Multilayer multifunctional integrated carbon fiber composite pipe, mold and method

Abstract

The application provides a multi-layer multifunctional integrated carbon fiber composite pipe, a mold and a method, and belongs to the field of carbon fiber reinforced polymer matrix composites. The application solves the problems of uneven appearance and single function of the composite pipe body connection. The multi-layer multifunctional integrated carbon fiber composite pipe comprises inner and outer skin and sandwich integrated pipes, a plurality of the pipes are arranged and connected in sequence, each of the inner and outer skin and sandwich integrated pipes comprises an inner pipe and an outer pipe which are nested with each other, and the outer pipe is provided with a reinforcing area at both ends; the pipe further comprises a double-sided connecting ring, the double-sided connecting ring comprises a ring seat, an inner connecting ring, an outer connecting ring and a flange turnup; during installation, the inner connecting ring is sleeved on the outer walls of the two inner pipes and the pipe openings of the two inner pipes are oppositely abutted, the outer connecting ring is inserted into the pipe openings of the two outer pipes, the reinforcing areas of the two outer pipes and the flange turnup form a contraction area, a wrapping material is used to wrap and wind each contraction area and then the wrapping material is flush with the wall of the outer pipe, and a single-sided connecting ring is arranged. The pipe is mainly used on high-end equipment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of carbon fiber reinforced polymer matrix composites, and particularly relates to a multi-layer multi-functional integrated carbon fiber composite pipe, a mold and a method. BACKGROUND

[0002] In recent years, various advanced polymer matrix composites are increasingly and widely applied to high-end equipment in China, and the range and quantity are expanding year by year. As the multi-functional integrated composite pipe for thermal insulation, ventilation, electromagnetic shielding and light transmission is used in this field in recent years, the reinforcing material of the polymer matrix composite is expanded from glass fiber to carbon fiber and aramid fiber, and the polymer matrix material is expanded from traditional polyester resin and epoxy resin to cyanate ester resin, bismaleimide and polyimide.

[0003] The polymer matrix integrated composite pipe has the functions of thermal insulation, ventilation, electromagnetic shielding and light transmission due to its structure and the specific functions of each component material.

[0004] The traditional composite pipe is single, and even if multiple segments are connected, the recess space is not specially designed at both ends, so that the manufactured segments cannot be connected into a flat overall body, and a wrapping ring protrusion for connecting multiple outer pipes appears at the connection, which greatly affects the subsequent installation work and good coordination with the overall equipment. At the same time, the existing composite thermal insulation pipe generally only has the functions of thermal insulation and ventilation. SUMMARY

[0005] Therefore, the present application aims to provide a multi-layer multi-functional integrated carbon fiber composite pipe, a mold and a method to solve the problems of uneven appearance and single function of the composite pipe.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a multi-layer multi-functional integrated carbon fiber composite pipe is provided, comprising:

[0007] The inner and outer skin and the sandwich integrated pipe are provided in multiple numbers and are connected in sequence, each inner and outer skin and sandwich integrated pipe comprises an inner pipe and an outer pipe nested with each other, and the outer pipe is provided with a reinforcing area at both ends.

[0008] The bilateral connecting ring is symmetrical in whole, each adjacent inner and outer skin and sandwich integrated pipe is connected through a bilateral connecting ring; the bilateral connecting ring comprises a ring seat, an inner connecting ring, an outer connecting ring and a flange turn-up, the inner connecting ring and the outer connecting ring are arranged on the ring seat, and the flange turn-up is arranged on the outer connecting ring; during installation, the inner connecting ring is sleeved on the outer walls of the two inner pipes and the pipe openings of the two inner pipes are directly opposite and abut against each other, the outer connecting ring is inserted into the pipe openings of the two outer pipes, and the reinforcing zones of the two outer pipes and the flange turn-up form a contraction zone;

[0009] The wrapping material is wrapped around each contraction zone and is flush with the outer pipe wall;

[0010] The unilateral connecting ring is half of the bilateral connecting ring and is used for closing the free ends of the inner pipe and the outer pipe of the inner and outer skin and sandwich integrated pipe at the head end and the tail end.

[0011] Further, the inner wall of the inner pipe is provided with a light-proof paint coating.

