Nozzle structure and 3D printer

Abstract

The application relates to the field of 3D printing, in particular to a nozzle structure and a 3D printer. The nozzle structure comprises a heat dissipation assembly, a heating assembly which is arranged along a first direction and is spaced apart from the heat dissipation assembly, a nozzle assembly which is sequentially arranged along the first direction and is arranged in the heating assembly and the heat dissipation assembly, and a fixing assembly which is screw-connected to the heat dissipation assembly and can be screwed in or out along a second direction relative to the heat dissipation assembly so as to tightly press or loosen the nozzle assembly, wherein the second direction is perpendicular to the first direction. The application realizes quick installation and quick disassembly, and improves the installation and disassembly efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of 3D printing, and particularly relates to a nozzle structure and a 3D printer. BACKGROUND

[0002] Fused deposition modeling (FDM) is a method of printing a three-dimensional object by layering and accumulating a consumable material after being heated and melted.

[0003] When the nozzle of the 3D printer is blocked, the nozzle needs to be disassembled from the 3D printer, cleaned and reinstalled. If the nozzle is blocked seriously, the nozzle needs to be replaced. Therefore, the convenience of disassembling and installing the nozzle is very important.

[0004] In the related art, the nozzle often does not have a quick release function. Even if some nozzles can achieve quick release, the disassembly process is cumbersome, which seriously affects the installation and removal efficiency. SUMMARY

[0005] The nozzle structure and the 3D printer provided by the embodiments of the present application not only can achieve quick installation and quick disassembly, but also are convenient to install and disassemble, and improve the installation and removal efficiency.

[0006] In a first aspect, the nozzle structure provided by the embodiments of the present application comprises:

[0007] a heat dissipation assembly;

[0008] a heating assembly, which is arranged along a first direction and spaced apart from the heat dissipation assembly;

[0009] a nozzle assembly, which is sequentially arranged along the first direction and passes through the heating assembly and the heat dissipation assembly; and

[0010] a fixing assembly, which is threadedly connected to the heat dissipation assembly and can be screwed into or out of the heat dissipation assembly along a second direction to abut or release the nozzle assembly, wherein the second direction is perpendicular to the first direction.

[0011] In some embodiments, the fixing assembly comprises:

[0012] a guide member, which is connected to the heat dissipation assembly;

[0013] an abutting member, which is limited in the guide member and can move along the second direction relative to the guide member; and

[0014] a fastener, which is threadedly connected to the heat dissipation assembly, and one end of the fastener abuts the abutting member;

[0015] The fastener is capable of being screwed in or out relative to the heat dissipation assembly in the second direction to make the abutting member abut or release the nozzle assembly.

[0016] In some embodiments, the fastener comprises a threaded connection portion and a handle portion arranged in sequence in the second direction, the threaded connection portion is threadedly connected to the heat dissipation assembly and abuts the abutting member, and the handle portion is exposed to the heat dissipation assembly.

[0017] The fixing assembly further comprises a first elastic member arranged on a side of the handle portion facing the heat dissipation assembly.

[0018] When the abutting member abuts the nozzle assembly, the first elastic member is compressed between the handle portion and the heat dissipation assembly in the second direction.

[0019] In some embodiments, the fixing assembly further comprises a second elastic member, the second elastic member is sleeved on the guide member, and one end of the second elastic member close to the nozzle assembly abuts the heat dissipation assembly, and the other end of the second elastic member away from the nozzle assembly abuts the abutting member.

[0020] When the fastener makes the abutting member abut the nozzle assembly, the second elastic member is compressed between the abutting member and the heat dissipation assembly in the second direction.

[0021] In some embodiments, the heat dissipation assembly is provided with a first assembly hole extending in the first direction and an assembly cavity communicating with one side of the first assembly hole.

[0022] The nozzle assembly is arranged through the first assembly hole and exposed to the assembly cavity.

[0023] The guide member, the abutting member and the second elastic member are arranged in the assembly cavity, and one end of the second elastic member close to the nozzle assembly abuts the cavity wall of the assembly cavity.

[0024] In some embodiments, the fixing assembly comprises two guide members, the two guide members are symmetrically arranged about the central axis of the abutting member, and one second elastic member is sleeved on each guide member.

[0025] The two ends of the abutting member arranged opposite to each other are sleeved on one guide member respectively.

[0026] In some embodiments, a first matching groove is arranged on a side of the abutting member facing the nozzle assembly, the first matching groove has two groove walls arranged at an included angle, and the two groove walls are symmetrically arranged about the central axis of the nozzle assembly.

[0027] In the case that the abutting member abuts against the nozzle assembly, the two groove walls are in linear contact or surface contact with the outer wall of the nozzle assembly, respectively.

[0028] In some embodiments, the nozzle assembly comprises a first pipe and a second pipe connected in a first direction, wherein the first pipe is arranged through the heating assembly, and the second pipe is arranged through the heat dissipation assembly.

[0029] The heating assembly is provided with a second assembly hole matched with the first pipe, and a hole wall of the second assembly hole is matched with an outer surface of the first pipe.

[0030] The outer radial dimension of the first pipe gradually decreases in a direction close to the second pipe.

[0031] In some embodiments, a second matching groove is arranged on the hole wall of the second assembly hole, and a limiting part is formed on the first pipe.

[0032] The limiting part is inserted into the second matching groove to limit the rotation of the first pipe arranged through the heating assembly relative to the heating assembly.

[0033] In some embodiments, the nozzle assembly further comprises a reinforcing pipe arranged outside the second pipe, and the reinforcing pipe is used to abut against the fixing assembly.

[0034] In some embodiments, the heating assembly comprises a uniform temperature member and a heating member.

[0035] The heating member is configured as a cylindrical structure arranged outside the uniform temperature member.

[0036] The uniform temperature member is arranged apart from the heat dissipation assembly, and the uniform temperature member is used to transfer the heat of the heating member to the first pipe to heat the consumable passing through the first pipe.

[0037] The second assembly hole is arranged on the uniform temperature member.

[0038] In some embodiments, the nozzle structure further comprises a heat insulation assembly.

[0039] The heat insulation assembly is connected between the heat dissipation assembly and the heating assembly, and the heat insulation assembly comprises a body and a plurality of connecting members.

[0040] The body is detachably connected to the heating assembly, and the body is provided with a third assembly hole matched with the heating assembly.

[0041] All the connecting pieces are arranged around the axis of the third assembly hole and are connected between the body and the heat-dissipating component respectively to block heat transfer from the body or the heating component to the heat-dissipating component.

[0042] In some embodiments, the connecting piece is detachably connected to the body through a first fixing piece, a heat-insulating piece is sleeved on the first fixing piece, and the heat-insulating piece is arranged between the first fixing piece and the body to block heat transfer from the body or the heating component to the first fixing piece.

