A transmitting box end cover capable of realizing electromagnetic shielding or telemetry wave-transparent function

Abstract

The application relates to a transmitting box end cover capable of realizing electromagnetic shielding or telemetry wave-transparent functions, comprising a cover body, one side surface of the cover body is provided with a first functional layer, the other side surface is provided with a second functional layer, and the first functional layer and the second functional layer are provided with three-proofing coatings away from one side of the cover body. Compared with the prior art, the transmitting box end cover can realize the two functions of electromagnetic shielding or telemetry wave-transparent by changing the material types of the first functional layer and the second functional layer without changing the size (thickness size) of the end cover, can conveniently realize one-line dual use, adapts to the use requirements of different loads of the same transmitting system, solves the problems that the production line must be reformed and size deviation is easily caused in the function adjustment of the end cover in the prior art, reduces the production cost, and improves the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of missile launch safety technology, and in particular to a launch box end cover that can achieve electromagnetic shielding or telemetry wave transmission function. Background Technology

[0002] Rapid launch technology is an important development trend in missile weapon systems. Currently, most missile models in my country have adopted launch canister (tube) launch technology, replacing the traditional bare missile launch method. This effectively improves the weapon system's anti-jamming capability and launch hit rate, and provides reliable support for missile storage, transportation, and launch.

[0003] As a key component of the launch box (tube), the end cap plays a vital role: during the storage phase, the end cap provides a sealing and protective function, effectively isolating the missile from external environmental interference, protecting the missile body, and extending the missile's storage life; during the launch phase, the end cap can quickly clear the launch channel, ensuring the missile can be launched smoothly without affecting launch accuracy and efficiency.

[0004] With the increasing demand for versatility in missile weapon systems, a single launch system needs to be compatible with multiple different types of payloads, such as missiles and rocket-assisted unmanned aerial vehicles (UAVs). Different payloads have significantly different functional requirements for the launch canister end caps: some payloads rely on the electromagnetic shielding function of the end caps to resist external electromagnetic interference and improve their survivability; others require the end caps to have telemetry transmission capabilities to ensure the normal transmission of telemetry signals. Therefore, electromagnetic shielding or telemetry transmission functions need to be configured for the end caps according to the functional requirements of different payloads.

[0005] In existing technologies, the aforementioned different functions are typically achieved by adjusting the functional coating on the end cap surface. This method achieves electromagnetic shielding performance by applying an electromagnetic shielding coating to an end cap that lacks electromagnetic shielding. However, adding an electromagnetic shielding layer in this way increases the number of processes required, necessitates production line modifications, and incurs high costs. It also causes changes in the end cap's dimensions, particularly in the thickness direction, resulting in significant weight variations and ultimately altering the overall system size and weight. This is unacceptable for systems with stringent requirements regarding length and weight (such as automotive systems). Furthermore, adding an electromagnetic shielding layer requires consideration of compatibility with the end cap body and the outermost conformal coating. In summary, electromagnetic shielding and telemetry transmission functions cannot be simultaneously manufactured in the same process. The overall process is complex, production costs are high, and it is difficult to guarantee dimensional consistency in batches of end caps. This fails to meet the stringent assembly dimensional accuracy requirements of launch systems, thus hindering standardized mass production of multi-specification functional end caps on a single production line. Summary of the Invention

[0006] The purpose of this invention is to provide a transmitter box end cap that can achieve either electromagnetic shielding or telemetry transmission functions. The end cap can achieve both electromagnetic shielding and telemetry transmission functions by changing the material of the functional layer without changing its own size. This allows for the production of end caps with both electromagnetic shielding and telemetry transmission functions on the same production line. It also solves the problem that adjusting the end cap function can easily lead to size changes, achieves end cap universality, and helps the system be compatible with different loads.

