3D printer extrusion head and 3D printer

Abstract

The utility model provides a kind of 3D printer extrusion head and 3D printer, it is related to 3D printing equipment technical field, including: inner extrusion nozzle and outer extrusion nozzle. Wherein, inner extrusion nozzle front end is equipped with first nozzle section, rear end is assembled in the discharge end of material heating assembly;Outer extrusion nozzle is sleeve-like, at least part is set in the outer periphery of inner extrusion nozzle, and can be moved along the axial direction of inner extrusion nozzle, including: the second nozzle section of front end, and the first connecting cylinder section that is connected with second nozzle section and inner wall at least part is sealed with the outer wall of inner extrusion nozzle Cooperation;Wherein, inner extrusion nozzle can be switched between the following two positions: first position, first nozzle section is located in the barrel cavity of outer extrusion nozzle;Second position, first nozzle section partially extends outside second nozzle section. Like this, it has the advantage that different printing scenarios can be adapted, and flexible use.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing equipment technology, and in particular to a 3D printer extruder and a 3D printer. Background Technology

[0002] As a key component in the molten material forming process, the extrusion head of a 3D printer directly affects printing accuracy, material adaptability, and printing efficiency through its structure and output performance.

[0003] In existing technologies, 3D printers typically use a fixed-structure nozzle with a fixed outlet diameter, which cannot be adjusted according to different material types, printing speeds, or model precision requirements. This fixed-diameter structure has limitations in practical applications: when printing large or rapidly stacking models, a smaller nozzle diameter restricts output efficiency; conversely, when high-precision printing of small details is required, a larger diameter can lead to decreased forming accuracy, or even quality issues such as ink smudging and stringing. Therefore, users often need to manually replace the nozzle when changing printing requirements, which is not only cumbersome but also prone to installation errors and equipment wear.

[0004] Therefore, a 3D printer extruder head and 3D printer that can adapt to different printing scenarios and use flexibility is needed to be designed. Utility Model Content

[0005] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a 3D printer extrusion head and a 3D printer, which solves at least one of the above-mentioned technical problems and has the advantages of being adaptable to different printing scenarios and flexible in use.

[0006] To achieve the above objectives, this utility model provides a 3D printer extruder head, comprising:

[0007] The internal extrusion nozzle has a first nozzle section at the front end and is assembled at the discharge end of the material heating assembly at the rear end;

[0008] The external extrusion nozzle is sleeve-shaped and at least partially sleeved on the outer periphery of the internal extrusion nozzle, and can move along the axial direction of the internal extrusion nozzle. It includes: a second nozzle section at the front end, and a first connecting cylinder section connected to the second nozzle section and whose inner wall at least partially seals against the outer wall of the internal extrusion nozzle.

[0009] The internal extrusion nozzle can be switched between the following two positions:

[0010] In the first position, the first nozzle section is located inside the cylindrical cavity of the external extrusion nozzle;

[0011] In the second position, the first nozzle section extends beyond the second nozzle section.

[0012] Optionally, the outer periphery of the first nozzle section is provided with a plurality of discharge windows. In the second position, the outer wall of the front end of the inner extrusion nozzle is sealed and fitted with the inner wall of the second nozzle section, and the discharge windows are located inside the outer extrusion nozzle cavity.

[0013] Optionally, the discharge window is arranged in a circumferential array along the outer periphery of the first nozzle section.

[0014] Optionally, the outer wall of the inner extrusion nozzle is provided with a first external thread, and the corresponding position of the first connecting cylinder section is provided with an internal thread that engages with the first external thread.

[0015] Optionally, the end of the internal extrusion nozzle away from the first nozzle section is a connecting assembly end, and the outer periphery of the connecting assembly end has a second external thread for threaded connection to the discharge end of the material heating assembly.

[0016] Optionally, the material heating assembly includes: a support block, a heating element, and a power supply line; the discharge end of the support block is threadedly connected to the connection assembly end of the inner extrusion nozzle, the heating element is disposed on the outer periphery of the support block, and the power supply line is electrically connected to the heating element.

[0017] Optionally, a drive motor is provided on one side of the support block; the external extrusion nozzle further includes a second connecting cylinder section, which is connected to the first connecting cylinder section and located at one end away from the second nozzle section, and has gear teeth on its outer periphery; the output shaft of the drive motor is threadedly engaged with the gear teeth through a transmission gear to drive the external extrusion nozzle to rotate.

[0018] Optionally, the inner diameter of the second connecting section of the external extrusion nozzle is larger than the outer diameter of the output end of the support block, and the inner diameter of the first connecting section of the external extrusion nozzle is smaller than the outer diameter of the output end of the support block.