[0043] In some embodiments, the heat-insulating component includes three connecting pieces, and the central axes of the three connecting pieces are located at the corresponding vertices of an isosceles triangle respectively, and the geometric center of the isosceles triangle is located on the axis of the third assembly hole.

[0044] In some embodiments, the at least one connecting piece is a first connecting piece, the first connecting piece is connected to the heat-dissipating component through a second fixing piece, a third matching groove is arranged at one end of the first connecting piece connected to the heat-dissipating component, the third matching groove is configured as an annular groove with a central axis in the first direction, and the second fixing piece is threadedly connected to the heat-dissipating component in a direction perpendicular to the first direction and abuts against the groove wall of the third matching groove.

[0045] In some embodiments, the at least one connecting piece is a second connecting piece, the second connecting piece includes a first connecting part and a second connecting part which are perpendicular to each other and integrated, the first connecting part is detachably connected to the body through a first fixing piece, and the first connecting part and the second connecting part are at least partially embedded in the heat-dissipating component and detachably connected to the heat-dissipating component through a third fixing piece.

[0046] In some embodiments, the third assembly hole is a threaded hole threadedly connected with the heating component, and a fourth assembly hole is further arranged on the body and penetrates through the third assembly hole in a direction perpendicular to the first direction, and the fourth assembly hole is a threaded hole.

[0047] The nozzle structure further includes a fourth fixing piece, the fourth fixing piece is threadedly connected in the fourth assembly hole and abuts against the heating component.

[0048] In the second aspect, the 3D printer provided by the embodiments of the present application includes the nozzle structure provided by any of the above embodiments.

[0049] In some embodiments, the 3D printer further includes a base, and the heat-dissipating component is connected to the base through a pressure collecting piece.

[0050] In some embodiments, the 3D printer further includes a limiter, the heat dissipation assembly is further connected to the base via the limiter, and the limiter and the pressure collection member are respectively disposed at two ends of the heat dissipation assembly in the first direction;

[0051] Wherein, the limiting member is threadedly connected to the base and penetrates into the heat dissipation assembly along the first direction.

[0052] Compared with the prior art, the beneficial features of the embodiments of the present application are: the nozzle structure and the 3D printer, the nozzle structure, include a heat dissipation component, a heating component, a nozzle assembly and a fixing component, the heating component and the heat dissipation component are spaced apart along a first direction, the nozzle assembly is sequentially passed through the heating component and the heat dissipation component along the first direction, the fixing component is threadedly connected to the heat dissipation component, and can be screwed in or out along a second direction relative to the heat dissipation component to tighten or loosen the nozzle assembly; through the implementation method of the present application, the nozzle assembly is sequentially passed through the heating component and the heat dissipation component along the first direction, and the nozzle assembly can be fixed to the heating component and the heat dissipation component by screwing the fixing component in along the second direction, which can achieve quick installation, and the installation process is simple, which improves the installation efficiency, and the nozzle assembly can be loosened by unscrewing the fixing component along the second direction, which facilitates the rapid separation of the nozzle assembly from other components, thereby achieving quick disassembly, and the disassembly process is simple, which improves the disassembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a three-dimensional diagram of the nozzle structure of an embodiment of the present application;

[0054] Figure 2 for Figure 1 Another perspective view of the nozzle structure shown;

[0055] Figure 3 for Figure 1 The exploded view of the nozzle structure is shown;

[0056] Figure 4 for Figure 1 A schematic structural diagram of the nozzle structure shown;

[0057] Figure 5 for Figure 4 AA section enlarged view;

[0058] Figure 6 for Figure 4 BB cross-sectional view;

[0059] Figure 7 for Figure 1 A partial enlarged view of the nozzle structure shown;

[0060] Figure 8 for Figure 1 An enlarged view of the fixed components in the nozzle structure shown;

[0061] Figure 9 for Figure 1 An enlarged view of the heating component in the nozzle structure shown;

[0062] Figure 10 for Figure 9 CC cross-sectional view;

[0063] Figure 11 for Figure 1 An enlarged view of the heat insulation component in the nozzle structure is shown;

[0064] Figure 12 for Figure 11 Another perspective diagram of the thermal insulation assembly shown;

[0065] Figure 13 for Figure 11 Another perspective diagram of the thermal insulation assembly shown;

[0066] Figure 14 for Figure 13 DD cross-sectional view;

[0067] Figure 15 for Figure 1 The stress distribution simulation diagram of the nozzle structure under dynamic conditions is shown;

[0068] Figure 16 for Figure 1 The temperature distribution simulation diagram of the nozzle structure shown in the working state of the heating component;

[0069] Wherein: 1-heat dissipation assembly (11-heat dissipation fin (111-first assembly hole, 112-assembly cavity, 113-fifth assembly hole, 114-sixth assembly hole, 115-seventh assembly hole, 116-ninth assembly hole, 117-fifth matching groove, 118-sixth matching groove, 119-eighth assembly hole)), 2-heating assembly (21-uniform part (211-second assembly hole, 212-second matching groove), 22-heating part, 23-protection shell, 24-temperature sensor), 3-nozzle assembly (3a-feeding end, 3b-discharging end, 31-first pipe part (311-outer side, 312-limiting part), 32-second pipe part, 33-strengthening pipe part, 34-heat dissipation pipe part, 35-hot end nozzle part), 4-fixing assembly (41-guide part, 42-abutment part (421-first matching groove (4211-groove wall)), 43-fastening part (431-threaded connection part, 432-handle part (4321-fourth matching groove)), 44-first elastic part, 45-second elastic part), 5-heat insulation assembly (51-body (511-third assembly hole, 512-fourth assembly hole), 52-first fixing part, 53-heat insulation part, 54-first connecting part (541-third matching groove), 55-second fixing part, 56-second connecting part (561-first connecting part, 562-second connecting part), 57-third fixing part, 58-fourth fixing part), 6-pressure collecting part (61-tenth assembly hole), 7-fifth fixing part, 8-limiting part. DETAILED DESCRIPTION

[0070] For the purpose of promoting the understanding and facilitating appreciation of the application, the application will be described in more detail below with reference to the accompanying drawings. The preferred embodiments of the application are shown in the drawings for the purpose of illustration. It should be noted, however, that the application can be practiced in many different forms and is not limited to the embodiments described herein. Rather, the embodiments are provided as examples of the disclosure of the application.

[0071] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present.

