Print head module and 3D printing apparatus

Abstract

The present application relates to the field of 3D printing. Provided are a print head module and a 3D printing apparatus, aiming to solve the problem in 3D printing apparatuses in the known art of a consumable being likely to be pulled at an angle during transverse movement of a nozzle assembly and causing frictional damage. The print head module comprises an extrusion assembly, a nozzle assembly and a material tube assembly. The material tube assembly comprises a tube and a tube head; the tube has an in-tube passage; and the tube head has a tube head hole channel, wherein the tube head hole channel has one end in communication with the in-tube passage and the other end configured as a tapered hole. The extrusion assembly has a first consumable passage. The nozzle assembly has a second consumable passage; the nozzle assmebly is fixedly connected to the extrusion assembly. The extrusion assembly is provided with an outward protruding boss, and an inlet of the first consumable passage is located on the boss; and the tapered hole is configured to be sleeved outside the boss; in a state in which the tapered hole is sleeved outside the boss, a movement clearance is formed between the tapered hole and the boss, enabling the tube head to rotate relative to the boss.

Description

Print head module and 3D printing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420574125.4 filed on March 22, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to the field of 3D printing, and more specifically, to a print head module and a 3D printing device. Background Art

[0004] 3D printing equipment, such as some 3D printing equipment based on FDM (Fused Deposition Modeling) technology, uses linear consumables that are heated, melted and extruded after being conveyed through an extrusion structure.

[0005] In the known technology, a material pipe is provided between the material rack and the extrusion assembly or between the extrusion assembly and the nozzle assembly on the supply path of the consumables, and the material pipe is fastened to the consumables inlet of the extrusion assembly or the inlet of the nozzle assembly.

[0006] Summary of the Invention

[0007] The present application provides a print head module and a 3D printing device to solve the problem in known 3D printing devices that when the extrusion assembly and the nozzle assembly move together or the nozzle assembly moves alone, the consumables may be pulled obliquely and cause friction damage.

[0008] The embodiment of the present application is implemented as follows:

[0009] In a first aspect, the present application provides a print head module, which includes an extrusion assembly, a nozzle assembly, and a material pipe assembly. The material pipe assembly includes a pipe fitting and a pipe head; the pipe fitting has an inner tube channel, and the pipe head is connected to the end of the pipe fitting; the pipe head has a pipe head hole, one end of which is connected to the inner tube channel and the other end is configured as a tapered hole. The extrusion assembly includes a first consumable material channel, a boss, and an extrusion mechanism, the boss is located at the entrance of the first consumable material channel; the extrusion mechanism is disposed on the first consumable material channel and is configured to drive the consumable material to be transported in the first consumable material channel. The nozzle assembly has a second consumable material channel, the nozzle assembly is fixedly connected to the extrusion assembly, and the second consumable material channel is connected to the first consumable material channel. The tapered hole is configured to be sleeved outside the boss, and when the tapered hole is sleeved outside the boss, there is a movable gap between the tapered hole and the boss to enable the pipe head to rotate relative to the boss.

[0010] In one possible implementation:

[0011] The outer peripheral surface of the boss is a tapered surface, and the tapered angle of the tapered surface is smaller than the tapered angle of the tapered hole.

[0012] In one possible implementation:

[0013] The cone angle of the tapered hole is 5-15° larger than the cone angle of the tapered surface.

[0014] In one possible implementation:

[0015] The pipe head has a first end surface facing the boss, and a first transition fillet is provided at the intersection line between the first end surface and the hole surface of the tapered hole.

[0016] In one possible implementation:

[0017] The pipe head is connected to the pipe fitting through a connecting sleeve. A connecting hole is provided at one end of the pipe head away from the tapered hole. The pipe fitting is plugged into the inner hole of the connecting sleeve. The outer periphery of the connecting sleeve has a sealing structure that is sealed and connected to the connecting hole.

[0018] In one possible implementation:

[0019] The extrusion assembly also includes a shell, an inlet pipe, and an outlet pipe. The shell encloses an internal space, the inlet pipe is connected to the shell near the inlet side of the first consumable channel, and the outlet pipe is connected to the shell near the outlet side of the first consumable channel. The inlet pipe and the outlet pipe are arranged in the shell with a relative spacing and define the first consumable channel. The extrusion mechanism extends between the inlet pipe and the outlet pipe to extrude the passing consumable from the inlet pipe side to the outlet pipe side; the shell includes a top wall near the inlet side of the first consumable channel, and a boss protrudes from the top wall toward the outlet side away from the first consumable channel.

