Spray head structure, spray head suite applying same and 3D printing equipment

Abstract

The utility model provides a spray head structure, a spray head kit applying the spray head structure and 3D printing equipment. The spray head structure is provided with a feeding end and a discharging end which are spaced in the first direction. The spray head structure comprises a first heat conduction piece and a spray nozzle, a first material channel is formed in the first heat conduction piece, and the first material channel is configured to convey consumables entering from the feeding end; the nozzle is connected to the end, close to the discharging end, of the first heat conduction piece, a second material channel is formed in the nozzle, and the first heat conduction piece and the nozzle are sequentially connected in the first direction, so that the second material channel is communicated with the first material channel; the second material channel is configured to convey the consumables entering the second material channel from the first material channel to the discharging end. The nozzle suite comprises an extrusion assembly and a nozzle structure, and the nozzle structure is connected with the extrusion assembly. The 3D printing equipment comprises an equipment main body, a printing platform and a spray head suite, wherein the spray head suite and the printing platform are movably connected with the equipment main body respectively.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and particularly to a nozzle structure, a nozzle kit and a 3D printing device applying the same. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals or plastics and other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling technology is one of the main 3D printing technologies. This technology melts a hot melt filament and extrudes it from a nozzle, depositing it on a forming platform or the previously solidified material of the previous layer to finally generate a physical object. During the 3D printing process, the melting process of the consumable material in the nozzle is very important for the extrusion and printing of the consumable material. The melting process of the consumable material involves many factors such as temperature and flow rate. How to provide a nozzle structure with better performance is what those skilled in the art need to consider. Summary of the Utility Model

[0003] To solve the problems in the prior art, the embodiments of this application provide a nozzle structure, a nozzle kit and a 3D printing device applying the same.

[0004] This application provides a nozzle structure having a feed end and a discharge end spaced along a first direction; the nozzle structure includes a first heat conducting member and a nozzle. A first material channel is provided on the first heat conducting member, and the first material channel is configured to convey the consumable material entering from the feed end; the nozzle is connected to one end of the first heat conducting member close to the discharge end, and a second material channel is provided on the nozzle. The first heat conducting member and the nozzle are sequentially connected along the first direction, so that the second material channel is communicated with the first material channel, and the second material channel is configured to convey the consumable material entering the second material channel from the first material channel to the discharge end.

[0005] It can be understood that by sequentially connecting the first heat conducting member and the nozzle along the first direction, the heating structure can be simultaneously sleeved around the first heat conducting member and the nozzle. Compared with the prior art method of sleeving the first heat conducting member around the nozzle and sleeving the heating structure around the first heat conducting member to set multiple layers of heat conducting media, the heating efficiency of the nozzle structure for the consumable material can be improved.

[0006] In one embodiment, the nozzle structure further includes:

[0007] A heating member having an inner channel;

[0008] Wherein, the first heat conducting member is disposed in the inner channel, and the first heat conducting member is thermally coupled to the heating member for heating the consumable material located in the first material channel. One end of the nozzle connected to the first heat conducting member is at least partially disposed in the inner channel, and the section of the nozzle located in the inner channel is thermally coupled to the heating member for continuously heating the consumable material sent from the first material channel to the second material channel.

[0009] It can be understood that the first heat conducting member is completely accommodated in the heating member and thermally coupled to the heating member, so that the heating member directly heats the consumable material in the first material channel through the first heat conducting member. In addition, at least part of the end of the nozzle connected to the first heat conducting member is accommodated in the heating member and thermally coupled to the heating member, so that the heating member can directly heat the consumable material sent from the first material channel to the second material channel through the nozzle, so as to avoid at least two layers of heat conducting media between the heating member and the consumable material to be heated, which affects the heat transfer efficiency. At the same time, the heating member can not only heat the consumable material in the first material channel, but also continue to heat the consumable material just flowing into the second material channel from the first material channel. Without changing the length of the first heat conducting member, the length of the area in the nozzle structure that can contact the consumable material and then heat the consumable material is increased, so as to ensure that the consumable material can be fully melted.

[0010] In one embodiment, the nozzle includes:

[0011] A heating part, one end of which is connected to the first heat conducting member. The heating part is located in the inner channel, and the heating part is thermally coupled to the heating member, and the heating part is connected to the inner wall of the heating member;

[0012] A nozzle part, connected to the other end of the heating part away from the first heat conducting member, and the nozzle part at least partially extends out of the heating member along the first direction.

[0013] It can be understood that the heating part of the nozzle is located in the inner channel to realize the thermal coupling between the heating part and the heating member, and the heating part located in the inner channel is directly connected to the heating member to realize the connection between the nozzle and the heating member, so that the connection structure between the nozzle and the heating member can be hidden.

[0014] In one embodiment, the extension length of the inner channel along the first direction is greater than or equal to the sum of the extension length of the heating part along the first direction and the extension length of the first heat conducting member along the first direction.

[0015] It can be understood that the heating member completely covers the first heat conducting member and the heating part, so as to increase the area where the consumable material can be heated by the heating member at the same time, and further ensure that the consumable material can be completely melted.

[0016] In one embodiment, the heating part includes:

[0017] The first section, one end of which is connected to the nozzle section, the first section is connected to the inner wall of the heating element and is thermally coupled to the heating element;

[0018] The second section, protruding from the end face of the other end of the first section away from the nozzle section, the second section is detachably connected to the first heat conducting member, at least a part of the second section is located in the first material channel, and the section of the second section located in the first material channel is in contact with the inner wall of the first heat conducting member and is thermally coupled to the first heat conducting member.

[0019] It can be understood that the detachable connection between the second section and the first heat conducting member facilitates the disassembly and replacement of the nozzle and the first heat conducting member respectively. At least a part of the second section of the heating section extends into the first material channel, ensuring that the consumable flowing out of the first material channel directly enters the section of the second material channel at the second section and continues to be heated, realizing continuous heating of the consumable when flowing through the first heat conducting member and the nozzle, and avoiding the situation of sudden change in the heating temperature during the continuous heating of the consumable.

[0020] In one embodiment, a first connection portion is convexly provided on the outer wall of the second section, and one end of the first heat conducting member close to the discharge end abuts against the first connection portion;

[0021] The end face of one end of the first heat conducting member close to the discharge end protrudes towards the discharge end to form a second connection portion;

[0022] Wherein, the first connection portion is clamped with the second connection portion to at least limit the movement of the first heat conducting member in the direction away from the discharge end.

[0023] It can be understood that one end of the first heat conducting member close to the discharge end abuts against the first connection portion, and after the first connection portion is clamped with the second connection portion, the movement of the first heat conducting member in the direction away from the discharge end is limited, thereby realizing the complete limit of the first heat conducting member in its extending direction.

