A continuous cyclic layering forming method and production line for large-diameter thermoplastic composite tubular members

Abstract

A kind of continuous circulation layering forming method and production line of large-diameter thermoplastic composite tubular member, belong to the forming technical field of thermoplastic composite tubular member.The method forms initial tubular matrix by inner layer braiding wrapping on core mold, then carries out axial pultrusion fusion and winding enhancement in turn, and according to target wall thickness, repeats the above pultrusion-winding cycle to form circulation layering structure;Subsequently, outer layer braiding coating and low-pressure shaping are carried out on the outside of the tubular member.The production line includes inner layer braiding coating unit, axial pultrusion unit, winding enhancement unit, circulation layering unit, outer layer braiding coating unit and low-pressure shaping unit arranged along the traction direction.The present application utilizes the characteristics of thermoplastic composite reinforcement material that can be heated and fused again, realizes continuous layering of large-diameter tubular member, adjustable wall thickness and size stability control, has the advantages of good forming continuity, high production efficiency, stable interlayer fusion quality and adaptability to different wall thickness specifications.

Description

Technical Field

[0001] This invention belongs to the technical field of thermoplastic composite cylindrical components, and particularly relates to a continuous cyclic layering molding method and production line for large-diameter thermoplastic composite cylindrical components. Background Technology

[0002] Cylindrical components in marine engineering, aerospace, underground pipelines, chemical transportation, and pressure vessels typically need to withstand multi-directional composite loads and complex service environments such as corrosive media and temperature changes, placing high demands on their lightweight, high load-bearing capacity, corrosion resistance, impact resistance, and long service life. Composite materials possess advantages such as high specific strength, high specific stiffness, corrosion resistance, fatigue resistance, and strong designability, enabling them to improve the service reliability and environmental adaptability of cylindrical components while reducing structural weight, thus holding significant application value in these fields. Among composite material systems, thermoplastic composites do not rely on the irreversible curing reaction of traditional thermosetting composites. They feature melt-processing, heat-welding, short molding cycles, potential for local repair after damage, and recyclability of waste materials, making them more in line with the development needs of high-efficiency manufacturing, green manufacturing, and sustainable engineering applications. As related engineering equipment develops towards larger sizes, greater complexity, and greater diversity, different application scenarios place different requirements on the wall thickness specifications and overall performance of cylindrical components. Molding methods with a single fixed wall thickness are insufficient to accommodate the continuous production of multi-specification products. Therefore, achieving continuous, efficient, and high-quality molding of multi-specification, large-diameter thermoplastic composite cylindrical components on a single production line has significant engineering application value.

[0003] Existing molding processes for composite cylindrical components mainly include pultrusion, filament winding, and combinations thereof. Pultrusion offers good continuity and significant axial reinforcement, but the reinforcement direction is relatively singular. Filament winding can form circumferential or oblique reinforced structures, but it requires numerous lay-up steps and a long molding cycle due to the layer-by-layer winding process. Therefore, cylindrical components typically require a combination of processes to meet the demands for multi-directional reinforcement and continuous molding. While existing pultrusion-filament winding combinations can achieve these requirements, their adaptability to large-diameter thermoplastic cylindrical components remains significantly limited.

[0004] For pultrusion winding of large-diameter thermoplastic composite cylindrical components, the large circumference of the components and the long material layup path require simultaneous assurance of continuous reinforcement, heating and bonding of the thermoplastic matrix, interlayer interface fusion, and initial cylindrical structure stability during the molding process. Therefore, large-diameter cylindrical components require a stable cylindrical matrix as a foundation for traction and layering in the early stages of molding. Furthermore, the large dimensions of the thermoplastic materials used mean that without effective circumferential constraints and tension traction, axial and wound materials are prone to localized misalignment, slippage, or loosening during molding, affecting the quality of subsequent layering. Simultaneously, when the cylindrical component has a large wall thickness, the lack of staged layering and dimensional accuracy control can easily lead to insufficient interface fusion quality, difficulty in expelling interlayer air, and poor dimensional stability. In addition, the increasing complexity of application scenarios necessitates the preparation of products with different wall thicknesses. Existing processes often require adjustments to the process route or changes to equipment configuration when preparing products with different wall thicknesses, making it difficult to efficiently prepare large-diameter thermoplastic composite cylindrical components with various wall thicknesses on a single continuous production line. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a continuous cyclic layering molding method and production line for large-diameter variable-wall-thickness thermoplastic composite cylindrical components, which enables continuous, high-efficiency, and adjustable-wall-thickness molding of large-diameter thermoplastic composite cylindrical components.

