Printing head assembly and three-dimensional printer

Abstract

The utility model relates to the field of three-dimensional printing, in particular to a printing head assembly and a three-dimensional printer. The second connecting body and the first connecting body are sequentially arranged in a spaced mode in the discharging direction of the printing head assembly and are fixedly connected; the heating body is limited between the first connecting body and the second connecting body; the nozzle penetrates through the first connecting body, the heating body and the second connecting body and is detachably fixed on the second connecting body; wherein the heating body is used for hot melting of consumables passing through the nozzle. The heat exchanger is convenient to assemble and disassemble, heat conduction efficiency can be effectively improved, and therefore the requirement for larger flow is met.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and in particular to a print head assembly and a 3D printer. Background Art

[0002] The nozzles of existing 3D printers are generally fixed with threads. When the nozzle is clogged, tools are needed to disassemble, clean, and reinstall it. Severely clogged nozzles may even need to be replaced. Therefore, the convenience of nozzle disassembly and installation is very important.

[0003] In the related art, in order to save the step of removing the screws, the nozzle and the heating block are first assembled into one, and then the assembled nozzle and heating block are fixed to the nozzle by means of a clamp. The heating block and the heating element are only fitted on the surface. This solution will make it difficult for the heat generated by the heating element to be fully and effectively transferred to the nozzle through the heating block, and the heat conduction efficiency of the heating block is too low, which will make it impossible to quickly and effectively melt the consumables, thereby causing the problem of insufficient nozzle flow. Utility Model Content

[0004] The embodiments of the present application provide a print head assembly and a 3D printer, which are not only easy to disassemble but also can improve heat conduction efficiency.

[0005] In a first aspect, the print head assembly provided by the embodiments of the present application includes:

[0006] a first connector;

[0007] a second connecting body, the second connecting body and the first connecting body being sequentially spaced apart and fixedly connected along a discharge direction of the print head assembly;

[0008] a heating body confined between the first connecting body and the second connecting body; and

[0009] a nozzle, which is provided through the first connecting body, the heating body and the second connecting body, and is detachably fixed to the second connecting body;

[0010] Wherein, the heating body is used to heat-melt the consumables passing through the nozzle.

[0011] In some embodiments, the nozzle has a feeding end and a discharging end sequentially arranged along the discharging direction, and the feeding end of the nozzle sequentially passes through the first connector, the heating body, and the second connector.

[0012] In some embodiments, the nozzle is threadably connected to the second connector.

[0013] In some embodiments, the first connector is provided with a first assembly hole that cooperates with the nozzle and a first countersunk hole that cooperates with the heater, the second connector is provided with a second assembly hole that cooperates with the nozzle and a second countersunk hole that cooperates with the heater, and the first assembly hole, the second assembly hole, the first countersunk hole, and the second countersunk hole are coaxially arranged;

[0014] One end portion of the heating body is confined within the first countersunk hole, and the other end portion of the heating body is confined within the second countersunk hole.

[0015] In some embodiments, there is a gap between the outer surface of the heating body and the hole wall of the first sink hole, and there is a gap between the outer surface of the heating body and the hole wall of the second sink hole.

[0016] In some embodiments, the first connector has a first limiting surface perpendicular to the discharge direction, and the first assembly hole is formed on the first limiting surface and communicates with the first sink hole along the discharge direction;

[0017] The second connector has a second limiting surface perpendicular to the discharge direction, and the second assembly hole is formed on the second limiting surface and communicates with the second sink hole along the discharge direction;

[0018] The nozzle has a first step surface and a second step surface spaced apart in the discharge direction;

[0019] Wherein, the first step surface abuts against the first limiting surface, and / or the second step surface abuts against the second limiting surface.

[0020] In some embodiments, the heating body has a heating hole that passes through the heating body along the discharge direction;

[0021] The nozzle is inserted into the heating hole, and the outer surface of the nozzle is in direct contact with the hole wall of the heating hole.

