Interstage separation explosive bolt buffer box assembly structure and spacecraft

Abstract

This invention provides a stage-separated explosive bolt buffer box assembly structure and spacecraft in the field of buffer structure technology, including a base plate and a buffer box, with the buffer box located on one side of the base plate. Lugs are welded to the inner wall of the buffer box, with stress grooves provided at the roots of the lugs. A taper is provided between the side of the nut and the inner wall of the buffer box. A buffer honeycomb is provided inside the buffer box, and a top cover plate is provided on the buffer honeycomb. A circular notch is provided in the center of the top cover plate. This invention uses an integral casting method to create a unified structure for the base plate and the buffer box, facilitating the installation of other large equipment within the cabin. By using lugs welded to the inner wall of the buffer box to provide support for the installation of the nut, and utilizing the stress grooves at the roots of the lugs to provide additional impact buffering, the overall buffering performance is improved. The circular notch secures the bolt after the explosive bolt impact is released, preventing the bolt from popping out of the buffer box mounting hole and preventing the risk of it protruding from the cabin.

Description

Technical Field

[0001] This invention relates to the field of buffer structure technology, specifically to an interstage separation explosive bolt buffer box assembly structure and a spacecraft. Background Technology

[0002] Explosive bolts, as a simple and efficient separation and unlocking solution, are commonly used for inter-stage separation. During explosive separation, one end of the bolt head is fixed, while the other end of the bolt flies out at high speed in the opposite direction under the force of the explosion. To avoid impacting equipment inside the compartment, a buffer box is typically used to absorb energy at the bolt end. Existing inter-stage separation buffer boxes are generally directly installed on the docking surface base plate via screw connections or welding. The buffer material inside the box only provides cushioning, which has two shortcomings: first, the buffer box, as an independent component, has limited strength and rigidity when assembled and connected to the compartment, and its ability to withstand large impacts is insufficient; second, after separation, there is a risk that the bolt may eject from the buffer box mounting hole and protrude from the compartment.

[0003] A search of existing technologies revealed that Chinese utility model patent publication number CN210853002U discloses a buffer box for a spacecraft separation device. The buffer box includes a buffer body with holes for connecting components to pass through, an internal accommodating space, and a sloped bottom. A buffer block is located in the accommodating space, positioned on the sloped surface, and fixedly connected to it. This utility model suffers from the aforementioned problems of insufficient impact resistance and the screw potentially popping out of the buffer box mounting hole and protruding from the spacecraft body. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an interstage separation explosive bolt buffer box assembly structure and a spacecraft.

[0005] According to the present invention, an interstage separation explosive bolt buffer box assembly structure includes a base plate and a buffer box, wherein the buffer box is located on one side of the base plate, the buffer box and the base plate are integrated into one structure, and the integrated structure formed by the buffer box and the base plate is manufactured by integral casting.

[0006] The inner wall of the buffer box is welded with an ear piece, a stress groove is provided at the root of the ear piece, and the ear piece supports a nut. The side of the nut is tapered with respect to the inner wall of the buffer box.

[0007] The buffer box is provided with a buffer honeycomb, and the buffer honeycomb is provided with an upper cover plate, and the upper cover plate has a circular notch in the center.

[0008] In some embodiments, the four end faces of the buffer honeycomb are attached to the inner sidewall of the buffer box, the top of the buffer honeycomb is bonded to the upper cover plate, and the bottom of the buffer honeycomb is bonded to the lower cover plate.

[0009] In some embodiments, the taper adjusts the fit clearance between the side of the nut and the inner wall of the buffer box, and the taper constrains the translational and rotational movements of the nut.

[0010] In some embodiments, a through hole is provided around the edge of the bottom plate, and the through hole corresponds to the connection interface between the bottom plate and the cabin.

[0011] In some implementations, the buffer box is connected to the cover plate by screws.

[0012] In some embodiments, the buffer box has a threaded hole on its protruding end face, which is used to connect it to the cabin body, thereby improving the overall rigidity of the buffer box and reducing the amount of deformation when subjected to separation impact.

[0013] In some embodiments, the nut is connected to a screw, and the diameter of the circular notch is larger than the outer diameter of the screw.

