Light-curing 3D printing head and printing method for continuous carbon fiber composite materials

Abstract

The present application belongs to the technical field of forming materials in a plastic state. A photocuring 3D printing head and a printing method for continuous carbon fiber composite materials are proposed. The printing head includes: a bracket; a material tray bracket and a carbon fiber material tray, the material tray bracket is mounted to the bracket, and the carbon fiber material tray is mounted on the material tray bracket; a resin extrusion device, which includes a resin storage tank, a resin push rod and a motor, the resin storage tank is mounted to the bracket, and the motor is used to drive the resin push rod to move along the axial direction of the resin push rod, thereby squeezing out the resin in the resin storage tank; a mixing nozzle, which is connected to the resin storage tank and includes a fiber feed hole, a resin feed hole, a mixing chamber and a nozzle, the fiber feed hole and the resin feed hole are connected to one end of the mixing chamber, and the nozzle is connected to the other end of the mixing chamber; and an ultraviolet emitting device, which is mounted on the mixing nozzle and includes one or more ultraviolet emitters for irradiating and curing the mixture extruded by the nozzle.

Description

Technical Field

[0001] The present application belongs to the technical field of forming plastic state materials, and in particular relates to a light-curing 3D printing head and a printing method for continuous carbon fiber composite materials. Background Art

[0002] Carbon fiber composites, due to their excellent strength-to-weight ratio and corrosion resistance, have become a preferred material in high-end manufacturing. However, traditional carbon fiber composite manufacturing methods rely on complex and time-consuming manual layup and high-temperature curing processes, resulting in high costs and low production efficiency. To overcome these shortcomings, composite manufacturing methods based on 3D printing technology have emerged in recent years.

[0003] While current 3D printing technology has enabled the manufacture of resin-based composites, the processing of continuous carbon fiber composites remains a significant challenge. Existing 3D printing technology primarily utilizes short carbon fibers, which improves printing flexibility. However, due to the limited length of short fibers, their reinforcement and toughening effects are inferior to those of continuous carbon fibers, resulting in insufficient overall strength in printed parts. Consequently, the superior properties of carbon fibers cannot be fully utilized for high-performance structural applications. Summary of the Invention

[0004] To overcome or mitigate the shortcomings of the aforementioned prior art, one object of this application is to provide a light-curing 3D printing head for continuous carbon fiber composite materials. This print head achieves efficient winding and rapid curing of the continuous carbon fiber by co-extruding continuous carbon fiber and UV-curable resin. Another object of this application is to provide a method for printing continuous carbon fiber composite materials.

[0005] In order to achieve the above-mentioned purpose of the invention, the present application may adopt the following technical solutions.

[0006] The embodiment of the present application provides a light-curing 3D printing head for continuous carbon fiber composite materials, which includes: a bracket; a carbon fiber feeding device, which includes a material tray bracket and a carbon fiber material tray; the material tray bracket is installed to the bracket, the carbon fiber material tray is installed to the material tray bracket, and the carbon fiber material tray is wound with carbon fiber tow; a resin extrusion device, which includes a resin storage tank, a resin push rod and a motor; the resin storage tank is installed to the bracket; one end of the resin push rod extends into the resin storage tank, and the other end is connected to the motor, and the motor is used to drive the resin push rod to move along the axial direction of the resin push rod, thereby squeezing out the resin in the resin storage tank; a mixing nozzle, which is connected to the A resin storage tank includes a fiber feed hole, a resin feed hole, a mixing chamber, and a nozzle. The fiber feed hole and the resin feed hole are connected to one end of the mixing chamber, and the nozzle is connected to the other end of the mixing chamber. The resin feed hole is connected to the resin storage tank so that the resin can enter the resin feed hole. The carbon fiber tow passes through the fiber feed hole. The resin and the carbon fiber tow are mixed in the mixing chamber to form a mixture, which is then extruded through the nozzle. A UV emitting device is mounted on the mixing nozzle and includes one or more UV emitters for irradiating and curing the mixture extruded from the nozzle. The UV emitting device is equipped with an adjustment mechanism for adjusting the irradiation angle of the UV emitters. The adjustment mechanism includes a worm, multiple worm gears, and an angle adjustment knob. The angle adjustment knob is mounted on the end of the worm. The multiple worm gears mesh with the worm and are evenly distributed around the circumference of the worm. Each worm gear is connected to a UV emitter. By turning the angle adjustment knob, the worm drives the multiple worm gears to rotate, thereby synchronously adjusting the angles of the multiple UV emitters. The ultraviolet emitting device also includes an upper shell and a lower shell, which are fixedly connected to each other and are used to fix the adjustment mechanism; wherein the upper shell is located on the side of the worm gear close to the angle adjustment knob, and the lower shell is located on the side of the worm gear away from the angle adjustment knob, and the lower shell is connected to the resin extrusion device and the mixing nozzle.

