Recyclable launching box fragile cover, launching box and method

Abstract

The invention belongs to the field of launch boxes, and discloses a reusable launch box fragile cover, a launch box and a method, the reusable launch box fragile cover comprises a cover frame, a fragile cover body and a pressing plate, the fragile cover body is composed of a plurality of springback petal bodies, and the springback petal bodies comprise elastic bodies, skin and light filler, so that the fragile cover can be opened and folded outwards under the action of external force, and the pressing plate is arranged on the fragile cover body. Meanwhile, the springback petal bodies can be recovered, so that the fragile cover can be repeatedly used, and the maintenance cost is greatly reduced; in addition, due to the adoption of the design of the springback petal bodies, the damage to operators, peripheral equipment and the environment caused by splinters generated by opening the cover in a traditional explosion mode is avoided, and the safety is improved. By the adoption of the fragile cover, the problems that an existing fragile cover of the launching box is disposable, maintenance cost is high, and potential safety hazards exist are effectively solved; the fragile cover has the advantages of light weight, water resistance, dust resistance, corrosion resistance and the like; and the strength is high, the response is fast, rebounding can be achieved, and an internal missile can be effectively isolated from the outside when not in use.

Description

Technical Field

[0001] The present invention belongs to the technical field of launch boxes, and in particular relates to a reusable launch box fragile cover, a launch box and a method. Background Art

[0002] The missile launch box frangible cover is a key component in the missile launch system, used as a sealing cover when the missile is launched. Its main function is to break quickly when the missile is launched, provide sufficient exit space for the missile, and ensure that the missile warhead is not damaged. This design simplifies the launch process, improves the launch response speed during wartime, and avoids the design that may damage the missile seeker, such as opening the mechanical structure or igniting the explosive mechanism in advance.

[0003] At present, traditional fragile covers usually adopt an explosive opening cover. Although the explosive opening type fragile cover has the advantages of quick opening in the missile launch system; however, the explosive opening cover is a disposable product, and the fragments cannot be restored. It needs to be replaced after each use, resulting in high maintenance costs; and the fragments generated during the blasting process need to splash in a predetermined direction. If they are not accurately adjusted and positioned before launch, the fragments after the fragile cover is destroyed are likely to cause damage to the operator and its surrounding equipment and environment.

[0004] It can be seen that the fragile cover of the existing launch box has certain safety hazards and high maintenance costs because it is designed as a one-time ejection structure. Summary of the invention

[0005] The present invention provides a reusable launch box fragile cover, a launch box and a method, so as to solve the technical problems that the existing launch box fragile cover has certain safety hazards and high maintenance costs due to its design as a one-time ejection structure.

[0006] In order to achieve the above object, the present invention adopts the following technical contents: In a first aspect, the present invention provides a reusable launch box fragile cover, comprising a cover frame, a fragile cover body and a pressure plate; The cover frame adopts an annular structure, and the fragile cover body is a spherical structure as a whole; the outer edge of the fragile cover body is connected to the circumference of the cover frame through a pressing plate; The frangible cover body comprises a top cover and a plurality of resilient petals having the same structure; The resilient valve body comprises an elastic body, a skin and a lightweight filler; The skin serves as the outermost layer of the resilient petal body, and the internal cavity is filled with the lightweight filler; The elastic body is arranged between the top skin and the light filler, and is located at the bend of the resilient petal body; The top cover is connected to one of the resilient petals, the top cover is provided with a step surface, and the other resilient petals are overlapped on the step surface of the top cover; the outer surfaces of all the resilient petals and the outer surfaces of the resilient petals form a complete spherical structure.

[0007] Furthermore, the elastomer is made of polyurethane, styrene-butadiene block copolymer or polyolefin material.

[0008] Furthermore, the lightweight filler is made of foam plastic material.

[0009] Furthermore, the foam plastic material is polymethacrylimide, foamed polypropylene or polyurethane.

[0010] Furthermore, an N-shaped principal stress groove is provided at the bottom of the bend of the resilient petal body for bursting under the action of impact or engine gas flow.

[0011] Furthermore, a sealing ring is provided on the circumferential inner wall of the cover frame.

