Shielding cover for cabin and preparation process thereof

Abstract

The invention discloses a shielding cover for a cabin in the technical field, the shielding cover comprises a bearing assembly and a wave absorbing assembly, the wave absorbing assembly comprises a flame-retardant wave-absorbing honeycomb laminated plate, a lower skin and an upper skin, and the preparation process of the shielding cover for the cabin comprises the following steps: S1, preparing raw materials; s2, preparing a mold; s3, blanking of the flame-retardant medium-temperature epoxy prepreg; s4, paving and manufacturing a skin; s5, manufacturing a vacuum bag; s6, curing in a tank; s7, curing post-treatment is carried out; s8, adhesive film paving and pasting; s9, laying a flame-retardant wave-absorbing honeycomb laminated plate; s10, paving the skin; s11, manufacturing a vacuum bag; s12, curing in a tank; s13, machining cutting is conducted; the wave-absorbing and flame-retardant shielding cover has good wave-absorbing performance and flame-retardant performance, meanwhile, compared with a steel structure shielding cover and a skin which are made of epoxy resin, the corrosion resistance is high, and the maintenance cost is reduced; the wave absorbing assembly can absorb electromagnetic waves, prevents equipment from being interfered by electromagnetic interference, and has good corrosion resistance and flame retardant performance.

Description

Technical Field

[0001] The invention relates to the technical field of hull application, and in particular to a shielding cover for a cabin and a preparation process thereof. Background Art

[0002] As the main shielding material for equipment outside the cabin, shielding covers are widely used in various ships. With the increasing requirements for shielding covers on ships, such as flame retardancy, stealth, and light weight, the advantages of composite materials such as high strength, low specific gravity, and designability are highlighted. The number of shielding covers equipped on ships with composite materials as the main raw material has increased significantly.

[0003] In order to achieve the stealth requirement, most products on the market directly spray stealth coating materials on the products to absorb or greatly reduce the electromagnetic wave energy received on the surface, thereby reducing electromagnetic interference. Although this method can meet the requirements of stealth performance, the coating thickness cannot be too large, and it can only have good stealth performance in certain bands, but not in other bands. The coating itself has low strength and is easy to fall off. The coating is greatly affected by temperature and humidity, and the maintenance cost is high.

[0004] Most of the shielding covers used on ships are steel structure shielding covers, which only have the function of shielding equipment and cannot solve the problem that the equipment in the shielding cover is affected by electromagnetic interference and cannot work normally. The steel structure shielding cover has poor corrosion resistance in the marine environment and requires regular maintenance. In addition, the steel structure is heat-resistant but not fire-resistant and does not have good flame retardant properties.

[0005] The shielding cover is composed of a carrier and an absorbing part, and the absorbing part is bonded to the outside of the carrier. The flame retardant absorbing honeycomb sandwich laminate plays a pivotal role in the overall performance of the shielding cover. The quality of the flame retardant absorbing honeycomb sandwich laminate can directly affect the performance of the entire shielding cover, so the optimization of the design and molding of the flame retardant absorbing honeycomb sandwich laminate is conducive to improving the quality of the shielding cover product. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a cabin shielding cover and a preparation process thereof.

[0007] The object of the present invention is achieved as follows: A shielding cover for a cabin, comprising a bearing component and an absorbing component, wherein the absorbing component comprises a flame-retardant absorbing honeycomb laminate, a first medium-temperature epoxy structural adhesive film is fixedly provided at the lower part of the flame-retardant absorbing honeycomb laminate, a lower skin is fixedly provided at the lower part of the first medium-temperature epoxy structural adhesive film, a second medium-temperature epoxy structural adhesive film is fixedly provided at the upper part of the flame-retardant absorbing honeycomb laminate, an upper skin is fixedly provided at the upper part of the second medium-temperature epoxy structural adhesive film, a medium-temperature foaming glue is provided around the outer side of the flame-retardant absorbing honeycomb laminate, and an edge-sealing skin is provided around the outer side of the medium-temperature foaming glue; The bearing components are fixedly connected to the lower part of the absorbing component at equal intervals. The bearing components include structural adhesive and steel parts. The steel parts are fixedly adhered to the lower part of the lower skin by the structural adhesive.

[0008] Specifically, the lower skin, the upper skin and the edge-banding skin have the same structure, and each of the lower skin, the upper skin and the edge-banding skin includes a flame-retardant medium-temperature epoxy prepreg and an adhesive film, and the adhesive film is laid on the upper surface of the flame-retardant medium-temperature epoxy prepreg.

[0009] Specifically, the absorbing component is a three-layer structure consisting of the first medium-temperature epoxy structural adhesive film and the lower skin and the second medium-temperature epoxy structural adhesive film and the upper skin arranged on both sides of the flame-retardant absorbing honeycomb laminate, and the lower skin and the upper skin are made of a mixture of flame-retardant medium-temperature epoxy prepreg and flame retardant.

