Launching box end cover with fragment directional movement function

Abstract

The invention relates to a launching box end cover with a fragment directional movement function. A guide mechanism is arranged between an end cover body and an end cover flange of the launching box end cover; the end cover body is provided with a cover body main body and a cover body skirt surrounding the outer edge of the cover body main body, the end cover flange is sequentially provided with an inner ring sealing face and an outer ring flange face in the radial direction, and the cover body skirt is installed in the inner ring sealing face in a matched mode. One end of the guide mechanism is connected with the outer surface of the cover main body, and the other end of the guide mechanism is connected with the outer surface of the outer ring flange surface; the launching box end cover is assembled at an opening in the front end of the launching box body through an end cover flange. Compared with the prior art, the launching box end cover with the fragment directional movement function is easy to operate and low in cost, the risk that fragments collide with equipment can be avoided, and compared with other material end covers with the same function, the launching box end cover has the advantage of being lower in cost.

Description

Technical Field

[0001] This invention relates to the field of missile launch safety technology, and in particular to a launch box end cap with a fragment directional movement function. Background Technology

[0002] Rapid launch technology has become a core development trend in missile weapon systems, affecting not only operational response efficiency but also the actual combat effectiveness of weapon systems. Currently, the vast majority of missile models in my country have adopted launch canister (tube) launch technology. Compared to the traditional bare missile launch mode, this technology provides a better storage and protection environment for missiles, while significantly improving the missile's anti-jamming capability and accuracy, and has become a key component of modern missile weapon systems.

[0003] In the launch canister (tube) system, the end cap plays an indispensable dual key role: on the one hand, during the storage phase, the end cap must have reliable sealing performance to effectively isolate interference factors such as humidity and dust in the external environment, ensure the storage reliability of the missile, and extend the service life of the missile; on the other hand, during the launch phase, the end cap must quickly and smoothly clear the launch channel to ensure that the missile launch process is not obstructed and does not affect the launch accuracy and reliability.

[0004] With the rapid development of shipborne, vehicle-mounted, and other mobile missile systems, the spatial constraints and equipment density of launch scenarios have significantly increased. The need to prevent uncontrolled fragmentation of the end cap during launch from colliding with carrier equipment and personnel is becoming increasingly urgent. To address this need, the industry has developed end cap technology that prevents detachment; however, its complex structural design and specialized processes result in high manufacturing costs, hindering large-scale application.

[0005] In contrast, existing fragile cover technology is mature in structure and cost-effective, and has been widely used in various missile launch boxes. For example, patent CN112985173A discloses a lightweight sealed front cover that uses a support mechanism to improve reverse load-bearing capacity. This front cover has a weak area. When a shock wave impacts the front cover, it breaks along the weak area and flies out. However, the core drawback is that after the end cover breaks, the fragments are scattered randomly, which can easily cause collision damage to surrounding equipment and personnel. Therefore, if the trajectory of the fragments can be controlled through simple and feasible technical modifications based on existing fragile cover technology, thereby avoiding collision risks, it will undoubtedly provide a highly feasible and economical technical path for this field, which is of great significance for promoting the improvement of the safety performance of mobile missile systems. Summary of the Invention

[0006] The purpose of this invention is to provide a launch box end cap with a fragment directional movement function, which can realize the directional movement of the launch box end cap fragments, effectively avoid the risk of fragments colliding with the equipment, and has a simple structure and low cost.

[0007] The objective of this invention can be achieved through the following technical solutions: The present invention aims to provide a launch box end cover with fragment directional movement function, characterized in that it includes an end cover flange, an end cover body, and a guide mechanism, wherein the end cover flange is arranged around the outer edge of the end cover body, and the two ends of the guide mechanism are respectively connected to the end cover flange and the end cover body. The end cap body includes a main body and a skirt surrounding the outer edge of the main body. The end cap flange includes an inner sealing surface and an outer flange surface arranged radially therefrom. The skirt is installed in the inner sealing surface. The guide mechanism is a pull-off plate structure. One end of the pull-off plate structure is connected to the outer surface of the main body, and the other end is connected to the outer surface of the outer flange surface.

[0008] Preferably, the inner ring sealing surface protrudes axially from the outer ring flange surface along the end cover flange, and a pressure ring is also provided on the inner ring sealing surface, the shape of which is adapted to the shape of the inner ring sealing surface.

