Photocuring 3D printing head and printing method for continuous carbon fiber composite material

Abstract

The invention belongs to the technical field of molding of plastic state materials. The invention provides a photocuring 3D printing head and a printing method for a continuous carbon fiber composite material. The printhead includes: a holder; the material tray support is installed on the support, and the carbon fiber material tray is installed on the material tray support; the resin extrusion device comprises a resin storage tank, a resin push rod and a motor, the resin storage tank is installed on the support, and the motor is used for driving the resin push rod to move in the axial direction of the resin push rod so as to extrude out resin in the resin storage tank; a mixing nozzle connected to the resin storage tank and including a fiber feeding hole, a resin feeding hole, a mixing chamber connected to one end of the mixing chamber, and a nozzle connected to the other end of the mixing chamber; and the ultraviolet emitting device is mounted on the mixing nozzle, comprises one or more ultraviolet emitters and is used for irradiating and curing the mixture extruded by the nozzle.

Description

Technical Field

[0001] This application belongs to the technical field of forming of materials in the plastic state, and particularly relates to a photo-curing 3D printing head and a printing method for continuous carbon fiber composites. Background Art

[0002] Due to its excellent strength-to-weight ratio and corrosion resistance, carbon fiber composite has become one of the preferred materials in high-end manufacturing. However, traditional manufacturing methods of carbon fiber composites rely on complex and time-consuming manual layup and high-temperature curing processes, resulting in high costs and low production efficiency. To overcome these drawbacks, in recent years, composite manufacturing methods based on 3D printing technology have emerged.

[0003] Although current 3D printing technology has been able to achieve the manufacturing of resin-based composites, there are still huge challenges in processing continuous carbon fiber composites. Existing 3D printing technologies are mainly applied to short carbon fibers, which although improves the flexibility of printing, due to the limited length of short fibers, their strengthening and toughening effects are not as good as those of continuous carbon fibers, resulting in insufficient overall strength of printed parts. Therefore, for the application of high-performance structural parts, the superior performance of carbon fiber cannot be fully utilized. Summary of the Invention

[0004] In order to overcome or mitigate the deficiencies of the above-mentioned prior art, an object of this application is to provide a photo-curing 3D printing head for continuous carbon fiber composites. This printing head realizes the efficient winding and rapid curing of continuous carbon fibers by co-extruding continuous carbon fibers and ultraviolet-curing resin. Another object of the application is to provide a printing method for continuous carbon fiber composites.

[0005] In order to achieve the above-mentioned invention objects, the following technical solutions can be adopted in this application.

[0006] Embodiments of the present application provide a light-curing 3D printing head for continuous carbon fiber composites, which includes: a bracket; a carbon fiber feeding device, which includes a tray bracket and a carbon fiber tray; the tray bracket is installed on the bracket, the carbon fiber tray is installed on the tray bracket, and a carbon fiber tow is wound on the carbon fiber tray; a resin extrusion device, which includes a resin storage tank, a resin push rod and a motor; the resin storage tank is installed on 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, so as to extrude the resin in the resin storage tank; a mixing nozzle, which is connected to the resin storage tank and includes a fiber feeding hole, a resin feeding hole, a mixing chamber and a nozzle, the fiber feeding hole and the resin feeding hole are connected to one end of the mixing chamber, and the nozzle is connected to the other end of the mixing chamber; wherein, the resin feeding hole is communicated with the resin storage tank, so that the resin can enter the resin feeding hole, the carbon fiber tow passes through the fiber feeding hole, the resin and the carbon fiber tow are mixed in the mixing chamber to form a mixture, and the mixture is extruded through the nozzle; and an ultraviolet emitting device, which is installed on the mixing nozzle and includes one or more ultraviolet emitters for irradiating and curing the mixture extruded from the nozzle.

[0007] In at least one embodiment, the mixing nozzle further includes a nozzle support for supporting the nozzle; the nozzle support is installed at the other end of the mixing chamber, the fiber feeding hole, the mixing chamber, the nozzle support and the nozzle are coaxially arranged in sequence, and the central axis of the resin feeding hole is arranged at 90 degrees to the central axis of the fiber feeding hole.

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

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

[0010] In at least one embodiment, the ultraviolet emitting device is provided with an adjusting mechanism for adjusting the irradiation angle of the ultraviolet emitter. The adjusting mechanism includes a worm, a plurality of turbines and an angle adjusting knob. The angle adjusting knob is installed at the end of the worm. The plurality of turbines are meshed with the worm and are evenly distributed in the circumferential direction of the worm. Each turbine is connected to an ultraviolet emitter. By rotating the angle adjusting knob, the worm drives the plurality of turbines to rotate, so as to synchronously adjust the angles of the plurality of ultraviolet emitters.

