Fragile cover

Abstract

The fragile cover comprises structural layers, a functional layer and a pressing plate, the structural layers are in the form of honeycomb layers and skin, the functional layer is arranged between the honeycomb layers of the two structural layers, by means of the structural advantages of the honeycomb layers, the structural weight is reduced, meanwhile, the functional layer is designed to increase rigidity, the stability of the fragile cover is improved, and the service life of the fragile cover is prolonged. In addition, the functional layer has the advantages of being neat in fracture, small in residue and the like, the function layer is beneficial to avoiding an object barrel outlet channel, and interference is prevented. The manufacturing process can be simplified, and the method is suitable for mass production and has the advantages of controllable quality, high reliability and the like.

Description

Technical Field

[0001] The present application relates to the field of aerospace equipment manufacturing, and in particular to a fragile cover. Background Art

[0002] The fragile cover is a component of a ground ejector, such as an ejector cylinder or box, and is mainly used to protect items in the cylinder / box, maintain the air pressure in the cylinder / box, and prevent impurities from interfering with the items. During ejection, the fragile cover can be destroyed along the set path. The fragile cover needs to leave neat cracks without any residue and without damaging the front end of the item after destruction, thereby allowing the item to fly out of the channel. In addition, the fragile cover also needs to be able to withstand a certain amount of external pressure under the interference of the adjacent cylinder without deformation, to prevent damage to the item.

[0003] In the prior art, firstly, the fragile cover made of foam material has the problem of high requirements for machining the weakening groove and difficulty in ensuring dimensional accuracy, and high requirements for consistency of the foaming process, and there is a risk of damage to the non-weakening groove parts; secondly, the thin plate fragile cover made of composite material has weak rigidity of the cover body, which is easy to deform under the action of external pressure, causing interference to the items in the box / drum. Utility Model Content

[0004] The embodiment of the present application provides a fragile cover, and the fragile cover of the present application has high strength, a smooth fracture and a light structure.

[0005] An embodiment of the present application discloses a fragile cover, comprising: a structural layer, at least two structural layers are arranged opposite to each other along a first direction, the structural layer comprises a honeycomb layer and a skin, the skin is arranged on both sides of the honeycomb layer along the first direction; a functional layer, the functional layer is arranged between the two structural layers along the first direction; a pressure plate, the pressure plate is connected to the functional layer along the first direction, and a plurality of mounting holes are arranged on the pressure plate.

[0006] The fragile cover of the present application has at least the following beneficial effects:

[0007] The fragile cover of the present application includes a structural layer, a functional layer and a pressure plate. The structural layer is in the form of a honeycomb layer and a skin. The functional layer is arranged between the honeycomb layers of the two structural layers. The structural advantages of the honeycomb layer are utilized to reduce the structural weight. At the same time, the functional layer is designed to increase the rigidity, which is beneficial to improving the stability of the fragile cover and avoiding deformation of the cover body under external pressure. In addition, the functional layer of the present application has the characteristics of neat fracture and little residue, which is beneficial to clear the channel for objects to exit the tube and prevent interference. The manufacturing process can be simplified, which is suitable for mass production and has the advantages of controllable quality and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0009] Figure 1 is a schematic diagram of an explosion of a frangible cover in some embodiments of the present application;

[0010] Figure 2 is a schematic diagram of the structure of a frangible cover in some embodiments of the present application;

[0011] Figure 3 yes Figure 2 A top view of

[0012] Figure 4 yes Figure 1 Top view of the middle honeycomb layer;

[0013] Figure 5 yes Figure 4 AA view in;

[0014] Figure 6 yes Figure 5 The enlarged view of point B in the middle;

[0015] Figure 7 yes Figure 5 Enlarged view of point C in the middle;

[0016] Description of the reference numerals is as follows:

[0017] 1. structural layer; 11. honeycomb layer; 111. honeycomb block; 112. sealing layer; 12. skin;

[0018] 2. Functional layer; 21. Fiberboard;

[0019] 3. Press plate; 31. Mounting hole;

[0020] 4. Buffer pad; 41. First weakening groove; 42. Second weakening groove; 4a. Intersection position. DETAILED DESCRIPTION

[0021] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0023] like Figure 1 and Figure 2 As shown, the embodiment of the present application discloses a fragile cover, which includes a structural layer 1, a functional layer 2 and a pressing plate 3;

[0024] At least two of the structural layers 1 are arranged opposite to each other along a first direction, and the structural layer 1 comprises a honeycomb layer 11 and a skin 12, and the skin 12 is respectively arranged on both sides of the honeycomb layer 11 along the first direction;

[0025] The functional layer 2 is arranged between the two structural layers 1 along the first direction;

[0026] The pressing plate 3 is connected to the functional layer 2 along a first direction, and a plurality of mounting holes 31 are provided on the pressing plate 3 .