[0009] Preferably, the pressure ring presses the cover skirt into the inner ring sealing surface using sealant or screws.

[0010] Preferably, the tear-off piece structure is a stepped structure, which includes a cover connecting part, a guide part, and a flange connecting part that are bent vertically and connected in sequence. The cover connecting part is connected to the outer surface of the cover body, the flange connecting part is connected to the outer surface of the outer ring flange, and the guide part has a first guide notch and a second guide notch on both sides in the radial direction.

[0011] Preferably, the cover connecting part is located on the cover body near the cover skirt.

[0012] Preferably, the length of the cover connection portion is greater than the length of the flange connection portion.

[0013] Preferably, the thickness of the flange connection portion matches the axial height of the end cover body.

[0014] Preferably, the specific dimensional parameters of the pull-off plate structure include: the thickness of the cover connecting part, the guide part, and the flange connecting part is 0.3-5mm, the length of the cover connecting part is 5-100mm, the length of the flange connecting part is 5-80mm, and the height of the guide part is 5-150mm.

[0015] Preferably, the cover connecting part and the guide part are connected by a smooth convex arc transition connecting part, and the flange connecting part and the guide part are connected by a smooth concave arc transition connecting part.

[0016] Preferably, both the first guide notch and the second guide notch are angular notch structures.

[0017] Preferably, the depth of the first guide notch and the second guide notch is 10%-49% of the radial width of the guide portion, and the opening angle of the first guide notch and the second guide notch is 15°-89°.

[0018] Preferably, the tensile sheet structure is integrally molded from any one of stainless steel, aluminum alloy, steel, or fiber-reinforced composite materials.

[0019] Preferably, a metal block is pre-embedded on the end cap body for connection with the guide mechanism, or holes are drilled in the end cap body to achieve connection with the guide mechanism, or both are used in combination.

[0020] Preferably, the cover connecting part is connected to the cover body by screws, adhesive bonding, or a combination of both.

[0021] Preferably, the flange connection is connected to the outer flange face by screws.

[0022] Preferably, the cover connecting part and the cover body have corresponding connecting screw holes, and the flange connecting part and the outer flange surface have corresponding connecting screw holes.

[0023] Preferably, a weak groove is formed on the main body of the cover, and the thickness of the main body of the cover at the weak groove is less than the thickness of other areas of the main body of the cover.

[0024] Preferably, a plurality of weak grooves are provided, and a plurality of guide structures are provided.

[0025] Preferably, the number of weak grooves is matched with the number of guide structures.

[0026] More preferably, the end cap meets the requirements of the launch box system, including pressure resistance, opening performance, and environmental adaptability.

[0027] More preferably, the inner and outer surfaces of the end cap are provided with an auxiliary functional layer and a three-proof coating in sequence from one side of the end cap.

[0028] More preferably, the auxiliary functional layer is any one or more of an electromagnetic shielding coating, a sealing coating, or an ablation-resistant coating.

[0029] More preferably, the construction process of the auxiliary functional layer and the three-proof coating is determined according to the coating system.

[0030] More preferably, the auxiliary functional layer is prepared by any one of thermal spraying, air spraying or brushing processes.

[0031] Further, the conformal coating is prepared from conformal paint through any of the following processes: thermal spraying, air spraying, or brushing.

[0032] Preferably, a guide mechanism is installed on the end cover flange and the end cover body. When the end cover breaks during launch, the end cover fragments fly out along a preset direction under the constraint and guidance of the guide mechanism, effectively avoiding collision damage to surrounding equipment and personnel.

[0033] Preferably, the number of fragments formed after the end cap breaks is one, two, three, or four.

[0034] Preferably, the end cap body has a circular, square, or other shapes.

[0035] Preferably, the end cap can be a flat plate or have a certain height in the height direction.

[0036] More preferably, the shape, height, and number of fragments of the end cap can be freely combined.

[0037] More preferably, when the end cap is a circular flat plate, it is configured to be a single piece that flies out.

[0038] More preferably, when the number of fragments after the end cap breaks is one, the guide mechanism can be set to one, and its installation position is determined according to the preset movement direction of the fragment; multiple different guide mechanisms can also be set to achieve certain special movement trajectories.