[0010] A process for preparing a shielding cover for a cabin, wherein the preparation of a wave absorbing component comprises the following steps: S1. Raw material preparation: Take out the flame-retardant medium-temperature epoxy prepreg stored in a -18°C cold storage in advance, and place the flame-retardant medium-temperature epoxy prepreg at room temperature for 6 hours; S2. Mould preparation: After the flat plate mould is inspected and qualified, clean the flat plate mould with acetone, and fix and install the vertical edge bar on the side of the flat plate mould; S3, flame retardant medium temperature epoxy prepreg cutting: the CPD module of Catia software is used to make the cutting drawings of the lower skin and the upper skin, and the flame retardant medium temperature epoxy prepreg is cut by the cutting machine, and the flame retardant medium temperature epoxy prepreg is cut to size according to the reference line on the cutting machine; S4. Laying and making skin: Lay the cut flame-retardant medium-temperature epoxy prepreg on the flat mold, and lay the edge of the flame-retardant medium-temperature epoxy prepreg 20 mm outside the product line of the flat mold; S5. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on the upper surface of the skin blank in sequence, and installing a vacuum nozzle at the position marked on the flat mold, and then sealing the vacuum bag, turning on the vacuum source for 10 minutes, evacuating the vacuum bag, and checking that the vacuum degree in the vacuum bag does not exceed 0.02MPa; S6, entering the tank for curing: transport the vacuum bag and the skin blank inside to the autoclave platform by hoisting, and install the thermocouple according to the position marked on the flat mold; S7, post-curing treatment: take out the cured skin blank, first disassemble the vacuum bag, and then remove the peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film; S8, film laying: the first medium-temperature epoxy structural film and the second medium-temperature epoxy structural film are evenly laid on the upper surface of the lower skin and the upper skin. When the films are overlapped, the overlap seam is less than 5mm. After the laying of the first medium-temperature epoxy structural film and the second medium-temperature epoxy structural film is completed, pre-evacuation is performed through a vacuum bag. The pre-evacuation time is greater than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085MPa. S9. Laying out the flame-retardant and wave-absorbing honeycomb laminate: cut the flame-retardant and wave-absorbing honeycomb laminate according to the size of the product, then use a vacuum cleaner to suck out the impurities in the flame-retardant and wave-absorbing honeycomb laminate, then use anhydrous ethanol to clean the flame-retardant and wave-absorbing honeycomb laminate, and then put the flame-retardant and wave-absorbing honeycomb laminate into a 75°C oven, keep it warm for 2 hours, and remove the water vapor in the flame-retardant and wave-absorbing honeycomb laminate; after the flame-retardant and wave-absorbing honeycomb laminate is placed, vacuum bags are pre-pumped, and the overlapped places of the honeycombs are filled with medium-temperature foam glue; S10, skin laying: evenly lay the lower skin (3) and the upper skin (5) adhered with the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) on the two surfaces of the flame-retardant and wave-absorbing honeycomb laminate (1), and after the laying of the lower skin (3) and the upper skin (5) is completed, the vacuum bag is pre-evacuated, and the pre-evacuation time is less than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085MPa; S11. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on both surfaces of the blank of the absorbing component in sequence, placing a vacuum nozzle at the position marked on the flat mold, sealing the vacuum bag, starting the vacuum source for 10 minutes to extract the vacuum, and detecting that the vacuum degree does not exceed 0.02MPa; S12, entering the tank for curing: transport the vacuum bag and the blank of the absorbing component inside to the autoclave platform by hoisting, install the thermocouple according to the position marked on the flat mold, use the medium-temperature sealing strip to seal the thermocouple along the edge of the sealing strip of the vacuum bag, and cover the excess vacuum bag film on the medium-temperature sealing strip and fix it at the position of the sealing strip, then lay two layers of breathable felt on the medium-temperature vacuum bag film on the upper part of the thermocouple, and fix it with a demoulding cloth strip; S13, machine cutting: demoulding after curing is completed, manual cutting or automatic mechanical cutting is performed to ensure that the absorbing component reaches the required design dimensions.

[0011] Specifically, the flat mold in S2 is first cleaned repeatedly with acetone for 3 times, and then dried and degreased in an oven. After degreasing, the flat mold is roughened with sandpaper in the sealing tape area, and the position is set to 2-3 cm inside the edge of the flat mold, around the flat mold, and cleaned with acetone.

[0012] Specifically, the thermocouple in S6 is sealed and pasted along the edge of the sealing strip of the vacuum bag using a medium-temperature sealing strip, and the pasting position of the sealing strip is the roughened area with sandpaper, and the excess vacuum bag film is covered on the medium-temperature sealing strip and fixed at the position of the sealing strip, and then two layers of breathable felt are laid on the medium-temperature vacuum bag film on the upper part of the thermocouple and fixed with a demolding cloth strip.

[0013] Specifically, the joint seams of each layer of the flame-retardant and wave-absorbing honeycomb laminate, the first medium-temperature epoxy structural adhesive film, the second medium-temperature epoxy structural adhesive film, the lower skin and the upper skin need to be staggered, and the staggered distance is at least 100 mm.

[0014] Specifically, the edges of the flame retardant and wave absorbing honeycomb laminated panels after manual cutting or automatic mechanical cutting in S13 are sealed by using medium-temperature foaming adhesive.

[0015] Specifically, the steps of bonding the absorbing component to the bearing component are as follows: Positioning: Use release cloth to locate the area where the absorbing component is bonded to the load-bearing component; Glue adjustment: According to the process specifications, use an electronic scale to accurately weigh the theoretical amount of glue and record the weight of component A and component B of the structural adhesive; Gluing: Use a scraper to evenly apply a layer of structural adhesive on the bonding area of ​​the absorbing component and the load-bearing component to adhere the absorbing component to the load-bearing component.

