A carbon fiber thermoplastic prepreg infiltration composite device

Abstract

The present invention discloses a carbon fiber thermoplastic prepreg melt infiltration composite device, belonging to the field of thermoplastic prepreg melt infiltration technology. The device comprises a preheating and positioning zone, a heating and melt infiltration zone, and a post-processing and molding zone, which are sequentially arranged. The preheating and positioning zone is provided with multiple sets of roller assemblies to preheat the prepreg and apply it to the surface of the carbon fiber fabric to achieve positioning. The heating and melt infiltration zone is provided with a special-shaped planar cavity, and cylindrical rollers are provided on both sides of the special-shaped planar cavity to achieve rapid melt infiltration and composite of the prepreg. The post-processing and molding zone includes a cooling roller assembly and a needle device, which are sequentially arranged to achieve gas removal between the prepreg bundles and achieve dense molding between the prepreg layers. The device can achieve rapid melt infiltration and composite molding of thermoplastic resin film and carbon fiber flat fabric structure, and can effectively improve the melt infiltration effect of resin within the fiber.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoplastic prepreg infiltration, and in particular relates to a carbon fiber thermoplastic prepreg infiltration composite device. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Thermoplastic resin matrices have the excellent property of being able to be repeatedly heated and plasticized. Based on this property, they can be reinforced with continuous carbon fiber filaments or two-dimensional or three-dimensional carbon fiber fabrics to produce thermoplastic composite products with high strength, high toughness, high stiffness, and the ability to be quickly formed and repeatedly plasticized. Due to the short molding time and excellent fatigue and aging resistance of thermoplastic composite products in long-term service, they have become a highly promising alternative to traditional thermosetting resin-based carbon fiber composites and have been rapidly developed. As a key intermediate raw material in the molding and processing of thermoplastic composites, carbon fiber thermoplastic prepreg has been rapidly developed and researched in recent years in the fields of industry, agriculture, transportation, and aerospace.

[0004] In order to meet the design requirements of different products, the continuous filaments of the fibers in the thermoplastic carbon fiber prepreg are often formed into a fabric structure arranged in different directions by widening or weaving. Different structural forms such as unidirectional arrangement, two-dimensional arrangement or multi-axial arrangement can be formed and then composited with the thermoplastic resin matrix. However, since the thermoplastic resin is in a solid state at room temperature and has high viscosity, poor fluidity, low inter-beam permeability and interface affinity during heating and fiber composite process, the impregnation composite of the thermoplastic prepreg becomes the main technical difficulty that limits the comprehensive characteristics of the thermoplastic prepreg. In order to solve this problem, researchers often use solution composite, powder impregnation and other methods to improve the impregnation effect of thermoplastic resin and carbon fiber, but these methods often bring about process or technical additional problems such as difficult to remove solvents and too high powder crushing costs. The heated melt infiltration method has always been the traditional and mature preparation method of thermoplastic carbon fiber prepreg, and the heated melt infiltration often uses thermoplastic resin granular raw materials or sliced ​​raw materials. During the impregnation process with the fiber, the melt infiltration device will be blocked due to the high viscosity of the resin at high temperature, which requires a huge cost increase due to cleaning equipment or equipment scrapping.

[0005] In order to avoid the occurrence of this problem, researchers processed thermoplastic resin into a film of a certain thickness, and after applying a certain amount of film-like resin matrix on the surface of carbon fiber unidirectional or multidirectional fabric, composite molding was carried out by heating and melt infiltration, which can effectively improve the impregnation effect of resin and carbon fiber bundles. However, this method also has its shortcomings. Since the melting of thermoplastic resin film and its flow inside the fiber bundle are natural infiltration, there is a lack of pressure difference along the thickness direction of the fiber plane fabric, which leads to the impregnation time of the resin film melting process being too long, resulting in reduced production efficiency. In addition, in this method, the resin needs to penetrate from the surface of the fabric to the inside, and it is inevitable that the resin is unevenly distributed inside the fiber. Therefore, there is an urgent need to design or optimize an efficient melt infiltration device that improves the continuous impregnation and composite of resin film and carbon fiber fabric to match the production of thermoplastic carbon fiber prepregs. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a carbon fiber thermoplastic prepreg melt infiltration composite device, which can realize the rapid melt infiltration composite molding of thermoplastic resin film and carbon fiber flat fabric structure, and can effectively improve the melt infiltration effect of resin inside the fiber.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, the present invention provides a carbon fiber thermoplastic prepreg melt infiltration composite device, comprising a preheating positioning zone, a heating melt infiltration zone and a post-processing molding zone arranged in sequence; the preheating positioning zone is provided with multiple groups of roller assemblies to preheat the prepreg and apply it to the surface of the carbon fiber fabric and realize positioning; a special-shaped plane cavity is provided inside the heating melt infiltration zone, and cylindrical rollers are provided on both sides of the special-shaped plane cavity to realize rapid melt infiltration composite of the prepreg; the post-processing molding zone includes a cooling roller assembly and a needle device arranged in sequence to realize the removal of gas between the bundles of the prepreg and achieve dense molding between the prepreg layers.