[0024] In one embodiment, the number of the first connection portions is set to at least two, at least two of the first connection portions are arranged at intervals around the axis of the second section, and a receiving space is formed between any two adjacent first connection portions, and the receiving space is configured to accommodate the second connection portion;

[0025] Along the rotation direction of the nozzle, a first clamping protrusion is convexly provided on the side of the first connection portion close to the second connection portion, and a second clamping protrusion is convexly provided on the side of the second connection portion close to the adjacent first clamping protrusion;

[0026] Wherein, along the first direction, the first clamping protrusion and the second clamping protrusion are arranged in a staggered manner, and a clamping groove is formed between the first clamping protrusion and the end face of the first section close to the second section, and the clamping groove is configured to accommodate the second clamping protrusion.

[0027] It can be understood that the arrangement of the first clamping protrusion and the second clamping protrusion enables the second connecting portion to fall into the receiving space under its own gravity by rotating the nozzle, and after further rotating the nozzle, the second clamping protrusion enters the clamping groove, thereby realizing the clamping connection between the first connecting portion and the second connecting portion.

[0028] In an embodiment, along the first direction, one side of the first clamping protrusion close to the second clamping protrusion has a first guiding surface, and the first guiding surface is inclined from the end close to the first connecting portion towards the direction away from the second clamping protrusion to guide the second clamping protrusion into the clamping groove;

[0029] Along the first direction, one side of the second clamping protrusion close to the first clamping protrusion has a second guiding surface, and the second guiding surface is inclined from the end close to the second connecting portion towards the direction away from the first clamping protrusion to cooperate with the first guiding surface to guide the second clamping protrusion into the clamping groove.

[0030] It can be understood that the arrangement of the first guiding surface and the second guiding surface can guide the second clamping protrusion to quickly enter the clamping groove, thereby realizing the quick and accurate clamping connection between the first connecting portion and the second connecting portion.

[0031] In an embodiment, the first connecting portion contacts the inner wall of the heating member and is thermally coupled to the heating member;

[0032] One side of the second connecting portion contacts the outer wall of the second section and is thermally coupled to the second section, and the other side of the second connecting portion contacts the inner wall of the heating member and is thermally coupled to the heating member.

[0033] It can be understood that both the first connecting portion and the second connecting portion are directly or indirectly thermally coupled to the heating member, avoiding the reduction of the area of the first heat conducting member and the heating portion that can heat the consumable due to the arrangement of the first connecting portion and the second connecting portion.

[0034] In an embodiment, the nozzle structure further includes:

[0035] A second heat conducting member, which is arranged in the first heat conducting member and is thermally coupled to the first heat conducting member, and a third material channel is arranged on the second heat conducting member, and the third material channel communicates the first material channel and the second material channel;

[0036] A convex portion is provided on the inner wall of the second heat conducting member, and the convex portion protrudes from a first position on the inner wall of the second heat conducting member towards the central axis direction of the third material channel or a second position on the inner wall of the second heat conducting member.

[0037] It can be understood that the convex portion provided on the second heat conducting member can increase the heat receiving area of the consumable when flowing through the third material channel, ensuring that the consumable can be fully melted. In addition, the convex portion can transfer the heat on the second heat conducting member to the central region of the consumable, so that the inner and outer regions of the consumable can be heated simultaneously, further ensuring that the consumable can be fully melted.

[0038] In one embodiment, the second heat conducting member is detachably connected to the first heat conducting member.

[0039] It can be understood that the detachable connection between the second heat conducting member and the first heat conducting member facilitates the replacement of different second heat conducting members according to different heat receiving requirements of the consumable.

[0040] In one embodiment, the first material channel includes a first section and a second section that are connected in sequence, the cross-sectional area of the first section is larger than that of the second section, so that a first step surface is formed between the first section and the second section, the second heat conducting member is located in the first section, the third material channel communicates with the second section, one end of the second heat conducting member abuts against the first step surface, and the other end abuts against the nozzle.

[0041] It can be understood that the second heat conducting member is clamped between the first step surface and the nozzle, avoiding using other connection structures to position the second heat conducting member.

[0042] In one embodiment, the second heat conducting member is integrally formed and connected to the inner wall of the first heat conducting member.

[0043] It can be understood that the second heat conducting member and the first heat conducting member are integrally formed, avoiding separately assembling the second heat conducting member and improving the assembly efficiency.

[0044] The embodiment of the present application also provides a nozzle kit, including an extrusion assembly, a heat dissipation assembly, and the nozzle structure as described in any one of the foregoing embodiments, and the nozzle structure is connected to the heat dissipation assembly and the extrusion assembly.

[0045] The embodiment of the present application also provides a 3D printing device, including a device main body, a printing platform, and the nozzle structure or nozzle kit as described in any one of the foregoing embodiments, and the nozzle structure and the printing platform are respectively movably connected to the device main body. Description of the Drawings

[0046] Figure 1 It is a three-dimensional schematic diagram of the nozzle structure of the present application in one embodiment.

[0047] Figure 2 is Figure 1 The explosion schematic diagram of the nozzle structure in one embodiment in

[0048] Figure 3 is Figure 1 The structural schematic diagram of the nozzle of the nozzle structure in one embodiment in

[0049] Figure 4 is Figure 2 The partial enlarged schematic diagram of the corresponding area A of the nozzle structure in

[0050] Figure 5 The sectional schematic diagram of the nozzle structure of the present application in one embodiment.

[0051] Figure 6 The structural schematic diagram of the first connection part and the second connection part of the nozzle structure of the present application in one embodiment.

[0052] Figure 7 The structural schematic diagram of the first connection part and the second connection part of the nozzle structure of the present application in another perspective in one embodiment.

[0053] Figure 8 The connection schematic diagram of the second heat conducting part and the first heat conducting part of the nozzle structure of the present application in one embodiment.

[0054] Figure 9 The sectional schematic diagram of the second heat conducting part of the nozzle structure of the present application in one embodiment.

[0055] Figure 10 The sectional schematic diagram of the second heat conducting part of the nozzle structure of the present application in another embodiment.

[0056] Figure 11 The sectional schematic diagram of the second heat conducting part of the nozzle structure of the present application in another embodiment.

[0057] Figure 12 The three-dimensional schematic diagram of the nozzle structure of the present application installed with a feeding pipe in one embodiment.

[0058] Figure 13 is Figure 12 The sectional schematic diagram of the nozzle structure in one embodiment in

[0059] Figure 14 The three-dimensional schematic diagram of the nozzle kit of the present application in one embodiment.

[0060] Figure 15 The three-dimensional schematic diagram of the 3D printing device of the present application in one embodiment.

