Sandwich board, vehicle body and rail vehicle

Abstract

The invention relates to the technical field of plates, and provides a laminboard, a vehicle body and a railway vehicle, the laminboard comprises a core layer and at least two layers of panels; the core layer is arranged between the two layers of panels, the core layer is fixedly connected with the panels, at least two cavity channels distributed in the first direction are formed in the two sides of the core layer, any two cavity channels are mutually independent, the cavity channels swing and extend in the second direction, the first direction and the second direction are both parallel to the panels, and the first direction is perpendicular to the second direction. Therefore, the arrangement of the core layer and the cavity channel not only conforms to the lightweight design, but also increases the overall structural rigidity of the sandwich panel and improves the bearing capacity. The cavity channels are in the swing curve shape, any two cavity channels are independent of each other, the direct transmission path of sound waves is reduced, the propagation difficulty of the sound waves is increased, the energy absorbed when the side walls of the cavity channels reflect the sound waves is increased, the propagation capacity of the sound waves from one side of the sandwich panel to the other side of the sandwich panel is effectively reduced, and the sound insulation effect of the sandwich panel is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plate materials and provides a sandwich panel, a vehicle body and a rail vehicle. Background Art

[0002] As the interior panels of rail vehicles, they not only affect the passengers' riding experience, but also have an important impact on the overall performance and safety of rail vehicles. Taking the interior floor of rail vehicles as an example, it needs to have sufficient supporting and bearing capacity, meet the requirements of lightweight design, and have sound insulation effect to improve the noise problem inside the vehicle body.

[0003] At present, plywood, aluminum honeycomb panels, phenolic resin foam panels, foamed aluminum floors, etc. are used as interior floors of rail vehicles. Among these panels, panels with good sound insulation have the problem of heavy weight, such as plywood; while panels with relatively light weight have the problem of poor sound insulation, such as aluminum honeycomb panels; panels with relatively light weight and good sound insulation also have the problem of poor mechanical properties and cannot provide sufficient supporting and bearing capacity, such as phenolic resin foam floors and foamed aluminum floors. These panels cannot simultaneously meet the requirements of rail vehicle interior floors for supporting and bearing capacity, lightweight and sound insulation.

[0004] Therefore, how to solve the problem that the panels in the related art cannot simultaneously meet the requirements of the interior floor of rail vehicles for supporting load-bearing capacity, lightweight and sound insulation has become an important technical problem to be solved by technical personnel in this field. Summary of the invention

[0005] The embodiments of the present invention provide a sandwich panel, a vehicle body and a rail vehicle, so as to solve the defect that the panels in the related art cannot simultaneously meet the requirements of the interior floor of the rail vehicle for supporting load-bearing capacity, lightweight and sound insulation effect, and improve the supporting load-bearing capacity and sound insulation effect of the lightweight panels.

[0006] The present invention provides a sandwich panel, comprising: At least two layers of panels; The core layer is arranged between two adjacent layers of the panels, the core layer is fixedly connected to the panels, at least two cavities are formed on both sides of the core layer, each of the cavities is distributed along a first direction, any two of the cavities are independent of each other, the cavities swing and extend along a second direction, the first direction and the second direction are both parallel to the panels, and the first direction is perpendicular to the second direction.

[0007] In this way, the arrangement of the core layer and the cavity not only conforms to the lightweight design, but also increases the overall structural rigidity of the sandwich panel and improves the bearing capacity. The cavity is in the shape of a swing curve, and any two cavities are independent of each other, which reduces the direct transmission path of the sound wave, increases the difficulty of sound wave propagation and the energy absorbed by the side wall of the cavity when the sound wave is reflected, and effectively reduces the ability of the sound wave to propagate from one side of the sandwich panel to the other side, thereby improving the sound insulation effect of the sandwich panel. The sandwich panel provided by the present invention conforms to the lightweight design, and can have strong supporting bearing capacity and sound insulation effect at the same time. The sandwich panel provided by the present invention is applied to the interior floor of a rail vehicle, which can simultaneously meet the requirements of the interior floor of a rail vehicle for supporting bearing capacity, lightweight and sound insulation effect, and solves the problem that the plate material in the related art cannot simultaneously meet the requirements of the interior floor of a rail vehicle for supporting bearing capacity, lightweight and sound insulation effect.