[0072] Unless otherwise defined, all 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. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0073] Reference will now be made to Figures 1 to 5The nozzle structure of the embodiment of the present application comprises a heat dissipation assembly 1, a heating assembly 2, a nozzle assembly 3 and a fixing assembly 4. The heating assembly 2 is arranged in the first direction and spaced apart from the heat dissipation assembly 1. The nozzle assembly 3 is sequentially arranged in the first direction and passes through the heating assembly 2 and the heat dissipation assembly 1. The fixing assembly 4 is threadedly connected to the heat dissipation assembly 1. The fixing assembly 4 can be screwed in the second direction relative to the heat dissipation assembly 1 to abut against the nozzle assembly 3. The fixing assembly 4 can be screwed out in the second direction relative to the heat dissipation assembly 1 to release the nozzle assembly 3. The second direction is perpendicular to the first direction.

[0074] In the embodiment of the present application, the nozzle assembly 3 has an opposite feeding end 3a and discharging end 3b. The heating assembly 2 is used to heat the part of the nozzle assembly 3 close to the discharging end 3b, so as to melt the consumables in the part, so that the discharging end 3b of the nozzle assembly 3 can extrude the consumables in the molten state. The heat dissipation assembly 1 is used to dissipate heat to the part of the nozzle assembly 3 close to the feeding end 3a, so that the consumables in the part are not melted and can be smoothly fed towards the discharging end 3b.

[0075] In the embodiment of the present application, the heating assembly 2 is arranged in the first direction and spaced apart from the heat dissipation assembly 1. The nozzle assembly 3 is sequentially arranged in the first direction and passes through the heating assembly 2 and the heat dissipation assembly 1. The fixing assembly 4 is screwed in the second direction to fix the nozzle assembly 3 and the heat dissipation assembly 1, so as to fix the nozzle assembly 3 in the heat dissipation assembly 1 and the heating assembly 2, so as to realize fast installation, convenient use, simple installation process, improved installation efficiency, firm fixation and stable nozzle structure in high-speed movement. The fixing assembly 4 is screwed out in the second direction to release the nozzle assembly 3, so that the nozzle assembly 3 is separated from the heat dissipation assembly 1 and the heating assembly 2 in the first direction, so as to quickly separate the nozzle assembly 3 from other assemblies of the nozzle structure, realize fast disassembly, simplify the fast disassembly steps, improve the disassembly efficiency, solve the problem of complicated fast disassembly operation in the related art, realize one-torque fast disassembly and convenient user use.

[0076] In some preferred embodiments, please refer to Figure 5 , Figure 7 and Figure 8The fixing assembly 4 can include a guide 41, an abutting member 42 and a fastener 43. The guide 41 is connected to the heat dissipation assembly 1 and extends along the second direction. The abutting member 42 is limited on the guide 41, specifically, the abutting member 42 is threaded on the guide 41 along the second direction and cannot be separated from the guide 41, the abutting member 42 can only move along the second direction on the guide 41 relative to the guide 41 and cannot rotate relative to the guide 41 around the second direction. The fastener 43 is screwed to the heat dissipation assembly 1 and extends along the second direction, one end of the fastener 43 abuts against the abutting member 42. The fastener 43 can be screwed in along the second direction relative to the heat dissipation assembly 1 to apply a pushing force along the second direction to the abutting member 42 until the abutting member 42 abuts the nozzle assembly 3 between the abutting member 42 and the heat dissipation assembly 1. The fastener 43 can also be screwed out along the second direction relative to the heat dissipation assembly 1 to cancel the pushing force so that the abutting member 42 no longer abuts against the nozzle assembly 3, thereby releasing the nozzle assembly 3.

[0077] In the embodiment, the abutting member 42 can only move along the second direction, thereby avoiding the abutting member 42 from rotating with the fastener 43 when the fastener 43 is screwed in or out, which causes the abutting member 42 to fail to effectively fix the nozzle assembly 3.

[0078] As an optional embodiment, please refer to Figure 5 , Figure 7 and Figure 8 The fixing assembly 4 can include two guides 41, the two guides 41 are symmetrically arranged about the central axis of the abutting member 42, and the abutting member 42 is sleeved on one guide 41 at each end, so that the abutting member 42 can move more stably and effectively along the second direction, and the abutting member 42 can be further prevented from rotating, thereby further improving the abutting effect.

[0079] As an optional embodiment, please refer to Figure 5 The central axis of the abutting member 42 and the central axis of the fastener 43 can be located on the same straight line L, so that the abutting member 42 is more uniformly stressed and can more stably abut against the nozzle assembly 3 or more effectively release the nozzle assembly 3.

[0080] As an example, the guide 41 can be screwed to the heat dissipation assembly 1, which is more convenient for installing and dismounting the guide 41.

[0081] In some preferred embodiments, please refer to Figure 5 , Figure 7 and Figure 8The fastener 43 comprises a threaded connecting portion 431 and a handle portion 432 which are fixedly integrated along the second direction. The threaded connecting portion 431 is threadedly connected to the heat dissipation assembly 1 and can abut against the abutting member 42, and the handle portion 432 is exposed to the heat dissipation assembly 1. By rotating the handle portion 432, the threaded connecting portion 431 can be screwed in or out along the second direction, so that the abutting member 42 can be tightly abutted against or loosened from the nozzle assembly 3.

[0082] In some more preferred embodiments, referring to Figure 5 and Figure 8 , the fixing assembly 4 can further comprise a first elastic member 44 which is arranged on the side of the handle portion 432 facing the heat dissipation assembly 1. When the abutting member 42 tightly abuts against the nozzle assembly 3, the first elastic member 44 is compressed between the handle portion 432 and the heat dissipation assembly 1 along the second direction. The first elastic member 44 compressed along the second direction can apply a pushing force to the fastener 43 away from the heat dissipation assembly 1. That is, the elastic restoring force of the first elastic member 44 keeps the fastener 43 in a tensioned state, thereby reducing the thread gap between the threaded connecting portion 431 and the heat dissipation assembly 1, preventing the fastener 43 from rotating relative to the heat dissipation assembly 1 during high-speed operation of the nozzle structure, further improving the stability of the nozzle structure, and thereby solving the problem of deflection of the fastener 43 after long-term use, without changing the performance of the nozzle structure even after long-term use.

[0083] As an optional embodiment, referring to Figure 5 and Figure 8 , the first elastic member 44 can be a wear-resistant nitrile O-ring. The wear-resistant nitrile O-ring has the characteristic of elastic restoring force after being extruded, so that the thread gap between the threaded connecting portion 431 and the heat dissipation assembly 1 is smaller, preventing the fastener 43 from rotating relative to the heat dissipation assembly 1 during high-speed operation of the nozzle structure, and further improving the stability of the nozzle structure.