[0016] Specifically, the adhesion between the absorbing component and the bearing component is carried out by applying uniform pressure by vacuuming: Make a vacuum bag: Use vacuuming to apply uniform pressure to the absorbing component so that the absorbing component and the load-bearing component are tightly bonded. First, putty strips are placed on the protective demoulding cloth, and then the putty strips are applied to the load-bearing structure to fix the isolation film on the absorbing component. Then, the breathable felt and vacuum bag film are placed. Vacuum and test the vacuum degree and the vacuum degree after 5 minutes. If the pressure drop does not exceed 0.008Mpa after 5 minutes, the vacuum bag is good. If the pressure drop exceeds 0.008Mpa after 5 minutes, check the air tightness of the vacuum bag again. Adjust the position of the absorbing component to prevent position displacement due to vacuuming. Curing: The lightweight composite shield is cured at room temperature for 24 hours; Cleaning: After the structural adhesive solidifies, remove the vacuum device, including putty strips, isolation membranes, breathable felt, vacuum bag membranes, and release cloths; after cleaning, carefully check for any residues; clean residual glue, check for deficiencies and fill in gaps, and fill in gaps with glue again.

[0017] Compared with the prior art, the present invention has the following beneficial effects: Compared with a single steel structure shielding cover, the present invention has superior performance, has good wave absorbing performance and flame retardant performance. At the same time, compared with the steel structure shielding cover, the skin material uses epoxy resin, has higher corrosion resistance, and reduces maintenance costs. The shielding cover is divided into an absorbing component and a load-bearing component. The absorbing component is a flame-retardant absorbing honeycomb laminate. The lower skin and the upper skin are formed separately, and then the flame-retardant absorbing honeycomb laminate, the upper skin and the lower skin are formed together. The autoclave curing molding process is used, and the absorbing component and the load-bearing component are bonded with structural adhesive. The absorbing honeycomb makes the product have good absorbing performance, and flame retardant is added to the skin prepreg resin to make the product have flame retardant properties; the absorbing component can absorb electromagnetic waves to prevent the equipment from being affected by electromagnetic interference, and has good corrosion resistance and flame retardant properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 It is a side structural schematic diagram of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic diagram of the steps of the present invention.

[0020] In the figure, 1. flame retardant and wave absorbing honeycomb laminate; 2. first medium temperature epoxy structural adhesive film; 3. lower skin; 4. second medium temperature epoxy structural adhesive film; 5. upper skin; 6. medium temperature foaming adhesive; 7. edge sealing skin; 8. structural adhesive; 9. steel parts. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] like Figure 1-3A shielding cover for a cabin is shown, comprising a bearing component and an absorbing component, wherein the absorbing component comprises a flame-retardant absorbing honeycomb laminate 1, a first medium-temperature epoxy structural adhesive film 2 is fixedly provided at the lower part of the flame-retardant absorbing honeycomb laminate 1, a lower skin 3 is fixedly provided at the lower part of the first medium-temperature epoxy structural adhesive film 2, a second medium-temperature epoxy structural adhesive film 4 is fixedly provided at the upper part of the flame-retardant absorbing honeycomb laminate 1, an upper skin 5 is fixedly provided at the upper part of the second medium-temperature epoxy structural adhesive film 4, a medium-temperature foaming glue 6 is provided around the outer side of the flame-retardant absorbing honeycomb laminate 1, and an edge-sealing skin 7 is provided around the outer side of the medium-temperature foaming glue 6; The bearing components are fixedly connected to the lower part of the absorbing component at equal intervals. The bearing components include structural adhesive 8 and steel members 9. The steel members 9 are fixedly bonded to the lower part of the lower skin 3 by the structural adhesive 8.

[0023] In this embodiment, preferably, the lower skin 3, the upper skin 5 and the edge-sealed skin 7 have the same structure, and the lower skin 3, the upper skin 5 and the edge-sealed skin 7 all include flame-retardant medium-temperature epoxy prepreg and adhesive film, and the adhesive film is laid on the upper surface of the flame-retardant medium-temperature epoxy prepreg; It should be noted that the flame retardant medium temperature epoxy prepreg has good corrosion resistance and flame retardancy, and the adhesive film is used to improve adhesion, so as to facilitate adhesion between the flame retardant medium temperature epoxy prepreg and the flame retardant absorbing honeycomb laminate 1 .

[0024] In this embodiment, preferably, the absorbing component is a three-layer structure consisting of a first medium-temperature epoxy structural adhesive film 2 and a lower skin 3 and a second medium-temperature epoxy structural adhesive film 4 and an upper skin 5, and the lower skin 3 and the upper skin 5 are arranged on both sides of the flame-retardant absorbing honeycomb laminate 1. The lower skin 3 and the upper skin 5 are made of a mixture of flame-retardant medium-temperature epoxy prepreg and a flame retardant; It should be noted that the three-layer structure of the absorbing component can effectively absorb electromagnetic waves to prevent the equipment from being interfered with by electromagnetic waves, and the flame retardant can improve the flame retardant effect.

