Rail transit vehicle roof sandwich panel and embedded part composite connection structure and process thereof

Abstract

The application discloses a roof sandwich panel and embedded part composite connection structure for rail transit vehicles and a process thereof, and relates to the technical field of mechanical connection structures. The roof sandwich panel and embedded part composite connection structure comprises a multilayer composite panel, an embedded metal profile, a framework side beam and a mechanical locking unit. The multilayer composite panel is composed of an upper panel, a lower panel and a lightweight core material. The embedded metal profile is installed on the edge of the panel through a glue joint layer. The framework side beam is sleeved on the panel through a clamping groove and is glued to the upper panel and the lower panel. The mechanical locking unit mechanically connects and fixes the three. The composite connection structure of glue jointing and mechanical locking not only guarantees the connection strength of the roof sandwich panel and the embedded part, but also improves the reliability and durability of the connection, thereby meeting the comprehensive requirements of high reliability, high durability and light weight of the roof structure of the rail transit vehicles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical connection structures, and in particular to a composite connection structure of a roof sandwich panel and a pre-embedded part for a rail transit vehicle and a process thereof. BACKGROUND

[0002] With the increasing demand for light weight of rail transit vehicles, it has become a mainstream technical trend in the industry to use a sandwich panel composed of an upper panel, a lower panel and an intermediate lightweight core material as the main body of the roof cover panel. Such composite material structure can effectively reduce the weight of the vehicle body, but at the same time, it also poses new challenges to the reliable connection between it and the vehicle body framework.

[0003] Currently, in order to realize the connection of the sandwich panel and the metal framework, the existing technology usually adopts the method of pre-embedding a metal profile at the edge of the sandwich panel as a transition connecting piece. The traditional connection methods mainly include two types:

[0004] One is a simple mechanical connection, for example, a riveting method is used to fix the pre-embedded profile and the framework side beam. Although this method has high connection strength and fast curing, it will cause significant stress concentration at the connection point, resulting in excessive stress of the panel of the sandwich panel, especially in the panel hole edge area, which is prone to cause panel damage or fatigue failure under long-term use, affecting the durability of the overall structure.

[0005] The second is a simple adhesive connection, that is, the pre-embedded profile is bonded with the sandwich panel and the framework as a whole by using an adhesive. This method has relatively balanced stress and can avoid serious stress concentration, but its reliability is highly dependent on the performance of the adhesive layer, and the adhesive layer itself will become a weak link under stress. When subjected to peeling force or dynamic load, the adhesive layer stress is large, and there is a risk of adhesive layer failure, and the reliability and durability of the connection cannot be guaranteed.

[0006] Therefore, there is an urgent need in the art for a connection scheme that can balance high bearing capacity, excellent fatigue durability and high reliability, in order to solve the inherent defects of traditional single connection methods. SUMMARY

[0007] In view of the problems existing in the prior art, the present application provides a composite connection structure of a roof sandwich panel and a pre-embedded part for a rail transit vehicle and a process thereof.

[0008] In a first aspect, the present application provides a composite connection structure of a roof sandwich panel and a pre-embedded part for a rail transit vehicle, which adopts the following technical solution:

[0009] A roof sandwich panel and embedded part composite connection structure for rail transit vehicles, comprising a multilayer composite panel composed of an upper panel, a lower panel, and a lightweight core material arranged between the upper panel and the lower panel; an embedded metal profile installed at the edge position of the multilayer composite panel and located between the upper panel and the lower panel, wherein a glue layer is arranged between the embedded metal profile and the upper panel, the lower panel, and the lightweight core material of the multilayer composite panel; a skeleton side beam provided with a clamping groove, wherein the clamping groove is adapted to the multilayer composite panel, the skeleton side beam is sleeved on the multilayer composite panel through the clamping groove, the embedded metal profile is located in the clamping groove of the skeleton side beam, and a glue layer is arranged between the skeleton side beam and the upper panel and the lower panel of the multilayer composite panel; and a mechanical locking unit for mechanically connecting the skeleton side beam, the embedded metal profile, and the upper panel.

