Hot end, spray head suite applying same and 3D printing equipment

Abstract

The utility model provides a hot end suitable for a high-speed printing process and a spray head kit and 3D printing equipment applying the hot end. The hot end comprises a heated part, a nozzle part and a flow guide pipe; a first mounting space and a second mounting space are formed in the two spaced ends of the heated part respectively; the nozzle part comprises a connecting end provided with an external thread, the first mounting space is used for containing the connecting end to enable the external thread to abut against the heated part, and the nozzle part is detachably connected with the heated part; one end of the flow guide pipe extends into the second mounting space and is detachably connected with the heated part through interference fit; a conveying channel used for conveying consumables is formed in the hot end, and the conveying channel is configured to sequentially penetrate through the flow guide pipe, the heated part and the nozzle part. According to the hot end, the spray head kit applying the hot end and the 3D printing equipment, the heated part, the nozzle part and the flow guide pipe are integrally arranged, the heated area is optimized, and the extrusion speed is increased; and on the basis of integration, runner sharing is achieved, part splicing is reduced, the feeding resistance is reduced, and the extrusion quality and the use convenience are improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a hot end and a nozzle kit and 3D printing equipment using the hot end. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses digital model files as the basis, special wax materials, powdered metals or plastics and other bondable materials to print layers of materials to create three-dimensional objects. Fused deposition modeling technology is one of the main 3D printing technologies. This technology heats and melts the hot-melt filament, squeezes it out from the nozzle, and deposits it on the molding platform or the previous layer of solidified material to finally generate a physical object.

[0003] The nozzles in the prior art are usually detachable nozzles or integrated nozzles in the traditional sense; "detachable nozzles in the traditional sense" are usually composed of three detachable parts: a throat (external heat sink), a heating block and a nozzle. When facing disassembly and assembly, most of them cannot directly remove the entire nozzle kit from the print head; "integrated nozzles in the traditional sense" are usually obtained by welding or one-piece molding to obtain non-detachable one-piece nozzles, but because the nozzle size is generally small, the welding process is more difficult, and the welded or one-piece molded nozzle structure is difficult to adapt to nozzles of different sizes, resulting in poor parts sharing on the production end. Utility Model Content

[0004] In order to solve the problems in the prior art, the embodiments of the present application provide a hot end that is easy to disassemble and assemble at the production end, has a strong structure at the use end and is better suitable for high-speed printing, and a nozzle kit and 3D printing equipment using the same.

[0005] The embodiment of the present application provides a hot end, including a heated part, a nozzle part and a flow guide tube. The two ends of the heated part are respectively provided with a first installation space and a second installation space; the nozzle part includes a connection end provided with an external thread, the first installation space is used to accommodate the connection end so that the external thread abuts against the heated part, and the nozzle part is detachably connected to the heated part; one end of the flow guide tube extends into the second installation space and is detachably connected to the heated part by an interference fit; a transmission channel for conveying consumables is formed in the hot end, and the transmission channel is configured to sequentially pass through the flow guide tube, the heated part and the nozzle part.

[0006] It can be understood that in the hot end of the present application, the nozzle part is connected to the heated part by a threaded tight fit, and the guide tube is connected to the heated part by an interference fit. On the one hand, the structure ensures the integrated setting of the heated part, the nozzle part and the guide tube after connection, optimizes the heated area and increases the extrusion speed; on the other hand, the structure realizes the sharing of the transmission channel (flow channel) on the basis of integration, reduces the splicing of parts, reduces the feed resistance and improves the extrusion quality; on the other hand, the heated part, the nozzle part and the guide tube are firmly connected and not easy to separate, objectively realizing the integration of the hot end and ensuring the reliability of the hot end when used by the user end; at the same time, during production and assembly, the parts in the hot end can be disassembled, thereby realizing the replacement and / or sharing of parts of different specifications, expanding the application scenarios.

[0007] In one embodiment, the connecting end includes a first outer wall surface, the external thread is arranged to be raised compared to the first outer wall surface, the heated part includes a first inner wall surface surrounding the first installation space, the external thread is abutted against the first inner wall surface, and the first outer wall surface is constructed to be spaced apart from the first inner wall surface to form a mechanical gap.