[0012] Further, the outer pipe comprises a hard foam sandwich layer and inner and outer carbon fiber composite material skins, and the inner and outer carbon fiber composite material skins are provided with metal nickel mesh and copper mesh.

[0013] Further, the wrapping material is carbon fiber epoxy resin.

[0014] Further, the inner and outer skin and sandwich integrated pipe is in the shape of a triangle, a rhombus, a rectangle or a combination of a triangle and a rectangle.

[0015] According to another aspect of the present application, a mold for forming the above-mentioned multi-layer multi-functional integrated carbon fiber composite pipe is provided, which comprises an outer skin mold, an inner skin mold, an inner skin, a heat preservation layer and an outer skin, the inner skin mold is arranged at the center position and the inner skin, the heat preservation layer, the outer skin and the outer skin mold are sequentially arranged outward from the center; the outer skin mold comprises right and left symmetrical right and left outer skin molds, a slit mold is arranged between the right and left outer skin molds at the upper and lower parts, a groove is formed between each slit mold and the corresponding position of the outer skin, an injection hole in communication with the heat preservation layer is arranged at the corresponding position of the outer wall of the right and left outer skin molds, and a neck is formed between the inner wall of the two ends of the outer skin mold along the length direction and the outer skin.

[0016] According to another aspect of the present application, a method for using the above-mentioned mold of the multi-layer multi-functional integrated carbon fiber composite pipe is provided, which comprises the following steps:

[0017] S1, combining the right and left outer skin molds, after applying release agent to the slit mold, the right and left outer skin molds are combined into a complete right and left outer skin mold composite;

[0018] S2, forming left and right outer skins, after coating release agent on the inner wall of the left and right outer skin mold complex, laying the outer skin, then forming the outer skin according to the product performance requirements;

[0019] S3, inner skin forming, coating release agent on the inner skin mold and laying the inner skin according to the requirements, then forming the inner skin according to the product performance requirements;

[0020] S4, insulation layer forming, assembling the right outer skin mold, the left outer skin mold, the formed left and right outer skins, the inner skin mold and the formed inner skin to form a complete inner and outer mold complex, and pouring the insulation layer;

[0021] S5, demolding, separating the product and the mold;

[0022] S6, reinforcing the groove depth and the layer design, laying metal nickel mesh and copper mesh in the middle, after reinforcement, the upper and lower outer surfaces of the product are flush, forming a complete outer pipe;

[0023] S7, length trimming, processing and trimming the two end faces of the outer pipe according to the design requirements, ensuring that the two end faces are parallel and perpendicular to the length direction, and processing the length according to the technical requirements, and completing the production.

[0024] According to another aspect of the present application, a method for forming the above-mentioned inner pipe is provided, comprising the following steps:

[0025] S1, core mold processing, polishing the inner pipe forming core mold, and drying after brushing special release agent;

[0026] S2, uniformly spraying light-resistant paint on the surface of the dried release agent for several times until the release agent reaches the required thickness, and then curing in the oven according to the curing system requirements;

[0027] S3, inner pipe body forming, laying multiple layers of epoxy resin carbon fiber prepreg on the surface of the cured inner pipe, each layer is compacted and flattened, and after reaching the required number of layers, vacuumizing and heating and pressurizing curing in an autoclave, and according to the specific curing system, pressure and vacuum degree, after curing, demolding and then processing according to the size, the inner pipe is formed.

[0028] According to another aspect of the present application, a method for assembling the above-mentioned multi-layer multi-functional integrated carbon fiber composite pipe is provided, comprising the following steps:

[0029] S1, material preparation, preparing the inner pipe, outer pipe, double-sided connecting ring, single-sided connecting ring, special adhesive, carbon fiber epoxy resin for wrapping, carbon fiber cloth and metal nickel mesh and copper mesh, special length measuring tool, straight line tooling, special assembly platform, special mechanical polishing tool and dust collection equipment;

[0030] S2, the adjacent inner tube and adjacent outer tube are assembled through the double-sided connecting ring, and the pipe opening is coated with special adhesive before assembly for bonding, the bonding process ensures that the pipes are closely attached to each other, and after the bonding is completed, a certain time is solidified;

[0031] S3, the shrinkage zone formed by every two adjacent outer tubes is wrapped with carbon fiber epoxy resin, and metal nickel mesh and copper mesh are added in the middle as needed, until the wrapping area is higher than the outer tube profile by a certain size, and after 24 hours of solidification, the excess part is mechanically polished off, so that the surface of the whole outer tube is neat and smooth, and the assembly is completed.