[0008] According to a sandwich panel provided by the present invention, the cavity comprises at least two sections of sub-cavities, the extension direction of the sub-cavities is set at an angle to the first direction, the extension direction of the sub-cavities is set at an angle to the second direction, each section of the sub-cavities is distributed along the second direction, and any two adjacent sections of the sub-cavities are connected.

[0009] In this way, the cavity is a continuous cavity, and the projection of the cavity on the panel is a wavy line, which can increase the number of reflections of sound waves, form a complex sound field distribution, and reduce direct sound.

[0010] According to a sandwich panel provided by the present invention, the side wall of the cavity is arranged obliquely relative to the panel.

[0011] This arrangement can utilize the inclined reflection to form a sound barrier and a micro-reverberation chamber to improve the sound insulation. It can also increase the number of reflections of sound waves, form a complex sound field distribution, reduce direct sound, and increase reverberation time. The core layer has folds and bending ribs in three-dimensional space and has excellent supporting performance. The core layer is combined and fixed with the panel to form a more stable sandwich structure, which can greatly improve the bearing capacity of the sandwich panel.

[0012] According to a sandwich panel provided by the present invention, the extension length of each section of the sub-cavity, the angle between the extension directions of two adjacent sections of the sub-cavity, and the angle between the side wall of the cavity and the panel are all determined according to the target bearing capacity and target sound insulation performance of the sandwich panel.

[0013] In this way, the geometric parameters of the cavity are related to the supporting load-bearing capacity and sound insulation effect of the sandwich panel. The geometric parameters of the cavity affect both the sound insulation effect and the structural strength of the sandwich panel. By optimizing the geometric parameters of the cavity, the lightweight, supporting load-bearing capacity and sound insulation effect of the sandwich panel can be better balanced.

[0014] According to a sandwich panel provided by the present invention, the material of the core layer is aluminum foil, and the core layer is formed by a rolling and folding process.

[0015] In this way, the aluminum foil has the advantage of being light in weight, which can further reduce the weight of the sandwich panel and promote the lightweight design of the sandwich panel. The rolling folding process realizes continuous production, is highly efficient, and has low processing costs. Moreover, the processed core layer has structural continuity and high structural rigidity and strength.

[0016] According to a sandwich panel provided by the present invention, the material of the core layer is carbon fiber or glass fiber, and the core layer is formed by mold processing.

[0017] In this way, the carbon fiber and glass fiber are high-performance composite materials with the advantages of high strength and high modulus, and low density, which can further reduce the mass of the sandwich panel.

[0018] According to a sandwich panel provided by the present invention, the cavity is filled with a target filler, and the target filler includes at least one of a fireproof material, a sound absorbing material and a heat insulating material.

[0019] Such an arrangement can further improve the sound insulation effect of the sandwich panel, or expand the performance of the sandwich panel so that the sandwich panel has fireproof and heat insulation properties.

[0020] According to a sandwich panel provided by the present invention, the core layer is fixed to the face plate by bonding, or the core layer is fixed to the face plate by welding.

[0021] With this arrangement, the connecting plane between two adjacent cavities is bonded and fixed to the panel, and the connecting plane is sealed to the panel, which can ensure the mutual independence of the two adjacent cavities and the connection strength between the core layer and the panel, thereby improving the structural stability of the sandwich panel.

[0022] The present invention also provides a vehicle body, an interior floor and an interior roof, wherein at least one of the interior floor and the interior roof is formed by processing using the sandwich panel as described above.

[0023] The present invention also provides a rail vehicle, comprising the sandwich panel or the vehicle body.