[0012] Furthermore, the top cover and the connected resilient petal body are connected by riveting or integral molding.

[0013] Furthermore, sealant is applied between the joints between the cover frame, the fragile cover body and the pressure plate; sealant is applied between each two adjacent resilient petals; and sealant is applied at the joints between the resilient petals and the top cover.

[0014] In a second aspect, the present invention provides a method for using a reusable launch box frangible cover, based on the above-mentioned reusable launch box frangible cover, comprising: When the fragile cover of the reusable launch box is subjected to the impact force from inside the launch box, the top cover pops up outwards under the force, driving a resilient petal body connected to the top cover to flip outwards, and at the same time driving the other resilient petals overlapped on the top cover step to flip outwards; After all the resilient petals are turned outward, a missile channel is formed for the missile to pass through; All resilient flaps are reset under the action of the internal elastomer to maintain the integrity of the fragile cover of the reusable launch box.

[0015] In a third aspect, the present invention provides a missile launch box, comprising a box body and the above-mentioned reusable launch box fragile cover connected thereto.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a reusable launch box fragile cover, which is composed of a cover frame, a fragile cover body and a pressure plate. The fragile cover body is composed of a plurality of resilient petals, which include an elastic body, a skin and a lightweight filler, so that the fragile cover can be opened and folded outward when subjected to an external force, and the resilient petals can be restored, thereby realizing the reuse of the fragile cover and greatly reducing the maintenance cost; in addition, due to the design of the resilient petals, the damage to the operator, surrounding equipment and environment caused by the fragments produced by the traditional explosive opening of the cover is avoided, thereby improving safety. The use of the fragile cover effectively solves the problems of the existing launch box fragile cover being disposable, having high maintenance costs and potential safety hazards; the fragile cover is not only lightweight, waterproof, dustproof and anti-corrosive, but also has high strength, fast response and resilience, and can effectively isolate the internal missile from the outside world when not in use, and has good promotion and application value.

[0017] Preferably, in the present invention, the material of the elastomer can be polyurethane, styrene-butadiene block copolymer or polyolefin, which have good elasticity and recovery properties, and can ensure that the resilient valve body can quickly return to its original shape after being subjected to external force, thereby extending the service life of the fragile cover.

[0018] Preferably, in the present invention, the lightweight filler is made of foam plastic, which is light and has a certain strength, and can reduce the weight of the fragile cover while ensuring the overall structural stability of the fragile cover, thereby facilitating operation and use.

[0019] Further preferably, in the present invention, the foam plastic is made of polymethacrylimide, foamed polypropylene or polyurethane, which have good foaming properties and strength, can meet the use requirements of the fragile cover in specific environments, and improve the reliability and durability of the fragile cover.

[0020] Preferably, in the present invention, an N-shaped principal stress groove is provided at the bend of the resilient petal body. This design can make the fragile cover burst more easily under the action of a breakout or engine gas flow, thereby ensuring good mechanical properties and ensuring the formation of the missile channel and the missile launch process.

[0021] Preferably, in the present invention, a sealing ring is provided on the circumferential inner wall of the cover frame. This design can enhance the sealing performance between the fragile cover and the launch box, prevent external gas or liquid from entering the interior of the launch box, and ensure the normal operation of the launch system.

[0022] Preferably, in the present invention, the connection between the top cover and the connected resilient petal body is riveted or integrally formed, which can ensure the overall structural stability and reliability of the fragile cover. If riveting is used, it is also convenient for the assembly and disassembly of the fragile cover; and the integrally formed structure further ensures structural stability.

[0023] Preferably, in the present invention, sealant is applied to the connection between the cover frame, the fragile cover body and the pressure plate, and the connection between the resilient flap body and the top cover. This design can further enhance the sealing performance of the fragile cover, prevent gas or liquid leakage, and improve the reliability and safety of the fragile cover.

