Photocuring auxiliary extrusion type 3D printing nozzle mechanism and printing device

Abstract

The photocuring auxiliary extrusion type 3D printing spray head mechanism comprises an extrusion mechanism, at least one set of light source assembly is arranged on the periphery of the lower portion of the extrusion mechanism, the same set of light source assembly comprises two light source assemblies which are oppositely arranged and symmetrically distributed relative to the axis of the extrusion mechanism, and each light source assembly comprises a light source; the light source is fixedly connected with one end of the first connecting rod, the other end of the first connecting rod is rotationally connected with the bottom end of the second connecting rod, the top end of the second connecting rod is rotationally connected with one end of the third connecting rod, and the other end of the third connecting rod is connected to the rotating piece. The printing nozzle mechanism is high in applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and particularly relates to a photocuring-assisted extrusion type 3D printing nozzle mechanism and a printing device. Background Art

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

[0003] In the field of additive manufacturing, 3D printing technology has brought innovative opportunities to many industries with its unique manufacturing method. Extrusion type 3D printing is one of the widely used printing methods. By extruding printing materials from the nozzle and stacking them layer by layer, a three-dimensional solid model is constructed. However, traditional extrusion type 3D printing has certain limitations in terms of printing accuracy and material forming performance.

[0004] On the one hand, when pursuing high-precision printing, the materials extruded from the nozzle are prone to problems such as deformation and diffusion, making it difficult to improve the printing accuracy. For example, when printing fine parts or complex structures, tiny errors will affect the quality and function of the product. On the other hand, for some special materials, such as biomaterials and high-strength engineering plastics with special performance requirements, it is difficult to meet their curing and forming requirements solely by extrusion type printing, which affects the full play of material properties.

[0005] To solve the above problems, photocuring-assisted extrusion type 3D printing technology has emerged. By introducing a photocuring mechanism, the forming process of printing materials is improved, and the printing accuracy and material properties are enhanced. However, in the current photocuring-assisted extrusion type 3D printing technology, a light source is provided on one side of the nozzle, and the relative position between the light source and the nozzle is fixed. A single light source cannot cure the printing materials sufficiently and uniformly, and the fixed position of the light source cannot meet the optimal irradiation angle, irradiation position, and irradiation distance required by different printing materials, affecting the quality of the workpiece and making the applicability of the entire nozzle poor. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a photocuring-assisted extrusion type 3D printing nozzle mechanism and a printing device, which can realize the adjustment of the relative position between the light source and the nozzle, meet the photocuring requirements of different printing materials, and improve the printing quality of the workpiece.

[0007] To achieve the above purpose, the present invention is realized by the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a photo-curing assisted extrusion type 3D printing nozzle mechanism, including an extrusion mechanism. At least one set of light source components is provided on the outer periphery below the extrusion mechanism. The same set of light source components includes two light source components that are oppositely arranged and symmetrically distributed with respect to the axis of the extrusion mechanism. The light source component includes a light source, the light source is fixedly connected to one end of a first connecting rod, the other end of the first connecting rod is rotatably connected to the bottom end of a second connecting rod, the top end of the second connecting rod is rotatably connected to one end of a third connecting rod, the other end of the third connecting rod is connected to a rotating member, and the rotating member is rotatably connected to a sleeve. The sleeve is sleeved and fixed on the outer periphery of the extrusion mechanism.

[0009] Optionally, a first locking component is provided between the first connecting rod and the second connecting rod to lock and fix the first connecting rod and the second connecting rod.

[0010] Optionally, a second locking component is provided between the second connecting rod and the third connecting rod to lock and fix the second connecting rod and the third connecting rod.

[0011] Optionally, a locking mechanism is provided between the rotating member and the sleeve to lock and fix the rotating member and the sleeve.