[0027] There are two structural layers 1 , which are coaxially arranged along a first direction. The structural layers 1 include a honeycomb layer 11 and a skin 12 . The skin 12 is bonded to two sides of the honeycomb layer 11 along the first direction.

[0028] The first direction is configured as a thickness direction of the fragile cover.

[0029] The outer diameter of the functional layer 2 is greater than the outer diameter of the structural layer 1 , and the functional layer 2 is coaxially arranged with the structural layer 1 . The functional layer 2 is arranged between the honeycomb layers 11 of the two structural layers 1 .

[0030] The pressing plate 3 is coaxially connected to the functional layer 2 , and a mounting hole 31 is provided on the pressing plate 3 , and the mounting hole 31 can facilitate the connection and assembly of the fragile cover with the external structure.

[0031] The fragile cover of the embodiment of the present application includes a structural layer 1, a functional layer 2 and a pressure plate 3. The structural layer 1 is in the form of a honeycomb layer 11 and a skin 12. The functional layer 2 is arranged between the honeycomb layers 11 of the two structural layers 1. The structural advantages of the honeycomb layer 11 are utilized to reduce the structural weight. At the same time, the functional layer 2 is designed to increase the rigidity, which is beneficial to improving the stability of the fragile cover and avoiding deformation of the cover body under external pressure. In addition, the functional layer of the embodiment of the present application has the characteristics of neat fracture and little residue, which is beneficial to clear the channel for objects to exit the tube and prevent interference. The manufacturing process can be simplified, which is suitable for mass production and has the advantages of controllable quality and high reliability.

[0032] Preferably, Figures 2 to 4 As shown, the honeycomb layer 11 includes a plurality of honeycomb blocks 111 arranged circumferentially; the skin 12 is bonded to both sides of the honeycomb blocks 111 .

[0033] The honeycomb layer 11 includes four honeycomb blocks 111 , and the four honeycomb blocks 111 are distributed at equal intervals along the circumferential direction (ie around the first direction).

[0034] Wherein, the two sides of each honeycomb block 111 are bonded with a skin 12 , and the honeycomb block 111 is provided with a plurality of regular hexagonal honeycomb holes.

[0035] The material of the skin 12 is glass fiber, carbon fiber, etc., and the honeycomb block 111 is aramid honeycomb or aluminum honeycomb.

[0036] In the embodiment of the present application, the honeycomb layer 11 is a flat plate structure as a whole, and adopts the form of a thin skin 12 and a honeycomb block 111, which can effectively reduce the weight of the structure and is easy to manufacture and assemble.

[0037] Preferably, Figure 4 As shown, a sealing layer 112 is provided on the outer peripheral side of the honeycomb block 111 .

[0038] The top view shape of the honeycomb block 111 is a 90-degree fan-shaped. The outer peripheral side of the honeycomb block 111 has three side walls, each of which is provided with a sealing layer 112. During specific production and manufacturing, the sealing layer 112 can be obtained by sealing the honeycomb block 111 with sealing glue.

[0039] Among them, Figure 4 As shown, a predetermined gap (as shown by H1 in the figure) is provided between two circumferentially adjacent honeycomb blocks 111 , and the predetermined gap can facilitate the honeycomb layer 11 to be broken along a predetermined path.

[0040] In the embodiment of the present application, the stability of the structure when it is broken can be improved by sealing the honeycomb block 111 with glue. In the embodiment of the present application, a sealing glue layer 112 is arranged around the outer periphery of the honeycomb block 111, which is beneficial to improve the rigidity of the overall structure and reduce deformation when subjected to external pressure.

