Polymethacrylimide sandwiched carbon fiber hollow tube

Abstract

The utility model relates to a pipe, in particular to a carbon fiber hollow pipe with a polymethacrylimide sandwich. Comprising an inner carbon fiber layer of a tubular structure, a polymethacrylimide layer fixedly arranged outside the inner carbon fiber layer, a carbon fiber yarn layer fixedly arranged outside the polymethacrylimide layer and an outer carbon fiber layer fixedly arranged outside the carbon fiber yarn layer. The utility model has the advantages of light weight, high strength and rigidity, excellent corrosion resistance and energy absorption effect, improved impact resistance and crashworthiness of the product, and effectively prolonged service life of the product.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of tubular goods, specifically to a kind of hollow tube of carbon fiber of polymethacrylimide sandwich. BACKGROUND

[0002] In the field of unmanned aerial vehicle, lightweight has important significance, especially quadcopter unmanned aerial vehicle, arm is its important component, among them, part high-end aircraft its arm adopts pure carbon fiber hollow tube, due to its operation and use environment influence, often there will be impact situation, however, the pure carbon fiber tube of existing, its weight is heavy, energy-absorbing effect and crashworthiness are poor, product crack is easily caused, damage occurs.

[0003] Therefore, there is an urgent need for a new type of carbon fiber hollow tube, compared with traditional pure carbon fiber tube, its weight is light, strength stiffness is big, has excellent corrosion resistance and energy-absorbing effect, improves the impact resistance and crashworthiness of product, effectively prolongs the service life of product. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of hollow tube of carbon fiber of polymethacrylimide sandwich, its weight is light, strength stiffness is big, has excellent corrosion resistance and energy-absorbing effect, improves the impact resistance and crashworthiness of product, effectively prolongs the service life of product.

[0005] The utility model adopts the following technical solutions:

[0006] A kind of hollow tube of carbon fiber of polymethacrylimide sandwich, including the inner layer carbon fiber layer of tubular structure, the polymethacrylimide layer of being fixed to the outer of inner layer carbon fiber layer, the carbon fiber silk layer of being fixed to the outer of polymethacrylimide layer and the outer layer carbon fiber layer of being fixed to the outer of carbon fiber silk layer.

[0007] To further improve the crashworthiness and service life of product, the outer of outer layer carbon fiber layer is coated with anti-ultraviolet layer, the outer of anti-ultraviolet layer is coated with anti-collision layer, wherein the anti-ultraviolet layer is the polyethylene layer added with ultraviolet absorber, and the anti-collision layer is the aspartic polyurea layer.

[0008] To consider cost and product performance, the thickness ratio of the inner layer carbon fiber layer, polymethacrylimide layer, carbon fiber silk layer and outer layer carbon fiber layer is 1:2.5:0.2:0.8, and the total thickness of the inner layer carbon fiber layer, polymethacrylimide layer, carbon fiber silk layer and outer layer carbon fiber layer is 1.5-4 millimeters.

[0009] To improve product performance, the inner layer carbon fiber layer, polymethacrylimide layer, carbon fiber silk layer and outer layer carbon fiber layer are integrally formed, and the specific production process is as follows:

[0010] 1. Prepare rigid outer mold and silica gel inner expanding core mold, 2. Apply release agent on the silica gel inner expanding core mold, 3. Roll the inner layer of carbon fiber layer, 4. Cut the poly-methyl acrylimide sheet to the right size and roll it onto the silica gel core mold with the inner layer of carbon fiber layer, due to the material properties, the sheet will expand, and use carbon fiber wire to fix it until it is basically complete, forming a carbon fiber wire layer, 5. Roll the outer layer of carbon fiber layer, 6. Put it into the rigid outer mold for high temperature curing. The curing time is: 1, keep it at 90 DEG C for 1 hour, so that the silica gel expands fully and provides sufficient pressure, 2, keep it at 130 DEG C for 2 hours to cure the product.