[0020] In one possible implementation:

[0021] The boss has a second end surface facing the tube head, and a second transition fillet is provided at the intersection of the second end surface and the hole surface at the entrance of the first consumable channel.

[0022] In the second aspect, the present application also provides a print head module connected to an extrusion assembly, wherein the extrusion assembly has a first consumables channel for conveying consumables. The print head module includes a nozzle assembly and a material tube assembly. The nozzle assembly has a second consumables channel and a boss, and the boss is located at the entrance of the second consumables channel. The material tube assembly includes a pipe fitting and a pipe head; the pipe fitting has an inner tube channel and connects the extrusion assembly and the nozzle assembly; the pipe head has a pipe head channel, one end of the pipe head channel is connected to the inner tube channel, and the other end is set as a tapered hole. Wherein, the tapered hole is constructed to be sleeved outside the boss, and when the tapered hole is sleeved outside the boss, there is a movable gap between the tapered hole and the boss, so that the pipe head can rotate relative to the boss.

[0023] In a third aspect, the present application further provides a 3D printing device comprising an optical axis and a print head module, wherein the optical axis is arranged along the X-direction. The extrusion assembly and the nozzle assembly of the print head module are slidably connected to the optical axis along the X-direction; or, the 3D printing device comprises an optical axis, an extrusion assembly, and a print head module, wherein the optical axis is arranged along the X-direction, the extrusion assembly is fixed relative to the optical axis, the nozzle assembly is slidably connected to the optical axis along the X-direction, and the extrusion assembly and the nozzle assembly are connected by a consumable tube.

[0024] In one possible implementation:

[0025] The 3D printing device also includes a base assembly, a printing platform assembly, and a gantry. The printing platform assembly is movably coupled to the base assembly along the Y-axis. The gantry is connected to the base assembly. The optical axis is movably connected to the gantry along the Z-axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] FIG1 is a schematic structural diagram of a 3D printing device according to one or more embodiments of the present application;

[0028] FIG2 is a schematic structural diagram of a print head module of the 3D printing device of FIG1 ;

[0029] FIG3 is a cross-sectional view of the print head module in FIG2 (partial structure is hidden);

[0030] FIG4 is a partially enlarged view of FIG3 ;

[0031] FIG5 is an expanded view of FIG4;

[0032] FIG6 shows a schematic structural diagram of a print head module according to one or more embodiments of the present application.

[0033] Description of the main component symbols: 3D printing equipment 100 base assembly 10 gantry 11 printing platform assembly 12 optical axis 13 material rack 14 material tray 15 print head module 16, 16A material tube assembly 17 nozzle assembly 18 linear bearing 19 boss 20 pipe 21 pipe head 22 sealing structure 23 extrusion assembly 24 heat dissipation part 25 heating nozzle part 26 shell 27 inlet pipe 28 outlet pipe 29 extrusion mechanism 30 top wall 31 connecting sleeve 32 driving assembly 33 bracket 34 connecting frame 35 consumables 300 first consumables channel K1 channel in the tube K2 pipe head channel K3 tapered hole K4 connecting hole K5 inner hole K6 second consumables channel K7 movable gap f1 tapered surface P1 first end surface P2 second end surface P3 first transition fillet C1 second transition fillet C2 inner space Q1 DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered therein. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an element centered therein. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be an element centered therein. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the relevant listed items.

[0037] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0038] In some known 3D printing devices, when the extrusion assembly and the nozzle assembly move laterally (displacement in the X direction), the consumables from the material tube to the extrusion assembly or the nozzle assembly may be pulled obliquely, and the consumables may be pulled obliquely to the edge of the consumable inlet of the extrusion assembly or the nozzle assembly, causing friction damage to the consumables during the extrusion process.

[0039] In view of this, an embodiment of the present application provides a 3D printing device that can solve the above problems.

[0040] 1 to 3 , this embodiment provides a 3D printing device 100 , including a base assembly 10 , a gantry 11 , a printing platform assembly 12 , an optical axis 13 , a print head module 16 , and a material rack 14 .