[0022] In some embodiments, the print head assembly further includes a fastening body configured to fixedly connect the first connecting body and the second connecting body.

[0023] In some embodiments, the print head assembly includes two fastening bodies, and the two fastening bodies are arranged in axisymmetry with respect to the axis of the nozzle.

[0024] In some embodiments, the first connector has a third limiting surface perpendicular to the discharging direction and a third assembly hole formed on the third limiting surface and passing through the first connector along the discharging direction;

[0025] The second connector has a fourth limiting surface arranged perpendicular to the discharging direction and a fourth assembly hole opened on the fourth limiting surface and passing through the second connector along the discharging direction;

[0026] The fastening body has a third step surface and a fourth step surface spaced apart in the discharge direction;

[0027] The fastening body is configured to be connected to the third assembly hole and the fourth assembly hole, and the third step surface abuts against the third limiting surface, and the fourth step surface abuts against the fourth limiting surface.

[0028] In some embodiments, the print head assembly further includes a cylindrical limiting body, which is sleeved outside the fastening body, and the limiting body abuts between the first connecting body and the second connecting body.

[0029] In a second aspect, the 3D printer provided in an embodiment of the present application includes the print head assembly provided in any of the above embodiments.

[0030] Compared with the prior art, the beneficial features of the embodiments of the present application are: the print head assembly and the three-dimensional printer, the second connector and the first connector are arranged in sequence along the discharge direction of the print head assembly and are fixedly connected, the heating body is confined between the first connector and the second connector, the nozzle is passed through the first connector, the heating body and the second connector, and the nozzle is detachably fixed to the second connector. Through the implementation of the present application, the nozzle is fixed on the second connector, which can avoid deformation of the assembly structure on the nozzle due to heat, and is convenient for loading and unloading. Moreover, the nozzle is directly passed through the heating body, which can effectively improve the heat conduction efficiency, thereby meeting greater flow requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a three-dimensional schematic diagram of a print head assembly according to an embodiment of the present application;

[0032] Figure 2 for Figure 1 A schematic front view of a print head assembly is shown;

[0033] Figure 3 for Figure 2 AA cross-sectional view;

[0034] Figure 4 for Figure 1 An exploded schematic diagram of the print head assembly is shown;

[0035] Figure 5 for Figure 4 Schematic diagram from another perspective;

[0036] Figure 6 for Figure 4Schematic diagram of local B explosion;

[0037] Figure 7 for Figure 6 Schematic diagram from another perspective;

[0038] Among them: 1-first connector (101-first assembly hole, 102-first sink hole (1021-hole wall of the first sink hole, 1022-bottom surface of the first sink hole), 103-third limiting surface, 104-third assembly hole, 105-first limiting surface), 2-second connector (201-second assembly hole, 202-second sink hole (2021-hole wall of the second sink hole, 2022-bottom surface of the second sink hole), 203-fourth Limiting surface, 204-fourth assembly hole), 3-heating body (301-outer surface of the heating body, 302-lower end surface of the heating body, 303-upper end surface of the heating body, 304-heating hole), 4-nozzle (4a-feeding end, 4b-discharging end, 401-first step surface, 402-second step surface, 403-outer surface of the nozzle), 5-fastening body (501-third step surface, 502-fourth step surface), 6-limiting body. DETAILED DESCRIPTION

[0039] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0040] 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 be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0042] Please refer to Figures 1 to 7The print head assembly of the embodiment of the present application includes a first connector 1, a second connector 2, a heater 3 and a nozzle 4. The second connector 2 and the first connector 1 are arranged in sequence along the discharge direction of the print head assembly, and the second connector 2 and the first connector 1 are fixedly connected. The heater 3 is confined between the first connector 1 and the second connector 2. The nozzle 4 is provided through the first connector 1, the heater 3 and the second connector 2, and the nozzle 4 is detachably fixed to the second connector 2. The heater 3 is used to hot-melt the consumables passing through the nozzle 4.