[0006] The technical solution of this invention: A continuous cyclic layering molding method for large-diameter thermoplastic composite cylindrical components, comprising the following steps: 1) Continuously cover the surface of the core mold or inner mold with thermoplastic braided material to form an initial cylindrical matrix; 2) Thermoplastic material is continuously introduced into the axial pultrusion fusion process along the axial direction, so that it is heated and bonded to the initial cylindrical matrix to form a two-layer cylindrical component structure containing a braided layer and a pultruded layer; 3) A continuous winding reinforcement material is used on the outside of the two-layer cylindrical component structure to form a three-layer cylindrical component structure containing a braided layer, a pultruded layer and a winding reinforcement layer; 4) After completing one axial pultrusion fusion and winding reinforcement, determine whether the required wall thickness has been achieved according to the target wall thickness and performance requirements. If it has been achieved, proceed to step 5); if not, proceed to step 1) and continue the cycle until the predetermined wall thickness is achieved. 5) The outer side of the cylindrical component that has reached the predetermined wall thickness is covered with thermoplastic braided material, and the cylindrical component is put into the low-pressure conformal zone to stabilize and control the outer diameter, roundness and surface condition of the cylindrical component.

[0007] The proposed method differs from existing processes in that: 1) In the above molding process, the thermoplastic composite reinforcing material is heated to a bondable or fusionable state, and undergoes thermal bonding and interfacial fusion with the already formed cylindrical structure; the reinforcing structure formed in the subsequent cycle and the cylindrical structure formed in the previous cycle achieve interfacial bonding through reheating. The molding process does not primarily rely on liquid resin impregnation and curing reactions, but rather on the heating softening, melting bonding, and shape retention after cooling of the thermoplastic resin matrix as the main molding mechanism.

[0008] 2) The thermoplastic braided material is disposed on the inner and outer sides of the cylindrical component. The inner braided material is used to form the initial cylindrical matrix, improving the integrity and continuous traction stability of the large-diameter cylindrical component in the early stage of molding; the outer braided material is used to form a circumferential constraint on the cylindrical component structure, reducing the loosening, warping, or local opening of the outer layer material during the subsequent shape preservation and traction process.

[0009] 3) The axial thermoplastic composite material continuously enters the pultrusion region along the axial direction of the cylindrical component and adheres to the already formed cylindrical matrix or the reinforcing structure formed in the previous cycle. As the main component for the wall thickness increase of the cylindrical component, this axial pultrusion structure can ensure the overall quality and performance of the cylindrical component, reduce the number of repeated lay-up steps required by simply relying on winding to increase the thickness layer by layer, and improve the molding efficiency of large-diameter cylindrical components.

[0010] 4) The wound reinforcement material is continuously laid on the outside of the axially pultruded structure. The winding angle is set according to the service load requirements of the cylindrical component, and can be circumferential winding, oblique winding, or a combination of angle winding. The wound reinforcement structure is used to supplement the circumferential or oblique load-bearing capacity of the cylindrical component and together with the axially pultruded structure, forms a multi-directional reinforcement structure for the cylindrical component.

[0011] 5) The number of pultrusion-winding cycles is determined based on the target wall thickness and load-bearing capacity of the cylindrical component. When the required wall thickness is small, the number of cycles is reduced; when the required wall thickness is large, the number of cycles is increased. By adjusting the number of cycles, the wall thickness of the cylindrical component can be adjusted, enabling the method proposed in this invention to adapt to the continuous production of large-diameter thermoplastic composite cylindrical components of different specifications.

[0012] Based on the clearly defined methods and processes, this invention further designs a continuous cyclic layering molding production line for implementing the above methods. Along the processing direction of the cylindrical component, it sequentially includes a core mold, an inner braided covering unit, an axial pultrusion fusion unit, a winding reinforcement unit, a cyclic layering unit, an outer braided covering unit, a low-pressure conformal forming unit, and a traction unit. The traction unit is used to drive the core mold or the cylindrical structure obtained by each processing process to continuously advance along the axial direction, so that each functional structure is formed sequentially online.