[0039] More preferably, when the number of fragments after the end cap breaks is two, the number of weak grooves provided on the main body of the cap is one, and two guide mechanisms are provided. The weak grooves divide the main body of the cap into two independent breaking areas, and the two guide mechanisms are respectively assembled in the two independent breaking areas. The installation position of each guide mechanism is determined according to the preset movement direction of the fragments.

[0040] More preferably, when the number of fragments after the end cap breaks is three, the number of weak grooves provided on the main body of the cap is three, and the number of guide mechanisms is three; the weak grooves divide the main body of the cap into three independent breaking areas, and the three fragment guide mechanisms are respectively assembled in the three independent breaking areas, and the installation position of each guide mechanism is determined according to the preset fragment movement direction.

[0041] More preferably, when the number of fragments after the end cap breaks is four, the number of weak grooves provided on the main body of the cap is four, and the number of guide mechanisms is four; the weak grooves divide the main body of the cap into four independent breaking areas, and the four fragment guide mechanisms are respectively assembled in the four independent breaking areas, and the installation position of each guide mechanism is determined according to the preset fragment movement direction.

[0042] More preferably, by adjusting the number and orientation of the guide mechanisms, as well as the opening angle of the first and second guide notches, the movement direction of the launch box end cover fragments can be controlled; by adjusting the depth of the first and second guide notches, the movement distance of the launch box end cover fragments can be controlled, and the movement direction of the fragments can be finely adjusted.

[0043] More preferably, the launch box end cap is located at the front opening of the launch box body and is connected to the launch box body via the end cap flange.

[0044] In this invention, the outer surface refers to the side of the launch box end cover that faces away from the launch box body, and the inner surface refers to the side of the launch box end cover that faces the launch box body.

[0045] This invention achieves the function of guiding the movement of fragments by setting a guiding mechanism on the end cap body and end cap flange. In this invention, the guiding mechanism adopts a stepped, bent plate-like structure, with its cap body connection fixed to the end cap body and its flange connection fixed to the end cap flange, forming a rigid restraint on the cap body. This ensures that even if the end cap breaks, the fragments remain constrained by the mechanism and do not deviate from the preset movement range until the guiding mechanism breaks. The guiding part, as the core functional area, has guiding notches on both sides. The pre-defined notch angles define the basic direction of fragment movement, which is coordinated with the number and orientation of the guiding mechanisms. Flexible adjustments further lock the directional trajectory of each fragment; at the same time, the depth design of the guide notch directly determines the fracture threshold of the tensile piece. When the fragment moves to the preset position, it fractures precisely due to stress concentration at the notch, releasing the kinetic energy of the fragment's movement, and controlling the magnitude of the kinetic energy through the notch depth, thereby controlling the movement distance. Furthermore, the deviation in the movement direction can be corrected through fine-tuning of the depth; in addition, each independent crushing area is equipped with a corresponding guide mechanism according to the requirements, ensuring that multiple fragments fly out in a directional manner along a preset trajectory, ultimately achieving dual control over the movement direction and distance of the fragments, and avoiding the risk of collision.

[0046] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a launch box end cover by setting a guide mechanism between the end cover body and the end cover flange, and connecting the two ends of the guide mechanism to the end cover body and the end cover flange respectively, thereby realizing the directional movement control of the launch box end cover fragments. The overall structure is simple and the manufacturing cost is low. It can effectively solve the problem of disorderly splashing of traditional detachable and fragile cover fragments, and avoid collision damage to surrounding equipment and personnel.

[0047] (2) The guiding mechanism of the present invention is a stepped breakable structure. Its cover connecting part and flange connecting part are connected to the end cover cover and the end cover flange respectively to form a reliable rigid restraint. The guiding part has a guiding notch on both sides. When the end cover cover breaks, the fragments will be restrained by the guiding mechanism and will not be able to leave the preset movement range until they move to the preset position. The guiding notch on both sides of the guiding part will break precisely due to stress concentration, so that the fragments fly out in the preset direction. At the same time, by adjusting the angle and depth of the guiding notch, as well as the number and orientation of the guiding mechanism, and with the synergistic effect of the weak groove of the cover, the number of fragments, the movement direction and the flight distance can be flexibly controlled, and finally the multiple control of the fragment movement can be achieved, further improving the safety of use.