[0084] As an exemplary embodiment, referring to Figure 5 , a fourth matching groove 4321 is formed on the side of the handle portion 432 facing the heat dissipation assembly 1. The first elastic member 44 is interference-fitted with the fourth matching groove 4321, thereby avoiding the first elastic member 44 from falling out of the fourth matching groove 4321, and making the installation more reliable. Specifically, part of the first elastic member 44 is embedded in the fourth matching groove 4321, and another part of the first elastic member 44 is exposed to the fourth matching groove 4321, making the installation convenient and facilitating replacement of the first elastic member 44. When the fastener 43 is screwed in place, the first elastic member 44 is extruded between the handle portion 432 and the heat dissipation assembly 1, and the elastic restoring force of the first elastic member 44 acts as a pushing force on the fastener 43, which can prevent the fastener 43 from rotating relative to the heat dissipation assembly 1.

[0085] It should be noted that in other embodiments, the first elastic member 44 can also be of other materials or other elastic structures, which will not be repeated here.

[0086] In some preferred embodiments, referring to Figures 1 to 5 , Figure 7 and Figure 8 , the fixing assembly 4 can further include a second elastic member 45. The second elastic member 45 is sleeved on the guide member 41, and one end of the second elastic member 45 close to the nozzle assembly 3 abuts against the heat dissipation assembly 1, and the other end of the second elastic member 45 away from the nozzle assembly 3 abuts against the abutting member 42. In the case that the fastener 43 makes the abutting member 42 abut against the nozzle assembly 3, the second elastic member 45 is compressed between the abutting member 42 and the heat dissipation assembly 1 in the second direction, and the first elastic member 44 compressed in the second direction can apply a pushing force to the fastener 43 away from the heat dissipation assembly 1, thereby further reducing the thread gap between the threaded connection part 431 and the heat dissipation assembly 1, and further solving the problem that the fastener 43 is deflected after long-term use, that is, the performance of the nozzle structure will not change even after long-term use. And when the nozzle assembly 3 needs to be disassembled, as long as the fastener 43 is screwed out in the second direction, due to the compression of the second elastic member 45 between the abutting member 42 and the heat dissipation assembly 1 in the second direction, under the action of the elastic force of the second elastic member 45, the abutting member 42 can quickly loosen the nozzle assembly 3, effectively avoiding the situation that the abutting member 42 is stuck on the guide member 41, causing the abutting member 42 to be unable to loosen the nozzle assembly 3.

[0087] As an optional embodiment, referring to Figures 1 to 5 , Figure 7 and Figure 8 , the second elastic member 45 can be a compression spring, which is easy to install, and when the second elastic member 45 fails, it is also convenient to replace the second elastic member 45.

[0088] It should be noted that in other embodiments, the second elastic member 45 can also be of other elastic structures, which will not be repeated here.

[0089] It can be understood that when the fixing assembly 4 includes a plurality of guide members 41, a second elastic member 45 is correspondingly sleeved on each guide member 41, so that the fastener 43 and the abutting member 42 are more uniformly stressed.

[0090] In some examples, referring to Figures 1 to 6The heat dissipation assembly 1 comprises a heat dissipation fin 11, and the heat dissipation fin 11 is provided with a first assembly hole 111 and an assembly cavity 112. The first assembly hole 111 extends through the heat dissipation fin 11 along a first direction, and the assembly cavity 112 is communicated with one side of the first assembly hole 111. The nozzle assembly 3 is arranged in the first assembly hole 111, and part of the outer surface of the nozzle assembly 3 is exposed to the assembly cavity 112. The guide piece 41, the abutting piece 42 and the second elastic piece 45 are arranged in the assembly cavity 112, so as to protect the guide piece 41, the abutting piece 42 and the second elastic piece 45 and improve the service life of the fixing assembly 4. Correspondingly, one end of the second elastic piece 45 close to the nozzle assembly 3 is abutted to the cavity wall of the assembly cavity 112. The heat dissipation fin 11 is further provided with a fifth assembly hole 113, a sixth assembly hole 114 and a seventh assembly hole 115 which are communicated with the assembly cavity 112. The fifth assembly hole 113 is a threaded hole which is screwed with the threaded connection part 431. Specifically, the fifth assembly hole 113 is a through hole and is arranged on the side of the assembly cavity 112 away from the first assembly hole 111. The sixth assembly hole 114 and the seventh assembly hole 115 are arranged corresponding to the guide piece 41. Specifically, the sixth assembly hole 114 is a through hole and is arranged on the side of the assembly cavity 112 away from the first assembly hole 111. The seventh assembly hole 115 is arranged on the first side of the assembly cavity 112 close to the first assembly hole 111, and the seventh assembly hole 115 can be a threaded hole. One end of the guide piece 41 is provided with an external thread matched with the seventh assembly hole 115. The end of the guide piece 41 provided with the external thread can be inserted into the sixth assembly hole 114 along a second direction and then extended into the assembly cavity 112, and then the abutting piece 42 and the second elastic piece 45 are sequentially sleeved on the end of the guide piece 41 extended into the assembly cavity 112, and then the guide piece 41 is screwed into the seventh assembly hole 115, so as to limit the abutting piece 42 and the second elastic piece 45 on the guide piece 41. This not only facilitates installation, but also effectively protects the guide piece 41, the abutting piece 42 and the second elastic piece 45.

[0091] In some preferred embodiments, please refer to Figure 5 , Figure 7 and Figure 8 The side of the abutting piece 42 facing the nozzle assembly 3 can be provided with a first matching groove 421. In the case that the abutting piece 42 abuts against the nozzle assembly 3, the nozzle assembly 3 abuts against the groove wall 4211 of the first matching groove 421.

[0092] In some more preferred embodiments, please refer to Figure 8The first matching groove 421 has two groove walls 4211 arranged at an included angle, and the two groove walls 4211 are symmetrically arranged about the center axis of the nozzle assembly 3 and symmetrically abut the nozzle assembly 3, so that the nozzle assembly 3 is more uniformly stressed and has a larger stress area, reducing damage to the nozzle assembly 3, thereby solving the problem of damage to the nozzle assembly 3 after long-term use, so that the nozzle assembly 3 is not prone to rust.

[0093] As an example, the cross-sectional shape of the first matching groove 421 can be V-shaped, as shown in Figure 8 When the abutting member 42 abuts against the nozzle assembly 3, the two groove walls 4211 are in line contact with the outer wall of the nozzle assembly 3. Compared with point contact, the two groove walls 4211 of the first matching groove 421 are in line contact with the outer wall of the nozzle assembly 3, so that the nozzle assembly 3 is more dispersedly and uniformly stressed and has a larger stress area, thereby reducing damage to the nozzle assembly 3, thereby solving the problem of damage to the nozzle assembly 3 after long-term use, so that the nozzle assembly 3 is not prone to rust. Moreover, even if the nozzle assembly 3 has a machining error, the two groove walls 4211 of the first matching groove 421 can be in line contact with the outer wall of the nozzle assembly 3, ensuring the stability of the nozzle structure and avoiding shaking of the nozzle assembly 3 during high-speed operation of the nozzle structure.