[0041] The printing platform assembly 12 is used to support printed parts. The printing platform assembly 12 is movably coupled to the base assembly 10 along the Y direction and can be driven by a Y-direction drive structure. The gantry 11 is connected to the base assembly 10 along the Z direction (vertical direction in the figure).

[0042] The optical axis 13 is arranged along the X direction. In this embodiment, there are two optical axes 13.

[0043] The material rack 14 is used to carry a material tray 15 on which a linear consumable material 300 is wound. The consumable material 300 on the material tray 15 can be supplied to the print head module 16. The material rack 14 can be fixed to the base assembly 10.

[0044] The printhead module 16 includes an extruder assembly 24, a material pipe assembly 17, and a nozzle assembly 18. In this embodiment, the extruder assembly 24 and the nozzle assembly 18 are fixedly connected together and are movably connected to the optical axis 13 along the X-axis. The extruder assembly 24 has a first consumable channel K1 for extruding consumables into the nozzle assembly 18; the nozzle assembly 18 has a second consumable channel K7 for heating and melting the consumables passing through it, so that the consumables can be ejected from the outlet of the second consumable channel K7 and printed on the printing platform assembly 12.

[0045] To provide reliable support, in this embodiment, two optical axes 13 are provided, and the extrusion assembly 24 and the nozzle assembly 18 are slidably mounted on the optical axis 13 via a sliding sleeve or a linear bearing 19. The extrusion assembly 24 and the nozzle assembly 18 can be fixed on the same bracket 34, and the linear bearing 19 is provided on the bracket 34.

[0046] One end of the material pipe assembly 17 is used to pass the consumables 300 from the material tray 15 , and the other end corresponds to the extrusion assembly 24 and is used to supply the consumables 300 to the extrusion assembly 24 .

[0047] The optical axis 13 is movably connected to the gantry 11 along the Z direction.

[0048] The drive assembly 33 can be an XZ combined drive assembly. The drive assembly 33 is connected to the bracket 34 to drive the bracket 34, the extrusion assembly 24 and the nozzle assembly 18 to move along the X direction. The drive assembly 33 is also connected to the optical axis 13 to drive the optical axis 13 to move along the Z direction.

[0049] In other embodiments, the driving assembly 33 may also only drive the bracket 34, the extrusion assembly 24 and the nozzle assembly 18 to move along the X direction (which can be driven by a transmission belt assembly), and the movement of the optical axis 13 relative to the gantry 11 along the Z direction can be driven by other driving structures, which are not limited here.

[0050] Through the above settings, the 3D printing device 100 in this embodiment can realize the displacement of the extrusion component 24 and the nozzle component 18 relative to the printing platform component 12 along the X direction, Y direction or Z direction. Combined with the consumables 300 supplied by the material tray 15, a printed part can be printed on the printing platform component 12.

[0051] Referring to Figures 2-4 , in this embodiment, the extrusion assembly 24 has a first consumable material channel K1; the extrusion assembly 24 is provided with an outwardly protruding boss 20, which is located at the entrance of the first consumable material channel K1. The material tube assembly 17 includes a tube 21 and a tube head 22; the tube 21 has an inner tube channel K2, and the tube head 22 is connected to the end of the tube 21; the tube head 22 has a tube head channel K3, one end of which is connected to the inner tube channel K2 and the other end is provided with a tapered hole K4. The tapered hole K4 is configured to be able to be inserted outside the boss 20. When the tapered hole K4 is inserted outside the boss 20, a movable gap f1 is provided between the tapered hole K4 and the boss 20, allowing the tube head 22 to rotate relative to the boss 20.

[0052] During use, the tapered hole K4 of the nozzle head 22 is first inserted over the boss 20, connecting the nozzle head channel K3 with the first consumable channel K1. The linear consumable 300 then passes through the tube 21 and nozzle head 22 and into the inlet of the first consumable channel K1 of the extrusion assembly 24. The linear consumable 300 is then driven by the extrusion assembly 24 into the second consumable channel K7 of the nozzle assembly 18. After being heated and melted, the linear consumable 300 is extruded from the outlet of the second consumable channel K7 to form a printed part.

