A printhead nozzle mechanism and a three-dimensional printer

Abstract

This application provides a printhead nozzle mechanism and a 3D printer, specifically relating to the field of 3D printing technology. The printhead nozzle mechanism includes a heat sink, a nozzle assembly, a first mating portion, and a handle assembly. At least a portion of the nozzle assembly is located within the heat sink. The handle assembly is rotatably connected to the heat sink and includes a second mating portion located on one side of the nozzle assembly. The first mating portion is located between the nozzle assembly and the second mating portion. When the handle assembly is in a first position, the second mating portion disengages from the first mating portion, thereby disengaging the nozzle assembly from the heat sink. When the handle assembly is in a second position, the second mating portion presses against the first mating portion, thereby locking the nozzle assembly to the heat sink. By rotating the handle assembly between the first and second positions, the second mating portion and the first mating portion engage, enabling quick disassembly and reassembly of the nozzle assembly.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more particularly to a printhead nozzle mechanism and a 3D printer. Background Technology

[0002] A 3D printer is a device that uses digital model files as a basis and employs special adhesive materials such as wax, powdered metal, or plastic to create three-dimensional objects by printing layers of this adhesive material. With technological advancements, 3D printers are evolving towards being lighter, thinner, shorter, smaller, and consuming less power.

[0003] Currently, 3D printers are used to manufacture products, employing a layer-by-layer printing technique to construct objects. The principle of a 3D printer is to feed data and materials into the machine, which then builds the product layer by layer according to a program. The print head nozzle mechanism is a key component of the 3D printer, responsible for precisely depositing printing materials (such as plastic filaments and resin) onto the printing platform to form a three-dimensional object.

[0004] However, in existing printhead nozzle mechanisms, clogging, wear, or the need for replacement to accommodate different materials can occur during use, making the nozzle mechanism a regular consumable part of a 3D printer. The nozzle mechanism is prone to clogging due to residual or impurities in the printing material, thus affecting printing efficiency. If the nozzle design does not facilitate quick replacement, the user experience will be impacted. Utility Model Content

[0005] This application provides a printhead nozzle mechanism and a 3D printer. By rotating the handle assembly between a first position and a second position, the second mating part engages with the first mating part, enabling quick disassembly of the nozzle assembly.

[0006] The first aspect of this application provides a printhead nozzle mechanism, including:

[0007] Heat dissipation components;

[0008] A nozzle assembly, at least a portion of which is located within a heat sink;

[0009] A handle assembly is rotatably connected to a heat sink, and the handle assembly includes a second mating part located on one side of the nozzle assembly;

[0010] The first mating part is located between the nozzle assembly and the second mating part;

[0011] When the handle assembly is in the first position, the second mating part disengages from the first mating part, thereby disengaging the nozzle assembly from the heat sink.

[0012] When the handle assembly is in the second position, the second mating part presses against the first mating part to lock the nozzle assembly against the heat sink.

[0013] The printhead nozzle mechanism provided in the first aspect of this application includes a heat sink, a nozzle assembly, a handle assembly, and a first mating portion. At least a portion of the nozzle assembly is located within the heat sink. The handle assembly is rotatably connected to the heat sink and includes a second mating portion located on one side of the nozzle assembly. The first mating portion is located between the nozzle assembly and the second mating portion. When the handle assembly is in a first position, the second mating portion disengages from the first mating portion, thereby disengaging the nozzle assembly from the heat sink. When the handle assembly is in a second position, the second mating portion presses against the first mating portion, thereby locking the nozzle assembly to the heat sink. Thus, by rotating the handle assembly between the first and second positions, the second mating portion and the first mating portion engage, enabling rapid disassembly of the nozzle assembly.

[0014] In one possible implementation, the second mating part is provided with a first concave surface;

[0015] When the handle assembly is in the first position, the first concave surface is disposed opposite to the first mating part, and there is a gap between the first concave surface and the first mating part.

[0016] In one possible implementation, a groove is provided at the position where the nozzle assembly is opposite to the first mating part;

[0017] When the handle assembly is in the second position, the first mating part abuts against the nozzle assembly and is engaged in the groove.

[0018] In one possible implementation, the heat sink has a second concave surface on the side facing the second mating part, the second concave surface is adapted to the outer surface of the second mating part, and the second mating part and the second concave surface are rotatably connected.

[0019] In one possible implementation, it further includes: a spring;

[0020] One end of the spring is fixed to the heat sink, and the other end of the spring is fixed to the second mating part.

[0021] In one possible implementation, the handle assembly further includes: a rotating handle;

[0022] One end of the rotating handle is fixedly connected to the second mating part, and the other end of the rotating handle protrudes from the heat sink.