[0094] As an example, the cross-sectional shape of the first matching groove 421 can also be U-shaped, and the two groove walls 4211 are smoothly connected as a whole. When the abutting member 42 abuts against the nozzle assembly 3, the two groove walls 4211 are in surface contact with the outer wall of the nozzle assembly 3, so that the stress area is larger, thereby reducing damage to the nozzle assembly 3, thereby solving the problem of damage to the nozzle assembly 3 after long-term use, so that the nozzle assembly 3 is not prone to rust.

[0095] In some preferred embodiments, please refer to Figure 3 , Figure 6 and Figure 7The nozzle assembly 3 comprises a first pipe 31 and a second pipe 32, which are fixedly connected along the first direction, wherein the first pipe 31 is arranged in the heating assembly 2, and the second pipe 32 is arranged in the heat dissipation assembly 1. The heating assembly 2 is provided with a second assembly hole 211 matched with the first pipe 31, and the hole wall of the second assembly hole 211 is attached to the outer surface of the first pipe 31, that is, the first pipe 31 and the heating assembly 2 are attached in a surface-to-surface manner, so that the first pipe 31 is heated more uniformly, and the heat transfer efficiency is improved. The outer radial dimension of the first pipe 31 gradually decreases along the direction close to the second pipe 32, and correspondingly, the hole diameter of the second assembly hole 211 gradually decreases along the direction close to the second pipe 32, which not only prevents the first pipe 31 arranged in the heating assembly 2 from moving upward along the first direction relative to the heating assembly 2, but also realizes the rapid limiting of the nozzle assembly 3 in the heating assembly 2, and improves the stability of the nozzle structure. Moreover, the present embodiment also facilitates the separation of the nozzle assembly 3 from the heating assembly 2. When the nozzle assembly 3 needs to be disassembled, the fastener 43 can be screwed to make the nozzle assembly 3 automatically fall off under the action of gravity, and the gradual decrease of the outer radial dimension of the first pipe 31 along the direction close to the second pipe 32 facilitates the rapid disassembly of the nozzle assembly 3. In addition, the present embodiment can also increase the heat transfer area.

[0096] As an optional embodiment, please refer to Figure 3 , Figure 6 and Figure 7 The outer side surface 311 of the first pipe 31 can be a circular truncated cone surface with a diameter gradually decreasing along the direction close to the second pipe 32, and correspondingly, the hole wall of the second assembly hole 211 is also a circular truncated cone surface with a diameter gradually decreasing along the direction close to the second pipe 32. The circular truncated cone surface is in contact with the circular truncated cone surface, is heated more uniformly, can increase the heat transfer area, and can effectively prevent the nozzle assembly 3 from moving upward, thereby improving the stability of the nozzle structure.

[0097] As an optional embodiment, please refer to Figure 6 One end of the second pipe 32 is inserted into the first pipe 31 along the first direction, and the first pipe 31 and the second pipe 32 are in interference fit, which is more reliable in connection.

[0098] As an example, the second pipe 32 can be a titanium pipe. It should be noted that in other embodiments, the second pipe 32 can also be made of other materials.

[0099] In some more preferred embodiments, please refer to Figure 6The second assembly hole 211 is provided with a second matching groove 212 on the hole wall. The outer side surface 311 of the first pipe 31 is provided with a limiting part 312 exposed to the outer side surface 311. When the first pipe 31 is inserted into the heating assembly 2 along the first direction, the limiting part 312 can be inserted into the second matching groove 212 along the first direction, so as to prevent the nozzle assembly 3 inserted into the heating assembly 2 from rotating relative to the heating assembly 2, so that the nozzle structure is more reliable and stable.

[0100] As an optional embodiment, please refer to Figure 6 , two second matching grooves 212 can be provided on the hole wall of the second assembly hole 211, and the two second matching grooves 212 are arranged in axial symmetry about the axis of the second assembly hole 211. Correspondingly, the first pipe 31 is fixed with two limiting parts 312, and the two limiting parts 312 are arranged in one-to-one correspondence with the two second matching grooves 212, and each limiting part 312 is inserted into the corresponding second matching groove 212 along the first direction, so that the nozzle assembly 3 is more uniform in stress.

[0101] Since the nozzle assembly 3 and the abutting member 42 are fixed by pressure, the second pipe 32 inserted into the heat dissipation assembly 1 needs to bear the pressure applied by the abutting member 42. In some more preferred embodiments, please refer to Figure 3 , and Figures 5 to 7 The nozzle assembly 3 further comprises a reinforcing pipe 33, which is sleeved and fixed outside the second pipe 32, and the reinforcing pipe 33 is used to abut against the abutting member 42 to avoid the abutting member 42 from pressing the second pipe 32, thereby improving the service life of the nozzle assembly 3.

[0102] As an optional embodiment, the reinforcing pipe 33 is coated with chromium after SKD11 nitriding, so that the reinforcing pipe 33 has greater hardness and is not easy to rust.

[0103] In some more preferred embodiments, please refer to Figure 3 , Figure 6 and Figure 7 The nozzle assembly 3 further comprises a heat dissipation pipe 34, which is sleeved and fixed outside the second pipe 32, and the heat dissipation pipe 34 is in interference fit with the second pipe 32, so that the heat of the second pipe 32 can be more quickly and effectively transmitted to the heat dissipation assembly 1 through the heat dissipation pipe 34.

[0104] As an optional embodiment, the heat dissipation pipe 34 is arranged closer to the first pipe 31 than the reinforcing pipe 33, so as to avoid heat transmission to the fixing assembly 4 as much as possible, thereby improving user experience and safety.

[0105] In some more preferred embodiments, please refer to Figure 3 , Figure 6 and Figure 7The nozzle assembly 3 further comprises a hot-end nozzle piece 35, which is inserted into one end of the first pipe piece 31 away from the second pipe piece 32, and the hot-end nozzle piece 35 is in interference fit with the first pipe piece 31, thereby improving the structural stability of the nozzle assembly 3.

[0106] In some preferred embodiments, referring to Figure 6 , Figure 9 and Figure 10 The heating assembly 2 comprises a uniform-temperature piece 21 and a heating piece 22. The uniform-temperature piece 21 is arranged in spaced-apart relationship with the heat-dissipation assembly 1, and the second assembly hole 211 is formed in the uniform-temperature piece 21. The heating piece 22 is configured as a cylindrical structure that is sleeved outside the uniform-temperature piece 21, and the heating piece 22 is used to heat the uniform-temperature piece 21, which is used to uniformly transfer the heat from the heating piece 22 to the nozzle assembly 3 inserted into the uniform-temperature piece 21, so as to uniformly and effectively heat the consumable to a molten state. As an example, the heating piece 22 can be an annular ceramic ring, which is used to heat the uniform-temperature piece 21, thereby achieving fast disassembly and making the heat transfer more efficient and solving the problem of uneven heating of the nozzle assembly 3.