[0025] refer to Figure 4 , a process for preparing a shielding cover for a cabin, the preparation of the wave absorbing component comprises the following steps: S1. Raw material preparation: Take out the flame-retardant medium-temperature epoxy prepreg stored in a -18°C cold storage in advance, and place the flame-retardant medium-temperature epoxy prepreg at room temperature for 6 hours; S2. Mould preparation: After the flat plate mould is inspected and qualified, clean the flat plate mould with acetone, and fix and install the vertical edge bar on the side of the flat plate mould; S3, flame retardant medium temperature epoxy prepreg cutting: the cutting drawings of the lower skin 3 and the upper skin 5 are made by the CPD module of the Catia software, and the flame retardant medium temperature epoxy prepreg is cut by a cutting machine, and the flame retardant medium temperature epoxy prepreg is cut to size according to the reference line on the cutting machine; S4. Laying and making skin: Lay the cut flame-retardant medium-temperature epoxy prepreg on the flat mold, and lay the edge of the flame-retardant medium-temperature epoxy prepreg 20 mm outside the product line of the flat mold; S5. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on the upper surface of the skin blank in sequence, and installing a vacuum nozzle at the position marked on the flat mold, and then sealing the vacuum bag, turning on the vacuum source for 10 minutes, evacuating the vacuum bag, and checking that the vacuum degree in the vacuum bag does not exceed 0.02MPa; S6, entering the tank for curing: transport the vacuum bag and the skin blank inside to the autoclave platform by hoisting, and install the thermocouple according to the position marked on the flat mold; S7, post-curing treatment: take out the cured skin blank, first disassemble the vacuum bag, and then remove the peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film; S8, film paving: the first medium-temperature epoxy structural adhesive film 2 and the second medium-temperature epoxy structural adhesive film 4 are evenly paved on the upper surfaces of the lower skin 3 and the upper skin 5. When the adhesive films are overlapped, the overlap seam is less than 5 mm. After the paving of the first medium-temperature epoxy structural adhesive film 2 and the second medium-temperature epoxy structural adhesive film 4 is completed, a vacuum bag is used for pre-evacuation. The pre-evacuation time is greater than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085 MPa. S9, laying out the flame-retardant absorbing honeycomb laminate 1: cutting the flame-retardant absorbing honeycomb laminate 1 according to the size of the product, then using a vacuum cleaner to suck out the impurities in the flame-retardant absorbing honeycomb laminate 1, and then using anhydrous ethanol to clean the flame-retardant absorbing honeycomb laminate 1, and then putting the flame-retardant absorbing honeycomb laminate 1 into a 75° C. oven, keeping it warm for 2 hours, and removing the water vapor in the flame-retardant absorbing honeycomb laminate 1; after the flame-retardant absorbing honeycomb laminate 1 is placed, the vacuum bag is pre-empted, and the overlapped places of the honeycombs are filled with medium-temperature foam glue 6; S10, skin laying: evenly lay the lower skin (3) and the upper skin (5) adhered with the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) on the two surfaces of the flame-retardant and wave-absorbing honeycomb laminate (1), and after the laying of the lower skin (3) and the upper skin (5) is completed, the vacuum bag is pre-evacuated, and the pre-evacuation time is less than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085MPa; S11. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on both surfaces of the blank of the absorbing component in sequence, placing a vacuum nozzle at the position marked on the flat mold, sealing the vacuum bag, starting the vacuum source for 10 minutes to extract the vacuum, and detecting that the vacuum degree does not exceed 0.02MPa; S12, entering the tank for curing: transport the vacuum bag and the blank of the absorbing component inside to the autoclave platform by hoisting, install the thermocouple according to the position marked on the flat mold, use the medium-temperature sealing strip to seal the thermocouple along the edge of the sealing strip of the vacuum bag, and cover the excess vacuum bag film on the medium-temperature sealing strip and fix it at the position of the sealing strip, then lay two layers of breathable felt on the medium-temperature vacuum bag film on the upper part of the thermocouple, and fix it with a demoulding cloth strip; S13, machine cutting: demoulding after curing is completed, manual cutting or automatic mechanical cutting is performed to ensure that the absorbing component reaches the required design dimensions.

[0026] In this embodiment, preferably, the flat mold in S2 is first repeatedly cleaned with acetone for 3 times, and then dried and degreased in an oven. After degreasing, the flat mold is roughened with sandpaper in the sealing tape area, and the position is set to 2-3 cm inside the edge of the flat mold, around the flat mold, and cleaned with acetone; It should be noted that repeated cleaning with acetone three times allows the flat plate mold to be cleaned without small particles, ensuring the surface quality of the product, and rough grinding with sandpaper facilitates the subsequent adhesion strength of the sealing strip.