[0008] In one embodiment, the transmission channel extends in a first direction, the length of the external thread along the first direction is less than the length of the first outer wall surface along the first direction, and the mechanical gap is distributed on both sides of the external thread along the first direction.

[0009] In one embodiment, the first inner wall surface is a smooth surface structure.

[0010] In one embodiment, the guide tube includes a first end and a second end spaced apart, the second end is configured to extend into the second installation space, the first end corresponds to the feed end of the hot end, and a section of the transmission channel located at the first end is configured to be conical.

[0011] In one embodiment, the flow guide tube includes a second outer wall surface located at its outer periphery, the heat receiving component includes a second inner wall surface surrounding the second installation space, and a portion of the second outer wall surface located in the second installation space abuts against the second inner wall surface.

[0012] In one embodiment, both the second outer wall surface and the second inner wall surface are smooth structures.

[0013] In one embodiment, the hot end further includes a heat conductive member, which is sleeved on the outside of the flow guide tube, and the heat conductive member and the heat receiving member are spaced apart, the heat conductive member is used for thermal coupling with the heat dissipation component, and the heat receiving member is used for thermal coupling with the heating component.

[0014] The embodiment of the present application also provides a nozzle kit, which includes a heating component, a heat dissipation component and a hot end as described in any one of the above embodiments, the heating component is connected to and thermally coupled with the heated component, and the heat dissipation component is thermally coupled with the guide tube.

[0015] An embodiment of the present application also provides a 3D printing device, which includes a device body, a printing platform, and a hot end as described in any one of the aforementioned embodiments or a nozzle kit as described in the aforementioned embodiments, wherein the hot end and the printing platform are respectively movably connected to the device body.

[0016] It can be understood that the nozzle kit and 3D printing equipment of the present application are applied with the aforementioned hot end, so that the nozzle kit and 3D printing equipment can better adapt to high-speed 3D printing, and have more advantages in terms of printing speed, printing quality, easy disassembly and assembly at the production end, and firm structure at the use end. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional schematic diagram of the hot end provided in an embodiment of the present application.

[0018] Figure 2 A schematic diagram of a three-dimensional exploded view of the hot end provided in an embodiment of the present application.

[0019] Figure 3 for Figure 1 The hot end is shown in a schematic cross-sectional view along direction III-III.

[0020] Figure 4 for Figure 3 Schematic diagram of a partial enlargement of the middle IV region.

[0021] Figure 5 A three-dimensional schematic diagram of the nozzle kit provided in an embodiment of the present application.

[0022] Figure 6 A schematic three-dimensional exploded view of the nozzle kit provided in an embodiment of the present application.

[0023] Figure 7 for Figure 5 The shown schematic cross-sectional view of the nozzle kit along the VII-VII direction.

[0024] Figure 8 for Figure 7 A partial enlarged schematic diagram of region VIII in the middle.

[0025] Fig. 9 A three-dimensional schematic diagram of a 3D printing device provided in an embodiment of the present application.