[0024] The present invention also provides a method for using a fragile cover of a reusable launch box. Based on the above-mentioned fragile cover of the reusable launch box, the method realizes the rapid opening and resetting of the fragile cover through the coordinated action of the top cover and multiple resilient petals; when the missile is launched, the fragile cover can quickly respond to the impact force inside the launch box to form a missile channel to ensure the smooth launch of the missile; at the same time, due to the design of the resilient petal body, the fragile cover can automatically reset after opening to maintain its integrity, thereby realizing the reuse of the fragile cover and greatly reducing the maintenance cost; the use of this method also avoids the damage to the operator, surrounding equipment and environment caused by the fragments generated during the blasting process of the traditional blasting cover opening, thereby improving the safety and reliability of the launch process.

[0025] The present invention also provides a missile launch box, comprising a reusable launch box frangible cover and a box body; due to the use of the reusable launch box frangible cover, the function of being able to quickly open and form a missile channel when the missile is launched is achieved, while ensuring the automatic reset ability of the frangible cover after opening, thereby achieving the reuse of the frangible cover and greatly reducing the maintenance cost of the missile launch system; the use of the missile launch box can enable the frangible cover to quickly respond and open when subjected to impact force, while ensuring the safety and reliability of the frangible cover during the opening process, avoiding the potential safety hazards caused by the traditional explosive cover opening method. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An exploded view of the structure of a fragile cover of a reusable launch box provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of the outer surface side of a fragile cover of a reusable launch box provided in an embodiment of the present invention; Figure 3 A schematic structural diagram of the inner surface side of a fragile cover of a reusable launch box provided in an embodiment of the present invention; Figure 4 A side cross-sectional view of a resilient petal body of a frangible cover of a reusable launch box provided in an embodiment of the present invention; Figure 5 A diagram showing the connection between a resilient flap and a top cover of a fragile cover of a reusable launch box provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of a resilient flap of a frangible cover of a reusable launch box provided in an embodiment of the present invention; Figure 7A schematic structural diagram of a cover frame of a fragile cover of a reusable launch box provided in an embodiment of the present invention; Figure 8 A schematic structural diagram of a sealing ring of a fragile cover of a reusable launch box provided in an embodiment of the present invention.

[0027] Reference numerals: 1. Sealing ring; 2. Cover frame; 3. Fragile cover; 4. Press plate; 5. Pin; 3-1. Resilient valve body; 3-2. Elastomer; 3-3. Skin; 3-4. Lightweight filler; 3-5. Top cover. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does 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 therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example 1 As described in the background technology, currently, the fragile cover is a very important component in the missile launch system. During normal storage, the box cover ensures the sealing of the entire launch box and also plays a role in protecting the missile. When the missile is launched, the box cover needs to be able to be opened in time to allow the missile to be launched smoothly. The traditional mechanical opening cover and the blasting opening cover have the defects of heavy weight, slow reaction time and high maintenance cost. It can be seen that the existing launch box fragile cover, due to its design of a one-time throwing structure, has certain safety hazards and high maintenance costs.

[0036] In order to solve the above problems, the present invention provides a reusable launch box fragile cover, a launch box and a method. The reusable launch box fragile cover can be smoothly opened under a small impact and has rebound performance, can be used multiple times and avoids safety hazards. The reusable launch box fragile cover does not need to be repeatedly replaced after the missile launch is completed, and can be reused, which greatly reduces the maintenance cost of the missile launch system.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a reusable launch box fragile cover, such as Figure 7 As shown, the cover frame 2 is in an annular structure, serving as a supporting frame for the entire structure.

[0038] The fragile cover body 3 is spherical in shape as a whole, and its edge portion is firmly connected along the periphery of the cover frame 2 through the pressing plate 4. In this embodiment, the cover frame 2, the fragile cover body 3 and the pressing plate 4 are fixed by pins 5.

[0039] Combination Figure 4 and Figure 6As shown, the fragile cover body 3 includes a top cover 3-5 and a plurality of resilient flap bodies 3-1 of the same structure; these resilient flap bodies 3-1 are composed of an elastomer 3-2, a skin 3-3 and a lightweight filler 3-4.

[0040] The skin 3-3 is the outermost layer of the resilient flap body 3-1, and its internal cavity is filled with a lightweight filler 3-4. The lightweight filler 3-4 can make the overall fragile cover have a lightweight characteristic.