[0023] The heat sink has a clearance opening, which provides clearance space for rotating the handle.

[0024] In one possible implementation, the first mating part and / or the second mating part are cylindrical structures, and the first mating part and the second mating part are arranged in parallel.

[0025] A second aspect of this application provides a 3D printer, including the printhead nozzle mechanism described above.

[0026] In one possible implementation, the 3D printer further includes: a mounting base;

[0027] The printhead nozzle mechanism is fixedly connected to the mounting base.

[0028] In one possible implementation, the 3D printer further includes a heating base and a heating block, which are detachably connected.

[0029] The heating block is fitted onto the nozzle assembly of the printhead nozzle mechanism, which extends at least a portion of the heat sink of the printhead nozzle mechanism.

[0030] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here.

[0031] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the printhead nozzle mechanism and the 3D printer provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of the printhead nozzle mechanism provided in the embodiments of this application;

[0034] Figure 2 An exploded view of the printhead nozzle mechanism provided in an embodiment of this application;

[0035] Figure 3 A schematic diagram of the printhead nozzle mechanism in the first position according to an embodiment of this application;

[0036] Figure 4 for Figure 3 Schematic diagram of AA section;

[0037] Figure 5 A schematic diagram of the printhead nozzle mechanism in the second position according to an embodiment of this application;

[0038] Figure 6 for Figure 5 Schematic diagram of the BB cross section;

[0039] Figure 7 This is a partial structural schematic diagram of a 3D printer provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100 - Printhead nozzle mechanism;

[0042] 200 - Heat sink; 210 - Second concave surface; 220 - Heat sink fins; 230 - Protrusion; 240 - Relief opening;

[0043] 300 - Nozzle assembly; 310 - Groove;

[0044] 400-First Coordination Unit;

[0045] 500 - Handle assembly; 510 - Second mating part; 511 - First concave surface; 520 - Rotating handle;

[0046] 600-Spring;

[0047] 700 - 3D printer;

[0048] 800 - Fixing base; 810 - Fixing part; 811 - Mounting hole;

[0049] 900 - Heating base; 910 - Heating block. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] As described in the background section, in existing printhead nozzle mechanisms, clogging, wear, or the need for replacement to accommodate different materials may occur during use, making the nozzle mechanism a regular consumable part of a 3D printer. The nozzle mechanism is prone to clogging due to residual or impurities in the printing material, thus affecting printing efficiency. If the nozzle design does not facilitate quick replacement, the user experience will be impacted.

[0052] To address the aforementioned technical problems, a first aspect of this application provides a printhead nozzle mechanism. This printhead nozzle mechanism includes a heat sink, a nozzle assembly, a first mating portion, and a handle assembly. At least a portion of the nozzle assembly is located within the heat sink. The handle assembly is rotatably connected to the heat sink and includes a second mating portion located on one side of the nozzle assembly. The first mating portion is located between the nozzle assembly and the second mating portion. When the handle assembly is in a first position, the second mating portion disengages from the first mating portion, thereby disengaging the nozzle assembly from the heat sink. When the handle assembly is in a second position, the second mating portion presses against the first mating portion, thereby locking the nozzle assembly to the heat sink. Thus, by rotating the handle assembly between the first and second positions, the second mating portion and the first mating portion engage, enabling rapid disassembly of the nozzle assembly.

[0053] A second aspect of this application provides a 3D printer. The 3D printer includes the printhead nozzle mechanism described above.

[0054] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] This application provides a printhead nozzle mechanism and a 3D printer. By rotating the handle assembly between a first position and a second position, the second mating part engages with the first mating part, enabling quick disassembly of the nozzle assembly. The specific structure of the printhead nozzle mechanism and 3D printer provided in this application will be described below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0056] refer to Figure 1 as well as Figure 2 This application provides a printhead nozzle mechanism 100 in a first aspect. The printhead nozzle mechanism 100 may include a heat sink 200, a nozzle assembly 300, a first mating part 400, and a handle assembly 500. In this application embodiment, as... Figure 3As shown, at least a portion of the nozzle assembly 300 may be located within the heat sink 200. Additionally, a first mating portion 400 may be located on one side of the nozzle assembly 300 and within the heat sink 200, thereby enabling the nozzle assembly 300 located within the heat sink 200 to be fixedly connected to the heat sink 200 via the first mating portion 400.