[0007] The objective of this invention can be achieved through the following technical solutions: The present invention provides a transmitter box end cover that can realize electromagnetic shielding or telemetry wave transmission function, including a cover body. A first functional layer is provided on one side surface of the cover body, and a second functional layer is provided on the opposite side surface. Both the first functional layer and the second functional layer are provided with a three-proof coating on the side away from the cover body.

[0008] Preferably, the first functional layer and the second functional layer are selected from any one or more of fiber-reinforced prepreg, metal foil, fiber fabric, ordinary adhesive film, and conductive adhesive film.

[0009] Preferably, the cover body is selected from one or more of fiber-reinforced prepreg, fiber fabric, and foam material.

[0010] Preferably, when the materials of the cover body, the first functional layer, and the second functional layer are fiber-reinforced prepregs, the fiber-reinforced prepregs are composed of a resin matrix and a fiber reinforcing material. The resin matrix is ​​selected from any one or more of epoxy resin, phenolic resin, polyurethane, and polyester resin, and the fiber reinforcing material is selected from any one or more of carbon fiber and fabric, glass fiber and fabric, aramid fiber and fabric, and ultra-high molecular weight polyethylene fiber and fabric.

[0011] Preferably, when the materials of the cover body, the first functional layer, and the second functional layer are fiber fabrics, the fiber fabrics are selected from any one or more of carbon fiber and fabrics, glass fiber and fabrics, aramid fiber and fabrics, and ultra-high molecular weight polyethylene fiber and fabrics.

[0012] Preferably, the metal foil is selected from one or more of aluminum, stainless steel, copper, zinc, and nickel.

[0013] Preferably, the foam material is any one or more of polyurethane foam, epoxy foam, and PMI foam.

[0014] Preferably, the transmitter box end cover is either an electromagnetic shielding transmitter box end cover or a telemetry wave transmission transmitter box end cover.

[0015] Preferably, the transmitter box end cap achieves electromagnetic shielding or telemetry transmission functions by changing the material types of the first and second functional layers, while the thickness of the first and second functional layers remains unchanged.

[0016] More preferably, the thickness of the main body of the cover is 0.5~30 mm, the thickness of the first functional layer is 0.05~2 mm, the thickness of the second functional layer is 0.05~2 mm, and the thickness of the three-proof coating is 0.05~0.2 mm.

[0017] Preferably, when the transmitter box end cover is an electromagnetically shielded transmitter box end cover and the electromagnetic shielding effectiveness is <20dB, at least one of the first functional layer and the second functional layer is selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

[0018] Preferably, when the transmitter box end cover is an electromagnetically shielded transmitter box end cover, and the electromagnetic shielding effectiveness is ≥20dB, the first functional layer and the second functional layer are each independently selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

[0019] Preferably, when the transmitter box end cover is a telemetry wave-transmitting transmitter box end cover, the first functional layer and the second functional layer are each independently selected from any one or more of fiber-reinforced prepreg, fiber fabric, and ordinary film.

[0020] Preferably, the cover body, the first functional layer, and the second functional layer are integrally formed.

[0021] More preferably, the molding method is selected from any one of hand lay-up molding, press hot pressing molding, autoclave molding, mold molding, and vacuum-assisted molding.

[0022] Preferably, the conformal coating is prepared by one or more of brushing or air spraying processes.

[0023] More preferably, the conformal coating is prepared by using conformal coating and based on one or more of brush coating or air spraying processes.

[0024] More preferably, the three-proof coating is selected from either acrylic polyurethane sea gray enamel or acrylic polyurethane military green enamel.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a transmitter box end cover that realizes electromagnetic shielding or telemetry wave transmission function. A first functional layer and a second functional layer are respectively provided on the two sides of the main body of the cover. By changing the selected materials of the first functional layer and the second functional layer, the electromagnetic shielding or telemetry wave transmission function can be realized without changing the size (thickness) of the end cover. It can adapt to the usage requirements of different loads of the same transmitter system and solve the problem that the adjustment of the end cover function in the prior art is prone to cause size deviation.

