Combined box-shaped fiber preform

Abstract

The utility model discloses a combined box-shaped fiber prefabricated body which comprises at least two element box pieces, the element box pieces are provided with upper openings, the adjacent element box pieces are sewn together through corresponding side walls of the element box pieces, and reserved cloth layers are arranged at the upper ends of the corresponding side walls of the element box pieces. And the reserved cloth layer is folded to the top of the element box piece on one side after being pre-shaped and is sewn and fixed with the element box piece on one side. Through the design that the reserved cloth layers at the upper ends of the corresponding side walls between the adjacent element box pieces are folded towards the same side and the design of the carbon fiber reinforced cloth and the thickening layers at the upper ends, the continuity and the uniformity of force transmission under the action of external force are improved, so that the overall stability and the bearing capacity of the prefabricated body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fiber preforms, in particular to a combined box-shaped fiber preform. Background Art

[0002] The box-shaped fiber preform is the key reinforcing substrate and skeleton of the box-shaped fiber composite material, which determines the overall performance of the composite material. Because of its light weight and good designability, it can meet the functional requirements of heat protection, wave transmission, and ablation resistance in harsh use environments. It is often used in the main load-bearing structure of large-sized special-shaped structural parts in the fields of aerospace, national defense and military industry.

[0003] This type of structural component is large in size, complex in configuration, asymmetrical in structure, and has various angles. It is generally formed by splicing multiple semi-enclosed boxes. The current splicing method is to completely sew the corresponding side walls of adjacent boxes together. If there is a gap, it is filled with fiber bundles for suturing. When subjected to external forces, especially vertical forces, the force on the upper end of the splicing cannot be transmitted continuously and evenly, which is prone to distortion and suturing fracture at the splicing, thereby affecting the overall stability and load-bearing capacity of the structural component.

[0004] Therefore, it is necessary to provide a new combined box-shaped fiber preform to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a combined box-shaped fiber preform, which improves the continuity and uniformity of force transmission when external force acts, thereby improving the overall stability and bearing capacity of the preform through the design of the reserved cloth layers at the upper ends of the corresponding side walls between adjacent elementary box parts being folded to the same side and the design of the carbon fiber reinforced cloth and the upper end thickening layer.

[0006] To achieve the above-mentioned purpose, the utility model provides the following scheme: a combined box-shaped fiber preform, comprising at least two elementary box parts, the elementary box parts are all set with upper openings, adjacent elementary box parts are sewn together through their corresponding side walls, and the upper ends of their corresponding side walls are provided with reserved cloth layers, and the reserved cloth layers are folded to the top of the elementary box part on one side after being pre-formed and sewn and fixed thereto.

[0007] Furthermore, the elementary box is a contoured ply integrated structure, including a plurality of unit structure layers.

[0008] Furthermore, the unit structure layer is two layers of carbon fiber satin cloth composited with a layer of carbon fiber grid winding layer.

[0009] Furthermore, at least one side wall of the elementary box is a plane side wall, and the plane side walls corresponding to adjacent elementary box parts completely overlap.

[0010] Furthermore, the upper ends of the adjacent elementary boxes are located in the same plane.

[0011] Furthermore, the reserved fabric layer is an extension of the side wall to which it belongs.

[0012] Furthermore, the width of the reserved fabric layer is 1 / 6 to 1 / 4 of the width of the elementary box on the folded side.

[0013] Furthermore, carbon fiber reinforcement cloth is provided between corresponding plane side walls of adjacent elementary boxes.

[0014] Furthermore, the upper portion of the carbon fiber reinforced cloth is arranged between the reserved cloth layers corresponding to adjacent elementary box components, and the lower portion is placed between the plane side walls corresponding to the joints of adjacent elementary box components.

[0015] Furthermore, the outer dimensions of the upper portion of the carbon fiber reinforced cloth are consistent with the outer dimensions of the reserved cloth layer, and the outer dimensions of the lower portion are consistent with the outer dimensions of the plane side walls corresponding to the joints of adjacent elementary boxes.

[0016] Furthermore, a thickening layer is provided at the upper end of the adjacent elementary box parts except for the folded area.

[0017] Furthermore, the thickness of the thickened layer is consistent with the thickness of the fabric layer in the folded area, and the two ends are sewn and connected to the fabric layer in the folded area in sequence.

[0018] Furthermore, the material of the thickening layer is carbon fiber cloth.