[0032] Further, the wrapping area in step S3 is at least 0.3mm higher than the outer tube profile.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] 1. The carbon fiber composite pipe can ensure that the inner tube and the outer appearance are aligned and connected stably, and the surface of the connected outer tube is smooth and flat, which can ensure that the use requirements are met in various working conditions.

[0035] 2. The carbon fiber composite pipe adds metal nickel mesh and copper mesh, which can enhance the electromagnetic shielding performance.

[0036] 3. The inner tube of the carbon fiber composite pipe is coated with light-resistant paint, which can enhance the light transmission performance. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for purposes of explanation and are not intended to limit the application. In the drawings:

[0038] Figure 1 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application;

[0039] Figure 2 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application; Figure 1 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application;

[0040] Figure 3 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application; Figure 1 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application;

[0041] Figure 4 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application; Figure 1 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application;

[0042] Figure 5 is a schematic view of the overall structure of a multi-level multifunctional integrated carbon fiber composite pipe according to the present application;

[0043] Figure 6A cross-sectional view of a multi-layer multi-functional integrated carbon fiber composite pipe according to the present application in a diamond shape;

[0044] Figure 7 A cross-sectional view of a multi-layer multi-functional integrated carbon fiber composite pipe according to the present application in a combination of triangle and rectangle shape;

[0045] Figure 8 A cross-sectional view of a multi-layer multi-functional integrated carbon fiber composite pipe according to the present application in a rectangle shape;

[0046] Figure 9 A cross-sectional view of a multi-layer multi-functional integrated carbon fiber composite pipe according to the present application;

[0047] Figure 10 A cross-sectional view of a double-sided connecting ring according to the present application;

[0048] Figure 11 A side view of a double-sided connecting ring according to the present application;

[0049] Figure 12 A cross-sectional view of a single-sided connecting ring according to the present application;

[0050] Figure 13 A side view of a mold for forming a multi-layer multi-functional integrated carbon fiber composite pipe according to the present application;

[0051] Figure 14 A cross-sectional view of a D-D according to the present application; Figure 13

[0052] Figure 15 A partial enlarged view of E part of the D-D according to the present application; Figure 14

[0053] A partial enlarged view of F part of the D-D according to the present application; Figure 16 Figure 14 A partial enlarged view of G part of the D-D according to the present application;

[0054] Figure 17 Figure 13 A partial enlarged view of G part of the D-D according to the present application;

[0055] Figure 18 A schematic view of the distribution position of the injection hole according to the present application;

[0056] Figure 19 A schematic view of a forming mold of an inner tube according to the present application;

[0057] Figure 20 A schematic view of a finished cross-section of an outer tube according to the present application.

[0058] ​​​Right outer skin mold 1; inner skin mold 2; right outer skin 3; inner skin 4; thermal insulation layer 5; right upper joint mold 6; left half outer mold joint fastening bolt 7; left half outer mold joint fastening nut 8; right lower joint mold 9; left upper joint mold 10; left lower joint mold 11; right upper and lower joint mold fastening bolt 12; left outer skin 13; left outer skin mold 14; left upper and lower joint mold fastening bolt 15; right half outer mold injection hole 16; left half outer mold injection hole 17; inner skin core mold right connecting shaft 18; inner skin core mold left connecting shaft 19; inner skin core mold 20; inner and outer skin and sandwich integrated pipe 21; inner pipe 211; light-resistant paint coating 2111; outer pipe 212; reinforcing area 2121; double-sided connecting ring 22; ring seat 221; inner connecting ring 222; outer connecting ring 223; flange flange 224; single-sided connecting ring 23. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0060] According to one aspect of the present application, a multi-layer multi-functional integrated carbon fiber composite pipe is provided, comprising:

[0061] The inner and outer skin and sandwich integrated pipe 21 is provided in multiple numbers and connected in sequence, and each inner and outer skin and sandwich integrated pipe 21 comprises an inner pipe 211 and an outer pipe 212 nested with each other, and the outer pipe 212 is provided with a reinforcing area 2121 at both ends;

[0062] The double-sided connecting ring 22 has a two-side symmetrical structure as a whole, and each adjacent two inner and outer skin and sandwich integrated pipes 21 are connected through one double-sided connecting ring 22; the double-sided connecting ring 22 comprises a ring seat 221, an inner connecting ring 222, an outer connecting ring 223 and a flange flange 224, the inner connecting ring 222 and the outer connecting ring 223 are arranged on the ring seat 221, and the flange flange 224 is arranged on the side of the outer connecting ring 223; during installation, the inner connecting ring 222 is sleeved on the outer walls of the two inner pipes 211 and the pipe openings of the two inner pipes 211 are directly opposite and abut against each other, the outer connecting ring 223 is inserted into the pipe openings of the two outer pipes 212, and the reinforcing areas 2121 of the two outer pipes 212 form a contraction area with the flange flange 224;

[0063] The wrapping material is wrapped around each contraction area and is flush with the pipe wall of the outer pipe 212;

[0064] The single-sided connecting ring 23 is half of the double-sided connecting ring 22 and is used to close the free ends of the inner tube 211 and the outer tube 212 of the inner and outer skin and sandwich integrated tube 21. The double-sided connecting ring 22 and the single-sided connecting ring 23 are both made of aluminum magnesium alloy aluminum plate and are processed by numerical control center and then are decorated by surface anodizing.

[0065] In the embodiment, the inner wall of the inner tube 211 is provided with a light-avoiding paint coating 2111. The inner tube 211 has the functions of light transmission and light avoidance.

[0066] In the embodiment, the outer tube 212 includes a hard foam sandwich layer and inner and outer carbon fiber composite skins, and the inner and outer carbon fiber composite skins are provided with metal nickel mesh and copper mesh. This arrangement can ensure that the outer tube 212 has the functions of heat preservation, ventilation, electromagnetic shielding, etc.

[0067] In the embodiment, the wrapping material is carbon fiber epoxy resin.

[0068] In the embodiment, the inner and outer skin and sandwich integrated tube 21 is in the shape of a triangle, a rhombus, a rectangle or a combination of a triangle and a rectangle.

[0069] According to one aspect of the present application, a mold for forming the above-mentioned multi-layer multi-functional integrated carbon fiber composite tube is provided, which includes an outer skin mold, an inner skin mold 2, an inner skin 4, a heat preservation layer 5 and an outer skin. The outer skin includes a right outer skin 3 and a left outer skin 13 which are symmetrically arranged. The inner skin mold 2 is arranged at the center position and the inner skin 4, the heat preservation layer 5, the outer skin and the outer skin mold are sequentially arranged outward from the center. The outer skin mold includes a right outer skin mold 1 and a left outer skin mold 14 which are symmetrically arranged. A split mold is arranged at the upper part and the lower part between the right outer skin mold 1 and the left outer skin mold 14. A groove is formed between each split mold and the corresponding outer skin. The groove is used for reinforcing the composite material. After reinforcement, the upper and lower outer surfaces are flush, thereby forming a complete outer contour tube. An injection hole which is in communication with the heat preservation layer 5 is arranged at the corresponding position of the outer wall of the right outer skin mold 1 and the left outer skin mold 14. A neck is formed between the inner wall of the two ends of the outer skin mold along the length direction and the outer skin. When the product is spliced, the neck is used for wrapping the composite material. After wrapping, the outer surface is processed to be flat. The overall shape is more flat and beautiful.

[0070] In the embodiment, the inner skin mold 2 includes an inner skin core mold right connecting shaft 18, an inner skin core mold left connecting shaft 19 and an inner skin core mold 20. The inner skin core mold right connecting shaft 18 and the inner skin core mold left connecting shaft 19 are symmetrically arranged at the two ends of the inner skin core mold 20 and are connected with the inner skin core mold 20. The outer skin mold is connected with the inner skin core mold 20.