[0026] Main component symbols

[0027] Nozzle Kit 10

[0028] Hot End 11

[0029] Transmission channel 110

[0030] First subchannel 1101

[0031] Second subchannel 1102

[0032] The third subchannel 1103

[0033] Heating parts 111

[0034] First installation space 1111

[0035] Second installation space 1112

[0036] First inner wall surface 1113

[0037] Second inner wall surface 1114

[0038] First mounting thread 1115

[0039] Nozzle section 112

[0040] Connection terminal 1121

[0041] Mechanical clearance 11210

[0042] First outer wall 11211

[0043] External thread 11212

[0044] Discharge end 1122

[0045] Side wall 11221

[0046] Flow guide tube 113

[0047] First End 1131

[0048] Second end 1132

[0049] Second outer wall 1133

[0050] Heat conducting parts 114

[0051] Feed end 115

[0052] Heating element 12

[0053] Second mounting thread 121

[0054] Fourth mounting thread 122

[0055] Connecting components 13

[0056] Connecting body 131

[0057] The third mounting thread 1311

[0058] Installation section 1312

[0059] Fastening bolt 132

[0060] Heat dissipation component 14

[0061] Heat dissipation body 141

[0062] Mounting hole 1411

[0063] Heat dissipation blade 1412

[0064] Abutment 142

[0065] 3D printing equipment1

[0066] Equipment body 15

[0067] Printing platform 16

[0068] First direction X

[0069] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0070] The following description will refer to the accompanying drawings to more fully describe the content of the present application. The accompanying drawings show exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components. The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "one", "an" and "the" are intended to also include plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as those generally understood by ordinary technicians in the field to which the present application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning. The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0071] Generally, the nozzles in the prior art are usually detachable nozzles or integrated nozzles in the traditional sense; "detachable nozzles in the traditional sense" are usually formed by a throat (external heat sink), a heating block and a nozzle that can be detachably installed. When facing disassembly and assembly, most of them cannot directly remove the entire nozzle kit from the print head; "integrated nozzles in the traditional sense" are usually obtained by welding or one-piece molding to obtain a non-detachable one-piece nozzle, but because the nozzle size is generally small, the welding process is more difficult, and the welded or one-piece molded nozzle structure is difficult to adapt to nozzles of different sizes, resulting in poor parts sharing on the production end.

[0072] Therefore, an embodiment of the present application provides a hot end, including a heated part, a nozzle portion, and a flow guide tube. A first installation space and a second installation space are respectively provided at both ends of the heated part interval; the nozzle portion includes a connecting end provided with an external thread, the connecting end extends into the first installation space so that the external thread abuts against the heated part; one end of the flow guide tube extends into the second installation space and is connected to the heated part by an interference fit; a transmission channel for conveying consumables is formed in the hot end, and the transmission channel is configured to sequentially pass through the flow guide tube, the heated part, and the nozzle portion. An embodiment of the present application also provides a nozzle assembly and a 3D printing device using the hot end.

[0073] Among them, in the hot end of the present application, the nozzle part is connected to the heated part by a threaded tight fit, and the guide tube is connected to the heated part by an interference fit. On the one hand, the structure ensures the integrated setting of the heated part, the nozzle part and the guide tube, optimizes the heated area and improves the extrusion speed; on the other hand, the structure realizes the sharing of the transmission channel (flow channel) on the basis of integration, reduces the splicing of parts, reduces the feed resistance, and improves the extrusion quality; on the other hand, the heated part, the nozzle part and the guide tube are connected, and the structure is firm and not easy to separate, which objectively realizes the integration of the hot end and ensures the reliability of the hot end when the user end uses it; at the same time, during production and assembly, the parts in the hot end can be disassembled, thereby realizing the replacement and / or sharing of parts of different specifications, and expanding the application scene. The nozzle kit and 3D printing equipment of the present application can better adapt to high-speed 3D printing, and have more advantages in printing speed, printing quality, and convenience of disassembly and assembly.

[0074] Those skilled in the art will understand that "3D printing equipment" refers to equipment that can achieve 3D printing (additive manufacturing).

[0075] Those skilled in the art will understand that "interference fit" means using the elasticity of the material to expand and deform the hole so that it can be put on the shaft. When the hole is restored, a tightening force is generated on the shaft to connect the two parts.

[0076] Those skilled in the art will understand that "thermal coupling" refers to a heat transfer connection, and heat transfer can be achieved through heat transfer, heat convection or heat radiation, or any combination of the above three methods.

[0077] Those skilled in the art will understand that "consumables" refer to rod-shaped thermoplastic materials that are in a solid state at room temperature. The consumables can be melted by heat and then cooled to form.

[0078] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0079] like Figure 1 and Figure 2 As shown, Figure 1This is a three-dimensional schematic diagram of the hot end 11 provided in the embodiment of the present application. Figure 2 This is a schematic three-dimensional exploded view of the hot end 11 provided in an embodiment of the present application.

[0080] The embodiment of the present application provides a hot end 11, including a heated component 111, a nozzle portion 112, and a flow guide tube 113. The nozzle portion 112 and the flow guide tube 113 are respectively connected to the two opposite sides of the heated component 111, so that the heated component 111, the nozzle portion 112, and the flow guide tube 113 form a whole, and a transmission channel 110 for conveying consumables is formed in the hot end 11. The transmission channel 110 is configured to sequentially penetrate the flow guide tube 113, the heated component 111, and the nozzle portion 112. The consumables (not shown) pass through the flow guide tube 113, the heated component 111, and the nozzle portion 112 in sequence through the transmission channel 110.