[0011] In at least one embodiment, hollow channels are provided inside both the worm and the angle adjustment knob, such that the carbon fiber tow can pass through the ultraviolet emission device and enter the fiber feed hole of the mixing nozzle.

[0012] In at least one embodiment, the ultraviolet emission device further includes an upper housing and a lower housing, which are fixedly connected to fix the adjustment mechanism; wherein, the upper housing is located on one side of the worm close to the angle adjustment knob, the lower housing is located on the side of the worm away from the angle adjustment knob, and the lower housing is connected to the resin extrusion device and the mixing nozzle.

[0013] In at least one embodiment, the ultraviolet emission device is further provided with a support assembly for fixing the ultraviolet emitter; the support assembly includes a turbine emitter bracket and a mounting shaft; wherein, the turbine is mounted on the mounting shaft, the turbine emitter bracket is connected to the turbine, the ultraviolet emitter is mounted on the turbine emitter bracket, and the mounting shaft is rotatably connected to the upper housing and the lower housing, such that the ultraviolet emitter can rotate relative to the upper housing and the lower housing about the axis of the mounting shaft.

[0014] In at least one embodiment, a plurality of the ultraviolet emitters are evenly distributed in the circumferential direction of the worm; wherein, each ultraviolet emitter is respectively mounted on one of the turbine emitter brackets of the support assembly.

[0015] In at least one embodiment, the photocuring 3D printing head further includes a fixing member, the fixing member includes a fixing base, and the fixing base can be mounted at one end of the bracket away from the material tray bracket and fixedly connected to the end of the robotic arm; alternatively, it further includes a fixing member, the fixing member includes a fixing base and a rotary joint for adjusting the printing direction of the printing head; wherein, the rotary joint 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, such that the rotary joint is respectively communicated with the mixing nozzle and the resin storage tank, and the resin can enter the resin feed hole through the rotary joint; the third connection end can be connected to the fixing base and fixedly connected to the end of the robotic arm, and the first connection end, the second connection end and the third connection end form 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.

[0016] An embodiment of the present application also provides a method for printing a continuous carbon fiber composite material, which uses the photocuring 3D printing head for continuous carbon fiber composite material of the present application. It includes: an extrusion step: adjusting the rotation speed of the motor so that the resin extrusion device extrudes the resin quantitatively; enabling the resin and the carbon fiber tow to be fully mixed in the mixing chamber, and then extruding the mixture through the nozzle; and a curing step: irradiating the mixture extruded from the nozzle by the ultraviolet emitter, so as to cure and form the mixture.

[0017] By adopting the above technical solution, the present application provides a photocuring 3D printing head and a printing method for continuous carbon fiber composite materials. By co-extruding continuous carbon fiber and ultraviolet curable resin, the efficient winding and rapid curing of continuous carbon fiber during the printing process are ensured. In this way, not only the processing efficiency is improved, but also the problems of carbon fiber separation and uneven curing in the traditional process are overcome, making the 3D printed structural parts of continuous carbon fiber composite materials have excellent mechanical properties. Description of the Drawings

[0018] Figure 1 Shows a schematic structural diagram of a photocuring 3D printing head for continuous carbon fiber composite materials according to an embodiment of the present application;

[0019] Figure 2 Shows a schematic structural diagram of a resin extrusion device according to an embodiment of the present application;

[0020] Figure 3 Shows a schematic structural diagram of a mixing nozzle according to an embodiment of the present application;

[0021] Figure 4 Shows a schematic structural diagram of an ultraviolet curing device according to an embodiment of the present application;

[0022] Figure 5 Shows a schematic structural diagram of the upper shell of an ultraviolet curing device according to an embodiment of the present application;

[0023] Figure 6 Shows Figure 4 a schematic structural diagram of an adjusting device of the ultraviolet curing device in;

[0024] Figure 7 Shows a schematic structural diagram of a fixing member according to an embodiment of the present application;

[0025] Figure 8 Shows a schematic side view structural diagram of a printing head in a usage mode of a fixing member according to the present application;

[0026] Figure 9 Shows a schematic side view structural diagram of a printing head in another usage mode of a fixing member according to the present application;

[0027] Figure 10 The schematic diagram of the motor speed adjustment process of the light-curing 3D printing head for continuous carbon fiber composite materials according to an embodiment of the present application is shown.