[0019] Optionally, the drive motor is a stepper motor, which is fixed to one side of the support block by a motor bracket. Another aspect of this invention provides a 3D printer, including the 3D printer extruder head described above.

[0020] Compared with the prior art, the advantages of this application are:

[0021] This 3D printer's extruder head is equipped with an external extrusion nozzle that can move axially relative to the internal extrusion nozzle. This allows the first nozzle segment of the internal extrusion nozzle to switch between a first position located within the external extrusion nozzle cavity and a second position partially extending beyond the second nozzle segment. Since the second nozzle segment and the first nozzle segment have different discharge diameters, a large or small diameter can be selected for extrusion according to printing needs, thus balancing printing efficiency and accuracy, adapting to different printing scenarios, and improving operational flexibility. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model, wherein the internal extrusion nozzle is in the first position;

[0024] Figure 2 This is a bottom view of an embodiment of the present invention, in which the internal extrusion nozzle is in the first position;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along line AA in the middle;

[0026] Figure 4 This is a bottom view of an embodiment of the present invention, in which the internal extrusion nozzle is in the second position;

[0027] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the BB line in the middle;

[0028] Figure 6 This is a partial structural exploded view of an embodiment of the utility model.

[0029] Explanation of reference numerals in the attached figures

[0030] 100-3D printer extruder head;

[0031] 1-External extrusion nozzle; 11-Second nozzle section; o1-First extrusion port; 12-First connecting cylinder section; 121-Internal thread; 13-Second connecting cylinder section; 131-Gear tooth; a-Cylinder cavity;

[0032] 2-Internal extrusion nozzle; 21-Connecting assembly end; 221-Second external thread; 22-First nozzle section; o2-Second extrusion port; 23-Discharge window; 24-First external thread;

[0033] 3-Material heating assembly; 31-Support block; o3-Feed inlet; b-Conveying channel; c-Discharge end; 32-Heating element; 33-Power supply line;

[0034] 4-Stepper motor;

[0035] 5- Transmission gears;

[0036] 6-Motor bracket. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "back," "side," and "circumferential" used in this utility model to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used to distinguish multiple parts or structures with the same or similar structures, and do not indicate any special limitation on the arrangement order or connection relationship.

[0039] Please refer to Figures 1 to 6 This utility model embodiment provides a 3D printer extruder head 100, including: an outer extrusion nozzle 1 and an inner extrusion nozzle 2.

[0040] The inner extrusion nozzle 2 has a first nozzle section 22 at its front end, and its rear end is assembled to the discharge end c of the material heating assembly 3. Understandably, the first nozzle section 22 has a second extrusion port o2.

[0041] The outer extrusion nozzle 1 is sleeve-shaped, at least partially fitted around the outer periphery of the inner extrusion nozzle 2, and is movable along the axial direction of the inner extrusion nozzle 2. It includes a second nozzle section 11 and a first connecting cylinder section 12. The second nozzle section 11 is located at the front end of the outer extrusion nozzle 1, and the first connecting cylinder section 12 is connected to the second nozzle section 11, with its inner wall at least partially sealing against the outer wall of the inner extrusion nozzle 2. Understandably, the second nozzle section 11 has a first extrusion port o1.

[0042] The inner extrusion nozzle 2 can be switched between two positions: a first position in which the first nozzle section 22 is located inside the cylinder cavity a of the outer extrusion nozzle 1, and a second position in which the first nozzle section 22 extends out of the second nozzle section 11.

[0043] Because the 3D printer extruder head 100 is equipped with an outer extrusion nozzle 1 that can move axially relative to the inner extrusion nozzle 2, the first nozzle section 22 of the inner extrusion nozzle 2 can switch between a first position located within the cylinder cavity a of the outer extrusion nozzle 1 and a second position partially extending beyond the second nozzle section 11. Since the second nozzle section 11 and the first nozzle section 22 have different discharge diameters, a large or small diameter can be selected for extrusion according to printing needs, thus balancing printing efficiency and accuracy, adapting to different printing scenarios, and improving usage flexibility.