[0061] Main element symbol description:

[0062] Sprinkler structure 10

[0063] Feeding end 101

[0064] Discharging end 102

[0065] Receiving space 103

[0066] Heating element 11

[0067] Inner channel 110

[0068] First heating section 111

[0069] Second external thread 1110

[0070] Second heating section 112

[0071] Third heating section 113

[0072] Detection hole 1130

[0073] First heat conducting part 12

[0074] First material channel 120

[0075] Third section 1203

[0076] Second section 1202

[0077] First section 1201

[0078] Second connecting part 122

[0079] Second clamping protrusion 1220

[0080] Nozzle 13

[0081] Second material channel 130

[0082] Nozzle part 131

[0083] Heating part 132

[0084] First zone part 1321

[0085] First external thread 13210

[0086] Second zone part 1322

[0087] First connecting part 1323

[0088] First clamping protrusion 13231

[0089] Clamping groove 13232

[0090] Second heat conducting part 14

[0091] Third material path 140

[0092] Convex part 141

[0093] Feeding pipe 15

[0094] Connecting seat 16

[0095] Perforation 161

[0096] Extrusion assembly 17

[0097] Heat dissipation assembly 18

[0098] Device main body 191

[0099] Printing platform 192

[0100] First direction Z

[0101] Rotation direction R

[0102] First step surface P1

[0103] Second step surface P2

[0104] First guiding surface P3

[0105] Second guiding surface P4

[0106] First surface P5

[0107] Second surface P6

[0108] Nozzle kit 2

[0109] 3D printing device 3

[0110] The following specific embodiments will further illustrate the present application in combination with the above-mentioned drawings. Specific embodiments

[0111] The following description will describe the content of the present application more comprehensively with reference to the drawings. The exemplary embodiments shown in the drawings are those of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0112] The terms used herein are for the purpose of describing particular exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. Further, when used herein, "comprising" and / or "including" and / or "having", integers, steps, operations, components and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0113] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Further, unless explicitly defined herein, terms such as those defined in a general dictionary should be construed to have a meaning consistent with their meaning in the relevant art and the content of this application, and will not be construed as idealized or overly formal meanings. Further, unless explicitly defined herein, terms such as those defined in a general dictionary should be construed to have a meaning consistent with their meaning in the relevant art and the content of this application, and will not be construed as idealized or overly formal meanings. The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0114] Generally, 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals or plastics and other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling technology is one of the main 3D printing technologies. This technology melts the hot melt filament and extrudes it from the nozzle, depositing it on the forming platform or the previously cured material of the previous layer, and finally generating a physical object. In the 3D printing process, the melting process of the consumable in the nozzle is very important for the extrusion and printing of the consumable, and the melting process of the consumable involves many factors such as temperature and flow rate. How to provide a nozzle structure with better performance is something that those skilled in the art need to consider.

[0115] Therefore, the present application provides a nozzle structure and a nozzle kit and a 3D printing device applying the same. The nozzle structure has a feed end and a discharge end spaced along a first direction; the nozzle structure includes a first heat conducting member and a nozzle, a first material passage is provided on the first heat conducting member, and the first material passage is configured to convey a consumable entering from the feed end; the nozzle is connected to one end of the first heat conducting member close to the discharge end, a second material passage is provided on the nozzle, the first heat conducting member and the nozzle are sequentially connected along the first direction, so that the second material passage is communicated with the first material passage, and the second material passage is configured to convey the consumable entering the second material passage from the first material passage to the discharge end.

[0116] Among them, in the nozzle structure of the present application, the first heat conducting member and the nozzle are sequentially connected in the first direction, and the heating structure can be sleeved around the first heat conducting member and the nozzle at the same time. Compared with the prior art in which the first heat conducting member is sleeved around the nozzle and the heating structure is sleeved around the first heat conducting member to provide a multi-layer heat conducting medium, the heating efficiency of the nozzle structure for the consumable can be improved.

[0117] Those skilled in the art can understand that a "3D printing device" refers to a device capable of implementing 3D printing (additive manufacturing).

[0118] Those skilled in the art can understand that "thermal coupling" refers to heat transfer connection, which can be achieved by heat conduction, heat convection, heat radiation, or any combination of the above three methods.

[0119] Those skilled in the art can understand that a "consumable" refers to a rod-shaped thermoplastic material in a solid state at room temperature, which can be melted by heat and then cooled to form a shape.

[0120] The following will further describe in detail the specific embodiments of the present application with reference to the accompanying drawings.

[0121] As Figures 1 to 5 shown, this embodiment provides a nozzle structure 10 having a feed end 101 and a discharge end 102 spaced apart along a first direction Z. The nozzle structure 10 includes a first heat conducting member 12, a nozzle 13, and a heating member 11. The first heat conducting member 12 and the nozzle 13 are integrally provided along the first direction Z, and the heating member 11 is sleeved around the first heat conducting member 12 and the nozzle 13.

[0122] In one embodiment, a first material channel 120 is provided on the first heat conducting member 12, and the first material channel 120 is configured to convey the consumable entering from the feed end 101. The extending direction of the first material channel 120 is parallel to the first direction Z, and the first material channel 120 extends in the first direction Z to penetrate the first heat conducting member 12. The first direction Z is the direction of the central axis of the nozzle structure 10. One end of the first material channel 120 communicates with the feed end 101 to receive the consumable entering from the feed end 101. The nozzle 13 is connected to one end of the first heat conducting member 12 close to the discharge end 102. A second material channel 130 is provided on the nozzle 13, and the extending direction of the second material channel 130 is parallel to the first direction Z and penetrates the nozzle 13. The first heat conducting member 12 and the nozzle 13 are sequentially connected along the said one direction, one end of the second material channel 130 communicates with the end of the first material channel 120 far from the feed end 101, and the other end of the second material channel 130 communicates with the discharge end 102 to convey the consumable entering the second material channel 130 from the first material channel 120 to the discharge end 102.

[0123] It can be understood that the first heat conducting member 12 is completely received within the heating member 11 and is thermally coupled to the heating member 11, enabling the heating member 11 to directly heat the consumable material within the first material channel 120 through the first heat conducting member 12. In addition, one end of the nozzle 13 connected to the first heat conducting member 12 is at least partially received within the heating member 11 and is thermally coupled to the heating member 11, enabling the heating member 11 to directly heat the consumable material sent from the first material channel 120 to the second material channel 130 through the nozzle 13, so as to avoid at least two layers of heat conducting media between the heating member 11 and the consumable material to be heated, which may affect the heat transfer efficiency. At the same time, the heating member 11 can not only heat the consumable material within the first material channel 120, but also continue to heat the consumable material that has just flowed into the second material channel 130 from the first material channel 120. Without changing the length of the first heat conducting member 12, the length of the area within the nozzle structure 10 that can come into contact with the consumable material and then heat the consumable material is increased, thereby ensuring that the consumable material can be fully melted to be suitable for high-speed printing.

