3D printing nozzle and 3D printing forming method

Abstract

The invention relates to a 3D printing nozzle and a 3D printing forming method.The 3D printing nozzle comprises a first infusion channel, a second infusion channel, a third infusion channel and a fourth infusion channel which are sequentially arranged from inside to outside, and a nozzle body is provided with a center line, a first end and a second end; the outlet end part of the first infusion channel, the outlet end part of the second infusion channel, the outlet end part of the third infusion channel and the outlet end part of the fourth infusion channel are sequentially distributed from high to low; the extending directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all inclined relative to the center line. Due to the fact that the infusion channels are obliquely arranged, the printing materials on the outer layer can extrude the printing materials on the inner layer, the printing materials between the adjacent layers can be tightly attached, the outlet ends of the infusion channels are sequentially distributed from high to low, the bonding time of the printing materials between the adjacent layers can be prolonged, and the bonding efficiency of the printing materials between the adjacent layers is improved. And the structural stability of the printed FASC device is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing nozzle and a 3D printing method. Background Art

[0002] 3D printing, also known as three-dimensional printing, is a type of rapid prototyping technology that uses powdered metal or plastic and other bondable materials to construct parts through layer-by-layer printing. 3D printing is usually achieved using digital technology material printers. It is often used to make models in the fields of mold manufacturing, industrial design, etc., and later gradually used for the direct manufacturing of some products. There are already parts printed using this technology.

[0003] The 3D printing nozzle is adapted to the 3D printing direct coherent multi-ink writing (DCMW) technology, which can directly print a complete FASC device in a single step. It is used to manufacture high-performance fiber-shaped asymmetric supercapacitors (FASCs), which can be used in wearable electronic devices, flexible displays, medical devices, portable electronic devices and flexible robots.

[0004] Currently known FASCs have three structural types: parallel, twisted, and coaxial. Although the existing extruder can directly print out four-layer coaxial FASC devices, the four-layer printing channels of the existing extruder are coaxial and parallel, which makes the adhesion between adjacent layers of the printed FASC device not high, and the layers of the FASC device are not tightly wrapped, resulting in an unstable structure of the printed FASC device. In addition, since the size of the existing extruder head occupies too much space, it is not conducive to setting a heating ring on the outside of the extruder head. Summary of the invention

[0005] The first object of the present invention is to provide a 3D printing nozzle, which aims to solve the problem that the structure of the FASC device printed by the existing 3D printing nozzle is unstable and it is not conducive to setting a heating ring on the outside of the 3D printing nozzle.

[0006] In order to solve the above technical problems, a 3D printing nozzle is provided, comprising:

[0007] The nozzle body comprises a first infusion channel, a second infusion channel, a third infusion channel and a fourth infusion channel which are arranged in sequence from the inside to the outside, the nozzle body having a center line, a first end and a second end, in the direction from the first end to the second end, the outlet end of the first infusion channel, the outlet end of the second infusion channel, the outlet end of the third infusion channel and the outlet end of the fourth infusion channel are distributed in sequence from high to low; the extension directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all arranged obliquely relative to the center line.

[0008] Further, let the distance between the outlet end of the first infusion channel and the outlet end of the second infusion channel be L1, let the distance between the outlet end of the second infusion channel and the outlet end of the third infusion channel be L2, let the distance between the outlet end of the third infusion channel and the outlet end of the fourth infusion channel be L3, wherein L1, L2 and L3 decrease successively.

[0009] Further, let the distance between the outlet end of the first infusion channel and the outlet end of the second infusion channel be L1, let the distance between the outlet end of the second infusion channel and the outlet end of the third infusion channel be L2, let the distance between the outlet end of the third infusion channel and the outlet end of the fourth infusion channel be L3, wherein L1, L2 and L3 are equal.

[0010] Furthermore, the extending directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all inclined at the same angle relative to the center line, and the inclined angle is within the range of [3°, 5°].

[0011] Furthermore, the nozzle body also includes a pipeline group, which extends in the direction from the second end toward the first end, and includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline respectively connected to the first infusion channel, the second infusion channel, the third infusion channel and the fourth infusion channel.

