Explosive bolt cushioning and damping assembly

Abstract

This utility model relates to an explosive bolt damping and shock absorption assembly, which has an internal accommodating space for installing explosive bolts. The explosive bolt damping and shock absorption assembly includes: a main body; and a pad, which is fixed to a first side of the main body by adhesive. The explosive bolt damping and shock absorption assembly further includes: a second baffle, which is fixed to a second side of the main body by adhesive; a first sponge rubber plate located on the side of the second baffle opposite to the main body, and the first sponge rubber plate is fixed to the second baffle by adhesive; and a first baffle located on the side of the first sponge rubber plate opposite to the second baffle, and the first baffle is fixed to the first sponge rubber plate by adhesive. The main body is made of honeycomb panel, and a second sponge rubber plate is provided on the inner wall of the accommodating space. This damping and shock absorption assembly has a simple structure, is easy to process and manufacture, and can effectively solve the problems of difficult installation and low reliability of damping and shock absorption assemblies in actual use.

Description

Technical Field

[0001] This utility model relates to an explosive bolt buffer and shock absorption assembly, which is used for explosive bolts on rockets. Background Technology

[0002] Launch vehicles typically include components such as multiple stages and fairings. Some stages and fairings detach from the rocket body at different stages of flight. Explosive bolts are often used to connect and secure the different parts at the separation surfaces. During flight, when a part (such as a stage or fairing) needs to detach from the rocket body, the explosive bolts will detonate at an appropriate time based on signals from the control system, unlocking the separation surfaces and allowing that part to detach.

[0003] Because explosive bolts have free ends after breaking, and these free ends are susceptible to movement due to the impact of the explosion, posing a threat to the rocket's structure and the normal operation of the equipment, explosive bolts are often used in conjunction with shock-absorbing structures. For example, in patent document CN 106143954A, a vibration-damping honeycomb structure and a sleeve are provided on the outer side of the explosive bolt's end to reduce the separation impact of the free end when the explosive bolt breaks. The vibration-damping honeycomb structure and the sleeve are respectively fixed to the rocket body around the explosive bolt by additional screws.

[0004] In recent years, with the increasing demand for domestic launch payloads, the size of some structures that need to be separated (such as fairings) has been continuously increasing, and the impulse of the explosive bolts used upon detonation has also been increasing. Furthermore, the locations used to install explosive bolts are often in confined spaces or have complex shapes. Conventional cushioning materials are often difficult to install due to their large size, or insufficient to provide effective cushioning and shock absorption due to their small size. Currently, optimization of cushioning components generally suffers from increased parts and cumbersome production and assembly processes. In addition, too many components can reduce reliability and fail to meet the growing safety requirements of explosive bolts. Utility Model Content

[0005] To address the problems in existing technologies, this utility model provides an explosion bolt damping and shock absorption assembly. This damping and shock absorption assembly has a simple structure, is easy to manufacture, and effectively solves the problems of difficult installation and low reliability in actual use of damping and shock absorption assemblies.

[0006] This utility model provides an explosive bolt buffer and shock absorption assembly, which has an internal receiving space for installing explosive bolts. The explosive bolt buffer and shock absorption assembly includes: a main body; and a pad, which is fixed to a first side of the main body by an adhesive. The explosive bolt buffer and shock absorption assembly further includes: a second baffle, which is fixed to a second side of the main body by the adhesive; a first sponge rubber plate, which is located on the side of the second baffle opposite to the main body, and the first sponge rubber plate is fixed to the second baffle by the adhesive; and a first baffle, which is located on the side of the first sponge rubber plate opposite to the second baffle, and the first baffle is fixed to the first sponge rubber plate by the adhesive. The main body is made of a honeycomb panel, and a second sponge rubber plate is provided on the inner wall surface of the receiving space.

