Lightweight high-strength composite material open-close cover for rail transit vehicle

Abstract

The utility model relates to rail transit technical field, concretely is a kind of light high-strength composite material opening and closing cover for rail transit vehicle, opening and closing cover includes main body structure a and main body structure b, the left side of main body structure a is equipped with thickening structure c, along the outside fixed connection flanging structure d of main body structure a and thickening structure c, the right upper side of main body structure a is fixedly provided with flanging structure e, the bottom side of main body structure a is fixedly connected flanging structure g, the left and right sides of main body structure a are equipped with bearing structure k, bearing structure k outside fixed connection flanging structure f, the top of main body structure a is fixedly provided with compression plate, the left and right sides of compression plate are equipped with bearing structure j, the both ends of main body structure b are fixedly connected with support respectively.The utility model carries out different layer design to key structure and non-load-bearing structure, improves mechanical product performance strength, reduces product weight, the process of vacuum bag compression molding is suitable for mass industrial production.

Description

Technical Field

[0001] This utility model relates to the field of rail transit technology, and in particular to a lightweight, high-strength composite material opening and closing cover for rail transit vehicles. Background Technology

[0002] In the rail transit sector, a head cover typically refers to an openable / closable enclosure structure at the front of a train, primarily used to protect front-end equipment, optimize aerodynamic performance, or facilitate maintenance. Currently, most head covers used on rail transit trains are manufactured using a hand lay-up molding process. This process produces products with high resin content, low fiber content, large fluctuations in interlayer bond strength, and high porosity, resulting in low mechanical properties and heavy weight. Prepreg, as a core intermediate material in composite materials, directly affects the mechanical properties and process stability of the composite material. Therefore, this invention proposes a lightweight, high-strength device solution through lay-up design and composite structure optimization to meet strength requirements and customer weight constraints. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a lightweight, high-strength composite material opening and closing cover for rail transit vehicles. The opening and closing cover includes a main structure a and a main structure b. A thickened structure c is provided on the left side of the main structure a. A flanged structure d is fixedly connected to the outer side of the main structure a and the thickened structure c. A flanged structure e is fixedly provided on the upper right side of the main structure a. A flanged structure g is fixedly connected to the bottom side of the main structure a. A load-bearing structure k is provided on the left and right sides of the main structure a. A flanged structure f is fixedly connected to the outside of the load-bearing structure k. A pressure-resistant plate is fixedly provided on the top of the main structure a to cope with the compressive load that may be subjected to during use. Load-bearing structures j are provided on the left and right sides of the pressure-resistant plate. The load-bearing structures k and j are key parts for connecting the opening and closing cover to the vehicle body, used to transmit and bear weight and external forces. Brackets are fixedly connected to both ends of the main structure b to provide bottom support for the opening and closing cover. The opening and closing cover adopts a prepreg and foam sandwich composite structure.

[0004] Specifically, the middle layer of the composite structure is made of PET polymer material, the outer layer is made of glass fiber prepreg, and an adhesive film is provided between the layers. The thickness of the PET material is 6mm or 10mm; the glass fiber prepreg includes three specifications: 160g, 360g and 800g.

[0005] Specifically, the flange structure is located at the edge of the opening and closing cover, mainly used for transition connection with other components (such as the vehicle body or adjacent structures), assisting the main structure to achieve edge sealing and prevent dust, moisture and other substances from entering the internal equipment; since this part does not bear the main strength load, in order to reduce weight, this utility model removes the foam core in the design, and each flange structure adopts a solid layer structure of "adhesive film + glass fiber prepreg" to reduce weight while ensuring a sealed connection.

[0006] The beneficial effects of this utility model are as follows: This utility model adopts a composite structure of prepreg and PET foam core. By increasing the number of high-specification glass fiber prepreg layers in the load-bearing areas and setting foam cores in key parts to enhance the compression resistance, the differentiated layup design improves the mechanical strength of the product. For the non-load-bearing areas of the flanged structure, the foam core is removed, and a solid layup structure of "film + glass fiber prepreg" is adopted, which significantly reduces the product weight and meets the lightweight requirements of the rail transit vehicle market. At the same time, the vacuum bag compression molding process is used, which, compared with the traditional hand layup molding process, can effectively reduce interlayer porosity and improve the stability of interlayer bonding strength, making it suitable for mass industrial production. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the thickness distribution of the opening and closing cover of this utility model; Figure 2 This is a schematic diagram of the opening and closing cover of this utility model.