[0012] Furthermore, the nozzle body also includes a main body, the pipeline group is connected to the main body, and the maximum outer diameter of the main body is D1, and the maximum outer diameter of the pipeline group is D2, wherein D1 / D2≥0.5.

[0013] Further, in the direction from the first end to the second end, the aperture of the first infusion channel gradually decreases.

[0014] Furthermore, the nozzle body also includes a first nozzle, a second nozzle, a third nozzle and a fourth nozzle which are detachably connected in sequence, the first infusion channel is formed on the first nozzle, the second infusion channel is formed on the second nozzle, the third infusion channel is formed on the third nozzle, and the fourth infusion channel is formed on the fourth nozzle.

[0015] Furthermore, the 3D printing nozzle also includes a heating ring and a fixing seat, the fixing seat is formed with a mounting cavity, the nozzle body is fixed in the mounting cavity, and the heating ring is arranged in the mounting cavity and nested outside the nozzle body.

[0016] The second object of the present invention is to provide a 3D printing molding method, which is applied to the 3D printing nozzle, and the method includes: when starting infusion, the time of starting infusion is arranged from early to late as the first infusion channel, the second infusion channel, the third infusion channel and the fourth infusion channel.

[0017] Implementing the embodiments of the present invention will have the following beneficial effects:

[0018] In the 3D printing nozzle in this embodiment, since the extension directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all inclined relative to the center line, when the 3D printing nozzle is in use, the printing material output by the outer infusion channel wraps the printing material output by the inner infusion channel, and the inclination angle is set so that the printing material of the outer layer can squeeze the printing material of the inner layer, so that the printing materials between adjacent layers can be closely attached. In addition, the outlet end of the first infusion channel, the outlet end of the second infusion channel, the outlet end of the third infusion channel and the outlet end of the fourth infusion channel are distributed from high to low in sequence, and the printing material is first infused from the first infusion channel. After a period of time, the printing material in the second infusion channel is then infused, and so on until the printing material in the fourth infusion channel is infused. Through the height difference between the infusion channels and the time difference of infusion, on the one hand, it is beneficial to prolong the bonding time of the printing materials between adjacent layers, and on the other hand, in the initial bonding stage, bonding is sequentially performed from the inside to the outside, which further improves the structural stability of the printed FASC device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a 3D printing nozzle according to an embodiment of the present invention;

[0021] Figure 2 A cross-sectional view of a 3D printing nozzle according to an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the nozzle body according to an embodiment of the present invention;

[0023] Figure 4 A top view of the nozzle body according to an embodiment of the present invention;

[0024] Figure 5It is a cross-sectional view of the nozzle body described in the embodiment of the present invention.

[0025] Among them: 100, 3D printing nozzle; 110, nozzle body; 111, first nozzle; 1111, first infusion channel; 112, second nozzle; 1121, second infusion channel; 113, third nozzle; 1131, third infusion channel; 114, fourth nozzle; 1141, fourth infusion channel; 115, center line; 116, first end; 117, second end; 118, pipeline group; 1181, first pipeline; 1182, second pipeline; 1183, third pipeline; 1184, fourth pipeline; 119, main body; 120, heating collar; 130, fixing seat; 131, mounting cavity; α, tilt angle. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Please refer to Figure 1-Figure 5The embodiment of the present invention provides a 3D printing nozzle 100, which includes a nozzle body 110. The nozzle body 110 includes a first infusion channel 1111, a second infusion channel 1121, a third infusion channel 1131 and a fourth infusion channel 1141 which are sequentially arranged from the inside to the outside. The nozzle body 110 has a center line 115, a first end 116 and a second end 117. In the direction from the first end 116 to the second end 117, the outlet end of the first infusion channel 1111, the outlet end of the second infusion channel 1121, the outlet end of the third infusion channel 1131 and the outlet end of the fourth infusion channel 1141 are sequentially distributed from high to low; the extension directions of the second infusion channel 1121, the third infusion channel 1131 and the fourth infusion channel 1141 are all arranged obliquely relative to the center line 115. Exemplarily, the first infusion channel 1111 extends along the center line 115, which is equivalent to the first infusion channel 1111 extending in the vertical direction. When printing, the printed material in the first infusion channel 1111 flows in the vertical direction. In addition, it should be noted that the first infusion channel 1111 is used to infuse positive electrode materials (V2O5 nanowires / multi-walled carbon nanotubes), the second infusion channel 1121 is used to infuse gel electrolytes, the third infusion channel 1131 is used to infuse negative electrode materials (VN nanowires / multi-walled carbon nanotubes), and the fourth infusion channel 1141 is used to infuse gel electrolytes. In other words, the gel electrolyte output by the second infusion channel 1121 separates the positive electrode material and the negative electrode material, and the gel electrolyte output by the fourth infusion channel 1141 is used to protect the positive electrode material and the negative electrode material located in the inner layer.