[0043] In the embodiment of the present application, the second connector 2 and the first connector 1 are sequentially spaced and fixedly connected along the discharge direction of the printhead assembly. The heater 3 is confined between the first connector 1 and the second connector 2. The nozzle 4 is disposed through the first connector 1, the heater 3, and the second connector 2, and is detachably fixed to the second connector 2. Since the second connector 2, the heater 3, and the first connector 1 are sequentially disposed along the discharge direction of the printhead assembly, fixing the nozzle 4 to the second connector 2, as opposed to fixing the nozzle 4 to the first connector 1, can minimize the impact of the heater 3 on the assembly structure of the nozzle 4, minimize the temperature of the assembly structure of the nozzle 4, and thus prevent deformation of the assembly structure of the nozzle 4 due to heat. The nozzle 4 can be removed without the use of tools, facilitating assembly and disassembly. Moreover, since the nozzle 4 is directly disposed through the heater 3, the heat generated by the heater 3 can be directly transferred to the nozzle 4 without the need for a heater block or other structure to transfer heat. This effectively improves heat transfer efficiency, thereby more fully, effectively, and quickly melting the consumables passing through the nozzle 4, meeting greater flow requirements.

[0044] As an example, the heating body 3 can be used to heat the consumable material passing through the nozzle 4 to a molten state.

[0045] In some preferred embodiments, please refer to Figure 1 and Figure 3 As shown, the nozzle 4 has a feed end 4a and a discharge end 4b arranged in sequence along the discharge direction. As an example, the consumables enter the nozzle 4 from the feed end 4a of the nozzle 4, are heated by the heat generated by the heating body 3 inside the nozzle 4, and are then discharged from the discharge end 4b of the nozzle 4 to the outside of the nozzle 4.

[0046] In some more preferred embodiments, the feed end 4a of the nozzle 4 sequentially passes through the first connector 1, the heater 3, and the second connector 2. That is, during assembly, the nozzle 4 sequentially passes through the first connector 1, the heater 3, and the second connector 2 in the opposite direction of the discharge direction and is fixed to the second connector 2. This can prevent the discharge end 4b of the nozzle 4 from being scratched by the first connector 1, the heater 3, or the second connector 2, thereby preventing damage and deformation of the nozzle 4. This can effectively improve the service life of the nozzle 4 and the printing quality.

[0047] It should be noted that, in other embodiments, during assembly, the nozzle 4 may also sequentially pass through the second connector 2, the heating body 3 and the first connector 1 along the discharge direction, which will not be elaborated herein.

[0048] In some preferred embodiments, the nozzle 4 is threadedly connected to the second connector 2. In other words, the assembly structure of the nozzle 4 can be an external threaded structure formed on the nozzle 4, and the second connector 2 can be provided with a threaded hole. The assembly structure of the nozzle 4 is threadedly connected to the threaded hole of the second connector 2, which is not only convenient for installation but also for disassembly, and has a simple structure and is easy to process and manufacture.

[0049] It can be understood that in other embodiments, the nozzle 4 can be detachably connected to the second connector 2 in other ways, that is, the assembly structure of the above-mentioned nozzle 4 can be set to other structures, and accordingly, a matching structure detachably connected to the assembly structure can be set on the second connector 2, which will not be elaborated here.

[0050] In some preferred embodiments, the first connector 1 is provided with a coaxially arranged first assembly hole 101 and a first countersunk hole 102. The first assembly hole 101 cooperates with the nozzle 4, the nozzle 4 is passed through the first assembly hole 101 of the first connector 1, and the first countersunk hole 102 cooperates with the heating body 3. The second connector 2 is provided with a second assembly hole 201 and a second countersunk hole 202. The second assembly hole 201 cooperates with the nozzle 4, the nozzle 4 is passed through the second assembly hole 201 of the second connector 2, and the second countersunk hole 202 cooperates with the heating body 3. When the first connector 1 and the second connector 2 are fixed into one, that is, after the first connector 1 and the second connector 2 are assembled together, the first assembly hole 101, the second assembly hole 201, the first countersunk hole 102 and the second countersunk hole 202 are coaxially arranged. Among them, one end of the heating body 3 is restricted in the first sink hole 102, and the other end of the heating body 3 is restricted in the second sink hole 202. That is to say, the first sink hole 102 and the second sink hole 202 cooperate with each other to restrict the heating body 3 between the first connector 1 and the second connector 2.

