Composite cabin and bottom plate end connecting structure

Abstract

The utility model relates to a connecting structure for a composite cabin and an end part of a bottom plate, which belongs to the technical field of connecting structures for composite cabins and is characterized in that a first groove is formed in the edge of the inner wall of the lower end of a composite cavity, and the section of the first groove is a right trapezoid; the side wall of the first groove is provided with a second groove matched with the L-shaped connecting piece on the metal bottom plate, the L-shaped connecting piece is embedded in the second groove and fixedly connected with the second groove through a countersunk bolt, and the slope face of the first groove is matched with the filled foam material, so that the contact area between the composite cabin body and the metal bottom plate is increased, and the composite cabin body is prevented from being damaged. The connecting position is reasonable in structural design, bearing deformation and stress concentration in the using process are reduced, and the situation that the service life of a product is shortened due to the fact that stress concentration is generated in the connecting position of the composite cabin body and the bottom plate in the using process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of composite cabin connection structures, and particularly relates to a connection structure between a composite cabin and the end of a bottom plate. Background Art

[0002] The current mobile cabin technology has become more perfect and has a wider range. Classified by function, the cabins can be divided into electronic type, mechanical type, power supply type, and other types. Classified by cabin structure, they can be divided into frame mobile cabins, large panel mobile cabins, and integrally formed composite material cabins. At present, the integrally formed composite material cabin is integrally formed by vacuum infusion with a structure of inner and outer composite material skins plus core materials. The connection and fixation between the integrally formed cabin and the bottom plate cannot use welding. Instead, when using the riveting method, the resin at the blind rivets of the cabin skin is prone to fragmentation and loosening; when adding prefabricated metal parts to the inner side of the cabin wall panel, delamination is likely to occur between the metal parts and the skin after long-term use.

[0003] A connection structure for a carbon fiber composite material mobile cabin disclosed in the prior art with the publication number CN104085116A includes a mobile cabin large panel, a corner piece, and an edge component. The top plate and each side plate, and the bottom plate and each side plate are respectively bonded with structural adhesive by the edge component and fixed by riveting in batches. The edge component is bonded with structural adhesive and fixed by riveting through the corner piece; sealant and structural adhesive are filled between the corner piece and each side plate, and between the edge component and each side plate. The corner piece and each side plate, and the edge component and each side plate are riveted by rivets. The mobile cabin large panels are sealed with sealant. The corner piece and the edge component are made of carbon fiber fabric prepreg as raw materials and manufactured by a composite material forming process. This structure has the advantages of good sealing performance, rainproof, small thermal deformation, preventing fasteners from loosening and falling off due to thermal deformation, reducing thermal stress concentration at the same time, and anti-rust, greatly improving the reliability and sealing performance of the overall structure of the carbon fiber composite material large panel mobile cabin.

[0004] However, the above structure is relatively complex as a whole, uses more auxiliary parts, the parts are easy to lose, and the installation is time-consuming. Therefore, there is a need for improvement in this solution. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to aim at the deficiencies of the prior art, and the purpose is to solve the problem that the connection structure between the existing composite cabin and the bottom plate is relatively complex in structure and has more accessories in order to achieve firm connection, and to provide a connection structure between the composite cabin and the end of the bottom plate.

[0006] The technical solution of the present utility model to solve the above technical problems is as follows: A connecting structure between a composite material cabin body and the end of a bottom plate, including a metal bottom plate, characterized in that an L-shaped connecting piece is fixedly connected to the metal bottom plate, and a composite material cabin body is further provided on the metal bottom plate. A first groove is opened at the edge of the inner wall at the lower end of the composite material cabin body. The cross-section of the first groove is a right-angled trapezoid. A second groove matching the shape of the L-shaped connecting piece is opened on the side wall of the first groove. The L-shaped connecting piece is embedded in the second groove. The composite material cabin body is fixedly connected to the L-shaped connecting piece through a countersunk head bolt. The first groove is filled with foam material, and a carbon fiber reinforced layer is provided outside the foam material.

[0007] Further, the composite material cabin body includes an inner skin, an outer skin and a sandwich panel. The sandwich panel adopts a PVC foam sandwich panel. The sandwich panel is arranged between the inner skin and the outer skin, and a skeleton for strengthening the structure is arranged in the sandwich panel.