[0011] After the above process, the silica gel inner expanding core mold and the rigid outer mold are removed, and a new type of carbon fiber hollow pipe with light weight and good crashworthiness is obtained. If it is necessary to further improve the crashworthiness and service life, the obtained hollow pipe is coated with an anti-UV layer and an anti-collision layer coating in sequence.

[0012] Meanwhile, in order to further improve the mechanical strength of the pipe, a plurality of reinforcing ribs are arranged around the inner surface of the inner layer of carbon fiber layer, the reinforcing rib comprises a carbon fiber rib layer in U-shaped structure and a poly-methyl acrylimide filling layer fixedly arranged in the carbon fiber rib layer; in the radial direction, the thickness ratio of the carbon fiber rib layer and the poly-methyl acrylimide filling layer is 1:2.5; the production process of the reinforcing rib is as follows:

[0013] 1. Prepare rigid outer mold and silica gel inner expanding core mold with grooves, 2. Apply release agent on the silica gel inner expanding core mold, 3. Preliminarily roll the inner layer of carbon fiber layer, 4. Arrange the carbon fiber rib layer in the grooves, 5. Put the poly-methyl acrylimide foam strip prepared in advance into the grooves, 6. Continue to roll the inner layer of carbon fiber layer, 7. Cut the poly-methyl acrylimide sheet to the right size and roll it onto the silica gel core mold with the inner layer of carbon fiber layer, due to the material properties, the sheet will expand, and use carbon fiber wire to fix it until it is basically complete, forming a carbon fiber wire layer, 8. Roll the outer layer of carbon fiber layer, 9. Put it into the rigid outer mold for high temperature curing. The curing time is: 1, keep it at 90 DEG C for 1 hour, so that the silica gel expands fully and provides sufficient pressure, 2, keep it at 130 DEG C for 2 hours to cure the product.

[0014] As can be seen from the above description of the structure of the utility model, compared with the prior art, the utility model has the following advantages: 1, the utility model adds a poly-methyl acrylimide layer and a carbon fiber wire layer between the two carbon fiber layers, and adopts a silica gel expanding process, so that the product is integrally formed, the time consumption is short, the weight of the product is reduced, the crashworthiness of the pipe is improved, and the service life of the product is prolonged; 2, by further coating an anti-collision layer and an anti-UV layer, the crashworthiness and service life of the pipe are further improved; 3, the pipe is provided with reinforcing ribs in the inner layer of carbon fiber layer, so that the mechanical strength of the pipe is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Schematic diagram of the three-dimensional structure of the utility model Figure 1 ;

[0016] Figure 2 Schematic diagram of the three-dimensional structure of the utility model Figure 2 ;

[0017] Mark explanation:

[0018] Inner layer carbon fiber layer 1, polymethacrylimide layer 2, carbon fiber silk layer 21, outer layer carbon fiber layer 3, ultraviolet-proof layer 4, anti-collision layer 5, reinforcing rib 6, carbon fiber rib layer 61, polymethacrylimide filling layer 62. Specific implementation

[0019] The specific implementation of the utility model is described below with reference to the drawings. Embodiment

[0020] Referring to Figure 1 A polymethacrylimide sandwiched carbon fiber hollow pipe, comprising an inner layer carbon fiber layer 1 in a tubular structure, a polymethacrylimide layer 2 fixed outside the inner layer carbon fiber layer 1, a carbon fiber silk layer 21 fixed outside the polymethacrylimide layer 2 and an outer layer carbon fiber layer 3 fixed outside the carbon fiber silk layer 21.

[0021] In order to further improve the product's anti-collision performance and service life, an ultraviolet-proof layer 4 is coated outside the outer layer carbon fiber layer 3, and an anti-collision layer 5 is coated outside the ultraviolet-proof layer 4, wherein the anti-collision layer 5 is an aspartic polyurea layer, and the ultraviolet-proof layer 4 is a polyethylene layer added with an ultraviolet absorber.