[0071] In the embodiment, the slit die comprises an upper slit die and a lower slit die; the upper slit die comprises a left upper slit die 10 and a right upper slit die 6 which are symmetrically arranged and abutted with each other, the left upper slit die 10 is connected with the left outer skin die 14 through a left upper and lower slit die fastening bolt 15, and the right upper slit die 6 is connected with the right outer skin die 1 through a right upper and lower slit die fastening bolt 12; the lower slit die comprises a right lower slit die 9 and a left lower slit die 11 which are symmetrically arranged and abutted with each other, the right outer skin die 1, the right lower slit die 9, the left lower slit die 11 and the left outer skin die 14 are connected through cooperation of a left half outer die die fastening bolt 7 and a left half outer die die fastening nut 8, the connection through the bolt is convenient for overall installation and disassembly, and the connection of the left upper slit die 10, the right upper slit die 6, the right lower slit die 9 and the left lower slit die 11 with the corresponding positions can better control the groove depth, so that the reinforcement can be performed according to the process requirements, and a more flexible adjustment mode is obtained.

[0072] In the embodiment, the injection hole comprises a right half outer die injection hole 16 and a left half outer die injection hole 17, the right half outer die injection hole 16 is arranged on the right outer skin die 1, and the left half outer die injection hole 17 is arranged on the left outer skin die 14.

[0073] In the embodiment, the number of the right half outer die injection hole 16 and the left half outer die injection hole 17 is four, which is convenient for distributing the injection amount and obtaining better and more efficient injection efficiency.

[0074] According to one aspect of the application, a method for using the mold of the multi-layer and multi-functional integrated carbon fiber composite pipe is provided, comprising the following steps:

[0075] S1, combining the left and right outer skin dies, the right upper slit die 6, the right lower slit die 9, the left upper slit die 10 and the left lower slit die 11 are all smeared with a release agent, then the right outer skin die 1 and the left outer skin die 14 are combined into a complete left and right outer skin die composite, and then the corresponding positions are screwed by using the left half outer die die fastening bolt 7, the left half outer die die fastening nut 8, the right upper and lower slit die fastening bolt 12 and the left upper and lower slit die fastening bolt 15;

[0076] S2, forming the left and right outer skins, the inner wall of the left and right outer skin die composite is smeared with a release agent, then wet or dry laying is performed according to the outer skin structure requirements, and then the left and right outer skins are formed according to the product performance requirements, and the forming modes include contact forming, vacuum introduction forming or autoclave, etc.

[0077] S3, inner skin forming, the inner skin die 2 is smeared with a release agent and the inner skin is laid according to the requirements, and then the inner skin is formed according to the product performance requirements, and the forming modes include contact forming, vacuum introduction forming or autoclave, etc.

[0078] S4, the insulation layer is formed, the edge of the inner skin and the left and right outer skins formed in steps S1 and S2 is trimmed to meet the technical requirements, the butt joint of the left and right outer skins is neat and free of interference, the right outer skin mold 1, the left outer skin mold 14, the left and right outer skins, the inner skin mold, the inner skin are integrally installed to form a complete inner and outer mold composite, and then the insulation layer is formed by pouring from the right half outer mold pouring hole 16 and the left half outer mold pouring hole 17;

[0079] S5, demolding, after placing for 24 hours, the mold is disassembled, the left outer skin mold 14 and the left upper and lower joint mold fastening bolt 15 and the right outer skin mold 1 and the right upper and lower joint mold fastening bolt 12 are first disassembled, the entire inner skin mold 2 is ejected or pulled out on the demolding machine, and the product is separated from the mold.

[0080] S6, the recess depth and the layer design are reinforced, the metal nickel mesh and the copper mesh are laid in the middle, the upper and lower outer surfaces of the product are flush after reinforcement, and a complete outer pipe 212 is formed;

[0081] S7, length trimming, two end faces of the outer pipe 212 are processed and trimmed according to design requirements, it is ensured that the two end faces are parallel and perpendicular to the length direction, and the length is processed according to technical requirements, and the manufacturing is completed.