[0051] As an example, when the nozzle 4 is threadedly connected to the second connector 2, that is, when the assembly structure of the nozzle 4 is an external thread structure formed on the nozzle 4, the second assembly hole 201 is constructed as a threaded hole, and in order to facilitate the nozzle 4 to pass through the first connector 1 and avoid scratching the nozzle 4 in the process of passing through the first connector 1, the first assembly hole 101 can be a smooth hole.

[0052] In some more preferred embodiments, please refer to Figure 3As shown, there is a gap between the outer surface 301 of the heating body 3 and the hole wall 1021 of the first countersunk hole 102, and there is a gap between the outer surface 301 of the heating body 3 and the hole wall 2021 of the second countersunk hole 202, which can effectively prevent the heating body 3 from being crushed by the first connecting body 1 or the second connecting body 2, thereby improving the service life of the print head assembly and product quality.

[0053] In some examples, the heating element 3 is a cylindrical structure, please refer to Figure 3 、 Figure 6 and Figure 7 As shown, the cylindrical wall thickness of the heater 3 is relatively thin relative to the diameter of the through hole in the middle of the heater 3. Therefore, the cylindrical heater 3 is more easily crushed than a solid structure. In this embodiment, in order to solve this problem, a gap is provided between the outer surface 301 of the heater 3 and the hole wall 1021 of the first countersunk hole 102, and a gap is provided between the outer surface 301 of the heater 3 and the hole wall 2021 of the second countersunk hole 202. This can effectively prevent the heater 3 from being crushed by the first connector 1 or the second connector 2, thereby improving the service life of the print head assembly and the product quality.

[0054] As an optional embodiment, during assembly, the first connector 1, the heating body 3 and the second connector 2 are first fixed into a whole, and then the nozzle 4 is assembled to the above-mentioned whole to form a print head assembly. Before the nozzle 4 is assembled to the above-mentioned whole, since there is a gap between the outer surface 301 of the heating body 3 and the hole wall 1021 of the first countersunk hole 102 and the hole wall 2021 of the second countersunk hole 202, the heating body 3 can move within a limited range relative to the first connector 1 and the second connector 2. As an example, the heating body 3 can at least move within a limited range perpendicular to the discharge direction relative to the first connector 1 and the second connector 2, but after the nozzle 4 is assembled to the above-mentioned whole, the outer surface 403 of the nozzle 4 is in direct contact with the heating body 3, thereby limiting the movement of the heating body 3, please refer to Figure 3 This embodiment not only reduces the difficulty of assembly and avoids assembly failure due to extreme tolerances, but also effectively protects the heating body 3 and prevents the heating body 3 from being crushed by the first connector 1 or the second connector 2. At the same time, the outer surface 403 of the nozzle 4 is in direct contact with the heating body 3, which can maximize the heat conduction efficiency.

[0055] In some embodiments, the distance between the bottom surface 1022 of the first countersunk hole 102 and the bottom surface 2022 of the second countersunk hole 202 is greater than the length of the heating body 3 in the discharge direction. Figure 3As shown, that is, the end surface of the heating body 3 only abuts against one of the bottom surface 1022 of the first countersunk hole 102 and the bottom surface 2022 of the second countersunk hole 202, thereby further protecting the heating body 3 and further reducing the risk of the heating body 3 being crushed.