[0007] In at least one embodiment, the mixing nozzle further comprises a nozzle support member that supports the nozzle; the nozzle support member is mounted at the other end of the mixing chamber, the fiber feed hole, the mixing chamber, the nozzle support member and the nozzle are coaxially arranged in sequence, and the central axis of the resin feed hole is arranged at 90 degrees to the central axis of the fiber feed hole.

[0008] In at least one embodiment, a cavity is provided inside the mixing chamber, and the cross-section of the middle portion of the cavity is larger than the cross-sections of the two end portions thereof, which can prevent the resin in the mixing chamber from flowing back from the fiber feeding hole.

[0009] In at least one embodiment, the nozzle and the nozzle support are made of metal material, which can prevent the resin inside the nozzle from being solidified after being irradiated by the ultraviolet emitting device.

[0010] In at least one embodiment, hollow channels are provided inside the worm and the angle adjustment knob, so that the carbon fiber tow can pass through the ultraviolet emitting device and enter the fiber feeding hole of the mixing nozzle.

[0011] In at least one embodiment, the ultraviolet emitting device is further provided with a support assembly for fixing the ultraviolet emitter; the support assembly includes a worm gear emitter bracket and a mounting shaft; wherein the worm gear is mounted to the mounting shaft, the worm gear emitter bracket is connected to the worm gear, the ultraviolet emitter is mounted to the worm gear emitter bracket, and the mounting shaft is rotatably connected to the upper shell and the lower shell, so that the ultraviolet emitter can rotate relative to the upper shell and the lower shell around the axis of the mounting shaft.

[0012] In at least one embodiment, the plurality of ultraviolet emitters are evenly distributed in the circumferential direction of the worm; wherein each of the ultraviolet emitters is respectively mounted on one of the worm gear emitter brackets of the support assembly.

[0013] In at least one embodiment, the photocuring 3D print head further includes a fixing member, which includes a fixed base, and the fixed base can be installed at one end of the bracket away from the material tray bracket and fixedly connected to the end of the robotic arm; or, it further includes a fixing member, which includes a fixed base and an adapter for adjusting the printing direction of the print head; wherein the adapter is provided with a first connection end, a second connection end and a third connection end, the first connection end can be connected to the resin storage tank, the second connection end can be connected to the resin feed hole of the mixing nozzle, so that the adapter is connected to the mixing nozzle and the resin storage tank respectively, and the resin can enter the resin feed hole through the adapter; the third connection end can be connected to the fixed base and fixedly connected to the end of the robotic arm, the first connection end, the second connection end and the third connection end constitute three ends of a T-shaped structure, and the second connection end and the third connection end are located at both ends of a straight passage.

[0014] An embodiment of the present application also provides a method for printing a continuous carbon fiber composite material, which uses a light-curing 3D printing head for a continuous carbon fiber composite material of the present application, and includes: an extrusion step: adjusting the rotation speed of the motor so that the resin extrusion device extrudes the resin in a quantitative manner; fully mixing the resin and the carbon fiber tow in the mixing chamber, and then extruding the mixture through the nozzle; and a curing step: the ultraviolet emitter irradiates the mixture extruded by the nozzle, thereby curing and forming the mixture.