[0082] According to one aspect of the present application, a method for forming the inner pipe is provided, comprising the following steps:

[0083] S1, core mold processing, polishing treatment is performed on the inner pipe forming core mold, and the special demolding agent is brushed and dried;

[0084] S2, the surface of the dried demolding agent is uniformly sprayed with light-proof paint for several times until the demolding agent reaches the required thickness, and then the sprayed product is cured in the oven according to the curing system requirements;

[0085] S3, inner pipe body forming, a plurality of layers of epoxy resin carbon fiber prepreg are laid on the surface of the cured inner pipe, each layer is compacted and flattened, the inner pipe is formed after the number of layers reaches the requirement and is cured by vacuumizing and heating and pressurizing in an autoclave according to a specific curing system, pressure and vacuum degree, and then the inner pipe is processed according to the size after demolding.

[0086] According to one aspect of the present application, a method for assembling the multi-layer multi-functional integrated carbon fiber composite pipe is provided, comprising the following steps:

[0087] S1, material preparation, the inner pipe 211, the outer pipe 212, the double-sided connecting ring 22, the single-sided connecting ring 23, the special adhesive, the carbon fiber epoxy resin for wrapping, the carbon fiber cloth and the metal nickel mesh and copper mesh, the special length measuring tool, the straight line tool, the special assembly platform, the special mechanical polishing tool and the dust collection equipment are prepared;

[0088] S2, the adjacent inner tube 211 and the adjacent outer tube 212 are assembled by the double-sided connecting ring 22 on the special straight tooling and platform, and the axis is kept in the same straight line. Before assembly, the pipe opening is coated with special adhesive for bonding. The bonding surface must be fully coated and cannot be missed. The bonding process ensures that the pipes are closely attached to each other. After bonding, it is cured for 24 hours. A suitable amount of thixotropic agent is added to the adhesive formula to prevent the adhesive from flowing. The adhesive at the bonding site is full. Excess adhesive is wiped off with cotton yarn dipped in acetone.

[0089] S3, the shrinkage zone formed by every two adjacent outer tubes 212 is wrapped with carbon fiber epoxy resin. According to the needs, metal nickel mesh and copper mesh are added in the middle. The wrapped area is at least 0.3mm higher than the outer tube profile. After curing for 24 hours, the excess part is mechanically polished off to make the surface of the whole outer tube smooth and neat. After assembly, it is finished.

[0090] The release agent, demolding machine, and special straight tooling and platform mentioned in the above description are all prior art, and will not be described here.

[0091] The above disclosed embodiments of the application are only used to help explain the application. The embodiments do not describe all the details and do not limit the application to the specific embodiments described. Based on the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application.

Claims

1. A multi-layered multifunctional integrated carbon fiber composite pipe, characterized by, It comprises: The inner and outer skin and sandwich integrated pipe (21) is provided with multiple pipes and is sequentially connected, each inner and outer skin and sandwich integrated pipe (21) comprises an inner pipe (211) and an outer pipe (212) which are nested with each other, and the outer pipe (212) is provided with a reinforcing area (2121) at both ends; The bilateral connecting ring (22) is symmetrical on both sides, each adjacent two inner and outer skin and sandwich integrated pipes (21) are connected through a bilateral connecting ring (22); the bilateral connecting ring (22) comprises a ring seat (221), an inner connecting ring (222), an outer connecting ring (223) and a flange turnup (224), the inner connecting ring (222) and the outer connecting ring (223) are arranged on the ring seat (221), and the flange turnup (224) is arranged on the side of the outer connecting ring (223); during installation, the inner connecting ring (222) is sleeved on the outer wall of the inner pipes (211) on both sides and the pipe openings of the inner pipes (211) on both sides are directly opposite and abut against each other, the outer connecting ring (223) is inserted into the pipe openings of the outer pipes (212) on both sides, and the reinforcing areas (2121) of the outer pipes (212) on both sides form contraction areas with the flange turnup (224); The wrapping material is used for wrapping each contraction area and is flush with the pipe wall of the outer pipe (212); The unilateral connecting ring (23) is half of the bilateral connecting ring (22) and is used for closing the free ends of the inner pipes (211) and the outer pipes (212) of the inner and outer skin and sandwich integrated pipes (21) at the head end and the tail end.

2. The multi-layered multifunctional integrated carbon fiber composite tube according to claim 1, characterized in that: The inner wall of the inner pipe (211) is provided with a light-proof paint coating (2111).