[0056] As an example, please refer to Figure 3 As shown, the discharge direction is downward. Under the action of gravity, the lower end surface 302 of the heating body 3 abuts against the bottom surface 1022 of the first sink hole 102, and there is a gap between the upper end surface 303 of the heating body 3 and the bottom surface 2022 of the second sink hole 202, thereby further reducing the risk of the heating body 3 being crushed by the first connector 1 and the second connector 2.

[0057] It should be noted that, in other embodiments, the lower end surface 302 of the heating body 3 abuts against the bottom surface 1022 of the first countersunk hole 102, while the upper end surface 303 of the heating body 3 abuts against the bottom surface 2022 of the second countersunk hole 202, thereby further improving the assembly accuracy and better restraining the heating body 3. The assembly gap between the heating body 3 and the first connector 1 and the second connector 2 can be set according to actual conditions and will not be elaborated here.

[0058] In some more preferred embodiments, please refer to Figure 3 and Figure 7 As shown, the first connector 1 has a first limiting surface 105, which is arranged perpendicular to the discharge direction, and the first assembly hole 101 is opened on the first limiting surface 105 and is connected with the first countersunk hole 102 along the discharge direction. The second connector 2 has a second limiting surface, which is arranged perpendicular to the discharge direction, and the second assembly hole 201 is opened on the second limiting surface and is connected with the second countersunk hole 202 along the discharge direction. Correspondingly, the nozzle 4 has a first step surface 401 and a second step surface 402 spaced apart in the discharge direction, the first step surface 401 is arranged corresponding to the first limiting surface 105, and the second step surface 402 is arranged corresponding to the second limiting surface. Among them, the first step surface 401 abuts against the first limiting surface 105, and / or the second step surface 402 abuts against the second limiting surface. That is, at least one of the first step surface 401 and the second step surface 402 abuts against the corresponding limiting surface, thereby limiting the relative position of the nozzle 4 and the first connecting body 1 and the second connecting body 2, thereby improving assembly accuracy.

[0059] As an example, please refer to Figure 3 and Figure 7 As shown, the second limiting surface can be the bottom surface 2022 of the second countersunk hole 202, thereby simplifying the structure, not only facilitating assembly but also facilitating production and manufacturing.

[0060] In some examples, the print head assembly is mainly installed on the 3D printer through the second connector 2. In addition to the nozzle 4 being connected to the feed assembly of the 3D printer for conveying consumables, the second connector 2 is also directly fixed to the 3D printer. As an example, the heat sink of the 3D printer can be provided with a feed hole connected to the nozzle 4, or the heat sink can be provided with a through hole suitable for the feed assembly to pass through. The second connector 2 can be connected to the heat sink of the 3D printer by screws, thereby fixing the print head assembly to the 3D printer. Therefore, if the assembly accuracy of the nozzle 4 and the second connector 2 is low, it will also affect the coordination between the print head assembly and the 3D printer. The present application effectively limits the relative position of the nozzle 4 and the first connector 1 and the second connector 2, thereby improving the assembly accuracy.

[0061] It is understandable that in other embodiments, the print head assembly may also be connected to the 3D printer in other ways, which is not limited here.

[0062] In some preferred embodiments, the heater 3 is provided with a heating hole 304 extending through the heater 3 in the discharge direction. The nozzle 4 is disposed within the heating hole 304, and the outer surface 403 of the nozzle 4 is in direct contact with the wall of the heating hole 304. This allows the heat generated by the heater 3 to be directly transferred to the nozzle 4, thereby heating the consumables passing through the nozzle 4. This further improves the heat transfer efficiency and makes the print head assembly suitable for high-speed printing scenarios.

[0063] It should be noted that, in other embodiments, there may also be a gap between the outer surface 403 of the nozzle 4 and the hole wall of the heating hole 304, which can be set according to actual conditions and will not be elaborated here.