[0053] During this process, the consumables 300 are pulled by the extrusion action of the extrusion assembly 24, and the friction with the tube 21 exerts a force on the tube 21 and the tube head 22 to move closer to the extrusion assembly 24, thereby pressing the tube head 22 onto the boss 20, preventing the consumables 300 at this location from being exposed during the printing process.

[0054] Therefore, in this embodiment, the material pipe assembly 17 and the extrusion assembly 24 do not need to be fastened to each other through threaded connection or other directions, and the structure is simple.

[0055] In addition, there is a movable gap f1 between the tapered hole K4 and the boss 20, so that when the extrusion assembly 24 and the nozzle assembly 18 are displaced laterally (i.e., in the X direction) during printing, the tube head 22 can be tilted and rotated at a certain angle relative to the boss 20 to prevent the wire from being pulled obliquely and pressed against the edge of the entrance of the first consumable channel K1, thereby preventing the edge from being damaged.

[0056] In this embodiment, the outer peripheral surface of the boss 20 is a conical surface P1, and the cone angle of the conical surface P1 is smaller than the cone angle of the conical hole K4. Specifically, the conical hole K4 is a conical hole, the conical surface P1 is a conical surface, and the cone angle of the conical hole K4 is 5-15 degrees larger than the cone angle of the conical surface P1. In this way, the movable gap f1 between the conical hole K4 and the conical surface P1 is fan-shaped in the axial cross-section of the two. When the extrusion assembly 24 and the nozzle assembly 18 slide along the X direction relative to the optical axis 13, the tube head 22 is pulled by the consumable 300 and moves along the X direction with the extrusion assembly 24. At the same time, it can also deflect to the left or right along the X direction relative to the boss 20. This deflection causes the edge of the tube head 22 to deviate from the consumable 300, thereby avoiding the problem of friction damage between the consumable 300 and the edge of the tube head 22.

[0057] Referring to Figure 4, the tube head 22 has a first end face P2 facing the boss 20, and a first transition fillet C1 is provided at the intersection of the first end face P2 and the hole surface of the tapered hole K4 (i.e., the edge of the tapered hole K4 of the tube head 22), which can further keep the edge away from the consumable 300 and further improve the safety of the consumable 300.

[0058] Referring to Figure 5 , in this embodiment, the tube head 22 is connected to the pipe fitting 21 via a connecting sleeve 32. A connecting hole K5 is provided at the end of the tube head 22, away from the tapered hole K4. The pipe fitting 21 is inserted into the inner hole K6 of the connecting sleeve 32. The outer periphery of the connecting sleeve 32 has a sealing structure 23, which is sealed to the connecting hole K5. During use, the connecting sleeve 32 is first fixedly sleeved onto the end of the pipe fitting 21, and then the connecting sleeve 32 is fitted into the connecting hole K5 of the tube head 22.

[0059] Referring to Figure 3 again, in this embodiment, the nozzle assembly 18 includes a heat dissipation part 25 and a heating nozzle part 26. The extrusion assembly 24 is connected to the heating nozzle part 26 through the heat dissipation part 25. The consumables 300 can be driven by the extrusion assembly 24 to pass through the heat dissipation part 25 and the heating nozzle part 26 and be extruded from the heating nozzle part 26.

[0060] In this embodiment, the extrusion assembly 24 includes a shell 27, an inlet pipe 28, an outlet pipe 29 and an extrusion mechanism 30. The shell 27 encloses an internal space Q1, the inlet pipe 28 is connected to the inlet side of the shell 27 close to the first consumable channel K1, and the outlet pipe 29 is connected to the outlet side of the shell 27 close to the first consumable channel K1, and the inlet pipe 28 and the outlet pipe 29 are arranged in the shell 27 with a relative spacing, and define the first consumable channel K1. The extrusion mechanism 30 extends between the inlet pipe 28 and the outlet pipe 29, and is used to extrude the passing consumable 300 from the side of the inlet pipe 28 to the side of the outlet pipe 29. The extrusion mechanism 30 may include a driving wheel and a driven wheel, and the consumable is pressed between the driving wheel and the driven wheel. When the driving wheel rotates, the consumable is driven downward by friction.

[0061] The housing 27 includes a top wall 31 near the entrance of the first consumables channel K1, and the boss 20 protrudes upward from the top wall 31. The first consumables channel K1 passes through the top wall 31 and the boss 20 to the second end surface P3.