[0081] In one embodiment, the hot end 11 further includes a heat conducting member 114, which is sleeved on the outside of the flow guide tube 113. The heat conducting member 114 and the heat receiving member 111 are spaced apart to improve the overall thermal efficiency of the hot end 11. The heat conducting member 114 is used for thermal coupling with a heat dissipation component (not shown), and the heat receiving member 111 is used for thermal coupling with a heating component (not shown).

[0082] It can be understood that the guide tube 113 is at least used for the introduction and heating of consumables, the heat receiving component 111 is at least used for transferring heat to increase the temperature in the transmission channel 110, the nozzle portion 112 is at least used for the extrusion of molten consumables, the heat conducting component 114 is at least used for the heat dissipation of the consumables, and the transmission channel 110 is at least used for the transmission of consumables.

[0083] In one embodiment, a first installation space 1111 and a second installation space 1112 are respectively provided at both ends of the interval of the heated component 111; the nozzle portion 112 includes a connecting end 1121 provided with an external thread 11212, and the first installation space 1111 is used to accommodate the connecting end 1121 so that the external thread 11212 abuts against the heated component 111, and the nozzle portion 112 is detachably connected to the heated component 111; one end of the guide tube 113 extends into the second installation space 1112 and is detachably connected to the heated component 111 by interference fit.

[0084] It can be understood that the nozzle portion 112 is connected to the heated component 111 by means of a threaded tight fit, and the flow guide tube 113 is connected to the heated component 111 by means of an interference fit. On the one hand, the structure ensures the integrated setting of the heated part 111, the nozzle part 112 and the guide tube 113, optimizes the heated area and improves the extrusion speed; on the other hand, the structure realizes the sharing of the transmission channel 110 (flow channel) on the basis of integration, reduces the splicing of parts, reduces the feeding resistance, and improves the extrusion quality; on the other hand, after the heated part 111, the nozzle part 112 and the guide tube 113 are connected, the structure is firm and not easy to separate, objectively realizing the integration of the hot end 11, ensuring the reliability of the hot end 11 when used by the user end, and at the same time, during production and assembly, the parts of the hot end 11 (at least including the heated part 111, the nozzle part 112 and the guide tube 113) can be disassembled, thereby realizing the replacement and / or sharing of parts of different specifications, and expanding the application scenarios (for example, nozzle parts 112 of different sizes can be replaced to adapt to consumables or printing environments of different sizes, and the heated part 111 and the guide tube 113 can still be shared when the nozzle part 112 is replaced).

[0085] Further integration Figure 3 and Figure 4 As shown, Figure 3 for Figure 1 The cross-sectional schematic diagram of the hot end 11 along the III-III direction is shown, Figure 4 for Figure 3 Schematic diagram of a partial enlargement of the middle IV region.

[0086] In one embodiment, the transmission channel 110 extends in a first direction X, and the transmission channel 110 is divided into a first sub-channel 1101, a second sub-channel 1102, and a third sub-channel 1103 that are connected in sequence along the first direction X. The first sub-channel 1101 is located in the flow guide tube 113, the second sub-channel 1102 is located in the heat receiving element 111, and the third sub-channel 1103 is located in the nozzle portion 112; the heat conducting element 114 is located outside the transmission channel 110.

[0087] It can be understood that when the hot end 11 cooperates with the consumables to print, the consumables enter from the first sub-channel 1101, and pass through the first sub-channel 1101, the second sub-channel 1102 and the third sub-channel 1103 in sequence to reach the nozzle part 112. During this process, the consumables entering the transmission channel 110 gradually melt into a molten state, and are finally squeezed out from the nozzle part 112.

