3D printing nozzle assembly and 3D printer

Abstract

The utility model provides a 3D printing nozzle assembly and a 3D printer. The 3D printing nozzle assembly provided by the utility model comprises a feeding part used for conveying consumables; the heating part is communicated with the feeding part and is used for heating the consumables from the feeding part and extruding the heated consumables; the heat insulation part is arranged between the feeding part and the heating part and is used for preventing heat of the heating part from being conducted to the feeding part; and the cooling part comprises a first nozzle, and the first nozzle is used for spraying mist towards the extruded consumables so as to cool the extruded consumables. According to the 3D printing spray head assembly, the model cooling speed can be greatly increased, and the 3D printing spray head assembly can be suitable for high-speed printing.

Description

Technical Field

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

[0002] 3D printers are developing towards high-speed printing, and one of the core issues of high-speed printing is "model cooling". In response to the demand for high-speed printing, the filament will be extruded at a high volume flow rate and formed on the printing platform. However, the newly extruded filament is in a high-temperature molten state. If it cannot be cooled quickly, it will be affected by factors such as gravity and wind, and will move away from the predetermined position, causing model distortion. Therefore, when printing structures such as overhangs and bridges, it is necessary to increase the cooling rate by reducing the printing speed (filament extrusion rate). The problem that still exists is that although the problem of model accuracy has been solved, it is contrary to the vision of high-speed printing. In this context, studying the rapid cooling of the model is crucial to improving printing accuracy and shortening printing time. Utility Model Content

[0003] The purpose of this application is to provide a 3D printing nozzle assembly and a 3D printer to solve the technical problems of insufficient model cooling and poor model accuracy in the prior art.

[0004] The technical solution of this application is as follows: a 3D printing nozzle assembly is provided, comprising:

[0005] Feeding section, used for conveying consumables;

[0006] a heating portion, connected to the feeding portion, for heating the consumables from the feeding portion and extruding the heated consumables;

[0007] a heat insulating portion, provided between the feeding portion and the heating portion, for preventing the heat of the heating portion from being transferred to the feeding portion;

[0008] and

[0009] The cooling portion includes a first nozzle, wherein the first nozzle is used to spray spray toward the extruded consumable material to cool the extruded consumable material.

[0010] Furthermore, the heated consumable material is extruded onto the printing platform along a first direction, and the first nozzle and the heating part are arranged in sequence along the first direction.

[0011] Further, the spraying direction of the first nozzle does not intersect with the extrusion direction of the heating portion; or, the spraying direction of the first nozzle intersects with the extrusion direction of the heating portion and the intersection is located below the heating portion.

[0012] Furthermore, the first nozzle is connected to the feeding part, the heating part or the heat insulation part.

[0013] Furthermore, the first nozzle is detachably connected to the heat insulation part.

[0014] Furthermore, an angle is formed between the spraying direction of the first nozzle and the extrusion direction of the heating portion, and the angle is adjustable.

[0015] Furthermore, the heating part includes a second nozzle, a temperature-isolating block and a heating ring; the heating ring is arranged outside the temperature-isolating block and is used to heat the temperature-isolating block; the temperature-isolating block is used to heat the consumables, and the temperature-isolating block has a consumable heating hole that passes through the temperature-isolating block; the second nozzle is connected to the lower end of the temperature-isolating block and is connected to the consumable heating hole, and is used to extrude the heated consumables.

[0016] Furthermore, at least one ridge structure for increasing the contact area between the temperature-isolating block and the consumable is formed on the hole wall of the consumable heating hole, and the ridge structure extends axially along the consumable heating hole.

[0017] Furthermore, the consumable heating hole is divided into a preheating hole section and a fully heating hole section in sequence from top to bottom, the radial cross-sectional area of the preheating hole section is larger than the radial cross-sectional area of the fully heating hole section, and the rib structure is arranged in the fully heating hole section.