[0057] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, the handle assembly 500 may include a second mating portion 510, which may also be located on one side of the nozzle assembly 300. It is understood that the first mating portion 400 may be located between the nozzle assembly 300 and the second mating portion 510. In the embodiments of this application, as... Figure 3 as well as Figure 4 As shown, the first position can be the position when the handle assembly 500 is in the released state, such as... Figure 5 as well as Figure 6 As shown, the second position can be the position when the handle assembly 500 is in the locked state. In this way, when the handle assembly 500 is in the first position, the second mating part 510 disengages from the first mating part 400, so that the nozzle assembly 300 disengages from the heat sink 200.

[0058] Specifically, when the handle assembly 500 is rotated to the first position, the second mating part 510 can rotate away from the first mating part 400, thereby creating a gap between the first mating part 400 and the second mating part 510 and the nozzle assembly 300, so that the first mating part 400 can disengage from the nozzle assembly 300.

[0059] It is understandable that when the handle assembly is rotated 500 to the first position, such as Figure 4 As shown, there may be a certain gap between the first mating part 400 and the outer side wall of the nozzle assembly 300, so as to enable quick disassembly of the nozzle assembly 300 and facilitate the replacement of the nozzle assembly 300.

[0060] In addition, when the handle assembly 500 is in the second position, the second mating part 510 presses against the first mating part 400 to lock the nozzle assembly 300 to the heat sink 200.

[0061] Specifically, when the handle assembly 500 is rotated to the second position, as follows: Figure 6 As shown, the second mating part 510 can rotate toward the first mating part 400, thereby causing the first mating part 400 to move toward the nozzle assembly 300, and thus causing the first mating part 400 to press and lock onto the nozzle assembly 300.

[0062] Understandably, when the handle assembly 500 is rotated to the second position, the first mating part 400 can fit against the nozzle assembly 300, thereby achieving a locked state of the nozzle assembly 300 and facilitating the fixation of the nozzle assembly 300.

[0063] In one possible implementation, the first mating part 400 and the second mating part 510 can be cylindrical structures. Exemplarily, both the first mating part 400 and the second mating part 510 can be rotating shaft structures; however, this embodiment is not limited to these embodiments. This embodiment exemplifies this by using cylindrical shafts for both the first mating part 400 and the second mating part 510.

[0064] refer to Figure 6 Based on the above embodiments, the side of the second mating portion 510 facing the first mating portion 400 can be a first concave surface 511, which can be adapted to the outer surface of the first mating portion 400. In one possible implementation, at least a portion of the side of the second mating portion 510 facing the first mating portion 400 can be removed, thereby forming a first recess on the side of the second mating portion 510 facing the first mating portion 400, the shape of which is adapted to the shape of the first mating portion 400. It is understood that the side of the first recess facing the first mating portion 400 is the first concave surface 511.

[0065] In the embodiments of this application, such as Figure 4 As shown, when the handle assembly 500 moves to the first position, the second mating part 510 rotates away from the first mating part 400 until the first concave surface 511 of the second mating part 510 and the first mating part 400 are positioned opposite each other, thereby creating a gap between the first concave surface 511 and the first mating part 400. The first mating part 400 is squeezed by the nozzle assembly 300 and disengages from the groove 310 of the nozzle assembly 300, thereby enabling the nozzle assembly 300 to be quickly disassembled from the heat sink 200, facilitating the replacement of the nozzle assembly 300.

[0066] like Figure 6 As shown, when the handle assembly 500 is in the second position, the second mating part 510 rotates toward the first mating part 400, and the first mating part 400 also moves toward the nozzle assembly 300. At this time, the first concave surface 511 abuts against the outer surface of the first mating part 400, pressing the first mating part 400 toward the nozzle assembly 300, so that the first mating part 400 abuts against the nozzle assembly 300, thereby causing the first mating part 400 to be engaged in the groove 310, thereby locking the nozzle assembly 300 onto the heat sink 200.

[0067] Continue to refer to Figure 4 as well as Figure 6Based on the above embodiments, a groove 310 may be formed at the position opposite to the first mating part 400 of the nozzle assembly 300. The groove 310 can be adapted to the outer surface of the first mating part 400. In one possible embodiment, the groove 310 may be formed in the circumferential direction of the nozzle assembly 300, thereby reducing the radial dimension of the part of the nozzle assembly 300 after the groove 310 is formed, and the shape of the groove 310 can be adapted to the shape of the first mating part 400, so that the groove wall of the groove 310 can fit snugly against the first mating part 400.

[0068] In the embodiments of this application, such as Figure 6 As shown, when the handle assembly 500 is in the second position, the second mating part 510 rotates toward the first mating part 400, and the first mating part 400 moves toward the nozzle assembly 300 until the outer surface of the first mating part 400 and the groove wall of the groove 310 are in contact, so that at least a portion of the first mating part 400 is engaged in the groove 310, thereby fixing the nozzle assembly 300 in the heat sink 200 through the first mating part 400.

