Interlayer composite material structure end wall, train body and train

Abstract

The utility model discloses an end wall of an interlayer composite material structure, a train body and a train, and relates to the technical field of rail transit, the end wall of the interlayer composite material structure comprises an inner panel, an outer panel and a sandwich, the sandwich comprises a sandwich main body and a sandwich embedded part, and the sandwich main body is clamped between the inner panel and the outer panel; the sandwich embedded part is embedded in the sandwich main body, the sandwich embedded part is provided with a metal inner core, and the metal inner core is used for providing a mounting interface. According to the sandwich composite material structure end wall, the metal inner core is arranged in the sandwich embedded part to serve as the mounting interface, so that the problem that the composite material end wall is difficult to directly punch to mount parts is effectively solved, and the application flexibility and the overall strength of the end wall structure are improved.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a sandwich composite material structure end wall, car body and train. Background Technology

[0002] With the development of modern transportation, especially the advancement of high-speed train technology, the requirements for vehicle structural materials are becoming increasingly stringent. Lightweight, high strength, and high rigidity have become important indicators in vehicle structural design.

[0003] Although composite end walls offer significant advantages in weight reduction, improved corrosion resistance, and fatigue resistance, overcoming many of the drawbacks of metal end walls, they still present certain limitations in providing mounting interfaces for other components in practical applications. Due to the material properties of composites, their surfaces are difficult to directly drill or machine for mounting various components, which restricts the flexibility of composite end walls in vehicle body structures. Traditional drilling methods can damage the composite structure, affecting its overall strength and durability, especially in applications like high-speed trains where structural integrity is paramount. Therefore, effectively mounting various components on composite end walls has become a pressing technical challenge. Utility Model Content

[0004] The purpose of this application is to provide a sandwich composite material structure end wall. By setting a metal inner core in the sandwich insert as an installation interface, the problem of difficulty in directly drilling holes to install components in composite material end walls is effectively solved, thereby improving the application flexibility and overall strength of the end wall structure. Another purpose of this application is to provide a car body and train.

[0005] To achieve the above objectives, this application provides a sandwich composite material structure end wall, including an inner panel, an outer panel, and a core, wherein the core includes:

[0006] The core body is sandwiched between the inner panel and the outer panel;

[0007] A sandwich insert is embedded inside the sandwich body. The sandwich insert has a metal inner core, which is used to provide an installation interface.

[0008] In some embodiments, the sandwich insert includes a housing and the metal core, the housing having an open cavity for receiving the metal core.

[0009] In some embodiments, the housing is a composite material shell.

[0010] In some embodiments, the sandwich insert includes a first insert and a second insert, wherein the first insert is disposed in a direction parallel to the thickness direction of the end wall of the sandwich composite material structure, and the second insert is disposed in a direction perpendicular to the direction of the first insert.

[0011] In some embodiments, the middle of the end wall of the sandwich composite material structure is provided with a passageway;

[0012] The first insert has two metal core surfaces facing the inner panel and the outer panel respectively, and the second insert has a single metal core surface facing the passageway; and / or,

[0013] The first insert has a pair of support structures. The first support structure of the first insert faces the inner panel, and the second support structure of the first insert faces the outer panel. The second insert has a single support structure, which faces the passageway. The support structure includes two ear plates.

[0014] In some embodiments, the sandwich body includes a sandwich middle frame, sandwich blocks and a sandwich outer frame. The sandwich middle frame is provided with the sandwich insert. The sandwich blocks are disposed on both sides of the sandwich middle frame and between the sandwich outer frame, and the sandwich blocks are spaced apart.

[0015] In some embodiments, the edges of the inner panel and the outer panel are provided with overlapping joints, and the core is provided with a groove for accommodating the joints; or,

[0016] The inner panel has a joint that connects with the outer panel, and the core has a connecting plate that connects with the joint.

[0017] In some embodiments, the core insert is integrally cured and molded with the core body.

[0018] This application also provides a vehicle body, including the aforementioned sandwich composite material structure end wall.

[0019] This application also provides a train, including the aforementioned car body.

[0020] Compared with the above background technology, the sandwich composite material structure end wall provided in this application mainly includes an inner panel, an outer panel and a core. The core includes a core body and a core insert. The core body is sandwiched between the inner panel and the outer panel. The core insert is embedded inside the core body and has a metal core. The metal core is used to provide an installation interface.