[0088] In one embodiment, the heat receiving element 111 is a columnar structure, and the first installation space 1111 and the second installation space 1112 are respectively opened at two ends of the heat receiving element 111 spaced apart along the first direction X. The heat receiving element 111 includes a first inner wall surface 1113 and a second inner wall surface 1114. The first inner wall surface 1113 is located at one end of the heat receiving element 111 and is used to enclose the first installation space 1111. The second inner wall surface 1114 is located at the other end of the heat receiving element 111 and is used to enclose the second installation space 1112. When the heat receiving element 111 is not connected to the flow guide tube 113 and the nozzle part 112, the first installation space 1111 and the second installation space 1112 are respectively connected to the second sub-channel 1102; when the heat receiving element 111 is connected to the flow guide tube 113 and the nozzle part 112, the first sub-channel 1101, the second sub-channel 1102 and the third sub-channel 1103 are connected, and the first installation space 1111 and the second installation space 1112 are constructed to no longer be connected to the second sub-channel 1102.

[0089] It can be understood that the first installation space 1111, the second installation space 1112 and the second sub-channel 1102 are all formed inside the heated member 111, the first installation space 1111 is used to accommodate the connection end 1121 of the nozzle portion 112, and the second installation space 1112 is used to accommodate the end of the flow guide tube 113. In order to ensure the communication between the first sub-channel 1101, the second sub-channel 1102 and the third sub-channel 1103, it is necessary to make the first installation space 1111 and the second installation space 1112 communicate with the second sub-channel 1102 respectively when the heated member 111 is not connected to the flow guide tube 113 and the nozzle portion 112. On the other hand, when the heated member 111 is connected to the flow guide tube 113 and the nozzle portion 112, the first installation space 1111 and the second installation space 1112 are constructed so as not to be connected to the second sub-channel 1102 to avoid material leakage.

[0090] In other embodiments, on a plane perpendicular to the first direction X, the inner diameters of the openings of the first installation space 1111 and the second installation space 1112 are both larger than the inner diameter of the second sub-channel 1102, and the space gaps generated by the inner diameter difference between the first installation space 1111 and the second installation space 1112 and the second sub-channel 1102 can be used to accommodate the solid parts of the flow guide tube 113 and the connection end 1121. In other embodiments, based on this connection method, at the respective joints, the aperture of the first sub-channel 1101 can be made smaller than the aperture of the second sub-channel 1102; and / or, the aperture of the second sub-channel 1102 is smaller than the aperture of the third sub-channel 1103, which can reduce the risk of leakage during the transmission of consumables. It is understandable that the apertures of the first sub-channel 1101, the second sub-channel 1102, and the third sub-channel 1103 can also be the same.

[0091] In one embodiment, the outer periphery of the heated member 111 is provided with a first mounting thread 1115 to facilitate the connection of the heated member 111 with an external heating assembly (not shown). It can be understood that the heated member 111 is used to transfer heat to increase the temperature in the transmission channel 110, and the consumables passing through the transmission channel 110 are gradually melted by the heat to facilitate subsequent ejection printing. The heated member 111, the nozzle portion 112, and the guide tube 113 are connected and integrated, and the nozzle portion 112 and the guide tube 113 are thermally coupled with the heated member 111. The overall heating area of ​​the transmission channel 110 of the hot end 11 is more uniform, and the consumables are heated more evenly and melted more fully as a whole. At the same time, the viscosity of the molten consumables is reduced, the printing pressure is reduced, and blockage is avoided.

[0092] In one embodiment, the nozzle portion 112 further includes a discharge end 1122, which is integrally connected to the connection end 1121; the third sub-channel 1103 sequentially penetrates the connection end 1121 and the discharge end 1122 along the first direction X, and the radius of the third sub-channel 1103 gradually decreases at the discharge end 1122 to facilitate extrusion molding of the molten consumable. The radius of the discharge end 1122 is greater than the radius of the connection end 1121, so that the side wall 11221 of the discharge end 1122 close to the connection end 1121 blocks the first installation space 1111, further preventing leakage.

[0093] In one embodiment, the external thread 11212 is raised compared to the first outer wall surface 11211 of the connecting end 1121, and the raised external thread 11212 abuts against the first inner wall surface 1113 of the heated part 111. The first outer wall surface 11211 is constructed to be spaced apart from the first inner wall surface 1113 to form a mechanical gap 11210.

[0094] In this embodiment, the first inner wall surface 1113 is a smooth surface structure.