[0013] The mandrel starts at the front of the production line and runs throughout the entire line. It supports the initial molding process of large-diameter thermoplastic composite cylindrical components and provides a continuous molding reference for subsequent inner layer braiding, axial pultrusion fusion, and winding reinforcement. The mandrel works in conjunction with the traction unit to enable the cylindrical component or the cylindrical matrix obtained by each processing process to move stably along the axial direction.

[0014] The inner braided covering unit is located on the outer periphery of the mandrel and upstream of the axial pultrusion fusion unit, and is used to form the initial cylindrical matrix.

[0015] Furthermore, the inner braided covering unit includes a guiding structure and an open-type guiding mold. The guiding structure is used for the initial guidance, flattening and positional constraint of the material, reducing its deviation, curling or wrinkling before entering the mandrel. The open-type guiding mold is used to guide the material after the guiding structure to the surface of the mandrel, so that it gradually transitions into a cylindrical covering state that fits the outer periphery of the mandrel, obtaining an initial cylindrical matrix, and providing a stable wrapping structure for subsequent stages.

[0016] The axial pultrusion fusion unit is located downstream of the inner braided covering unit and is used to receive the initial cylindrical matrix from upstream and the thermoplastic material continuously supplied along the axial direction of the cylindrical member.

[0017] Furthermore, the axial pultrusion fusion unit includes a guide structure and a pultrusion die. The guide structure is used for the initial guidance, flattening and positional constraint of the thermoplastic material. The pultrusion die is fitted around the periphery of the formed initial cylindrical substrate to heat-fit and fuse the thermoplastic material with the existing initial cylindrical substrate.

[0018] The winding reinforcement unit is located downstream of the axial pultrusion fusion unit. The winding reinforcement unit includes several winding machines and corresponding heating devices. The winding machines are used to continuously lay the winding reinforcement material on the outside of the cylindrical component structure after axial pultrusion fusion to form a circumferential or oblique reinforcement structure. The corresponding heating devices are located near the winding bonding position and are used to heat the winding material and the surface of the cylindrical substrate.

[0019] The cyclic build-up unit includes at least one set of axially pultruded fusion units and winding reinforcement units, or includes a continuously arranged region capable of repeating the axial pultrusion and winding reinforcement steps. As the cylindrical member passes through the cyclic build-up unit, a new set of axially pultruded fusion structures and winding reinforcement structures are formed on its outer side with each pultrusion-winding cycle, thereby gradually increasing the wall thickness of the cylindrical member.

[0020] The outer braided covering unit is located downstream of the cyclic layering unit and is used to continuously cover the outside of the cylindrical component with thermoplastic braided material after a predetermined number of cyclic layerings, forming an outer braided covering structure.

[0021] Furthermore, the unit includes a guide structure and a wrapping mold, the wrapping mold being used to heat the outer layer thermoplastic braided material and the outer surface of the tubular component, and the guide structure being used to guide and adhere the outer layer braided material to the outer surface of the tubular component.

[0022] The low-pressure conformal unit is located downstream of the outer braided covering unit and includes a low-pressure conformal mold. It is used to receive the large-diameter thermoplastic composite cylindrical component after the outer braided covering is completed, and to stably control the outer diameter, roundness and surface condition of the cylindrical component under continuous traction.

[0023] The traction unit is located at the end of the production line and is used to continuously move the cylindrical substrate or the formed cylindrical component obtained by each processing process forward along the axial direction.

[0024] Preferably, the production line should also include a material supply unit, a tension adjustment unit, and a heating auxiliary unit. The material supply unit is used to continuously supply the corresponding materials to each unit; the tension adjustment unit is used to adjust the tension state of various materials before they enter the corresponding molding stage, so that the materials remain flat, stable, and continuous, reducing deviation, curling, or wrinkles; the heating auxiliary unit is used to cooperate with the axial pultrusion, winding reinforcement, and outer layer braiding and covering processes, so that the thermoplastic composite material and the formed cylindrical structure can reach a state where they can be bonded or fused.

[0025] Preferably, the molding units are arranged in series along the traction direction of the cylindrical component, with the cylindrical structure formed in the previous unit directly entering the next unit. The initial cylindrical matrix formed by the inner braiding and covering unit directly enters the axial pultrusion fusion unit; the pultruded structure formed by the axial pultrusion fusion unit then enters the winding reinforcement unit; the winding reinforcement structure formed by the winding reinforcement unit continues to enter the next cycle of the axial pultrusion fusion unit or enters the outer braiding and covering unit; the outer covering structure formed by the outer braiding and covering unit finally enters the low-pressure conformal forming unit. Through the above continuous connection relationship, online continuous cyclic layering molding of large-diameter thermoplastic composite cylindrical components can be realized.