[0064] In some preferred embodiments, please refer to Figure 1 as well as Figures 3 to 7 The print head assembly further includes a fastening body 5. The fastening body 5 is used to securely connect the first connecting body 1 and the second connecting body 2, thereby limiting the distance between the first connecting body 1 and the second connecting body 2, and more effectively protecting the heating body 3 from being crushed.

[0065] In some more preferred embodiments, please refer to Figure 1 as well as Figures 3 to 7 The print head assembly includes two fastening bodies 5, which are axially symmetrically arranged about the axis of the nozzle 4, which not only facilitates assembly, but also makes the force on the first connector 1 and the second connector 2 more uniform, and can also more effectively confine the heating body 3 between the first connector 1 and the second connector 2, thereby improving the assembly accuracy and assembly reliability.

[0066] It should be noted that, in other embodiments, the print head assembly may include one or three or more fastening bodies 5, which can be configured according to actual needs and will not be described in detail here.

[0067] In some more preferred embodiments, please refer to Figure 3 and Figure 7 The first connector 1 has a third limiting surface 103 and a third assembly hole 104. The third limiting surface 103 is perpendicular to the discharge direction. The third assembly hole 104 is opened on the third limiting surface 103 and passes through the first connector 1 along the discharge direction. Figure 3 and Figure 7 The second connector 2 has a fourth limiting surface 203 and a fourth assembly hole 204. The fourth limiting surface 203 is perpendicular to the discharge direction. The fourth assembly hole 204 is opened on the fourth limiting surface 203 and passes through the second connector 2 along the discharge direction. Figure 3 and Figure 6 The fastening body 5 has a third step surface 501 and a fourth step surface 502 spaced apart in the discharge direction. One end of the fastening body 5 is connected to the third assembly hole 104, and the other end of the fastening body 5 is connected to the fourth assembly hole 204. When the fastening body 5 is assembled with the first connector 1 and the second connector 2, the third step surface 501 abuts against the third limiting surface 103, and the fourth step surface 502 abuts against the fourth limiting surface 203, thereby further limiting the distance between the first connector 1 and the second connector 2, thereby more effectively protecting the heating body 3 and preventing the heating body 3 from being crushed by the first connector 1 and the second connector 2.

[0068] As an example, the third assembly hole 104 may be a plain hole, and the fourth assembly hole 204 may be a threaded hole. During assembly, the fastener 5 passes through the third assembly hole 104 in the opposite direction of the discharge direction and is threadedly connected to the fourth assembly hole 204.

[0069] It is understood that in other embodiments, the third assembly hole 104 may be a threaded hole, and the fourth assembly hole 204 may be a plain hole. During assembly, the fastener 5 passes through the fourth assembly hole 204 along the discharge direction and is threadedly connected to the third assembly hole 104. Alternatively, the fastener 5 may be mated with the first connector 1 and the second connector 2 in other ways, which will not be described in detail here.

[0070] In some embodiments, the first connector 1 has a first limiting surface 105 and a third limiting surface 103, the second connector 2 has a second limiting surface and a fourth limiting surface 203, the nozzle 4 has a first step surface 401 and a second step surface 402, and the fastening body 5 has a third step surface 501 and a fourth step surface 502.