[0124] In this embodiment, the feeding end 101 and the discharging end 102 are two spaced-apart ends of the nozzle structure 10. After the consumable material is extruded, it enters the nozzle structure 10 from the feeding end 101, and after being guided and heated by the nozzle structure 10, the consumable material is sent out of the nozzle structure 10 from the discharging end 102. In other embodiments, the feeding end 101 and the discharging end 102 are used to indicate two different positions of the nozzle structure 10. Among them, the nozzle structure 10 is provided with a feeding port and a discharging port. The consumable material enters the nozzle structure 10 from the feeding port and is sent out of the nozzle structure 10 from the discharging port. The feeding end 101 points to the orientation of the feeding port relative to the nozzle structure 10, and the discharging end 102 points to the orientation of the discharging port relative to the nozzle structure 10.

[0125] In one embodiment, the heating member 11 is provided with an inner channel 110, and the inner channel 110 extends along the first direction Z and penetrates through the heating member 11. Among them, the first heat conducting member 12 is disposed within the inner channel 110, and the first heat conducting member 12 is thermally coupled to the heating member 11 for heating the consumable material located within the first material channel 120. One end of the nozzle 13 connected to the first heat conducting member 12 is at least partially disposed within the inner channel 110, and the section of the nozzle 13 located within the inner channel 110 is thermally coupled to the heating member 11 for continuously heating the consumable material sent from the first material channel 120 to the second material channel 130.

[0126] It should be explained that from the perspective of the dynamic movement process of the consumable material, the above-mentioned "continuous heating" means that when the consumable material heated within the first material channel 120 is just sent to the second material channel 130, it will immediately be heated by the section of the nozzle 13 that is thermally coupled to the heating member 11, so as to ensure that the consumable material is in a continuously heated state during the process from entering the first material channel 120 to a certain position when being sent from the first material channel 120 to the second material channel 130.

[0127] In addition, from the perspective of the consumable being in a static state, that is, at a certain moment when both the first material channel 120 and the second material channel 130 are filled with the consumable, a part of the continuous consumable is intercepted for description. A part of the intercepted consumable is located in the first material channel 120, and the remaining part is located in the heatable area of the second material channel 130. Among them, the consumable in the part located in the first material channel 120 is heated by the heating element 11 through the first heat conducting member 12, and the consumable in the part located in the second material channel 130 is heated by the heating element 11 through the nozzle 13, so as to realize the simultaneous heating of the intercepted consumable at this moment in two different components, namely the first heat conducting member 12 and the nozzle 13, and in a sense, realize the "integrated heating" of the continuous consumable in two different components.

[0128] Further in combination with Figures 2 to 5 , in this embodiment, the nozzle 13 is generally a hollow columnar structure, and includes a heating part 132 and a nozzle part 131 connected to each other. The second material channel 130 sequentially penetrates through the heating part 132 and the nozzle part 131. Among them, one end of the heating part 132 is connected to the first heat conducting member 12, and the nozzle part 131 is connected to the end of the heating part 132 far from the first heat conducting member 12. At least a part of the end of the nozzle part 131 close to the heating part 132 is located in the heating element 11 and is thermally coupled with the heating element 11, so that the consumable will continue to be heated when entering the nozzle part 131 from the heating part 132, ensuring the continuity of the heat received by the consumable. The end of the nozzle part 131 far from the heating part 132 extends out of the heating element 11 along the first direction Z. The connection manner between the nozzle part 131 and the heating part 132 includes but is not limited to being integrally formed.

[0129] In an embodiment, the section of the second material channel 130 at the heating part 132 communicates with the first material channel 120, so that the consumable in the first material channel 120 can be sent into the heating part 132 for heating. The heating part 132 is located in the inner channel 110, and the heating part 132 is in contact with the inner wall of the heating element 11, so that the heating part 132 is thermally coupled with the heating element 11, and the heating element 11 transfers heat to the heating part 132, and then the consumable in the heating part 132 is heated to be melted.

[0130] In this embodiment, the heating element 11 is generally a hollow cylindrical structure, and the heating part 132 is connected to the inner wall of the heating element 11. The outer peripheral surface of the heating part 132 is provided with a first external thread 13210, and the inner peripheral surface of the heating element 11 is provided with a first internal thread (not shown in the figure). The first external thread 13210 is in threaded connection with the first internal thread to realize the detachable connection between the heating part 132 and the heating element 11.

[0131] It can be understood that the heating part 132 of the nozzle 13 is located inside the inner channel 110 to achieve thermal coupling between the heating part 132 and the heating element 11. The heating part 132 located inside the inner channel 110 is directly connected to the heating element 11 to connect the nozzle 13 and the heating element 11, and the connection structure between the nozzle 13 and the heating element 11 can be hidden.

[0132] In one embodiment, the extension length of the inner channel 110 is greater than or equal to the sum of the extension lengths of the heating part 132 and the first heat conducting member 12. Thus, when the first heat conducting member 12 is connected to the heating part 132, the heating element 11 can completely cover the first heat conducting member 12 and the heating part 132, increasing the contact area between the first heat conducting member 12 and the heating part 132 and the heating element 11, and further increasing the area of the consumable that can be heated simultaneously to ensure that the consumable can be completely melted.

[0133] Further combined Figures 2 to 5 , in one embodiment, the heating part 132 includes a first section 1321 and a second section 1322 integrally formed and connected. The second material channel 130 sequentially penetrates through the first section 1321 and the second section 1322. Both the first section 1321 and the second section 1322 are cylindrical structures, the first section 1321 and the second section 1322 are coaxially arranged, and the directions of their central axes are both parallel to the first direction Z.

[0134] Among them, one end of the first section 1321 is connected to the end face of the nozzle part 131 away from the discharge end 102, and the first section 1321 is connected to the inner wall of the heating element 11. The first section 1321 contacts the inner wall of the heating element 11 to enable thermal coupling between the first section 1321 and the heating element 11. After the heating element 11 transfers heat to the first section 1321, the consumable inside the first section 1321 is heated.

[0135] In this embodiment, a first external thread 13210 is provided on the outer surface of the first section 1321 to enable the first section 1321 to be threadedly connected to the inner wall of the heating element 11. Along the first direction Z, the extension length of the first external thread 13210 is less than the extension length of the first section 1321, and the end of the first section 1321 away from the first heat conducting member 12 is exposed outside the heating element 11, so that the second section 1322 and the heating element 11 are spaced apart in the first direction Z to prevent the heating element 11 from directly contacting the second section 1322.