[0019] The advantages of the present invention compared to the prior art are:

[0020] (1) By designing that the reserved cloth layers at the upper ends of the corresponding side walls between adjacent elementary boxes are folded toward the same side, the force can be continuously transmitted when subjected to external force, thereby improving the overall stability and bearing capacity of the preform.

[0021] (2) The design of the carbon fiber reinforced cloth increases the thickness of the joints, and the design of the thickened layer is conducive to improving the continuity and uniformity of the upper end force transmission, which further improves the overall stability and bearing capacity of the preform.

[0022] (3) The splicing method of the utility model is applicable to the splicing of symmetrical elementary box parts as well as the splicing of asymmetrical elementary box parts, and has no limit on the number of elementary box parts that can be spliced. That is, the splicing shape and number can be designed according to the use environment, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a box-shaped fiber preform according to Example 1 of the utility model.

[0024] Figure 2 This is a schematic structural diagram of a box-shaped fiber preform according to Example 2 of the utility model.

[0025] Figure 3 This is a schematic structural diagram of a box-shaped fiber preform according to Example 3 of the utility model.

[0026] In the figure: the first primitive box component 1 includes: a first left side wall 11, a first left reserved cloth layer 12, a first thickening layer 13, a first front side wall 14, and a first front reserved cloth layer 15; the second primitive box component 2 includes: a second right side wall 21, a second right reserved cloth layer 22, and a second thickening layer 23; the third primitive box component 3 includes: a third rear side wall 31, a third rear reserved cloth layer 32, and a third thickening layer 33; the fourth primitive box component 4; a first carbon fiber reinforced cloth 5; and a second carbon fiber reinforced cloth 6. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] like Figure 1 The combined box-shaped fiber preform shown is formed by splicing and sewing a first primitive box 1 and a second primitive box 2. The first primitive box 1 and the second primitive box 2 are both formed by a plurality of unit structure layers of contoured ply, and the unit structure layer is two layers of carbon fiber satin cloth and a layer of carbon fiber grid winding ply.

[0030] The first primitive box 1 and the second primitive box 2 are both opened at the top, and the upper end of the first primitive box 1 and the upper end of the second primitive box 2 are in the same plane. When spliced, the first left side wall 11 of the first primitive box 1 and the second right side wall 21 of the second primitive box 2 are completely overlapped.

[0031] In order to prevent the upper joint of the box-shaped fiber preform from twisting or fiber breakage when subjected to force, thereby affecting the overall stability and load-bearing capacity of the preform, an extension section is provided at the upper end of the first left wall 11 of the first primitive box 1 and the upper end of the second right wall 21 of the second primitive box 2, namely a first left reserved cloth layer 12 and a second right reserved cloth layer 22, whose widths are 1 / 6 to 1 / 4 of the width of the upper end of the first primitive box 1. After the first left reserved cloth layer 12 and the second right reserved cloth layer 22 are overlapped and pre-shaped, they are folded to the upper end of the first primitive box 1 and sewn and fixed thereto.

[0032] In order to further improve the bearing strength of the joint, the utility model is also provided with a first carbon fiber reinforced cloth 5, the upper part of the first carbon fiber reinforced cloth 5 is placed between the first left reserved cloth layer 12 and the second right reserved cloth layer 22, and is pre-shaped together with the first left reserved cloth layer 12 and the second right reserved cloth layer 22, and then folded to the upper end of the first element box 1 and sewn and fixed thereto, and the lower part of the first carbon fiber reinforced cloth 5 is placed in the middle of the first left side wall 11 and the second right side wall 21 and sewn thereto. Among them, the outer dimensions of the upper part of the first carbon fiber reinforced cloth 5 are consistent with the outer dimensions of the first reserved cloth layer 12 or the second reserved cloth layer 22, and the outer dimensions of the lower part are consistent with the outer dimensions of the first left side wall 11 or the second right side wall 21.

[0033] Furthermore, in addition to the folding area, the upper ends of the first elementary box 1 and the second elementary box 2 are provided with a first thickening layer 13 and a second thickening layer 23. The first thickening layer 13 and the second thickening layer 23 are both carbon fiber cloth, and the thickness thereof is consistent with the thickness of the cloth layer in the folding area. The two ends are respectively sewn and connected with the cloth layer in the folding area in sequence, so that the upper end of the preform is in the same plane.