[0024] The sandwich panel provided by the present invention includes a panel and a core layer, wherein the panel is provided with at least two layers, the core layer is provided between two adjacent layers of the panel, and the core layer is fixedly connected to the panel. The provision of the core layer can increase the overall structural rigidity of the sandwich panel and improve the bearing capacity. At least two cavities are formed on both sides of the core layer, and each cavity is distributed along a first direction. The provision of the cavity reduces the mass of the core layer and the sandwich panel, and conforms to a lightweight design. The cavity swings and extends along a second direction, and both the first direction and the second direction are parallel to the panel, and the first direction is perpendicular to the second direction. The cavity is in the shape of a swinging curve, and any two cavities are independent of each other, which can reduce the direct transmission path of the sound wave, increase the difficulty of sound wave propagation, and increase the number of reflections of the sound wave in the cavity. The side wall of the cavity can absorb part of the energy when reflecting the sound wave, which can effectively reduce the propagation ability of the sound wave from one side of the sandwich panel to the other side, thereby improving the sound insulation effect of the sandwich panel. With such arrangement, the sandwich panel provided by the present invention complies with the lightweight design and can simultaneously have strong supporting load-bearing capacity and sound insulation effect. The sandwich panel provided by the present invention is applied to the interior floor of a rail vehicle, which can simultaneously meet the requirements of the interior floor of a rail vehicle for supporting load-bearing capacity, lightweight and sound insulation effect, thereby solving the problem that the panels in the related art cannot simultaneously meet the requirements of the interior floor of a rail vehicle for supporting load-bearing capacity, lightweight and sound insulation effect.

[0025] Furthermore, in the vehicle body provided by the present invention, since it is provided with the sandwich panel as described above, it also has the various advantages as described above.

[0026] Furthermore, in the rail vehicle provided by the present invention, since it is provided with the sandwich panel or the vehicle body as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the sandwich panel provided by the present invention (part of the panel is cut away).

[0029] Figure 2 This is a view of the core layer provided by the present invention along the thickness direction of the panel.

[0030] Figure 3 It is a cross-sectional view of the core layer provided by the present invention (the cutting plane is parallel to the panel).

[0031] Figure 4It is a schematic diagram of the end structure of the sandwich panel provided by the present invention.

[0032] Figure 5 It is a schematic diagram of the reflection process of the sound wave in the cavity provided by the present invention.

[0033] Figure 6 It is a schematic diagram of geometric parameters of the core layer provided by the present invention.

[0034] Reference numerals: 1. Panel; 2. Core layer; 3. Cavity; 4. Sub-cavity; 5. Connection plane. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0038] Combine the following Figures 1 to 6 The sandwich panel of the invention is described.

[0039] like Figures 1 to 6 As shown, the sandwich panel provided by the embodiment of the present invention includes a panel 1 and a core layer 2.

[0040] Specifically, the panel 1 is provided with at least two layers, the core layer 2 is provided between two adjacent layers of the panel 1, and the core layer 2 and the panel 1 are fixedly connected together to form a sandwich panel in the form of a "sandwich" structure.

[0041] In some embodiments, only two layers of face panels 1 are provided, and the core layer 2 is provided between the two layers of face panels 1 , so that the sandwich panel has a three-layer structure.

[0042] In other embodiments, three or more layers of panels 1 are provided, each layer of the panels 1 is parallel to each other, a core layer 2 is provided between any two adjacent layers of the panels 1, each layer of the panels 1 is fixedly connected to the core layer 2, and the sandwich panel has a multi-layer structure.

[0043] The core layer 2 is fixedly connected to the panel 1 to form an integrated structure. The arrangement of the core layer 2 can increase the structural rigidity and strength of the sandwich panel as a whole and improve the supporting bearing capacity.

[0044] At least two cavities 3 are formed on both sides of the core layer 2, and each cavity 3 is distributed along the first direction. The arrangement of the cavity 3 reduces the mass of the core layer 2 and the sandwich panel, which conforms to the lightweight design.

[0045] The cavity 3 swings and extends along the second direction. Both the first direction and the second direction are parallel to the panel 1 , and the first direction is perpendicular to the second direction. Figures 1 to 3 The direction indicated by x is the first direction, and the second direction is Figures 1 to 3 The direction indicated by y.

[0046] The cavity 3 is in the shape of a swing curve, which can reduce the direct transmission path of the sound wave, increase the difficulty of sound wave propagation, and increase the number of reflections of the sound wave in the cavity 3. The side wall of the cavity 3 can absorb part of the energy when reflecting the sound wave, which can effectively reduce the propagation ability of the sound wave from one side to the other side of the sandwich panel, thereby improving the sound insulation effect of the sandwich panel.

[0047] Moreover, any two cavities 3 are independent of each other, which can prevent the propagation of sound waves between different cavities 3 and further improve the sound insulation effect of the sandwich panel.