[0136] Among them, the second section 1322 protrudes from the end face of the first section 1321 away from the nozzle section 131. The second section 1322 is detachably connected to the first heat conducting member 12, facilitating the disassembly and replacement of the nozzle 13 and the first heat conducting member 12 respectively. At least a part of the second section 1322 is located within the first material channel 120. The section of the second section 1322 located within the first material channel 120 contacts the inner wall of the first heat conducting member 12 and is thermally coupled to the first heat conducting member 12, so that the first heat conducting member 12 transfers heat to a partial section of the second section 1322 extending into the first heat conducting member 12, preventing the structure of this partial second section 1322 from being unable to contact the heating member 11 and thus unable to heat the consumable material therein.

[0137] It can be understood that at least a part of the second section 1322 of the heating section 132 extends into the first material channel 120, ensuring that the consumable material flowing out of the first material channel 120 directly enters the section of the second material channel 130 at the second section 1322 and continues to be heated, realizing continuous heating of the consumable material when flowing through the first heat conducting member 12 and the nozzle 13, and preventing the situation of sudden change in the heating temperature of the consumable material during continuous heating.

[0138] In other embodiments, the second section 1322 may not extend into the first heat conducting member 12 either. The end face of the second section 1322 away from the first section 1321 abuts against the end face of the first heat conducting member 12 away from the feeding end 101, and it is ensured that the consumable material in the first material channel 120 can directly enter the second material channel 130. At the same time, the second section 1322 is in direct contact with and thermally coupled to the inner wall of the heating member 11, and then the heating member 11 directly heats the second section 1322.

[0139] In this embodiment, a first connecting portion 1323 protrudes from the outer wall of the second section 1322. The number of the first connecting portions 1323 is set to be at least two. The at least two first connecting portions 1323 are arranged at equal intervals around the axis of the second section 1322, and a receiving space 103 is formed between any two adjacent first connecting portions 1323. One end of the first heat conducting member 12 close to the discharging end 102 abuts against the first connecting portion 1323. The end face of one end of the first heat conducting member 12 close to the discharging end 102 protrudes towards the discharging end 102 to form a second connecting portion 122. Among them, the first connecting portion 1323 is snap-connected to the second connecting portion 122 to at least limit the movement of the first heat conducting member 12 in the direction away from the discharging end 102. The number of the second connecting portions 122 is the same as that of the first connecting portions 1323, and one second connecting portion 122 is accommodated in the receiving space 103 formed between any two adjacent first connecting portions 1323.

[0140] It can be understood that one end of the first heat conducting member 12 close to the discharge end 102 abuts against the first connecting portion 1323, and after the first connecting portion 1323 is clamped with the second connecting portion 122, the movement of the first heat conducting member 12 away from the discharge end 102 is restricted, thereby realizing the complete limit of the first heat conducting member 12 in its extending direction.

[0141] Specifically, the shape of the first connecting portion 1323 is arc-shaped, the first connecting portion 1323 surrounds the outer peripheral surface of the second region portion 1322 and fits with the outer peripheral surface of the second region portion 1322. Along the first direction Z, one end of the first connecting portion 1323 away from the first heat conducting member 12 is connected to the end surface of one end of the first region portion 1321 close to the second region portion 1322. The first connecting portion 1323 can be integrally formed with the first region portion 1321 and the second region portion 1322.

[0142] Particularly, along the first direction Z, the extending length of the first connecting portion 1323 is less than the extending length of the second region portion 1322, so that the region of the second region portion 1322 covered by the first connecting portion 1323 is exposed outside the first heat conducting member 12, while the region of the second region portion 1322 not covered by the first connecting portion 1323 extends into the first heat conducting member 12.

[0143] In this embodiment, the number of the first connecting portions 1323 is two, and the two first connecting portions 1323 are symmetrically arranged about the axis of the second region portion 1322. Correspondingly, the number of the second connecting portions 122 is two, the shapes of the two second connecting portions 122 are both arc-shaped, and the two second connecting portions 122 are symmetrically arranged about the axis of the first heat conducting member 12.

[0144] It can be understood that in other embodiments, the number of the first connecting portion 1323 and the second connecting portion 122 can also be three, four or other numbers.

[0145] Along the rotation direction R of the nozzle 13, a first clamping protrusion 13231 protrudes from the end surface of one end of any one first connecting portion 1323 close to the other first connecting portion 1323. The first clamping protrusion 13231 is spaced from the end surface of one end of the first region portion 1321 close to the second region portion 1322, and a clamping groove 13232 is formed therebetween.

[0146] Along the direction opposite to the rotation direction R of the nozzle 13, an end face of one second connecting portion 122 near one end close to the other second connecting portion 122 is convexly provided with a second clamping protrusion 1220. The second clamping protrusion 1220 and the first clamping protrusion 13231 are arranged in a dislocation manner in the first direction Z. The second clamping protrusion 1220 is received in the clamping groove 13232. When the second clamping protrusion 1220 is received in the clamping groove 13232, the first clamping protrusion 13231 abuts against the second clamping protrusion 1220 to limit the movement of the first clamping protrusion 13231 in the first direction Z towards the feeding end 101.

[0147] Particularly, along the rotation direction R of the nozzle 13, the distance between the adjacent ends of the two first connecting portions 1323 is greater than the extension length of the second connecting portion 122 to leave a rotation space for the first heat conducting member 12 in the rotation direction R of the nozzle 13. When it is necessary to fix the nozzle 13 to the first heat conducting member 12, rotate the nozzle 13 along the rotation direction R so that the second connecting portion 122 is approximately located between the two first connecting portions 1323, and the first heat conducting member 12 falls into the receiving space 103 under its own gravity. Subsequently, continue to rotate the nozzle 13 until the second clamping protrusion 1220 enters the clamping groove 13232, so that the second clamping protrusion 1220 is clamped with the first clamping protrusion 13231. When it is necessary to disassemble the nozzle 13 from the first heat conducting member 12, rotate the nozzle 13 along the direction opposite to the rotation direction R until the second clamping protrusion 1220 disengages from the clamping groove 13232, and then the first heat conducting member 12 can be moved relative to the nozzle 13 in the first direction Z to separate the two.

[0148] Further combined with Figure 6 and Figure 7 In this embodiment, along the first direction Z, one side of the first clamping protrusion 13231 close to the second clamping protrusion 1220 has a first guiding surface P3. The first guiding surface P3 is inclined from its end close to the first connecting portion 1323 towards the direction away from the second clamping protrusion 1220 to guide the second clamping protrusion 1220 into the clamping groove 13232.

[0149] Along the first direction Z, one side of the second clamping protrusion 1220 close to the first clamping protrusion 13231 has a second guiding surface P4. The second guiding surface P4 is inclined from its end close to the second connecting portion 122 towards the direction away from the first clamping protrusion 13231 to cooperate with the first guiding surface P3 to guide the second clamping protrusion 1220 into the clamping groove 13232.