[0107] As an example, in order to facilitate disassembly and protect the heating piece 22, the heating piece 22 and the uniform-temperature piece 21 are in clearance fit.

[0108] As an alternative embodiment, referring to Figure 6 , Figure 9 and Figure 10 The heating assembly 2 can further comprise a protective shell 23, which is wrapped outside the uniform-temperature piece 21 and the heating piece 22, so as to avoid heat leakage, thereby ensuring the heating effect and being more secure.

[0109] As an alternative embodiment, referring to Figure 10 In order to better control the heating effect, the heating assembly 2 can further comprise a temperature sensor 24.

[0110] In some preferred embodiments, referring to Figures 1 to 4 , Figure 6 and Figures 11 to 14 The nozzle structure further comprises a heat-insulation assembly 5, which is connected between the heat-dissipation assembly 1 and the heating assembly 2, so as to block the heat transfer from the body 51 or the heating assembly 2 to the heat-dissipation assembly 1, thereby preventing the occurrence of thermal creep of the consumable.

[0111] Specifically, the heat insulation assembly 5 can include a body 51 and a plurality of connecting members. The body 51 is detachably connected to the heating assembly 2. As an example, the body 51 is provided with a third assembly hole 511 matched with the uniform temperature member 21. All the connecting members are arranged around the axis of the third assembly hole 511 and are respectively connected between the body 51 and the heat dissipation assembly 1, so that not only the heating assembly 2 and the heat dissipation assembly 1 can be firmly fixed together through the heat insulation assembly 5, but also the heat of the heating assembly 2 can be effectively prevented from being transmitted from the body 51 to the heat dissipation assembly 1, so as to not only ensure the heating effect of the heating assembly 2, but also as much as possible avoid the heat of the body 51 or the heating assembly 2 from being transmitted towards the heat dissipation assembly 1, prevent the occurrence of heat creep of the consumable, and also avoid the heat from being transmitted to the fixing assembly 4, thereby improving the user experience.

[0112] As an optional embodiment, the connecting member can be made of heat insulation material. As an example, the connecting member can be made of a composite material of polyether ether ketone (PEEK) and glass fiber (GF), which not only has high temperature resistance, but also has wear resistance, thereby improving the service life of the heat dissipation assembly 1.

[0113] It should be noted that in other embodiments, the connecting member can also be made of other materials, which will not be described here.

[0114] In some more preferred embodiments, please refer to Figure 6 and Figure 14 The connecting member can be detachably connected to the body 51 through the first fixing member 52, and the first fixing member 52 is sleeved with the heat insulation member 53, which is arranged between the first fixing member 52 and the body 51, so that the first fixing member 52 and the body 51 are not in direct contact and have a gap therebetween, thereby preventing the heat from being transmitted from the body 51 to the first fixing member 52, so as to as much as possible prevent the heat from being transmitted from the body 51 or the heating assembly 2 to the heat dissipation assembly 1.

[0115] As an example, the first fixing member 52 can be a threaded member. For example, the first fixing member 52 can be a screw.

[0116] As an optional embodiment, please refer to Figures 11 to 14The heat insulation assembly 5 comprises three connecting members, the central axes of the three connecting members are located at the corresponding vertices of an isosceles triangle, the geometric center of the isosceles triangle is located on the axis of the third assembly hole 511, not only can the heat insulation assembly 5 be stably and effectively connected with the heating assembly 2 and the heat dissipation assembly 1, but also the second pipe 32 can pass through the heat insulation assembly 5, compared with only one or two connecting members, the three connecting members can bear forces from different directions, in addition to the heat insulation effect, the second pipe 32 can also be protected, and the second pipe 32 can be effectively prevented from being broken.

[0117] In some preferred embodiments, referring to Figures 11 to 14 The at least one connecting member is a first connecting member 54, the first connecting member 54 is detachably connected to the body 51 through a first fixing member 52, and the first connecting member 54 is detachably connected to the heat dissipation assembly 1 through a second fixing member 55, the first fixing member 52 does not directly contact the heat dissipation fins 11, further prevents the heat of the heating assembly 2 from being transmitted from the body 51 to the heat dissipation assembly 1, so as to block the heat transmitted from the body 51 or the heating assembly 2 to the heat dissipation assembly 1 as much as possible, and further improve the heat insulation effect. One end of the first connecting member 54 connected to the heat dissipation assembly 1 is provided with a third matching groove 541, the third matching groove 541 is configured as an annular groove with a central axis in the first direction, the second fixing member 55 is threadedly connected to the heat dissipation assembly 1 in a direction perpendicular to the first direction, and the end of the second fixing member 55 abuts against the groove wall 4211 of the third matching groove 541, so as to fix the first connecting member 54 to the heat dissipation assembly 1.

[0118] As an optional embodiment, referring to Figure 13 The third matching groove 541 can be an annular groove with a V-shaped cross section, so that the second fixing member 55 can more firmly abut against the groove wall 4211 of the third matching groove 541, and the overall stability of the nozzle structure is improved.

[0119] As an example, the second fixing member 55 can be a threaded member. For example, the second fixing member 55 can be a screw.

[0120] In some more preferred embodiments, in order to improve the stability of the overall structure, each first connecting member 54 is connected to the heat dissipation assembly 1 through two second fixing members 55, and the two second fixing members 55 are symmetrically arranged about the central axis of the first connecting member 54.

[0121] As an example, the fin 11 can be provided with an eighth assembly hole 119 which is plugged with the first connecting piece 54. The eighth assembly hole 119 can be a light hole. Two ninth assembly holes 116 are symmetrically provided on the hole wall of the eighth assembly hole 119. The ninth assembly holes 116 correspond to the second fixing piece 55 one by one. The ninth assembly holes 116 can be threaded holes and through holes. During installation, the first connecting piece 54 can be inserted into the eighth assembly hole 119 first, and then the second fixing piece 55 is screwed into the corresponding ninth assembly hole 116 until the end of the second fixing piece 55 abuts against the third matching groove 541.

[0122] In some preferred embodiments, please refer to Figures 11 to 14 , the at least one connecting piece is the second connecting piece 56. The second connecting piece 56 includes a first connecting part 561 and a second connecting part 562 which are perpendicular to each other and fixed integrally. The first connecting part 561 is detachably connected to the body 51 by the first fixing piece 52, and the second connecting part 562 is detachably connected to the heat dissipation assembly 1 by the third fixing piece 57. The first fixing piece 52 does not directly contact the fin 11, further preventing the heat of the heating assembly 2 from being transmitted from the body 51 to the heat dissipation assembly 1, so as to block the heat transmission from the body 51 or the heating assembly 2 to the heat dissipation assembly 1 as much as possible, and further improve the heat insulation effect.