[0009] As a further technical solution, the gap between the roller assemblies is adjustable. Each set of roller assemblies includes two rollers arranged opposite to each other, and heating elements are arranged inside the rollers. The rotation direction of the roller assemblies is consistent with the transmission direction of the prepreg.

[0010] As a further technical solution, the preheating working temperature of the roller surface of the roller assembly is within the range of 5-20°C lower than the hot melt flow temperature of the prepreg; the surface working temperature of each group of roller assemblies is set in a gradient.

[0011] As a further technical solution, the pressurization pressure of the roller assembly is in the range of 0.5-5 MPa; the pressure of each group of roller assemblies is set in a gradient.

[0012] As a further technical solution, the upper roller of the first-stage roller assembly is cylindrical and the lower roller is a spindle-shaped roller; the upper roller of the second-stage roller assembly is spindle-shaped and the lower roller is cylindrical; the upper and lower rollers of the remaining roller assemblies are both cylindrical.

[0013] As a further technical solution, the special-shaped planar cavity has a wavy axial section for the carbon fiber fabric coated with the film resin to pass through.

[0014] As a further technical solution, cylindrical rollers are provided at the wave troughs on both sides of the special-shaped plane cavity, and the rotation direction of the cylindrical rollers is opposite to the transmission direction of the prepreg.

[0015] As a further technical solution, heaters are provided on both sides of the special-shaped planar cavity, and the heating temperature is within a range of 2-10° C. higher than the hot melt flow temperature of the prepreg.

[0016] As a further technical solution, the cooling roller assembly includes two rollers facing each other up and down, a heating device is provided inside the rollers, and the surface temperature of the rollers is lower than the hot melt flow temperature of the prepreg.

[0017] As a further technical solution, the needle device includes an upper needle plate and a lower eyelet table arranged relatively to each other, and the upper needle plate and the lower eyelet table can move back and forth relatively to each other. The upper needle plate is provided with a single row of needles, and the lower eyelet table is provided with a single row of needle hole plates.

[0018] The beneficial effects of the present invention are as follows:

[0019] The melt infiltration composite device of the present invention adopts multiple sets of heating rollers in the preheating and shaping zone to preheat the prepreg and apply it to the surface of the carbon fiber fabric to achieve positioning; the heating melt infiltration zone realizes rapid melt infiltration and composite of the prepreg through the design of a special-shaped plane cavity; the post-processing molding zone realizes the removal of gas between bundles of thermoplastic prepreg by combining a cooling roller assembly with a high-frequency needle device, and finally achieves dense molding between the prepreg layers.

[0020] The melt infiltration composite device of the present invention can be assembled after the carbon fiber unidirectional arrangement processing device, the multidirectional fabric processing device and various widened carbon fiber unidirectional (multidirectional) processing devices and form a continuous processing system therewith, thereby realizing the rapid melt infiltration composite molding of thermoplastic resin film and carbon fiber planar fabric structure, which can effectively improve the melt infiltration effect of resin inside the fiber and improve the stable production level and product quality of prepreg. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 Schematic diagram of a carbon fiber thermoplastic prepreg melt infiltration composite device according to one or more embodiments of the present invention;

[0023] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the diagram is for illustration only;

[0024] Among them, 1 is a preheating and positioning area, 2 is a heating and infiltration area, 3 is a post-processing and forming area, 4 is a pair of roller assemblies, 5 is a cylindrical roller body, 6 is a special-shaped plane cavity, 7 is a cooling pair of roller assemblies, and 8 is a high-frequency needle device. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0026] In a typical embodiment of the present invention, Figure 1 As shown, a carbon fiber thermoplastic prepreg melt infiltration composite device is proposed, which can be used in a continuous carbon fiber thermoplastic prepreg production equipment line.