[0012] Optionally, the locking mechanism includes an elastic member. The elastic member is arranged in an installation groove opened on the outer cylindrical surface of the sleeve. One end of the elastic member is fixedly connected to the groove surface of the installation groove, and the other end abuts against a locking ball. Correspondingly, a plurality of spherical grooves matching the locking balls are provided along the circumferential direction on the inner ring surface of the rotating member.

[0013] Optionally, along the circumferential direction of the rotating member, adjacent spherical grooves are arranged at an interval of 5° - 6°.

[0014] Optionally, an annular groove is opened on the outer cylindrical surface of the sleeve, and an annular boss is provided on the inner ring surface of the rotating member and is embedded in the annular groove. The annular boss is rotatably connected to the sleeve through the annular groove.

[0015] Optionally, the light source adopts an LED ultraviolet lamp integrated with a light intensity sensor or a digital light processing light source.

[0016] In a second aspect, an embodiment of the present invention provides a photo-curing assisted extrusion type 3D printing device, including the photo-curing assisted extrusion type 3D printing nozzle mechanism described in the first aspect.

[0017] Optionally, the extrusion mechanism is connected to a lifting mechanism, the lifting mechanism is connected to a first horizontal moving mechanism, a printing platform is provided below the extrusion mechanism, the printing platform is connected to a second horizontal moving mechanism, and the output movement directions of the first horizontal moving mechanism and the second horizontal moving mechanism are perpendicular to each other.

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

[0019] 1. The printing nozzle of the present invention is provided with at least one set of light source components. The same set includes two oppositely arranged light source components, which can fully irradiate the printing material, prevent insufficient curing, improve the curing rate. At the same time, the light source can adjust its position and angle through the first connecting rod, the second connecting rod and the rotating member, realizing the adjustment of the irradiation angle, irradiation position and irradiation distance of the light source on the printing material, meeting the optimal irradiation parameter requirements of different printing materials, meeting the workpiece printing quality requirements of different printing materials, and improving the applicability of the entire nozzle mechanism.

[0020] 2. In the printing nozzle of the present invention, since it is inconvenient to measure the rotation angle of the rotating member relative to the sleeve with an angle measuring tool, a spring, a locking ball and a spherical groove are provided. When the spring pushes the locking ball into the spherical groove, a sound will be emitted, which is convenient for the staff to record the number of spherical grooves passed by the rotating member during rotation and convenient for controlling the rotation angle of the rotating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0023] Figure 2 is a schematic diagram of the photocuring mechanism of Embodiment 1 of the present invention;

[0024] Figure 3 is a schematic diagram of the cooperation between the sleeve and the rotating member of Embodiment 1 of the present invention;

[0025] Figure 4 is a schematic diagram of the locking mechanism of Embodiment 1 of the present invention;

[0026] Among them, 1. material cylinder, 2. extrusion assembly, 3. photocuring mechanism, 4. printing platform;

[0027] 3-1. light source, 3-2. first connecting rod, 3-3. second connecting rod, 3-4. third connecting rod, 3-5. damping rotating shaft, 3-6. rotating member, 3-7. sleeve, 3-8. locking mechanism;

[0028] 3-6-1. annular boss;

[0029] 3-8-1. spring, 3-8-2. steel ball, 3-8-3. spherical groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] For the convenience of description, in the present invention, if the words "upper" and "lower" appear, they only indicate the same upper and lower directions as those of the attached drawings themselves, and do not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] Embodiment 1

[0032] This embodiment provides a light-curing assisted extrusion type 3D printing nozzle mechanism. As Figure 1 shown, it includes an extrusion mechanism. The extrusion mechanism can adopt the extrusion mechanism of an existing light-curing assisted extrusion type 3D printing device. The extrusion mechanism includes a barrel 1. The bottom end of the barrel 1 is connected to the nozzle through a feeding pipeline. A pressure sensor is installed on the feeding pipeline, and an extrusion assembly 2 is provided at the top end. The extrusion assembly 2 is used to extrude the printing material in the barrel 1 from the nozzle. The barrel 1 is provided with a heating element and a temperature sensor, which can accurately adjust the temperature of the material in the barrel according to the characteristics of different printing materials, change the viscosity and fluidity of the material, and make it reach the best state before extrusion, avoiding the problem of poor extrusion caused by inappropriate material temperature. The extrusion mechanism of this embodiment can adopt the existing technology, and its further technical details will not be described in detail here.