[0048] (3) The present invention does not require modification of the main structure of the existing detachable and fragile cap. It only requires the addition of a pull-out guide mechanism to the mature original structure. This guide mechanism is not only simple in structure and low in cost, but also adaptable to various installation methods such as screw connection and glued connection. It is easy to operate and is more suitable for large-scale promotion and application than the technically complex and expensive non-detachable end cap.

[0049] (4) The missile launch box with the launch box end cover of the present invention can accurately match the safety requirements of equipment-intensive scenarios such as shipborne and vehicle-mounted launch boxes, effectively solve the pain point of high risk of fragment collision in such scenarios, and greatly improve the combat safety and environmental adaptability of the missile launch system. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the overall structure of the launch box end cover of the present invention (a single piece of flying-out square flat plate end cover). Figure 2 This is a schematic diagram of the guiding mechanism of the present invention; Figure 3 This is a schematic diagram of the overall structure of the integral flying-out circular flat plate end cap of the present invention; Figure 4 This is a schematic diagram of the overall structure of the two outward-firing square flat end caps of the present invention. In the figure: 1-End cover flange; 11-Inner ring sealing surface; 12-Outer ring flange surface; 13-Pressure ring; 2-End cover body; 3-Guide mechanism; 31-Cover body connection; 32-Guide part; 321-First guide notch; 322-Second guide notch; 33-Flange connection; 34-Smooth convex arc transition connection; 35-Smooth concave arc transition connection; 4-Weak groove. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0055] Example 1 This embodiment provides a launch box end cap with fragment directional motion function, such as Figure 1As shown, it includes an end cap flange 1, an end cap body 2, and a guide mechanism 3. The end cap flange 1 is arranged around the outer edge of the end cap body 2. The two ends of the guide mechanism 3 are connected to the end cap flange 1 and the end cap body 2, respectively. The end cap body 2 has a cap body body and a cap body skirt formed around the outer edge of the cap body body. The end cap flange 1 has an inner ring sealing surface 11 and an outer ring flange surface 12 arranged in sequence along its own radial direction. The cap body skirt is adapted to be installed in the inner ring sealing surface 11. The guide mechanism 3 adopts a tear-off plate structure. One end of the tear-off plate structure is connected to the outer surface of the cap body body, and the other end is connected to the outer surface of the outer ring flange surface 12.

[0056] Example 2 This embodiment provides a launch box end cover with fragment directional motion function, including end cover flange 1, end cover body 2, and guide mechanism 3.

[0057] In this embodiment, the end cover flange 1 is coaxially wrapped around the outer edge of the end cover body 2. It is provided with an inner ring sealing surface 11 and an outer ring flange surface 12 in sequence along its own radial direction, and the inner ring sealing surface 11 protrudes from the outer ring flange surface 12 along the axial direction of the end cover flange 1.

[0058] In this embodiment, the end cap 2 includes a main body and a skirt formed around the outer edge of the main body. The skirt is adapted to be installed inside the inner ring sealing surface 11, and a pressure ring 13 that matches the shape of the inner ring sealing surface 11 is pressed on the top of the skirt. The skirt is firmly pressed into the inner ring sealing surface 11 by sealant or screws.

[0059] In this embodiment, as Figure 2 As shown, the guide mechanism 3 adopts a stepped breakable plate structure, which consists of a cover connecting part 31, a guide part 32 and a flange connecting part 33 connected vertically in sequence. The length of the cover connecting part 31 is greater than that of the flange connecting part 33, and the cover connecting part 31 and the guide part 32 are connected by a smooth convex arc transition connecting part 34, and the flange connecting part 33 and the guide part 32 are connected by a smooth concave arc transition connecting part 35.

[0060] In this embodiment, the cover connecting part 31 is fixedly connected to the outer surface of the cover body, and the flange connecting part 33 is fixedly connected to the outer surface of the outer ring flange surface 12; the guide part 32 has a first guide notch 321 and a second guide notch 322 on its radial sides respectively. Both are angular notch structures, and the notch depth accounts for 10%-49% of the radial width of the guide part 32. The notch opening angle is 15°-89°.