[0030] Compared with FASC devices with parallel structures and twisted structures, the coaxial FASC device printed by the 3D printing nozzle 100 of the present application has the following advantages:

[0031] First, the compact structure of the coaxial FASC device shortens the transport path of charge carriers (electrons and ions), thereby improving the electrochemical performance.

[0032] Second, the mechanical stability is improved. The coaxial multi-core-shell wrapping structure achieves excellent mechanical stability and maintains a high capacitance retention rate even under repeated bending.

[0033] Third, high energy and power density: Due to the design of the four-layer wrapping structure, the device provides superior area energy / power density under high mass loading, which is very ideal for wearable electronic devices.

[0034] Fourth, close contact between layers: Through 3D printing direct coherent multi-ink writing technology, close contact between electrode layers is achieved, which helps to reduce cracks caused by mismatch of Young's modulus between different layers during extreme or repeated bending.

[0035] Please refer to Figure 1 , Figure 2 and Figure 3 In the 3D printing nozzle 100 of this embodiment, the extension directions of the second infusion channel 1121, the third infusion channel 1131 and the fourth infusion channel 1141 are all inclined relative to the center line 115, so that when the 3D printing nozzle 100 is in use, the printing material output by the outer infusion channel wraps the printing material output by the inner infusion channel, and the inclined angle is set so that the printing material of the outer layer can squeeze the printing material of the inner layer, so that the printing materials between adjacent layers can be closely attached. In addition, the outlet end of the first infusion channel 1111, the outlet end of the second infusion channel 1121, the outlet end of the third infusion channel 1131 and the outlet end of the fourth infusion channel 1141 are all inclined relative to the center line 115, so that when the 3D printing nozzle 100 is in use, the printing material output by the outer infusion channel wraps the printing material output by the inner infusion channel, and the inclined angle is set so that the printing material of the outer layer can squeeze the printing material of the inner layer, so that the printing materials between adjacent layers can be closely attached. The outlet ends of the third infusion channel 1131 and the outlet end of the fourth infusion channel 1141 are arranged in descending order. The printing material is first infused from the first infusion channel 1111. After a period of time, the printing material in the second infusion channel 1121 is then infused, and so on until the printing material in the fourth infusion channel 1141 is infused. The height difference between the infusion channels and the time difference of infusion are beneficial for prolonging the bonding time of the printing materials between adjacent layers. On the other hand, in the initial bonding stage, bonding is carried out from the inside to the outside, which further improves the structural stability of the printed FASC device.

[0036] Please refer to Figure 2 and Figure 5 In one possible implementation, the distance between the outlet end of the first infusion channel 1111 and the outlet end of the second infusion channel 1121 is L1, the distance between the outlet end of the second infusion channel 1121 and the outlet end of the third infusion channel 1131 is L2, and the distance between the outlet end of the third infusion channel 1131 and the outlet end of the fourth infusion channel 1141 is L3, wherein L1, L2, and L3 decrease in sequence. Exemplarily, by gradually reducing the distance between each infusion channel, the flow rate and flow rate of the printed material can be more finely controlled, thereby optimizing the printing process, which helps to ensure that the printed material of each layer is evenly distributed. When the outer layer material wraps the inner layer material, due to the decreasing distance, the extrusion effect of the outer layer material on the inner layer material will gradually increase, which helps to improve the bonding strength between the layers and reduce the risk of separation between the layers, thereby improving the overall mechanical properties of the FASC device. In addition, as the spacing between the infusion channels decreases, more precise material positioning can be achieved.

