the crossbeam 3 is made of composite material or aluminum alloy, which has the characteristics of strong load-bearing capacity and light weight.

[0062] Furthermore, the cross-section of the beam body 1 is a rectangular section. The size of the section is determined according to the axial tensile and compressive loads borne by the auxiliary support leg. A rectangular section with a large bending section modulus is selected, and the specific dimensions of the section are determined according to finite element analysis. At the same time, the rectangular section is easy to form.

[0063] Specifically, the landing auxiliary leg device also includes two lugs 5, which are located at one end of two symmetrically arranged beam bodies 1 opposite to the landing disk 2. One end of the lug 5 is connected to the beam body 1 through a third embedded part, and the other end is hinged to a metal lug on the rocket body section.

[0064] Preferably, the first, second, and third embedded metal parts are connected in the landing auxiliary outrigger device by adhesive bonding or screw bonding, which is convenient to operate and has a better connection effect.

[0065] Optionally, such as Figure 4 As shown, the landing auxiliary outrigger device also includes a heat-resistant outer shell 4, which is fitted onto the landing disk 2, the crossbeam 3 and the beam body 1. The heat-resistant outer shell 4 is connected to the side of the beam body 1 by screws. The heat-resistant outer shell 4 is made of fiberglass, which has a better heat protection effect and improves the heat protection performance of the landing auxiliary outrigger device.

[0066] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for manufacturing a sandwich structure for a landing auxiliary support leg beam, characterized in that, The landing auxiliary leg beam sandwich structure includes a beam body, which includes an outer shell and a foam sandwich body; The outer shell is a hollow structure, the foam sandwich body is located inside the outer shell, and a plurality of first reinforcing ribs and a plurality of second reinforcing ribs are provided between the foam sandwich body and the outer shell, and the plurality of first reinforcing ribs and the plurality of second reinforcing ribs are arranged alternately. Multiple first reinforcing ribs are spaced apart along the length of the beam body, and the first reinforcing ribs are annular and arranged between the foam sandwich body and the outer shell body; multiple second reinforcing ribs are spaced apart along the circumference of the beam body, and the length of the second reinforcing ribs extends along the length of the beam body. Along the length of the foam sandwich body, a plurality of first annular grooves are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body, and each first reinforcing rib is placed in one of the first annular grooves; along the circumference of the foam sandwich body, a plurality of second strip grooves are arranged parallel to each other at intervals on the outer periphery of the foam sandwich body, each of the second strip grooves communicates with all the first annular grooves, and each second reinforcing rib is placed in one of the second strip grooves; A clearance groove is provided at the point where the second strip groove communicates with the first annular groove. The intersection of the first reinforcing rib and the second reinforcing rib is bent and accommodated in the clearance groove, or the intersection of the second reinforcing rib and the first reinforcing rib is bent and accommodated in the clearance groove. Each of the first reinforcing ribs is alternately woven and laid with all of the second reinforcing ribs; The density of the foam sandwich body is 100-160 kg / m³ 3 ; The outer shell is made of carbon fiber composite material; The manufacturing method includes the following steps: Prepare the first foam sandwich structure; Along the length of the first foam sandwich body, a plurality of parallel first annular grooves are machined on the outer periphery of the first foam sandwich body. Along the circumference of the first foam sandwich body, a plurality of spaced parallel second strip grooves are machined on the outer periphery of the first foam sandwich body. At the junction of each second strip groove and each first annular groove, a relief groove is deepened and provided. Each first reinforcing rib is placed in a first annular groove, each second reinforcing rib is placed in a second strip groove, and the intersection of each first reinforcing rib and the second reinforcing rib or the intersection of each second reinforcing rib and the first reinforcing rib is pressed into a relief groove to form a second foam sandwich body. The landing auxiliary leg beam sandwich structure is obtained by winding carbon fiber filaments around the second foam core or by laying carbon fiber cloth on the second foam core.

2. A landing auxiliary leg device, characterized in that, It includes a landing disk, a crossbeam, and two landing auxiliary leg beam sandwich structures manufactured using the manufacturing method of the landing auxiliary leg beam sandwich structure as described in claim 1; The landing disk is located at the top of the intersection of the two V-shaped beam bodies, and the landing disk is connected to the beam bodies through a first metal embedded part; The crossbeam is located between the two beam bodies and is connected to the two beam bodies by a second metal embedded part.

3. The landing auxiliary outrigger device according to claim 2, characterized in that, The cross-section of the beam body is rectangular.

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