[0027] The device includes three parts: a preheating and positioning area 1, a heating and infiltration area 2, and a post-processing molding area 3. The preheating and positioning area 1 is provided with multiple groups of roller assemblies 4 to realize the preheating and application of prepreg (such as film resin) to the surface of the carbon fiber fabric and realize positioning; multiple groups of cylindrical rollers 5 and special-shaped plane cavities 6 with wavy axial sections are arranged inside the heating and infiltration area 2, and the resin film is quickly infiltrated and composited through the special-shaped plane cavity; the post-processing molding area 3 is composed of a cooling roller assembly 7 and a high-frequency needle device 8 to realize the removal of gas between the bundles of the thermoplastic prepreg, and finally achieve dense molding between the prepreg layers.

[0028] After the prepreg is preheated and applied to the surface of the carbon fiber fabric in the preheating positioning zone 1, it is transported to the heating and melting infiltration zone 2. After the prepreg is quickly melt-infiltrated and compounded in the heating and melting infiltration zone 2, it is transported to the post-processing molding zone 3. The post-processing molding zone 3 removes the gas between the bundles of the prepreg; the transportation between the zones can be carried out in the form of pulling.

[0029] Specifically, the preheating and positioning area 1 consists of 3-5 pairs of roller assemblies 4 with controllable gaps. Each pair of roller assemblies 4 includes two opposing rollers, which can be made of chrome-plated alloy steel. The roller assemblies are heated by circulating thermal oil or using electric heating elements within the rollers, both of which are conventional methods. The preheating operating temperature of the roller surfaces is controlled within a range of 5-20°C below the melt flow temperature of the resin. The pressurization pressure of the roller assemblies is controlled within a range of 0.5-5 MPa.

[0030] The surface working temperature of each roller assembly is designed with a gradient configuration according to the number of components and the preheating working temperature requirements of the roller surface. The first-level roller assembly is preferably controlled at 15-20℃ lower than the lower limit of the resin hot melt flow temperature; the second-level roller assembly is preferably controlled at 10-15℃ lower than the lower limit of the resin hot melt flow temperature; the third-level roller assembly is preferably controlled at 5-10℃ lower than the lower limit of the resin hot melt flow temperature; the temperature setting of the roller assembly of subsequent levels can be flexibly adjusted according to the process, preferably within the range of 2-5℃ lower than the lower limit of the resin hot melt flow temperature.

[0031] The pressure of the roller assembly is also designed with a gradient configuration, where the pressure of the first-stage roller assembly is controlled within the range of 1-5MPa, and the pressure configuration of other components can be floatingly adjusted based on the pressure data of the first-stage assembly.

[0032] The rollers of the first-stage roller assembly are cylindrical in shape, with the lower rollers being spindle-shaped. The second-stage roller assembly features a spindle-shaped upper roller and cylindrical lower roller. Subsequent roller assemblies all adopt a combination of upper and lower cylindrical rollers. The roller diameter can be flexibly designed within a range of 10-50cm. The roller length is determined by the required prepreg width plus 20cm.

[0033] The rotation speed and direction of the roller assembly are synchronized with the overall transmission of the prepreg production.

[0034] Specifically, the heating and infiltration zone 2 is provided with a special-shaped plane cavity 6, which has a wavy axial section. The special-shaped plane cavity 6 can be formed by two upper and lower plates both having S-shaped surfaces for the carbon fiber fabric coated with thin film resin to pass through; the axial section wavy special-shaped plane cavity design is adopted, the cavity length is controlled within the range of 40-200cm, and the cavity width is designed to be 40-60cm higher than the prepreg width requirement.

[0035] Cylindrical rollers 5 are provided at the wave troughs on both sides of the irregular planar cavity 6. The two cylindrical rollers, tilted and facing each other on both sides of the irregular planar cavity 6, can be grouped together, and the number of groups can be flexibly adjusted according to design requirements. The cylindrical rollers rotate in a direction opposite to the overall transmission direction of the prepreg.

[0036] The heating and infiltration zone adopts far-infrared heating. Far-infrared heaters can be set on both sides of the special-shaped plane cavity 6. The heating temperature is controlled within the range of 2-10°C higher than the resin hot melt flow temperature, and the temperature fluctuation is no more than ±0.5°C.