[0021] The main problem with composite end walls mentioned in the background section is that, due to the properties of composite materials, their surfaces are difficult to directly drill or machine for installing various components. This limits the flexibility of composite end walls in vehicle body structures. Traditional drilling installation methods may damage the composite structure, affecting its overall strength and durability, especially in applications like high-speed trains where structural integrity is paramount.

[0022] To address this technical problem, the sandwich composite material structural end wall provided in this application effectively solves the aforementioned challenges through an innovative design. The structural end wall includes an inner panel, an outer panel, and a core, wherein the core consists of a core body and a core insert. The core body is sandwiched between the inner and outer panels, while the core insert is embedded inside the core body. The key innovation lies in the metal core incorporated within the core insert, which serves as an installation interface for mounting various components.

[0023] The advantage of this design is that the metal core can withstand the mechanical stress during drilling and installation without damaging the main structure of the composite material. Due to the addition of the metal core, the composite endwall can now be directly used to install various components without worrying about damaging the composite material itself. This design not only improves the application flexibility of the endwall structure by making it easier to integrate different components, but also enhances the overall structural strength, as the addition of the metal core strengthens the endwall's load-bearing capacity.

[0024] Based on the above structural and process descriptions, it can be seen that the sandwich composite material structure end wall has at least the following beneficial effects: by setting a metal inner core in the sandwich insert as an installation interface, the sandwich composite material structure end wall effectively solves the problem that it is difficult to directly drill holes to install components in the composite material end wall, thereby improving the application flexibility and overall strength of the end wall structure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 A schematic diagram of the end wall of the sandwich composite material structure provided in the embodiments of this application;

[0027] Figure 2 A schematic diagram of the first embedding element provided in an embodiment of this application;

[0028] Figure 3 A schematic diagram of the second embedding provided in an embodiment of this application;

[0029] Figure 4 A schematic diagram of the sandwich body provided in the embodiments of this application;

[0030] Figure 5 A schematic diagram of a connecting plate provided in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of a connecting plate provided in another embodiment of this application.

[0032] in:

[0033] Inner panel 1, outer panel 2, sandwich core 3, passageway 4,

[0034] The sandwich body 31, sandwich middle frame 311, sandwich block 312, sandwich outer frame 313, sandwich insert 32, metal inner core 321, metal core surface 32101, shell 322, support structure 323, ear plate 3231, first insert 3201, second insert 3202, and connecting plate 33. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the end wall of the sandwich composite material structure provided in an embodiment of this application. Figure 2 A schematic diagram of the first embedding provided in an embodiment of this application.

[0038] In a first specific embodiment, the sandwich composite material structure end wall provided in this application mainly includes an inner panel 1, an outer panel 2, and a core 3. The core 3 includes a core body 31 and a core insert 32. The core body 31 is sandwiched between the inner panel 1 and the outer panel 2. The core insert 32 is embedded inside the core body 31. The core insert 32 is provided with a metal inner core 321, which is used to provide an installation interface.

[0039] The main problem with composite end walls mentioned in the background section is that, due to the properties of composite materials, their surfaces are difficult to directly drill or machine for installing various components. This limits the flexibility of composite end walls in vehicle body structures. Traditional drilling installation methods may damage the composite structure, affecting its overall strength and durability, especially in applications like high-speed trains where structural integrity is paramount.

[0040] To address this technical problem, the sandwich composite material structural end wall provided in this application effectively solves the aforementioned challenges through an innovative design. The structural end wall includes an inner panel 1, an outer panel 2, and a core 3, wherein the core 3 consists of a core body 31 and a core insert 32. The core body 31 is sandwiched between the inner panel 1 and the outer panel 2, while the core insert 32 is embedded inside the core body 31. The key innovation lies in the metal inner core 321 provided within the core insert 32, which serves as an installation interface for mounting various components.

[0041] The advantage of this design is that the metal core 321 can withstand the mechanical stress during drilling and installation without damaging the main structure of the composite material. Due to the addition of the metal core 321, the composite endwall can now be directly used to install various components without worrying about damaging the composite material itself. This design not only improves the application flexibility of the endwall structure by making it easier to integrate different components, but also enhances the overall structural strength, as the addition of the metal core 321 strengthens the load-bearing capacity of the endwall.

