A connecting structure of a helicopter platform deck and a manufacturing method thereof

Abstract

The application provides a connecting structure of a helicopter platform deck and a preparation method, the connecting structure comprises a composite deck and a metal insert, the metal insert is used for fixed connection of the composite deck and a framework, the composite deck is a composite sandwich structure formed by an upper skin, a core material and a lower skin, the metal insert is arranged in the core material layer of the composite deck and is integrally formed with the upper skin, the core material and the lower skin through resin vacuum pouring, the metal insert is embedded when being synchronously formed with the composite deck, mechanical connection between the composite deck and the framework is realized, the connecting strength is large, the structure weight is light, permanent deformation is small and corrosion is not prone to occur, while the connecting strength of the helicopter platform deck and the framework is ensured, the load requirement of the composite helicopter platform deck is met, through arrangement of a preset stepped hole on the insert, the problem of local stress concentration of a punching part during mechanical connection is avoided, and the stability of the connection is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of helicopter platform, in particular to a connecting structure of a helicopter platform deck and a preparation method thereof. BACKGROUND

[0002] In the prior art, the helicopter platform is mainly installed on an offshore engineering platform, a ship or a high-rise building for the take-off and landing of a helicopter for the transfer of personnel and materials. The connecting structure of the helicopter platform deck and the preparation method thereof are generally installed on the top of the offshore engineering platform or the ship, which greatly affects the center of gravity of the offshore engineering platform or the ship and affects the safety in use. Therefore, the connecting structure of the helicopter platform deck and the preparation method thereof are very sensitive to weight.

[0003] At present, the main connecting structure of the helicopter platform deck and the preparation method thereof are mainly steel structure and aluminum structure. The hollow structural section is made by welding, and then the formed section is laid on the staggered skeleton, and the deck (section) and the skeleton are connected together by mechanical means such as bolts. The cost of the steel structure is relatively low compared with the aluminum structure, but the weight is large and the corrosion resistance is poor. Especially in the marine environment, when the anti-corrosion paint is damaged, the corrosion rate of the steel structure will further increase, which seriously affects the service life and safety in use. The weight of the aluminum structure is lighter than that of the steel structure, and the corrosion resistance is better than that of the steel structure. However, the cost of the aluminum structure is much higher than that of the steel structure, and the high-temperature resistance is not good. When a fire occurs, the aluminum structure will soften and collapse as the temperature rises.

[0004] Under this circumstance, composite materials gradually become an ideal helicopter platform deck preparation material because of their light weight, corrosion resistance and good fire resistance. The helicopter platform deck is usually arranged on the offshore engineering platform or the ship through a metal skeleton. The connecting method of the composite helicopter platform deck and the skeleton in the prior art is adhesive connection or mechanical connection. The adhesive connection has large strength discreteness and is easily affected by temperature environment, and cannot be disassembled. The local stress of the composite material at the connection part is too large in mechanical connection, the joint weight is large, and the permanent deformation is large. SUMMARY

[0005] The problem solved by the present application is that the connecting method of the composite helicopter platform deck and the skeleton in the prior art is adhesive connection or mechanical connection. The adhesive connection has large strength discreteness and is easily affected by temperature environment, and cannot be disassembled. The local stress of the composite material at the connection part is too large in mechanical connection, the joint weight is large, and the permanent deformation is large.

[0006] To solve the above problems, the application discloses a connecting structure of a helicopter platform deck, which comprises a composite deck and a metal insert, the metal insert is used for fixed connection of the composite deck and a framework, the composite deck is a composite sandwich structure formed by an upper skin, a core material and a lower skin, the metal insert is arranged in the core material layer of the composite deck and integrally formed with the upper skin, the core material and the lower skin through resin vacuum pouring.

[0007] Through the integrally pouring forming of the metal insert and the composite deck, the metal insert is preset in the composite deck, which reduces the number of parts when the helicopter platform deck is connected with the framework, improves the assembly efficiency of the helicopter platform deck, integrally forms the metal insert and the composite deck through resin vacuum pouring to improve the connecting stability of the composite deck and the framework, in addition, when connected, the fastener is directly connected with the metal insert, which avoids the phenomenon of local stress concentration on the composite deck and improves the use safety and service life of the composite deck.