[0026] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention provides a continuous cyclic layering molding method and production line for large-diameter thermoplastic composite cylindrical components. By continuously arranging the inner layer braiding, axial pultrusion fusion, winding reinforcement, cyclic layering, outer layer braiding, and low-pressure shape retention along the traction direction, this method enables the cylindrical component to sequentially complete the initial matrix establishment, axial thickening, circumferential or oblique reinforcement, outer layer constraint, and dimensional shape retention on the same production line, achieving efficient continuous production of large-diameter cylindrical structures. Each functional unit is modularly designed and can be combined or repeatedly configured according to the target wall thickness and performance requirements. Furthermore, by adjusting the number of pultrusion-winding cyclic layering layers, large-diameter thermoplastic composite cylindrical components with different wall thicknesses can be prepared, reducing the dependence on individual process routes, special equipment configurations, and repeated clamping and positioning when producing multi-specification products, and improving the modular expansion capability, continuous production capability, and multi-specification product adaptability of the production line.

[0027] (2) The present invention adopts a cyclic layering method of alternating axial pultrusion and winding reinforcement, so that each cycle can form a new axial pultrusion fusion structure and winding reinforcement structure on the outside of the existing cylindrical structure. This cyclic process can decompose the molding process of thick-walled components into multiple continuous layering processes, reduce the heat transfer distance, interface fusion difficulty and interlayer venting pressure in a single thickening process, and improve the bonding and fusion quality of thermoplastic materials at each layering interface; at the same time, the number of axial pultrusion fusion and winding reinforcement layers in a single cycle can be appropriately adjusted according to the target wall thickness, load-bearing capacity and reinforcement layer requirements of the cylindrical component, so as to achieve a balance of wall thickness growth efficiency, axial load-bearing capacity, circumferential or oblique reinforcement effect and overall structural performance of the cylindrical component, which is conducive to improving the molding efficiency, interlayer bonding quality and comprehensive performance of large-diameter thermoplastic composite cylindrical components.

[0028] (3) To address the problems of insufficient support, long material laying path, and easy instability of hot structure in the early stage of forming large-diameter cylindrical components, this invention sets woven covering structures on the inner and outer sides of the cylindrical component. The inner woven covering structure is used to form a stable initial tubular matrix, providing a support foundation for subsequent continuous traction and cyclic layering; the outer woven covering structure is used to form an overall constraint on the external reinforcement structure after cyclic layering, reducing the loosening, warping, or local opening of the outer material. Furthermore, a low-pressure conformal process is set at the end to control the outer diameter, roundness, and surface condition of the cylindrical component after layering and outer covering, improving the dimensional accuracy and surface quality of the large-diameter cylindrical component without applying excessive disturbance to the outer reinforcement structure.

[0029] (4) This invention utilizes the characteristics of thermoplastic resin matrix that can be heated to soften and re-fuse, so that the newly added thermoplastic composite reinforcement material and the already formed cylindrical structure undergo thermal bonding and interfacial re-fusion in each pultrusion-winding cycle. This molding mechanism differs from the traditional thermosetting composite material method that relies on impregnation and curing reaction to form the structure. It can adapt to multiple layering, interfacial re-bonding and wall thickness adjustment under continuous traction conditions, and is more suitable for continuous, adjustable wall thickness and high-quality molding of large-diameter thermoplastic composite cylindrical components.

[0030] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0032] Figure 1 This is a schematic diagram of the continuous cyclic layering molding method for large-diameter thermoplastic composite cylindrical components described in this embodiment of the invention; Figure 2 This is a schematic diagram of the overall layout of the continuous cyclic layering molding production line for large-diameter thermoplastic composite cylindrical components described in this embodiment of the invention. Figure 3 This is a schematic diagram of the axial pultrusion-winding reinforced cyclic layering process described in an embodiment of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the axial pultrusion-winding reinforced cyclic layering process described in an embodiment of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the cross-sectional layer structure of the large-diameter thermoplastic composite cylindrical component described in an embodiment of the present invention; Figure 2 In the middle: 1. Core mold, 2. Open-type guide mold, 3. Pultrusion mold, 4. Winding machine, 5. Circulating layering unit, 6. Wrapping mold, 7. Low-pressure conformal mold, 8. Traction unit; Figure 3 In the middle: 4-1. First winding machine, 4-2. Second winding machine, 4-3. Feeding tray, 4-4. Motor, 10. Guide structure, 12-1. Pultrusion heating auxiliary unit; Figure 4 In the middle section: 9. Material supply unit, 11-1. Pultrusion tension adjustment unit, 11-2. Winding tension adjustment unit, 12-2. Winding heating auxiliary unit; Figure 5In the middle: 13-1. Inner braided layer, 13-2. Pultruded layer, 13-3. Winding reinforcement layer, 13-4. Pultruded winding cycle layer; 13-5. Outer braided layer. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0037] The purpose of this embodiment is to provide a continuous cyclic layering production line for large-diameter, variable-wall-thickness thermoplastic composite cylindrical components.