[0042] Based on the above structural and process descriptions, it can be seen that the sandwich composite material structure end wall has at least the following beneficial effects: by setting a metal inner core 321 in the sandwich insert 32 as an installation interface, the sandwich composite material structure end wall effectively solves the problem that it is difficult to directly drill holes to install parts in the composite material end wall, thereby improving the application flexibility and overall strength of the end wall structure.

[0043] In some cases, the manufacturing process of the end wall of the sandwich composite structure is described below.

[0044] The fabrication process of the sandwich composite material structure end wall first involves the manufacturing of the core 3, which includes a core body 31 and a core insert 32. The core body 31 is designed to be sandwiched between the inner panel and the outer panel, while the core insert 32 is embedded inside the core body 31. The core insert 32 has a metal inner core 321, which is used to provide an installation interface.

[0045] The manufacturing process typically begins with the molding of the sandwich body 31, followed by the insertion of the sandwich insert 32 to ensure the correct positioning of the metal inner core 321; alternatively, the sandwich body 31 and the metal inner core 321 can be molded together. Next, the inner and outer panels are placed on either side of the sandwich body 31 and secured by some means (e.g., adhesive or mechanical connection) to form a stable sandwich structure. This structure not only provides high strength and rigidity but also allows for the direct mounting of various components through the metal inner core 321 without the need for drilling or machining the composite material itself, thus avoiding potential structural damage.

[0046] Through this manufacturing process, the sandwich composite material structure end wall achieves the goals of lightweighting and high strength, while providing excellent installation flexibility, meeting the high requirements of high-performance transportation vehicles such as high-speed trains for the integrity and reliability of the vehicle body structure.

[0047] In some cases, the application process of end walls in sandwich composite material structures is described below.

[0048] The process involves how to install components using the metal core 321 on the end wall of the sandwich composite structure. Taking the outer panel 2 as an example, firstly, holes are positioned and drilled on the surface of the outer panel 2, these holes being designed to correspond to the positions of the metal core 321. This design allows fasteners, such as bolts or screws, to pass directly through the holes in the outer panel 2 and be drilled into the metal core 321.

[0049] Due to the metallic properties of the inner metal core 321, it can withstand the stress of the fasteners without damage, ensuring the reliability and safety of the installation process. After the fasteners pass through the holes in the outer panel 2, they can directly engage with the inner metal core 321 and be secured inside, thus allowing the components to be stably installed on the end wall. The surface of the inner panel 1 can also be perforated as needed to allow for the installation or maintenance of components from the inside.

[0050] The advantage of this installation method is that it avoids destructive drilling into the composite material components, thus maintaining the overall structural integrity and durability of the end wall. The metal core 321 serves as the installation interface, providing a robust connection point that ensures both secure and convenient installation of components, significantly improving the end wall's flexibility and ease of maintenance. In this way, sandwich composite material end walls can adapt to various installation requirements, meeting the needs of high-speed trains and other transportation vehicles for rapid installation and replacement of structural components during operation and maintenance.

[0051] In some embodiments, the sandwich insert 32 includes a housing 322 and a metal core 321, the housing 322 having an open inner cavity for receiving the metal core 321.

[0052] In this embodiment, the design of the sandwich insert 32 particularly emphasizes the combination of the housing 322 and the metal inner core 321. The main function of the housing 322 is to enclose the metal inner core 321, so that the metal inner core 321 can be embedded as a whole during the processing of the sandwich body 31, simplifying the manufacturing process and improving the overall structure.

[0053] The housing 322 can be made of any suitable material, not limited to a specific one, which provides design flexibility, allowing the selection of the most suitable material based on the actual application requirements and environment. Similarly, the open interior design of the housing 322 does not limit the number or direction of openings, meaning that multiple openings or openings in different directions can be designed as needed to adapt to different installation and usage requirements.

[0054] Furthermore, there are no specific restrictions on how the metal core 321 is fixed in the housing 322; various methods can be used to ensure the stable positioning of the metal core 321 within the housing 322. This flexibility allows designers to choose the most suitable fixing method based on specific application scenarios and structural requirements, whether through adhesion, mechanical fixing, or any other reliable method.