[0062] Optionally, the outlet pipe 29 is integrally formed with the shell 27, and the inlet pipe 28 is separately provided with the shell 27, and the inlet pipe 28 is fitted on the shell 27 by plugging. In this way, when the inlet pipe 28 is worn, it can be easily replaced.

[0063] The boss 20 has a second end face P3 facing the tube head 22. A second transition radius C2 is provided at the intersection of the second end face P3 and the aperture surface at the entrance of the first consumable channel K1. The second transition radius C2 also avoids and protects the consumable 300 from being damaged by the edge of the entrance of the first consumable channel K1.

[0064] The print head module 16 in the aforementioned embodiment adopts a proximal extrusion solution in which the extrusion assembly 24 and the nozzle assembly 18 are directly connected together. In other embodiments, a distal extrusion solution may also be adopted, which will be described in detail below.

[0065] Referring to FIG6 , this embodiment provides a 3D printing device employing a remote extrusion solution, comprising an extrusion assembly 24 and a printhead module 16a. The printhead module 16a is connected to the extrusion assembly 24, and the extrusion assembly 24 has a first consumables channel K1 for conveying consumables. The printhead module 16a comprises a nozzle assembly 18 and a material pipe assembly 17. Unlike the printhead module 16, in the printhead module 16a, the extrusion assembly 24 is fixed relative to the optical axis 13 in the X-direction, while the nozzle assembly 18 is slidably disposed relative to the optical axis 13 in the X-direction. Specifically, connecting brackets 35 can be connected at both ends of the optical axis 13, which are slidably engaged with the gantry in the Z-direction. The extrusion assembly is fixed to one of the connecting brackets 35. A boss 20 is disposed on the nozzle assembly 18, rather than on the extrusion assembly 24. Specifically, the boss 20 is disposed at the inlet end of the second consumables channel K7 of the nozzle assembly 18.

[0066] The material pipe assembly 17 is arranged between the extrusion assembly 24 and the nozzle assembly 18, and one end of the material pipe assembly 17 is fixedly connected to the extrusion assembly 24, and the tapered hole K4 of the tube head 22 at the other end can be sleeved on the boss 20 on the nozzle assembly 18, thereby realizing the communication between the first consumable channel K1 of the extrusion assembly 24 and the second consumable channel K7 of the nozzle assembly 18.

[0067] When the printhead module 16a is in use, the consumables 300 on the material tray 15 can enter the first consumable channel K1 of the extrusion assembly 24 through an additional feed tube. The feed tube and the extrusion assembly 24 do not move relative to each other and are fixedly connected. The tapered hole K4 of the tube head 22 is then inserted into the outside of the boss 20, connecting the tube head 22 and the second consumable channel K7. The linear consumables 300 then flows from the extrusion assembly 24 from the first consumable channel K1 through the tube 21 and tube head 22 to the inlet of the second consumable channel K7 of the nozzle assembly 18. After being driven by the nozzle assembly 18 and heated and melted, the consumables are ejected from the outlet of the second consumable channel K7, thereby forming a printed part.

[0068] During this process, the consumables 300, driven by the extrusion action of the extrusion assembly 24, exerts a force on the tube 21 and the tube head 22 close to the nozzle assembly 18 through the friction with the tube 21, thereby pressing the tube head 22 onto the boss 20 to prevent the consumables 300 from being exposed during the printing process.

[0069] Therefore, the print head module 16a in the embodiment of the present application does not need to be fastened to each other by threaded connection or other directions, and the structure is simple.

[0070] In addition, there is a movable gap f1 between the tapered hole K4 and the boss 20 (refer to Figure 4), so that when the nozzle assembly 18 moves along the X direction during printing, the tube head 22 can be tilted and rotated at a certain angle relative to the boss 20 to prevent the wire from being pulled obliquely and pressed against the edge of the entrance of the first consumable channel K1, thereby preventing the edge from being damaged.

[0071] Based on the above description, in the print head module 16 / 16A and the 3D printing device 100 in the embodiment of the present application, the tube head 22 of the material tube assembly 17 can be deflected relative to the boss 20, and when the extrusion assembly 24 / nozzle assembly 18 moves horizontally along the X-axis 13, the consumable material 300 is not easily pulled obliquely and caused contact friction damage.