[0041] The elastic body 3-2 is arranged between the skin 3-3 and the lightweight filler 3-4, and is located at the bending part of the resilient petal body 3-1 to ensure that the petal body can quickly return to its original shape after being subjected to force.

[0042] like Figure 5 and Figure 6 As shown, the top cover 3-5 is directly connected to one of the resilient petals 3-1, and its surface is designed with a step surface so that the remaining 8 resilient petals 3-1 can overlap and fit on this step surface; when all the resilient petals 3-1 are arranged in this way, their outer surfaces together form a complete spherical structure, which echoes the overall shape of the fragile cover 3-5.

[0043] The fragile cover is composed of a cover frame, a fragile cover body and a pressure plate. The fragile cover body is composed of a plurality of resilient petals, which include an elastic body, a skin and a lightweight filler, so that the fragile cover can be opened and folded outward when subjected to external force. At the same time, the resilient petals can be restored, which enables the fragile cover to be reused and greatly reduces maintenance costs. In addition, due to the design of the resilient petals, the damage to operators, surrounding equipment and the environment caused by the fragments produced by the traditional explosive opening of the cover is avoided, thereby improving safety. The use of the fragile cover effectively solves the problems of the existing launch box fragile cover being disposable, having high maintenance costs and potential safety hazards. The fragile cover is not only lightweight, waterproof, dustproof and anti-corrosive, but also has high strength, fast response and resilience. It can effectively isolate the internal missile from the outside world when not in use, and has good promotion and application value.

[0044] This embodiment also provides a working principle of a reusable launch box fragile cover, which specifically includes: When the fragile cover of the reusable launch box is subjected to the impact force from inside the launch box, the top cover 3-5 bounces outwards under the force, driving a resilient petal body 3-1 connected to the top cover 3-5 to flip outwards, and at the same time driving the remaining resilient petal bodies 3-1 overlapped on the steps of the top cover 3-5 to flip outwards; After all the resilient petals 3-1 are turned outward, a missile passage is formed for the missile to pass through; All the resilient flaps 3-1 are reset under the action of the internal elastic body 3-2 to maintain the integrity of the fragile cover of the reusable launch box.

[0045] Example 2 This embodiment provides another reusable launch box fragile cover, which is further improved and optimized on the basis of embodiment 1, as follows: Combination Figure 1 and Figure 8 As shown, in order to enhance the sealing performance between the fragile cover and the launch box and prevent external gas or liquid from entering the launch box, a sealing ring 1 is provided on the circumferential inner wall of the cover frame 2, thereby improving the overall sealing performance and ensuring the normal operation of the launch system.

[0046] In this embodiment, in order to further enhance the sealing performance of the fragile cover, sealant is applied to the connection between the cover frame 2, the fragile cover body 3 and the pressure plate 4, and the connection between the resilient flap body 3-1 and the top cover 3-5; the design of the sealant serves as a weak link between the components, and can further enhance the sealing performance of the fragile cover, prevent gas or liquid leakage, and improve the reliability and safety of the fragile cover.

[0047] In this embodiment, the connection between the top cover 3-4 and the connected resilient petal body 3-1 is riveted or integrally formed, which can ensure the overall structural stability and reliability of the fragile cover. If riveting is used, it is also convenient for the assembly and disassembly of the fragile cover; and the integrally formed structure further ensures structural stability.

[0048] like Figure 4 and Figure 6 As shown, in this embodiment, an N-shaped principal stress groove is provided at the bend of the resilient petal body 3-1. This design can make the fragile cover burst more easily under the action of a breakout or engine gas flow, thereby ensuring good mechanical properties and ensuring the formation of the missile channel and the missile launch process.

[0049] In this embodiment, the elastic body 3 - 2 of the resilient flap body 3 - 1 is made of one of polyurethane, styrene-butadiene block copolymer or polyolefin, namely PU, SBS, POE, etc.; In this embodiment, the lightweight filler 3 - 4 is made of foam plastic material, such as polymethacrylimide, foamed polypropylene or polyurethane, namely PMI / EPP / PU and the like.