[0034] Example 2

[0035] like Figure 2 The combined box-shaped fiber preform shown is an extension of Example 1. Compared with Example 1, the improvements are:

[0036] A first front reserved fabric layer 15 is provided at the upper end of the first front side wall 14 of the first elementary box component 1, and a third elementary box component 3 is spliced ​​and sewn on the front side of the preform of Example 1. The third elementary box component 3 is arranged with an upper opening, and the outer dimensions of its third rear side wall 31 are consistent with the outer dimensions of the first front side wall 14, and a third rear reserved fabric layer 32 is also provided at the upper end of the third rear side wall 31. The first front reserved fabric layer 15 and the third rear reserved fabric layer 32 are folded to the upper end of the third elementary box component 3 and sewn and fixed thereto.

[0037] Furthermore, the structural unit layer of the third primitive box 3 is consistent with that of the first primitive box 1 or the second primitive box 2 .

[0038] Furthermore, a second carbon fiber reinforcement cloth 6 is provided between the first elementary box 1 and the third elementary box 3 , and the arrangement principle of the second carbon fiber reinforcement cloth 6 is the same as that of the first carbon fiber reinforcement cloth 5 .

[0039] Furthermore, a third thickening layer 33 is provided at the upper end of the third elementary box except for the folding area, and its principle is the same as that of the first thickening layer 13 or the second thickening layer 23 .

[0040] Example 3

[0041] like Figure 3 The combined box-shaped fiber preform shown is a further development on the basis of Example 2, that is, a fourth elementary box 4 is sewn on the front side of the second elementary box 2 and the left side of the third elementary box 3, and the fourth elementary box 4 is also opened, and the connection principle of its rear side and right side with the front side of the second elementary box 2 and the left side of the third elementary box 3 is exactly the same, which will not be repeated here.

[0042] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other. In addition, the present technical solution only requires consistency in the external dimensions of the joints of adjacent elementary boxes, and does not impose any restrictions on other parts, which can be designed and selected according to the use environment. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the utility model; at the same time, for those of ordinary skill in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation method and scope of application. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A combined box-shaped fiber preform, characterized in that: The invention comprises at least two elementary box parts, each of which is open at the top, and adjacent elementary box parts are sewn together through their corresponding side walls, and reserved cloth layers are arranged on the upper ends of the corresponding side walls, and the reserved cloth layers are folded to the top of the elementary box part on one side after being pre-shaped and sewn and fixed thereto.

2. The combined box-shaped fiber preform according to claim 1, characterized in that: The elementary box is a contoured ply integrated structure, including a plurality of unit structure layers.

3. The combined box-shaped fiber preform according to claim 2, characterized in that: The unit structure layer is composed of two layers of carbon fiber satin cloth and one layer of carbon fiber grid winding layer.

4. The combined box-shaped fiber preform according to claim 1, characterized in that: At least one side wall of the elementary box is a plane side wall, and the plane side walls corresponding to adjacent elementary box completely overlap, and the upper ends of adjacent elementary box are in the same plane.

5. The combined box-shaped fiber preform according to claim 1, characterized in that: The reserved fabric layer is an extension of the side wall to which it belongs.

6. The combined box-shaped fiber preform according to claim 5, characterized in that: The width of the reserved fabric layer is 1 / 6 to 1 / 4 of the width of the elementary box on the folded side.

7. The combined box-shaped fiber preform according to claim 1, characterized in that: Carbon fiber reinforcement cloth is arranged between corresponding plane side walls of adjacent elementary box parts.

8. The combined box-shaped fiber preform according to claim 7, characterized in that: The upper part of the carbon fiber reinforced cloth is arranged between the reserved cloth layers corresponding to adjacent elementary box parts, and the lower part is placed between the plane side walls corresponding to the joints of adjacent elementary box parts; the outer dimensions of the upper part of the carbon fiber reinforced cloth are consistent with the outer dimensions of the reserved cloth layers, and the outer dimensions of the lower part are consistent with the outer dimensions of the plane side walls corresponding to the joints of adjacent elementary box parts.

9. The combined box-shaped fiber preform according to claim 1, characterized in that: A thickening layer is arranged at the upper end of the adjacent elementary box parts except for the folding area.

10. The combined box-shaped fiber preform according to claim 9, characterized in that: The thickness of the thickening layer is consistent with the thickness of the cloth layer in the folding area, and the two ends are respectively sewn and connected with the cloth layer in the folding area in sequence; the material of the thickening layer is carbon fiber cloth.

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