[0071] As an optional embodiment, during assembly, the first connecting body 1, the heating body 3 and the second connecting body 2 are first fixed into a whole by the fastening body 5, and then the nozzle 4 is assembled to the above-mentioned whole to form a print head assembly. After assembly, the third step surface 501 of the fastening body 5 abuts against the third limiting surface 103, the fourth step surface 502 of the fastening body 5 abuts against the fourth limiting surface 203, and only one of the first step surface 401 and the second step surface 402 of the nozzle 4 abuts against the corresponding limiting surface. There is a gap between the other step surface of the nozzle 4 and the corresponding limiting surface. Please refer to Figure 3 , thereby avoiding assembly interference and improving assembly accuracy. For example, please refer to Figure 3 After being assembled, there is a certain gap between the second step surface 402 of the nozzle 4 and the second limiting surface of the second connector 2, and the first step surface 401 of the nozzle 4 abuts against the first limiting surface 105 of the first connector 1. Figure 3 It can be seen that the second limiting surface is located within the overall structure composed of the first connector 1, the heating element 3, and the second connector 2, while the first limiting surface 105 is exposed outside the overall structure. A certain gap exists between the second stepped surface 402 of the nozzle 4 and the second limiting surface of the second connector 2. This effectively avoids problems such as machining errors or tolerances that may cause a gap between the first stepped surface 401 of the nozzle 4 and the first limiting surface 105 of the first connector 1. In other words, the first stepped surface 401 of the nozzle 4 cannot abut against the first limiting surface 105 of the first connector 1. The installer can determine whether the nozzle 4 is properly assembled with the overall structure by observing whether the first stepped surface 401 of the nozzle 4 abuts against the first limiting surface 105 of the first connector 1. This is more intuitive, reduces assembly difficulty, and improves assembly accuracy.

[0072] It should be noted that the above embodiment is only an optional embodiment, and the matching relationship between the step surface and the limiting surface on each structure can be set according to actual conditions, which will not be elaborated here.

[0073] In some more preferred embodiments, please refer to Figures 1 to 7 The print head assembly further includes a cylindrical stopper 6, which is sleeved outside the fastening body 5 and abuts between the first connector 1 and the second connector 2. The stopper 6 abuts between the first connector 1 and the second connector 2, further limiting the distance between the first connector 1 and the second connector 2, and effectively protecting the fastening body 5, thereby increasing the service life of the fastening body 5 and the assembly accuracy of the first connector 1 and the second connector 2.

[0074] As an example, reference can be made to the matching relationship between the above-mentioned four step surfaces and the corresponding limiting surfaces. When the two end portions of the limiting body 6 are respectively abutted against the first connecting body 1 and the second connecting body 2, the third step surface 501 and the fourth step surface 502 of the fastening body 5 can be respectively abutted against the third limiting surface 103 and the fourth limiting surface 203, or, only one of the step surfaces of the fastening body 5 is abutted against the corresponding limiting surface, and there is a gap between the other step surface of the fastening body 5 and the corresponding limiting surface, which can be set according to actual conditions and will not be elaborated here.

[0075] As an optional embodiment, during assembly, the heating body 3 and the limiting body 6 can be first placed between the first connector 1 and the second connector 2, and then the first connector 1, the heating body 3 and the second connector 2 are fixed into a whole through the fastening body 5, and then the nozzle 4 is passed through the first connector 1, the heating body 3 and the second connector 2 in sequence in the opposite direction of the discharge direction, and the nozzle 4 is fixed to the second connector 2, so that the nozzle 4 is assembled to the above-mentioned whole to form a print head assembly, which not only has a simple structure, but also is easy to assemble and disassemble, and also improves the heat conduction efficiency.

[0076] The 3D printer according to the embodiment of the present application includes any one of the above-mentioned print head assemblies.

[0077] In an embodiment of the present application, the second connector 2 and the first connector 1 are arranged in sequence along the discharge direction of the print head assembly and are fixedly connected, the heating body 3 is confined between the first connector 1 and the second connector 2, the nozzle 4 is passed through the first connector 1, the heating body 3 and the second connector 2, and the nozzle 4 is detachably fixed to the second connector 2. Since the second connector 2, the heating body 3 and the first connector 1 are arranged in sequence along the discharge direction of the print head assembly, fixing the nozzle 4 on the second connector 2 can minimize the influence of the heating body 3 on the assembly structure of the nozzle 4, and avoid the assembly structure of the nozzle 4 from being too high as much as possible, thereby avoiding the deformation of the assembly structure of the nozzle 4 due to heat. The nozzle 4 can be removed without using tools, which is convenient for loading and unloading. Moreover, the nozzle 4 is directly penetrated by the heating body 3, and the heat generated by the heating body 3 can be directly conducted to the nozzle 4 without the need for a heating block or other structure. The heat conduction efficiency can be effectively improved, thereby more fully, effectively and quickly hot-melting the consumables passing through the nozzle 4, so that the three-dimensional printer can meet greater flow requirements and can be suitable for high-speed printing scenarios.