[0123] As an example, the third fixing piece 57 can be a threaded piece. For example, the third fixing piece 57 can be a screw.

[0124] In some more preferred embodiments, the first connecting part 561 is at least partially embedded in the heat dissipation assembly 1, and the second connecting part 562 is at least partially embedded in the heat dissipation assembly 1, which is more convenient for quickly and accurately positioning the second connecting piece 56 on the heat dissipation assembly 1, and can avoid the rotation of the second connecting piece 56 relative to the heat dissipation assembly 1.

[0125] As an example, the two outer sides of the fin 11 can be provided with a fifth matching groove 117 and a sixth matching groove 118 which are communicated and integrated. The first connecting part 561 is partially embedded in the fifth matching groove 117, and the second connecting part 562 is partially embedded in the sixth matching groove 118.

[0126] As an example, the third fixing piece 57 can be a threaded piece. For example, the third fixing piece 57 can be a screw. Figures 11 to 14 The heat insulation assembly 5 includes three connecting pieces, which are one first connecting piece 54 and two second connecting pieces 56. The two first connecting pieces 54 are symmetrically arranged about the axis of the third assembly hole 511, which not only facilitates installation, but also is firm and stable in connection. In addition, Figure 2 、 Figure 6 and Figure 15It can be seen that the second pipe 32 is partially exposed between the heat dissipation pipe 34 and the first pipe 31, and the stress of the part of the first pipe 31 is greater than that of other parts of the first pipe 31. In the embodiment, under the dynamic condition of high-speed nozzle structure operation, when a 100N force is applied to the nozzle structure in the Z direction, please refer to Figure 15 It can be seen that the maximum stress of the nozzle structure is close to 94MPa, and the maximum stress of the first pipe 31 is less than 11MPa, which is far less than the tensile strength of the first pipe 31, and the risk of fracture of the first pipe 31 is low, so the embodiment can effectively avoid the fracture of the second pipe 32.

[0127] In the embodiment, the heat insulation assembly 5 has good heat insulation performance, so that the high temperature of the heating assembly 2 can be less transmitted to the heat dissipation assembly 1, thereby further preventing the occurrence of consumable thermal creep. Please refer to Figure 16 It can be seen that the temperature of the part of the second pipe 32 exposed to the first pipe 31 is less than 43℃, and the maximum temperature of the first pipe 31 and the hot end nozzle piece 35 is as high as 210℃ or more, so the nozzle structure of the embodiment can effectively avoid the melting of the consumable in the second pipe 32, so that the consumable in the second pipe 32 can be smoothly transported to the first pipe 31.

[0128] In some preferred embodiments, please refer to Figures 11 to 14 The third assembly hole 511 is a threaded hole for screwing with the heating assembly 2. The body 51 further has a fourth assembly hole 512, which is a threaded hole and penetrates the third assembly hole 511 in a direction perpendicular to the first direction. The nozzle structure further comprises a fourth fixing piece 58 for further fastening the heating assembly 2 and the heat insulation assembly 5. Specifically, the fourth fixing piece 58 is screwed into the fourth assembly hole 512, and the end of the fourth fixing piece 58 abuts against the heating assembly 2.

[0129] As an optional embodiment, please refer to Figure 3 , Figure 6 , and Figures 11 to 14 The third assembly hole 511 is a threaded hole for screwing with the uniform temperature piece 21, and the fourth fixing piece 58 is a threaded piece, which is screwed into the fourth assembly hole 512, and the end of the fourth fixing piece 58 abuts against the uniform temperature piece 21, thereby firmly fixing the heating assembly 2 and the heat insulation assembly 5, preventing the uniform temperature piece 21 from being deflected relative to the body 51 after installation.

[0130] As an example, please refer to Figure 14 The nozzle assembly 3 can comprise a plurality of fourth fixing pieces 58, thereby further improving the fastening effect.

[0131] In some examples, the fourth fixing member 58 may be a screw.

[0132] The 3D printer according to the embodiment of the present application includes the nozzle structure provided by any of the above embodiments.

[0133] In the embodiment of the present application, the heating component 2 and the heat dissipation component 1 are spaced apart along the first direction, and the nozzle component 3 is sequentially inserted into the heating component 2 and the heat dissipation component 1 along the first direction. The nozzle component 3 can be fixed to the heat dissipation component 1 by screwing the fixing component 4 in the second direction, thereby fixing the nozzle component 3 in the heat dissipation component 1 and the heating component 2, achieving quick installation, and being easy to use and having a simple installation process, thereby improving installation efficiency. The nozzle component 3 can be loosened by unscrewing the fixing component 4 in the second direction, and the nozzle component 3 can fall off from the heat dissipation component 1 and the heating component 2 along the first direction, thereby quickly separating the nozzle component 3 from other components of the nozzle structure, achieving quick disassembly, improving disassembly efficiency, solving the problem of cumbersome quick disassembly operation in the related art, and achieving one-twist quick disassembly, which is convenient for users to use.

[0134] In some preferred embodiments, the 3D printer further comprises a base (not shown), and the heat sink 11 of the heat dissipation assembly 1 is connected to the base by means of Figures 1 to 4 The pressure collecting member 6 shown is connected to the base, and the pressure collecting member 6 can collect the pressure signal provided by the heat sink 11.

[0135] As an example, please refer to Figure 1 The pressure collection member 6 can be a strain gauge. The heat sink 11 and the pressure collection member 6 are fixedly connected by a fifth fixing member 7. The pressure collection member 6 is fixed to the base by a sixth fixing member (not shown). The pressure collection member 6 is provided with a tenth assembly hole 61 that cooperates with the sixth fixing member.

[0136] As an example, the fifth fixing member 7 and the sixth fixing member can both be threaded members. For example, the fifth fixing member 7 can be a screw. The sixth fixing member can be a screw.

[0137] In some preferred embodiments, the 3D printer further includes a limiter 8, see Figures 1 to 4 The heat dissipation component 1 is also connected to the base through a limiter 8. The limiter 8 and the pressure collection component 6 are respectively arranged at both ends of the heat dissipation component 1 in the first direction, thereby effectively preventing the nozzle structure from shaking during high-speed movement.

[0138] As an optional embodiment, the limit member 8 can be threadedly connected to the base, and the limit member 8 is inserted into the heat sink 11 of the heat dissipation component 1 along the first direction, which is not only convenient for installation, but also can effectively limit the heat dissipation component 1, making the heat dissipation component 1 more secure and stable to install.