[0026] (2) The present invention does not require changing the overall structural design of the end cap or the thickness parameters of each layer. It can produce two different end caps with electromagnetic shielding function or telemetry transmission function by simply changing the material type of the functional layer: when the functional layer is made of materials with electromagnetic shielding performance such as metal foil or conductive film, the end cap achieves electromagnetic shielding function; when the functional layer is made of materials with telemetry transmission performance such as fiber-reinforced prepreg or ordinary film, the end cap achieves telemetry transmission function. It has strong adaptability and is easy to operate.

[0027] (3) Since the thickness of the first and second functional layers remains constant during material replacement, the overall size of the end cap will not change. This allows the two types of end caps to share the same production line without the need for complex parameter adjustments or equipment modifications. This not only greatly simplifies the production process, reduces operational difficulty, and improves production efficiency, but also avoids the additional costs associated with building separate production lines, adjusting process parameters, and adapting to end caps of different sizes. This effectively reduces the manufacturing cost of the launch box end caps while ensuring the dimensional consistency of end caps with different functions, achieving universal and standardized production of end caps, and perfectly adapting to the diverse payload requirements of the same launch system.

[0028] (4) The functional layer and the main body of the launch box end cover of the present invention are integrally formed, which is simple to operate and has a low cost. By simply changing the functional layer, it is easy to produce two different functions of end covers, namely electromagnetic shielding and telemetry wave transmission, on the same production line. It can be convenient to achieve dual use on one line, and the end cover can be universalized, which helps the system to be compatible with different loads (missiles, UAVs or others).

[0029] (5) The present invention provides a technical solution with constant thickness, simple route, and the ability to produce products with the same appearance but different functions using the same production line, which is low in cost and easy to operate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the end cap structure; In the diagram: 1-Main body of the cover; 2-First functional layer; 3-Second functional layer; 4-Proof coating; Figure 2 This is a schematic diagram of the monolithic, ejectable circular flat plate end cap structure in Example 1; Figure 3 This is a schematic diagram of the six-piece ejector-type circular flat plate end cap structure in Example 2. Detailed Implementation

[0031] This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiment.

[0032] Unless otherwise specified, the reagents, methods, instruments, and equipment used in this invention are conventional in the art. Unless otherwise specified, the reagents and materials used in the following examples are all commercially available.

[0033] A transmitter box end cover that can achieve electromagnetic shielding or telemetry wave transmission function, such as Figure 1 As shown, the device includes a cover body 1. A first functional layer 2 is provided on one side surface of the cover body 1, and a second functional layer 3 is provided on the opposite side surface. Both the first functional layer 2 and the second functional layer 3 have a conformal coating 4 on the side away from the cover body 1. The cover body 1, the first functional layer 2, and the second functional layer 3 are integrally molded. The molding method is selected from any one of hand lay-up molding, press hot pressing molding, autoclave molding, mold molding, and vacuum-assisted molding. The conformal coating 4 is prepared by any one or more of brushing or air spraying processes.

[0034] Wherein, the first functional layer 2 and the second functional layer 3 are selected from any one or more of fiber-reinforced prepreg, metal foil, fiber fabric, ordinary adhesive film, and conductive adhesive film, and the cover body 1 is selected from any one or more of fiber-reinforced prepreg, fiber fabric, and foam material. When the material of the cover body 1, the first functional layer 2, and the second functional layer 3 is fiber fabric, the fiber fabric is selected from any one or more of carbon fiber and fabric, glass fiber and fabric, aramid fiber and fabric, and ultra-high molecular weight polyethylene fiber and fabric; the metal foil is selected from any one or more of aluminum, stainless steel, copper, zinc, and nickel, and the foam material is any one or more of polyurethane foam, epoxy foam, and PMI foam.