[0033] A light-curing mechanism 3 is provided on the outer periphery below the nozzle, which is used to irradiate the printing material extruded from the nozzle with light of a set wavelength.

[0034] In this embodiment, the printing material includes photosensitive resin, additives, and other functional components added according to requirements. During printing, the heating module at the barrel makes the printing material reach an appropriate viscosity and then flows to the nozzle through the conveying pipeline. While the nozzle extrudes the printing material, the light source of the light-curing system emits light of a specific wavelength to irradiate the extruded material. The photosensitive resin rapidly undergoes a polymerization reaction under the action of light to achieve solidification and forming.

[0035] In traditional 3D printing devices, the light source of the light-curing mechanism is one and its relative position to the nozzle is fixed and cannot be adjusted. The single light source cannot achieve sufficient curing of the printing material, reducing the curing efficiency. At the same time, the fixed position of the light source makes the irradiation position, irradiation angle, and irradiation distance of the light source on the printing material determined and cannot be adjusted. The irradiation position, irradiation angle, and irradiation distance of the light source on the printing material affect the propagation mode of light in the printing material. The optimal irradiation position, irradiation angle, and irradiation distance of different printing materials are different. Since the relative position between the light source and the nozzle cannot be adjusted, it is very likely that the printing material cannot be irradiated at the optimal irradiation position, irradiation angle, and irradiation distance, resulting in poor curing effect and affecting the quality of the workpiece.

[0036] Therefore, in this embodiment, the light curing mechanism is improved. The light curing mechanism of this embodiment includes multiple groups of light source components located around the periphery below the nozzle. The light source components in the same group include two relatively arranged light source components, that is, the two light source components are arranged at a circumferential interval of 180° with respect to the extrusion mechanism, and at the same time, the two light source components are symmetrically arranged with respect to the center line of the extrusion mechanism.

[0037] As Figure 2 shown, the light source component includes a light source 3-1. In this embodiment, the light source 3-1 uses an existing LED ultraviolet lamp or digital light processing light source integrated with a light intensity sensor. The light source can use existing equipment and will not be described in detail here.

[0038] The LED ultraviolet lamp and digital light processing (DLP) light source can provide stable and high-intensity light, ensuring that the light uniformly covers the printing material extruded by the nozzle.

[0039] The light intensity is monitored in real time through the light intensity sensor, and the data is fed back to the control system to dynamically adjust the power of the light source, ensuring the stability and consistency of the light curing process.

[0040] In this embodiment, one group of light source components is provided. Using two light sources can achieve sufficient curing of the printing material, minimizing the improvement cost while ensuring the curing effect.

[0041] The light source 3-1 is fixedly connected to one end of the first connecting rod 3-2. The first connecting rod 3-2 is perpendicular to the axis of the light source 3-1. The other end of the first connecting rod 3-2 is rotatably connected to one end of the second connecting rod 3-3.

[0042] In one implementation, the first connecting rod 3-2 and the second connecting rod 3-3 are rotatably connected through a damping rotating shaft 3-4. The first connecting rod 3-2 and the second connecting rod 3-3 are locked and fixed by the friction force between the rotating shaft. Only when the external force is greater than the friction force can the first connecting rod 3-2 and the second connecting rod 3-3 rotate relative to each other.

[0043] Specifically, the insertion block at the end of the second connecting rod 3-3 is inserted into the slot at the end of the first connecting rod 3-2, and a damping rotating shaft passes through the insertion block and the slot.