[0069] Continue to refer to Figure 2 Based on the above embodiments, the heat sink 200 may have a second concave surface 210 on the side facing the second mating portion 510. The second concave surface 210 is adapted to the outer surface of the second mating portion 510, thereby enabling a rotatable connection between the second mating portion 510 and the second concave surface 210. In one possible embodiment, the heat sink 200 forms a second concave portion, and the shapes of the second concave portion and the second mating portion 510 are adapted to each other. It is understood that the side of the second concave portion facing the second mating portion 510 is the second concave surface 210. In this way, by the engagement of the second concave surface 210 and the outer surface of the second mating portion 510, the second concave surface 210 provides support and stability for the second mating portion 510.

[0070] Continue to refer to Figure 2 Based on the above embodiments, the printhead nozzle assembly 300 may further include a spring 600. In one possible implementation, one end of the spring 600 may be fixed to the heat sink 200, while the other end may be fixed to the second mating portion 510, allowing the spring 600 to wrap around the second mating portion 510. It is understood that the spring 600 provides a certain elastic force to the handle assembly 500. When the handle assembly 500 is in the second position, the elastic force keeps the handle assembly 500 locked, ensuring that the second mating portion 510, the first mating portion 400, and the groove wall of the groove 310 remain in contact, preventing the nozzle assembly 300 from loosening during movement.

[0071] Continue to refer to Figure 4 as well as Figure 6 Based on the above embodiments, the handle assembly 500 may further include a rotating handle 520. One end of the rotating handle 520 may be fixedly connected to the second mating part 510, while the other end of the rotating handle 520 may protrude from the heat sink 200. It is understood that the user can operate the rotating handle 520 to achieve the loosened and locked states of the handle assembly 500.

[0072] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, both the first mating part 400 and the second mating part 510 can be a rotating shaft structure, and the first mating part 400 and the second mating part 510 can be arranged in parallel. It is understood that in this embodiment, the radial dimension of the second mating part 510 can be greater than or equal to the radial dimension of the first mating part 400, thereby facilitating the second mating part 510 to press against the first mating part 400 in the second position, thereby achieving the locking of the nozzle assembly 300.

[0073] Continue to refer to Figure 2 Based on the above embodiments, the heat sink 200 may have heat dissipation fins 220. In one possible implementation, the number of heat dissipation fins 220 can be several; however, this application embodiment does not limit the number of heat dissipation fins 220. In this application embodiment, several heat dissipation fins 220 are parallel and spaced apart on the heat sink 200. It is understood that the heat dissipation fins 220 improve heat dissipation efficiency by increasing the surface area in contact with the surrounding air, thereby improving the reliability and service life of the heat sink 200.

[0074] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, the heat sink 200 may be provided with a clearance opening 240. It is understood that the clearance opening 240 can provide clearance space for the rotation of the handle 520.

[0075] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, the size of the heat dissipation fins 220 near the second mating part 510 can be less than or equal to the size of the heat dissipation fins 220 away from the second mating part 510, so that the positions of the plurality of heat dissipation fins 220 opposite to the rotating handle 520 can be arranged in an inclined manner. In this way, a clearance opening 240 can be formed at the positions of the plurality of heat dissipation fins 220 opposite to the rotating handle 520, thereby providing clearance space for the rotating handle 520 to rotate, facilitating the rotation of the rotating handle 520.

[0076] refer to Figure 7In a second aspect, this application provides a 3D printer 700. The 3D printer 700 may include the printhead nozzle mechanism 100 described above.

[0077] Continue to refer to Figure 7 Based on the above embodiments, the 3D printer 700 may further include a mounting base 800. The printhead nozzle mechanism 100 may be fixedly connected to the mounting base 800.

[0078] Continue to refer to Figure 7 Based on the above embodiments, the fixing base 800 may further include a fixing part 810, which can be fixed to the fixing base 800. In one possible implementation, combined with... Figure 2 The fixing part 810 may have at least two mounting holes 811, and the heat sink 200 in the printhead nozzle mechanism 100 may have at least two protrusions 230 on the side facing the fixing part 810. In this embodiment, the number of mounting holes 811 and protrusions 230 is not limited. In this embodiment, two mounting holes 811 and two protrusions 230 are used as examples. The two protrusions 230 and two mounting holes 811 can be arranged opposite each other, and the protrusions 230 can be inserted into the mounting holes 811, thereby enabling the heat sink 200 to be fixedly connected to the printhead nozzle mechanism 100 and the fixing part 810 through the cooperation between the protrusions 230 and the mounting holes 811. This facilitates the installation and disassembly of the printhead nozzle mechanism 100.