[0037] Please refer to Figure 2 and Figure 5In one possible implementation, the distance between the outlet end of the first infusion channel 1111 and the outlet end of the second infusion channel 1121 is L1, the distance between the outlet end of the second infusion channel 1121 and the outlet end of the third infusion channel 1131 is L2, and the distance between the outlet end of the third infusion channel 1131 and the outlet end of the fourth infusion channel 1141 is L3, wherein L1, L2, and L3 are equal. Exemplarily, since the distances between the infusion channels are equal, the flow and distribution of the printed material will be more uniform. This helps to ensure that the printed material of each layer has a consistent thickness and density across the entire building platform, thereby improving the overall quality and consistency of the print. When all infusion channels are spaced equally, the design of the nozzle is simpler and the manufacturing process is easier to standardize. This not only helps to reduce manufacturing costs, but may also reduce failures and maintenance problems caused by complex designs. Uniform channel spacing helps to simplify parameter adjustment during printing because different flow or pressure parameters do not need to be set for different channels. When printing objects with symmetrical structures, equal spacing of the infusion channels helps maintain the symmetry of the structure and avoid deformation or internal stress caused by uneven material distribution.

[0038] Please refer to Figure 2 and Figure 5 In a possible implementation, the angles of the extension directions of the second infusion channel 1121, the third infusion channel 1131, and the fourth infusion channel 1141 relative to the center line 115 are all the same angle of the tilt angle α, and the tilt angle α is in the range of [3°, 5°]. For example, in this embodiment, the tilt angle α is set to 4°. Of course, in a specific application, the angle setting of the tilt angle α is not limited thereto. For example, as an alternative, the tilt angle α can also be set to 3°, or 3.5°, or 4.5°, or 5°. In addition, it should be noted that the angle setting of the tilt angle α should not be too large or too small. If the tilt angle α is too large, the outer layer of printed material will cause excessive extrusion on the adjacent inner layer of printed material, which is not conducive to the molding of the FASC device. If the tilt angle α is small, the outer layer of printed material will not cause enough extrusion on the adjacent inner layer of printed material, which will cause the printed materials between adjacent layers to not fit tightly, thereby reducing the structural strength of the FASC device. In addition, the same inclination angle α is conducive to maintaining the consistency of the printed materials output by the second infusion channel 1121 , the third infusion channel 1131 , and the fourth infusion channel 1141 .

[0039] Please refer to Figure 2 and Figure 3In a possible embodiment, the nozzle body 110 further includes a pipeline group 118, which extends from the second end 117 in the direction toward the first end 116, and the pipeline group 118 includes a first pipeline 1181, a second pipeline 1182, a third pipeline 1183, and a fourth pipeline 1184 respectively connected to the first infusion channel 1111, the second infusion channel 1121, the third infusion channel 1131, and the fourth infusion channel 1141. Exemplarily, the first pipeline 1181, the second pipeline 1182, the third pipeline 1183, and the fourth pipeline 1184 are all L-shaped. And the first pipeline 1181, the second pipeline 1182, the third pipeline 1183, and the fourth pipeline 1184 are evenly distributed around the central axis of the main body 119, that is, the angle between adjacent pipelines is 90°.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 In a possible implementation, the nozzle body 110 further includes a main body 119, and the pipeline group 118 is connected to the main body 119. The maximum outer diameter of the main body 119 is D1, and the maximum outer diameter of the pipeline group 118 is D2, wherein D1 / D2≥0.5. Exemplarily, in this embodiment, the ratio of D1 / D2 is 0.5. The ratio of D1 / D2 is limited in order to limit the overall volume of the nozzle body 110, so that the heating sleeve 120 can fully enclose the nozzle body 110, and the distance of the heating sleeve 120 can be close to the infusion channel, so that in the printing space enclosed by the heating sleeve 120, it is more conducive to controlling the temperature in the printing space through the heating sleeve 120, and ensuring the uniformity of the temperature in the printing space.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 In a possible implementation, the aperture of the first infusion channel 1111 gradually decreases in the direction from the first end 116 to the second end 117. Exemplarily, as the aperture of the first infusion channel 1111 gradually decreases, the flow rate and flow rate of the positive electrode material inside the first infusion channel 1111 can be more accurately controlled. As the aperture of the first infusion channel 1111 gradually decreases, the closer to the outlet end of the first infusion channel 1111, the squeezing effect on the positive electrode material in the first infusion channel 1111 will gradually increase, thereby further improving the structural strength of the FASC device.