[0044] To ensure the material output speed of the 3D printer extruder 100 when the internal extrusion nozzle 2 is in the first position, and to prevent leakage of the 3D printing material when it is in the second position, optionally, please refer to... Figure 5 and Figure 6 In this embodiment, the outer periphery of the first nozzle section 22 is provided with several discharge windows 23. Thus, when the inner extrusion nozzle 2 is in the first position, the 3D printing material can be extruded into the cavity a of the outer extrusion nozzle 1 through the discharge windows 23 and the second extrusion port o2 of the first nozzle section 22, significantly increasing the speed compared to when it can only be extruded into the cavity a of the outer extrusion nozzle 1 through the second extrusion port o2 of the first nozzle section 22. In the second position, the outer wall of the front end of the inner extrusion nozzle 2 is sealed against the inner wall of the second nozzle section 11, and the discharge windows 23 are located within the cavity a of the outer extrusion nozzle 1. Therefore, when the inner extrusion nozzle 2 is in the second position, because the outer wall of the front end of the inner extrusion nozzle 2 is sealed against the inner wall of the second nozzle section 11, and the discharge windows 23 are located within the cavity a of the outer extrusion nozzle 1, the 3D printing material will not be directly extruded to the outside through the discharge windows 23. This ensures the material output speed of the 3D printer extruder 100, and prevents leakage of the 3D printing material when in the second position.

[0045] To avoid uneven extrusion caused by unilateral or asymmetrical fabric distribution on one side of the discharge window 23 when the internal extrusion nozzle 2 is in the first position, optionally, please refer to... Figure 6 In this embodiment, six discharge windows 23 are arranged in a circumferential array along the outer periphery of the first nozzle segment 22. Of course, in other embodiments, the number of discharge windows 23 is not limited to six; it can be two, three, four, five, seven, or more, as long as they are arranged in a circumferential array along the outer periphery of the first nozzle segment 22. This allows for uniform extrusion of the 3D printing material, which is beneficial to the stability of the model stacking.

[0046] To achieve a tight seal between the external extrusion nozzle 1 and the internal extrusion nozzle 2, and to facilitate control of the axial movement of the internal extrusion nozzle 2 within the external extrusion nozzle 1, thereby adjusting the position of the first nozzle section 22, optionally, please refer to... Figure 3 and Figure 6In this embodiment, the outer wall of the inner extrusion nozzle 2 is provided with a first external thread 24, and the first connecting cylinder section 12 of the outer extrusion nozzle 1 is provided with an internal thread 121 that is threadedly engaged with the first external thread 24 at a corresponding position. Thus, by rotating the outer extrusion nozzle 1, the position of the inner extrusion nozzle 2 relative to the outer extrusion nozzle 1 can be easily adjusted, achieving switching between large and small diameters. Of course, the inner extrusion nozzle 2 can also be slidably disposed with the outer extrusion nozzle 1, and a sealing ring (not shown in the figure) can be added; no specific limitation is made here.

[0047] Alternatively, please refer to Figure 6 In this embodiment, the end of the inner extrusion nozzle 2 away from the first nozzle section 22 is the connecting assembly end 21. The outer periphery of the connecting assembly end 21 has a second external thread 211, which is used to thread it to the discharge end c of the material heating assembly 3.

[0048] Alternatively, please refer to Figure 5 and Figure 6 In this embodiment, the material heating assembly 3 includes a support block 31, a heating element 32, and a power supply line 33. The output end of the support block 31 is threadedly connected to the connection assembly end 21 of the inner extrusion nozzle 2. Understandably, the support block 31 has a feed inlet 3, a feeding channel 32, and a discharge end 32 connected in sequence. The discharge end 32 of the support block 31 is threadedly connected to the connection assembly end 21 of the inner extrusion nozzle 2. The heating element 32 is disposed on the outer periphery of the support block 31. The power supply line 33 is electrically connected to the heating element 32. Thus, 3D printing material can be transported from a material source (not shown in the figure) to the feeding channel 32 of the support block 31 through a tube (not shown in the figure), and after being heated by the heating element 32, it is transported to the inner extrusion nozzle 2 through the discharge end 32.

[0049] To improve the automated adjustment capability of the extruder head during 3D printing and solve the problem of low efficiency caused by the need for manual adjustment of the position of the inner extrusion nozzle 2 relative to the outer extrusion nozzle 1, optionally, please refer to... Figure 1 and Figure 6 In this embodiment, a drive motor is provided on one side of the support block 31. The external extrusion nozzle 1 also includes a second connecting cylinder section 13, which is connected to the first connecting cylinder section 12 and located at the end away from the second nozzle section 11, and has gear teeth 131 on its outer periphery. The output shaft of the drive motor meshes with the gear teeth 131 through a transmission gear 5 to drive the external extrusion nozzle 1 to rotate. In this way, the rotation of the external extrusion nozzle 1 can be driven by the drive motor, thereby driving the internal extrusion nozzle 2 to move axially, realizing the automatic switching of the first nozzle section 22 between a first position and a second position, thereby adapting to the printing requirements of different nozzle diameters or discharge methods.