[0018] Furthermore, the heat insulation part includes a throat pipe, a heat sink and a cooling fan; the throat pipe connects the feed part and the heating part, and is used to block the heat of the heating part from being conducted to the feed part; the heat sink is arranged outside the throat pipe, and is used to dissipate heat from the throat pipe; the cooling fan is used to dissipate heat from the heat sink.

[0019] Another technical solution of the present application is as follows: providing a 3D printer, comprising a 3D printing nozzle assembly as described in any of the above technical solutions.

[0020] The beneficial effect of the present application is that: a cooling part including a first nozzle is provided, and the first nozzle is used to spray a spray toward the extruded consumable material. The spray will adhere to the high-temperature consumable material and absorb heat through spray evaporation. Since the water-gas phase change has an extremely high heat exchange capacity, under the action of heat transfer mechanisms such as convection and boiling between the spray and the extruded consumable material, the cooling speed of the model can be greatly improved, thereby improving printing accuracy and shortening printing time, and it can be suitable for high-speed printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the 3D printing nozzle assembly according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the 3D printing nozzle assembly of the embodiment shown;

[0023] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the 3D printing nozzle assembly of the embodiment shown;

[0024] Figure 4 for Figure 1 Schematic diagram of the exploded structure of the 3D printing nozzle assembly of the embodiment shown;

[0025] Figure 5 This is a schematic diagram of the temperature equalizing block structure of an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the temperature equalizing block according to an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the structure of the 3D printing nozzle assembly according to an embodiment of the present application;

[0028] Figure 8 for Figure 7 Schematic diagram of the partial structure of the 3D printing nozzle assembly of the embodiment shown;

[0029] Figure 9 for Figure 7 A top view of the partial structure of the 3D printing nozzle assembly of the embodiment shown;

[0030] Figure 10 Schematic diagram of the projection of the first nozzle and the second nozzle on the printing platform according to an embodiment of the present application;

[0031] Among them: 1-feeding part (101-feeding pipe), 2-heating part (Y-extrusion direction of heating part, 201-second nozzle, 202-temperature block (2021-consumable heating hole (20211-preheating hole section, 20212-full heating hole section), 2022-edge structure), 203-heating ring, 204-temperature sensor, 205-silicone sleeve), 3-insulation part (301-throat (3011-upper section of the throat, 3012-neck of the throat, 3013 -lower section of the throat), 302-heat sink (3021-rotating shaft hole, 3022-arc hole), 303-cooling fan), 4-cooling part (401-first nozzle (X-spraying direction of the first nozzle), 402-first pipe, 403-second pipe, 404-mounting bracket (4041-first mounting arm, 4042-second mounting arm), 405-rotating shaft, 406-threaded part, 407-fastener, 408-screw), 5-consumables, 6-printing platform. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] Figure 1 and Figure 2 It is a schematic diagram of the structure of the 3D printing nozzle assembly of the embodiment of the present application. It should be noted that if there is substantially the same result, the 3D printing nozzle assembly of the present application is not based on Figure 1 and Figure 2 The structure shown is limited. Figure 1 and Figure 2 As shown, the 3D printing nozzle assembly mainly includes a feed part 1, a heating part 2, an insulation part 3 and a cooling part 4. Among them, the feed part 1 is used to transport the external consumables 5 into the 3D printing nozzle assembly. The heating part 2 is connected to the feed part 1, and is used to heat the consumables 5 from the feed part 1 to a molten state, and then extrude the consumables 5 heated to the molten state onto the printing platform 6. The insulation part 3 is arranged between the feed part 1 and the heating part 2. The insulation part 3 is used to block the heat of the heating part 2 from being conducted to the feed part 1. The insulation part 3 can prevent the occurrence of thermal creep of the consumables 5. The cooling part 4 includes a first nozzle 401, and the first nozzle 401 is used to spray spray toward the extruded consumables 5.