[0037] Specifically, the post-processing molding area 3 includes a group of cooling roller assemblies 7 and a high-frequency needle device 8. The cooling roller assembly 7 includes two rollers facing each other up and down. A heating device is set in the roller, which can be heated by electricity. The surface of the cooling roller assembly 7 is set to a certain temperature for heating, and its surface temperature is preferably 10°C lower than the hot melt flow temperature of the resin; the high-frequency needle device 8 is arranged at the rear end of the cooling roller assembly 7 in the conveying direction. The high-frequency needle device 8 is arranged to be composed of an upper needle plate and a lower needle eye platform. The working frequency of the high-frequency needle device is preferably 10-30 needles / minute.

[0038] The upper needle plate and the lower eyelet table are relatively arranged up and down, and the upper needle plate and the lower eyelet table can move up and down, thereby puncturing and exhausting the prepreg.

[0039] The upper needle plate of the high-frequency needle device is arranged with a single row of needles with a spacing of 2-5mm along the width direction, where the needle diameter is controlled within the range of 0.2-0.5mm. The lower needle eye platform is provided with a single row of needle hole plates with the same specifications as the needles to achieve continuous puncture and exhaust of the prepreg during the transmission process.

[0040] This device can be installed after the carbon fiber unidirectional arrangement processing device, the multidirectional fabric processing device and various widened carbon fiber unidirectional (multidirectional) processing devices to form a continuous processing system with them, so as to realize the rapid melt infiltration composite molding of thermoplastic resin film and carbon fiber flat fabric structure, which can effectively improve the melt infiltration effect of resin inside the fiber and improve the stable production level and product quality of prepreg.

[0041] The melt infiltration composite device of the present invention is described below with reference to specific embodiments.

[0042] Example 1:

[0043] In this embodiment, preheating and positioning zone 1 utilizes four sets of chrome-plated alloy steel rollers with controllable gaps, each 100 mm in diameter and 1200 mm in length, to preheat the polypropylene film resin through heat transfer oil circulation. The overall preheating pressure range is controlled between 0.5 and 5 MPa. The resin film is applied to the carbon fiber fabric surface for positioning. The roller assemblies are designed with a gradient preheating operating temperature: the first-stage roller assembly has a temperature of 200°C and a roller pressure of 5 MPa; the second-stage roller assembly has a temperature of 210°C and a roller pressure of 4 MPa; the third-stage roller assembly has a temperature of 215°C and a roller pressure of 3 MPa; and the fourth-stage roller assembly has a temperature of 218°C and a roller pressure of 2 MPa. The first-stage roller assembly has a cylindrical upper roller and a spindle-shaped lower roller. The second-stage roller assembly utilizes a spindle-shaped upper roller and a cylindrical lower roller. The third and fourth-stage roller assemblies both utilize a combination of upper and lower cylindrical rollers. The rotation speed and direction of the roller assembly are synchronized with the overall transmission of the prepreg production.

[0044] The heating and infiltration zone utilizes a 400mm-long, wavy, axially profiled cavity design to achieve rapid infiltration and lamination of the resin film. The cavity is 1400mm wide, and four sets of cylindrical rollers are positioned at specific locations on the inner surface of the cavity. These rollers rotate in a direction opposite to the overall prepreg transmission direction. The heating and infiltration zone utilizes far-infrared heating, with a temperature of 230°C and a temperature fluctuation of no more than ±0.5°C.

[0045] The post-processing molding area consists of a set of cooling roller assemblies and a high-frequency needle device (composed of an upper needle plate and a lower needle eye platform) with a working frequency of 10 needles / minute. A heating device in the range of 210°C is set on the surface of the cooling roller assembly. The upper needle plate of the high-frequency needle device is arranged with a single row of needles with a diameter of 0.2mm and a spacing of 2mm along the width. The lower needle eye platform is designed with a single row of needle holes with the same specifications as the needles. The cooling roller assembly and the high-frequency needle device are combined to realize the removal of gas between the bundles of the thermoplastic prepreg, and finally achieve dense molding between the prepreg layers.

[0046] Example 2:

[0047] In this embodiment, the preheating and positioning zone utilizes four sets of 200mm diameter and 1000mm length chrome-plated alloy steel roller assemblies with controllable gaps to preheat the polyethylene film resin through heat transfer oil circulation. The overall preheating pressure range is controlled within 0.5-5MPa. The resin film is applied to the carbon fiber fabric surface for positioning. The roller assemblies are designed with a gradient preheating operating temperature: the first-stage roller assembly temperature is 110°C and the roller pressure is 4MPa; the second-stage roller assembly temperature is 120°C and the roller pressure is 3MPa; the third-stage roller assembly temperature is 125°C and the roller pressure is 3MPa; and the fourth-stage roller assembly temperature is 128°C and the roller pressure is 2MPa. The first-stage roller assembly has a cylindrical upper roller and a spindle-shaped lower roller. The second-stage roller assembly uses a spindle-shaped upper roller and a cylindrical lower roller. The third and fourth-stage roller assemblies both use a combination of upper and lower cylindrical rollers. The rotation speed and direction of the roller assembly are synchronized with the overall transmission of the prepreg production.

