Melting device, nozzle assembly and 3D printer

Abstract

The utility model provides a melting device, a nozzle assembly and a 3D printer, and belongs to the technical field of 3D printing. The melting device comprises a heating part and a cooling part; the heating part is provided with a first channel penetrating through the heating part, the heating part is provided with a first mounting channel used for mounting a heater, and the first mounting channel and the first channel are arranged at an interval; and the cooling part is connected with the heating part so as to reduce the temperature of the consumables flowing out of the heating part. According to the melting device, the cooling part is arranged at one end of the heating part to reduce the temperature of the consumables flowing out of the heating part, so that the temperature of the heating part can be increased, the consumables are quickly in a softened flowing state in the first channel, the requirement for quick melting of the consumables can be met, and the melting efficiency is improved. And in addition, the model forming quality during consumable printing can be improved.

Description

Technical Field

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

[0002] With the increasingly mature development of 3D printing technology, the speed of 3D printers is also continuously increasing. In order to meet the requirements of high-speed and high-quality printing effects, the traditional melting technology of nozzles can no longer meet the needs of high-speed printing.

[0003] Due to the high temperature requirement for melting the consumables, during the heating process of the consumables by the existing heating device, the temperature of the consumables flowing out of the nozzle after melting is very high. The printed effect is poor after the melted consumables flow out of the nozzle again, resulting in the collapse and deformation of the model. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and provide a melting device, a nozzle assembly, and a 3D printer.

[0005] In a first aspect, this application provides a melting device, including:

[0006] A heating part, provided with a first channel penetrating through the heating part, the heating part is provided with a first installation channel for installing a heater, and the first installation channel and the first channel are arranged at intervals;

[0007] A temperature reduction part, the temperature reduction part is connected to the heating part to reduce the temperature of the consumables flowing out of the heating part.

[0008] In some embodiments, the temperature reduction part is a thermostat, and the temperature of the thermostat is lower than the temperature of the heating part.

[0009] In some embodiments, the temperature reduction part includes a connecting part and at least one heat dissipation part, the connecting part is connected to the heating part, and the heat dissipation part is at least arranged on one side of the connecting part.

[0010] In some embodiments, the temperature reduction part is provided with a second channel penetrating through the temperature reduction part, and the second channel and the first channel are communicated to form a diversion channel.

[0011] In some embodiments, the axis of the first channel coincides with the axis of the second channel.

[0012] In some embodiments, the melting device includes a heat dissipation structure, and the heat dissipation structure includes a connecting rod and a fan;

[0013] One end of the connecting rod is connected to the fan, and the other end of the connecting rod is arranged between adjacent heat dissipation parts.

[0014] In some embodiments, a heat dissipation channel is defined between adjacent ones of the heat dissipation members, and the air inlet of the fan faces the heat dissipation channel.

[0015] In some embodiments, the heat dissipation structure further includes a heat insulation member sleeved on the connecting rod, and the heat insulation member is disposed between the fan and the temperature reduction portion.

[0016] In a second aspect, some embodiments of the present application provide a nozzle assembly, including a nozzle, a heater, and the melting device as described above;

[0017] The heater is disposed in the first installation channel, the nozzle is disposed on a side of the temperature reduction portion away from the heating portion, and the nozzle is provided with a third channel communicating with the temperature reduction portion.

[0018] In some embodiments, the melting device is provided with a second installation channel, and the nozzle assembly further includes a temperature sensor disposed in the second installation channel.

[0019] In a third aspect, some embodiments of the present application provide a 3D printer, including the melting device or the nozzle assembly as described above.

[0020] The embodiments of the present application have the following advantages: By providing a temperature reduction portion at one end of the heating portion to reduce the temperature of the consumable flowing out of the heating portion, when the consumable enters the first channel of the heating portion, in order to fully melt the consumable in the heating portion, the temperature of the heating portion can be appropriately increased, so that the consumable quickly reaches a softened flow state; when the softened and melted consumable enters the second channel of the temperature reduction portion, the temperature reduction portion can absorb the heat of the melted consumable, thereby reducing the temperature of the consumable, so that the temperature of the consumable discharged from the second channel of the temperature reduction portion is controlled within a preset flow temperature range, which can not only meet the requirement for quickly melting the consumable, but also improve the model forming quality during printing of the consumable.