[0061] In this embodiment, the cover connecting part 31 and the outer surface of the cover body can be fixed by screw connection, adhesive bonding or a combination of both, and the flange connecting part 33 is fixed to the outer surface of the outer ring flange surface 12 by screws; correspondingly, the cover connecting part 31 and the cover body are provided with connecting screw holes with one-to-one positions, and the flange connecting part 33 and the outer ring flange surface 12 are also provided with connecting screw holes with one-to-one positions, to ensure the accuracy and firmness of the screw connection.

[0062] In this embodiment, the tensile sheet structure is integrally molded from any one of stainless steel, aluminum alloy, steel, or fiber-reinforced composite materials.

[0063] Example 3 This embodiment provides a launch box end cover with fragment directional movement function. The main body of the cover has several weak grooves 4. The thickness of the main body of the cover at these weak grooves 4 is smaller than that of other areas, which is used to guide the number and shape of fragments when the end cover breaks; several guide mechanisms 3 are provided accordingly.

[0064] This embodiment controls the movement direction of the launch box end cover fragments by adjusting the number and orientation of the guide mechanism 3, as well as the opening angle of the first guide notch 321 and the second guide notch 322; and controls the movement distance of the launch box end cover fragments by adjusting the notch depth of the first guide notch 321 and the second guide notch 322, while also allowing for fine-tuning of the movement direction of the fragments.

[0065] This embodiment, by reasonably setting the number and location of the weak grooves 4, and correspondingly adjusting the number and orientation of the guide mechanism 3, can flexibly control the number of fragments after the end cap breaks, adapting to the usage needs of different scenarios.

[0066] Example 5 This embodiment provides a single-piece flying circular flat plate end cap with fragment directional movement function, wherein the guide mechanism 3 is configured as one unit, such as... Figure 3 As shown, The specific structure of the launch box end cover in this embodiment is as follows: the end cover body 2 is made of glass fiber reinforced epoxy resin, and the end cover flange 1 is made of 316L stainless steel; the end cover flange 1 and the end cover body 2 are connected together by polysulfide sealant and standard parts; the pull tab of the guide mechanism 3 is made of 304 stainless steel, with a thickness of 1mm and a width of 6mm, and the remaining width at the notch is designed to be 3mm.

[0067] In this embodiment, the end cap 2 is assembled with a fastener through a drilling process to achieve a stable connection with the guide mechanism 3. At the same time, polysulfide rubber is applied to the drilling position to ensure the airtightness requirements of the end cap. The guide mechanism 3 is connected to the end cap flange 1 with screws and a long metal washer, making full use of the original mounting holes of the end cap without the need for additional drilling. The long metal washer has a pre-set M8 threaded hole to achieve precise assembly between the end cap flange 1 and the guide mechanism 3.

[0068] In terms of performance testing, the static opening test results showed that the end cap fragments flew out obliquely upwards towards the installation side of the guide mechanism 3, and the landing point was located 5m behind the guide mechanism 3, which conformed to the preset trajectory. In the actual shipborne launch test, the fragments moved strictly along the preset direction and finally landed in the sea without colliding with the shipborne equipment, which verified the safety and reliability of the structure in actual application.

[0069] Example 6 This embodiment provides a two-piece flying-out square flat end cap with fragment directional movement function, such as... Figure 4 As shown, the end cap 2 has a weak groove 4 along its central axis, and two guide mechanisms 3 are provided. The weak groove 4 divides the main body of the cap into two independent crushing areas, and the two guide mechanisms are respectively assembled in the two independent crushing areas.

[0070] The specific configuration of the launch box end cover in this embodiment is as follows: the end cover body 2 is made of glass mesh reinforced epoxy foam, and the end cover flange 1 is still made of 304 stainless steel; the pull plates of the two guide mechanisms 3 are both made of 304 stainless steel, and their thickness is uniformly designed to be 0.8mm, with the remaining width at the narrowest point being 5mm.

[0071] In terms of the connection structure, the end cap body 2 is assembled with fasteners through a drilling process to achieve a stable connection with the guide mechanism 3. At the same time, polysulfide rubber is applied to the drilling position to ensure that the end cap meets the airtightness requirements. The end cap flange 1 directly adopts M8 specification fasteners to complete the precise assembly with the guide mechanism 3. The connection method is simple and reliable.