[0150] The first guiding surface P3 and the second guiding surface P4 can be a plane or a curved surface. When the second clamping protrusion 1220 enters the clamping groove 13232, the second guiding surface P4 abuts against the first guiding surface P3 and enters the clamping groove 13232 along the extension path of the first guiding surface P3.

[0151] Thus, both the first guiding surface P3 and the second guiding surface P4 are inclined, and their inclined states are the same. When the rotary nozzle 13 fixes the nozzle 13 to the first heat conducting member 12, the inclined first guiding surface P3 and the second guiding surface P4 can enable the second connecting portion 122 to slide down along the first connecting portion 1323 into the receiving space 103 more easily under the gravity of the first heat conducting member 12, and the second connecting portion 122 will be guided by the inclined first guiding surface P3 to deviate slightly toward one side of the clamping groove 13232 during the sliding process, facilitating the subsequent continuous rotation of the nozzle 13 to accurately and quickly insert the second clamping protrusion 1220 into the clamping groove 13232. In addition, when further rotating the nozzle 13 to clamp the second clamping protrusion 1220 with the first clamping protrusion 13231, since the first connecting portion 1323 and the second connecting portion 122 are located inside the heating member 11 and the relative positions of the second clamping protrusion 1220 and the first clamping protrusion 13231 cannot be directly observed, the inclined first guiding surface P3 and the second guiding surface P4 can guide the second clamping protrusion 1220 to accurately and quickly enter the clamping groove 13232, avoiding interference problems caused by incorrect relative positions of the second clamping protrusion 1220 and the first clamping protrusion 13231 and affecting the connection stability between the nozzle 13 and the first heat conducting member 12.

[0152] Particularly, the end face of the first clamping protrusion 13231 far from the first connecting portion 1323 is set as the first surface P5. The first guiding surface P3 is in transitional connection with the first surface P5. For example, the connection between the first guiding surface P3 and the first surface P5 is in a curve transition, so that during the process of the second connecting portion 122 sliding down into the receiving space 103, the second connecting portion 122 can deviate slightly toward one side of the clamping groove 13232 along the first surface P5, facilitating the subsequent continuous rotation of the nozzle 13 to accurately and quickly insert the second clamping protrusion 1220 into the clamping groove 13232.

[0153] Correspondingly, the end face of the second clamping protrusion 1220 far from the second connecting portion 122 is set as the second surface P6. The second guiding surface P4 is in transitional connection with the second surface P6. For example, the connection between the second guiding surface P4 and the second surface P6 is in a curve transition.

[0154] In this embodiment, the first connecting portion 1323 contacts the inner wall of the heating member 11 and is thermally coupled to the heating member 11. Thus, the heating member 11 transfers heat to the first connecting portion 1323, and the first connecting portion 1323 is integrally formed with the second region portion 1322. Thus, the heat received by the first connecting portion 1323 is further transferred to the second region portion 1322 in contact therewith.

[0155] One side of the second connecting part 122 contacts the outer wall of the second zone part 1322 and is thermally coupled to the second zone part 1322. The other side of the second connecting part 122 contacts the inner wall of the heating element 11 and is thermally coupled to the heating element 11. Then, the heating element 11 transfers heat to the second zone part 1322 through the second connecting part 122.

[0156] It should be noted that, in order to improve the heating effect of the second zone part 1322 on the consumable, when the first connecting part 1323 and the second connecting part 122 are clamped, the first connecting part 1323 and the second connecting part 122 preferably cover as much of the outer peripheral surface of the second zone part 1322 as possible, thereby increasing the contact area between the second zone part 1322 and the first connecting part 1323 and the second connecting part 122.

[0157] It can be understood that both the first connecting part 1323 and the second connecting part 122 are directly or indirectly thermally coupled to the heating element 11, so as to avoid reducing the area of the zone where the first heat conducting part 12 and the heating part 132 can heat the consumable due to the provision of the first connecting part 1323 and the second connecting part 122.

[0158] In one embodiment, the heating part 132, the first connecting part 1323, the first heat conducting part 12, and the second connecting part 122 are made of the same heat conducting material or materials with similar heat conducting properties, so as to ensure that the heating conditions of the consumable in the first material channel 120 and the second material channel 130 can be kept relatively close.

[0159] Further in combination with Figures 8 to 9 and referring to Figure 5 In this embodiment, the nozzle structure 10 further includes a second heat conducting part 14. The second heat conducting part 14 is disposed inside the first heat conducting part 12 and is thermally coupled to the first heat conducting part 12. A third material channel 140 is provided on the second heat conducting part 14, and the third material channel 140 communicates with the first material channel 120 and the second material channel 130.

[0160] The second heat conducting part 14 has a hollow cylindrical structure to be adapted to the first heat conducting part 12. The second heat conducting part 14 is received inside the first heat conducting part 12 along the first direction Z, and the outer peripheral surface of the second heat conducting part 14 contacts the inner peripheral surface of the first heat conducting part 12, so that the heating element 11 can transfer heat to the second heat conducting part 14 through the first heat conducting part 12, and then heat the consumable inside the second heat conducting part 14.

[0161] Specifically, a convex portion 141 is provided on the inner wall of the second heat conducting member 14. The convex portion 141 protrudes from a first position on the inner wall of the second heat conducting member 14 towards the central axis direction of the third material channel 140 or a second position on the inner wall of the second heat conducting member 14. The convex portion 141 is integrally formed with the second heat conducting member 14, and the convex portion 141 is made of the same material as the second heat conducting member 14. When the consumable is in the third material channel 140, it will contact the outer surface of the convex portion 141, thereby increasing the heat receiving area of the consumable. Among them, the first position and the second position only represent two different positions on the inner wall of the second heat conducting member 14.

[0162] It can be understood that the convex portion 141 provided on the second heat conducting member 14 can increase the heat receiving area of the consumable when flowing through the third material channel 140, ensuring that the consumable can be fully melted. In addition, the convex portion 141 can transfer the heat on the second heat conducting member 14 to the central area of the consumable, so that the inner and outer areas of the consumable can be heated simultaneously, further ensuring that the consumable can be fully melted. Moreover, the setting of multiple convex portions 141 can increase the flow rate of the consumable in the third material channel 140 to be suitable for high-speed printing.

[0163] In one embodiment, along the first direction Z, the bottom end of the convex portion 141 extends to be coplanar with the bottom end surface of the second heat conducting member 14, and the top end surface of the convex portion 141 is spaced from the top end surface of the second heat conducting member 14. It can be understood that along the first direction Z, the bottom end of the convex portion 141 can also extend to not exceed the bottom end surface of the second heat conducting member 14, and the top end of the convex portion 141 extends to be coplanar with the top end surface of the second heat conducting member 14.