[0008] The following are the numbered components: 1. Main structure a, 2. Main structure b, 3. Thickened structure c, 4. Flanged structure d, 5. Flanged structure e, 6. Flanged structure g, 7. Load-bearing structure k, 8. Flanged structure f, 9. Pressure-resistant plate, 10. Load-bearing structure j, 11. Support. Detailed Implementation

[0009] The present invention will be described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention. Example 1

[0010] A lightweight, high-strength composite material opening and closing cover for rail transit vehicles, such as Figure 1 and Figure 2 As shown, the opening and closing cover includes a main structure a (1) and a main structure b (2). A thickened structure c (3) is provided on the left side of the main structure a (1). A flange structure d (4) is fixedly connected along the outer side of the main structure a (1) and the thickened structure c (3). A flange structure e (5) is fixedly provided on the upper right side of the main structure a (1). A flange structure g (6) is fixedly connected to the bottom side of the main structure a (1). A load-bearing structure k (7) is provided on the left and right sides of the main structure a (1). A flange structure is fixedly connected to the outside of the load-bearing structure k (7). f(8), the top of the main structure a(1) is fixed with a pressure plate (9) to cope with the extrusion load that may be subjected to during use. The left and right sides of the pressure plate (9) are provided with a bearing structure j(10). The bearing structure k(7) and the bearing structure j(10) are key parts for connecting the opening and closing cover with the vehicle body, and are used to transmit and bear weight and external force. The two ends of the main structure b(2) are fixedly connected with brackets (11) to provide bottom support for the opening and closing cover. The overall preparation scheme of the opening and closing cover adopts a prepreg and foam sandwich composite structure.

[0011] Furthermore, in the actual composite material layup process, to reduce surface pinholes after molding and facilitate application, this invention uses an adhesive film as the first layer, a 160g fiberglass prepreg as the second layer, and adhesive films are applied to both the top and bottom of the core layer to facilitate better bonding between the core layer and the prepreg. The final layer is also made of 160g fiberglass prepreg to improve the product's aesthetics. The specific layup details are as follows: Main structure a (1) adopts a layered structure from bottom to top of film*1+160g glass fiber prepreg*1+360g glass fiber prepreg*1+film*1+PET (T=6mm)*1+film*1+360g glass fiber prepreg*1+160g glass fiber prepreg*1; Main structure b (2) adopts a layered structure from bottom to top of film*1+160g glass fiber prepreg*1+360g glass fiber prepreg*2+800g glass fiber prepreg*3+160g glass fiber prepreg*1; Each flange structure is located at the edge of the opening and closing cover, mainly used for transition connection with other components (such as the vehicle body or adjacent structures), assisting the main structure to achieve edge sealing and prevent dust, water vapor and other substances from entering the internal equipment; since this part does not bear the main strength load, in order to reduce weight, this utility model removes the foam core in the design, and each flange structure adopts a solid layer structure of "film + glass fiber prepreg" to reduce weight while ensuring a sealed connection. Specifically: the thickened structure c (3) adopts a layer structure of film*1 + 160g glass fiber prepreg*1 + 360g glass fiber prepreg*1 + 800g glass fiber prepreg*2 + 360g glass fiber prepreg*1 + 160g glass fiber prepreg*2 from bottom to top; the flange structure d (4) adopts a layer structure of film*1 + 160g glass fiber prepreg*1 + 360g glass fiber prepreg*1 + 800g glass fiber prepreg*2 from bottom to top. The layup structure is composed of 4 layers of impregnating material, 1 layer of 360g glass fiber prepreg, and 2 layers of 160g glass fiber prepreg. The flange structure e (5) adopts a layup structure of 1 layer of adhesive film, 160g glass fiber prepreg, 1 layer of 360g glass fiber prepreg, 1 layer of 800g glass fiber prepreg, 2 layer of 360g glass fiber prepreg, 1 layer of 160g glass fiber prepreg. The flange structure f (8) adopts a layup structure of 1 layer of adhesive film, 160g glass fiber prepreg, and 2 layers of 360g glass fiber prepreg, 1 layer of 160g glass fiber prepreg. The prepreg*1+360g glass fiber prepreg*1+800g glass fiber prepreg*5+360g glass fiber prepreg*1+160g glass fiber prepreg*2 layup structure; the flange structure g(6) adopts the film*1+160g glass fiber prepreg*1+360g glass fiber prepreg*1+800g glass fiber prepreg*4+360g glass fiber prepreg*1+160g glass fiber prepreg*2 layup structure from bottom to top; The bracket (11) is fixedly connected to both ends of the main structure b (2) to provide bottom support for the opening and closing cover, enhance the overall structural stability of the opening and closing cover, and enable the opening and closing cover to bear the load more stably during installation and use. Therefore, the bracket (11) adopts a reinforced thickness and adopts a layered structure of film*1+160g glass fiber prepreg*1+360g glass fiber prepreg*1+800g glass fiber prepreg*7+360g glass fiber prepreg*1+160g glass fiber prepreg*2. The compression plate (9) is fixed on the top of the main structure a (1) to bear the compression load, so as to protect the internal structure from compression damage and improve the overall durability of the opening and closing cover. It adopts a layered structure of film*1+160g glass fiber prepreg*1+360g glass fiber prepreg*1+film*1+PET (T=10mm)*1+film*1+360g glass fiber prepreg*1+160g glass fiber prepreg*2; The load-bearing structures k (7) and j (10) are used to connect the opening and closing cover to the vehicle body to transmit and bear the weight and external force of the opening and closing cover, and to ensure the stability of the connection between the opening and closing cover and the vehicle body. Among them, the load-bearing structure k (7) adopts a layup structure of 160g glass fiber prepreg*1+360g glass fiber prepreg*1+800g glass fiber prepreg*2+360g glass fiber prepreg*1+160g glass fiber prepreg*1; the load-bearing structure j (10) adopts a layup structure of 160g glass fiber prepreg*1+360g glass fiber prepreg*1+800g glass fiber prepreg*3+360g glass fiber prepreg*1+160g glass fiber prepreg*1.