[0055] In some embodiments, housing 322 is a composite material shell.

[0056] In this embodiment, the housing 322 is specifically made of composite material, forming a sandwich insert 32 with an outer composite material and an inner metal material. This design combines the advantages of composite materials and metal materials; the composite material outer shell provides lightweight and corrosion-resistant properties, while the inner metal core 321 provides the necessary mechanical strength and mounting interface.

[0057] By defining the shell 322 as a composite material, the structure of the sandwich insert 32 becomes more specialized. This combined structure not only enhances the overall load-bearing capacity but also allows the sandwich insert 32 to better adapt to various complex mechanical and environmental conditions. The use of the composite material shell reduces the overall structural weight while maintaining sufficient durability, while the presence of the metal core 321 ensures reliability when high-strength connections are required.

[0058] Please continue to refer to this. Figure 2 And refer to Figure 3 , Figure 3 A schematic diagram of the second embedding provided in an embodiment of this application.

[0059] In some embodiments, the sandwich insert 32 includes a first insert 3201 and a second insert 3202. The first insert 3201 is arranged in a direction parallel to the thickness direction of the end wall of the sandwich composite material structure, and the second insert 3202 is arranged in a direction perpendicular to the direction of the first insert 3201.

[0060] In this embodiment, the design of the sandwich insert 32 includes two different inserts: a first insert 3201 and a second insert 3202. The main feature of this design is that the two inserts are arranged in different directions. The first insert 3201 is arranged parallel to the thickness direction of the end wall of the sandwich composite material structure, while the second insert 3202 is arranged perpendicular to the arrangement direction of the first insert 3201.

[0061] This staggered arrangement of horizontal and vertical elements creates a structure similar to horizontal and vertical reinforcing beams within the sandwich insert 32, enhancing the overall stability and load-bearing capacity of the end wall. The first insert 3201 provides longitudinal reinforcement along the thickness direction of the end wall, while the second insert 3202 provides additional lateral support. This design allows the sandwich composite material structure end wall to better distribute and withstand forces from different directions.

[0062] This structural design optimizes mechanical properties by arranging inserts in different directions, improving the overall stiffness and strength of the sandwich structure while enhancing its adaptability to complex loads. This design not only improves the performance of the end walls but also makes the sandwich composite material end walls more suitable for applications such as high-speed trains that have stringent requirements for structural strength and stability.

[0063] In some embodiments, the middle of the end wall of the sandwich composite material structure is provided with an access opening 4; the first insert 3201 has two metal core surfaces 32101 facing the inner panel 1 and the outer panel 2 respectively, and the second insert 3202 has a single metal core surface 32101 facing the access opening 4.

[0064] In this embodiment, the end wall of the sandwich composite material structure is specially designed with a central passage opening 4 to meet specific usage requirements or functions. Correspondingly, the first insert 3201 and the second insert 3202 are structurally different to adapt to different installation and usage conditions.

[0065] The first insert 3201 is designed with two metal core surfaces 32101, facing the inner panel 1 and the outer panel 2 respectively. This design allows the first insert 3201 to be installed at the positions of both panels, providing greater installation flexibility. Since metal core surfaces 32101 need to be provided in two directions, the housing 322 of the first insert 3201 is designed as an open, vertically continuous opening, exposing both ends of the metal core 321 and allowing operation from both sides of the inner panel 1 and the outer panel 2.

[0066] In contrast, the second insert 3202 has only one metal core surface 32101 facing the passageway 4. Therefore, its housing 322 is designed as an open-ended structure on one side, with the other end closed, and the metal core 321 is exposed at only one end. This design allows the second insert 3202 to be specifically designed for installation needs near the passageway 4, while maintaining structural integrity and stability.

[0067] Through this differentiated design, the sandwich composite material structure end wall can adapt to more installation scenarios, providing stable mounting points whether near inner panel 1, outer panel 2, or passageway 4. This design enhances the functionality of the end wall and improves its structural adaptability and practicality, making it more suitable for applications with strict requirements on structural details, such as high-speed trains.

[0068] In some embodiments, the core insert 32 is integrally formed with the core body 31.