[0010] Optionally, an upper side wall of the embedded metal profile is provided with a slope section gradually approaching a lower side wall of the embedded metal profile in a direction away from the lightweight core material, and the upper panel is provided with an inclined surface matched with the slope section of the embedded metal profile.

[0011] Optionally, the upper panel and the lower panel are each provided with a clamping tooth at an end away from each other, and a side wall of the clamping groove is provided with a plurality of clamping grooves for inserting the clamping tooth.

[0012] Optionally, a cross section of the clamping tooth is trapezoidal, and a side wall of the clamping tooth near the edge position of the multilayer composite panel is arranged obliquely.

[0013] Optionally, an opening end of the clamping groove is provided with a guide slope for guiding the multilayer composite panel into the clamping groove.

[0014] Optionally, a stress dispersion layer is embedded in the glue layer, and an elastic modulus of the stress dispersion layer is lower than that of a main adhesive of the glue layer.

[0015] Optionally, a heat insulation cavity is arranged in the embedded metal profile.

[0016] Optionally, the mechanical locking unit comprises an anchor bolt and a threaded bushing, the anchor bolt is adapted to the threaded bushing, a first through hole is formed in the skeleton side beam and communicated with the clamping groove, a second through hole is formed in the upper panel of the multilayer composite panel, a third through hole is formed in a top end of the embedded metal profile, positions of the first through hole, the second through hole, and the third through hole correspond to each other, the threaded bushing is arranged in the first through hole, the second through hole, and the third through hole, a plurality of deformed clamping blocks are arranged at a bottom end of the threaded bushing, the deformed clamping blocks are distributed along a circumferential direction of the threaded bushing, and the deformed clamping blocks gradually approach each other in a direction away from the threaded bushing, and each deformed clamping block is provided with a clamping portion at an end away from each other, for clamping on an inner wall of the heat insulation cavity.

[0017] Optionally, the outer part of the threaded bushing is further sleeved with an elastic rubber sleeve.

[0018] In a second aspect, the application provides a processing technology of a roof sandwich panel and embedded part composite connection structure for rail transit vehicles, which adopts the following technical scheme:

[0019] A processing technology of a roof sandwich panel and embedded part composite connection structure for rail transit vehicles, which comprises the following steps:

[0020] S1, providing a multi-layer composite panel composed of an upper panel, a lower panel and a lightweight core material, and leaving a slot position for accommodating the embedded metal profile at the edge thereof;

[0021] S2, coating adhesive on the connecting surfaces of the embedded metal profile and the upper panel, the lower panel and the lightweight core material, then embedding the embedded metal profile into the slot position reserved in the multi-layer composite panel, so that the adhesive between the upper panel, the lower panel, the lightweight core material and the embedded metal profile is preliminarily cured and a glued layer is formed;

[0022] S3, determining the installation position of the framework edge beam, and coating adhesive on the corresponding positions of the upper panel and the lower panel, the framework edge beam being sleeved on the edge position of the multi-layer composite panel through the clamping groove, and the framework edge beam being connected with the upper panel and the lower panel through the adhesive to form a glued layer;

[0023] S4, mechanically connecting and fixing the framework edge beam, the embedded metal profile and the upper panel through the mechanical lock unit, and finally curing the overall structure to form a composite connection structure.