[0139] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations of technical features do not have contradictions, they shall be considered within the scope of the present disclosure.

[0140] The above embodiments only express the preferred embodiments of the present application, which are described in a more specific and detailed manner, but should not be construed as limiting the scope of the patent application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims

1. A nozzle structure, characterized by, The application relates to a fixing assembly for a nozzle assembly. The fixing assembly comprises: a heat dissipation component; a heating component, which is arranged in a first direction and spaced apart from the heat dissipation component; a nozzle assembly, which is sequentially arranged in the first direction and passes through the heating component and the heat dissipation component; and a fixing assembly, which comprises two guide members connected to the heat dissipation component, an abutting member, which is arranged in a second direction and symmetrically arranged about the central axis of the abutting member, a second elastic member, which is arranged on the guide member and abuts against the heat dissipation component, and a fastener, which is threadedly connected to the heat dissipation component and abuts against the abutting member, wherein the fastener can be screwed in or out in the second direction to make the abutting member abut or release the nozzle assembly, and the second elastic member is compressed between the abutting member and the heat dissipation component when the fastener makes the abutting member abut the nozzle assembly, and wherein the second direction is perpendicular to the first direction.

2. The nozzle structure of claim 1, wherein The fastener comprises a threaded connection part and a handle part, which are sequentially arranged in the second direction, the threaded connection part is threadedly connected to the heat dissipation component and abuts against the abutting member, and the handle part is exposed to the heat dissipation component. The fixing assembly further comprises a first elastic member, which is arranged on the side of the handle part facing the heat dissipation component. The first elastic member is compressed between the handle part and the heat dissipation component when the abutting member abuts the nozzle assembly.

3. The nozzle structure of claim 1, wherein The heat dissipation component is provided with a first assembly hole extending in the first direction and an assembly cavity connected to one side of the first assembly hole. The nozzle assembly passes through the first assembly hole and is exposed to the assembly cavity. The guide member, the abutting member and the second elastic member are arranged in the assembly cavity, and one end of the second elastic member close to the nozzle assembly abuts against the cavity wall of the assembly cavity.

4. The nozzle structure of claim 1, wherein The side of the abutting member facing the nozzle assembly is provided with a first matching groove, and the first matching groove has two groove walls arranged at an included angle, and the two groove walls are symmetrically arranged about the central axis of the nozzle assembly. The two groove walls are in linear contact or surface contact with the outer wall of the nozzle assembly when the abutting member abuts the nozzle assembly.

5. The nozzle structure of claim 1, wherein The nozzle assembly comprises a first pipe member and a second pipe member connected in a first direction, wherein the first pipe member passes through the heating component, and the second pipe member passes through the heat dissipation component. The heating component is provided with a second assembly hole matched with the first pipe member, and the hole wall of the second assembly hole is matched with the outer surface of the first pipe member. The outer radial dimension of the first pipe member gradually decreases in the direction close to the second pipe member.

6. The nozzle structure of claim 5, wherein The hole wall of the second assembly hole is provided with a second matching groove, and the first pipe member is formed with a limiting part. The limiting part is inserted into the second matching groove to limit rotation of the first pipe arranged in the heating assembly relative to the heating assembly.

7. The nozzle structure of claim 5, wherein The nozzle assembly further comprises a reinforcing pipe sleeved outside the second pipe, and the reinforcing pipe is used to abut against the fixing assembly.

8. The nozzle structure of claim 5, wherein The heating assembly comprises a uniform heating part and a heating part. The heating part is configured as a cylindrical structure sleeved outside the uniform heating part. The uniform heating part is arranged apart from the heat dissipation assembly, and the uniform heating part is used to transfer heat of the heating part to the first pipe to heat the consumable passing through the first pipe. The second assembly hole is formed in the uniform heating part.

9. The nozzle structure of claim 1, wherein The nozzle structure further comprises a heat insulation assembly. The heat insulation assembly is connected between the heat dissipation assembly and the heating assembly, and the heat insulation assembly comprises a body and a plurality of connecting parts. The body is detachably connected to the heating assembly, and a third assembly hole matched with the heating assembly is formed in the body. All the connecting parts are arranged apart around an axis of the third assembly hole and are respectively connected between the body and the heat dissipation assembly to block heat transfer from the body or the heating assembly to the heat dissipation assembly.

10. The nozzle structure of claim 9, wherein The connecting part is detachably connected to the body through a first fixing part, and a heat insulation part is sleeved on the first fixing part, and the heat insulation part is arranged between the first fixing part and the body to block heat transfer from the body or the heating assembly to the first fixing part.

11. The nozzle structure of claim 9, wherein The heat insulation assembly comprises three connecting parts, and central axes of the three connecting parts are respectively located at corresponding vertices of an isosceles triangle, and a geometric center of the isosceles triangle is located on the axis of the third assembly hole.

12. The nozzle structure of claim 11, wherein At least one of the connecting parts is a first connecting part, and the first connecting part is connected to the heat dissipation assembly through a second fixing part, and a third matching groove is formed in one end of the first connecting part connected to the heat dissipation assembly, and the third matching groove is configured as an annular groove with a central axis in the first direction, and the second fixing part is threadedly connected to the heat dissipation assembly in a direction perpendicular to the first direction and abuts against a groove wall of the third matching groove.

13. A nozzle structure according to claim 11 or 12, wherein Two of the connecting parts are second connecting parts, and the two second connecting parts are symmetrically arranged about the central axis of the isosceles triangle, and the second connecting part comprises a first connecting part and a second connecting part which are perpendicular to each other and integrated, and the first connecting part is detachably connected to the body through a first fixing part, and the first connecting part and the second connecting part are respectively at least partially embedded in the heat dissipation assembly and detachably connected to the heat dissipation assembly through a third fixing part.

14. The nozzle structure of claim 9, wherein The third assembly hole is a threaded hole threadedly connected to the heating assembly, and a fourth assembly hole is further formed in the body and penetrates the third assembly hole in a direction perpendicular to the first direction, and the fourth assembly hole is a threaded hole. The nozzle structure further comprises a fourth fixing part, and the fourth fixing part is threadedly connected into the fourth assembly hole and abuts against the heating assembly.

15. A 3D printer characterized by, The nozzle structure comprises the nozzle structure according to any one of claims 1 to 14.

16. The 3D printer of claim 15, wherein, The 3D printer further comprises a base, and the heat dissipation assembly is connected to the base through a pressure collecting piece.

17. The 3D printer of claim 16, wherein, The 3D printer further comprises a limiting piece, and the heat dissipation assembly is connected to the base through the limiting piece; the limiting piece and the pressure collecting piece are respectively arranged at two ends of the heat dissipation assembly in the first direction. The limiting piece is threadedly connected to the base and penetrates into the heat dissipation assembly along the first direction.

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