[0012] Furthermore, this invention was prepared by vacuum bag pressing according to the differentiated layer design, and the structural data of each layer was modeled and analyzed by the FEA finite element analysis method. The calculation showed that the static strength and structural fatigue index of this invention under aerodynamic load and vibration acceleration load all meet the test requirements.

[0013] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lightweight, high-strength composite material opening and closing cover for rail transit vehicles, characterized in that, The opening and closing cover includes a main structure a (1) and a main structure b (2). A thickened structure c (3) is provided on the left side of the main structure a (1). A flanged structure d (4) is fixedly connected along the outer side of the main structure a (1) and the thickened structure c (3). A flanged structure e (5) is fixedly provided on the upper right side of the main structure a (1). A flanged structure g (6) is fixedly connected to the bottom side of the main structure a (1). A load-bearing structure k (7) is provided on the left and right sides of the main structure a (1). A flanged structure f (8) is fixedly connected to the outside of the load-bearing structure k (7). A pressure-resistant plate (9) is fixedly provided on the top of the main structure a (1). A load-bearing structure j (10) is provided on the left and right sides of the pressure-resistant plate (9). A bracket (11) is fixedly connected to both ends of the main structure b (2). The opening and closing cover adopts a prepreg and foam sandwich composite structure.

2. The lightweight, high-strength composite material opening and closing cover for rail transit vehicles according to claim 1, characterized in that, The composite structure has a middle layer of PET material, an outer layer of glass fiber prepreg, and an adhesive film between the layers.

3. The lightweight, high-strength composite material opening and closing cover for rail transit vehicles according to claim 2, characterized in that, The thickness of the PET material is 6 mm or 10 mm.

4. The lightweight, high-strength composite material opening and closing cover for rail transit vehicles according to claim 2, characterized in that, The fiberglass prepreg is available in three sizes: 160g, 360g, and 800g.

5. The lightweight, high-strength composite material opening and closing cover for rail transit vehicles according to claim 1, characterized in that, All of the aforementioned flange structures adopt a solid layered structure of "adhesive film + glass fiber prepreg".

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