[0024] In summary, the application has at least one of the following beneficial technical effects:

[0025] 1.The composite connection structure of the application through bonding + mechanical locking not only ensures the connection strength of the roof sandwich panel and the embedded part, but also improves the reliability and durability of the connection, meeting the comprehensive requirements of rail transit vehicles for high reliability, high durability and lightweight of the roof structure. Specifically, by bonding the upper panel, lower panel and lightweight core material of the multi-layer composite panel to the embedded metal profile through the bonding layer, the connection firmness is ensured, and the bonding layer can realize uniform load transmission to avoid stress concentration. By setting the framework side beam, and the framework side beam is clamped at the edge position of the multi-layer composite panel through the clamping groove, the upper panel and the lower panel of the multi-layer composite panel are also bonded and fixed to the framework side beam through the bonding layer, so that the framework side beam is stably installed at the edge position of the multi-layer composite panel; and the clamping groove can provide longitudinal compression force to the bonding layer to ensure the connection firmness of the bonding layer and reduce the risk of cracking of the bonding layer. The framework side beam, the embedded metal profile and the upper panel are mechanically fixed by the mechanical locking unit, further improving the connection strength, and the stress at the connection of the mechanical locking unit will mostly act on the framework side beam and the embedded metal profile, rather than directly on the upper panel of the multi-layer composite panel, reducing the risk of damage or fatigue failure of the upper panel and improving the durability of the overall structure of the sandwich panel.

[0026] 2.The application realizes the wedge-shaped cooperation between the embedded metal profile and the upper panel by setting the slope section at the top of the embedded metal profile cooperating with the inclined surface structure of the upper panel. This structure can generate pre-tightening force during assembly, so that the bonding layer is in a compressed state before curing, improving the bonding strength of the bonding interface. At the same time, the wedge-shaped structure cooperates with the framework side beam set at the edge position of the multi-layer composite panel, which can effectively prevent the embedded metal profile from being separated from the sandwich layer at the edge of the multi-layer composite panel due to external load during use.

[0027] 3.The application can effectively absorb and disperse the stress concentration at the connection part by embedding a stress dispersion layer with lower elastic modulus in the bonding layer. Especially under the action of dynamic load or thermal stress caused by temperature change, the stress dispersion layer can play a buffering role, reducing the stress peak of the glue layer and the panel, and improving the fatigue life of the connection structure. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is the overall structure schematic diagram of the embodiment of the application;

[0029] Figure 2 is the structure schematic diagram of the mechanical locking unit used in the embodiment of the application.

[0030] Explanation of reference signs: 1, multi-layer composite board; 11, upper panel; 12, lower panel; 13, light core material; 14, clamping tooth; 15, second through hole; 2, embedded metal profile; 21, slope section; 22, heat insulation cavity; 23, third through hole; 3, framework side beam; 31, clamping groove; 32, clamping groove; 33, first through hole; 4, mechanical locking unit; 41, anchor bolt; 42, threaded bushing; 43, deformed clamping block; 431, clamping part; 44, elastic rubber sleeve; 5, adhesive layer; 51, stress dispersion layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 2 The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] The present application mainly adopts composite connection of gluing + mechanical locking, taking into account strength and reliability, and achieves the effect of improving the reliability, durability and load-bearing capacity of the connection between the roof sandwich panel and the embedded part of the rail transit vehicle. The present application will be described in further detail as follows:

[0033] The present application discloses a composite connection structure of a roof sandwich panel and an embedded part for a rail transit vehicle. Referring to Figure 1 , it comprises a multi-layer composite board 1, an embedded metal profile 2, a framework side beam 3 and a mechanical locking unit 4. The multi-layer composite board 1 is composed of an upper panel 11, a lower panel 12 and a light core material 13 arranged between the upper panel 11 and the lower panel 12. The embedded metal profile 2 is installed at the edge position of the multi-layer composite board 1 and located between the upper and lower panels 12, and the adhesive layer 5 is arranged between the embedded metal profile 2 and the upper panel 11, the lower panel 12 and the light core material 13, which ensures the stable connection between the embedded metal profile 2 and the multi-layer composite board 1. The framework side beam 3 is sleeved on the multi-layer composite board 1 through the clamping groove 31, and there is also an adhesive layer 5 between the framework side beam 3 and the upper panel 11 and the lower panel 12 of the multi-layer composite board 1, which further enhances the connection stability. The mechanical locking unit 4 mechanically connects the framework side beam 3, the embedded metal profile 2 and the upper panel 11, tightly combining them together, which achieves the effect of improving the connection strength, reliability and durability of the roof sandwich panel and the embedded part. The specific reason is that the adhesive layer 5 can uniformly transmit the load and avoid stress concentration, and the mechanical locking unit 4 further strengthens the connection and disperses the stress to the framework side beam 3 and the embedded metal profile 2, reducing the damage to the upper panel 11.