[0008] Further, a preset stepped hole is arranged on the metal insert, and a connecting bolt is connected with the framework through the preset stepped hole.

[0009] Through the preset stepped hole, the connecting bolt is all crimped on the metal insert when connected, which avoids the connecting bolt applying pressure on the upper skin, thereby avoiding the phenomenon of local stress concentration on the composite deck, meanwhile, the preset stepped hole allows the nut of the connecting bolt to be accommodated in the stepped groove of the preset stepped hole, avoids the nut protruding on the upper surface of the composite deck, ensures the flatness of the composite deck, and further, the metal insert is arranged inside the composite deck and has little contact with the external environment, effectively improves the corrosion resistance of the metal insert, avoids electrochemical corrosion, and prolongs the service life of the connecting structure.

[0010] Further, the height of the metal insert is the same as that of the core material.

[0011] Through the above arrangement, the upper surface of the metal insert directly supports the upper skin, and the lower surface of the metal insert directly supports the lower skin, which greatly improves the carrying capacity of the position of the metal insert and ensures the use performance of the composite deck.

[0012] Further, a weight reduction groove is arranged on the metal insert.

[0013] The density of the metal insert is much greater than that of the composite deck, so that the metal insert is prone to local deformation caused by excessive weight. The weight-reducing groove can significantly reduce the weight of the metal insert, thereby overcoming the defect of the heavy mechanical connection joint in the prior art. Meanwhile, the weight-reducing groove increases the contact area between the metal insert and the core material, which helps to improve the bonding force between the metal insert and the core material, avoids relative displacement of the metal insert under load, and ensures the stability of the helicopter platform deck.

[0014] Further, a flow guide groove is arranged on the upper surface and / or the lower surface of the metal insert.

[0015] The flow guide groove can improve the flow speed of the resin during vacuum infusion and increase the contact area between the resin and the metal insert and the upper skin and the lower skin, thereby improving the bonding force between the upper skin and / or the lower skin and the metal insert, reducing the difficulty of process forming, improving the stability of the metal insert between the upper skin and the lower skin, and further improving the load bearing capacity of the composite deck near the metal insert.

[0016] Further, the core material includes spaced lightweight foams and vertical lattice plates.

[0017] The vertical lattice plate is used to enhance the vertical load bearing capacity of the core material and can significantly improve the Z-direction load bearing performance of the sandwich structure, thereby meeting the use requirements of the helicopter platform deck.

[0018] Further, the width of the metal insert is the same as the spacing between two adjacent vertical lattice plates.

[0019] This arrangement can place the metal insert between two adjacent vertical lattice plates, so that the metal insert is in contact with the upper skin, the lower skin, and the vertical lattice plates on both sides during resin infusion, thereby achieving the connection of the metal insert with the upper skin, the lower skin, and the vertical lattice plates on both sides. Through the support of the above structure, the connection stability of the metal insert with the framework in the composite deck is further improved, and the load bearing capacity is enhanced.

[0020] Further, the upper skin, the lower skin, and the vertical lattice plate are made of glass fiber fabric or carbon fiber fabric.

[0021] Glass fiber fabric and carbon fiber fabric both have good flame retardant properties and excellent load bearing performance and corrosion resistance. Using glass fiber fabric or carbon fiber fabric as the material of the upper skin, the lower skin, and the vertical lattice plate can significantly improve the fireproof performance and corrosion resistance of the helicopter platform deck while meeting the load bearing performance requirements.

[0022] Further, the metal insert is subjected to sand blasting treatment before being integrally formed with the upper skin, core material and lower skin by resin vacuum infusion.

[0023] The arrangement can improve the surface roughness of the metal insert, improve the bonding strength of the metal insert with the upper skin and lower skin, and improve the surface strength of the metal insert, thereby improving the carrying capacity of the helicopter platform deck.