[0050] To make the structure of the 3D printer extruder head 100 more compact, while limiting the travel of the external extrusion nozzle 1, optionally, please refer to Figure 3 and Figure 5In this embodiment, the inner diameter of the second connecting section 13 of the external extrusion nozzle 1 is larger than the outer diameter of the output end of the support block 31, and the inner diameter of the first connecting section 12 of the external extrusion nozzle 1 is smaller than the outer diameter of the output end of the support block 31. This structural design has two advantages: First, the second connecting section 13 can be partially fitted outside the support block 31 during the up-and-down movement of the external extrusion nozzle 1, thereby saving space and optimizing the overall layout; second, since the inner diameter of the first connecting section 12 is smaller than the outer diameter of the output end of the support block 31, it can form a physical limit during the upward movement, effectively preventing excessive displacement of the external extrusion nozzle 1 and avoiding damage to it and the inner extrusion nozzle 2.

[0051] Alternatively, please refer to Figure 6 In this embodiment, the drive motor is a stepper motor 4, which is fixed to one side of the support block 31 by a motor bracket 6. It is understood that the drive motor is connected to a controller (not shown in the figure), and the movement of the drive motor is driven by the controller's control signals. Specifically, the method by which the controller controls the drive motor is existing technology, and therefore will not be elaborated upon here.

[0052] Another aspect of this utility model embodiment provides a 3D printer (not shown in the figure), including the 3D printer extruder 100 as described above. Since this 3D printer has all the structures and connections of the 3D printer extruder 100, it has all the advantages of the 3D printer extruder 100, which will not be elaborated here.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A 3D printer extruder head, characterized in that, include: The internal extrusion nozzle has a first nozzle section at the front end and is assembled at the discharge end of the material heating assembly at the rear end; The external extrusion nozzle is sleeve-shaped and at least partially sleeved on the outer periphery of the internal extrusion nozzle, and can move along the axial direction of the internal extrusion nozzle. It includes: a second nozzle section at the front end, and a first connecting cylinder section connected to the second nozzle section and whose inner wall at least partially seals against the outer wall of the internal extrusion nozzle. The internal extrusion nozzle can be switched between the following two positions: In the first position, the first nozzle section is located inside the cylindrical cavity of the external extrusion nozzle; In the second position, the first nozzle section extends beyond the second nozzle section.

2. The 3D printer extruder head as described in claim 1, characterized in that, The outer periphery of the first nozzle section is provided with several discharge windows. In the second position, the outer wall of the front end of the inner extrusion nozzle is sealed and fitted with the inner wall of the second nozzle section, and the discharge windows are located inside the outer extrusion nozzle cavity.

3. The 3D printer extruder head as described in claim 2, characterized in that, The discharge window is arranged in a circumferential array along the outer periphery of the first nozzle section.

4. The 3D printer extruder head as described in claim 1, characterized in that, The outer wall of the inner extrusion nozzle is provided with a first external thread, and the corresponding position of the first connecting cylinder section is provided with an internal thread that mates with the first external thread.

5. The 3D printer extruder head as described in claim 4, characterized in that, The end of the inner extrusion nozzle away from the first nozzle section is a connecting assembly end, and the outer periphery of the connecting assembly end has a second external thread for threaded connection to the discharge end of the material heating assembly.

6. The 3D printer extruder head as described in claim 5, characterized in that, The material heating assembly includes: a support block, a heating element, and a power supply line; the discharge end of the support block is threadedly connected to the connection assembly end of the inner extrusion nozzle, the heating element is disposed on the outer periphery of the support block, and the power supply line is electrically connected to the heating element.

7. The 3D printer extruder head as described in claim 6, characterized in that, A drive motor is provided on one side of the support block; the external extrusion nozzle also includes a second connecting cylinder section, which is connected to the first connecting cylinder section and located at one end away from the second nozzle section, and has gear teeth on its outer periphery; the output shaft of the drive motor is threadedly engaged with the gear teeth through a transmission gear to drive the external extrusion nozzle to rotate.

8. The 3D printer extruder head as described in claim 7, characterized in that, The inner diameter of the second connecting section of the external extrusion nozzle is greater than the outer diameter of the output end of the support block, and the inner diameter of the first connecting section of the external extrusion nozzle is smaller than the outer diameter of the output end of the support block.

9. The 3D printer extruder head as described in claim 7, characterized in that, The drive motor is a stepper motor, which is fixed to one side of the support block by a motor bracket.

10. A 3D printer, characterized in that, Includes the 3D printer extruder as described in any one of claims 1-9.

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