[0048] With such arrangement, the sandwich panel provided in the embodiment of the present invention complies with the lightweight design and can simultaneously have strong supporting load-bearing capacity and sound insulation effect. The sandwich panel provided in the embodiment of the present invention is applied to the interior floor of a rail vehicle, which can simultaneously meet the requirements of the interior floor of a rail vehicle for supporting load-bearing capacity, lightweight and sound insulation effect, thereby solving the problem that the plate materials in the related art cannot simultaneously meet the requirements of the interior floor of a rail vehicle for supporting load-bearing capacity, lightweight and sound insulation effect.

[0049] In the embodiment of the present invention, the cavity 3 includes at least two sub-cavities 4, the extension direction of the sub-cavity 4 is set at an angle to the first direction, and the extension direction of the sub-cavity 4 is set at an angle to the second direction. The sub-cavity 4 can extend along a straight line or a curve, as long as the extension direction of the sub-cavity 4 is not parallel to the first direction and the second direction.

[0050] The node cavities 4 are distributed along the second direction, and any two adjacent node cavities 4 are connected, the node cavities 4 are connected in series to form a continuous cavity, and the projection of the cavity 3 on the panel 1 is in a wavy line shape.

[0051] The node cavities 4 are smoothly connected, which can disperse external forces, reduce stress concentration points, and improve the mechanical properties of the core layer 2.

[0052] In this embodiment, the side wall of the cavity 3 is inclined relative to the panel 1. Figure 1 , Figure 5 and Figure 6 .

[0053] The side wall of the cavity 3 is inclined relative to the panel 1, and the inclined reflection can be used to form a sound barrier and a micro-reverberation chamber to improve the sound insulation. It can also increase the number of reflections of sound waves, form a complex sound field distribution, reduce direct sound, and increase reverberation time.

[0054] The core layer 2 has folds and bending ribs in three-dimensional space and has excellent supporting performance. The core layer 2 is combined and fixed with the panel 1 to form a more stable sandwich structure, which can greatly improve the supporting and bearing capacity of the sandwich panel.

[0055] It should be noted that there is a spacing between two adjacent cavities 3, and a connecting plane 5 is formed between the two adjacent cavities 3 to avoid stress concentration, and when the core layer 2 and the panel 1 are connected together, the connecting plane 5 between the two adjacent cavities 3 overlaps and contacts the panel 1, which can improve the connection strength between the core layer 2 and the panel 1.

[0056] The side wall of the cavity 3 may be a plane, and accordingly, the cross-sectional shape of the cavity 3 along the first direction and the thickness direction of the panel 1 may be a triangle or a trapezoid. The side wall of the cavity 3 may also be a curved surface, and accordingly, the cross-sectional shape of the core layer 2 along the first direction and the thickness direction of the panel 1 may be a sine curve.

[0057] In this embodiment, the geometric parameters of the cavity 3 include the extension length of each section of the sub-cavity 4, the angle between the extension directions of two adjacent sections of the sub-cavity 4, and the angle between the side wall of the cavity 3 and the panel 1. The extension length of each section of the sub-cavity 4 is referred to as Figure 6 The length indicated by m in the figure is the angle between the extension directions of two adjacent sections of the cavity 4. Figure 6 The angle indicated by θ in the figure is the angle between the side wall of the cavity 3 and the panel 1. Figure 6 The angle indicated by β.

[0058] The geometric parameters of cavity 3 are related to the load-bearing capacity and sound insulation effect of the sandwich panel. The geometric parameters of cavity 3 affect both the sound insulation effect of the sandwich panel and the structural strength and support load-bearing capacity of the sandwich panel. By optimizing the geometric parameters of cavity 3, the lightweight, support load-bearing capacity and sound insulation effect of the sandwich panel can be better balanced.

[0059] In the specific implementation process, the above geometric parameters can be determined according to the target bearing capacity and target sound insulation performance of the sandwich panel. The bearing capacity and sound insulation performance of the sandwich panel are verified through simulation analysis or experimental testing, and the optimal geometric parameters are determined through repeated adjustment and verification of the above geometric parameters to ensure that the target bearing capacity and target sound insulation performance of the sandwich panel meet the requirements.

[0060] In this embodiment, the extension length of each sub-cavity 4 is less than or equal to 15 mm, the angle between the extension directions of two adjacent sub-cavities 4 is less than 100 degrees, and the angle between the side wall of the cavity 3 and the panel 1 is in the range of 60-70 degrees.