[0042] Please refer to Figure 2 and Figure 3In a possible embodiment, the nozzle body 110 further includes a first nozzle 111, a second nozzle 112, a third nozzle 113 and a fourth nozzle 114 which are detachably connected in sequence, a first infusion channel 1111 is formed on the first nozzle 111, a second infusion channel 1121 is formed on the second nozzle 112, a third infusion channel 1131 is formed on the third nozzle 113, and a fourth infusion channel 1141 is formed on the fourth nozzle 114. Exemplarily, the first nozzle 111, the second nozzle 112, the third nozzle 113 and the fourth nozzle 114 are assembled and connected by threads. The detachable nozzle design allows each nozzle to be maintained and replaced individually, which greatly improves the maintenance efficiency and reduces the downtime of the entire system caused by the failure of a single nozzle. Users can easily remove defective or clogged nozzles and quickly replace them with new ones to maintain the continuity of printing work. In addition, this design also makes it easy for users to replace nozzles of different specifications according to different printing needs, which improves the flexibility and adaptability of the equipment. The design of detachable nozzles helps to reduce long-term operating costs. When a nozzle is damaged or needs to be upgraded, users do not need to replace the entire nozzle assembly, but only need to replace the damaged nozzle. The detachable nozzle allows users to select the most suitable nozzle type according to the specific printing task, thereby optimizing the print quality. For example, for detailed printing that requires high resolution, a nozzle with a smaller nozzle diameter can be selected; for tasks that require faster printing speeds, a nozzle with a larger flow rate can be selected, or the nozzle can be replaced according to needs to print FASC devices of different thicknesses. This flexibility ensures the best printing results for different printing needs.

[0043] Please refer to Figure 2 and Figure 3In a possible implementation, the 3D printing nozzle 100 further includes a heating collar 120 and a fixing seat 130, the fixing seat 130 is formed with a mounting cavity 131, the nozzle body 110 is fixed in the mounting cavity 131, and the heating collar 120 is arranged in the mounting cavity 131 and nested outside the nozzle body 110. Exemplarily, in this embodiment, the heating collar 120 is in the shape of a circular ring, and the mounting cavity 131 is a rectangular hollow structure. The heating collar 120 is used to output heat, and the heating collar 120 can ensure that the nozzle body 110 is subjected to uniform heat distribution during the printing process. This helps to avoid local overheating or overcooling, thereby ensuring the stability and consistency of the material during the printing process. By uniform heating, the thermal stress of the printing material can be effectively reduced, thereby improving the structural integrity and surface quality of the printed part. The fixing seat 130 provides a stable mounting platform for the nozzle body 110 to ensure that the nozzle does not move or shake during use. The fixing seat 130 can also protect the sensitive components inside the nozzle body 110 from external impact and vibration, thereby improving the durability and service life of the device. In addition, the stable mounting structure reduces the risk of accidental damage and enhances the safety performance of the device.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3 The second object of the present invention is to provide a 3D printing method, which is applied to a 3D printing nozzle 100, and the method includes: when starting the infusion, the order of the start time of the infusion from early to late is the first infusion channel 1111, the second infusion channel 1121, the third infusion channel 1131 and the fourth infusion channel 1141. Exemplarily, at the beginning of printing, the positive electrode material (V2O5 nanowire / multi-walled carbon nanotube) is first output through the first infusion channel 1111, after a first interval, the gel electrolyte wrapped positive electrode material (V2O5 nanowire / multi-walled carbon nanotube) is then output through the second infusion channel 1121, after a second interval, the negative electrode material (VN nanowire / multi-walled carbon nanotube) is then output through the third infusion channel 1131 to wrap the gel electrolyte output from the second infusion channel 1121, after a third interval, the gel electrolyte wrapped negative electrode material (VN nanowire / multi-walled carbon nanotube) is finally output through the fourth infusion channel 1141. It should be noted that in this embodiment, the first time, the second time and the third time are equal. Of course, in another embodiment, the first time, the second time and the third time can be set to be unequal, for example, the first time, the second time and the third time are set to decrease in sequence, or the first time, the second time and the third time are set to increase in sequence. By setting the height difference between the infusion channels and the time difference of infusion, it is beneficial to extend the bonding time of the printed materials between adjacent layers. In the initial bonding stage, bonding is carried out from the inside to the outside, which further improves the structural stability of the printed FASC device.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A 3D printing nozzle, characterized in that: include: The nozzle body comprises a first infusion channel, a second infusion channel, a third infusion channel and a fourth infusion channel which are arranged in sequence from the inside to the outside, the nozzle body having a center line, a first end and a second end, in the direction from the first end to the second end, the outlet end of the first infusion channel, the outlet end of the second infusion channel, the outlet end of the third infusion channel and the outlet end of the fourth infusion channel are distributed in sequence from high to low; the extension directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all arranged obliquely relative to the center line.