[0027] In this embodiment, preferably, the thermocouple in S6 is sealed and pasted along the edge of the sealing strip of the vacuum bag using a medium-temperature sealing strip, and the pasting position of the sealing strip is the roughened area polished by sandpaper, and the excess vacuum bag film is covered on the medium-temperature sealing strip and fixed at the position of the sealing strip, and then two layers of breathable felt are laid on the medium-temperature vacuum bag film on the upper part of the thermocouple and fixed with a demoulding cloth strip; It should be noted that the thermocouple is sealed and pasted along the edge of the sealing strip of the sealing bag with a medium-temperature sealing strip, and the excess packaging vacuum bag film is covered on it to fix the position of the sealing strip to prevent the sealing strip from being heated and the thermocouple from shifting; then, 2 layers of breathable felt are laid on the medium-temperature bag film on the top of the thermocouple and fixed with a demoulding cloth strip; the sealing strip covering the thermocouple is prevented from coming into contact with the air after the medium temperature, and the air temperature interferes with the thermocouple detection.

[0028] In this embodiment, preferably, the joint gaps of the flame retardant and wave absorbing honeycomb laminate 1, the first medium temperature epoxy structural adhesive film 2, the second medium temperature epoxy structural adhesive film 4, the lower skin 3 and the upper skin 5 need to be staggered for each layer, and the staggered distance is at least 100 mm; It should be noted that the joint seams of the flame retardant and absorbing honeycomb laminate 1, the first medium-temperature epoxy structural film 2, the second medium-temperature epoxy structural film 4, the lower skin 3 and the upper skin 5 are staggered to facilitate improving the bonding strength of the flame retardant and absorbing honeycomb laminate 1, the first medium-temperature epoxy structural film 2, the second medium-temperature epoxy structural film 4, the lower skin 3 and the upper skin 5, and preventing the flame retardant and absorbing honeycomb laminate 1, the first medium-temperature epoxy structural film 2, the second medium-temperature epoxy structural film 4, the lower skin 3 and the upper skin 5 from breaking at the bonding position.

[0029] In this embodiment, preferably, the edges of the flame retardant and wave absorbing honeycomb laminate 1 after manual cutting or mechanical automatic cutting in S13 are sealed, and the edges of the flame retardant and wave absorbing honeycomb laminate 1 are sealed with medium-temperature foam glue 6; It should be noted that the setting of the medium-temperature foaming glue 6 facilitates improving the sealing property of the edge of the flame-retardant and wave-absorbing honeycomb laminate 1 and preventing glue liquid contamination.

[0030] In this embodiment, preferably, the bonding steps of the absorbing component to the bearing component are as follows: Positioning: Use release cloth to locate the area where the absorbing component is bonded to the load-bearing component; Glue adjustment: According to the process specifications, use an electronic scale to accurately weigh the theoretical amount of glue, and record the weight of component A and component B of structural adhesive 8; Gluing: Use a scraper to evenly apply a layer of structural glue 8 on the bonding area of ​​the absorbing component and the load-bearing component to adhere the absorbing component to the load-bearing component; It should be noted that the absorbing component is adhered to the bearing component by means of the structural adhesive 8, so as to improve the adhesion strength and facilitate the installation and connection of the absorbing component.

[0031] In this embodiment, preferably, the adhesion of the absorbing component and the bearing component is achieved by applying uniform pressure by vacuuming: Make a vacuum bag: Use vacuuming to apply uniform pressure to the absorbing component so that the absorbing component and the load-bearing component are tightly bonded. First, putty strips are placed on the protective demoulding cloth, and then the putty strips are applied to the load-bearing structure to fix the isolation film on the absorbing component. Then, the breathable felt and vacuum bag film are placed. Vacuum and test the vacuum degree and the vacuum degree after 5 minutes. If the pressure drop does not exceed 0.008Mpa after 5 minutes, the vacuum bag is good. If the pressure drop exceeds 0.008Mpa after 5 minutes, check the air tightness of the vacuum bag again. Adjust the position of the absorbing component to prevent position displacement due to vacuuming. Curing: The lightweight composite shield is cured at room temperature for 24 hours; Cleaning: After the structural adhesive 8 is cured, remove the vacuum device, including putty strips, isolation film, breathable felt, vacuum bag film, and demoulding cloth; after cleaning, carefully check for residues; clean the residual glue, check for gaps and fill them, and fill the gaps with glue again; It should be noted that uniform pressure is applied to the absorbing component and the bearing component by using a vacuum bag, so as to improve the adhesion strength between the absorbing component and the bearing component.