[0015] By adopting the above-mentioned technical solution, this application provides a light-curing 3D printing head and printing method for continuous carbon fiber composite materials. By co-extruding continuous carbon fiber and UV-curable resin, the continuous carbon fiber is efficiently wound and rapidly solidified during the printing process. This not only improves processing efficiency but also overcomes the problems of carbon fiber separation and uneven curing in traditional processes, resulting in continuous carbon fiber composite 3D printed structural parts with excellent mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a photocuring 3D printing head for a continuous carbon fiber composite material according to an embodiment of the present application is shown;

[0017] Figure 2 A schematic structural diagram of a resin extrusion device according to an embodiment of the present application is shown;

[0018] Figure 3 A schematic structural diagram of a mixing nozzle according to an embodiment of the present application is shown;

[0019] Figure 4 A schematic structural diagram of an ultraviolet curing device according to an embodiment of the present application is shown;

[0020] Figure 5 A schematic structural diagram of an upper housing of an ultraviolet curing device according to an embodiment of the present application is shown;

[0021] Figure 6 Shown Figure 4 A schematic diagram of the structure of the regulating device of the medium ultraviolet curing device;

[0022] Figure 7 A schematic structural diagram of a fixing member according to an embodiment of the present application is shown;

[0023] Figure 8 A schematic side view of the structure of a print head in a use mode of a fixing member of the present application is shown;

[0024] Figure 9 A schematic side view of the print head in another use mode of the fixing member of the present application is shown;

[0025] Figure 10 A schematic diagram of a motor speed adjustment process for a photocuring 3D printing head of a continuous carbon fiber composite material according to an embodiment of the present application is shown.

[0026] Description of Reference Numerals

[0027] 10 brackets;

[0028] 20 carbon fiber feeding device;

[0029] 21 tray support; 22 carbon fiber tray; 23 carbon fiber tow;

[0030] 30 resin extrusion device;

[0031] 31 Resin storage tank; 32 Resin push rod; 33 Motor; 34 Lead screw; 35 Guide rail; 36 Support block;

[0032] 40 mixing nozzle;

[0033] 41 Fiber feed hole; 42 Resin feed hole; 43 Mixing chamber; 44 Nozzle; 45 Nozzle holder;

[0034] 50 ultraviolet emitting device;

[0035] 51 UV emitter; 52 worm; 53 worm gear; 54 angle adjustment knob; 55 upper housing; 56 lower housing; 57 emitter bracket; 58 mounting shaft;

[0036] 60 fixings;

[0037] 61 adapter;

[0038] 611 First connection end; 612 Second connection end; 613 Third connection end. Specific embodiments

[0039] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0040] In this application, unless otherwise specified, "axial direction" refers to the axial direction of the resin push rod of this application, and "circumferential direction" refers to the circumferential direction of the worm of this application.

[0041] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1As shown, an embodiment of the present application provides a light-curing 3D printing head for continuous carbon fiber composite materials, which may include a bracket 10, a carbon fiber feeding device 20, a resin extrusion device 30, a mixing nozzle 40 and an ultraviolet emitting device 50.

[0043] like Figure 1 As shown, the carbon fiber feeding device 20 may include a tray bracket 21 and a carbon fiber tray 22. The tray bracket 21 is installed to the bracket 10, and the carbon fiber tray 22 is installed on the tray bracket 21. The carbon fiber tray 22 is wound with a carbon fiber tow 23, and the carbon fiber tow 23 may be a single strand or multiple strands of continuous carbon fiber tow.

[0044] Furthermore, the tray support 21 is installed between the support 10 and the carbon fiber feeding device 20 .