[0041] Preferably, Figure 5 and Figure 6 As shown, the functional layer 2 includes a fiberboard 21 disposed between the two structural layers 1 .

[0042] Among them, the functional layer 2 adopts a composite laminate structure (that is, the fiberboard 21 in the embodiment of the present application), which is formed by hot pressing of unidirectional asphalt-based carbon fiber (elongation at break is less than 0.5%) prepreg, and can be broken under the action of the bursting force, and the fracture reflects the crack flatness characteristics of the low fracture strain material, with only small fracture residues. Based on the weakening groove direction (that is, the second direction or the third direction in the embodiment of the present application), the fiber direction of the unidirectional asphalt-based carbon fiber prepreg is arranged orthogonally at 0 / 90°. In some embodiments, the material of the fiberboard is an ultra-high modulus mesophase asphalt-based carbon fiber composite material, which has the characteristics of high strength and low fracture strain.

[0043] The fiberboard 21 has an overall circular shape, and its outer diameter is larger than the structural layer 1 . The fiberboard 21 is bonded between the honeycomb layers 11 of the two structural layers 1 , and the fiberboard 21 is coaxial with the structural layer 1 .

[0044] In the embodiment of the present application, the functional layer 2 adopts the fiberboard 21, which can ensure that it remains stable without being damaged under the action of external and internal pressures, and has good stability. The structural layer 1 and the functional layer 2 (that is, the fiberboard 21) are combined. The fiberboard 21 is made of low fracture strain material. Under the action of bursting, the fracture residue is reduced and the risk of cover breaking is reduced.

[0045] Preferably, please refer to Figure 1 The pressing plate 3 is annular in shape, and corresponding mounting holes 31 are provided on the pressing plate 3 and the fiberboard 21 .

[0046] The pressing plate 3 is bonded to the edge of the fiberboard 21 along the first direction, and a plurality of mounting holes 31 are provided on the edge of the pressing plate 3 and the fiberboard 21 . The plurality of mounting holes 31 are arranged in a circle along the circumferential direction.

[0047] There are two pressing plates 3 , which are respectively bonded to two sides of the fiberboard 21 , and the pressing plates 3 are coaxial with the fiberboard 21 .

[0048] In the embodiment of the present application, the pressing plate 3 and the fiberboard 21 are bonded together, and the structural layer 1 and the fiberboard 21 are also bonded together, which can facilitate the assembly and manufacture of the overall structure. The multiple mounting holes 31 provided on the pressing plate 3 can provide a connection position for the installation of the fragile cover.

[0049] Preferably, the pressing plate 3 is made of aluminum alloy.

[0050] In the embodiment of the present application, the material of the pressure plate 3 is selected to be aluminum alloy, which can further reduce the weight of the structure while having a certain strength to ensure stability during connection.

[0051] Preferably, Figure 3 and Figure 5 As shown, the fragile cover of the embodiment of the present application also includes a buffer pad 4, which is arranged on the outer side of a structural layer 1, and the buffer pad 4 is provided with a first weakening groove 41 along the second direction and a second weakening groove 42 along the third direction, and the first direction, the second direction and the third direction intersect each other.

[0052] Among them, the buffer pad 4 is arranged on the side of the structural layer 1 away from the functional layer 2. The buffer pad 4 has a certain elastic deformation ability, and its material can be selected as a material with elasticity such as rubber. The specific material will not be described in detail in the embodiment of this application.

[0053] The first weakening groove 41 and the second weakening groove 42 are both through grooves, and the first weakening groove 41 and the second weakening groove 42 intersect vertically. From the above description, it can be seen that there is a predetermined gap H1 between the two honeycomb blocks 111, and the first weakening groove 41 or the second weakening groove 42 is aligned with the predetermined gap. The alignment here can be understood as projection overlap (i.e., projection overlap in the first direction).

[0054] The first direction, the second direction and the third direction intersect each other perpendicularly.

[0055] In the embodiment of the present application, when the fragile cover needs to be broken, the buffer pad 4 is provided to avoid direct impact from external objects, which is beneficial to reduce the impact on the object during collision and protect the head of the object. At the same time, the first weakening groove 41 and the second weakening groove 42 are provided on the buffer pad 4 to facilitate the buffer pad 4 to be broken along a predetermined path.