[0021] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1The structural schematic diagram of a perspective view of a melting device provided by some embodiments of the present utility model is shown;

[0024] Figure 2 The structural schematic diagram of another perspective view of a melting device provided by some embodiments of the present utility model is shown;

[0025] Figure 3 is shown Figure 2 The cross-sectional view of part A-A in

[0026] Figure 4 The structural schematic diagram of a perspective view of other embodiments of a melting device provided by some embodiments of the present utility model is shown;

[0027] Figure 5 The structural schematic diagram of a perspective view of a nozzle assembly provided by some embodiments of the present utility model is shown;

[0028] Figure 6 The structural schematic diagram of another perspective view of a nozzle assembly provided by some embodiments of the present utility model is shown;

[0029] Figure 7 is shown Figure 6 The cross-sectional view of part B-B in

[0030] Figure 8 The structural schematic diagram of a perspective view of other embodiments of a melting device provided by some embodiments of the present utility model is shown;

[0031] Figure 9 is shown Figure 8 The cross-sectional view of part C-C in

[0032] Description of main element symbols:

[0033] 100 - Melting device; 110 - Heating part; 111 - First channel; 112 - First installation channel; 113 - Second installation channel; 120 - Cooling part; 121 - Connection part; 122 - Heat dissipation part; 123 - Second channel; 130 - Diversion channel; 200 - Heat dissipation structure; 210 - Connecting rod; 220 - Heat insulation part; 230 - Fan; 300 - Nozzle; 310 - Third channel; 400 - Heater; 500 - Temperature sensor. Detailed description of specific embodiments

[0034] The embodiments of the present application are described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings below are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0035] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes.

[0036] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically and clearly defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] As Figures 1 to 3 shown, some embodiments of this application provide a melting device 100, which is mainly applied to the nozzle 300 assembly and 3D printer, and can adjust the temperature of the consumable after melting through the melting device 100, avoiding the temperature of the printed model being too high, resulting in the collapse and deformation of the model, thereby ensuring the printing quality.

[0040] The melting device 100 includes a heating part 110 and a cooling part 120. Among them, the connection method between the heating part 110 and the cooling part 120 includes any one of threaded connection, snap connection, bolt connection, welding or integral molding, and can be specifically set according to the actual situation.

[0041] In this embodiment, the heating part 110 and the cooling part 120 are connected by an integral molding method to form a melting device 100, improving the connection stability between the heating part 110 and the cooling part 120.

[0042] Among them, the heating part 110 is provided with a first channel 111 passing through the heating part 110, so that the consumables entering the first channel 111 can be heated and melted by the heating part 110. In addition, the heating part 110 is provided with a first installation channel 112 for installing the heater 400, and the first installation channel 112 and the first channel 111 are arranged at intervals.

[0043] It can be understood that by installing the heater 400 in the first installation channel 112, when the heater 400 forms an electrical connection with an external power supply, the temperature of the heater 400 rises and generates a large amount of heat, and the heat can be transferred to the melting device 100 through the channel wall of the first installation channel 112, and the temperature of the melting device 100 rises, so that the temperature of the channel wall of the first channel 111 rises, and the consumables are heated and melted through the channel wall of the first channel 111.

[0044] By adjusting the temperature of the heater 400, the temperature of the melting device 100 is adjusted, so as to control the melting speed of the consumables by the channel wall of the first channel 111, thereby adjusting the flow speed of the consumables in the first channel 111 to meet different requirements for the printing speed.

[0045] In addition, the cooling part 120 is connected to the heating part 110 to reduce the temperature of the consumables flowing out of the heating part 110 through the cooling part 120. Among them, the connection method between the cooling part 120 and the heating part 110 includes at least any one of screw connection, bolt connection, clamping connection, welding or integral molding, which can be specifically set according to the actual situation.

[0046] It should be noted that the cooling part 120 is arranged at the outlet end of the heating part 110 to cool and dissipate heat from the consumables heated by the heating part 110, so as to control the temperature of the consumables and avoid the too high temperature of the consumables during the printing process, thereby ensuring the printing quality.

[0047] As Figure 8 and Figure 9 shown, in some embodiments of the present invention, the cooling part 120 is a thermostat. It can be understood that the user can adjust the temperature of the thermostat, so as to adjust the temperature of the consumables discharged from the cooling part 120 to meet the user's printing needs and ensure the printing quality.