[0032] The specific operation process of the present invention is as follows: Step 1: Raw material preparation: Take out the flame-retardant medium-temperature epoxy prepreg stored in a -18°C cold storage in advance, and place the flame-retardant medium-temperature epoxy prepreg at room temperature for 6 hours; Step 2, mold preparation: After the flat mold is inspected and qualified, use acetone to clean the flat mold, and fix the vertical edge bar on the side of the flat mold. The flat mold is first cleaned with acetone for 3 times, and then dried and degreased in an oven. After degreasing, the flat mold is roughened with sandpaper in the sealing tape area, and the position is set to 2-3 cm inside the edge of the flat mold, around the flat mold, and cleaned with acetone; Step 3: Cutting flame retardant medium temperature epoxy prepreg: Make the cutting drawings of the lower skin 3 and the upper skin 5 through the CPD module of Catia software, and cut the flame retardant medium temperature epoxy prepreg with the help of a cutting machine, and cut the flame retardant medium temperature epoxy prepreg to size according to the reference line on the cutting machine; Step 4: Lay out and make the skin: Lay the cut flame-retardant medium-temperature epoxy prepreg on the flat mold, and lay the edge of the flame-retardant medium-temperature epoxy prepreg 20 mm outside the product line of the flat mold; Step 5: Make a vacuum bag: Place a peelable cloth, a medium-temperature non-porous isolation film, a medium-temperature breathable felt, and a medium-temperature vacuum bag film on the upper surface of the skin blank in sequence, and install a vacuum nozzle at the position marked on the flat mold, then seal the vacuum bag, turn on the vacuum source for 10 minutes, evacuate the vacuum bag, and check that the vacuum degree in the vacuum bag does not exceed 0.02MPa; Step 6, curing in the tank: transport the vacuum bag and the skin blank inside to the autoclave platform by hoisting, install the thermocouple according to the position marked on the flat mold, and seal the thermocouple along the edge of the vacuum bag's sealing strip with a medium-temperature sealing strip, and the pasting position of the sealing strip is the roughened area polished by sandpaper, and cover the excess vacuum bag film on the medium-temperature sealing strip and fix it at the position of the sealing strip, and then lay two layers of breathable felt on the medium-temperature vacuum bag film on the upper part of the thermocouple, and fix it with a demoulding cloth strip; Step 7, post-curing treatment: take out the cured skin blank, first disassemble the vacuum bag, and then remove the peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film; Step 8, film paving: the first medium-temperature epoxy structural adhesive film 2 and the second medium-temperature epoxy structural adhesive film 4 are evenly paved on the upper surfaces of the lower skin 3 and the upper skin 5. When the adhesive films are overlapped, the overlap seam is less than 5 mm. After the paving of the first medium-temperature epoxy structural adhesive film 2 and the second medium-temperature epoxy structural adhesive film 4 is completed, a vacuum bag is used for pre-evacuation. The pre-evacuation time is greater than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085 MPa. Step 9, laying the flame retardant absorbing honeycomb laminate 1: cut the flame retardant absorbing honeycomb laminate 1 according to the size of the product, then use a vacuum cleaner to suck away the impurities in the flame retardant absorbing honeycomb laminate 1, and then use anhydrous ethanol to clean the flame retardant absorbing honeycomb laminate 1, and then put the flame retardant absorbing honeycomb laminate 1 into a 75°C oven, keep it warm for 2 hours, and remove the water vapor in the flame retardant absorbing honeycomb laminate 1; after the flame retardant absorbing honeycomb laminate 1 is placed, the vacuum bag is pre-pumped, and the overlapped places of the honeycombs are filled with medium-temperature foam glue 6; Step 10, skin laying: evenly lay the lower skin (3) and the upper skin (5) adhered with the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) on the two surfaces of the flame-retardant and wave-absorbing honeycomb laminate (1). After the laying of the lower skin (3) and the upper skin (5) is completed, the vacuum bag is pre-evacuated. The pre-evacuation time is less than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085MPa. Step 11, making a vacuum bag: placing a peelable cloth, a medium-temperature non-porous isolation film, a medium-temperature breathable felt, and a medium-temperature vacuum bag film on both surfaces of the blank of the absorbing component in sequence, placing a vacuum nozzle at the position marked on the flat mold, sealing the vacuum bag, starting the vacuum source for 10 minutes to extract the vacuum, and detecting that the vacuum degree does not exceed 0.02MPa; Step 12: Curing in the tank: transport the vacuum bag and the blank of the absorbing component inside to the autoclave platform by hoisting, install the thermocouple according to the position marked on the flat mold, use the medium-temperature sealing strip to seal the thermocouple along the edge of the sealing strip of the vacuum bag, and cover the excess vacuum bag film on the medium-temperature sealing strip and fix it at the position of the sealing strip, then lay two layers of breathable felt on the medium-temperature vacuum bag film on the upper part of the thermocouple, and fix it with a demoulding cloth strip; Step 13, machine cutting: demoulding after curing is completed, manual cutting or automatic mechanical cutting is performed to ensure that the absorbing component reaches the required design dimensions, and the edges of the flame-retardant absorbing honeycomb laminate 1 after manual cutting or automatic mechanical cutting are sealed, and the edges of the flame-retardant absorbing honeycomb laminate 1 are sealed with medium-temperature foaming glue 6; Step 14: The steps for bonding the absorbing component to the carrier component are as follows: Positioning: Use release cloth to locate the area where the absorbing component is bonded to the load-bearing component; Glue adjustment: According to the process specifications, use an electronic scale to accurately weigh the theoretical amount of glue, and record the weight of component A and component B of structural adhesive 8; Gluing: Use a scraper to evenly apply a layer of structural glue 8 on the bonding area of ​​the absorbing component and the load-bearing component to adhere the absorbing component to the load-bearing component; It should be noted that the absorbing component is adhered to the bearing component by the structural adhesive 8 to improve the adhesion strength and facilitate the installation and connection of the absorbing component; Step 15: Apply uniform pressure to the absorbing component and the load-bearing component by vacuuming: Make a vacuum bag: Use vacuuming to apply uniform pressure to the absorbing component so that the absorbing component and the load-bearing component are tightly bonded. First, putty strips are placed on the protective demoulding cloth, and then the putty strips are applied to the load-bearing structure to fix the isolation film on the absorbing component. Then, the breathable felt and vacuum bag film are placed. Vacuum and test the vacuum degree and the vacuum degree after 5 minutes. If the pressure drop does not exceed 0.008Mpa after 5 minutes, the vacuum bag is good. If the pressure drop exceeds 0.008Mpa after 5 minutes, check the air tightness of the vacuum bag again. Adjust the position of the absorbing component to prevent position displacement due to vacuuming. Curing: The lightweight composite shield is cured at room temperature for 24 hours; Cleaning: After the structural adhesive 8 is cured, remove the vacuum device, including putty strips, isolation membranes, breathable felt, vacuum bag membranes, and demoulding cloths; after cleaning, carefully check for any residues; clean the residual glue, check for any gaps, and fill any gaps with glue again.