[0044] In the second implementation, a first locking component is provided between the first connecting rod 3-2 and the second connecting rod 3-3 to lock and fix the first connecting rod and the second connecting rod. Bolts pass through the connecting ends of the first connecting rod 3-2 and the second connecting rod 3-3, and nuts are connected to the bolts. The connecting ends of the first connecting rod and the second connecting rod are pressed and fixed by the nut and the head of the bolt. The nut serves as the first locking component. When the nut is loosened, the first connecting rod and the second connecting rod can rotate around the rod portion of the bolt, thereby realizing angle adjustment.

[0045] The other end of the second link 3-3 is rotatably connected to one end of the third link 3-4, and the rotational connection method is the same as that between the second link 3-3 and the first link 3-2. Specifically:

[0046] In one embodiment, the second link 3-3 and the third link 3-4 are rotatably connected by a damping rotating shaft 3-5. The second link 3-3 and the third link 3-4 are locked and fixed by the frictional force between them and the damping rotating shaft. Only when the external force is greater than the frictional force can relative rotation occur between the second link 3-3 and the third link 3-4.

[0047] Specifically, the insertion block at the end of the second link 3-3 is inserted into the slot at the end of the third link 3-4, and the damping rotating shaft 3-5 passes through the insertion block and the slot.

[0048] In the second embodiment, a second locking component is provided between the second link 3-3 and the third link 3-4 to lock and fix the second link 3-3 and the third link 3-4. The connecting ends of the second link 3-3 and the third link 3-4 pass through a bolt, and the bolt is connected with a nut. The connecting ends of the second link 3-3 and the third link 3-4 are pressed and fixed by the nut and the head of the bolt. The nut serves as the second locking component. When the nut is loosened, the second link 3-3 and the third link 3-4 can rotate around the rod portion of the bolt, thereby realizing angle adjustment.

[0049] The other end of the third link 3-4 is fixedly connected to the outer ring surface of the rotating member 3-6, and the third link 3-4 is arranged along the radial direction of the rotating member.

[0050] In this embodiment, since the first link 3-2, the second link 3-3, and the third link 3-4 are all rod-shaped structures, the angles between the first link 3-2 and the second link 3-3 and between the second link 3-3 and the third link 3-4 can be conveniently measured by a protractor or other angle measuring tools, which is convenient for the staff to accurately control the position and angle of the light source.

[0051] The rotating member 3-6 adopts an annular structure, which is coaxially sleeved on the outer periphery of the sleeve 3-7 and is rotatably connected to the sleeve 3-7. The sleeve 3-7 is coaxially sleeved on the outer periphery of the cartridge 1 and is fixedly connected to the cartridge.

[0052] Furthermore, in order to facilitate the connection of the rotating member to the sleeve, the rotating member is composed of two semi-annular structures that are detachably connected by bolts or plugging.

[0053] Furthermore, as Figure 3As shown, the inner ring surface of the rotating member 3-6 is provided with an annular boss 3-6-1, and the annular boss is embedded in the annular groove provided on the outer cylinder surface of the sleeve 3-7. The annular boss 3-6-1 is slidably connected to the groove surface of the annular groove. The rotational connection between the rotating member 3-6 and the sleeve 3-7 is realized through the cooperation of the annular boss and the annular groove, and the rotating member can rotate smoothly along its own axial direction.

[0054] In this embodiment, a locking mechanism 3-8 is provided between the rotating member 3-6 and the sleeve 3-7 to achieve locking and fixing between the rotating member and the sleeve.

[0055] The locking mechanism 3-8 can lock and release the rotating member 3-6 and the sleeve 3-7, and can also facilitate the staff to control the rotation angle of the rotating member.