[0035] In the embodiment of the present application, the consumable material 5 is heated and melted by the 3D printing nozzle assembly and then extruded onto the printing platform 6. Then, under the action of the spray sprayed by the first nozzle 401, it is cooled and solidified into shape. Since the mist is composed of water, the boiling point is 100°C under normal pressure, and the melting point of the consumable material 5 is generally much higher than the boiling point of water under normal pressure, the spray collides with the surface of the high-temperature molten consumable material 5 and can quickly boil and absorb heat, greatly improving the heat transfer coefficient. Therefore, spray cooling has good forward-looking technical value in terms of rapid cooling. Under the action of heat transfer mechanisms such as convection and boiling between the spray and the extruded consumable, the cooling speed of the model can be greatly improved, thereby improving printing accuracy, shortening printing time, and improving the printing quality of details such as overhangs and bridges, which can adapt to the technical development direction of high-speed printing.

[0036] In a specific embodiment, the first nozzle 401 is an atomizing nozzle, please refer to Figures 1 to 4 The cooling unit 4 further includes a first pipe 402 and a second pipe 403. The first pipe 402 is used to deliver compressed air to the first nozzle 401, and the second pipe 403 is used to deliver water to the first nozzle 401. After the compressed air and water flow through the first nozzle 401, a fine spray is generated and sprayed toward the extruded consumable 5, rapidly cooling the consumable 5. The spray generated by the compressed air and water flow through the first nozzle 401 is more refined, and the droplets can be better spread throughout the extruded consumable 5 (model), making the cooling more uniform.

[0037] In some other embodiments, the cooling part 4 may also include an ultrasonic atomizing device that uses ultrasonic technology to atomize water, or the cooling part 4 may also include a hydraulic atomizing device that uses hydraulic technology to atomize water, as long as the first nozzle 401 can spray the spray and cool the consumables 5.

[0038] In some embodiments, in order to ensure the cooling effect of the consumable material 5 and avoid affecting the model forming and accuracy, please refer to Figure 2 The heated consumable material 5 is extruded onto the printing platform 6 along the first direction, and the first nozzle 401 and the heating part 2 are arranged in sequence along the first direction to ensure that the consumable material 5 is first extruded onto the printing platform 6, and then the spray is sprayed onto the consumable material 5.

[0039] In some embodiments, in order to ensure that the spray does not interfere with the heating and extrusion of the consumable 5, the spray direction X of the first nozzle 401 does not intersect with the extrusion direction Y of the heating unit 2. For example, the heating unit 2 includes a second nozzle 201 for extruding the consumable 5, and the axis of the first nozzle 401 does not intersect with the axis of the second nozzle 201. In a specific example, please refer to Figure 10 The cooling portion 4 includes two first nozzles 401 , and the two first nozzles 401 are symmetrically arranged with respect to the second nozzle 201 .

[0040] In other embodiments, in order to ensure that the spray does not interfere with the heating and extrusion of the consumable material 5, the spray direction X of the first nozzle 401 intersects with the extrusion direction Y of the heating unit 2, and the intersection of the spray direction X of the first nozzle 401 and the extrusion direction Y of the heating unit 2 is located below the heating unit 2. For example, the heating unit 2 includes a second nozzle 201 for extruding the consumable material 5, please refer to Figure 2, the axis of the first nozzle 401 and the axis of the second nozzle 201 intersect, but the intersection of the axis of the first nozzle 401 and the axis of the second nozzle 201 is located below the second nozzle 201. In some specific embodiments, the intersection of the axis of the first nozzle 401 and the axis of the second nozzle 201 can be located above the printing platform 6. In other specific embodiments, the intersection of the axis of the first nozzle 401 and the axis of the second nozzle 201 can be located on the printing platform 6. In some other specific embodiments, the intersection of the axis of the first nozzle 401 and the axis of the second nozzle 201 can be located below the printing platform 6, please refer to Figure 2 .

[0041] In some embodiments, the first nozzle 401 can be connected to the feed portion 1. In other embodiments, the first nozzle 401 can be connected to the heating portion 2. In still other embodiments, the first nozzle 401 can be connected to the insulation portion 3. In other embodiments, the first nozzle 401 can also be connected to other structures of the 3D printing nozzle assembly, as long as the first nozzle 401 can spray spray and cool the consumable 5. The connection methods of the first nozzle 401 and the 3D printing nozzle assembly include but are not limited to threaded connection, screw tightening, glue bonding, interference fit, etc., as long as the first nozzle 401 can spray spray and cool the consumable 5.