[0028] Description of the reference numerals

[0029] 10 Bracket;

[0030] 20 Carbon fiber feeding device;

[0031] 21 Tray bracket; 22 Carbon fiber tray; 23 Carbon fiber tow;

[0032] 30 Resin extrusion device;

[0033] 31 Resin storage tank; 32 Resin push rod; 33 Motor; 34 Lead screw; 35 Guide rail; 36 Support block;

[0034] 40 Mixing nozzle;

[0035] 41 Fiber feeding hole; 42 Resin feeding hole; 43 Mixing chamber; 44 Nozzle; 45 Nozzle bracket;

[0036] 50 Ultraviolet emission device;

[0037] 51 Ultraviolet emitter; 52 Worm; 53 Turbine; 54 Angle adjustment knob; 55 Upper housing; 56 Lower housing; 57 Emitter bracket; 58 Mounting shaft;

[0038] 60 Fixing part;

[0039] 61 Adapter;

[0040] 611 First connection end; 612 Second connection end; 613 Third connection end. Specific embodiments

[0041] The exemplary embodiments of the present application will be described below 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, rather than to exhaust all possible ways of the present application, nor to limit the scope of the present application.

[0042] In the present application, unless otherwise specified, "axial direction" represents the axial direction of the resin push rod of the present application, and "circumferential direction" represents the circumferential direction of the worm of the present application.

[0043] The present application will be further described in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0044] As Figure 1As shown in the figure, 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 emission device 50.

[0045] As Figure 1 shown in the figure, the carbon fiber feeding device 20 may include a tray bracket 21 and a carbon fiber tray 22. The tray bracket 21 is installed on the bracket 10, the carbon fiber tray 22 is installed on the tray bracket 21, and a carbon fiber tow 23 is wound on the carbon fiber tray 22. The carbon fiber tow 23 may be a single-strand or multi-strand continuous carbon fiber tow.

[0046] Further, the tray bracket 21 is installed between the bracket 10 and the carbon fiber feeding device 20.

[0047] As Figure 1 and 2 shown in the figure, the resin extrusion device 30 is a part for supplying ultraviolet light-curing resin. It may include a resin storage tank 31, a resin push rod 32, and a motor 33. The resin storage tank 31 is installed 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. The motor 33 is used to drive the resin push rod 32 to move along the axis A of the resin push rod 32, thereby extruding the resin in the resin storage tank 31.

[0048] Further, in this embodiment, the motor 33 may be a stepping motor.

[0049] As Figure 2 shown in the figure, in this embodiment, the resin extrusion device 30 may further be provided with a lead screw 34. One end of the lead 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 lead screw 34 to rotate, and the lead screw 34 then drives the resin push rod 32 to move in the axis A.

[0050] Further, as Figure 2 shown in the figure, the resin extrusion device 30 may further be provided with a guiding device, so that the resin push rod 32 only moves along the axis A of the resin push rod 32 without rotating, and then by adjusting the motor speed, the resin extrusion device 30 can accurately extrude the resin. Specifically, the guiding device may include a guide rail 35 and a support block 36.

[0051] 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 installed at one end of the bracket 10 close to the motor 33, and serves to support the guide rail 35. Through the sliding fit between the guide rail 35 and the mounting hole of the resin push rod 32, the resin push rod 32 does not rotate during the movement.

[0052] Further, multiple guide rails 35 can be provided. In this embodiment, 4 guide rails 35 are provided.

[0053] As Figure 3 shown, the mixing nozzle 40 is a component for realizing the co-extrusion of carbon fiber and resin. The mixing nozzle 40 is connected to the resin storage tank 31, and it 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. Among them, the resin feed hole 42 communicates 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.

[0054] Further, the length of the nozzle 44 should not be too short, and the specific length can be adjusted according to the actual printing situation. In this way, it is possible to prevent ultraviolet rays from irradiating the connection area between the nozzle and the mixing chamber, thereby preventing the resin stored inside the connection area from curing. In addition, during 3D printing, the robotic arm can reach deeper areas, which can avoid accidental collisions caused by fixing the print head on the robotic arm and singularities that cannot be reached when calculating the path.

[0055] For example, in this embodiment, the nozzle 44 can be a standard part with a length of 75 mm, and its 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.