[0014] In some embodiments, the top of the buffer box is provided with a second through hole.

[0015] A spacecraft comprising the aforementioned interstage separation explosive bolt buffer box assembly structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention adopts an integral casting method for the base plate and the buffer box to form an integrated structure, which can be installed last before the cabin is closed, facilitating the installation of other large equipment in the cabin;

[0018] 2. This invention provides support for the installation of the nut by welding ear pieces to the inner wall of the buffer box. Based on the buffer honeycomb structure inside the buffer box, the stress groove at the root of the ear piece is broken and the frictional resistance between the nut and the inner wall of the buffer box is used to provide additional buffering against impact, thereby improving the overall buffering performance.

[0019] 3. The present invention has a circular notch machined in the center of the upper cover plate. The circular notch is used to lock the screw after the explosive bolt is unlocked by impact, which prevents the screw from popping out of the buffer box mounting hole and prevents the risk of protruding out of the cabin. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1This is a schematic diagram of the overall structure of the interstage separation explosive bolt buffer box assembly structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the buffer box structure of the interstage separation explosive bolt buffer box assembly structure of the present invention.

[0023] Figure label:

[0024] Base plate 1, taper 51

[0025] Through hole 11, top cover plate 6

[0026] Buffer box 2, circular notch 61

[0027] Threaded hole 21, buffer honeycomb 7

[0028] Through hole 22, lower cover plate 8

[0029] Cover plate 3, Ear piece 9

[0030] Screw 4, Stress Groove 91

[0031] Nut 5 Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] Example 1

[0034] like Figure 1-2 As shown, the present invention includes a base plate 1 and a buffer box 2. The buffer box 2 is located on one side of the base plate 1, and the buffer box 2 and the base plate 1 are integrally structured. Ears 9 are welded to the inner wall of the buffer box 2. Stress grooves 91 are provided on the ears 9, and the ears 9 support nuts 5. A taper 51 is provided between the side of the nut 5 and the inner wall of the buffer box 2. A buffer honeycomb 7 is provided inside the buffer box 2, and an upper cover plate 6 is provided on the buffer honeycomb 7. A circular notch 61 is provided in the center of the upper cover plate 6.

[0035] During assembly, the ear piece 9 is first welded to the inner wall of the buffer box 2, and the buffer honeycomb 7 is bonded to the upper cover plate 6 and the lower cover plate 8 respectively. Then, the nut 5 and the buffer honeycomb 7 are installed inside the buffer box 2 in sequence. The bottom plate 1 and the buffer box 2 are connected as one piece by integral casting. The buffer box 2 is then connected to the cover plate 3 by screws 4.

[0036] In practical use, this invention first uses screws to connect the integrated structure of the buffer box 2 and the base plate 1 to the corresponding threaded holes on the boss at the end face of the cabin using through holes 11 arranged around the edge of the base plate 1. After the connection is completed, screws are used to connect the threaded holes 21 on the protruding end face of the buffer box 2 to the corresponding countersunk holes on the cabin wall, thus completing the assembly of the cabin. During the docking of the compartments, the bolts of the explosion bolts are screwed into the nuts 5 through the through holes 22 above the buffer box 2 to lock the docking position.

[0037] Example 2

[0038] A spacecraft comprising the interstage separation explosive bolt buffer box assembly structure of Embodiment 1.

[0039] Working principle:

[0040] This invention features lugs 9 welded to the inner wall of the buffer box 2, with stress grooves 91 formed at the base of the lugs 9. The lugs 9 provide support for the nuts 4 during installation, facilitating the screwing of the explosive bolts into the integrated structure of the buffer box 2 and the base plate 1, enabling docking with the aft stage after the forward compartment is closed. When the explosive bolts are released, the stress grooves 91 at the base of the lugs 9 break under the impact of the bolts and nuts 5, thus buffering part of the impact.