[0061] In some embodiments, metal material may be selected to process the core layer 2. Specifically, the material of the core layer 2 is aluminum foil, which has the advantage of being light in weight, and can further reduce the weight of the sandwich panel, thereby promoting the lightweight design of the sandwich panel.

[0062] The core layer 2 can be formed by rolling and folding the aluminum foil.

[0063] The rolling folding process mainly uses a series of rollers to gradually bend, fold and press the aluminum foil, and finally forms a product of a specific shape, realizing continuous production, high efficiency and low processing cost. Moreover, the processed core layer 2 has structural continuity and high structural rigidity and strength.

[0064] In other embodiments, non-metallic materials are used to process the core layer 2. Specifically, the core layer 2 is made of carbon fiber or glass fiber, which are high-performance composite materials with the advantages of high strength and high modulus, and low density, which can further reduce the quality of the sandwich panel.

[0065] The core layer 2 can be formed by processing a mold. Specifically, the mold includes a first mold body and a second mold body, and the first mold body and the second mold body are combined to form a mold cavity with a shape consistent with the shape of the core layer 2. Carbon fibers are placed in the mold cavity, and liquid resin is filled into the mold cavity to fully infiltrate the carbon fiber reinforced material. After the resin is cured, the mold is removed to obtain the core layer 2.

[0066] Accordingly, in this embodiment, a metal plate such as an aluminum plate may be selected to form the panel 1 , or a non-metal plate such as a carbon fiber plate or a glass fiber plate may be selected to form the panel 1 .

[0067] In a further embodiment, according to the performance requirements of the sandwich panel, a target filler can be filled in the cavity 3. The target filler includes at least one of a fireproof material, a sound absorbing material and a heat insulating material.

[0068] For sandwich panels with extremely high sound insulation requirements, sound-absorbing materials can be selected as the above-mentioned target filler. After the sound-absorbing material is filled in the cavity 3, the core layer 2 can not only reflect the sound waves multiple times and absorb the energy of the sound waves, but the sound-absorbing material can also absorb the energy of the sound waves at the same time, which can greatly improve the sound insulation performance of the sandwich panel.

[0069] For sandwich panels with requirements for fireproof performance, fireproof materials can be selected as the above-mentioned target filler. After the fireproof material is filled in the cavity 3, the core layer 2 not only has excellent sound insulation performance, load-bearing capacity, and light weight, but also has fireproof performance, and the performance of the sandwich panel is expanded.

[0070] For sandwich panels with requirements for thermal insulation performance, thermal insulation materials can be selected as the above-mentioned target filler. After the thermal insulation material is filled in the cavity 3, the core layer 2 not only has excellent sound insulation performance, load-bearing capacity, and light weight, but also has thermal insulation performance, and the performance of the sandwich panel is expanded.

[0071] It should be noted that the target material can be filled in the cavity 3 of the sandwich panel according to the requirements. When the sandwich panel needs to have more performance extensions, different materials can be filled in the cavity 3 of the sandwich panel at the same time. For example, for a sandwich panel that has requirements for sound insulation performance, load-bearing capacity, fire resistance performance, and heat insulation performance, a portion of the cavity 3 can be filled with fireproof material, and a portion of the cavity 3 can be filled with heat insulation material, and the cavity 3 filled with fireproof material and the cavity 3 filled with heat insulation material are distributed alternately.

[0072] The target filler can be filled in the cavity 3 of the core layer 2 before the core layer 2 and the panel 1 are fixedly connected together, and then the core layer 2 and the panel 1 are fixedly connected together. Alternatively, the core layer 2 and the panel 1 can be fixedly connected together first, and then the target filler can be filled in the cavity 3 between the core layer 2 and the panel 1.

[0073] The filling of the above-mentioned target filler can be achieved through a foaming process.

[0074] Each cavity 3 in this embodiment is a continuous cavity along the second direction. The cavity 3 has a large volume and is convenient for filling with the target filler, which is beneficial to improving the filling efficiency of the target filler.