[0164] In one embodiment, the number of the convex portions 141 is one or more. The specific number of the multiple convex portions 141 is four, six, eight, etc. The multiple convex portions 141 are arranged in sequence around the first direction Z. The shape of the convex portion 141 can be a regular shape such as a strip shape, a column shape, a spherical shape, etc., or an irregular shape.

[0165] In this embodiment, specifically as Figure 9 , multiple convex portions 141 all protrude from the inner wall of the second heat conducting member 14 towards the central axis direction of the third material channel 140, and one ends of the multiple convex portions 141 away from the inner wall of the second heat conducting member 14 are spaced from each other, so that the cross-section of the third material channel 140 is still a single hole.

[0166] In other embodiments, specifically as Figure 10 , multiple convex portions 141 all protrude from the inner wall of the second heat conducting member 14 towards the central axis direction of the third material channel 140, and one ends of the multiple convex portions 141 away from the inner wall of the second heat conducting member 14 are connected to each other, so that the cross-section of the third material channel 140 is divided into multiple independent and non-connected holes.

[0167] In other embodiments, specifically as Figure 11, a plurality of convex portions 141 all protrude from a first position on the inner wall of the second heat conducting member 14 towards a second position on the inner wall of the second heat conducting member 14 and are connected to the inner wall of the second heat conducting member 14, so that the cross-section of the third material channel 140 is divided into a plurality of independently existing and non-communicating holes.

[0168] Further combined Figure 5 , in this embodiment, the second heat conducting member 14 is detachably connected to the first heat conducting member 12, which is convenient for replacing the second heat conducting member 14 with different shapes or numbers of convex portions 141 according to the different heat requirements of the consumables. In addition, when one of the second heat conducting member 14 and the first heat conducting member 12 needs to be replaced or maintained, it can be separately removed for maintenance or replacement.

[0169] The first material channel 120 includes a first section 1201 and a second section 1202 that are sequentially communicated. The first section 1201 is located on the side of the second section 1202 close to the discharge end 102. The cross-sectional area of the first section 1201 is larger than the cross-sectional area of the second section 1202, so that a first step surface P is formed between the first section 1201 and the second section 1202. The second heat conducting member 14 is located in the first section 1201. One end of the third material channel 140 communicates with the second section 1202, so that the consumables in the second section 1202 can directly flow into the third material channel 140. The other end of the third material channel 140 communicates with the second material channel 130 to send the consumables in the third material channel 140 into the second material channel 130. One end of the second heat conducting member 14 abuts against the first step surface P, and the other end abuts against the second section 1322 of the nozzle 13, so that the second heat conducting member 14 is clamped between the first step surface P and the nozzle 13, avoiding using other connection structures to position the second heat conducting member 14.

[0170] In an embodiment, the first material channel 120 further includes a third section 1203. The third section 1203 communicates with one end of the second section 1202 away from the first section 1201, and the consumables enter the third section 1203 from the feed end 101. The cross-sectional area of the third section 1203 is larger than the cross-sectional area of the second section 1202, so that a second step surface P is formed between the third section 1203 and the second section 1202. The third section 1203 is used to accommodate a feeding tube 15, and the feeding tube 15 is a Teflon tube or the like. One end of the feeding tube 15 is accommodated in the third section 1203 and communicates with the third section 1203, and the other end of the feeding tube 15 receives the consumables to send the consumables into the first material channel 120 through the feeding tube 15. In addition, the feeding tube 15 abuts against the second step surface P, thereby limiting the feeding tube 15 and ensuring its stability when transmitting the consumables.

[0171] In another embodiment, the second heat conducting member 14 is integrally formed and connected to the inner wall of the first heat conducting member 12. The second heat conducting member 14 and the first heat conducting member 12 are integrally formed, which can avoid separately assembling the second heat conducting member 14 and improve the assembly efficiency.

[0172] Further combining Figure 12 and Figure 13 and referring to Figure 5 in this embodiment, the heating member 11 is generally a hollow cylindrical structure, and the heating member 11 can provide heat by using a ceramic heating ring or embedding a resistance wire.

[0173] Along the first direction Z, the heating member 11 includes a first heating section 111, a second heating section 112, and a third heating section 113 that are sequentially connected. The first heating section 111 is located on the side of the second heating section 112 close to the feeding end 101, and the third heating section 113 is located on the side of the second heating section 112 close to the discharging end 102.

[0174] The inner surface of the third heating section 113 is provided with a first internal thread, and the first section 1321 is threadedly connected inside the third heating section 113. The outer diameter of the third heating section 113 is larger than that of the second heating section 112, so that the third heating section 113 can increase the heat transfer effect by increasing the volume of its heat conducting medium, and avoid the reduction of the heat transfer efficiency of the third heating section 113 to the consumables in the first section 1321 due to the reduction of the contact area between the first section 1321 and the third heating section 113 caused by the threaded structure provided therebetween.

[0175] In addition, at least a part of one end of the nozzle portion 131 close to the first section 1321 is located inside the third heating section 113 and is thermally coupled to the third heating section 113, so that the consumables entering the nozzle portion 131 from the first section 1321 can be continuously heated by the third heating section 113 for a period of time.

[0176] Particularly, a detection hole 1130 is provided on the third heating section 113, and the detection hole 1130 is used to install a temperature sensor (not shown in the figure), and the temperature sensor is used to detect the temperature of the nozzle structure 10.

[0177] The first heat conducting member 12 is completely received in the second heating section 112 and the first heating section 111, and the second section 1322 extends into the first heat conducting member 12 located in the second heating section 112.

[0178] The outer diameter of the first heating section 111 is smaller than that of the second heating section 112, and a second external thread 1110 is provided on the outer peripheral surface of the first heating section 111. The nozzle structure 10 further includes a connection base 16. The connection base 16 is provided with a through hole 161, and the first heating section 111 is received in the through hole 161. A second internal thread (not shown in the figure) is provided on the inner surface of the through hole 161, and the second internal thread is threadedly connected to the second external thread 1110 to achieve detachable connection between the connection base 16 and the first heating section 111. The connection base 16 is used to connect to other components to mount the nozzle structure 10 on other devices.

[0179] As Figure 14 shown, and in combination with Figure 12 and Figure 13 , an embodiment of the present application further provides a nozzle kit 2, including an extrusion assembly 17, a heat dissipation assembly 18, and the nozzle structure 10 as described in any one of the foregoing embodiments. The nozzle structure 10 is connected to the heat dissipation assembly 18 and the extrusion assembly 17. The extrusion assembly 17 can extrude the consumable and then transport it to the nozzle structure 10, and the heat dissipation assembly 18 can dissipate heat from the nozzle structure 10.

[0180] The extrusion assembly 17 is communicated with the first material channel 120 through the above-mentioned feeding pipe 15 to send the consumable into the first material channel 120. In addition, the extrusion assembly 17 can be mounted to the nozzle structure 10 through the above-mentioned connection base 16.