[0072] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A print head module, characterized in that: Including extrusion assembly, nozzle assembly and material pipe assembly; The material pipe assembly includes a pipe fitting and a pipe head; the pipe fitting has an inner tube passage, and the pipe head is connected to the end of the pipe fitting; the pipe head has a pipe head hole, one end of which is connected to the inner tube passage and the other end is set as a tapered hole; The extrusion assembly includes a first consumable material channel, a boss, and an extrusion mechanism, wherein the boss is located at the entrance of the first consumable material channel; the extrusion mechanism is disposed on the first consumable material channel and is configured to drive the consumable material to be transported in the first consumable material channel; The nozzle assembly has a second consumable material channel, the nozzle assembly is fixedly connected to the extrusion assembly, and the second consumable material channel is connected to the first consumable material channel; The tapered hole is configured to be sleeved outside the boss, and when the tapered hole is sleeved outside the boss, there is a movable gap between the tapered hole and the boss so that the pipe head can rotate relative to the boss.

2. The print head module according to claim 1, wherein: The outer peripheral surface of the boss is a tapered surface, and the tapered angle of the tapered surface is smaller than the tapered angle of the tapered hole.

3. The print head module according to claim 2, wherein: The tapered angle of the tapered hole is 5-15° greater than the tapered angle of the tapered surface.

4. The print head module according to claim 1, wherein: The pipe head has a first end surface facing the boss; A first transition fillet is provided at the intersection line between the first end surface and the hole surface of the tapered hole.

5. The print head module according to claim 1, wherein: The pipe head is connected to the pipe fitting via a connecting sleeve; A connecting hole is provided at one end of the pipe head away from the tapered hole. The pipe fitting is inserted into the inner hole of the connecting sleeve. The outer periphery of the connecting sleeve has a sealing structure, and the sealing structure is sealed and connected to the connecting hole.

6. The print head module according to claim 1, wherein: The extrusion assembly further includes a shell, an inlet pipe and an outlet pipe; The shell member encloses an internal space, the inlet pipe is connected to the inlet side of the shell member close to the first consumables channel, and the outlet pipe is connected to the outlet side of the shell member close to the first consumables channel, and the inlet pipe and the outlet pipe are arranged in the shell member with a spaced relationship and define the first consumables channel; The extrusion mechanism extends between the inlet pipe and the outlet pipe, and is used to extrude the passing consumable material from one side of the inlet pipe to the other side of the outlet pipe; the shell includes a top wall close to the inlet side of the first consumable material channel, and the boss protrudes from the top wall toward the outlet side away from the first consumable material channel.

7. The print head module according to claim 6, wherein: The boss has a second end surface facing the tube head, and a second transition fillet is provided at the intersection of the second end surface and the hole surface at the entrance of the first consumable material channel.

8. A print head module connected to an extrusion assembly, wherein the extrusion assembly has a first consumable material channel for conveying consumable materials, characterized in that: The print head module includes: a nozzle assembly, the nozzle assembly comprising a second consumable material channel and a boss, the boss being located at the entrance of the second consumable material channel; A material pipe assembly, the material pipe assembly comprising a pipe fitting and a pipe head; the pipe fitting has an inner passage and is connected to the extrusion assembly and the nozzle assembly; the pipe head has a pipe head hole, one end of which is connected to the inner passage and the other end is configured as a tapered hole; The tapered hole is configured to be sleeved outside the boss, and when the tapered hole is sleeved outside the boss, there is a movable gap between the tapered hole and the boss so that the pipe head can rotate relative to the boss.

9. A 3D printing device, characterized in that: include: an optical axis arranged along the X direction; and Print head module; The print head module includes an extrusion assembly, a nozzle assembly and a material pipe assembly; the material pipe assembly It includes a pipe fitting and a pipe head; the pipe fitting has an inner passage, and the pipe head is connected to the end of the pipe fitting; the pipe head has a pipe head hole, one end of which is connected to the inner passage and the other end is set as a tapered hole; The extrusion assembly includes a first consumable material channel, a boss and an extrusion mechanism, wherein the boss is located at the entrance of the first consumable material channel; the extrusion mechanism is arranged on the first consumable material channel and is configured to drive the consumable material to be transported in the first consumable material channel; the nozzle assembly has a second consumable material channel, the nozzle assembly is fixedly connected to the extrusion assembly, and the second consumable material channel is connected to the first consumable material channel; wherein the tapered hole is configured to be sleeved outside the boss, and when the tapered hole is sleeved outside the boss, there is a movable gap between the tapered hole and the boss, so that the tube head can rotate relative to the boss; The extrusion assembly and the nozzle assembly are slidably connected to the optical axis along the X direction.