[0042] In some embodiments, in order to block the heating unit 2 and the first nozzle 401 and prevent the heat generated by the heating unit 2 from being transferred to the first nozzle 401, please refer to Figure 1 and Figure 2 , the first nozzle 401 is connected to the heat insulation part 3. In some more preferred embodiments, in order to facilitate installation and removal of the first nozzle 401, and replacement of the first nozzle 401, the first nozzle 401 and the heat insulation part 3 are detachably fixed.

[0043] In some embodiments, to facilitate installation of the first nozzle 401, please refer to Figures 1 to 4 The cooling unit 4 further includes a mounting bracket 404 connected to the 3D printing nozzle assembly, and the first nozzle 401 is fixed on the mounting bracket 404. In some specific embodiments, in order to block the heating unit 2 and the first nozzle 401 and prevent the heat generated by the heating unit 2 from being transferred to the first nozzle 401, please refer to Figures 1 to 4 , the mounting bracket 404 is connected to the heat insulation part 3. In a specific embodiment, in order to facilitate assembly and disassembly, please refer to Figure 2 , the mounting bracket 404 and the heat insulation part 3 are fixed by screws 408.

[0044] In some embodiments, an angle is formed between the ejection direction X of the first nozzle 401 and the extrusion direction Y of the heating unit 2, and the angle between the ejection direction X of the first nozzle 401 and the extrusion direction Y of the heating unit 2 is adjustable. For example, the heating unit 2 includes a second nozzle 201 for extruding the consumable material 5, and an angle is formed between the axis of the first nozzle 401 and the axis of the second nozzle 201, and the angle is adjustable.

[0045] In some specific embodiments, the cooling unit 4 further includes a rotating shaft 405 and cooperating threaded members 406 and fasteners 407. The mounting bracket 404 includes a first mounting arm 4041 and a second mounting arm 4042 spaced apart from each other, with the thermal insulation unit 3 being restrained between the first mounting arm 4041 and the second mounting arm 4042. The rotating shaft 405 is secured to the first and second mounting arms 4041 and 4042 at both ends, and the thermal insulation unit 3 is provided with a rotating shaft hole 3021 that mates with the rotating shaft 405. The threaded member 406 is secured to the first and second mounting arms 4041 and 4042 at both ends, and the thermal insulation unit 3 is provided with an arc-shaped hole 3022 that mates with the threaded member 406. Two fasteners 407 are threadedly connected to the threaded member 406 for tightening against the thermal insulation unit 3. After loosening one of the fasteners 407 tightening against the thermal insulation unit 3, the mounting bracket 404 can rotate relative to the thermal insulation unit 3 under the action of the rotating shaft 405. During relative rotation, the screw member 406 moves with the mounting bracket 404 in the arc-shaped hole 3022. After the rotation is completed, the previously loosened fasteners 407 are screwed so that the two fasteners 407 are pressed against the heat insulating part 3 at the same time. Under the cooperation of the two fasteners 407, the mounting bracket 404 and the heat insulating part 3 are relatively fixed and cannot rotate anymore. Please refer to Figures 7 to 9 .

[0046] In some embodiments, the fastener 407 may be a nut, and the threaded member 406 may have an external thread that matches the internal thread of the fastener 407. In other embodiments, the fastener 407 and the threaded member 406 may have other structures as long as they are easy to install and remove and can fix the mounting bracket 404 and the insulation part 3.

[0047] In some embodiments, the fixing methods for the ends of the rotating shaft 405 and the first mounting arm 4041 and the second mounting arm 4042 include, but are not limited to, threaded connection, screw fastening, gluing, interference fit, welding, etc. The fixing methods for the ends of the threaded member 406 and the first mounting arm 4041 and the second mounting arm 4042 include, but are not limited to, threaded connection, screw fastening, gluing, interference fit, welding, etc.