[0048] The heating and infiltration zone utilizes a 1000mm-long, wavy, axially profiled cavity design to achieve rapid infiltration and lamination of the resin film. The cavity is 1100mm wide, and three sets of cylindrical rollers are positioned at specific locations on the inner surface of the cavity. These rollers rotate in a direction opposite to the overall prepreg transmission direction. The heating and infiltration zone utilizes far-infrared heating, with a heating temperature of 14°C and a temperature fluctuation of no more than ±0.5°C.

[0049] The post-processing molding area consists of a set of cooling roller assemblies and a high-frequency needle device (composed of an upper needle plate and a lower needle eye platform) with a working frequency of 15 needles / minute. A heating device in the range of 120°C is set on the surface of the cooling roller assembly. The upper needle plate of the high-frequency needle device is arranged with a single row of needles with a diameter of 0.3mm and a spacing of 3mm along the width. The lower needle eye platform is designed with a single row of needle holes with the same specifications as the needles. The cooling roller assembly and the high-frequency needle device are combined to realize the removal of gas between the bundles of the thermoplastic prepreg, and finally achieve dense molding between the prepreg layers.

[0050] Example 3:

[0051] In this embodiment, the preheating and positioning zone utilizes three sets of chrome-plated alloy steel rollers with a controlled gap, each 500mm in diameter and 1400mm in length, to preheat the polyamide film resin electrically. The preheating pressure is controlled within a range of 0.5-5 MPa, applying the resin film to the carbon fiber fabric surface for positioning. The rollers are designed with a gradient preheating temperature: the first-stage roller assembly has a temperature of 240°C and a pressure of 5 MPa; the second-stage roller assembly has a temperature of 250°C and a pressure of 4 MPa; and the third-stage roller assembly has a temperature of 255°C and a pressure of 3 MPa. The first-stage roller assembly features a cylindrical upper roller and a spindle-shaped lower roller. The second-stage roller assembly utilizes a spindle-shaped upper roller and a cylindrical lower roller. The third-stage roller assembly utilizes a combination of upper and lower cylindrical rollers. The roller assembly's rotational speed and direction are synchronized with the overall prepreg production drive.

[0052] The heating and infiltration zone utilizes a 1500mm-long, wavy, axially profiled cavity design to achieve rapid infiltration and lamination of the resin film. The cavity is 1600mm wide, and four sets of cylindrical rollers are positioned at specific locations on the inner surface of the cavity. These rollers rotate in the opposite direction of the overall prepreg transmission direction. The heating and infiltration zone utilizes far-infrared heating, with a temperature of 265°C and a temperature fluctuation of no more than ±0.5°C.

[0053] The post-processing molding area consists of a set of cooling roller assemblies and a high-frequency needle device (composed of an upper needle plate and a lower needle eye platform) with a working frequency of 20 needles / minute. A heating device in the range of 250°C is set on the surface of the cooling roller assembly. The upper needle plate of the high-frequency needle device is arranged with a single row of needles with a diameter of 0.35mm and a spacing of 4mm along the width. The lower needle eye platform is designed with a single row of needle holes with the same specifications as the needles. The cooling roller assembly and the high-frequency needle device are combined to realize the removal of gas between the bundles of the thermoplastic prepreg, and finally achieve dense molding between the prepreg layers.

[0054] Example 4:

[0055] In this embodiment, the preheating positioning area uses 5 groups of chrome-plated alloy steel roller assemblies with a diameter of 450 mm and a length of 1500 mm with controllable gaps to preheat the polypropylene film resin by electric heating. The overall pressure range of the preheating process is controlled at 0.5-5 MPa. The resin film is applied to the surface of the carbon fiber fabric to achieve positioning. The preheating working temperature of the roller assembly is gradiently configured. The temperature of the first-level roller assembly is 200°C and the roller pressure is 5 MPa; the temperature of the second-level roller assembly is 210°C and the roller pressure is 4 MPa; the temperature of the third-level roller assembly is 210°C and the roller pressure is 3 MPa; the temperature of the fourth-level roller assembly is 215°C and the roller pressure is 2 MPa; the temperature of the fifth-level roller assembly is 220°C and the roller pressure is 2 MPa. The first-stage roller assembly features a cylindrical upper roller and a spindle-shaped lower roller. The second-stage roller assembly utilizes a spindle-shaped upper roller and a cylindrical lower roller. The third through fifth stages all utilize a combination of upper and lower cylindrical rollers. The roller assembly's rotational speed and direction are synchronized with the overall prepreg production drive.