[0033] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cabin shield, characterized in that: It comprises a bearing component and an absorbing component, wherein the absorbing component comprises a flame-retardant absorbing honeycomb laminate (1), a first medium-temperature epoxy structural adhesive film (2) is fixedly provided at the lower part of the flame-retardant absorbing honeycomb laminate (1), a lower skin (3) is fixedly provided at the lower part of the first medium-temperature epoxy structural adhesive film (2), a second medium-temperature epoxy structural adhesive film (4) is fixedly provided at the upper part of the flame-retardant absorbing honeycomb laminate (1), an upper skin (5) is fixedly provided at the upper part of the second medium-temperature epoxy structural adhesive film (4), a medium-temperature foaming glue (6) is provided around the outer side of the flame-retardant absorbing honeycomb laminate (1), and an edge-sealing skin (7) is provided around the outer side of the medium-temperature foaming glue (6); The bearing components are fixedly connected to the lower part of the absorbing component at equal intervals, and the bearing components include structural adhesive (8) and a steel profile (9), and the steel profile (9) is fixedly bonded to the lower part of the lower skin (3) by the structural adhesive (8).

2. A cabin shielding cover according to claim 1, characterized in that: The lower skin (3), the upper skin (5) and the edge-sealed skin (7) have the same structure, and the lower skin (3), the upper skin (5) and the edge-sealed skin (7) all include flame-retardant medium-temperature epoxy prepreg and an adhesive film, and the adhesive film is laid on the upper surface of the flame-retardant medium-temperature epoxy prepreg.

3. A cabin shielding cover according to claim 1, characterized in that: The absorbing component is a three-layer structure consisting of the first medium-temperature epoxy structural adhesive film (2) and the lower skin (3) and the second medium-temperature epoxy structural adhesive film (4) and the upper skin (5) arranged on both sides of the flame-retardant absorbing honeycomb laminate (1), and the lower skin (3) and the upper skin (5) are made of a mixture of flame-retardant medium-temperature epoxy prepreg and flame retardant.

4. A process for preparing a cabin shield, used to prepare the structure of claims 1-3; characterized in that: The preparation of the absorbing component includes the following steps: S1. Raw material preparation: Take out the flame-retardant medium-temperature epoxy prepreg stored in a -18°C cold storage in advance, and place the flame-retardant medium-temperature epoxy prepreg at room temperature for 6 hours; S2. Mould preparation: After the flat plate mould is inspected and qualified, clean the flat plate mould with acetone, and fix and install the vertical edge bar on the side of the flat plate mould; S3, cutting of flame retardant medium temperature epoxy prepreg: using the CPD module of Catia software to make cutting drawings of the lower skin (3) and the upper skin (5), cutting the flame retardant medium temperature epoxy prepreg with the aid of a cutting machine, and cutting the flame retardant medium temperature epoxy prepreg to size according to the reference line on the cutting machine; S4. Laying and making skin: Lay the cut flame-retardant medium-temperature epoxy prepreg on the flat mold, and lay the edge of the flame-retardant medium-temperature epoxy prepreg 20 mm outside the product line of the flat mold; S5. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on the upper surface of the skin blank in sequence, and installing a vacuum nozzle at the position marked on the flat mold, and then sealing the vacuum bag, turning on the vacuum source for 10 minutes, evacuating the vacuum bag, and checking that the vacuum degree in the vacuum bag does not exceed 0.02MPa; S6, entering the tank for curing: transport the vacuum bag and the skin blank inside to the autoclave platform by hoisting, and install the thermocouple according to the position marked on the flat mold; S7, post-curing treatment: take out the cured skin blank, first disassemble the vacuum bag, and then remove the peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film; S8, adhesive film paving: the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) are evenly paved on the upper surface of the lower skin (3) and the upper skin (5), and the lap joint of the adhesive film is less than 5 mm. After the paving of the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) is completed, a vacuum bag is used for pre-evacuation, and the pre-evacuation time is greater than 15 minutes. The pre-evacuation time starts when the vacuum degree in the vacuum bag is lower than -0.085 MPa; S9. Laying out the flame-retardant and microwave-absorbing honeycomb laminate (1): cutting the flame-retardant and microwave-absorbing honeycomb laminate (1) according to the size of the product, then using a vacuum cleaner to remove impurities in the flame-retardant and microwave-absorbing honeycomb laminate (1), and then using anhydrous ethanol to clean the flame-retardant and microwave-absorbing honeycomb laminate (1), and then putting the flame-retardant and microwave-absorbing honeycomb laminate (1) into a 75° C. oven and keeping it warm for 2 hours to remove the water vapor in the flame-retardant and microwave-absorbing honeycomb laminate (1); after the flame-retardant and microwave-absorbing honeycomb laminate (1) is placed, the vacuum bag is pre-empted, and the overlapping places of the honeycombs are filled with medium-temperature foam glue (6); S10, skin laying: evenly lay the lower skin (3) and the upper skin (5) adhered with the first medium-temperature epoxy structural adhesive film (2) and the second medium-temperature epoxy structural adhesive film (4) on the two surfaces of the flame-retardant and wave-absorbing honeycomb laminate (1), and after the laying of the lower skin (3) and the upper skin (5) is completed, the vacuum bag is pre-evacuated, and the pre-evacuation time is less than 15 minutes. The pre-evacuation timing starts when the vacuum degree in the vacuum bag is lower than -0.085MPa; S11. Making vacuum bags: placing peelable cloth, medium-temperature non-porous isolation film, medium-temperature breathable felt, and medium-temperature vacuum bag film on both surfaces of the blank of the absorbing component in sequence, placing a vacuum nozzle at the position marked on the flat mold, sealing the vacuum bag, starting the vacuum source for 10 minutes to extract the vacuum, and detecting that the vacuum degree does not exceed 0.02MPa; S12, entering the tank for curing: transport the vacuum bag and the blank of the absorbing component inside to the autoclave platform by hoisting, install the thermocouple according to the position marked on the flat mold, use the medium-temperature sealing strip to seal the thermocouple along the edge of the sealing strip of the vacuum bag, and cover the excess vacuum bag film on the medium-temperature sealing strip and fix it at the position of the sealing strip, then lay two layers of breathable felt on the medium-temperature vacuum bag film on the upper part of the thermocouple, and fix it with a demoulding cloth strip; S13, machine cutting: demoulding after curing is completed, manual cutting or automatic mechanical cutting is performed to ensure that the absorbing component reaches the required design dimensions.