[0007] The explosion bolt damping assembly of this invention has a simple structure. Except for the need to machine the accommodating space to match the shape of the explosion bolt, the machining of other shapes and dimensions is very easy. Even if the entire damping assembly needs a special or complex shape, it can be achieved through mold design. Therefore, the entire damping assembly is easy to manufacture.

[0008] In this invention's explosive bolt damping and shock absorption assembly, the various components are fixed to each other with adhesive, thus eliminating the need for additional fixing components such as screws. This explosive bolt damping and shock absorption assembly allows for the arrangement of as many damping and shock absorption components as possible within a limited installation space, resulting in high space utilization and making it particularly suitable for situations where installation space around explosive bolts is limited. The adhesive fixing of this damping and shock absorption assembly is simple to operate and requires no special tools, thus offering the advantages of easy and quick installation in actual operation.

[0009] In the explosive bolt buffer and shock absorption assembly of this invention, a second sponge rubber plate is also provided inside the main body made of a honeycomb panel. If the free end of the explosive bolt directly impacts the honeycomb panel, it can easily lead to uneven local stress, resulting in uneven crushing of the honeycomb panel after being subjected to stress. With the second sponge rubber plate provided, the second sponge rubber plate acts as the first-level buffer, and the honeycomb panel acts as the second-level buffer. The free end generated by the explosion is first blocked by the second sponge rubber plate, absorbing a portion of the impact. The remaining impact is transferred to the honeycomb panel through the second sponge rubber plate and absorbed thereafter. Therefore, this two-level buffer structure can improve the uneven stress distribution on the honeycomb panel, making the entire buffer and shock absorption assembly have a more reliable buffering and shock absorption effect.

[0010] Preferably, when the explosive bolt buffer and shock absorption assembly is assembled to the explosive bolt, the detonating cord of the explosive bolt will pass through the area covered by the second sponge rubber plate.

[0011] The material properties of the second sponge rubber plate can be used to fit well against the inner wall of the slot, forming a closed enveloping area with the surrounding structure, thus preventing the detonating cord from slipping out of the buffer assembly.

[0012] Preferably, the adhesive is HY914 structural adhesive.

[0013] HY914 structural adhesive is a commonly used adhesive in the aerospace field. It can exhibit the advantages of rapid curing and high bonding strength on materials such as aluminum and sponge rubber used in this invention.

[0014] Preferably, the honeycomb panel is made of aluminum.

[0015] Aluminum honeycomb panels can be shaped using conventional machining or cast into complex forms using molds, making their manufacturing process simple. Furthermore, aluminum honeycomb panels can absorb a large amount of impact energy when crushed and retain a relatively intact shape after crushing, significantly reducing debris buildup and preventing damage to other structures and equipment on the rocket during separation.

[0016] Preferably, both the first sponge rubber sheet and the second sponge rubber sheet are sponge rubber sheets conforming to the HG6-413 standard.

[0017] The HG6-413 standard is a technical standard for sponge rubber sheets used in aviation. Using sponge rubber sheets that meet this standard helps ensure that the physical and mechanical properties of the entire shock absorption assembly meet the requirements of the launch vehicle.

[0018] Preferably, both the first baffle and the second baffle are 2A12-T4 state aluminum alloy plates.

[0019] The 2A12-T4 aluminum alloy plate has high tensile strength and can withstand large tensile forces, which helps to improve the stability and safety of the entire shock absorption assembly.

[0020] Preferably, slots are formed in the main body and the second baffle for the passage of the detonating cord of the explosive bolt, the slots forming part of the receiving space.

[0021] When assembling the shock absorber assembly onto the explosion bolt, the slot and the detonating cord can be aligned first to facilitate the positioning of the shock absorber assembly and also to prevent the detonating cord from being accidentally squeezed during the assembly process.

[0022] Preferably, the first sponge rubber sheet and the first baffle are provided with slots for engaging with explosive bolts, the slots forming part of the receiving space, and the diameter of the slots being larger than the diameter of the opening.