[0034] Referring to Figure 1In particular, the upper panel 11 and the lower panel 12 of the multi-layer composite panel 1 are generally made of high-strength and lightweight metal materials, such as aluminum alloy. Aluminum alloy has the advantages of light weight, moderate strength, corrosion resistance, etc. Of course, carbon fiber composite materials and the like can also be used. These materials can not only ensure a certain strength, but also meet the lightweight requirements of vehicles. The lightweight core material 13 can be selected from foamed plastic or honeycomb structural material. Foamed plastic has good sound insulation and heat insulation performance, and honeycomb structural material has high specific strength. The upper panel 11 and the lower panel 12 are arranged in parallel, and the lightweight core material 13 is filled therebetween to form a sandwich structure. This structure not only ensures the strength, but also reduces the weight.

[0035] With reference to Figure 1 In particular, the embedded metal profile 2 is generally made of steel or stainless steel, which has high strength and good toughness. The upper side wall of the embedded metal profile 2 is provided with a slope section 21, which gradually approaches the lower side wall of the embedded metal profile 2 in a direction away from the lightweight core material 13. The upper panel 11 is provided with a slope surface which is fitted therewith. Such a wedge-shaped fitting structure can generate a pre-tightening force during assembly, so that the glue joint layer 5 is in a compressed state before curing, thereby improving the bonding strength of the glue joint interface. At the same time, the framework edge beam 3 which is sleeved at the edge position of the multi-layer composite panel 1 can effectively prevent the embedded metal profile 2 from being separated from the sandwich layer of the multi-layer composite panel 1 due to external load during use.

[0036] With reference to Figure 1 In particular, the framework edge beam 3 is generally made of profile steel which has high strength and rigidity. The clamping groove 31 provided on the framework edge beam 3 is adapted to the multi-layer composite panel 1. The opening end of the clamping groove 31 is provided with a guide slope. The guide slope serves to guide the multi-layer composite panel 1 into the clamping groove 31, facilitating installation and improving assembly efficiency. When the framework edge beam 3 is sleeved on the multi-layer composite panel 1 through the clamping groove 31, the clamping groove 31 plays a certain restraining role on the upper and lower panels 12 of the multi-layer composite panel 1. At the same time, the clamping groove 31 can provide longitudinal compression force to the glue joint layer 5, thereby ensuring the connection firmness of the glue joint layer 5 and reducing the risk of cracking of the glue joint layer 5.

[0037] With reference to Figure 1 In addition, the upper panel 11 and the lower panel 12 are each provided with a clamping tooth 14 at an end away from each other. The cross section of the clamping tooth 14 is trapezoidal, and the side wall close to the edge position of the multi-layer composite panel 1 is inclined. The side wall of the clamping groove 31 is provided with a plurality of clamping grooves 32 for inserting the clamping tooth 14. This structure can increase the stability of the connection. The cooperation of the trapezoidal clamping tooth 14 and the clamping groove 32 makes the multi-layer composite panel 1 and the framework edge beam 3 more closely combined. The inclined side wall facilitates the smooth insertion of the clamping tooth 14 into the clamping groove 32.

[0038] With reference to Figure 2In the adhesive layer 5, a stress dispersion layer 51 is embedded, the elastic modulus of the stress dispersion layer 51 is lower than that of the main adhesive of the adhesive layer 5, and the stress dispersion layer 51 can be made of rubber material, elastic fiber material or cotton and hemp material. This setting can effectively absorb and disperse the stress concentration of the connecting part, especially under the action of dynamic load or thermal stress caused by temperature change, the stress dispersion layer 51 can play a buffering role, reduce the stress peak of the adhesive layer and the panel, and improve the fatigue life of the connecting structure.