[0069] In this embodiment, the manufacturing process of the sandwich insert 32 is carried out simultaneously with the curing process of the sandwich body 31. Specifically, the sandwich insert 32 is first placed in a pre-set position in the sandwich body 31, and then cured together with the sandwich body 31. This simultaneous curing method ensures a tight bond between the sandwich insert 32 and the sandwich body 31, forming a robust single structure.

[0070] By placing the sandwich insert 32 in a pre-processed location and simultaneously curing it, this integrated manufacturing process reduces subsequent assembly steps and improves production efficiency. At the same time, it ensures the precise positioning and stability of the sandwich insert 32 within the sandwich body 31, avoiding structural weaknesses caused by improper later assembly.

[0071] This one-piece curing technology also helps improve the overall stability and load-bearing capacity of the structure because the bonding between the sandwich insert 32 and the sandwich body 31 is more uniform and consistent. This uniform bonding also helps to distribute and withstand various forces acting on the end wall, thereby improving the performance and durability of the end wall of the entire sandwich composite structure.

[0072] Furthermore, the end walls of the sandwich composite material structure can also be simultaneously cured and molded.

[0073] In some embodiments, the first insert 3201 is provided with a pair of support structures 323, the first support structure of the first insert 3201 is disposed facing the inner panel 1, the second support structure of the first insert 3201 is disposed facing the outer panel 2, and the second insert 3202 is provided with a single support structure 323, the support structure of the second insert 3202 is disposed facing the passage 4; the support structure 323 includes two ear plates 3231.

[0074] In this embodiment, the design of the first insert 3201 and the second insert 3202 specifically includes support structures 323. These support structures 323 enhance the connection strength during the integral curing process of the insert 32 and the sandwich body 31. Specifically, the first insert 3201 is equipped with a pair of support structures 323, one of which faces the inner panel 1 and the other faces the outer panel 2. This design allows the first insert 3201 to form a stable connection in both the inner panel 1 and the outer panel 2 directions. The second insert 3202 has one support structure 323 facing the passage 4, providing additional support and strength to the area near the passage 4.

[0075] The support structures 323 on the different inserts 32 can all be regarded as fixed flanges on the inserts 32. They not only enhance the connection strength between the inserts and the core body, but also improve the stability of the overall structure.

[0076] The support structure 323 includes ear plates 3231, which provide additional contact area and mechanical engagement when the insert 32 and the core body 31 are integrally cured, thereby ensuring a more robust structure after curing. This design is particularly suitable for areas that need to withstand large loads or frequent stresses, such as near the passageway 4, ensuring the reliability and durability of the structure during long-term use.

[0077] Specifically, each support structure 323 contains two ear plates 3231, which are symmetrically arranged with an included angle of 180°. For example... Figure 2 As shown, the first insert 3201 has two ear plates 3231 at its upper and lower ends, respectively. The front of the ear plates 3231 provides connection strength in the thickness direction of the end wall of the sandwich composite structure. The second insert 3202 has two ear plates 3231 at only one end. The front of the ear plates 3231 provides connection strength in the radial direction perpendicular to the thickness direction of the end wall of the sandwich composite structure, and the side of the ear plates 3231 provides connection strength in the thickness direction of the end wall of the sandwich composite structure.

[0078] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the sandwich body provided in an embodiment of this application.

[0079] In some embodiments, the sandwich body 31 includes a sandwich middle frame 311, sandwich blocks 312 and a sandwich outer frame 313. The sandwich middle frame 311 is provided with a sandwich insert 32. The sandwich blocks 312 are disposed on both sides of the sandwich middle frame 311 and between the sandwich outer frame 313, and the sandwich blocks 312 are spaced apart.

[0080] In this embodiment, the sandwich body 31 is structurally designed to consist of a sandwich middle frame 311, sandwich blocks 312, and a sandwich outer frame 313. The sandwich middle frame 311, as the core part of the sandwich body, has a sandwich insert 32 inside to ensure that the insert 32 is stably positioned in the sandwich body 31 and is integrally solidified with the sandwich body 31.

[0081] The sandwich panels 312 are positioned on both sides of the sandwich middle frame 311, between the sandwich outer frame 313. This layout not only enhances the overall structural strength of the sandwich body 31, but also provides additional support and stability. The spacing of the sandwich panels 312 allows the sandwich body 31 to more effectively disperse stress when subjected to external loads, reducing local stress concentration and thus improving the durability and reliability of the structure.