[0035] The transmitter box end cover is either an electromagnetic shielding transmitter box end cover or a telemetry transmission transmitter box end cover. The end cover can achieve electromagnetic shielding or telemetry transmission functions by changing the material types of the first functional layer 2 and the second functional layer 3, while the thickness of the first functional layer 2 and the second functional layer 3 remains unchanged.

[0036] When the transmitter box end cover is an electromagnetically shielded transmitter box end cover and the electromagnetic shielding effectiveness is <20dB, at least one of the first functional layer 2 and the second functional layer 3 is selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

[0037] When the transmitter box end cover is an electromagnetically shielded transmitter box end cover and the electromagnetic shielding effectiveness is ≥20dB, the first functional layer 2 and the second functional layer 3 are each independently selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

[0038] When the transmitter box end cover is a telemetry transmission function transmitter box end cover, the first functional layer 2 and the second functional layer 3 are each independently selected from any one or more of fiber-reinforced prepreg, fiber fabric, and ordinary film.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] Example 1: According to the appendix Figure 2 As shown, the end cap in this embodiment 1 is a single-piece, ejectable circular flat plate end cap with a diameter of 800mm. It is a circular flat plate with a circumferential groove (this circumferential groove is a weak point, used to guide the number and shape of fragments when the end cap breaks; the thickness of the cap body at the weak point is less than the thickness of other areas of the cap body, and the end cap breaks and is ejected along the weak point). In this embodiment, the three end caps with different functions are all manufactured using the same mold and spray painting production line. The specific manufacturing parameters and performance are as follows: Telemetry wave-transmitting end cap: The first functional layer 2 is a 0.1 mm thick glass fiber epoxy prepreg (this prepreg is prepared by wet impregnation process of alkali-free glass fiber cloth and 7901 epoxy resin at a mass ratio of 64:36); the main body 1 of the cap is a 3 mm glass fiber epoxy prepreg (produced by Weihai Guangwei Composite Materials Co., Ltd., 16 layers of 0° / 90° alternating) layup; the second functional layer 3 is a 0.1 mm thick glass fiber epoxy prepreg, and 0.1 mm epoxy film (7901 epoxy resin) is used in the grooves; 1, 2 and 3 are formed by hot pressing; the three-proof coating 4 is acrylic polyurethane sea gray enamel paint, which is sprayed by air.

[0041] Electromagnetic shielding end cap A: The first functional layer 2 is 0.1 mm thick glass fiber epoxy prepreg; the main body 1 is 3 mm glass fiber epoxy prepreg layer; the second functional layer 3 is 0.1 mm thick aluminum foil, and the grooves are made of 0.1 mm epoxy conductive film; 1, 2 and 3 are formed by hot pressing; the three-proof coating 4 is acrylic polyurethane sea gray enamel paint, which is applied by air spraying.

[0042] Electromagnetic shielding end cap B: The first functional layer 2 is 0.1 mm aluminum foil; the main body 1 is 3 mm fiberglass epoxy prepreg; the second functional layer 3 is 0.1 mm thick aluminum foil, and the grooves are made of 0.1 mm epoxy conductive film; 1, 2 and 3 are formed by hot pressing; the three-proof coating 4 is acrylic polyurethane sea gray enamel paint, which is applied by air spraying.

[0043] The opening pressures of the three are equivalent, at 0.086 MPa, 0.084 MPa, and 0.092 MPa respectively; the electromagnetic shielding performance of end cap A is -12 dB (10 GHz); and the electromagnetic shielding performance of end cap B is -25 dB (10 GHz).

[0044] Example 2: According to the appendix Figure 3 As shown, the end cap in this embodiment 2 is a six-piece ejector-type circular flat end cap with a diameter of 300 mm. It is provided with X-shaped grooves and circumferential grooves (used to guide the number and shape of fragments when the end cap breaks). In this embodiment, both types of end caps with different functions are manufactured using the same mold and spraying production line. The specific manufacturing parameters and performance are as follows: Telemetry wave-transmitting end cap: The first functional layer 2 is a 0.2 mm single sheet of glass fiber plain weave fabric; the main body 1 of the cap is a 2.5 mm glass fiber plain weave fabric layer (cut at the X groove); the second functional layer 3 is a 0.2 mm glass fiber plain weave fabric layer (cut at the X groove); 1, 2 and 3 are formed by vacuum-assisted epoxy resin infusion; the three-proof coating 4 is all acrylic polyurethane military green magnetic paint, applied by air spraying.