[0048] Specifically, the temperature of the thermostat is lower than that of the heating unit 110. The temperature of the thermostat can be specifically set according to the actual situation so as to set the temperature of the thermostat at a preset temperature. It can be understood that since the temperature of the thermostat is lower than that of the heating unit 110, when the consumable heated by the heating unit 110 enters the second channel 123, at this time, the temperature of the consumable entering the second channel 123 is higher than that of the thermostat, so that the consumable can transfer heat to the thermostat, thereby realizing the heat dissipation effect on the consumable. In addition, since the temperature of the thermostat is set at a preset value, the temperature of the consumable entering the second channel 123 will not be lower than the temperature of the thermostat. Therefore, the thermostat can also provide a heat preservation effect on the consumable, so that the temperature of the consumable discharged from the second channel 123 is maintained at the preset temperature value, thereby improving the accuracy of the temperature control of the consumable and ensuring the printing quality.

[0049] As Figure 1 shown, in some embodiments of the present invention, the cooling unit 120 includes a connecting portion 121 and at least one heat dissipating member 122. It can be understood that the number of the heat dissipating members 122 can be any value of one or more, and can be specifically set according to the actual situation.

[0050] In this embodiment, the heat dissipating member 122 is at least disposed on one side of the connecting portion 121. It should be noted that the connection manner between the connecting portion 121 and the heat dissipating member 122 includes at least any one of screw connection, bolt connection, snap connection, welding or integral molding, and can be specifically set according to the actual situation.

[0051] Exemplarily, the heat dissipating member 122 and the connecting portion 121 are connected in a detachable manner, so as to facilitate adjusting the number of the heat dissipating members 122 connected to the connecting portion 121, thereby adjusting the heat dissipation efficiency of the heat dissipating members 122 to meet different user requirements for heat dissipation.

[0052] In this embodiment, the connecting portion 121 and the heat dissipating member 122 are connected by integral molding to form the cooling unit 120, so as to ensure the overall strength of the cooling unit 120 and the heat conduction efficiency of the cooling unit 120.

[0053] As Figure 1 and Figure 3 shown, in some embodiments, a plurality of heat dissipating members 122 are provided on the side wall of the connecting portion 121, and the plurality of heat dissipating members 122 are arranged at intervals on the outer periphery of the connecting portion 121, so as to absorb the heat generated by the connecting portion 121 through the heat dissipating members 122 and dissipate heat through the interval between two adjacent heat dissipating members 122, thereby achieving the purpose of reducing the temperature of the connecting portion 121.

[0054] It can be understood that by increasing the number of heat dissipation members 122, the heat dissipation efficiency of the connection portion 121 can be improved.

[0055] As Figure 3 shown, in some embodiments, the temperature reduction portion 120 is provided with a second channel 123 penetrating through the temperature reduction portion 120. The second channel 123 and the first channel 111 are connected to form a diversion channel 130, so that after the consumable is heated and melted by the channel wall of the first channel 111, the melted consumable enters the second channel 123 and can be discharged from one end of the second channel 123 facing away from the first channel 111.

[0056] It should be noted that by providing a plurality of spaced-apart heat dissipation members 122 on the outer periphery of the connection portion 121, the connection portion 121 is dissipated by the heat dissipation members 122, so as to reduce the overall temperature of the temperature reduction portion 120, thereby reducing the temperature of the channel wall of the second channel 123. When the melted consumable enters the second channel 123, the temperature of the consumable is higher than the temperature of the channel wall of the second channel 123. Thus, the channel wall of the second channel 123 can absorb the heat of the consumable, that is, heat conduction is formed between the consumable and the channel wall of the second channel 123, thereby reducing the temperature of the consumable in the second channel 123.

[0057] In this embodiment, by designing the temperature reduction portion 120 into a heat sink structure, the temperature of the heating portion 110 can be appropriately increased, so that when the consumable enters the first channel 111, it can be quickly melted at the high temperature of the heating portion 110, so that the consumable is quickly in a softened and flowing state; when the softened and melted consumable enters the second channel 123, the heat of the melted consumable can be absorbed by the channel wall of the second channel 123, thereby reducing the temperature of the consumable and controlling the temperature of the consumable when it is discharged from the second channel 123 within a preset flow temperature range, which can not only meet the requirement of quickly melting the consumable, but also improve the model forming quality during the printing of the consumable.

[0058] It should be noted that the heat dissipation member 122 can be any one of a heat sink, a heat dissipation plate, a heat dissipation strip, a heat dissipation block, and a heat dissipation ring, and can be specifically set according to actual conditions.