[0095] It is understandable that the outer thread 11212 is matched with the smooth first inner wall surface 1113, which can not only fix the nozzle part 112 and the heated part 111 by means of tight thread fit, but also make the replacement of the nozzle part 112 more convenient. In the manufacturing process, nozzle parts 112 of different specifications can be selected for installation as needed, and the reliability of the connection is also high, which can prevent the nozzle part 112 from falling out when it is removed by the user or during the use and transportation of the hot end 11.

[0096] In this embodiment, the shape enclosed by the first inner wall surface 1113 can be constructed as a hexagon, and the external thread 11212 is roughly cylindrical; in other embodiments, the shape enclosed by the first inner wall surface 1113 can also be cylindrical or other shapes.

[0097] In this embodiment, the length of the external thread 11212 along the first direction X is smaller than the length of the first outer wall surface 11211 along the first direction X, and mechanical gaps 11210 are distributed on both sides of the external thread 11212 along the first direction X.

[0098] It is understandable that when the nozzle part 112 is connected to the heated part 111, mechanical gaps 11210 are distributed on both the upper and lower sides of the external thread 11212, and the mechanical gaps 11210 can provide tolerance for the inevitable errors in the installation and manufacturing process. If the contact surface between the external thread 11212 and the first inner wall surface 1113 becomes an inclined surface due to insufficient manufacturing process precision, the position of the nozzle part 112 can be adjusted within a certain range by setting the mechanical gap 11210, so as to avoid the installation of the nozzle part 112 from tilting. Similarly, the mechanical gap 11210 can also be the assembly error tolerance caused by the installation process; or, under long-term high temperature conditions, the nozzle part 112 or the heated part 111 has deformation caused by slight expansion, and the mechanical gap 11210 can provide a buffer space for this deformation, so as to avoid the structural deformation caused by it.

[0099] In one embodiment, the guide tube 113 includes a first end 1131 and a second end 1132 spaced apart, the second end 1132 extends into the second installation space 1112, the first end 1131 corresponds to the feed end 115 of the hot end 11, and a section of the transmission channel 110 located at the first end 1131 is constructed as a cone.

[0100] It can be understood that "a section of the transmission channel 110 located at the first end 1131 is configured as a cone" means that the inner diameter of at least a section of the first subchannel 1101 away from the second end 1132 is regularly distributed from large to small; specifically, the inner diameter of the first subchannel 1101 is the largest at the top of the first end 1131 (feed end 115), and gradually decreases along the first direction X toward the side where the second end 1132 is located. Further, the inner diameter of the first subchannel 1101 at the top of the first end 1131 is configured to be slightly larger than the diameter of the consumables, so as to guide the consumables entering the hot end 11 to avoid blockage.

[0101] In one embodiment, the flow guide tube 113 includes a second outer wall surface 1133 located at its outer periphery, and the second outer wall surface 1133 extending into the second installation space 1112 abuts against the second inner wall surface 1114 of the heat receiving element 111. In this embodiment, the second outer wall surface 1133 and the second inner wall surface 1114 are both smooth structures.

[0102] It can be understood that the smooth first outer wall surface 11211 and the second outer wall surface 1133 abut against each other, and the second end 1132 is fixed in the second installation space 1112 by interference fit, which is convenient for disassembly and assembly, and can make the heating area more uniform and less prone to blockage.

[0103] In one embodiment, the flow guide tube 113 can be made of a material with low heat transfer efficiency, such as titanium alloy; the heat conductor 114 can be made of a material with better heat transfer effect, such as copper; the heat receiving element 111 can be made of a material with better heat transfer effect, such as copper.

[0104] It can be understood that the hot end 11 of the present application realizes integrated material guiding, heating, and extrusion from a structural point of view, so that the heated area is more uniform, efficient melting, and not easy to block the material; at the same time, the hot end 11 structure is integrated and universal, and the structure is shared, which is not affected by the overall disassembly and assembly. The hot end 11 of the present application adds a modular extrusion nozzle design on the basis of integration. The heated part 111 and the nozzle part 112 can be separately arranged. The nozzle parts 112 of different calibers can be replaced according to actual needs to realize nozzle sharing. The nozzle parts 112 of different sizes can also be replaced according to actual production needs to meet the needs of different users and achieve high-quality printing. The hot end 11 of the present application realizes flow channel sharing on the basis of integration, reduces parts splicing, reduces feed resistance, and improves extrusion quality. The hot end 11 of the present application adds a conical transmission channel 110 design on the basis of integration to reduce local resistance, quickly change materials, and is not easy to get stuck.