[0045] like Figure 1 and 2 As shown, the resin extrusion device 30 is used to supply UV-curable resin. It includes a resin storage tank 31, a resin push rod 32, and a motor 33. The resin storage tank 31 is mounted to the bracket 10. One end of the resin push rod 32 extends into the resin storage tank 31, and the other end is connected to the motor 33. The motor 33 is used to drive the resin push rod 32 along the axial direction A of the resin push rod 32, thereby squeezing the resin out of the resin storage tank 31.

[0046] Furthermore, in this embodiment, the motor 33 may be a stepping motor.

[0047] like Figure 2 As shown, in this embodiment, the resin extrusion device 30 may further include a screw 34. One end of the screw 34 is threadedly connected to the resin push rod 32, and the other end is connected to the motor 33. In this way, the motor 33 can drive the screw 34 to rotate, and the screw 34 in turn drives the resin push rod 32 to move in the axial direction A.

[0048] Furthermore, if Figure 2 As shown, the resin extrusion device 30 may also be provided with a guide device so that the resin push rod 32 moves only along the axial direction A of the resin push rod 32 without rotating. In addition, by adjusting the motor speed, the resin extrusion device 30 can accurately extrude the resin. Specifically, the guide device may include a guide rail 35 and a support block 36.

[0049] In this embodiment, one end of the guide rail 35 is connected to the mounting hole of the resin push rod 32, and the other end is connected to the support block 36. The support block 36 is mounted on the end of the bracket 10 near the motor 33 and serves to support the guide rail 35. The guide rail 35 slides in the mounting hole of the resin push rod 32, preventing the resin push rod 32 from rotating during movement.

[0050] Furthermore, a plurality of guide rails 35 may be provided. In this embodiment, four guide rails 35 are provided.

[0051] like Figure 3 As shown, the mixing nozzle 40 is a component for achieving co-extrusion of carbon fiber and resin. The mixing nozzle 40 is connected to the resin storage tank 31 and includes a fiber feed hole 41, a resin feed hole 42, a mixing chamber 43, and a nozzle 44. The fiber feed hole 41 and the resin feed hole 42 are connected to one end of the mixing chamber 43, and the nozzle 44 is connected to the other end of the mixing chamber 43. The resin feed hole 42 is connected to the resin storage tank 31, allowing resin to enter the resin feed hole 42. The carbon fiber tow 23 passes through the fiber feed hole 41. The resin and the carbon fiber tow 23 are mixed in the mixing chamber 43 to form a mixture, which is then extruded through the nozzle 44.

[0052] Furthermore, the length of nozzle 44 should not be too short and can be adjusted based on actual printing conditions. This prevents ultraviolet radiation from reaching the connection area between the nozzle and the mixing chamber, thereby preventing the resin stored in the connection area from solidifying. Furthermore, during 3D printing, the robotic arm can reach deeper into areas, avoiding unexpected collisions caused by the print head being fixed to the robotic arm and unreachable singularities during path calculation.

[0053] For example, in this embodiment, the nozzle 44 can be a standard part with a length of 75 mm. The diameter (inner diameter) can be selected according to the thickness of the carbon fiber tow, and can be 0.8 mm, 1.2 mm, 1.6 mm or 2 mm.

[0054] Furthermore, if Figure 3 As shown, mixing nozzle 40 may further include a nozzle support 45 that supports nozzle 44. Since nozzle 44 is an elongated cylindrical shape, nozzle support 45 prevents nozzle 44 from bending during printing. Nozzle support 45 is mounted on the other end of mixing chamber 43. Specifically, fiber feed hole 41, mixing chamber 43, and nozzle 44 are coaxially arranged in sequence, with the end of nozzle support 45 away from mixing chamber 43 supporting the end of nozzle 44 away from mixing chamber 43. The central axis of resin feed hole 42 is arranged at a 90-degree angle to the central axis of fiber feed hole 41.