[0023] Because the shape of the explosive bolt makes it prone to slipping out in conventional primary buffer assemblies, this design adds a secondary buffer. By adding a primary retaining groove, and using two grooves of different sizes, it ensures that the explosive bolt will not slip out during an explosive impact, thus preventing buffer assembly failure. During assembly installation, the retaining groove can be used to hold the explosive bolt (or the nut on the explosive bolt), facilitating the assembly of the buffer and shock absorption assembly with the explosive bolt. The shape of the retaining groove can be designed according to the shape of the explosive bolt (or nut). For example, the retaining groove can be designed as a hexagon corresponding to the nut on the explosive bolt. By making the diameter of the retaining groove larger than the diameter of the slot, the interface between the retaining groove and the slot can be formed as a stepped surface, thereby limiting the axial displacement of the explosive bolt.

[0024] Preferably, the second sponge rubber sheet is disposed on the inner wall surface of the groove.

[0025] When slots are machined into the main body, sharp burrs and corners may be left on the inner wall of the slot. The second sponge rubber sheet can prevent the inner wall of the slot from directly contacting the detonating cord, preventing the detonating cord from being accidentally cut or abraded.

[0026] Preferably, a third sponge rubber plate is provided on the inner wall surface of the card slot, and the third sponge rubber plate is a sponge rubber plate conforming to the HG6-413 standard.

[0027] The size of the slot is generally slightly larger than the size of its corresponding expansion bolt (or nut) to facilitate assembly, but after assembly, a gap will be left between the slot and the expansion bolt (or nut). By setting a third sponge rubber plate, this gap can be filled, so that the expansion bolt (or nut) is tightly fitted by the third sponge rubber plate after assembly, enhancing the limiting effect. Attached Figure Description

[0028] Figure 1 This is a frontal perspective view of the explosion bolt buffer shock absorption assembly of this utility model.

[0029] Figure 2 This is a perspective view of the explosion bolt buffer shock absorption assembly of this utility model from the rear.

[0030] Figure 3 This is a cross-sectional view of an existing explosive bolt buffer and shock absorption assembly.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Honeycomb panel; 2. First baffle; 3. Pad; 4. First sponge rubber sheet; 5. Second baffle; 6. Second sponge rubber sheet; 7. Third sponge rubber sheet; C1. Slot; C2. Groove.

[0033] 10. Upper connector; 20. Lower connector; 30. Explosion bolt; 40. Loading nut; 50. Anti-loosening nut; 60. Upper vibration damping honeycomb structure; 70. Cover; 80. Lower vibration damping honeycomb structure; 90. Pad. Detailed Implementation

[0034] The exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following embodiments, for ease of explanation, an example of the explosion bolt buffer shock absorption assembly (hereinafter referred to as the assembly) of the present invention is shown, but the present invention is not limited thereto.

[0035] Figure 3 An explosion bolt damping assembly is shown as a prior art example in CN 106143954A. Figure 3 In the prior art shown, the upper connector 10 and the lower connector 20 are respectively disposed in different parts of the arrow body. When one of the arrow body parts detaches, the interface between the upper connector 10 and the lower connector 20 becomes a separation surface.

[0036] An explosion bolt 30 passes through holes in the upper connector 10 and the lower connector 20, and is secured together by a loading nut 40 screwed onto the explosion bolt 30. An anti-loosening nut 50 is provided on the loading nut 40. A lower vibration-damping honeycomb structure 80 is provided at the lower end of the explosion bolt 30 located on the side of the lower connector 20. The lower vibration-damping honeycomb structure 80 is fixed to the lower end of the explosion bolt 30 by a pad 90.

[0037] The upper end of the explosion bolt 30, located on the side of the upper connector 10, extends from above the lock nut 50, thus making the upper end of the explosion bolt 30 easily free after it explodes. An upper damping honeycomb structure 60 and a sleeve 70 for securing the upper damping honeycomb structure 60 are provided around the upper end of the explosion bolt 30. The sleeve 70 is secured to the upper connector 10 by multiple additional screws.