3. The multi-layered multi-functional integrated carbon fiber composite tube according to claim 1, characterized in that: The outer pipe (212) comprises a hard foam sandwich layer and inner and outer carbon fiber composite skins, and the inner and outer carbon fiber composite skins are provided with metal nickel mesh and copper mesh.

4. The multi-layered, multi-functional, integrated carbon fiber composite tube of claim 1, wherein: The wrapping material is carbon fiber epoxy resin.

5. The multi-layered, multi-functional, integrated carbon fiber composite tube of claim 1, wherein: The inner and outer skin and sandwich integrated pipe (21) is in the shape of a triangle, a rhombus, a rectangle or a combination of a triangle and a rectangle.

6. A mold for molding the multi-layered multifunctional integrated carbon fiber composite pipe according to any one of claims 1 to 5, characterized by: It comprises an outer skin mold, an inner skin mold (2), an inner skin (4), a heat preservation layer (5) and an outer skin, the inner skin mold (2) is arranged at the center position and the inner skin (4), the heat preservation layer (5), the outer skin and the outer skin mold are sequentially arranged outward from the center, the outer skin mold comprises right and left symmetrical right outer skin molds (1) and left outer skin molds (14), a seam mold is arranged at the upper part and the lower part between the right outer skin mold (1) and the left outer skin mold (14), a groove is formed between each seam mold and the corresponding outer skin, injection holes which are in communication with the heat preservation layer (5) are arranged at the corresponding positions of the outer walls of the right outer skin mold (1) and the left outer skin mold (14), and the inner walls of the two ends of the outer skin mold along the length direction form necks with the outer skin.

7. A method of using a mold for a multi-layered multi-functional integrated carbon fiber composite pipe according to claim 6, characterized by, It comprises the following steps: S1, combining the right and left outer skin molds, after applying release agent to the seam molds, the right outer skin mold (1) and the left outer skin mold (14) are combined into a complete right and left outer skin mold composite; S2, forming the left and right outer skins, after applying release agent to the inner walls of the right and left outer skin mold composite, the outer skins are laid, and the outer skins are formed according to the performance requirements of the product. S3, inner skin forming, applying release agent to the inner skin mold (2) and laying the inner skin according to the requirements, and then forming the inner skin according to the product performance requirements; S4, insulation layer forming, assembling the right outer skin mold (1), the left outer skin mold (14), the formed left and right outer skins, the inner skin mold together with the formed inner skin to form a complete inner and outer mold composite, and pouring the insulation layer; S5, demolding, separating the product and the mold; S6, reinforcing the groove along the depth direction to achieve reinforcement, laying metal nickel mesh and copper mesh in the middle, and the upper and lower outer surfaces of the product are flush after reinforcement, forming a complete outer tube (212); S7, length trimming, trimming the two end faces of the outer tube (212) according to the design requirements, ensuring that the two end faces are parallel and perpendicular to the length direction, and the length is processed according to the technical requirements, and the production is completed.

8. A method of assembling a multi-layered multi-functional integrated carbon fiber composite pipe according to any one of claims 1 to 5, characterized by, The steps include: S1, material preparation, preparing the inner tube (211), the outer tube (212), the double-sided connecting ring (22), the single-sided connecting ring (23), the special adhesive, the carbon fiber epoxy resin for wrapping, the carbon fiber cloth and metal nickel mesh and copper mesh, the special length measuring tool, the straight tooling, the special assembly platform, the special mechanical polishing tool and the dust collection equipment; S2, assembling adjacent inner tubes (211) and adjacent outer tubes (212) through double-sided connecting rings (22), coating special adhesive on the pipe opening before assembly for bonding, and ensuring close fitting between the pipes during the bonding process, and curing for a certain period of time after bonding; S3, wrapping the shrinkage area formed by every two adjacent outer tubes (212) with carbon fiber epoxy resin, adding metal nickel mesh and copper mesh in the middle as needed, until the wrapping area is higher than the outer tube profile by a certain size, and mechanically polishing the excess part after curing for 24 hours, so that the surface of the whole outer tube is smooth and smooth, and the assembly is completed.

9. The method of claim 8, wherein the multi-layered multi-functional integrated carbon fiber composite pipe is assembled by the steps of: The wrapping area in step S3 is at least 0.3mm higher than the outer tube profile. ​

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