[0024] The application further discloses a preparation method of the helicopter platform deck, and the preparation method comprises the following steps:

[0025] S1: cleaning the preparation platform;

[0026] S2: laying a sealing film on the preparation platform;

[0027] S3: laying a lower skin on the sealing film;

[0028] S4: placing lightweight foam and vertical lattice plates on the lower skin to form a core material with lattice reinforcement structure;

[0029] S5: cutting the arrangement position of the metal insert on the core material, and arranging the metal insert in the core material;

[0030] S6: arranging filling foam in the weight-reducing groove of the metal insert, and plugging the preset stepped holes of the metal insert with the foam;

[0031] S7: laying an upper skin on the assembly formed by the core material and the metal insert;

[0032] S8: arranging a release cloth, a flow guide net, a steel net, an air suction pipe and a glue injection pipe on the upper skin;

[0033] S9: wrapping the arranged structure with the sealing film, and performing vacuumization through an air suction device;

[0034] S10: injecting the prepared resin through the glue injection pipe;

[0035] S11: demolding;

[0036] S12: completing the preparation.

[0037] Through the above steps, the metal insert can be synchronously vacuum infusion integrated with the upper skin, the core material and the lower skin, so that the stable connection of the composite deck and the framework is realized, since the metal insert is previously arranged in the composite deck, the connection bolt is directly connected with the metal insert during installation, so that the installation process is greatly simplified, and since the connection bolt is integrally connected with the metal insert, no local pressure is applied to the upper skin and / or the lower skin of the composite deck, so that the problem of local stress concentration on the surface of the composite deck is avoided, the load-carrying capacity of the connection structure is improved while the connection strength is ensured, the use stability of the composite deck is ensured, meanwhile, since the metal insert is arranged in the interior of the composite deck, the contact with the outside is little, so that the corrosion resistance is significantly enhanced, through the integrated infusion forming with the upper skin and the lower skin, the deformation of the metal insert in use is also significantly reduced, through the arrangement of the weight reduction groove, the weight of the joint is significantly reduced, so that the weight of the joint is greatly reduced while meeting the use requirements of the helicopter platform deck, and the connection mode of the fixed connection of the composite deck and the framework through the connection bolt and the metal insert is simple, easy to disassemble and convenient for maintenance or replacement of parts.

[0038] Compared with the prior art, the connection structure of the helicopter platform deck and the preparation method have the following advantages:

[0039] The metal insert embedded during the synchronous forming with the composite deck is arranged, the mechanical connection between the composite deck and the framework is realized, the connection strength is large, the structure weight is light, the permanent deformation is small and corrosion is not easy, the load requirement of the composite helicopter platform deck is met while the connection strength of the helicopter platform deck and the framework is ensured, the problem of local stress concentration of the punching part during mechanical connection is avoided through the arrangement of the pre-set stepped hole of the insert, and the stability of the connection of the helicopter platform deck and the framework is ensured. The connection structure of the helicopter platform deck provided by the application is simple in structure, easy to manufacture, light in weight, small in deformation and not easy to corrode. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0041] Figure 1 The top view of the connection structure of the helicopter platform deck when connected with the framework is described in the embodiments of the present application.

[0042] Figure 2 The top view of the connection structure of the helicopter platform deck when connected with the framework is described in the embodiments of the present application. Figure 1A-A section of the composite deck structure schematic diagram;

[0043] Figure 3 The composite deck near the metal insert position described in the embodiment of the present application is a top view;

[0044] Figure 4 For Figure 3 B-B section of the composite deck structure schematic diagram;

[0045] Figure 5 The metal insert described in the embodiment of the present application is a schematic diagram of the structure;

[0046] Figure 6 The metal insert described in the embodiment of the present application is a top view;

[0047] Figure 7 For Figure 6 C-C section of the composite deck structure schematic diagram;

[0048] Figure 8 The metal insert described in the embodiment of the present application is a bottom view.

[0049] Explanation of reference signs:

[0050] 1, composite deck; 11, upper skin; 12, core material; 13, lower skin; 2, skeleton; 3, joint; 4, connecting bolt; 5, metal insert; 51, pre-set stepped hole; 52, flow guide groove; 53, weight reduction groove; 6, filling foam. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the present application, not all embodiments. The specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] The connecting structure of a helicopter platform deck and the preparation method are described in detail below.