2. The 3D printing nozzle according to claim 1, characterized in that The distance between the outlet end of the first infusion channel and the outlet end of the second infusion channel is L1, the distance between the outlet end of the second infusion channel and the outlet end of the third infusion channel is L2, and the distance between the outlet end of the third infusion channel and the outlet end of the fourth infusion channel is L3, wherein L1, L2 and L3 decrease successively.

3. The 3D printing nozzle according to claim 1, characterized in that The distance between the outlet end of the first infusion channel and the outlet end of the second infusion channel is L1, the distance between the outlet end of the second infusion channel and the outlet end of the third infusion channel is L2, and the distance between the outlet end of the third infusion channel and the outlet end of the fourth infusion channel is L3, wherein L1, L2 and L3 are equal.

4. The 3D printing nozzle according to claim 1, characterized in that: The extending directions of the second infusion channel, the third infusion channel and the fourth infusion channel are all inclined at the same angle relative to the center line, and the inclined angle is within the range of [3°, 5°].

5. The 3D printing nozzle according to claim 1, characterized in that: The nozzle body also includes a pipeline group, which extends in the direction from the second end toward the first end, and includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline respectively connected to the first infusion channel, the second infusion channel, the third infusion channel and the fourth infusion channel.

6. The 3D printing nozzle according to claim 5, characterized in that: The nozzle body also includes a main body, and the pipeline group is connected to the main body. Assuming that the maximum outer diameter of the main body is D1, the maximum outer diameter of the pipeline group is D2, wherein D1 / D2≥0.

5.

7. The 3D printing nozzle according to claim 1, characterized in that: In a direction from the first end toward the second end, the aperture of the first infusion channel gradually decreases.

8. The 3D printing nozzle according to claim 1, characterized in that: The nozzle body also includes a first nozzle, a second nozzle, a third nozzle and a fourth nozzle which are detachably connected in sequence, the first infusion channel is formed on the first nozzle, the second infusion channel is formed on the second nozzle, the third infusion channel is formed on the third nozzle, and the fourth infusion channel is formed on the fourth nozzle.

9. The 3D printing nozzle according to claim 1, characterized in that: The 3D printing nozzle also includes a heating sleeve and a fixing seat, wherein the fixing seat is formed with a mounting cavity, the nozzle body is fixed in the mounting cavity, and the heating sleeve is arranged in the mounting cavity and nested outside the nozzle body.

10. A 3D printing method, applied to the 3D printing nozzle, characterized in that: The method includes: when starting infusion, the order of the start time of infusion from earliest to latest is the first infusion channel, the second infusion channel, the third infusion channel and the fourth infusion channel.

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