[0055] Furthermore, in this embodiment, a channel is provided within the mixing chamber 43. To prevent the resin within the mixing chamber 43 from flowing back through the fiber feed hole 41, the cross-section of the channel in the middle of the mixing chamber 43 is larger than that of the ends. This allows the resin within the mixing chamber 43 to be fully mixed with the carbon fiber tow 23, while ensuring a smooth coextrusion process.

[0056] Furthermore, in order to prevent the resin inside the nozzle 44 from being solidified after being irradiated by the ultraviolet emitting device 50, the nozzle 44 and the nozzle support 45 use metal materials with strong ultraviolet resistance, thereby effectively blocking ultraviolet light and ensuring the continuity and reliability of the printing process.

[0057] Preferably, in this embodiment, the nozzle 44 and the nozzle support 45 are made of 304 stainless steel.

[0058] like Figure 1 As shown, the ultraviolet emitting device 50 is a component for rapidly curing the resin, which is installed on the mixing nozzle 40 and includes one or more ultraviolet emitters 51 for irradiating and curing the mixture extruded by the nozzle 44, so that the continuous carbon fiber composite material can be formed in real time during the printing process.

[0059] Furthermore, in this embodiment, the ultraviolet emitter 51 may be an ultraviolet lamp in the 405 nm band.

[0060] like Figure 4 and Figure 6 As shown, the UV emitting device 50 also has an adjustment mechanism for adjusting the irradiation angle of the UV emitters 51. The adjustment mechanism includes a worm 52, multiple worm gears 53, and an angle adjustment knob 54. The angle adjustment knob 54 is mounted on the end of the worm 52. Multiple worm gears 53 mesh with the worm 52 and are evenly distributed around the circumference of the worm 52. Each worm gear 53 is connected to a UV emitter 51. By turning the angle adjustment knob 54, the worm 52 drives the multiple worm gears 53 to rotate, thereby synchronously adjusting the angles of multiple UV emitters 51.

[0061] Furthermore, if Figure 1 As shown, hollow channels are provided inside the worm 52 and the angle adjustment knob 54 , so that the carbon fiber tow 23 can pass through the ultraviolet emitting device 50 and enter the fiber feeding hole 41 of the mixing nozzle 40 .

[0062] like Figure 5 As shown, the UV emitting device 50 also includes an upper housing 55 and a lower housing 56, which are fixedly connected by a connector to facilitate the fixing of the adjustment mechanism. The upper housing 55 is located on the side of the worm 52 close to the angle adjustment knob 54, while the lower housing 56 is located on the side of the worm 52 away from the angle adjustment knob 54. The lower housing 56 is connected to the resin extruder 30 and the mixing nozzle 40.

[0063] like Figure 4As shown, the UV emitter device 50 also includes a support assembly for securing the UV emitter. Specifically, the support assembly includes a worm gear emitter bracket 57 and a mounting shaft 58. The worm gear 53 is mounted to the mounting shaft 58, which is connected to the worm gear 53. The UV emitter 51 is mounted to the worm gear emitter bracket 57. The mounting shaft 58 is rotatably connected to the upper and lower housings 55, 56, allowing the UV emitter 51 to rotate relative to the upper and lower housings 55, 56 about the axis of the mounting shaft 58.

[0064] The worm 52 is rotatably connected to the upper housing 55 and the lower housing 56. The upper housing 55 and the lower housing 56 define the position of the worm 52 along its axial direction, but the upper housing 55 and the lower housing 56 allow the worm 52 to rotate around its axis.

[0065] Furthermore, a worm wheel with a suitable central angle can be selected according to the adjustment angle of the ultraviolet emitter 51. Preferably, in this embodiment, the worm wheel 53 does not need to be circular, but can be roughly sector-shaped, and the central angle corresponding to its outer teeth can be less than 180 degrees.

[0066] Furthermore, the worm gear 53 and the support assembly can be integrally formed, for example, by machining, stamping, or the like.