[0105] Further integration Figure 5 and Figure 6 As shown, Figure 5 This is a three-dimensional schematic diagram of the nozzle kit 10 provided in an embodiment of the present application. Figure 6 This is a schematic three-dimensional exploded view of the nozzle kit 10 provided in an embodiment of the present application.

[0106] The embodiment of the present application also provides a nozzle kit 10, which includes a heating component 12, a heat dissipation component 14 and a hot end 11 as in any one of the aforementioned embodiments, the heating component 12 is connected and thermally coupled to a heated component 111, and the heat dissipation component 14 is thermally coupled to a flow guide tube 113.

[0107] In one embodiment, the nozzle kit 10 also includes a connecting component 13, a heating component 12 is sleeved on the outside of the heat receiving part 111 and is threadedly connected to the heat receiving part 111, and the heating component 12 is used to generate heat; the connecting component 13 is sleeved on one end of the outside of the heating component 12 and is threadedly connected to the heating component 12, and the heat dissipation component 14 is sleeved on the outside of the guide tube 113 and is connected to the connecting component 13 to achieve positioning, the connecting component 13 is used to connect and fix the heat dissipation component 14, and the heat dissipation component 14 is used to be thermally coupled with the guide tube 113 and the heat conductive part 114 to dissipate heat.

[0108] Further integration Figure 7 and Figure 8 As shown, Figure 7 for Figure 5 The schematic cross-sectional view of the nozzle assembly 10 along the VII-VII direction is shown. Figure 8 for Figure 7 A partial enlarged schematic diagram of region VIII in the middle.

[0109] In one embodiment, the heating component 12 is generally hollow cylindrical, and a ceramic heating ring (not shown) or a resistance wire (not shown) for generating heat may be integrated therein. A second mounting thread 121 is provided on the inner side of the heating component 12, and the second mounting thread 121 cooperates with the first mounting thread 1115 to realize the connection between the heating component 12 and the heated member 111.

[0110] It can be understood that the heat generated by the ceramic heating ring and the resistance wire is transferred to the transmission channel 110 through the heating element 111 to melt the consumables. A temperature sensor (not shown) can be provided at one end of the heating component 12 close to the nozzle portion 112. The temperature sensor is used to sense the temperature of the hot end 11. The temperature sensor can be a thermistor or other electronic components that can sense heat.

[0111] In one embodiment, the connection assembly 13 includes a connection body 131 and two fastening bolts 132. The connection body 131 is generally hollow and annular, and a third mounting thread 1311 is provided on the inner side of the connection body 131. A fourth mounting thread 122 is provided on the outer side of the heating assembly 12 near the end of the flow guide tube 113. The third mounting thread 1311 cooperates with the fourth mounting thread 122 to realize the connection of the connection body 131 for the heating assembly 12. The outer side of the connection body 131 has a mounting portion 1312 protruding toward the side where the flow guide tube 113 is located along the first direction X. The two fastening bolts 132 are respectively arranged through the two mounting portions 1312 and further extend to the heat dissipation assembly 14 supported by the mounting portion 1312, thereby realizing the installation and positioning of the heat dissipation assembly 14.

[0112] In one embodiment, the heat dissipation assembly 14 includes a heat dissipation body 141 and a supporting member 142. The heat dissipation assembly 14 is sleeved on the outside of the air guide tube 113 and the heat conductive member 114 and is thermally coupled with the air guide tube 113 and the heat conductive member 114. The heat dissipation blades 1412 on the heat dissipation body 141 are extended in a direction away from the air guide tube 113 and the heat conductive member 114 to improve the heat dissipation efficiency. The heat dissipation body 141 is provided with a mounting hole 1411, and the extending direction of the mounting hole 1411 intersects with or is even perpendicular to the first direction X. The supporting member 142 is disposed in the mounting hole 1411 and abuts against the side wall 11221 of the heat conductive member 114.