[0038] like Figure 2 As shown, the continuous cyclic layering molding production line provided in this embodiment includes a core mold 1, an open-type guide mold 2, a pultrusion mold 3, a winding machine 4, a cyclic layering unit 5, a wrapping mold 6, a low-pressure conforming mold 7, and a traction unit 8 arranged sequentially along the processing direction of the cylindrical component. The inner layer thermoplastic braided material is guided by the open-type guide mold 2 and then wrapped around the outer periphery of the core mold 1 to form an initial cylindrical substrate; it is then cyclically layered through the pultrusion mold 3 and the winding machine 4; subsequently, the outer layer covering structure is formed through the wrapping mold 6, and the low-pressure conforming mold 7 is used to maintain its shape. The traction unit 8 is used to drive the cylindrical structure to move continuously along the axial direction of the core mold 1.

[0039] Furthermore, such as Figure 3 and Figure 4As shown, the winding machine 4 includes a first winding machine 4-1 and a second winding machine 4-2. The first winding machine 4-1 and the second winding machine 4-2 are respectively equipped with a feeding tray 4-3 and a motor 4-4. The feeding tray 4-3 is used to continuously lay winding reinforcement materials in different directions on the outside of the pultruded cylindrical structure. A winding tension adjustment unit 11-2 is located between the winding machine 4 and the feeding tray 4-3. Driven by the motor 4-4, the winding machine 4 conveys the material in the feeding tray 4-3 to the structural component via the winding tension adjustment unit 11-2. The material supply unit 9 is used to continuously supply thermoplastic material to the corresponding molding stage. The guide structure 10 is used to flatten and position the thermoplastic material and the reinforcing material. The pultrusion tension adjustment unit 11-1 is installed on the material supply unit 9. The material supply unit 9 enables the thermoplastic material to be pultruded and fused to the structural part under the pultrusion tension adjustment unit 11-1 and the guide structure 10. The pultrusion heating auxiliary unit 12-1 and the winding heating auxiliary unit 12-2 are used for heating in the corresponding stages, respectively.

[0040] Furthermore, such as Figure 5 As shown, the molded cylindrical component comprises, from the inside out, an inner braided layer 13-1, at least one set of pultruded-wound cyclic layers 13-4, and an outer braided layer 13-5. Each set of pultruded-wound cyclic layers 13-4 includes a pultruded layer 13-2 and a wound reinforcing layer 13-3. By adjusting the number of pultruded-wound cyclic layers 13-4, thermoplastic composite cylindrical components with different wall thicknesses can be formed.

[0041] The above embodiment provides a method for continuous cyclic layering of large-diameter, variable-wall-thickness thermoplastic composite cylindrical components, which has broad application prospects.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous cyclic layering molding method for large-diameter thermoplastic composite cylindrical components, characterized in that: After the inner layer is woven and wrapped around the core mold to form an initial cylindrical matrix, axial pultrusion fusion and winding reinforcement are performed in sequence, and the axial pultrusion fusion and winding reinforcement are repeated according to the target wall thickness to form a cyclic layered structure. Subsequently, an outer layer of braided coating and low-pressure conformal shaping are applied to the outside of the cylindrical component after the cyclic layering is completed, resulting in a large-diameter thermoplastic composite cylindrical component.

2. The continuous cyclic layering molding method for a large-diameter thermoplastic composite cylindrical component as described in claim 1, characterized in that: The axial pultrusion fusion and winding reinforcement constitute a cyclic layering process. After each cyclic layering process is completed, a set of axial pultrusion fusion structures and winding reinforcement structures are formed on the outside of the cylindrical component. The wall thickness of the cylindrical component is controlled by adjusting the number of repetitions of the cyclic layering process.