[0067] In this embodiment, if Figure 4 and 5 As shown, a plurality of ultraviolet emitters 51 are evenly distributed in the circumferential direction of the worm 52 ; wherein each ultraviolet emitter 51 is respectively mounted on a worm gear emitter bracket 57 of the support assembly.

[0068] Figure 6 Figure 5 schematically illustrates the angle adjustment direction of the UV emitter 51, with the dotted arrow indicating the direction of UV radiation from the UV emitter 51. Adjusting the emitter's angle allows for adjustment of its focal position, allowing for rapid and uniform curing of the resin after extrusion, thereby preventing sticking that could affect subsequent printing processes.

[0069] Figure 7 The schematic diagram of the fixing member of the present application is shown, which can connect the print head to the end of the robot arm, so that the print head is fixed to the robot arm, thereby achieving precise movement along a complex path. Specifically, the fixing member can include a fixing base 60 and an adapter 61.

[0070] like Figure 8 As shown, the fixed base 60 can be installed at one end of the bracket 10 away from the tray bracket 21, and it can be fixedly connected to the end of the robotic arm.

[0071] like Figure 9As shown, the adapter 61 can adjust the printing direction of the print head, and the fixed base 60 can be fixedly connected to the end of the robot arm. Specifically, the adapter 61 has a first connection end 611, a second connection end 612, and a third connection end 613. The first connection end 611, the second connection end 612, and the third connection end 613 form the three ends of a T-shaped structure, with the second connection end 612 and the third connection end 613 located at the two ends of a straight path.

[0072] like Figure 9 As shown, the first connection end 611 can be connected to the resin storage tank 21, and the second connection end 612 can be connected to the resin feed hole 42 of the mixing nozzle 40, so that the adapter 61 is connected to the mixing nozzle 40 and the resin storage tank 31 respectively, and resin can enter the resin feed hole 42 through the adapter 61. The third connection end 613 can be connected to the fixed base 60 and fixedly connected to the end of the robot arm. In this way, the fixed position and printing direction can be flexibly adjusted through the adapter 61 to meet actual printing needs.

[0073] Furthermore, the fixed base 60 can be fixedly connected to the flange at the end of the robotic arm. Specifically, the robotic arm can be a 6-axis robotic arm. In one example, the combination with the 6-axis robotic arm enables the print head to move precisely on complex curved surfaces, achieving high-performance printing of special-shaped parts and further improving printing accuracy and automation.

[0074] Figure 10 This is a schematic diagram of the print head motor speed adjustment process for this application. Specifically, the target motor speed can be calculated based on the winding speed of the robotic arm on which the print head is mounted. The speed of the print head motor 33 is adjusted to evenly extrude the resin, thereby ensuring that the resin is evenly coated on the carbon fiber tow until printing is completed. In one example, a robotic arm can pull the carbon fiber to be wound onto the printed product, while the print head extrudes the carbon fiber and resin to achieve printing.

[0075] The present application also provides a printing method using a photocuring 3D printing head for continuous carbon fiber composite materials, which may include the following steps.

[0076] The speed of motor 33 is adjusted so that resin extruder 30 extrudes a fixed amount of resin. The resin and carbon fiber tow 23 are thoroughly mixed in mixing chamber 43 and then extruded through nozzle 44. Ultraviolet light emitter 51 irradiates the mixture extruded from nozzle 44, thereby solidifying the mixture.

[0077] Furthermore, the method further includes a calibration step for the ultraviolet emitter 51 , and according to the specific printed workpiece, the ultraviolet emitter 51 is precisely adjusted in angle by adjusting the worm and the worm gear emitter bracket.

[0078] Furthermore, a preparation step may be included, that is, winding the carbon fiber tow 23 on the fiber material tray 12, and stably mounting the print head on the end of the robot arm through a fixing member.