[0053] Embodiment 1

[0054] The present embodiment provides a connecting structure of a helicopter platform deck, as Figures 1-8As shown, it comprises a composite deck 1 and a metal insert 5 for fixed connection of the composite deck 1 and the framework 2, the composite deck 1 is a composite sandwich structure formed by an upper skin 11, a core material 12 and a lower skin 13, the metal insert 5 is arranged in the core material layer of the composite deck 1 and is integrally formed with the upper skin 11, the core material 12 and the lower skin 13 by resin vacuum infusion. In the prior art, the connection of the composite deck 1 and the framework 2 needs to be provided with an auxiliary connecting piece, and needs to punch holes on the composite deck 1 or clamp the end of the composite deck 1 and the framework 2 for connection. This connection mode will cause great local stress on the composite deck 1 at the connection position, so that it cannot withstand large bending load and impact load, and is easily damaged when the composite deck 1 is under pressure, and is also prone to electrochemical corrosion, which seriously affects the service life and safety of the composite deck 1. In this embodiment, the metal insert 5 is integrally formed with the composite deck 1 by the arrangement of the metal insert 5 and the composite deck 1, which is pre-set in the composite deck 1. On the one hand, it reduces the number of parts when connecting the helicopter platform deck and the framework 2, and improves the assembly efficiency of the helicopter platform deck. On the other hand, the metal insert 5 and the composite deck 1 are integrally formed by resin vacuum infusion, which has good combination and greatly improves the connection stability of the composite deck 1 and the framework 2. In addition, during connection, the fastener is directly connected with the metal insert 5, avoiding the phenomenon of local stress concentration on the composite deck 1, improving the safety and service life of the composite deck 1. The helicopter platform deck formed by the above connection structure has the advantages of large connection strength, light structure weight, small permanent deformation and corrosion resistance. While ensuring the connection strength of the composite deck 1 and the framework 2, it meets the load requirements of the composite helicopter platform deck.

[0055] As an embodiment of the present application, a preset stepped hole 51 is arranged on the metal insert 5, and the connecting bolt 4 is connected with the framework 2 through the preset stepped hole 51. Through the arrangement of the preset stepped hole 51, the connecting bolt 4 is all crimped on the metal insert 5 during connection, avoiding the connecting bolt 4 applying pressure to the upper skin 11, thereby avoiding the phenomenon of local stress concentration on the composite deck 1. At the same time, the arrangement of the preset stepped hole 51 allows the nut of the connecting bolt 4 to be accommodated in the stepped groove of the preset stepped hole 51, avoiding the nut protruding on the upper surface of the composite deck 1, ensuring the flatness of the composite deck 1. In addition, the metal insert 5 is arranged inside the composite deck 1 and has little contact with the external environment, effectively improving the corrosion resistance of the metal insert 5, avoiding electrochemical corrosion and prolonging the service life of the connection structure.

[0056] As one of the preferred embodiments, the metal insert 5 is provided with a weight-reducing groove 53. It should be understood that the density of the metal insert 5 is much greater than that of the composite deck 1, so that the metal insert 5 is prone to local deformation due to excessive weight. The provision of the weight-reducing groove 53 can significantly reduce the weight of the metal insert 5, thereby overcoming the disadvantage of the heavy mechanical connection joint in the prior art. At the same time, the provision of the weight-reducing groove 53 increases the contact area between the metal insert 5 and the core material 12, which helps to improve the bonding force between the metal insert 5 and the core material 12, avoids relative displacement of the metal insert 5 when subjected to load, and ensures the stability of the helicopter platform deck in use. In one optional embodiment, the weight-reducing groove 53 is annularly arranged on the circumference of the metal insert 5. This arrangement allows the weight-reducing groove 53 to be formed in one process, thereby significantly reducing the weight of the metal insert 5, reducing material consumption, simplifying the process forming step, and reducing production costs. As an optional embodiment, the weight-reducing groove 53 is provided with a filling foam 6 to reduce the consumption of resin and the weight of the composite deck 1.