[0045] Electromagnetic shielding end cap: The first functional layer 2 is a 0.1 mm whole copper foil and a 0.1 mm glass fiber plain weave cloth; the main body 1 of the cap is a 2.5 mm glass fiber plain weave cloth layer (cut at the X groove); the second functional layer 3 is a 0.2 mm glass fiber plain weave cloth layer (cut at the X groove); 1, 2 and 3 are vacuum-assisted epoxy resin infusion molding; the three-proof coating 4 is all acrylic polyurethane military green magnetic paint, which is sprayed with air.

[0046] The two have comparable bursting forces, 1125 N and 1320 N respectively; the electromagnetic shielding performance of the electromagnetic shielding end cap is -15 dB (10 GHz).

[0047] 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 transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission, characterized in that, The cover body (1) includes a first functional layer (2) on one side surface and a second functional layer (3) on the opposite side surface. Both the first functional layer (2) and the second functional layer (3) are provided with a three-proof coating (4) on the side away from the cover body (1).

2. The transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 1, characterized in that, The first functional layer (2) and the second functional layer (3) are selected from any one or more of fiber-reinforced prepreg, metal foil, fiber fabric, ordinary adhesive film, and conductive adhesive film, and the cover body (1) is selected from any one or more of fiber-reinforced prepreg, fiber fabric, and foam material.

3. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 2, characterized in that, When the materials of the cover body (1), the first functional layer (2), and the second functional layer (3) are fiber fabrics, the fiber fabrics are selected from any one or more of carbon fiber and fabrics, glass fiber and fabrics, aramid fiber and fabrics, and ultra-high molecular weight polyethylene fiber and fabrics.

4. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 2, characterized in that, The metal foil is selected from one or more of aluminum, stainless steel, copper, zinc, and nickel, and the foam material is selected from one or more of polyurethane foam, epoxy foam, and PMI foam.

5. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 1, characterized in that, The transmitter box end cover is either an electromagnetic shielding transmitter box end cover or a telemetry transmission transmitter box end cover. The end cover can achieve electromagnetic shielding function or telemetry transmission function by changing the material type of the first functional layer (2) and the second functional layer (3), and the thickness of the first functional layer (2) and the second functional layer (3) remains unchanged.

6. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 5, characterized in that, When the transmitter box end cover is an electromagnetic shielding transmitter box end cover and the electromagnetic shielding effectiveness is <20dB, at least one of the first functional layer (2) and the second functional layer (3) is selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

7. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 5, characterized in that, When the transmitter box end cover is an electromagnetic shielding transmitter box end cover and the electromagnetic shielding effectiveness is ≥20dB, the first functional layer (2) and the second functional layer (3) are each independently selected from any one of metal foil, conductive film, and composite material of metal foil and conductive film.

8. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 1, characterized in that, When the transmitter box end cover is a remote sensing wave transmission function transmitter box end cover, the first functional layer (2) and the second functional layer (3) are each independently selected from any one or more of fiber-reinforced prepreg, fiber fabric, and ordinary film.

9. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 1, characterized in that, The cover body (1), the first functional layer (2), and the second functional layer (3) are integrally formed, and the forming method is selected from any one of hand lay-up molding, press hot pressing molding, autoclave molding, mold forming, and vacuum-assisted molding.

10. A transmitter box end cover capable of electromagnetic shielding or telemetry wave transmission according to claim 1, characterized in that, The three-proof coating (4) is prepared by one or more of the brushing or air spraying processes.

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