[0079] Continue to refer to Figure 7 Based on the above embodiments, the 3D printer 700 may further include a heating base 900 and a heating block 910. The heating base 900 and the heating block 910 are detachably connected. In one possible implementation, the heating base 900 may be a heating power supply terminal, while the heating block 910 may include a heating element. The heating base 900 and the heating block 910 may be magnetically or snap-fit ​​connected; this embodiment is not limited thereto. In another optional implementation, the heating base 900 includes a heating element, and the heat generated by the heating element is transferred to the nozzle assembly 300 through the heating block 910; the heating base 900 and the heating block 910 may be magnetically or snap-fit ​​connected; this embodiment is not limited thereto.

[0080] Continue to refer to Figure 7 Based on the above embodiments, combined with Figure 1As can be seen, a portion of the nozzle assembly 300 of the printhead nozzle mechanism 100 is located within the heat sink 200, while another portion extends beyond the heat sink 200. It is understood that the heating block 910 can be fitted onto at least the portion of the nozzle assembly 300 extending beyond the heat sink 200, so that the heating seat 900 can be heated by the heating block 910 and heat can be transferred to the printhead nozzle mechanism 100 through the heating block 910.

[0081] In this embodiment of the application, the printhead nozzle mechanism 100 provided in this embodiment of the application can switch between a first position and a second position by rotating the handle assembly 500, so that the second mating part 510 and the first mating part 400 can be mated, thereby realizing the quick disassembly of the nozzle assembly 300.

[0082] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0083] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0084] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0085] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0086] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0087] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A printhead nozzle mechanism, characterized by, include: Heat sink (200); A nozzle assembly (300), at least a portion of which is located within the heat sink (200); A handle assembly (500) is rotatably connected to the heat sink (200), and the handle assembly (500) includes a second mating part (510) located on one side of the nozzle assembly (300); A first mating part (400) is located between the nozzle assembly (300) and the second mating part (510); When the handle assembly (500) is in the first position, the second mating part (510) disengages from the first mating part (400) so that the nozzle assembly (300) disengages from the heat sink (200). When the handle assembly (500) is in the second position, the second mating part (510) presses against the first mating part (400) to lock the nozzle assembly (300) onto the heat sink (200).

2. The printhead nozzle mechanism of claim 1, wherein, The second mating part (510) is provided with a first concave surface (511); When the handle assembly (500) is in the first position, the first concave surface (511) is disposed opposite to the first mating part (400), and there is a gap between the first concave surface (511) and the first mating part (400).

3. The printhead nozzle mechanism of claim 2, wherein, The nozzle assembly (300) has a groove (310) at the position opposite to the first mating part (400); When the handle assembly (500) is in the second position, the first mating part (400) abuts against the nozzle assembly (300), and the first mating part (400) engages in the groove (310).

4. The printhead nozzle mechanism of claim 3, wherein, The heat sink (200) has a second concave surface (210) on one side facing the second mating part (510). The second concave surface (210) is adapted to the outer surface of the second mating part (510), and the second mating part (510) and the second concave surface (210) are rotatably connected.

5. The printhead nozzle mechanism of any of claims 1-4, wherein, Also includes: Spring (600); One end of the spring (600) is fixed to the heat sink (200), and the other end of the spring (600) is fixed to the second mating part (510).

6. The printhead nozzle mechanism according to any one of claims 1-4, characterized in that, The handle assembly (500) further includes: a rotating handle (520); One end of the rotating handle (520) is fixedly connected to the second mating part (510), and the other end of the rotating handle (520) protrudes from the heat sink (200). The heat sink (200) is provided with a clearance opening (240), which provides clearance space for the rotating handle (520) to rotate.

7. The printhead nozzle mechanism of any of claims 1-4, wherein, The first mating part (400) and / or the second mating part (510) are cylindrical structures, and the first mating part (400) and the second mating part (510) are arranged in parallel.

8. A three-dimensional printer, characterized by Includes the printhead nozzle mechanism (100) as described in any one of claims 1-7 above.

9. The three-dimensional printer of claim 8, wherein, The 3D printer (700) also includes: a mounting base (800); The printhead nozzle mechanism (100) is fixedly connected to the mounting base (800).

10. The three-dimensional printer of claim 9, wherein, The 3D printer also includes a heating base (900) and a heating block (910), wherein the heating base (900) and the heating block (910) are detachably connected; The heating block (910) is fitted onto the nozzle assembly (300) of the printhead nozzle mechanism (100) and extends at least a portion of the heat sink (200) of the printhead nozzle mechanism (100).

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