[0078] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments merely represent preferred embodiments of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A print head assembly, characterized in that: include: a first connector; a second connecting body, the second connecting body and the first connecting body being sequentially spaced apart and fixedly connected along a discharge direction of the print head assembly; a heating body confined between the first connecting body and the second connecting body; and a nozzle, which is provided through the first connecting body, the heating body and the second connecting body, and is detachably fixed to the second connecting body; Wherein, the heating body is used to heat-melt the consumables passing through the nozzle.

2. The print head assembly according to claim 1, wherein: The nozzle has a feeding end and a discharging end sequentially arranged along the discharging direction, and the feeding end of the nozzle sequentially passes through the first connector, the heating body and the second connector.

3. The print head assembly according to claim 1, wherein: The nozzle is threadedly connected to the second connector.

4. The print head assembly according to claim 1, wherein: The first connector is provided with a first assembly hole for cooperating with the nozzle and a first countersunk hole for cooperating with the heating body, and the second connector is provided with a second assembly hole for cooperating with the nozzle and a second countersunk hole for cooperating with the heating body, and the first assembly hole, the second assembly hole, the first countersunk hole and the second countersunk hole are coaxially arranged; One end portion of the heating body is confined within the first countersunk hole, and the other end portion of the heating body is confined within the second countersunk hole.

5. The print head assembly according to claim 4, wherein: There is a gap between the outer surface of the heating body and the hole wall of the first countersunk hole, and there is a gap between the outer surface of the heating body and the hole wall of the second countersunk hole.

6. The print head assembly according to claim 4, wherein: The first connector has a first limiting surface perpendicular to the discharge direction, the first assembly hole is formed on the first limiting surface and is connected to the first sink hole along the discharge direction; The second connector has a second limiting surface perpendicular to the discharge direction, and the second assembly hole is formed on the second limiting surface and communicates with the second sink hole along the discharge direction; The nozzle has a first step surface and a second step surface spaced apart in the discharge direction; Wherein, the first step surface abuts against the first limiting surface, and / or the second step surface abuts against the second limiting surface.

7. The print head assembly according to claim 1, wherein: The heating body has a heating hole that passes through the heating body along the discharge direction; The nozzle is inserted into the heating hole, and the outer surface of the nozzle is in direct contact with the hole wall of the heating hole.

8. The print head assembly according to claim 1, wherein: The print head assembly further includes a fastening body configured to fixedly connect the first connecting body and the second connecting body.

9. The print head assembly according to claim 8, wherein: The print head assembly includes two fastening bodies, and the two fastening bodies are arranged in axisymmetry with respect to the axis of the nozzle.

10. The print head assembly according to claim 8, wherein: The first connector has a third limiting surface arranged perpendicular to the discharging direction and a third assembly hole opened on the third limiting surface and passing through the first connector along the discharging direction; The second connector has a fourth limiting surface arranged perpendicular to the discharging direction and a fourth assembly hole opened on the fourth limiting surface and passing through the second connector along the discharging direction; The fastening body has a third step surface and a fourth step surface spaced apart in the discharge direction; The fastening body is configured to be connected to the third assembly hole and the fourth assembly hole, and the third step surface abuts against the third limiting surface, and the fourth step surface abuts against the fourth limiting surface.

11. The print head assembly according to claim 8, wherein: The print head assembly further includes a cylindrical limiting body, which is sleeved outside the fastening body and abuts between the first connecting body and the second connecting body.

12. A 3D printer, characterized in that: The device comprises a print head assembly according to any one of claims 1 to 11.

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