[0039] Referring to Figure 1 The embedded metal profile 2 is also provided with a heat insulation cavity 22. The heat insulation cavity 22 can effectively block the heat bridge effect, improve the heat insulation performance of the roof structure, play a heat insulation role, and at the same time, avoid the direct conduction of external heat through the embedded metal profile 2, thereby accelerating the aging of the adhesive layer 5. In addition, the heat insulation cavity 22 can also be filled with heat insulation materials such as glass wool.

[0040] Referring to Figure 2 Specifically, the mechanical lock unit 4 includes an anchor nail 41 and a threaded bushing 42, the anchor nail 41 is matched with the threaded bushing 42, and the threaded bushing 42 can be made of metal or plastic material. The skeleton side beam 3 is provided with a first through hole 33 communicated with the clamping groove 31, the upper panel 11 of the multi-layer composite board 1 is provided with a second through hole 15, and the top end of the embedded metal profile 2 is provided with a third through hole 23. The positions of the first through hole 33, the second through hole 15 and the third through hole 23 correspond. The bottom end of the threaded bushing 42 is provided with a plurality of deformed clamping blocks 43, which can be made of plastic or elastic metal material and are welded on the threaded bushing 42 or integrally formed with the threaded bushing 42. Each deformed clamping block 43 is distributed along the circumference of the threaded bushing 42 and gradually approaches in the direction away from the threaded bushing 42. Each deformed clamping block 43 is provided with a clamping portion 431 at the end away from each other, which is used for clamping on the inner wall of the heat insulation cavity 22. During installation, the threaded bushing 42 is first inserted into the first through hole 33, the second through hole 15 and the third through hole 23, and then the anchor nail 41 is screwed with the threaded bushing 42. With the continuous tightening of the anchor nail 41, the anchor nail 41 extrudes each deformed clamping block 43 to make the deformed clamping block 43 bend and deform outward, and the clamping portion 431 is clamped on the inner wall of the heat insulation cavity 22, so as to realize mechanical connection.

[0041] Referring to Figure 2 In addition, the outer part of the threaded bushing 42 is also sleeved with an elastic rubber sleeve 44, which can play a buffering and sealing role, reduce the influence of vibration on the connection, prevent water and the like from entering the connecting part, and improve the reliability and durability of the connection. In addition, the setting of the elastic rubber sleeve 44 can also increase the structural stability of the threaded bushing 42 after being inserted into the first through hole 33, the second through hole 15 and the third through hole 23, and facilitate the installation of the anchor nail 41.

[0042] The implementation principle of the composite connection structure of the roof sandwich panel and the embedded part for the rail transit vehicle is as follows: the application combines the two modes of glue joint and mechanical locking, fully gives play to the advantages of the two modes, guarantees the connection strength of the roof sandwich panel and the embedded part, improves the reliability and durability of the connection, and meets the comprehensive requirements of the rail transit vehicle on the roof structure in high reliability, high durability and light weight. The upper panel 11, the lower panel 12 and the lightweight core material 13 of the multilayer composite panel 1 are all fixed by glue joint through the glue joint layer 5, the connection firmness is ensured, and the glue joint layer 5 can realize uniform load transmission and avoid stress concentration. The skeleton side beam 3 is arranged, the skeleton side beam 3 is clamped at the edge position of the multilayer composite panel 1 through the clamping groove 31, the upper panel 11 and the lower panel 12 of the multilayer composite panel 1 are also fixed by glue joint through the glue joint layer 5 and the skeleton side beam 3, the skeleton side beam 3 is stably installed at the edge position of the multilayer composite panel 1, and the clamping groove 31 can provide longitudinal compression force for the glue joint layer 5, so as to ensure the connection firmness of the glue joint layer 5 and reduce the risk of cracking of the glue joint layer 5. The skeleton side beam 3, the embedded metal profile 2 and the upper panel 11 are mechanically fixed through the mechanical locking unit 4, the connection strength is further improved, most of the stress at the connection position of the mechanical locking unit 4 acts on the skeleton side beam 3 and the embedded metal profile 2, and will not directly act on the upper panel 11 of the multilayer composite panel 1, thereby reducing the risk of damage or fatigue failure of the upper panel 11 and improving the durability of the overall structure of the sandwich panel.