[0056] Specific:

[0057] like Figure 4 As shown, the locking mechanism includes an elastic member, and the elastic member adopts a spring 3-8-1. The spring 3-8-1 is arranged in a mounting groove arranged on the outer cylinder surface of the sleeve 3-7. One end of the spring 3-8-1 is fixed to the groove surface of the mounting groove, and the other end is in contact with a locking ball. Preferably, the locking ball adopts a steel ball 3-8-2. Accordingly, a plurality of spherical grooves 3-8-3 matching the steel balls are arranged along the annular direction on the inner ring surface of the rotating member 3-6, and the steel balls can be embedded in the spherical grooves under the action of the spring.

[0058] The groove surface of the spherical groove 3-8-3 does not exceed half of the spherical surface on which it is located, so that when the rotating member 3-6 rotates, the steel ball 3-8-2 can overcome the elastic force of the spring 3-8-1 and easily escape from the spherical groove 3-8-3.

[0059] The steel ball 3-8-2 can be stuck into the spherical groove 3-8-3 under the elastic force of the spring 3-8-1, thereby realizing the locking fixation between the rotating part 3-6 and the sleeve 3-7.

[0060] In this embodiment, the circumferential spacing angle of adjacent spherical grooves 3-8-3 along the rotating member 3-6 is 5°-6°, preferably 5.5°. Correspondingly, the number of the spherical grooves 3-8-3 is 65.

[0061] When the staff rotates the rotating part, due to the existence of the spherical groove 3-8-3, when the steel ball 3-8-2 rotates to the spherical groove, the spring 3-8-1 will push the steel ball 3-8-2 to the spherical groove 3-8-3 to form a fixation. When the rotating part continues to rotate, the spring 3-8-1 will be compressed, and the steel ball 3-8-2 will temporarily return to the installation groove and be closely together with the spring 3-8-1. When the spring 3-8-1 instantaneously ejects the steel ball 3-8-2 after being compressed, there will be a sound. When the steel ball 3-8-2 falls into the spherical groove 3-8-3, the sound stops, which is convenient to determine whether it is fixed to the determined position during use and also convenient for the staff to determine the rotation angle. During use, the staff can rotate the corresponding number of times according to the needs.

[0062] In this embodiment, since the rotation angle of the rotating part cannot be measured by an angle measuring tool, the arrangement of the spring, steel ball and spherical groove is adopted to facilitate the staff to control the rotation angle of the rotating part.

[0063] The printing nozzle mechanism of this embodiment is provided with two relatively arranged light source components, which can irradiate the printing material sufficiently, prevent insufficient curing, improve the curing rate. At the same time, the light source can realize the adjustment of position and angle through the first connecting rod, the second connecting rod and the rotating part, realizing the adjustment of the irradiation angle, irradiation position and irradiation distance of the light source on the printing material, meeting the optimal irradiation parameter requirements of different printing materials, meeting the workpiece printing quality requirements of different printing materials, and improving the applicability of the entire nozzle mechanism.

[0064] Embodiment 2

[0065] This embodiment provides a light-curing assisted extrusion type 3D printing device, as Figure 1 shown, which is provided with the light-curing assisted extrusion type 3D printing nozzle mechanism described in Embodiment 1. The material cylinder is connected to the lifting mechanism, and the lifting mechanism can drive the material cylinder to lift. In this embodiment, the lifting mechanism adopts a lead screw lifting mechanism driven by a motor, and the lead screw lifting mechanism is connected to the first horizontal moving mechanism. The first horizontal moving mechanism can drive the lead screw lifting mechanism to move along the first horizontal direction, and the first horizontal moving mechanism adopts a lead screw transmission mechanism driven by a motor.

[0066] A printing platform 4 is arranged below the printing head mechanism. The printing platform 4 is connected to the second horizontal moving mechanism, and the second horizontal moving mechanism can drive the printing platform to move along the second horizontal direction. The second horizontal direction is perpendicular to the first horizontal direction.