[0059] In some embodiments of the present application, a plurality of the heat dissipation members 122 are at least provided on one side of the connection portion 121. It can be understood that a plurality of heat dissipation members 122 can be provided on the same side of the connection portion 121, or a plurality of heat dissipation members 122 can be provided on two sides or multiple sides of the connection portion 121, and can be specifically set according to actual conditions.

[0060] In this embodiment, multiple heat dissipation members 122 are arranged along the axial direction of the second channel 123. Further, the multiple heat dissipation members 122 are arranged at equal intervals along the axial direction of the second channel 123 to ensure the uniformity of heat dissipation of each part of the connecting portion 121 by the multiple heat dissipation fins, thereby ensuring the uniformity of temperature change in each area of the connecting portion 121, that is, improving the uniformity of temperature change of the channel wall of the second channel 123, so that during the process of the consumable flowing in the second channel 123, the uniformity of temperature change of the consumable is improved, thereby ensuring the printing quality.

[0061] As Figure 1 and Figure 3 shown, in some embodiments of the present application, along the direction perpendicular to the axis of the first channel 111, multiple heat dissipation members 122 are arranged on two opposite sides of the connecting portion 121.

[0062] In this embodiment, the number of heat dissipation members 122 arranged on two opposite sides of the connecting portion 121 is equal to further improve the heat dissipation efficiency of the connecting portion 121, and at the same time ensure the uniformity of heat dissipation of the outer periphery of the connecting portion 121 by the heat dissipation members 122, avoiding the situation of temperature difference in different areas of the outer periphery of the connecting portion 121, thereby ensuring the uniformity of temperature change in each area of the connecting portion 121, so as to ensure the uniformity of temperature control of the consumable entering the second channel 123, so as to improve the uniformity of the temperature of the consumable discharged from the second channel 123, thereby improving the forming quality of the model during printing.

[0063] In some embodiments of the present application, the heat dissipation member 122 surrounds the connecting portion 121.

[0064] It can be understood that the heat dissipation member 122 is sleeved on the connecting portion 121 to dissipate heat from the outer periphery of the connecting portion 121 through the heat dissipation member 122, and by increasing the contact area between the heat dissipation member 122 and the connecting portion 121, the heat conduction efficiency between the heat dissipation member 122 and the connecting portion 121 is improved, so as to further improve the heat dissipation efficiency of the heat dissipation member 122 for the connecting portion 121, thereby improving the heat dissipation efficiency of the cooling portion 120.

[0065] As Figure 2 and Figure 3 shown, in some embodiments of the present application, the axis of the first channel 111 coincides with the axis of the second channel 123, and the aperture of the first channel 111 is equal to the aperture of the second channel 123 to ensure the smoothness and stability of the consumable entering the second channel 123 through the first channel 111.

[0066] As Figure 4 shown, in some embodiments of the present application, the melting device 100 includes a heat dissipation structure 200, and the heat dissipation structure 200 includes a connecting rod 210 and a fan 230.

[0067] One end of the connecting rod 210 is connected to the fan 230, and the other end of the connecting rod 210 is disposed between two adjacent heat dissipation members 122, so that the fan 230 is connected to the cooling part 120 through the connecting rod 210.

[0068] In this embodiment, a heat dissipation channel is defined between two adjacent heat dissipation members 122, and the air inlet of the fan 230 faces the heat dissipation channel, so that during the operation of the fan 230, the air circulation rate around the cooling part 120 can be increased, so that the gas outside the gas flows through the heat dissipation channel, enters the fan 230 through the air inlet of the fan 230, and is discharged from the air outlet of the fan 230 to form an air flow channel, thereby taking away the heat dissipated by the heat dissipation member 122 through the gas to ensure the heat dissipation quality of the heat dissipation member 122, thereby improving the quality of temperature control of the cooling part 120 to ensure the stability of the temperature adjustment of the consumables entering the second channel 123.

[0069] It should be noted that the connection manner between the connecting rod 210 and the heat dissipation member 122 includes at least one of snap connection and threaded connection, and can be specifically set according to actual situations.

[0070] In this embodiment, the connecting rod 210 is a screw rod, that is, the fan 230 and the heat dissipation member 122 are threadedly connected through the connecting rod 210, so as to improve the connection stability between the fan 230 and the cooling part 120 while improving the installation or disassembly efficiency between the fan 230 and the cooling part 120, so as to facilitate maintenance or replacement.