[0008] Further, mesh grooves are opened on the connecting surfaces of the sandwich panel with the inner skin and the outer skin, and through holes penetrating the core material are arranged at the intersection points of the mesh grooves.

[0009] Further, the mesh grooves on the upper and lower surfaces of the sandwich panel are symmetrical to each other. The slot spacing of the mesh grooves is 20mm * 20mm, and the diameter of the through hole is 2mm.

[0010] Further, the skeleton is a rectangular beam or an I-beam.

[0011] Further, the connecting surfaces of the composite material cabin body with the metal bottom plate and the L-shaped connecting piece are adhesively bonded to each other through a sealing structural adhesive.

[0012] Further, the cross-section of the carbon fiber reinforced layer is L-shaped. The carbon fiber reinforced layer covers the outside of the foam material, and both ends of the carbon fiber reinforced layer extend to contact with the composite material cabin body and the metal bottom plate.

[0013] The beneficial effects of the present utility model are as follows: By opening a first groove at the edge of the inner wall at the lower end of the composite cavity, the cross-section of the first groove is a right-angled trapezoid, and a second groove matching the L-shaped connecting piece on the metal bottom plate is opened on the side wall of the first groove. By embedding the L-shaped connecting piece in the second groove and fixedly connecting it through a countersunk head bolt, and the slope of the first groove is matched with the filled foam material, the contact area between the composite material cabin body and the metal bottom plate is increased. The structure design of the connection part is reasonable, reducing the bearing deformation and stress concentration during use, and avoiding the reduction of the product service life caused by stress concentration at the connection between the composite material cabin body and the bottom plate during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 It is a schematic structural diagram of the first working state of the composite material cavity of the present utility model;

[0016] Figure 3 It is a schematic structural diagram of the second working state of the composite material cavity of the present utility model;

[0017] Figure 4 It is a schematic structural diagram of the sandwich panel of the present utility model;

[0018] In the figure: 1. Metal bottom plate, 2. L-shaped connecting piece, 3. Composite material cabin, 4. First groove, 5. Second groove, 6. Countersunk head bolt, 7. Foam material, 8. Carbon fiber reinforced layer, 9. Inner skin, 10. Outer skin, 11. Sandwich panel, 12. Skeleton, 13. Mesh groove, 14. Through hole. Specific implementation mode

[0019] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The embodiments cited are only used to explain the present utility model and are not used to limit the scope of the present utility model.

[0020] As Figures 1 to 4 shown, a connection structure between a composite material cabin and the end of a bottom plate in this embodiment includes a metal bottom plate 1, an L-shaped connecting piece 2 fixedly connected to the metal bottom plate 1, and further includes a composite material cabin 3 provided on the metal bottom plate 1. A first groove 4 is opened at the edge of the lower inner wall of the composite material cabin 3. The cross-section of the first groove 4 is a right trapezoid. A second groove 5 matching the shape of the L-shaped connecting piece 2 is opened on the side wall of the first groove 4. The L-shaped connecting piece 2 is embedded in the second groove 5. The composite material cabin 3 is fixedly connected to the L-shaped connecting piece 2 through a countersunk head bolt 6. The first groove 4 is filled with a foam material 7, and a carbon fiber reinforced layer 8 is provided outside the foam material 7.

[0021] In this embodiment, the composite material cabin 3 includes an inner skin 9, an outer skin 10 and a sandwich panel 11. The sandwich panel 11 is a PVC foam sandwich panel. The sandwich panel 11 is provided between the inner skin 9 and the outer skin 10. A skeleton 12 for strengthening the structure is provided in the sandwich panel 11. The skeleton 12 is a rectangular beam or an I-beam.

[0022] In this embodiment, the cross-section of the carbon fiber reinforced layer 8 is L-shaped. The carbon fiber reinforced layer 8 covers the outside of the foam material 7 and both ends of the carbon fiber reinforced layer 8 extend to contact with the composite material cabin 3 and the metal bottom plate 1 for strengthening the area filled with the foam material 7.