[0057] In one optional embodiment, the height of the metal insert 5 is the same as the height of the core material 12. Through the above arrangement, the upper surface of the metal insert 5 directly supports the upper skin 11, and the lower surface of the metal insert 5 directly supports the lower skin 13, avoiding the presence of the core material 12 between the upper and lower surfaces of the metal insert 5 and the upper and lower skins, which leads to a decrease in the load-bearing capacity of the metal insert 5 and the composite deck 1. Through the contact arrangement of the metal insert 5 with the upper skin 11 and the lower skin 13, the load-bearing capacity of the position where the metal insert 5 is located is greatly improved, ensuring the use performance of the composite deck 1.

[0058] As part of the optional embodiment, the upper surface and / or the lower surface of the metal insert 5 is provided with a flow guide groove 52. The provision of the flow guide groove 52 can improve the flow speed of the resin during vacuum infusion, and increase the contact area between the resin and the metal insert 5, the upper skin 11 and the lower skin 13, thereby improving the bonding force between the metal insert 5 and the upper skin 11 and / or the lower skin 13, and improving the stability of the metal insert 5 between the upper skin 11 and the lower skin 13, and further improving the load-bearing capacity of the position of the composite deck 1 close to the metal insert 5, while reducing the difficulty of process forming.

[0059] As one of the embodiments, the flow guide groove 52 is arranged in a staggered manner as shown in the figure. This arrangement helps to uniformly infuse and flow the resin, significantly improves the bonding force between the lightweight foam and the upper skin 11 and / or the lower skin 13, and avoids the problem of easy cracking caused by the use of glue in the prior art.

[0060] As one of the preferred embodiments, the core material 12 comprises light foam and vertical lattice plates arranged at intervals. The vertical lattice plates are used to enhance the bearing capacity of the core material 12 in the vertical direction. Since the helicopter platform deck mainly bears bending load, the helicopter platform deck is made of composite material with a sandwich structure in this embodiment. Under the action of bending, the upper and lower surfaces of the deck bear a large stress level, while the core structure bears a small stress level, and the requirement for the bearing performance is relatively low. However, the plane pressure bearing performance of the helicopter platform deck is consistent with the pressure bearing performance of the core material 12. If the core material 12 is entirely made of light foam, the pressure bearing capacity of the helicopter platform deck will be too low to meet the working condition requirements of the helicopter platform deck bearing compression surface load (Z direction, i.e. vertical direction). In this embodiment, the vertical lattice plates and light foam are arranged at intervals to form a lattice reinforced structure, which can significantly improve the Z direction bearing performance of the sandwich structure, thereby meeting the use requirements of the helicopter platform deck. The structure has excellent mechanical properties, small product weight, and low cost.

[0061] As an optional embodiment, as an embodiment of the present application, the upper skin 11, the lower skin 13, and the vertical lattice plate are made of glass fiber fabric or carbon fiber fabric. It should be noted that the upper skin 11, the lower skin 13, and the vertical lattice plate can be made of the same material or different materials. The glass fiber fabric and the carbon fiber fabric both have good flame retardant performance, excellent bearing performance, and corrosion resistance. Using glass fiber fabric or carbon fiber fabric as the material of the upper skin 11, the lower skin 13, and the vertical lattice plate can significantly improve the fireproof performance and corrosion resistance of the helicopter platform deck while meeting the bearing performance requirements. In this embodiment, a three-layer sandwich structure of skin-core-skin is adopted, the upper skin 11 and the lower skin 13 are made of glass fiber or carbon fiber reinforced composite material to improve the bearing performance, and the core is made of light foam + vertical lattice plate structure, so that the overall structure of the helicopter platform deck meets the bending bearing requirements and achieves the effect of weight reduction.