[0079] By adopting the above solution, the photocuring 3D printing head for continuous carbon fiber composites provided by this application ensures efficient winding and rapid curing during the printing process by co-extruding continuous carbon fiber and UV-curable resin. Combined with a 6-axis robotic arm, the print head can move precisely along complex paths to achieve high-performance printing of special-shaped parts. During the printing process, the high precision and flexibility of the robotic arm enable the carbon fiber to be precisely wound and laid to the specified position, making it particularly suitable for the manufacture of high-strength and lightweight composite structural parts.

[0080] This automated, high-precision printing method not only improves manufacturing efficiency and reduces reliance on manual operations, but also significantly reduces the production cost of carbon fiber composite materials. It has broad industrial application prospects and economic benefits.

Claims

1. A light-curing 3D printing head for continuous carbon fiber composite materials, characterized in that: include: Bracket (10); A carbon fiber feeding device (20) comprising a tray support (21) and a carbon fiber tray (22); the tray support (21) is mounted on the support (10), the carbon fiber tray (22) is mounted on the tray support (21), and a carbon fiber tow (23) is wound around the carbon fiber tray (22); A resin extrusion device (30) comprising a resin storage tank (31), a resin push rod (32) and a motor (33); the resin storage tank (31) is mounted on the bracket (10); one end of the resin push rod (32) extends into the resin storage tank (31), and the other end is connected to the motor (33), and the motor (33) is used to drive the resin push rod (32) to move along the axial direction (A) of the resin push rod (32), thereby extruding the resin in the resin storage tank (31); a mixing nozzle (40) connected to the resin storage tank (31) and comprising a fiber feed hole (41), a resin feed hole (42), a mixing chamber (43) and a nozzle (44), wherein the fiber feed hole (41) and the resin feed hole (42) are connected to one end of the mixing chamber (43), and the nozzle (44) is connected to the other end of the mixing chamber (43); wherein the resin feed hole (42) is communicated with the resin storage tank (31) so that the resin can enter the resin feed hole (42), the carbon fiber tow (23) passes through the fiber feed hole (41), the resin and the carbon fiber tow (23) are mixed in the mixing chamber (43) to form a mixture, and the mixture is extruded through the nozzle (44); and an ultraviolet emitting device (50), which is installed on the mixing nozzle (40) and includes one or more ultraviolet emitters (51) for irradiating and curing the mixture extruded from the nozzle (44). The ultraviolet emitting device (50) is provided with an adjustment mechanism for adjusting the irradiation angle of the ultraviolet emitter (51); The adjustment mechanism comprises a worm (52), a plurality of worm wheels (53) and an angle adjustment knob (54), wherein the angle adjustment knob (54) is mounted on the end of the worm (52), the plurality of worm wheels (53) are meshed with the worm (52) and are evenly distributed in the circumferential direction of the worm (52), each of the worm wheels (53) is connected to an ultraviolet emitter (51), and by rotating the angle adjustment knob (54), the worm (52) drives the plurality of worm wheels (53) to rotate, thereby synchronously adjusting the angles of the plurality of ultraviolet emitters (51). The ultraviolet emitting device (50) further comprises an upper shell (55) and a lower shell (56), wherein the upper shell (55) and the lower shell (56) are fixedly connected and used to fix the adjustment mechanism; wherein the upper shell (55) is located on a side of the worm (52) close to the angle adjustment knob (54), and the lower shell (56) is located on a side of the worm (52) away from the angle adjustment knob (54), and the lower shell (56) is connected to the resin extrusion device (30) and the mixing nozzle (40). Hollow channels are provided inside the worm (52) and the angle adjustment knob (54), so that the carbon fiber tow (23) can pass through the ultraviolet emitting device (50) and enter the fiber feeding hole (41) of the mixing nozzle (40).

2. The light-curing 3D printing head of continuous carbon fiber composite material according to claim 1, characterized in that: The mixing nozzle (40) further includes a nozzle support (45) which supports the nozzle (44); the nozzle support (45) is mounted on the other end of the mixing chamber (43); the fiber feed hole (41), the mixing chamber (43), the nozzle support (45) and the nozzle (44) are coaxially arranged in sequence; and the central axis of the resin feed hole (42) is arranged at 90 degrees to the central axis of the fiber feed hole (41).