3. The continuous cyclic layering molding method for a large-diameter thermoplastic composite cylindrical component as described in claim 1, characterized in that: Both the axially pultruded fusion structure and the spiral wound reinforced structure are formed by heating thermoplastic composite materials. In the subsequent layering process, the newly added thermoplastic composite reinforcing material and the cylindrical structure formed in the previous cycle are thermally bonded and fused at the interface through reheating.

4. The continuous cyclic layering molding method for a large-diameter thermoplastic composite cylindrical component as described in claim 1, characterized in that: Both the inner and outer braids are made of thermoplastic braiding reinforcement material. The inner thermoplastic braiding reinforcement material is used to form a continuous traction foundation and a circumferential support foundation. The outer thermoplastic braiding reinforcement material is used to form a continuous constraint on the outside of the cylindrical component after the cyclic layering is completed. The low-pressure conformal shaping is used to stably control the outer diameter, roundness and surface condition of the cylindrical component.

5. A continuous cyclic layering molding production line for realizing the method of any one of claims 1 to 4 for large-diameter thermoplastic composite cylindrical components, characterized in that: It includes an inner braided covering unit, an axial pultrusion fusion unit, a winding reinforcement unit, a cyclic layering unit, an outer braided covering unit, and a low-pressure conformal unit arranged along the traction direction of the cylindrical component; the cyclic layering unit is used to repeatedly form a cyclic layering structure by having the axial pultrusion fusion unit and the winding reinforcement unit repeat.

6. The continuous cyclic layering molding production line for large-diameter thermoplastic composite cylindrical components as described in claim 5, characterized in that: The mandrel starts at the front end of the production line and runs through the entire production line. It is used to support the initial molding process of large-diameter thermoplastic composite cylindrical components and to provide a continuous molding reference for subsequent inner layer braiding, axial pultrusion fusion and winding reinforcement. The mandrel works in conjunction with the traction unit to enable the cylindrical component or the cylindrical matrix obtained by each processing process to move stably along the axial direction. The inner braided covering unit is located on the outer periphery of the mandrel and upstream of the axial pultrusion fusion unit, and is used to form the initial cylindrical matrix; The axial pultrusion fusion unit is located downstream of the inner braided covering unit and is used to receive the initial cylindrical matrix from the upstream and the thermoplastic material continuously supplied along the axial direction of the cylindrical member. The winding reinforcement unit is located downstream of the axial pultrusion fusion unit. The winding reinforcement unit includes several winding machines and corresponding heating devices. The winding machines are used to continuously lay the winding reinforcement material on the outside of the cylindrical component structure after axial pultrusion fusion to form a circumferential or oblique reinforcement structure. The corresponding heating devices are located near the winding bonding position and are used to heat the winding material and the surface of the cylindrical substrate. The cyclic layering unit includes at least one set of axial pultrusion fusion units and winding reinforcement units, or includes a continuously arranged region that enables the axial pultrusion step and the winding reinforcement step to be repeated; when the cylindrical member passes through the cyclic layering unit, a new set of axial pultrusion fusion structures and winding reinforcement structures are formed on its outer side each time it goes through a pultrusion-winding cycle, thereby gradually increasing the wall thickness of the cylindrical member. The outer braided covering unit is located downstream of the cyclic layering unit and is used to continuously cover the outside of the cylindrical component with thermoplastic braided material after a predetermined number of cyclic layerings, forming an outer braided covering structure. The low-pressure conformal unit is located downstream of the outer braided covering unit and includes a low-pressure conformal mold. It is used to receive the large-diameter thermoplastic composite cylindrical component after the outer braided covering is completed, and to stably control the outer diameter, roundness and surface condition of the cylindrical component under continuous traction. The traction unit is located at the end of the production line and is used to continuously move the cylindrical substrate or the formed cylindrical component obtained by each processing process forward along the axial direction.

7. The continuous cyclic layering molding production line for large-diameter thermoplastic composite cylindrical components as described in claim 5, characterized in that: The production line also includes a guide flattening structure, a tension adjustment structure, and a heating structure. The guide flattening structure and the tension adjustment structure are used to maintain the flatness and stability of the large-sized thermoplastic composite material when it enters the corresponding molding stage. The heating structure is used to make the thermoplastic composite material and the formed cylindrical structure fit together or fuse.

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