[0113] It can be understood that the heat dissipation component 14 is installed and positioned by cooperating with the connecting component 13 and the heating component 12. The heat dissipation component 14 and the connecting component 13 can be quickly disassembled, so that the heat dissipation component 14 and the guide tube 113 and the heated component 111 can be quickly separated to facilitate the rapid replacement of the guide tube 113 or the heat conductive component 114.

[0114] Further integration Fig. 9 As shown, Fig. 9 The present invention also provides a 3D printing device 1, which includes a device body 15, a printing platform 16, and a hot end 11 as in any of the above embodiments or a nozzle kit 10 as in the above embodiments, and the hot end 11 and the printing platform 16 are movably connected to the device body 15, respectively.

[0115] It can be understood that the nozzle kit 10 and the 3D printing device 1 of the present application are applied with the aforementioned hot end 11, so that the nozzle kit 10 and the 3D printing device 1 can better adapt to high-speed 3D printing, and have more advantages in terms of printing speed, printing quality, and ease of disassembly and assembly.

[0116] It can be understood that the 3D printing device 1 of the present application has a hot end 11 suitable for high-speed printing, so that the 3D printing device 1 can be used to achieve high-speed printing. The 3D printing device 1 can also include other necessary functional units for achieving 3D printing, which are not repeated here.

[0117] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A hot end, It is characterized in that include: The heat receiving element has a first installation space and a second installation space respectively formed at two ends of the interval; The nozzle part comprises a connection end provided with an external thread, the first installation space is used to accommodate the connection end so that the external thread abuts against the heat receiving part, and the nozzle part is detachably connected to the heat receiving part; A flow guide pipe, one end of which extends into the second installation space and is detachably connected to the heat receiving element by means of interference fit; A transmission channel for conveying consumables is formed in the hot end, and the transmission channel is configured to sequentially penetrate the guide tube, the heat receiving component and the nozzle portion.

2. The hot end as claimed in claim 1, It is characterized in that The connecting end includes a first outer wall surface, the external thread is arranged to be raised compared to the first outer wall surface, the heated part includes a first inner wall surface surrounding the first installation space, the external thread is abutted against the first inner wall surface, and the first outer wall surface is constructed to be spaced apart from the first inner wall surface to form a mechanical gap.

3. The hot end as claimed in claim 2, It is characterized in that The transmission channel extends in a first direction, the length of the external thread along the first direction is smaller than the length of the first outer wall surface along the first direction, and the mechanical gap is distributed on both sides of the external thread along the first direction.

4. The hot end as claimed in claim 2, It is characterized in that The first inner wall surface is a smooth surface structure.

5. The hot end as claimed in claim 1, It is characterized in that The guide tube includes a first end and a second end spaced apart from each other, the second end is configured to extend into the second installation space, the first end corresponds to the feed end of the hot end, and a section of the transmission channel located at the first end is configured to be conical.

6. The hot end as claimed in claim 1, It is characterized in that The flow guide pipe includes a second outer wall surface located at the outer periphery thereof, the heat receiving component includes a second inner wall surface surrounding the second installation space, and a portion of the second outer wall surface located in the second installation space abuts against the second inner wall surface.

7. The hot end as claimed in claim 6, It is characterized in that The second outer wall surface and the second inner wall surface are both smooth structures.

8. The hot end as claimed in claim 1, It is characterized in that The hot end also includes a heat conductive member, which is sleeved on the outside of the flow guide tube, and the heat conductive member and the heat receiving member are spaced apart. The heat conductive member is used for thermal coupling with a heat dissipation component, and the heat receiving member is used for thermal coupling with a heating component.

9. A nozzle kit, It is characterized in that It comprises a heating component, a heat dissipation component and a hot end as claimed in any one of claims 1 to 8, wherein the heating component is connected to and thermally coupled with the heated component, and the heat dissipation component is thermally coupled with the flow guide tube.

10. A 3D printing device, It is characterized in that include: Equipment body; Printing platform; as well as The hot end according to any one of claims 1 to 8 or the nozzle kit according to claim 9, wherein the hot end and the printing platform are respectively movably connected to the device body.

Images