[0056] Further, as Figure 3 shown, the mixing nozzle 40 can further include a nozzle support 45, and this support can support the nozzle 44. Since the nozzle 44 is a slender cylindrical shape, the nozzle support 45 can prevent the nozzle 44 from bending during printing. The nozzle support 45 is installed at the other end of the mixing chamber 43. Specifically, the fiber feed hole 41, the mixing chamber 43, and the nozzle 44 are coaxially arranged in sequence, and the end of the nozzle support 45 away from the mixing chamber 43 can support the end of the nozzle 44 away from the mixing chamber 43. The central axis of the resin feed hole 42 is arranged at 90 degrees to the central axis of the fiber feed hole 41.

[0057] Further, in this embodiment, a cavity is provided inside the mixing chamber 43. In order to prevent the resin in the mixing chamber 43 from flowing back through the fiber feed hole 41, the cross-section of the middle part of the cavity inside the mixing chamber 43 is larger than the cross-sections of its two end parts. In this way, the resin in the mixing chamber 43 can be fully mixed with the carbon fiber tow 23, while ensuring the smooth progress of the co-extrusion process.

[0058] Furthermore, to prevent the resin inside the nozzle 44 from curing after being irradiated by the ultraviolet emission device 50, the nozzle 44 and the nozzle support 45 are made of a metal material with strong ultraviolet resistance, effectively blocking ultraviolet light and ensuring the continuity and reliability of the printing process.

[0059] Preferably, in this embodiment, the materials of the nozzle 44 and the nozzle support 45 are 304 stainless steel.

[0060] As Figure 1 shown, the ultraviolet emission device 50 is a component for quickly curing the resin. It 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, enabling the continuous carbon fiber composite material to be instantaneously formed during the printing process.

[0061] Furthermore, in this embodiment, the ultraviolet emitter 51 can use an ultraviolet lamp in the 405nm band.

[0062] As Figure 4 and Figure 6 shown, the ultraviolet emission device 50 is also provided with an adjustment mechanism for adjusting the irradiation angle of the ultraviolet emitter 51. The adjustment mechanism includes a worm 52, a plurality of turbines 53, and an angle adjustment knob 54. The angle adjustment knob 54 is installed at the end of the worm 52, and the plurality of turbines 53 are engaged with the worm 52 and are evenly distributed in the circumferential direction of the worm 52. Each turbine 53 is connected to an ultraviolet emitter 51. By rotating the angle adjustment knob 54, the worm 52 drives the plurality of turbines 53 to rotate, thereby synchronously adjusting the angles of the plurality of ultraviolet emitters 51.

[0063] Furthermore, as Figure 1 shown, both the worm 52 and the angle adjustment knob 54 are provided with hollow channels inside, enabling the carbon fiber tow 23 to pass through the ultraviolet emission device 50 and enter the fiber feed hole 41 of the mixing nozzle 40.

[0064] As Figure 5 shown, the ultraviolet emission device 50 further includes an upper housing 55 and a lower housing 56. The upper housing 55 and the lower housing 56 are fixedly connected by a connecting member to facilitate fixing the adjustment mechanism. Among them, the upper housing 55 is located on the side of the worm 52 close to the angle adjustment knob 54; the lower housing 56 is located on the side of the worm 52 away from the angle adjustment knob 54, and the lower housing 56 is connected to the resin extrusion device 30 and the mixing nozzle 40.

[0065] As Figure 4As shown, the ultraviolet emission device 50 is further provided with a support assembly for fixing the ultraviolet emitter. Specifically, the support assembly includes a turbine emitter bracket 57 and a mounting shaft 58. The turbine 53 is mounted to the mounting shaft 58, the turbine emitter bracket 57 is connected to the turbine 53, the ultraviolet emitter 51 is mounted to the turbine 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 about the axis of the mounting shaft 58.

[0066] The worm 52 can be rotatably connected to the upper housing 55 and the lower housing 56. The upper housing 55 and the lower housing 56 define the axial position of the worm 52, but the upper housing 55 and the lower housing 56 allow the worm 52 to rotate about its axis.

[0067] Furthermore, a turbine with a suitable central angle can be selected according to the angle by which the ultraviolet emitter 51 can be adjusted. Preferably, in this embodiment, the turbine 53 does not have to be circular, and it can be substantially fan-shaped, and the central angle corresponding to its external teeth can be less than 180 degrees.

[0068] Furthermore, the turbine 53 and the support assembly can be integrally formed, for example, by machining, stamping, etc.