[0062] As a preferred embodiment of the present application, the width of the metal insert 5 is the same as the spacing of the two adjacent vertical lattice plates. This arrangement can place the metal insert 5 between the two adjacent vertical lattice plates, so that the metal insert 5 is in contact with the upper skin 11, the lower skin 13, and the vertical lattice plates on both sides when resin infusion is used, realizing the connection of the metal insert 5 with the upper skin 11, the lower skin 13, and the vertical lattice plates on both sides. Through the support of the above structure, the connection stability of the metal insert 5 with the framework 2 in the composite deck 1 is further improved, and the bearing capacity is enhanced. As an optional embodiment, the spacing of the two adjacent vertical lattice plates is 80-100 mm, and the thickness of the vertical lattice plate is 2-4 mm.

[0063] As one of the preferred embodiments, the surface of the metal insert 5 is sandblasted before the upper skin 11, the core material 12 and the lower skin 13 are integrally formed by resin vacuum infusion. This setting can improve the surface roughness of the metal insert 5, improve the bonding strength of the metal insert 5 with the upper skin 11 and the lower skin 13, and improve the surface strength of the metal insert 5, thereby improving the carrying capacity of the helicopter platform deck.

[0064] In some optional embodiments, the material of the metal insert 5 is one of stainless steel, aluminum alloy, titanium alloy, and carbon steel, which can be selected according to the use requirements or use environment, and is not limited here.

[0065] As one of the preferred embodiments, the resin is flame-retardant epoxy-based resin and / or vinyl resin. This setting can further improve the fireproof performance of the product, thereby improving the use safety.

[0066] Among them, the glass fiber fabric can be E glass fiber fabric or high modulus E glass fiber fabric or S glass fiber fabric.

[0067] The weaving method of the glass fiber fabric or carbon fiber fabric can be one of check weaving, twill weaving, satin weaving, unidirectional weaving, and multi-axial weaving.

[0068] The light foam is one or more of PET foam, PVC foam, PU foam, PMI foam, and baswood.

[0069] As an embodiment of the present application, the thickness of the composite deck 1 is 100-150 mm.

[0070] Among them, in the assembly process of the helicopter platform deck, a high-temperature-resistant filler is applied to the joint 3 between the adjacent two composite decks 1. The high-temperature-resistant filler can use the corresponding product in the prior art, which is not limited here.

[0071] As one of the optional embodiments, a fireproof coating is provided on the upper surface of the upper skin 11, which is formed by coating with intumescent fireproof paint. The provision of the fireproof coating can further improve the fireproof performance of the composite deck 1, and the intumescent fireproof paint expands and foams when the surface of the composite deck 1 is heated, forming a heat insulation layer, which can effectively ensure that the mechanical properties of the light foam in the upper skin 11 and the core material 12 do not change due to heating, thereby significantly improving the use safety of the composite deck 1. In some optional embodiments, the intumescent fireproof paint is at least one of water-based acrylic intumescent fireproof paint, solvent-based acrylic intumescent fireproof paint, and solvent-free epoxy intumescent fireproof paint. The above fireproof paint can effectively protect the composite deck 1 and improve its fireproof performance.

[0072] As a preferred embodiment of the present application, an anti-skid wear-resistant coating is arranged on the upper surface of the fireproof coating. The arrangement of the anti-skid wear-resistant coating can increase the friction coefficient of the surface of the composite deck 1 to meet the requirements of the classification society standard, and effectively protect the fireproof coating from being damaged during the use of the composite deck 1, thereby ensuring the fireproof performance of the product. As an optional embodiment, the anti-skid wear-resistant coating is formed by quartz sand and phenolic resin, and the quartz sand is 50-80 mesh.

[0073] Embodiment 2

[0074] The present embodiment discloses a connecting structure of a helicopter platform deck and a preparation method thereof, which is used for preparing the connecting structure as described in embodiment 1.