[0067] The printing platform can adopt an existing printing platform, which has a height adjustment device, a heating element and a temperature sensor, and has the functions of adjustable temperature and height, and the surface has good adhesion and flatness. The platform temperature can be adjusted according to the curing requirements of the printing material to provide a suitable environment for the curing and shaping of the material. The platform height can be accurately controlled to ensure that each layer of printing material can be accurately stacked in the appropriate position, improving the printing accuracy.

[0068] The material extrusion assembly, heating element, lifting mechanism, first horizontal movement mechanism, and second horizontal movement mechanism are all connected to the control system and can receive instructions from the control system to work.

[0069] The temperature sensor and light intensity sensor are connected to the control system and can transmit the detected information to the control system.

[0070] As the core of the entire printing device, the control system receives feedback information from multiple sensors such as the light intensity sensor, temperature sensor, and pressure sensor, and comprehensively regulates the working parameters of the extrusion system, light curing system, and printing platform 4. The control system accurately controls the movement trajectory of the nozzle, the extrusion speed of the printing material, the time and light intensity of light curing, and the temperature and height of the printing platform according to the preset printing model and material characteristic parameters, realizing high-precision 3D printing assisted by light curing.

[0071] For the 3D printing device of this embodiment, only the nozzle mechanism is improved, and the rest of the structure can adopt the existing technology, and its further technical details will not be described in detail here.

[0072] The working method of the printing device of this embodiment includes the following steps:

[0073] Assembly of the printing device: Install according to the overall structure schematic diagram of the light-curing assisted extrusion type 3D printing equipment. After completion of the assembly, conduct preliminary debugging and testing to check whether each part is working properly. Install the nozzle mechanism on the lifting mechanism to ensure that the conveying pipeline between the material barrel and the nozzle is unobstructed. Install a heating element and a temperature sensor on the material barrel and connect them to the control system. Set appropriate temperature parameters through the control system to keep the printing material in good fluidity. Install the printing platform with adjustable temperature and height on the second horizontal movement mechanism and adjust it to a horizontal state through the height adjustment device. Connect the heating element to the control system to accurately control the temperature of the platform according to the printing requirements.

[0074] Prepare printing materials: According to the printing requirements, prepare printing materials containing photosensitive components, load the configured materials into the corresponding cartridges, and at the same time start the heating module and temperature sensor at the cartridge to heat the materials in the cartridge. After the temperature stabilizes within the optimal printing temperature range required for each material, adjust the light source to the target position according to the type of printing material through the rotating member, the first connecting rod, and the second connecting rod, and prepare to start the printing operation.

[0075] Model processing and parameter setting: Input the three-dimensional model data to be printed into the control system. The control system performs layer-by-layer processing on the model according to the set printing accuracy requirements, converting the three-dimensional model into a series of printing paths and parameter information for two-dimensional layers, which serves as the guiding basis for the movement of the nozzle, material extrusion, and photocuring operations during printing. At the same time, according to the characteristics of the model and the properties of the material, parameters such as light intensity, printing speed, printing height, and air pressure are set in the control system.

[0076] Printing process: After starting the printing, during the printing process, according to the structural characteristics and material requirements of different parts of the three-dimensional model, the control system precisely coordinates parameters such as light intensity, nozzle movement speed, material extrusion speed, and the temperature and height of the printing platform. The nozzle moves along the predetermined path and extrudes the printing material under the command of the control system, and the photocuring system simultaneously cures the extruded material layer by layer until the entire three-dimensional model is printed.

[0077] Post-processing: After completing the printing, post-process the printed parts, such as cleaning, polishing, secondary curing, etc., to improve the surface quality and performance of the printed parts and meet the actual application requirements.