[0181] It can be understood that the nozzle kit 2 of the present application has a nozzle structure 10 that can fully melt the consumable, so that it can be applicable to high-speed printing.

[0182] As Figure 15 shown, and in combination with Figure 14 , an embodiment of the present application further provides a 3D printing device 3, including a device main body 191, a printing platform 192, and the nozzle structure 10 or the nozzle kit 2 as described in any one of the foregoing embodiments. The nozzle structure 10 and the printing platform 192 are respectively movably connected to the device main body 191.

[0183] It can be understood that the 3D printing device 3 of the present application has a nozzle structure 10 that can fully melt the consumable, so that it can be applicable to high-speed printing. The 3D printing device 3 may further include other necessary functional units for realizing 3D printing, which will not be elaborated here.

[0184] In the foregoing, the specific implementation manners of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific implementation manners of the present application without departing from the scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A nozzle structure having a feed end and a discharge end spaced apart in a first direction; characterized in that, The nozzle structure includes: A first heat conducting member, on which a first material passage is provided, and the first material passage is configured to convey the consumable entering from the feeding end. A nozzle, which is connected to one end of the first heat conducting member close to the discharging end. A second material passage is provided on the nozzle. The first heat conducting member and the nozzle are sequentially connected along the first direction, so that the second material passage is communicated with the first material passage. The second material passage is configured to convey the consumable entering the second material passage from the first material passage to the discharging end.

2. The nozzle structure according to claim 1, characterized in that, The nozzle structure further includes: A heating member, on which an inner channel is provided. Wherein, the first heat conducting member is arranged in the inner channel, and the first heat conducting member is thermally coupled with the heating member for heating the consumable located in the first material passage. One end of the nozzle connected to the first heat conducting member is at least partially arranged in the inner channel. The area of the nozzle located in the inner channel is thermally coupled with the heating member for continuously heating the consumable sent from the first material passage to the second material passage.

3. The sprinkler head structure according to claim 2, wherein, The nozzle includes: A heating part, one end of which is connected to the first heat conducting member. The heating part is located in the inner channel. The heating part is thermally coupled with the heating member and is connected to the inner wall of the heating member. A nozzle part, which is connected to the other end of the heating part far from the first heat conducting member. The nozzle part at least partially extends out of the heating member along the first direction.

4. The nozzle structure according to claim 3, characterized in that, The extending length of the inner channel along the first direction is greater than or equal to the sum of the extending length of the heating part along the first direction and the extending length of the first heat conducting member along the first direction.

5. The nozzle structure according to claim 3, characterized in that, The heating part includes: A first area part, one end of which is connected to the nozzle part. The first area part is connected to the inner wall of the heating member and is thermally coupled with the heating member. A second area part, which protrudes from the end face of the other end of the first area part far from the nozzle part. The second area part is detachably connected to the first heat conducting member. The second area part is at least partially located in the first material passage. The area of the second area part located in the first material passage is in contact with the inner wall of the first heat conducting member and is thermally coupled with the first heat conducting member.

6. The nozzle structure according to claim 5, characterized in that, A first connecting part protrudes from the outer wall of the second area part. One end of the first heat conducting member close to the discharging end abuts against the first connecting part. A second connecting part protrudes from the end face of one end of the first heat conducting member close to the discharging end towards the discharging end. Wherein, the first connecting part and the second connecting part are snap-connected to at least limit the movement of the first heat conducting member in the direction away from the discharging end.

7. The nozzle structure according to claim 6, wherein The number of the first connecting parts is set to be at least two. At least two first connecting parts are arranged at intervals around the axis of the second area part, and a receiving space is formed between any two adjacent first connecting parts. The receiving space is configured to accommodate the second connecting part. Along the rotation direction of the nozzle, a first clamping protrusion protrudes from the side of the first connecting part close to the second connecting part, and a second clamping protrusion protrudes from the side of the second connecting part close to the adjacent first clamping protrusion. Wherein, along the first direction, the first clamping protrusion and the second clamping protrusion are arranged in a staggered manner, and a clamping groove is formed between the first clamping protrusion and the end face of the first area portion close to the second area portion, and the clamping groove is configured to accommodate the second clamping protrusion.

8. The nozzle structure according to claim 7, wherein, Along the first direction, one side of the first clamping protrusion close to the second clamping protrusion has a first guiding surface, and the first guiding surface is inclined from the end close to the first connecting portion towards the direction away from the second clamping protrusion to guide the second clamping protrusion into the clamping groove; Along the first direction, one side of the second clamping protrusion close to the first clamping protrusion has a second guiding surface, and the second guiding surface is inclined from the end close to the second connecting portion towards the direction away from the first clamping protrusion to cooperate with the first guiding surface to guide the second clamping protrusion into the clamping groove.

9. The nozzle structure according to claim 6, characterized in that, The first connecting portion contacts the inner wall of the heating member and is thermally coupled to the heating member; One side of the second connecting portion contacts the outer wall of the second area portion and is thermally coupled to the second area portion, and the other side of the second connecting portion contacts the inner wall of the heating member and is thermally coupled to the heating member.

10. The nozzle structure according to claim 1, characterized in that, The nozzle structure further includes: A second heat conducting member, which is arranged in the first heat conducting member and is thermally coupled to the first heat conducting member, and a third material channel is arranged on the second heat conducting member, and the third material channel communicates the first material channel and the second material channel; A convex portion is arranged on the inner wall of the second heat conducting member, and the convex portion protrudes from the first position of the inner wall of the second heat conducting member towards the central axis direction of the third material channel or the second position of the inner wall of the second heat conducting member.

11. The nozzle structure according to claim 10, wherein, The second heat conducting member is detachably connected to the first heat conducting member.

12. The nozzle structure according to claim 11, wherein The first material channel includes a first section and a second section that are sequentially communicated, and the cross-sectional area of the first section is larger than that of the second section, so that a first step surface is formed between the first section and the second section. The second heat conducting member is located in the first section, the third material channel communicates with the second section, one end of the second heat conducting member abuts against the first step surface, and the other end abuts against the nozzle.

13. The nozzle structure according to claim 10, characterized in that, The second heat conducting member is integrally formed and connected to the inner wall of the first heat conducting member.

14. A nozzle kit, characterized in that, It includes an extrusion assembly, a heat dissipation assembly, and the nozzle structure according to any one of claims 1 to 13, and the nozzle structure is connected to the heat dissipation assembly and the extrusion assembly.

15. A 3D printing device, characterized in that, It includes a device main body, a printing platform, and the nozzle structure according to any one of claims 1 to 13 or the nozzle kit according to claim 14, and the nozzle structure and the printing platform are respectively movably connected to the device main body.

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