5. The process for preparing a cabin shielding cover according to claim 4, characterized in that: The flat plate mold in S2 is first cleaned repeatedly with acetone for 3 times, and then dried and degreased in an oven. After degreasing, the flat plate mold is roughened with sandpaper in the sealing tape area, and the position is set to 2-3 cm inside the edge of the flat plate mold, around the four sides of the flat plate mold, and cleaned with acetone.

6. The process for preparing a cabin shielding cover according to claim 5, characterized in that: The thermocouple in S6 is sealed and pasted along the edge of the sealing strip of the vacuum bag using a medium-temperature sealing strip, and the pasting position of the sealing strip is the roughened area with sandpaper, and the excess vacuum bag film is covered on the medium-temperature sealing strip and fixed at the position of the sealing strip, and then two layers of breathable felt are laid on the medium-temperature vacuum bag film on the upper part of the thermocouple and fixed with a demoulding cloth strip.

7. The process for preparing a cabin shielding cover according to claim 4, characterized in that: The joint gaps of the flame-retardant and wave-absorbing honeycomb laminate (1), the first medium-temperature epoxy structural adhesive film (2), the second medium-temperature epoxy structural adhesive film (4), the lower skin (3) and the upper skin (5) are staggered at each layer, and the staggered distance is at least 100 mm.

8. The process for preparing a cabin shielding cover according to claim 4, characterized in that: The edges of the flame retardant and wave absorbing honeycomb laminate (1) after manual cutting or automatic mechanical cutting in S13 are sealed by using a medium-temperature foaming adhesive (6).

9. The process for preparing a cabin shielding cover according to claim 4, characterized in that: The steps of bonding the absorbing component to the bearing component are as follows: Positioning: Use release cloth to locate the area where the absorbing component is bonded to the load-bearing component; Glue adjustment: According to the process specifications, use an electronic scale to accurately weigh the theoretical amount of glue and record the weight of component A and component B of the structural glue (8); Gluing: Use a scraper to evenly apply a layer of structural glue (8) on the bonding area of ​​the absorbing component and the load-bearing component to adhere the absorbing component to the load-bearing component.

10. The process for preparing a cabin shielding cover according to claim 9, characterized in that: The adhesion between the absorbing component and the bearing component is carried out by applying uniform pressure by vacuuming: Vacuum bagging: Use vacuuming to apply uniform pressure to the absorbing component to make the absorbing component and the load-bearing component tightly bonded. First, putty strips are placed on the protective release cloth, and then the putty strips are placed on the load-bearing structural parts to fix the isolation film on the absorbing component, and then the breathable felt and vacuum bag film are placed; Evacuate the bag, check the vacuum degree, and the vacuum degree after 5 minutes; if the pressure drop does not exceed 0.008Mpa after 5 minutes, the vacuum bag is in good condition; if the pressure drop exceeds 0.008Mpa after 5 minutes, check the air tightness of the vacuum bag again; adjust the position of the absorbing component to prevent position deviation due to vacuuming; Curing: The lightweight composite shield is cured at room temperature for 24 hours; Cleaning: After the structural adhesive (8) has solidified, remove the vacuum device, including putty strips, isolation film, breathable felt, vacuum bag film, and release cloth; after cleaning, carefully check for any residues; clean the residual adhesive, check for any gaps, and fill any gaps with adhesive again.

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