[0041] This invention features a small taper 51 between the side of the nut 5 and the inner wall of the buffer box 2. During use, this taper 51 adjusts the fit clearance between them: when the nut 5 is installed, it has a clearance fit with the inner wall of the buffer box 2, meaning the nut 5 is close to the upper surface of the buffer box 2, facilitating installation. When the nut 5 is installed, it falls freely a short distance and contacts the lug 9, at which point it has a transition fit with the inner wall of the buffer box 2. This constrains the translational and rotational movement of the nut 5, allowing the bolt to be smoothly screwed into the integrated structure of the buffer box 2 and the base plate 1. During the separation and unlocking process of the bolt, the nut 5 continues to move downwards under the impact of separation, becoming an interference fit with the inner wall of the buffer box 2. Frictional resistance reduces the impact speed of the nut 5 after separation, thus providing a buffering effect.

[0042] This invention features a circular notch 61 machined at the center of the upper cover plate 6, with the diameter of the notch slightly larger than the outer diameter of the explosive bolt's shank. During the separation and unlocking process of the explosive bolt, as the shank protrudes from the end face of the nut 5, it first enters the circular notch 61. Immediately afterwards, the nut 5 impacts the upper cover plate 6, causing the circular notch 61 on the upper cover plate 6 to deform and jam the explosive bolt's shank. This prevents the explosive bolt's shank from rebounding when it impacts the bottom of the buffer box 2, thus preventing it from popping out of the mounting hole and protruding from the cabin.

[0043] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, 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 this application.

[0044] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A stage-separated explosive bolt buffer box assembly structure, characterized in that, It includes a base plate (1) and a buffer box (2), the buffer box (2) is located on one side of the base plate (1), and the buffer box (2) and the base plate (1) are integrated into one structure; The inner wall of the buffer box (2) is welded with an ear piece (9), the ear piece (9) is provided with a stress groove (91), and the ear piece (9) supports a nut (5). A taper (51) is provided between the side of the nut (5) and the inner wall of the buffer box (2). The buffer box (2) is provided with a buffer honeycomb (7), and the buffer honeycomb (7) is provided with an upper cover plate (6). The upper cover plate (6) has a circular notch (61) in the center. The lug (9) provides support for the nut (5) during installation. When the explosive bolt is unlocked, the stress groove (91) at the root of the lug (9) breaks under the impact of the bolt and nut (5), thus buffering part of the impact. When the nut (5) is installed, it is in clearance fit with the inner wall of the buffer box (2), and at this time the nut (5) is close to the upper surface of the buffer box (2); When the nut (5) is installed, it falls freely for a distance and comes into contact with the ear (9). At this time, it is in transition fit with the inner wall of the buffer box (2) to constrain the translational and rotational movement of the nut (5) so that the screw of the explosion bolt can be smoothly screwed into the integrated structure of the buffer box (2) and the base plate (1). During the process of separating and unlocking the explosive bolt, the nut (5) continues to move downward under the impact of separation, and becomes an interference fit with the inner wall of the buffer box (2). The frictional resistance reduces the impact speed of the nut (5) after separation, thus playing a buffering role. During the process of separating and unlocking the explosive bolt, since the screw protrudes from the end face of the nut (5), the screw first enters the circular notch (61), and then the nut (5) hits the upper cover plate (6), causing the circular notch (61) on the upper cover plate (6) to deform and jam the screw of the explosive bolt, preventing the screw of the explosive bolt from rebounding when it hits the bottom of the buffer box (2), popping out of the mounting hole and protruding out of the cabin.

2. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The buffer honeycomb (7) is attached to the inner wall of the buffer box (2) on all four sides. The top of the buffer honeycomb (7) is connected to the upper cover plate (6), and the bottom of the buffer honeycomb (7) is connected to the lower cover plate (8).

3. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The taper (51) adjusts the fit clearance between the side of the nut (5) and the inner wall of the buffer box (2), and the taper (51) constrains the translational and rotational movements of the nut (5).

4. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The bottom plate (1) has a through hole (11) around its edge.

5. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The buffer box (2) is connected to the cover plate (3) by screws (4).

6. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The buffer box (2) has a threaded hole (21) on its protruding end face.

7. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The nut (5) is connected to a screw, and the diameter of the circular notch (61) is larger than the outer diameter of the screw.

8. The interstage separation explosive bolt buffer box assembly structure according to claim 1, characterized in that, The top of the buffer box (2) is provided with a through hole two (22).

9. A spacecraft, characterized in that, Includes the interstage separation explosive bolt buffer box assembly structure according to any one of claims 1-8.

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