[0069] In this embodiment, as Figure 4 and 5 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 turbine emitter bracket 57 of the support assembly.

[0070] Figure 6 The direction of angle adjustment of the ultraviolet emitter 51 is schematically shown in [], and the dotted arrow therein shows the ultraviolet irradiation direction of the ultraviolet emitter 51. By adjusting the angle of the emitter, the focal position of the emitter can be adjusted, so that the resin can be quickly and evenly cured after extrusion, thereby preventing adhesion and further affecting the subsequent printing process.

[0071] 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 robotic arm, so that the print head is fixed to the robotic arm, thereby realizing precise movement along a complex path. Specifically, the fixing member can include a fixing base 60 and an adapter 61.

[0072] As Figure 8 shown, the fixing base 60 can be mounted on one end of the bracket 10 away from the material tray bracket 21, and it can be fixedly connected to the end of the robotic arm.

[0073] As 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 is provided with 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 constitute the three ends of the T-shaped structure, and the second connection end 612 and the third connection end 613 are located at the two ends of a straight passage.

[0074] 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 the 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, through the adapter 61, the fixed position and printing direction can be flexibly adjusted to meet actual printing needs.

[0075] Furthermore, the fixed base 60 can be fixedly connected to the flange at the end of the robot arm. Specifically, the robot arm can be a 6-axis robot arm. In one example, by combining with the 6-axis robot arm, the print head can move accurately on a complex curved surface, achieving high-performance printing of special-shaped parts, and further improving the printing accuracy and automation level.

[0076] Figure 10 The figure is a schematic diagram of the motor speed adjustment process of the print head of the present application. Specifically, the speed of the target motor can be calculated according to the winding speed of the mechanical arm on which the print head is installed. The speed of the print head motor 33 is adjusted to extrude the resin evenly, thereby ensuring that the resin is evenly coated on the carbon fiber tow until the printing is completed. In one example, a mechanical arm can pull the carbon fiber to be wound onto the printed product, and the print head can extrude the carbon fiber and resin to achieve printing.

[0077] The present application also provides a printing method using a photocuring 3D printing head of a continuous carbon fiber composite material, which may include the following steps.

[0078] The speed of the motor 33 is adjusted so that the resin extrusion device 30 extrudes the resin quantitatively. The resin and the carbon fiber tow 23 are fully mixed in the mixing chamber 43, and then the mixture is extruded through the nozzle 44. The ultraviolet emitter 51 irradiates the mixture extruded by the nozzle 44, thereby curing the mixture.

[0079] Furthermore, the method also includes a calibration step for the ultraviolet emitter 51 , and according to the specific printed part, the ultraviolet emitter 51 is precisely adjusted in angle by adjusting the worm and the turbine emitter bracket.

[0080] Further, a preparation step may also be included, that is, winding the carbon fiber tow 23 around the fiber spool 12 and stably installing the print head at the end of the robotic arm through a fixing member.

[0081] By adopting the above solution, the light-curing 3D print head for continuous carbon fiber composites provided by the present application ensures efficient winding and rapid curing during the printing process by co-extruding continuous carbon fiber and ultraviolet curable resin. Combined with a 6-axis robotic arm, the print head can accurately move along complex paths to achieve the printing of high-performance shaped parts. During the printing process, the high precision and flexibility of the robotic arm enable the carbon fiber to be accurately wound and laid at the designated position, which is particularly suitable for the manufacture of high-strength and lightweight composite structural parts.

[0082] This automated and highly accurate printing method not only improves the manufacturing efficiency, reduces the dependence on manual operations, but also significantly reduces the production cost of carbon fiber composites, and 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, Comprising: A bracket (10); A carbon fiber feeding device (20), which includes a tray bracket (21) and a carbon fiber tray (22); the tray bracket (21) is mounted on the bracket (10), the carbon fiber tray (22) is mounted on the tray bracket (21), and a carbon fiber tow (23) is wound on the carbon fiber tray (22); A resin extrusion device (30), which includes 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), which is connected to the resin storage tank (31) and includes a fiber feeding hole (41), a resin feeding hole (42), a mixing chamber (43) and a nozzle (44), the fiber feeding hole (41) and the resin feeding 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 feeding hole (42) is communicated with the resin storage tank (31) so that the resin can enter the resin feeding hole (42), the carbon fiber tow (23) passes through the fiber feeding hole (41), and 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 emission device (50), which is mounted on the mixing nozzle (40) and includes one or more ultraviolet emitters (51) for irradiating and curing the mixture extruded from the nozzle (44).