[0050] In this embodiment, the skin 3-3 is made of carbon fiber-epoxy resin / glass fiber-epoxy resin prepreg skin.

[0051] In this embodiment, the number of the resilient petals 3-1 is preferably 9, one of which is riveted to the top cover 3-5; the other 8 resilient petals 3-1 are overlapped on the bottom surface of the step of the top cover 3-5.

[0052] In this embodiment, the principle of using nine resilient petals 3-1 is as follows: For the fragile cover as a whole, according to the dynamic equation, it is assumed that the multi-rigid body system consists of N rigid bodies, which is subject to s independent constraints, and the number of degrees of freedom is δ If the system is affected δ If there are two independent driving constraints, the motion of the system will be uniquely determined by the hinge constraint and the driving constraint. This type of system is called a motion-driven system, and the corresponding problem is a kinematic analysis problem. If the system has a definite configuration and specific initial conditions under the action of external forces, its dynamic response is definite. In this case, the analysis of the position, velocity and acceleration of the system during motion is called dynamic analysis. In this case, if the external force is independent of time, the static equilibrium position of the system can be solved, that is, the static equilibrium analysis problem.

[0053] For a system composed of N rigid bodies, each rigid body is described by Cartesian coordinates based on Euler quaternions, and the total number of coordinates describing the configuration of the entire multi-body system is 9N. Obviously, these coordinates are not independent. In addition to the constraint equations of the quaternions, there are constraint equations for each pair of adjacent rigid bodies. The set of these equations generally constitutes a redundant set of constraint equations. For this reason, Lagrange multipliers are introduced, and the dynamic equations of the entire system are derived from the Lagrange equations with multipliers.

[0054] In the formula, Z is the generalized mass matrix; z For the force array; z I is the inertial force matrix; δ is the Lagrange multiplier matrix corresponding to the constraint equation; represents the constraint condition; q is the generalized coordinate.

[0055] The final calculation shows that when N=9, it just meets the design requirements, and the cover opening angle is 90-120°, which can not only allow the missile to pass smoothly, but also achieve complete rebound of the resilient petal body 3-1.

[0056] It can be seen that this embodiment provides a reusable launch box fragile cover, which has the following advantages: First, the fragile cover of the reusable launch box is made of hard foam such as PMI / EPP / PU as the main material, and the upper and lower layers are covered with carbon fiber-epoxy resin or glass fiber-epoxy resin prepreg skins, which greatly reduces the weight.

[0057] Second, a mooring net is set between the main body of the fragile cover to make the fragile cover product form a whole. At the same time, the weak part of the fragile cover is adjusted according to the actual force, and the influence of the crack strength on the maximum impact force is analyzed. According to the maximum impact force, the crack strength of the fragile cover can be quickly determined to determine the direction and structure of the prefabricated crack.

[0058] Thirdly, the fragile cover is provided with elastomers such as PU, SBS, POE, etc. at the weak parts subject to greater stress, and the fragile cover body is provided with pre-set cracks radiating all around. Combined with the scientific setting of thin walls, the entire fragile cover product can be cracked along the stress groove and turned outward to form an object channel, and the cover body fragments will not fall off the frame. After being taken out of the tube, the cover body fragments can rebound and can be reused.

[0059] The present embodiment also provides a missile launch box, comprising any one of the reusable launch box frangible cover and box body of embodiment 1 or embodiment 2. Due to the use of the reusable launch box frangible cover, the function of being able to quickly open and form a missile channel when the missile is launched is achieved, while ensuring the automatic reset ability of the frangible cover after opening, thereby achieving the reuse of the frangible cover and greatly reducing the maintenance cost of the missile launch system; the use of the missile launch box can enable the frangible cover to quickly respond and open when subjected to impact force, while ensuring the safety and reliability of the frangible cover during the opening process, avoiding the safety hazards that may be caused by the traditional explosive opening of the cover.

[0060] In this embodiment, the interfaces between the cover frame 2 and the box body, the pressure plate 3 and the fragile cover body 3 are coordinated, and the surface is anodized to have good mechanical properties and corrosion resistance.