[0038] from Figure 3 As can be seen, sufficient space must be left around the sleeve 70 to correspond to the screw. In cases of limited space or complex shapes, the presence of the sleeve 70 will inevitably result in insufficient space for the upper damping honeycomb structure 60, thus compromising the reliability of the damping and shock absorption. Furthermore, the free end of the explosion bolt is surrounded only by a primary damping component (i.e., the upper damping honeycomb structure 60 and the sleeve 70). Due to the shape of the explosion bolt, it is easy for the bolt to slip out of this damping component.

[0039] Figure 1 and Figure 2 This is a perspective view of the explosion bolt buffer and shock absorption assembly of this utility model. This assembly can replace... Figure 3The upper vibration-damping honeycomb structure 60 and the cover 70 are assembled onto the explosion bolts 30. Figure 1 This is the view from the front, showing the overall appearance of the component. Figure 2 This is the view from the rear, showing the internal space of the component and its mounting surface. Please note that "front" and "rear" are used here for ease of explanation only and are not intended to define the actual location and orientation of the component.

[0040] The components of this embodiment include: a main body made of a honeycomb panel 1; and a pad 3 fixed to a first side of the honeycomb panel 1 by an adhesive. Figure 1 (Left side); the second baffle 5, which is fixed to the second side of the honeycomb panel 1 by adhesive. Figure 1 (Right side of the middle); the first sponge rubber plate 4, which is located on the opposite side of the second baffle 5 to the honeycomb plate 1 (i.e., located on the second baffle 5 in the middle). Figure 1 (on the right side of the first sponge rubber plate 4), and the first sponge rubber plate 4 is fixed to the second baffle 5 by adhesive; and the first baffle 2, which is located on the side of the first sponge rubber plate 4 opposite to the second baffle 5 (i.e., located on the side of the first sponge rubber plate 4 in the middle). Figure 1 (on the right side of the middle), and the first baffle 2 is fixed to the first sponge rubber plate 4 by adhesive.

[0041] The honeycomb panel 1 can be made of aluminum. Upon impact from the free end of the explosive bolt, the honeycomb panel 1 will crush and absorb a large amount of impact energy. The first baffle 2 and the second baffle 5 can both be, for example, 4mm thick 2A12-T4 aluminum alloy plates. The pad 3 can be, for example, 1mm thick 2A12-T4 aluminum alloy plates.

[0042] like Figure 2 As shown, an internal receiving space for mounting the explosive bolt is formed within the component. This receiving space includes a slot C1 and a groove C2. The slot C1 is formed on the first sponge rubber plate 4 and the first baffle 2 for engaging the explosive bolt (or a nut mounted on the explosive bolt), and therefore can have a hexagonal shape corresponding to the explosive bolt (or nut). The groove C2 is formed on the honeycomb plate 1 and the second baffle 5 for accommodating the detonating cord. The diameter of the slot C1 is larger than the diameter of the groove C2, therefore the interface between the slot C1 and the groove C2 is formed as a stepped surface, preventing the explosive bolt from axially shifting into the groove C2. In the event of an explosive impact, the two grooves of different sizes (i.e., the slot C1 and the groove C2) ensure that the explosive bolt will not slip out of the slot, causing the buffer component to fail.

[0043] A third sponge rubber plate 7 is provided on the inner wall of the slot C1, and a second sponge rubber plate 6 is provided on the inner wall of the slot C2. The second sponge rubber plate 6 and the third sponge rubber plate 7 can be fixed together using an adhesive.

[0044] When the component is assembled to the explosive bolt, the detonating cord of the explosive bolt passes through the area covered by the second sponge rubber plate 6, and the third sponge rubber plate 7 can directly contact the explosive bolt (or nut). In the slot C2, the combination of the second sponge rubber plate 6 and the aluminum honeycomb plate 1 forms a two-stage buffer structure, which can improve the uneven stress distribution on the honeycomb plate 1. In addition, the second sponge rubber plate 6 also helps to reduce the size of the next stage of buffer material (i.e., the honeycomb plate 1), thereby reducing the overall size of the component.