2. The photocuring 3D printing head for continuous carbon fiber composite materials according to claim 1, wherein The mixing nozzle (40) further includes a nozzle support (45) that supports the nozzle (44); the nozzle support (45) is mounted on the other end of the mixing chamber (43), and the fiber feeding 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 feeding hole (42) is set at 90 degrees to the central axis of the fiber feeding hole (41).

3. The photocuring 3D printing head for continuous carbon fiber composite materials according to claim 2, wherein The interior of the mixing chamber (43) is provided with a channel, and the cross section of the middle part of the channel is larger than that of its two end parts, which can prevent the resin in the mixing chamber (43) from flowing back through the fiber feeding hole (41).

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

5. The photocuring 3D printing head for continuous carbon fiber composite materials according to claim 1, wherein, The ultraviolet emission device (50) is provided with an adjustment mechanism for adjusting the irradiation angle of the ultraviolet emitter (51); The adjusting mechanism includes a worm (52), a plurality of turbines (53) and an angle adjusting knob (54). The angle adjusting knob (54) is installed at the end of the worm (52). The plurality of turbines (53) are meshed with the worm (52) and are evenly distributed in the circumferential direction of the worm (52). Each turbine (53) is connected to an ultraviolet emitter (51). By rotating the angle adjusting knob (54), the worm (52) drives the plurality of turbines (53) to rotate, so as to synchronously adjust the angles of the plurality of ultraviolet emitters (51).

6. The light-curing 3D printing head for continuous carbon fiber composite materials according to claim 5, wherein Both the worm (52) and the angle adjusting knob (54) are internally provided with hollow channels, so that the carbon fiber tow (23) can pass through the ultraviolet emitting device (50) and enter the fiber feed hole (41) of the mixing nozzle (40).

7. The photocuring 3D printing head for continuous carbon fiber composite materials according to claim 5, characterized in that, The ultraviolet emitting device (50) further includes an upper housing (55) and a lower housing (56). The upper housing (55) and the lower housing (56) are fixedly connected for fixing the adjusting mechanism. Among them, the upper housing (55) is located on one side of the worm (52) close to the angle adjusting knob (54), and the lower housing (56) is located on one side of the worm (52) far from the angle adjusting knob (54). The lower housing (56) is connected to the resin extrusion device (30) and the mixing nozzle (40).

8. The light-curing 3D printing head for continuous carbon fiber composite materials according to claim 7, characterized in that, The ultraviolet emitting device (50) is further provided with a support assembly for fixing the ultraviolet emitter (51). The support assembly includes a turbine emitter bracket (57) and a mounting shaft (58). Among them, the turbine (53) is installed on the mounting shaft (58), the turbine emitter bracket (57) is connected to the turbine (53), the ultraviolet emitter (51) is installed on the turbine 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 around the axis of the mounting shaft (58) relative to the upper housing (55) and the lower housing (56).

9. The photocuring 3D printing head for continuous carbon fiber composite materials according to claim 1, characterized in that It further includes a fixing member. The fixing member includes a fixing base (60). The fixing base (60) can be installed at one end of the bracket (10) far from the tray bracket (21) and is fixedly connected to the end of the robotic arm. Alternatively, it further includes a fixing member, and 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 connection end (611), a second connection end (612) and a third connection end (613), the first connection end (611) can be connected to the resin storage tank (21), 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 respectively communicated with the mixing nozzle (40) and the resin storage tank (31), and the resin can enter the resin feed hole (42) through the adapter (61); the third connection end (613) can be connected to the fixing base (60) and fixedly connected to the end of the robotic arm, and the first connection end (611), the second connection end (612) and the third connection end (613) form three ends of a T-shaped structure, and the second connection end (612) and the third connection end (613) are located at both ends of a straight passage.

10. A printing method for continuous carbon fiber composite materials, characterized in that, Using the photocuring 3D print head for continuous carbon fiber composite materials according to any one of claims 1 to 9, the printing method includes: Extrusion step: adjusting the rotation speed of the motor (33) so that the resin extrusion device (30) extrudes the resin quantitatively; enabling the resin and the carbon fiber tow (23) to be fully mixed in the mixing chamber (43), and then extruding the mixture through the nozzle (44); and Curing step: irradiating the mixture extruded from the nozzle (44) by the ultraviolet emitter (51), thereby curing the mixture into a molded product.

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