[0048] In some embodiments, see Figure 3 and Figure 4The heating part 2 includes a second nozzle 201, a temperature-equalizing block 202 and a heating ring 203. The heating ring 203 is sleeved on the outside of the temperature-equalizing block 202, and the heating ring 203 is used to heat the temperature-equalizing block 202. The temperature-equalizing block 202 is used to heat the consumable 5, and the temperature-equalizing block 202 has a consumable heating hole 2021 that passes through the temperature-equalizing block 202. The second nozzle 201 is connected to the lower end of the temperature-equalizing block 202 and is connected to the consumable heating hole 2021. The second nozzle 201 is used to extrude the heated consumable 5. Heat is generated by the heating ring 203, and the heat generated by the heating ring 203 is conducted to the temperature-equalizing block 202 and the second nozzle 201. After the temperature-equalizing block 202 is heated by the heat generated by the heating ring 203, the consumable 5 is heated to a molten state by the temperature-equalizing block 202 when passing through the consumable heating hole 2021 in the temperature-equalizing block 202, and then extruded onto the printing platform 6 through the second nozzle 201.

[0049] In some more specific embodiments, in order to ensure the heating effect of the consumable material 5, please refer to Figure 3 and Figure 4 The heating part 2 also includes a temperature sensor 204, which is used to collect a temperature signal from the temperature-averaging block 202 and transmit the temperature signal to an MCU (Microcontroller Unit, also known as a single-chip microcomputer (Single Chip Microcomputer, or single-chip microcomputer)) or a CPU (Central Processing Unit, Central Processing Unit) for PID regulation (PID regulation, a basic control method of the control system in classical control theory, a linear regulation law with proportional, integral and differential effects, PID (Proportional Integral Derive)) to control the temperature of the temperature-averaging block 202 near a preset value.

[0050] For more specific implementations, please refer to Figures 1 to 4 The heating part 2 also includes a silicone sleeve 205, which wraps the temperature equalizing block 202, the heating ring 203, the temperature sensor 204 and the upper half of the second nozzle 201, and has a good heat preservation effect, preventing the heat generated by the heating part 2 from diffusing outward and affecting the ambient temperature and the heating effect on the consumables 5.

[0051] In other embodiments, the heating portion 2 may also be other structures, as long as it is ensured that the heating portion 2 can heat the consumable material 5 to a molten state and extrude the heated consumable material 5 .

[0052] In some embodiments, see Figure 5 and Figure 6At least one ridge structure 2022 is formed on the hole wall of the consumable heating hole 2021. The ridge structure 2022 is used to increase the contact area between the temperature equalizing block 202 and the consumable 5 to ensure that the consumable 5 can be heated more fully. The ridge structure 2022 extends axially along the consumable heating hole 2021.

[0053] For more specific implementations, please refer to Figure 5 and Figure 6 A plurality of ridge structures 2022 are formed on the hole wall of the consumable heating hole 2021. The ridge structures 2022 are evenly spaced in the consumable heating hole 2021, which can further ensure the contact area between the temperature equalizing block 202 and the consumable 5, and further ensure that the consumable 5 entering the consumable heating hole 2021 can be evenly heated.

[0054] In some specific embodiments, the consumable heating hole 2021 is sequentially divided from top to bottom into a preheating hole section 20211 and a full-heating hole section 20212. To facilitate entry of the consumable 5 into the consumable heating hole 2021, the preheating hole section 20211 is not provided with a rib structure 2022, while the rib structure 2022 is provided in the full-heating hole section 20212. Because the preheating hole section 20211 is not provided with a rib structure 2022, the radial cross-sectional area of the preheating hole section 20211 is larger than the radial cross-sectional area of the full-heating hole section 20212. Because the full-heating hole section 20212 is provided with a rib structure 2022, the contact area between the full-heating hole section 20212 and the consumable 5 is larger than the contact area between the preheating hole section 20211 and the consumable 5. The rib structure 2022 not only does not affect the speed at which the consumable material 5 enters the consumable material heating hole 2021, but also ensures that the consumable material 5 in the consumable material heating hole 2021 can be fully heated to a molten state. Figure 5 .