[0056] The heating and infiltration zone utilizes a 1500mm-long, wavy, axially profiled cavity design to achieve rapid infiltration and lamination of the resin film. The cavity is 1900mm wide, and four sets of cylindrical rollers are positioned at specific locations on the inner surface of the cavity. These rollers rotate in a direction opposite to the overall prepreg transmission direction. The heating and infiltration zone utilizes far-infrared heating, with a temperature of 224°C and a temperature fluctuation of no more than ±0.5°C.

[0057] The post-processing molding area consists of a set of cooling roller assemblies and a high-frequency needle device (composed of an upper needle plate and a lower needle eye platform) with a working frequency of 30 needles / minute. A heating device in the range of 210°C is set on the surface of the cooling roller assembly. The upper needle plate of the high-frequency needle device is arranged with a single row of needles with a diameter of 0.5mm and a spacing of 5mm along the width. The lower needle eye platform is designed with a single row of needle holes with the same specifications as the needles. The cooling roller assembly and the high-frequency needle device are combined to realize the removal of gas between the bundles of the thermoplastic prepreg, and finally achieve dense molding between the prepreg layers.

[0058] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A carbon fiber thermoplastic prepreg infiltration composite device, characterized in that: It includes a preheating and positioning area, a heating and melting infiltration area, and a post-processing and forming area arranged in sequence; the preheating and positioning area is provided with multiple sets of roller assemblies to preheat the prepreg and apply it to the surface of the carbon fiber fabric and achieve positioning; a special-shaped plane cavity is provided inside the heating and melting infiltration area; the special-shaped plane cavity has a wavy axial section for the carbon fiber fabric with film resin applied to pass through; cylindrical rollers are provided at the troughs of the wavy shape on both sides of the special-shaped plane cavity, and the rotation direction of the cylindrical rollers is opposite to the transmission direction of the prepreg, so as to achieve rapid melting and infiltration compounding of the prepreg; the post-processing and forming area includes a cooling roller assembly and a needle device arranged in sequence to achieve gas removal between the bundles of the prepreg and achieve dense molding between the prepreg layers; The preheating working temperature of the roller surface of the roller assembly is within the range of 5-20°C lower than the hot melt flow temperature of the prepreg; the surface working temperature of each group of roller assemblies is set in a gradient; The pressurization pressure of the roller assembly is within the range of 0.5-5 MPa; the pressure of each group of roller assemblies is set in a gradient; The upper roller of the first-stage roller assembly is cylindrical and the lower roller is a spindle-shaped roller; the upper roller of the second-stage roller assembly is spindle-shaped and the lower roller is cylindrical; the upper and lower rollers of the remaining roller assemblies are all cylindrical.

2. The carbon fiber thermoplastic prepreg infiltration composite device according to claim 1, characterized in that: The gap between the roller assemblies is adjustable. Each set of roller assemblies includes two rollers arranged opposite to each other, and heating elements are arranged inside the rollers. The rotation direction of the roller assemblies is consistent with the transmission direction of the prepreg.

3. The carbon fiber thermoplastic prepreg infiltration composite device according to claim 1, characterized in that: Heaters are arranged on both sides of the special-shaped plane cavity, and the heating temperature is within the range of 2-10° C. higher than the hot melt flow temperature of the prepreg.

4. The carbon fiber thermoplastic prepreg infiltration composite device according to claim 1, characterized in that: The cooling roller assembly includes two rollers facing each other up and down, a heating device is arranged inside the rollers, and the surface temperature of the rollers is lower than the hot melt flow temperature of the prepreg.

5. The carbon fiber thermoplastic prepreg infiltration composite device according to claim 1, characterized in that: The needle device includes an upper needle plate and a lower eyelet platform which are arranged relatively up and down, and the upper needle plate and the lower eyelet platform can move back and forth relatively up and down. The upper needle plate is provided with a single row of needles, and the lower eyelet platform is provided with a single row of needle hole plates.

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