[0023] In this embodiment, a mesh groove 13 is formed on the connection surface of the sandwich panel 11 with the inner skin 9 and the outer skin 10. A through hole 14 penetrating the core material is provided at the intersection point of the mesh grooves 13. The mesh grooves 13 on the upper and lower surfaces of the sandwich panel 11 are symmetric with each other. The slotting pitch of the mesh grooves 13 is 20mm * 20mm, and the diameter of the through hole 14 is 2mm. By designing a reasonable structure on the connection surface of the sandwich panel 11, the bonding force between the inner skin 9, the outer skin 10 and the sandwich panel 11 is increased, the load-bearing capacity of the product is improved, the overall cabin structure is strengthened, and the load-bearing deformation and stress concentration during use are reduced.

[0024] In this embodiment, the connection surfaces of the composite cabin 3 with the metal bottom plate 1 and the L-shaped connecting piece 2 are adhesively bonded to each other by a sealant to strengthen the connection strength between the composite cavity 3 and the metal bottom plate 1 and improve the service life of the product.

[0025] Working principle: A first groove 4 with a right trapezoidal cross-section is formed on the inner edge of the lower end of the composite cabin 3, and a foam material 7 is filled in the first groove 4. Through the cooperation of the upper slope surface of the first groove 4 and the foam material 7, a notch is additionally opened at the low stress area, that is, the inner edge of the lower end of the composite cabin 3, so that the transition of stress from the low stress area to the high stress area tends to be gentle, and the concentrated stress at the connection between the composite cabin 3 and the metal bottom plate 1 is prevented from being too large, resulting in a reduction in the service life of the product.

[0026] The above embodiments are only one implementation manner of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A composite cabin and bottom plate end connection structure, comprising a metal bottom plate (1), characterized in that: The metal bottom plate (1) is fixedly connected to an L-shaped connecting piece (2), and further comprises a composite cabin (3) arranged on the metal bottom plate (1); a first groove (4) is provided at the edge of the inner wall at the lower end of the composite cabin (3); the vertical section of the first groove (4) is a right-angled trapezoid; a second groove (5) matching the shape of the L-shaped connecting piece (2) is provided on the side wall of the first groove (4); the L-shaped connecting piece (2) is embedded in the second groove (5); the composite cabin (3) is fixedly connected to the L-shaped connecting piece (2) by means of countersunk bolts (6); the first groove (4) is filled with a foam material (7); a carbon fiber reinforcement layer (8) is provided on the outer side of the foam material (7).

2. A composite cabin and bottom plate end connection structure according to claim 1, characterized in that: The composite cabin (3) comprises an inner skin (9), an outer skin (10) and a sandwich panel (11); the sandwich panel (11) is a PVC foam sandwich panel; the sandwich panel (11) is arranged between the inner skin (9) and the outer skin (10); and a frame (12) for strengthening the structure is arranged inside the sandwich panel (11).

3. A composite cabin and bottom plate end connection structure according to claim 2, characterized in that: The connecting surfaces of the sandwich panel (11) and the inner skin (9) and the outer skin (10) are provided with mesh grooves (13), and through holes (14) penetrating the core material are provided at the intersection points of the mesh grooves (13).

4. A composite cabin and bottom plate end connection structure according to claim 3, characterized in that: The mesh grooves (13) on the upper and lower surfaces of the sandwich panel (11) are symmetrical to each other, the slot spacing of the mesh grooves (13) is 20mm*20mm, and the diameter of the through holes (14) is 2mm.

5. The composite cabin and bottom plate end connection structure according to claim 2, characterized in that: The frame (12) is a rectangular beam or an I-beam.

6. The composite cabin and bottom plate end connection structure according to claim 1, characterized in that: The connecting surfaces of the composite cabin body (3), the metal bottom plate (1) and the L-shaped connecting piece (2) are bonded to each other by means of a sealing structural adhesive.

7. The composite cabin and bottom plate end connection structure according to claim 1, characterized in that: The carbon fiber reinforced layer (8) has an L-shaped cross section, covers the outside of the foam material (7), and both ends of the carbon fiber reinforced layer (8) extend to contact the composite cabin body (3) and the metal bottom plate (1).

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