[0055] In a specific embodiment, the axial length of the preheating hole section 20211 is shorter than the axial length of the fully heating hole section 20212, which can ensure that the rib structure 2022 does not affect the speed at which the consumable 5 enters the consumable heating hole 2021, and can also ensure that the consumable 5 entering the consumable heating hole 2021 is more fully heated to a molten state.

[0056] In some embodiments, see Figure 3 and Figure 4The heat-insulating portion 3 includes a throat 301, a heat sink 302 and a cooling fan 303. The throat 301 connects the feed portion 1 and the heating portion 2, and is used to prevent the heat from the heating portion 2 from being conducted to the feed portion 1. The heat sink 302 is sleeved on the outside of the throat 301, and is used to dissipate heat from the throat 301. The cooling fan 303 is used to dissipate heat from the heat sink 302. The incoming direction of the temperature-equalizing block 202, i.e., the feeding direction, is insulated by the throat 301. The throat 301 is made of a low thermal conductivity, high strength material. A feeding hole is provided on the throat 301, which passes through the throat 301. The feeding hole is used to connect the feed portion 1 and the consumable heating hole 2021 of the temperature-equalizing block 202. A heat sink 302 is connected to the other side of the throat 301 . The heat sink 302 absorbs the heat conducted from the throat 301 and dissipates the heat under the convection condition formed by the cooling fan 303 , which can effectively prevent the consumables 5 from thermal creep.

[0057] In some specific embodiments, the mounting bracket 404 can rotate relative to the heat sink 302 to adjust the angle between the spray direction X of the first nozzle 401 and the extrusion direction Y of the heating part 2. Figure 8 The heat sink 302 is provided with a shaft hole 3021 that engages with the shaft 405. The heat sink 302 is also provided with an arc-shaped hole 3022 that engages with the screw member 406. Two fasteners 407 are used to tighten the heat sink 302. After loosening one of the fasteners 407 that tightens the heat sink 302, the mounting bracket 404 can rotate relative to the heat sink 302 under the action of the shaft 405. During relative rotation, the screw member 406 moves within the arc-shaped hole 3022 along with the mounting bracket 404. After the rotation is completed, the previously loosened fastener 407 is tightened so that both fasteners 407 are simultaneously tightened against the heat sink 302. With the cooperation of the two fasteners 407, the mounting bracket 404 and the heat sink 302 are relatively fixed and cannot rotate further.

[0058] In other specific embodiments, please refer to Figure 2 The heat sink 302 is fixed to the mounting bracket 404 by screws 408. The mounting bracket 404 cannot rotate relative to the heat sink 302. The angle between the injection direction X of the first nozzle 401 and the extrusion direction Y of the heating part 2 cannot be adjusted.

[0059] In some specific embodiments, to ensure thermal insulation, the throat pipe 301 includes, from top to bottom, an upper section 3011, a neck section 3012, and a lower section 3013. The outer diameter of the neck section 3012 of the throat pipe 301 is smaller than the outer diameters of the upper section 3011 and the lower section 3013 of the throat pipe 301. The upper section 3011 of the throat pipe 301 is sheathed within the heat sink 302, and the lower section 3013 of the throat pipe 301 is sheathed within the temperature-isolating block 202.

[0060] In some specific embodiments, in order to facilitate the connection between the heating part 2 and the heat insulating part 3, the temperature equalizing block 202 and the heat sink 302 can be connected by threaded fasteners, which has a simple structure and is easy to assemble and disassemble.

[0061] As an example, the threaded fastener may be a screw, which may be made of a material with low thermal conductivity and high strength.

[0062] In other embodiments, the insulation part 3 may also be other structures, and the heating part 2 and the insulation part 3 may also be connected in other ways, as long as the insulation part 3 can prevent the heat of the heating part 2 from being transferred to the feeding part 1.