[0082] Through this structural design, the sandwich core 31 is a plate-beam sandwich panel structure, which can maintain lightweight while ensuring overall rigidity and strength, meeting the stringent requirements of high-performance transportation vehicles such as high-speed trains for structural components. The combination of the sandwich middle frame 311, sandwich blocks 312, and sandwich outer frame 313 not only optimizes the mechanical properties of the sandwich core 31, but also provides convenience for subsequent installation and maintenance, making the sandwich composite material structure end wall more flexible and efficient in practical applications.

[0083] In some cases, the sandwich panel 312, which is composed of multiple sections, forms horizontal and vertical reinforcing beams with the sandwich middle frame 311 and the sandwich outer frame 313. This reduces the structural weight while ensuring structural strength and rigidity. In addition, besides connecting the sandwich middle frame 311 and the sandwich outer frame 313 at both ends, the sides between the two ends of the sandwich panel 312 are set as sloping contact surfaces. The advantage of this is that during the molding process, the pressure can be effectively transmitted through the sloping contact surfaces between the sandwich panels 312, thereby improving the molding quality of the end wall structure facade.

[0084] Please refer to Figure 5 and Figure 6 ,in, Figure 5 This is a schematic diagram of the connecting plate provided in an embodiment of this application. Figure 6 This is a schematic diagram of a connecting plate provided in another embodiment of this application.

[0085] In this embodiment, the edges of the inner and outer panels form a closed structure with the core in two different ways. In the first way, the edges of the inner panel 1 and the outer panel 2 are connected by overlapping joints, and the core 3 is specially designed with grooves to accommodate these joints. This design can form a continuous outer surface, enhancing the stability and sealing of the overall structure.

[0086] In the second method, the edge of the inner panel 1 is connected to the edge of the outer panel 2 via a mating joint. In this case, the core 3 is provided with a connecting plate 33, which is connected to these joints. The function of the connecting plate 33 is to provide additional support and fixation for the mating joint, ensuring a firm and reliable connection between the inner and outer panels.

[0087] Both of these different connection methods aim to achieve a tight bond between the inner and outer panels and the core, ensuring the integrity and strength of the sandwich composite structure end wall. Overlapping and butt joint designs each have their advantages, and the most suitable connection method can be selected based on specific application requirements and manufacturing processes. Through these carefully designed connection structures, the sandwich composite structure end wall can provide good appearance and sealing performance while ensuring structural strength, meeting the stringent requirements of high-speed trains and other high-performance transportation vehicles for their body structural components.

[0088] In some cases, if the joint is a butt joint, an L-shaped connecting plate 33 is provided inside. Figure 6 ), or U-shaped connecting plate 33 ( Figure 5 The inner panel 1 and the outer panel 2 are overlapped. If the joint is in the form of an overlap, it is achieved by turning the inner panel 1 or the outer panel 2 inward.

[0089] This application also provides a vehicle body, including the aforementioned sandwich composite material structure end wall.

[0090] The vehicle body should possess all the beneficial technical effects of the aforementioned sandwich composite material structure end wall, which will not be elaborated upon here.

[0091] This application also provides a train, including the aforementioned car body.

[0092] The train should possess all the beneficial technical effects of the aforementioned sandwich composite material structure end wall, which will not be elaborated upon here.

[0093] The use of the sandwich composite material structure end wall involves the coordinated operation of the inner panel 1, the outer panel 2, and the core 3. The core 3 includes a core body 31 and a core insert 32. The core body 31 is sandwiched between the inner panel 1 and the outer panel 2, while the core insert 32 is embedded inside the core body 31 and has a metal inner core 321 for providing an installation interface.

[0094] During installation, holes are first positioned and drilled on the surface of the outer panel 2. These holes correspond to the positions of the metal inner core 321, allowing fasteners such as bolts or screws to pass directly through the holes in the outer panel 2 and be drilled into the metal inner core 321. The metal inner core 321 can have a matching structure, such as threaded holes, etc., which is not limited here. Due to the metallic properties of the metal inner core 321, it can withstand the stress of the fasteners without damage, ensuring the reliability and safety of the installation process. After the fasteners pass through the holes in the outer panel 2, they can directly engage with the metal inner core 321 and be secured inside, allowing the components to be stably installed on the end wall. The surface of the inner panel 1 can also be drilled as needed to allow for the installation or maintenance of components from the inside.