10. The 3D printing device according to claim 9, characterized in that: The outer peripheral surface of the boss is a tapered surface, and the tapered angle of the tapered surface is smaller than the tapered angle of the tapered hole.

11. The 3D printing device according to claim 10, characterized in that: The tapered angle of the tapered hole is 5-15° greater than the tapered angle of the tapered surface.

12. The 3D printing device according to claim 9, characterized in that: The pipe head has a first end surface facing the boss; A first transition fillet is provided at the intersection line between the first end surface and the hole surface of the tapered hole.

13. The 3D printing device according to claim 9, wherein: The pipe head is connected to the pipe fitting via a connecting sleeve; A connecting hole is provided at one end of the pipe head away from the tapered hole. The pipe fitting is inserted into the inner hole of the connecting sleeve. The outer periphery of the connecting sleeve has a sealing structure, and the sealing structure is sealed and connected to the connecting hole.

14. The 3D printing device according to claim 9, wherein: The extrusion assembly further includes a shell, an inlet pipe and an outlet pipe; The shell member encloses an internal space, the inlet pipe is connected to the inlet side of the shell member close to the first consumable material channel, and the outlet pipe is connected to the outlet side of the shell member close to the first consumable material channel. The inlet pipe and the outlet pipe are arranged in the shell with a spaced relationship and define the first consumable material channel; The extrusion mechanism extends between the inlet pipe and the outlet pipe, and is used to extrude the passing consumable material from one side of the inlet pipe to the other side of the outlet pipe; the shell includes a top wall close to the inlet side of the first consumable material channel, and the boss protrudes from the top wall toward the outlet side away from the first consumable material channel.

15. The 3D printing device according to claim 14, characterized in that: The boss has a second end surface facing the tube head, and a second transition fillet is provided at the intersection of the second end surface and the hole surface at the entrance of the first consumable material channel.

16. The 3D printing device according to claim 9, characterized in that: Also includes: Base assembly; A printing platform assembly, movably coupled to the base assembly along the Y direction; a gantry connected to the base assembly; Wherein, the optical axis is movably connected to the gantry along the Z direction.

17. The 3D printing device according to claim 16, wherein: The 3D printing device further includes a material rack, which is fixed to the base assembly and is used to carry a material tray.

18. A 3D printing device, characterized in that: include: an optical axis arranged along the X direction; and Extrusion assembly and print head module; The print head module is connected to an extrusion assembly, and the extrusion assembly has a first consumable material channel for conveying consumable materials; The print head module includes a nozzle assembly and a material tube assembly; the nozzle assembly has a second consumable material channel and a boss, and the boss is located at the entrance of the second consumable material channel; the material tube assembly includes a pipe fitting and a pipe head; the pipe fitting has an inner tube channel and is connected to the extrusion assembly and the nozzle assembly; the pipe head has a pipe head channel, one end of the pipe head channel is connected to the inner tube channel, and the other end is set as a tapered hole; wherein the tapered hole is constructed to be sleeved outside the boss, and the tapered hole is sleeved on the convex In the state of being outside the platform, there is a movable gap between the tapered hole and the boss, so that the pipe head can rotate relative to the boss; The extrusion assembly is fixedly arranged relative to the optical axis, the nozzle assembly is slidably connected to the optical axis along the X direction, and the extrusion assembly and the nozzle assembly are connected through a consumable tube.

19. The 3D printing device according to claim 18, characterized in that: Also includes: Base assembly; A printing platform assembly, movably coupled to the base assembly along the Y direction; as well as, a gantry connected to the base assembly; Wherein, the optical axis is movably connected to the gantry along the Z direction.

20. The 3D printing device according to claim 19, wherein: The 3D printing device further includes a material rack, which is fixed to the base assembly and is used to carry a material tray.

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