[0043] The application also discloses a processing technology of a composite connection structure of a roof sandwich panel and an embedded part for a rail transit vehicle.

[0044] S1, a multilayer composite panel 1 composed of an upper panel 11, a lower panel 12 and a lightweight core material 13 is provided, and a groove position for accommodating an embedded metal profile 2 is left at the edge thereof. First, suitable upper panel 11, lower panel 12 and lightweight core material 13 materials are prepared, they are combined into a multilayer composite panel 1 through an assembly process, and then a groove position with a suitable size is accurately processed at the edge of the panel. The size of the groove position is matched with the embedded metal profile 2, so as to ensure the accuracy of subsequent installation.

[0045] S2, adhesive is coated on the connection surfaces of the embedded metal profile 2, the upper panel 11, the lower panel 12 and the lightweight core material 13, then the embedded metal profile 2 is embedded into the groove position reserved in the multilayer composite panel 1, the adhesive between the upper panel 11, the lower panel 12, the lightweight core material 13 and the embedded metal profile 2 is preliminarily solidified, and a glue joint layer 5 is formed. When the adhesive is coated, it is ensured that the coating is uniform and the thickness is moderate. It is important to select a suitable adhesive, which should have good adhesion and weather resistance. After the embedded metal profile 2 is embedded, a suitable pressing method such as clamp fixing can be used to make the adhesive fully fill the connection position and promote preliminary solidification.

[0046] S3, determine the installation position of the skeleton edge beam 3, and coat the adhesive on the corresponding position of the upper panel 11 and the lower panel 12, the skeleton edge beam 3 is sleeved on the edge position of the multi-layer composite board 1 through the clamping groove 31, and the skeleton edge beam 3 is connected with the upper panel 11 and the lower panel 12 through the adhesive to form the adhesive layer 5. When determining the installation position, the accuracy should be ensured, and the measuring tool can be used for positioning. After coating the adhesive, the skeleton edge beam 3 is smoothly sleeved on the multi-layer composite board 1 by using the guide slope of the clamping groove 31, and then a certain pressure is applied to make the adhesive work better.

[0047] S4, the skeleton edge beam 3, the embedded metal profile 2 and the upper panel 11 are mechanically connected and fixed through the mechanical lock unit 4, and the overall structure is finally cured to form a composite connection structure. First, the threaded bushing 42 is inserted into the corresponding through hole, then the anchor bolt 41 is installed, and the deformed clamping block 43 is clamped in the heat insulation cavity 22. Finally, the whole structure is placed in a suitable environment for final curing, and the temperature and time parameters should be controlled during the curing process to ensure the quality of the composite connection structure.

[0048] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A composite connection structure of roof sandwich panel and embedded parts for rail transit vehicles, characterized in that, include: The multi-layer composite board (1) is composed of an upper panel (11), a lower panel (12), and a lightweight core material (13) disposed between the upper panel (11) and the lower panel (12); An embedded metal profile (2) is installed at the edge of the multi-layer composite board (1) and located between the upper panel (11) and the lower panel (12). An adhesive layer (5) is provided between the embedded metal profile (2) and the upper panel (11), lower panel (12) and lightweight core material (13) of the multi-layer composite board (1). A frame side beam (3) is provided with a clamping groove (31), the clamping groove (31) is adapted to the multi-layer composite board (1), and the frame side beam (3) is sleeved on the multi-layer composite board (1) through the clamping groove (31). The embedded metal profile (2) is located in the clamping groove (31) of the frame side beam (3). An adhesive layer (5) is also provided between the frame side beam (3) and the upper panel (11) and lower panel (12) of the multi-layer composite board (1). Mechanical locking unit (4) is used to mechanically connect the frame side beam (3), the embedded metal profile (2) and the top panel (11); The upper sidewall of the embedded metal profile (2) is provided with a slope section (21), and the slope section (21) gradually approaches the lower sidewall of the embedded metal profile (2) in the direction away from the lightweight core material (13). The upper panel (11) is provided with a slope and fits against the slope section (21) of the embedded metal profile (2).

2. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 1, characterized in that: Both the upper panel (11) and the lower panel (12) are provided with locking teeth (14) at their ends that are far apart from each other, and the side wall of the clamping groove (31) is provided with a plurality of slots (32) for the locking teeth (14) to be inserted.

3. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 2, characterized in that: The cross-section of the tooth (14) is trapezoidal, and the side wall of the tooth (14) near the edge of the multilayer composite board (1) is inclined.

4. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 1, characterized in that: The opening end of the clamping groove (31) is provided with a guide slope for guiding the multi-layer composite board (1) into the clamping groove (31).

5. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 1, characterized in that: The adhesive layer (5) is embedded with a stress dispersion layer (51), and the elastic modulus of the stress dispersion layer (51) is lower than that of the main adhesive of the adhesive layer (5).

6. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 1, characterized in that: The embedded metal profile (2) is provided with a heat insulation cavity (22).

7. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 6, characterized in that: The mechanical locking unit (4) includes an anchor (41) and a threaded bushing (42). The anchor (41) is adapted to the threaded bushing (42). The frame side beam (3) has a first through hole (33) communicating with the clamping groove (31). The upper panel (11) of the multi-layer composite plate (1) has a second through hole (15). The top end of the pre-embedded metal profile (2) has a third through hole (23). The positions of the first through hole (33), the second through hole (15), and the third through hole (23) are corresponding. The threaded bushing (42) is used to be installed in the first through hole (33), the second through hole (15) and the third through hole (23). The bottom end of the threaded bushing (42) is provided with a plurality of deformable locking blocks (43). Each of the deformable locking blocks (43) is distributed along the circumference of the threaded bushing (42), and each of the deformable locking blocks (43) gradually approaches each other in the direction away from the threaded bushing (42). Each of the deformable locking blocks (43) is provided with a locking part (431) at the end away from each other, for locking onto the inner wall of the heat insulation cavity (22).

8. The composite connection structure of roof sandwich panel and embedded part for rail transit vehicles according to claim 7, characterized in that: The threaded bushing (42) is also fitted with an elastic rubber sleeve (44).

9. A processing technology for a composite connection structure of roof sandwich panel and embedded parts for rail transit vehicles as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Provide a multi-layer composite board (1) consisting of an upper panel (11), a lower panel (12) and a lightweight core material (13), and leave a groove at its edge to accommodate a pre-embedded metal profile (2); S2. Apply adhesive to the connection surfaces of the embedded metal profile (2) with the upper panel (11), lower panel (12) and lightweight core material (13), and then embed the embedded metal profile (2) into the pre-reserved slot of the multi-layer composite board (1) so that the adhesive between the upper panel (11), lower panel (12), lightweight core material (13) and the embedded metal profile (2) is initially cured and forms an adhesive layer (5). S3. Determine the installation position of the frame side beam (3) and apply adhesive to the corresponding positions of the upper panel (11) and the lower panel (12). The frame side beam (3) is fitted onto the edge of the multi-layer composite board (1) through the groove (31), and the frame side beam (3) is connected to the upper panel (11) and the lower panel (12) through adhesive to form an adhesive layer (5). S4. The skeleton side beam (3), the pre-embedded metal profile (2) and the upper panel (11) are mechanically connected and fixed by the mechanical locking unit (4), and the overall structure is finally cured to form a composite connection structure.

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