[0095] The sandwich insert 32 includes a first insert 3201 and a second insert 3202, which are positioned in different directions, forming a staggered horizontal and vertical structure, similar to horizontal and vertical reinforcing beams, enhancing the overall stability and load-bearing capacity of the end wall. The first insert 3201 has two metal core surfaces 32101, facing the inner panel 1 and the outer panel 2 respectively, while the second insert 3202 has a single metal core surface 32101, facing the passageway 4. This design allows the first insert 3201 to provide installation interfaces at both panel locations, offering greater installation flexibility, while the second insert 3202 is specifically designed for installation needs near the passageway 4, while maintaining structural integrity and stability.

[0096] The sandwich body 31 includes a sandwich middle frame 311, sandwich blocks 312, and a sandwich outer frame 313. The sandwich middle frame 311 contains sandwich inserts 32, while the sandwich blocks 312 are located on both sides of the sandwich middle frame 311 and spaced apart from the sandwich outer frame 313. This structural design allows the sandwich body 31 to more effectively distribute stress and reduce local stress concentration when subjected to external loads, thereby improving the durability and reliability of the structure.

[0097] The edges of the inner panel 1 and the outer panel 2 can be connected by lap joints or butt joints. The sandwich core 3 is provided with grooves for accommodating the joints or connecting plates 33 connected to the joints, further enhancing the structural stability of the end wall. Through these carefully designed connection structures, the sandwich composite material end wall can provide good appearance and sealing effect while ensuring structural strength, meeting the stringent requirements of high-speed trains and other high-performance transportation vehicles for vehicle body structural components.

[0098] It should be noted that many of the components mentioned in this application are general standard parts or components known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0099] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0100] The sandwich composite material structure end wall, vehicle body, and train provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A sandwich composite material structure end wall, characterized in that, It includes an inner panel, an outer panel, and a core, wherein the core includes: The core body is sandwiched between the inner panel and the outer panel; A sandwich insert is embedded inside the sandwich body. The sandwich insert has a metal inner core, which is used to provide an installation interface.

2. The end wall of the sandwich composite material structure according to claim 1, characterized in that, The sandwich insert includes a housing and the metal inner core, the housing having an open inner cavity for accommodating the metal inner core.

3. The end wall of the sandwich composite material structure according to claim 2, characterized in that, The shell is a composite material outer shell.

4. The end wall of the sandwich composite material structure according to claim 1, characterized in that, The sandwich insert includes a first insert and a second insert. The first insert is positioned parallel to the thickness direction of the end wall of the sandwich composite material structure, and the second insert is positioned perpendicular to the first insert.

5. The end wall of the sandwich composite material structure according to claim 4, characterized in that, An access opening is provided in the middle of the end wall of the sandwich composite material structure; The first insert has two metal core surfaces facing the inner panel and the outer panel respectively, and the second insert has a single metal core surface facing the passageway; and / or, The first insert has a pair of support structures. The first support structure of the first insert faces the inner panel, and the second support structure of the first insert faces the outer panel. The second insert has a single support structure, which faces the passageway. The support structure includes two ear plates.

6. The end wall of the sandwich composite material structure according to claim 1, characterized in that, The sandwich body includes a sandwich middle frame, sandwich blocks and a sandwich outer frame. The sandwich middle frame is provided with the sandwich insert. The sandwich blocks are located on both sides of the sandwich middle frame and between the sandwich outer frame, and the sandwich blocks are spaced apart.

7. The end wall of the sandwich composite material structure according to claim 1, characterized in that, The inner panel has an overlapping joint with the outer panel, and the core has a groove for accommodating the joint; or, The inner panel has a joint that connects with the outer panel, and the core has a connecting plate that connects with the joint.

8. The end wall of the sandwich composite material structure according to claim 1, characterized in that, The core insert is integrally cured and molded with the core body.

9. A vehicle body, characterized in that, Includes the sandwich composite material structure end wall as described in any one of claims 1 to 8.

10. A train, characterized in that, Includes the vehicle body as described in claim 9.

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