[0078] By introducing the photocuring technology, it is possible to effectively control the flow and shaping of the printing materials, reduce the deformation and diffusion after material extrusion, improve the printing accuracy, and meet the requirements for manufacturing fine parts and complex structures. For some materials that are difficult to be cured and formed by traditional extrusion printing, the introduction of the photocuring mechanism enables them to be successfully formed, expanding the application range of 3D printing materials and providing the possibility for the application of new materials. The photocuring process can quickly cure the materials in a short time, forming a denser structure, enhancing the mechanical properties, chemical stability, etc. of the materials, improving the quality and service life of the printed products. The light source is designed near the nozzle, and the light source is connected to the nozzle mechanism through the first connecting rod, the second connecting rod, and the rotating member, and can be irradiated on the nozzle in real time as the nozzle moves, achieving the effect of curing as it extrudes, reducing the support, and accelerating the printing speed and accuracy.

[0079] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and variations can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A photocuring assisted extrusion 3D printing nozzle mechanism, comprising an extrusion mechanism, characterized in that: At least one group of light source assemblies is provided on the lower periphery of the extrusion mechanism, and the same group of light source assemblies includes two light source assemblies that are relatively arranged and symmetrically distributed relative to the axis of the extrusion mechanism. The light source assembly includes a light source, which is fixedly connected to one end of a first connecting rod, and the other end of the first connecting rod is rotatably connected to the bottom end of the second connecting rod. The top end of the second connecting rod is rotatably connected to one end of a third connecting rod, and the other end of the third connecting rod is connected to a rotating member, which is rotatably connected to a sleeve, and the sleeve is sleeved and fixed on the outer periphery of the extrusion mechanism.

2. A light-curing assisted extrusion 3D printing nozzle mechanism as claimed in claim 1, characterized in that: A first locking component is provided between the first connecting rod and the second connecting rod to lock and fix the first connecting rod and the second connecting rod.

3. A photocuring assisted extrusion 3D printing nozzle mechanism as claimed in claim 1, characterized in that: A second locking component is provided between the second connecting rod and the third connecting rod to lock and fix the second connecting rod and the third connecting rod.

4. A photocuring assisted extrusion 3D printing nozzle mechanism as claimed in claim 1, characterized in that: A locking mechanism is provided between the rotating member and the sleeve to lock and fix the rotating member and the sleeve.

5. A light-curing assisted extrusion 3D printing nozzle mechanism as claimed in claim 4, characterized in that: The locking mechanism includes an elastic member, which is arranged in a mounting groove opened on the outer cylinder surface of the sleeve. One end of the elastic member is fixedly connected to the groove surface of the mounting groove, and the other end is abutted against a locking ball. Correspondingly, the inner ring surface of the rotating member is provided with a plurality of spherical grooves matching the locking balls along the annular direction.

6. A light-curing assisted extrusion 3D printing nozzle mechanism as claimed in claim 5, characterized in that: Along the circumferential direction of the rotating member, adjacent spherical grooves are arranged at intervals of 5°-6°.

7. A photocuring assisted extrusion 3D printing nozzle mechanism as claimed in claim 1, characterized in that: An annular groove is formed on the outer cylindrical surface of the sleeve, and an annular boss embedded in the annular groove is formed on the inner annular surface of the rotating member. The annular boss is rotatably connected to the sleeve via the annular groove.

8. The photocuring assisted extrusion 3D printing nozzle mechanism according to claim 1, characterized in that: The light source is an LED ultraviolet lamp or a digital light processing light source integrated with a light intensity sensor.

9. A light-curing assisted extrusion 3D printing device, characterized in that: It comprises the photo-curing assisted extrusion type 3D printing nozzle mechanism as described in any one of claims 1 to 8.

10. The photo-curing assisted extrusion 3D printing device according to claim 9, characterized in that: The extrusion mechanism is connected to the lifting mechanism, the lifting mechanism is connected to the first horizontal moving mechanism, a printing platform is provided below the extrusion mechanism, the printing platform is connected to the second horizontal moving mechanism, and the output movement directions of the first horizontal moving mechanism and the second horizontal moving mechanism are perpendicular to each other.

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