[0063] In some embodiments, the feed portion 1 includes a feed pipe 101 . The lower end of the feed pipe 101 is sleeved within the heat sink 302 and communicates with the throat pipe 301 .

[0064] The 3D printing nozzle assembly provided in the embodiment of the present application is provided with a cooling portion 4 including a first nozzle 401. The first nozzle 401 is used to spray a spray toward the extruded consumable 5. The spray will adhere to the high-temperature consumable 5 and absorb heat through spray evaporation. Since the water-gas phase change has an extremely high heat exchange capacity, under the action of heat transfer mechanisms such as convection and boiling between the spray and the extruded consumable 5, the cooling speed of the model can be greatly improved, and the printing quality of details such as overhangs and bridges can be improved, which can adapt to the technical development direction of high-speed printing.

[0065] An embodiment of the present application further provides a 3D printer, comprising the 3D printing nozzle assembly as described in any of the above embodiments.

[0066] 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.

[0067] 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. 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. 3D printing nozzle assembly, characterized in that: include: Feeding section, used for conveying consumables; a heating portion, connected to the feeding portion, for heating the consumables from the feeding portion and extruding the heated consumables; a heat insulating portion, provided between the feeding portion and the heating portion, for preventing heat from the heating portion from being transferred to the feeding portion; and The cooling portion includes a first nozzle, wherein the first nozzle is used to spray spray toward the extruded consumable material to cool the extruded consumable material.

2. The 3D printing nozzle assembly according to claim 1, wherein: The heated consumable material is extruded onto the printing platform along a first direction, and the first nozzle and the heating part are sequentially arranged along the first direction.

3. The 3D printing nozzle assembly according to claim 1, wherein: The spraying direction of the first nozzle does not intersect with the extrusion direction of the heating portion; or, the spraying direction of the first nozzle intersects with the extrusion direction of the heating portion and the intersection is located below the heating portion.

4. The 3D printing nozzle assembly according to claim 1, wherein: The first nozzle is connected to the feeding part, the heating part or the heat insulating part.

5. The 3D printing nozzle assembly according to claim 4, wherein: The first nozzle is detachably connected to the heat insulation part.

6. The 3D printing nozzle assembly according to claim 1, wherein: An included angle is formed between the spraying direction of the first nozzle and the extrusion direction of the heating portion, and the angle is adjustable.

7. The 3D printing nozzle assembly according to claim 1, wherein: The heating part includes a second nozzle, a temperature-equalizing block and a heating ring; the heating ring is arranged outside the temperature-equalizing block and is used to heat the temperature-equalizing block; the temperature-equalizing block is used to heat the consumables, and the temperature-equalizing block has a consumable heating hole that passes through the temperature-equalizing block; the second nozzle is connected to the lower end of the temperature-equalizing block and is connected to the consumable heating hole, and is used to extrude the heated consumables.

8. The 3D printing nozzle assembly according to claim 7, wherein: At least one ridge structure for increasing the contact area between the temperature-isolating block and the consumable is formed on the hole wall of the consumable heating hole, and the ridge structure extends axially along the consumable heating hole.

9. The 3D printing nozzle assembly according to claim 8, wherein: The consumable heating hole is divided into a preheating hole section and a fully heating hole section in sequence from top to bottom. The radial cross-sectional area of the preheating hole section is larger than the radial cross-sectional area of the fully heating hole section, and the rib structure is arranged in the fully heating hole section.

10. The 3D printing nozzle assembly according to claim 1, wherein: The heat insulation part includes a throat pipe, a heat sink and a cooling fan; the throat pipe connects the feeding part and the heating part, and is used to prevent the heat of the heating part from being transferred to the feeding part; the heat sink is arranged outside the throat pipe, and is used to dissipate heat from the throat pipe; the cooling fan is used to dissipate heat from the heat sink.

11. A 3D printer, characterized in that It includes the 3D printing nozzle assembly according to any one of claims 1 to 10.

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