[0056] Preferably, Figure 3 As shown, the first weakened groove 41 and the second weakened groove 42 of the buffer pad 4 have an intersection position 4 a , and the intersection position 4 a is coaxially arranged with the structural layer 1 .

[0057] The intersection position 4 a is configured as the center position of the buffer pad 4 .

[0058] In the embodiment of the present application, the buffer pad 4 is arranged at the center position, which can be directly impacted by external objects. At the same time, the buffer pad 4 can be broken according to the separation area of ​​the first weakening groove 41 and the second weakening groove 42.

[0059] Preferably, Figure 7 As shown, the depths of the first weakening groove 41 and the second weakening groove 42 of the buffer pad 4 are both D1; the thickness of the buffer pad 4 is D2, and D1 is equal to D2.

[0060] The depths of the first weakened groove 41 and the second weakened groove 42 in the first direction are both defined as D1 , the thickness of the buffer pad 4 in the first direction is defined as D2 , and D1 is equal to D2 .

[0061] In the embodiment of the present application, by designing the depth of the first weakening groove 41 and the second weakening groove 42 , it is possible to ensure that the buffer pad 4 is broken smoothly, and it is also possible to ensure that the buffer pad 4 can be designed in blocks.

[0062] Among them, the range of D2 in the embodiment of the present application is between 5mm and 10mm.

[0063] The present application embodiment discloses a fragile cover. The fragile cover of the present application embodiment can be used on a launch tube (not shown), such as Figures 1 to 7 As shown, the fragile cover includes a structural layer 1, a functional layer 2, a pressure plate 3 and a buffer pad 4; the connection relationship and position relationship of the above components have been described above and will not be repeated here. The following is a description of the working principle of the fragile cover of an embodiment of the present application.

[0064] When the launch cylinder is working, the object in the launch cylinder impacts the buffer pad 4 upwards, breaks the structural layer 1 and the functional layer 2 in sequence, and then rushes upwards. At this time, the fragile cover is broken and the work is completed.

[0065] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A fragile cover, characterized in that: include: A structural layer (1), at least two of the structural layers (1) are arranged opposite to each other along a first direction, the structural layer (1) comprises a honeycomb layer (11) and a skin (12), and the skin (12) is arranged on both sides of the honeycomb layer (11) along the first direction; A functional layer (2), the functional layer (2) being arranged between the two structural layers (1) along a first direction; A pressing plate (3), the pressing plate (3) being connected to the functional layer (2) along a first direction, and a plurality of mounting holes (31) being provided on the pressing plate (3).

2. The frangible cover according to claim 1, characterized in that: The honeycomb layer (11) comprises a plurality of honeycomb blocks (111) arranged circumferentially; the skin (12) is bonded to both sides of the honeycomb blocks (111).

3. The frangible cover according to claim 2, characterized in that: A sealing glue layer (112) is provided on the outer peripheral side of the honeycomb block (111).

4. The frangible cover according to claim 1, characterized in that: The functional layer (2) comprises a fiberboard (21) arranged between the two structural layers (1).

5. The frangible cover according to claim 4, characterized in that: The pressing plate (3) is annular in shape, and corresponding mounting holes (31) are provided on the pressing plate (3) and the fiberboard (21).

6. The frangible cover according to claim 5, characterized in that: The material of the pressing plate (3) is aluminum alloy.

7. The frangible cover according to any one of claims 1 to 6, characterized in that: The invention also comprises a buffer pad (4), wherein the buffer pad (4) is arranged on the outer side of a structural layer (1), and the buffer pad (4) is provided with a first weakening groove (41) along the second direction and a second weakening groove (42) along the third direction, and the first direction, the second direction and the third direction intersect each other.

8. The frangible cover according to claim 7, characterized in that: The first weakening groove (41) and the second weakening groove (42) of the buffer pad (4) have an intersection position (4a), and the intersection position (4a) is coaxially arranged with the structural layer (1).

9. The frangible cover according to claim 7, characterized in that: The depths of the first weakening groove (41) and the second weakening groove (42) of the buffer pad (4) are both D1; the thickness of the buffer pad (4) is D2, and D1 is equal to D2.

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