[0045] In this embodiment, HY914 structural adhesive is used as the bonding agent to bond the various components together. Similarly, HY914 structural adhesive can also be used to bond the entire assembly to the mounting position around the expansion bolts. The shock absorption structure of this application is easy and quick to install, and requires no other additional fixing measures.

[0046] The first sponge rubber sheet 4, the second sponge rubber sheet 6, and the third sponge rubber sheet 7 can all be sponge rubber sheets conforming to the HG6-413 standard. Compared to the honeycomb panel 1, the first baffle 2, and the second baffle 5 made of aluminum, the sponge rubber sheets are easier to cut and process, thus better adapting to the irregular shape of the explosion bolts, simplifying the actual assembly process, and further improving the reliability of the explosion bolts after installation.

[0047] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. Those skilled in the art will readily understand that various modifications and equivalent substitutions can be made based on the claims without departing from the spirit and essence of the present invention. Therefore, the scope of the claims should be interpreted in the broadest possible sense to include all modifications, equivalent structures, and functions.

Claims

1. An explosive bolt damping and shock absorption assembly, wherein an internal receiving space is formed for installing explosive bolts, the explosive bolt damping and shock absorption assembly comprising: Main body; and A pad, which is fixed to the first side of the main body by adhesive. The explosive bolt buffer and shock absorption assembly is characterized in that it further includes: The second baffle is fixed to the second side of the main body by the adhesive. A first sponge rubber sheet is located on the side of the second baffle opposite to the main body, and the first sponge rubber sheet is fixed to the second baffle by the adhesive; and A first baffle is located on the side of the first sponge rubber sheet opposite to the second baffle, and the first baffle is fixed to the first sponge rubber sheet by the adhesive. The main body is made of honeycomb panels, and a second sponge rubber plate is provided on the inner wall of the accommodating space.

2. The explosion bolt buffer and shock absorption assembly according to claim 1, characterized in that, When the explosive bolt buffer and shock absorption assembly is assembled to the explosive bolt, the detonating cord of the explosive bolt passes through the area covered by the second sponge rubber plate.

3. The explosion bolt buffer and shock absorption assembly according to claim 1 or 2, characterized in that, The adhesive is HY914 structural adhesive.

4. The explosion bolt buffer and shock absorption assembly according to claim 1 or 2, characterized in that, The honeycomb panel is made of aluminum.

5. The explosion bolt buffer and shock absorption assembly according to claim 1 or 2, characterized in that, Both the first and second sponge rubber sheets are sponge rubber sheets that conform to the HG6-413 standard.

6. The explosion bolt buffer and shock absorption assembly according to claim 1 or 2, characterized in that, Both the first baffle and the second baffle are made of 2A12-T4 aluminum alloy plates.

7. The explosion bolt buffer and shock absorption assembly according to claim 1 or 2, characterized in that, The main body and the second baffle have slots for the detonating cord of the explosive bolt to pass through, and the slots form part of the receiving space.

8. The explosion bolt buffer and shock absorption assembly according to claim 7, characterized in that, The first sponge rubber sheet and the first baffle are provided with slots for engaging with explosive bolts. The slots form part of the receiving space, and the diameter of the slots is larger than the diameter of the openings.

9. The explosion bolt buffer and shock absorption assembly according to claim 8, characterized in that, The second sponge rubber sheet is disposed on the inner wall surface of the groove.

10. The explosion bolt buffer and shock absorption assembly according to claim 9, characterized in that, A third sponge rubber plate is provided on the inner wall surface of the card slot, and the third sponge rubber plate is a sponge rubber plate conforming to the HG6-413 standard.

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