[0075] The preparation method comprises the following steps:

[0076] Step S1: cleaning the preparation platform to ensure that the preparation platform is flat and clean;

[0077] Step S2: laying a sealing film on the preparation platform; the sealing film can be a polyester film;

[0078] Step S3: laying a lower skin on the sealing film; the arrangement and number of layers of the upper skin can be the same as or different from those of the lower skin;

[0079] Step S4: placing lightweight foam and vertical lattice plates on the lower skin to form a core material with lattice reinforcement structure;

[0080] Step S5: cutting the setting position of a metal insert on the core material, and setting the metal insert in the core material;

[0081] Step S6: setting filling foam in the weight-reducing groove of the metal insert, and plugging the preset stepped hole of the metal insert with the foam;

[0082] Step S7: laying an upper skin on the assembly formed by the core material and the metal insert;

[0083] Step S8: arranging release cloth, flow guide net, steel mesh, air suction pipe, glue injection pipe and other devices on the upper skin;

[0084] Step S9: wrapping the arranged structure with the sealing film, and vacuumizing through the air suction equipment;

[0085] Step S10: injecting the prepared resin through the glue injection pipe;

[0086] Step S11: demolding;

[0087] Step S12: completing the preparation.

[0088] Wherein, when the lightweight foam and the vertical lattice are set in step S4, the way of interlaced winding the lightweight foam with the base material formed by the glass fiber fabric or the carbon fiber fabric can be adopted, such as when the vertical lattice is set in two adjacent lightweight foams, the base material is first wound from the upper surface of the first lightweight foam, then passes through the middle of the two lightweight foams, and then is wound from the lower surface of the second lightweight foam, the structure in the middle of the two lightweight foams is the vertical lattice, the base material wound on the upper surface of the lightweight foam constitutes part of the upper skin 11, resulting in that the thickness of the upper skin 11 is greater than the thickness of the lower skin 13 corresponding to the same lightweight foam by the thickness of the vertical lattice, the base material wound on the lower surface of the lightweight foam constitutes part of the lower skin 13, resulting in that the thickness of the lower skin 13 is greater than the thickness of the upper skin 11 corresponding to the same lightweight foam by the thickness of the vertical lattice, the setting makes the vertical lattice generated by winding with one base material, avoids the dispersion setting of the vertical lattice, helps the preparation of the production material, and also avoids the relative displacement of the dispersedly set vertical lattice between the lightweight foams, so as to avoid the situation that the production efficiency is affected.

[0089] As an optional embodiment, before step S12, it further includes:

[0090] Step S120: Drill holes at the positions of the metal inserts on the composite deck, and punch the upper skin and the lower skin through the preset stepped holes on the metal inserts.

[0091] Step S120 can be performed during preparation or during on-site installation, wherein when drilling, only the upper skin 11 and the lower skin 13 can be punched, and the blocking foam can be crushed by the connecting bolt 4 when the connecting bolt 4 is set.

[0092] Through the above steps, the metal insert 5 can be synchronously vacuum infusion integrated with the upper skin 11, the core material 12 and the lower skin 13, so that the stable connection of the composite deck 1 and the framework 2 is realized. Since the metal insert 5 is pre-installed in the composite deck 1, it can be directly connected with the metal insert 5 through the connecting bolt 4 during installation, so that the installation process is greatly simplified. Since the connecting bolt 4 is integrally connected with the metal insert 5, no local pressure is applied to the upper skin 11 and / or the lower skin 13 of the composite deck 1, so that the problem of local stress concentration on the surface of the composite deck 1 is avoided. The load-carrying capacity of the connecting structure is improved while the connection strength is ensured, so that the use stability of the composite deck 1 is ensured. Since the metal insert 5 is arranged in the interior of the composite deck 1, it has little contact with the outside, so that the corrosion resistance is significantly improved. Through the integrated infusion forming with the upper skin 11 and the lower skin 13, the deformation of the metal insert 5 during use is significantly reduced. Through the arrangement of the weight reduction groove 53, the weight of the joint is significantly reduced, so that the weight of the joint is greatly reduced while meeting the use requirements of the helicopter platform deck. The connecting mode of the connecting bolt 4 and the metal insert 5 for fixedly connecting the composite deck 1 and the framework 2 is simple and easy to disassemble, so that the maintenance or replacement of the parts is facilitated.