[0072] The static opening test results showed that the end cap fragments flew out in a flipped state. The landing point of each fragment was at an angle of 15° with the axis of the corresponding break, and the distance from the break to its corresponding break was 2m. The movement trajectory of the fragments was completely consistent with the preset direction, which verified the effectiveness of the structure in controlling the orientation of multiple fragments.

[0073] Example 7 This embodiment provides a two-piece flying square flat end cap with fragment directional movement function. The launch box end cap with fragment directional movement function, as in any of embodiments 1-6, is provided at the front opening of the launch box body, and the launch box end cap is connected to the launch box body through end cap flange 1.

[0074] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A launch box end cap with fragment directional motion function, characterized in that, It includes an end cap flange (1), an end cap body (2), and a guide mechanism (3). The end cap flange (1) is arranged around the outer edge of the end cap body (2), and the two ends of the guide mechanism (3) are respectively connected to the end cap flange (1) and the end cap body (2). The end cap body (2) includes a main body and a skirt surrounding the outer edge of the main body. The end cap flange (1) includes an inner ring sealing surface (11) and an outer ring flange surface (12) arranged in sequence along its radial direction. The skirt is installed in the inner ring sealing surface (11). The guide mechanism (3) is a pull-off plate structure. One end of the pull-off plate structure is connected to the outer surface of the main body, and the other end is connected to the outer surface of the outer ring flange surface (12).

2. The launch box end cover with fragment directional movement function according to claim 1, characterized in that, The inner ring sealing surface (11) protrudes from the outer ring flange surface (12) along the axial direction of the end cover flange (1). A pressure ring (13) is also provided on the inner ring sealing surface (11). The shape of the pressure ring (13) is adapted to the shape of the inner ring sealing surface (11). The pressure ring (13) presses the cover skirt into the inner ring sealing surface (11) by sealant or screws.

3. The launch box end cover with fragment directional movement function according to claim 1, characterized in that, The pull-off plate structure is a stepped structure. The pull-off plate structure includes a cover connecting part (31), a guide part (32), and a flange connecting part (33) that are connected vertically in sequence. The cover connecting part (31) is connected to the outer surface of the cover body. The flange connecting part (33) is connected to the outer surface of the outer ring flange face (12). The guide part (32) has a first guide notch (321) and a second guide notch (322) on both sides in its radial direction.

4. The launch box end cover with fragment directional motion function according to claim 3, characterized in that, The length of the cover connecting part (31) is greater than the length of the flange connecting part (33). The cover connecting part (31) and the guide part (32) are connected by a smooth convex arc transition connecting part (34). The flange connecting part (33) and the guide part (32) are connected by a smooth concave arc transition connecting part (35).

5. A launch box end cover with fragment directional motion function according to claim 3, characterized in that, The first guide notch (321) and the second guide notch (322) are both angular notch structures. The notch depth of the first guide notch (321) and the second guide notch (322) is 10%-49% of the radial width of the guide part (32). The notch opening angle of the first guide notch (321) and the second guide notch (322) is 15°-89°.

6. A launch box end cover with fragment directional movement function according to claim 3, characterized in that, The tensile sheet structure is integrally molded from any one of stainless steel, aluminum alloy, steel, or fiber-reinforced composite materials.

7. A launch box end cover with fragment directional motion function according to claim 3, characterized in that, The cover connecting part (31) is connected to the cover body by screws, glue, or a combination of both, and the flange connecting part (33) is connected to the outer flange face (12) by screws.

8. A launch box end cover with fragment directional motion function according to claim 3, characterized in that, The cover connecting part (31) and the cover body have corresponding connecting screw holes, and the flange connecting part (33) and the outer flange surface (12) have corresponding connecting screw holes.

9. A launch box end cover with fragment directional movement function according to claim 1, characterized in that, The cover body has a weak groove (4) and the thickness of the cover body at the weak groove (4) is less than the thickness of other areas of the cover body. Several weak grooves (4) are provided, and several guide mechanisms (3) are provided.

10. A launch box end cover with fragment directional motion function according to claim 1, characterized in that, The launch box end cap is located at the front opening of the launch box body and is connected to the launch box body through the end cap flange (1).

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