[0061] In summary, the present invention provides a reusable launch box frangible cover, a launch box and a method. The reusable launch box frangible cover, through the design of a cover frame with an annular structure and a frangible cover body with a spherical structure, cooperates with the frangible cover body composed of a plurality of resilient petals, thereby realizing reliable bursting under the action of impact or engine gas flow, while ensuring the integrity and recyclability of the frangible cover; in addition, the use of elastomers made of materials such as polyurethane, styrene-butadiene block copolymer or polyolefin, and lightweight fillers made of foam plastics further enhances the resilience and lightweight characteristics of the frangible cover; and the design of the N-shaped principal stress groove optimizes the bursting effect, and the use of sealing rings and sealants improves the overall sealing performance, so that the frangible cover is not only suitable for various launch boxes, but also has good durability and safety.

[0062] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A reusable launch box fragile cover, characterized in that: It comprises a cover frame (2), a fragile cover body (3) and a pressing plate (4); The cover frame (2) adopts an annular structure, and the fragile cover body (3) is a spherical structure as a whole; the outer edge of the fragile cover body (3) is connected to the circumference of the cover frame (2) via a pressing plate (4); The fragile cover body (3) comprises a top cover (3-5) and a plurality of resilient petals (3-1) having the same structure; The resilient flap body (3-1) comprises an elastic body (3-2), a skin (3-3) and a lightweight filler (3-4); The skin (3-3) serves as the outermost layer of the resilient flap body (3-1), and the internal cavity is filled with the lightweight filler (3-4); The elastic body (3-2) is arranged between the top skin (3-3) and the lightweight filler (3-4), and is located at the bend of the resilient petal body (3-1); The top cover (3-5) is connected to one of the resilient petal bodies (3-1); the top cover (3-5) is provided with a step surface, and the remaining resilient petal bodies (3-1) are overlapped on the step surface of the top cover (3-5); the outer surfaces of all the resilient petal bodies (3-1) and the outer surfaces of the resilient petal bodies (3-1) form a complete spherical structure.

2. The reusable launch box frangible cover according to claim 1, characterized in that: The elastomer (3-2) is made of polyurethane, styrene-butadiene block copolymer or polyolefin material.

3. The reusable launch box frangible cover according to claim 1, characterized in that: The lightweight filler (3-4) is made of foam plastic material.

4. The reusable launch box frangible cover according to claim 3, characterized in that: The foam plastic material is polymethacrylimide, foamed polypropylene or polyurethane.

5. The reusable launch box frangible cover according to claim 1, characterized in that: An N-shaped main stress groove is provided at the bottom of the bend of the resilient petal body (3-1) for bursting under the action of impact or engine gas flow.

6. A reusable launch box frangible cover according to claim 1, characterized in that: A sealing ring (1) is provided on the circumferential inner wall of the cover frame (2).

7. A reusable launch box frangible cover according to claim 1, characterized in that: The top cover (3-5) and the connected resilient petal body (3-1) are connected by riveting or integral molding.

8. The reusable launch box frangible cover according to claim 1, characterized in that: Sealant is applied between the joints between the cover frame (2), the fragile cover body (3) and the pressure plate (4); sealant is applied between each two adjacent resilient petals (3-1); and sealant is applied between the joints between the resilient petals (3-1) and the top cover (3-5).

9. A method for using a reusable launch box fragile cover, characterized in that: The reusable launch box frangible cover according to any one of claims 1 to 8 comprises: When the fragile cover of the reusable launch box is subjected to an impact force from inside the launch box, the top cover (3-5) bounces outwards under the force, driving a resilient petal body (3-1) connected to the top cover (3-5) to flip outwards, and at the same time driving the remaining resilient petal bodies (3-1) overlapped on the steps of the top cover (3-5) to flip outwards; After all the resilient petals (3-1) are turned outward, a missile passage is formed for the missile to pass through; All the resilient flaps (3-1) are reset under the action of the internal elastic body (3-2) to maintain the integrity of the fragile cover of the reusable launch box.

10. A missile launch box, characterized in that: It comprises a box body and a frangible cover of a reusable launch box as described in any one of claims 1 to 8 connected thereto.

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