[0075] In this embodiment, the core layer 2 can be bonded and fixed to the panel 1. Specifically, a film can be applied to the side of the panel 1 facing the core layer 2, the core layer 2 and the panel 1 can be stacked, and a pressing force can be applied to the panel 1 to press and fix the panel 1 and the core layer 2 together to ensure the bonding quality. The connecting plane 5 between two adjacent cavities 3 is bonded and fixed to the panel 1, and the connecting plane 5 is sealed and connected to the panel 1, which can ensure the mutual independence of the two adjacent cavities 3.

[0076] The core layer 2 and the panel 1 can also be fixed by welding. Fixing the core layer 2 and the panel 1 together by welding can not only achieve a sealed connection between the connecting plane 5 and the panel 1, ensure the mutual independence of the two adjacent cavities 3, but also ensure the connection strength between the core layer 2 and the panel 1, thereby improving the structural stability of the sandwich panel.

[0077] On the other hand, an embodiment of the present invention further provides a vehicle body, including an interior floor and an interior roof, at least one of the interior floor and the interior roof is formed by processing the sandwich panel provided by any of the above embodiments. The sandwich panel provided by any of the above embodiments conforms to the lightweight design and has excellent supporting load-bearing capacity and sound insulation effect. The vehicle body in this embodiment conforms to the lightweight design, has excellent reliability and safety, low noise, and comfortable ride. The derivation process of the beneficial effects of the vehicle body in the embodiment of the present invention is generally similar to the derivation process of the beneficial effects of the above sandwich panels, so it will not be repeated here.

[0078] In another aspect, an embodiment of the present invention further provides a rail vehicle, comprising the sandwich panel or vehicle body provided by any of the above embodiments, which has all the advantages of the above sandwich panel or vehicle body and will not be described in detail here.

[0079] The derivation process of the beneficial effects of the rail vehicle in the embodiment of the present invention is generally similar to the derivation process of the beneficial effects of the sandwich panel or the vehicle body described above, so it will not be repeated here.

[0080] The rail vehicle provided in the embodiment of the present invention may be a high-speed train, a motor train, an urban train, etc.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sandwich panel, characterized in that: include: At least two panels (1); A core layer (2) is arranged between two adjacent layers of the panel (1); the core layer (2) is fixedly connected to the panel (1); at least two cavities (3) are formed on both sides of the core layer (2); each cavity (3) is distributed along a first direction; any two cavities (3) are independent of each other; the cavity (3) swings and extends along a second direction; the first direction and the second direction are both parallel to the panel (1), and the first direction is perpendicular to the second direction.

2. The sandwich panel according to claim 1, characterized in that: The cavity (3) comprises at least two sections of sub-cavities (4); the extension direction of the sub-cavities (4) is arranged at an angle to the first direction; the extension direction of the sub-cavities (4) is arranged at an angle to the second direction; each section of the sub-cavities (4) is distributed along the second direction, and any two adjacent sections of the sub-cavities (4) are connected.

3. The sandwich panel according to claim 2, characterized in that: The side wall of the cavity (3) is arranged to be inclined relative to the panel (1).

4. The sandwich panel according to claim 3, characterized in that: The extension length of each section of the sub-cavity (4), the angle between the extension directions of two adjacent sections of the sub-cavity (4), and the angle between the side wall of the cavity (3) and the panel (1) are all determined according to the target bearing capacity and target sound insulation performance of the sandwich panel.

5. The sandwich panel according to any one of claims 1 to 4, characterized in that: The material of the core layer (2) is aluminum foil, and the core layer (2) is formed by a rolling and folding process.

6. The sandwich panel according to any one of claims 1 to 4, characterized in that: The material of the core layer (2) is carbon fiber or glass fiber, and the core layer (2) is formed by mold processing.

7. The sandwich panel according to any one of claims 1 to 4, characterized in that: The cavity (3) is filled with a target filler, and the target filler comprises at least one of a fireproof material, a sound-absorbing material and a heat-insulating material.

8. The sandwich panel according to any one of claims 1 to 4, characterized in that: The core layer (2) is bonded and fixed to the panel (1), or the core layer (2) is welded and fixed to the panel (1).

9. A vehicle body, characterized in that: The utility model comprises an interior floor and an interior ceiling, wherein at least one of the interior floor and the interior ceiling is formed by processing the sandwich panel according to any one of claims 1 to 8.

10. A rail vehicle, characterized in that: The method comprises a sandwich panel as claimed in any one of claims 1 to 8, or a vehicle body as claimed in claim 9.

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