[0022] In order to balance the cost and product performance, the thickness ratio of the inner layer carbon fiber layer 1, the polymethacrylimide layer 2, the carbon fiber silk layer 21 and the outer layer carbon fiber layer 3 is 1:2.5:0.2:0.8, and the total thickness of the inner layer carbon fiber layer 1, the polymethacrylimide layer 2, the carbon fiber silk layer 21 and the outer layer carbon fiber layer 3 is 2 millimeters, wherein the thickness of the polymethacrylimide layer 2 is 1.2 millimeters.

[0023] In order to shorten the production cycle and reduce the production cost, the inner layer carbon fiber layer 1, the polymethacrylimide layer 2, the carbon fiber silk layer 21 and the outer layer carbon fiber layer 3 are integrally formed. Embodiment

[0024] On the basis of embodiment one, a plurality of reinforcing ribs 6 are arranged around the inner surface of the inner carbon fiber layer 1, the reinforcing rib 6 comprises a carbon fiber rib layer 61 in U-shaped structure and a polymethacrylimide filling layer 62 fixed in the carbon fiber rib layer 61, and the thickness ratio of the carbon fiber rib layer 61 and the polymethacrylimide filling layer 62 is 1:2.5 in the radial direction.

[0025] In order to shorten the production cycle and reduce the production cost, the inner carbon fiber layer 1, the polymethacrylimide layer 2, the carbon fiber wire layer 21, the reinforcing rib 6 and the outer carbon fiber layer 3 are integrally formed

[0026] The above is only a specific embodiment of the present application, but the design concept of the present application is not limited to this, any non-essential change of the present application by using this concept should belong to the act of infringing the protection scope of the present application.

Claims

1. A carbon fiber hollow tube with a polymethacrylimide core, characterized in that: It includes an inner carbon fiber layer with a tubular structure, a polymethacrylimide layer fixed outside the inner carbon fiber layer, a carbon fiber filament layer fixed outside the polymethacrylimide layer, and an outer carbon fiber layer fixed outside the carbon fiber filament layer.

2. The polymethacrylimide-core carbon fiber hollow tube according to claim 1, characterized in that: The outer carbon fiber layer is coated with an ultraviolet-resistant layer.

3. The polymethacrylimide-core carbon fiber hollow tube according to claim 2, characterized in that: The UV-protective layer is coated with an impact-resistant layer.

4. The polymethacrylimide-core carbon fiber hollow tube according to claim 3, characterized in that: The impact-resistant layer is an aspartic polyurea layer.

5. A polymethacrylimide-core carbon fiber hollow tube according to claim 3 or 4, characterized in that: The UV-protective layer is a polyethylene layer with added UV absorbers.

6. The polymethacrylimide-core carbon fiber hollow tube according to claim 1, characterized in that: The thickness ratio of the inner carbon fiber layer, the polymethacrylimide layer, the carbon fiber filament layer, and the outer carbon fiber layer is 1:2.5:0.2:0.

8.

7. A polymethacrylimide-core carbon fiber hollow tube according to claim 1 or 6, characterized in that: The total thickness of the inner carbon fiber layer, the polymethacrylimide layer, the carbon fiber filament layer, and the outer carbon fiber layer is 1.5-4 mm.

8. A polymethacrylimide-core carbon fiber hollow tube according to claim 1 or 6, characterized in that: The inner carbon fiber layer, the polymethacrylimide layer, the carbon fiber filament layer, and the outer carbon fiber layer are integrally formed.

9. A polymethacrylimide-core carbon fiber hollow tube according to claim 1 or 6, characterized in that: The inner carbon fiber layer has several reinforcing ribs surrounding its inner surface.

10. A polymethacrylimide-core carbon fiber hollow tube according to claim 9, characterized in that: The reinforcing rib includes a U-shaped carbon fiber rib layer and a polymethacrylamide filling layer fixed inside the carbon fiber rib layer.

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