3. The light-curing 3D printing head of the continuous carbon fiber composite material according to claim 2, characterized in that: A cavity is provided inside the mixing chamber (43), and the cross-section of the middle portion of the cavity is larger than the cross-sections of the two end portions thereof, thereby preventing the resin in the mixing chamber (43) from flowing back from the fiber feed hole (41).

4. The light-curing 3D printing head of the continuous carbon fiber composite material according to claim 2, characterized in that: The nozzle (44) and the nozzle support (45) are made of metal material, and can prevent the resin inside the nozzle (44) from being solidified after being irradiated by the ultraviolet emitting device (50).

5. The light-curing 3D printing head of continuous carbon fiber composite material according to claim 1, characterized in that: The ultraviolet emitting device (50) is further provided with a support assembly for fixing the ultraviolet emitter (51); the support assembly comprises a worm gear emitter bracket (57) and a mounting shaft (58); wherein the worm gear (53) is mounted on the mounting shaft (58), the worm gear emitter bracket (57) is connected to the worm gear (53), the ultraviolet emitter (51) is mounted on the worm gear emitter bracket (57), and the mounting shaft (58) is rotatably connected to the upper housing (55) and the lower housing (56), so that the ultraviolet emitter (51) can rotate relative to the upper housing (55) and the lower housing (56) around the axis of the mounting shaft (58).

6. The light-curing 3D printing head of continuous carbon fiber composite material according to claim 1, characterized in that: It also includes a fixing member, the fixing member includes a fixing base (60), the fixing base (60) can be installed on an end of the bracket (10) away from the tray bracket (21), and is fixedly connected to the end of the robot arm; Alternatively, a fixing member is further included, wherein the fixing member includes a fixing base (60) and an adapter (61) for adjusting the printing direction of the print head; wherein the adapter (61) is provided with a first connecting end (611), a second connecting end (612) and a third connecting end (613), wherein the first connecting end (611) can be connected to the resin storage tank (31), and the second connecting end (612) can be connected to the resin feed hole (42) of the mixing nozzle (40), so that the adapter (61) can be connected to the resin storage tank (31), the second connecting end (612) can be connected to the resin feed hole (42) of the mixing nozzle (40), and the third connecting end (613) can be connected to the resin storage tank (31), the second connecting end (612) can be connected to the resin feed hole (42) of the mixing nozzle (40), and the third connecting end (613) can be connected to the resin storage tank (31), the second connecting end (612) can be connected to the resin feed hole (42) of the mixing nozzle (40), and the third connecting end (613) can be connected to the resin storage tank (31), the second connecting end (612) can be connected to the resin storage tank (31), the second connecting end (612) can be connected to the resin feeding hole (42) of the mixing nozzle (40), and the third connecting end (613 ... The mixing nozzle (40) is connected to the resin storage tank (31), and the resin can enter the resin feed hole (42) through the adapter (61); the third connecting end (613) can be connected to the fixed base (60) and fixedly connected to the end of the robot arm, and the first connecting end (611), the second connecting end (612) and the third connecting end (613) constitute the three ends of a T-shaped structure, and the second connecting end (612) and the third connecting end (613) are located at the two ends of a straight passage.

7. A method for printing a continuous carbon fiber composite material, characterized in that: The printing method uses a light-curing 3D printing head for the continuous carbon fiber composite material according to any one of claims 1 to 6, and the printing method comprises: Extrusion step: adjusting the rotation speed of the motor (33) so that the resin extrusion device (30) quantitatively extrudes the resin; fully mixing the resin and the carbon fiber tow (23) in the mixing chamber (43), and then extruding the mixture through the nozzle (44); and Curing step: the ultraviolet emitter (51) irradiates the mixture extruded from the nozzle (44), thereby curing the mixture into a shape.

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