[0093] It should be noted that all the terms indicating direction and position in the present application, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "low", "tail end", "head end", "center" and the like, are only used to explain the relative position relationship, connection condition and the like between the components in a certain state, and are only for the convenience of describing the present application, and thus cannot be understood as a limitation on the present application. In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme.

[0094] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood in a broad sense. For example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0095] Although the present application has been disclosed with reference to the above embodiments, the application is not limited to the above embodiments. It will be apparent to those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the application. The scope of the application should be limited only by the appended claims.

Claims

1. A connection structure of a helicopter platform deck, characterized by, The composite deck (1) and the metal insert (5) are used for the fixed connection of the composite deck (1) and the framework (2) below the composite deck (1), the composite deck (1) is a composite sandwich structure formed by an upper skin (11), a core material (12) and a lower skin (13), the metal insert (5) is arranged in the core material layer of the composite deck (1) and is integrally formed with the upper skin (11), the core material (12) and the lower skin (13) through resin vacuum infusion; A preset stepped hole (51) is arranged on the metal insert (5), and a connecting bolt (4) is connected with the framework (2) through the preset stepped hole (51); the connecting bolt (4) is all crimped on the metal insert (5) when being connected; The core material (12) comprises spaced light foams and vertical lattice plates, the vertical lattice plates are used for enhancing the vertical bearing capacity of the core material, when the vertical lattice plate is arranged in two adjacent light foams, the base material first passes over the upper surface of the first light foam, then passes through the middle of the two light foams, and then passes over the lower surface of the second light foam, the structure in the middle of the two light foams is the vertical lattice plate, the base material wound on the upper surface of the light foam forms part of the upper skin (11), so that the thickness of the upper skin (11) is greater than the thickness of the lower skin (13) corresponding to the same light foam by the thickness of the vertical lattice plate, the base material wound on the lower surface of the light foam forms part of the lower skin (13), so that the thickness of the lower skin (13) is greater than the thickness of the upper skin (11) corresponding to the same light foam by the thickness of the vertical lattice plate; the thickness of the vertical lattice plate is 2-4 mm.

2. The connection structure of a helicopter platform deck according to claim 1, characterized in that, The height of the metal insert (5) is the same as the height of the core material (12).

3. The connection structure of a helicopter platform deck according to claim 1, characterized in that, A weight-reducing groove (53) is arranged on the metal insert (5).

4. The connection structure of a helicopter platform deck according to claim 3, characterized in that, A flow guide groove (52) is arranged on the upper surface and / or the lower surface of the metal insert (5).

5. The connection structure of a helicopter platform deck according to claim 1, characterized in that, The width of the metal insert (5) is the same as the spacing of two adjacent vertical lattice plates.

6. The connection structure of a helicopter platform deck according to claim 1, characterized in that, The upper skin (11), the lower skin (13) and the vertical lattice plate are glass fiber fabric or carbon fiber fabric.

7. The connection structure of a helicopter platform deck according to claim 1, characterized in that, The surface of the metal insert (5) is subjected to sand blasting treatment before being integrally formed with the upper skin (11), the core material (12) and the lower skin (13) through resin vacuum infusion.

8. A method of preparing a helicopter platform deck, characterized in that, The helicopter platform deck comprises the connecting structure according to any one of claims 1-7, and the preparation method comprises: Step S1: cleaning the preparation platform; Step S2: laying a sealing film on the preparation platform; Step S3: laying a lower skin on the sealing film; Step S4: placing light foams and vertical lattice plates on the lower skin to form a core material with lattice reinforcement structure; Step S5: cutting a setting position of a metal insert on the core material and arranging the metal insert in the core material; Step S6: arranging filling foams in the weight-reducing groove of the metal insert and sealing the preset stepped hole of the metal insert with the foams; Step S7: laying an upper skin on the assembly of the core material and the metal insert. Step S8: setting release cloth, flow guide net, steel net, air suction pipe and glue injection pipe on the upper skin; Step S9: wrapping the set structure with sealing film and vacuumizing through air suction equipment; Step S10: injecting the prepared resin through the glue injection pipe; Step S11: releasing the mold; Step S12: completing the preparation.

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