[0071] In addition, the heat dissipation structure 200 further includes a heat insulation member 220, the heat insulation member 220 is sleeved on the connecting rod 210, and the heat insulation member 220 is disposed between the fan 230 and the cooling part 120, so as to form an adiabatic barrier between the fan 230 and the cooling part 120 through the heat insulation member 220 to prevent the fan 230 from directly contacting the cooling part 120 and avoid burning the fan 230.

[0072] Among them, the heat insulation member 220 can be a heat insulation block or a heat insulation ring.

[0073] Such as Figures 5 to 7 As shown, some embodiments of the present application provide a nozzle 300 assembly, including a nozzle 300, a heater 400, and the melting device 100 described above.

[0074] Among them, the heater 400 is disposed in the first installation channel 112. Specifically, the heater 400 is connected to the inner wall of the first installation channel 112.

[0075] In addition, the connection method between the heater 400 and the inner wall of the first installation channel 112 includes any one of snap connection, threaded connection, and bolt connection, which can be specifically set according to the actual situation.

[0076] Specifically, in this embodiment, a first connection hole communicating with the first installation channel 112 is provided on the side wall of the melting device 100. A first connecting member is provided in the first connection hole. One side of the first connecting member facing the first installation channel 112 is connected to the heater 400, so as to fix the heater 400 in the first installation channel 112 through the first connecting member, thereby ensuring the stability of the heater 400 in the first installation channel 112 and improving the stability of the connection between the heater 400 and the melting device 100.

[0077] It should be noted that the nozzle 300 is arranged on the side of the cooling part 120 away from the heating part 110. The nozzle 300 is provided with a third channel 310 communicating with the cooling part 120, that is, the third channel 310 and the second channel 123 are communicated, so that the consumables discharged through the second channel 123 enter the third channel 310 and are discharged from the third channel 310 (that is, discharged from the nozzle 300) to achieve printing.

[0078] As Figure 7 shown, in some embodiments of the present application, the melting device 100 is provided with a second installation channel 113. There is a gap between the second installation channel 113 and the first channel 111, and the second installation channel 113 and the first installation channel 112 are respectively located on two opposite sides of the first channel 111.

[0079] Among them, the nozzle 300 assembly further includes a temperature sensor 500. The temperature sensor 500 is arranged in the second installation channel 113 to detect the temperature change of the heating part 110 through the temperature sensor 500, so as to adjust the temperature of the heating part 110 according to the detected data, thereby adjusting the melting speed of the consumables.

[0080] Specifically, in this embodiment, a second connection hole communicating with the second installation channel 113 is provided on the side wall of the melting device 100. A second connecting member is provided in the second connection hole. One side of the second connecting member facing the second installation channel 113 is connected to the temperature sensor 500, so as to fix the temperature sensor 500 in the second installation channel 113 through the second connecting member, thereby ensuring the stability of the temperature sensor 500 in the second installation channel 113 and improving the stability of the connection between the temperature sensor 500 and the melting device 100.

[0081] Since the heater 400 is in direct contact with the inner wall of the first installation channel 112, that is, the heater 400 directly transfers heat to the inner wall of the first installation channel 112, and transfers the heat to other areas of the heating part 110 through the inner wall of the first installation channel 112. Based on this, in this embodiment, along the direction perpendicular to the axis of the first channel 111, the heater 400 and the temperature sensor 500 are respectively arranged on two opposite sides of the first channel 111, so that the temperature sensor 500 is arranged at one end of the heating part 110 away from the heater 400, so as to avoid the temperature sensor 500 directly contacting the heater 400, thereby improving the accuracy of the temperature detection of the heating part 110 by the temperature sensor 500.

[0082] In addition, some embodiments of the present application further provide a 3D printer, including the melting device 100 described in any one of the above embodiments or the nozzle 300 assembly described in any one of the above embodiments.

[0083] The 3D printer has the structure of the melting device 100 described in any one of the above embodiments and the beneficial effects brought by it; or the 3D printer has the structure of the nozzle 300 assembly described in any one of the above embodiments and the beneficial effects brought by it, which will not be elaborated here one by one.

[0084] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0085] It should be noted that: like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0086] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but should not be construed as a limitation to the scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A melting device, characterized in that, include: A heating part, provided with a first channel running through the heating part, the heating part is provided with a first installation channel for installing a heater, the first installation channel and the first channel are arranged at intervals; A cooling unit is connected to the heating unit to reduce the temperature of the consumables flowing out of the heating unit.

2. The melting device according to claim 1, characterized in that, The temperature-lowering unit is a thermostat, and the temperature of the thermostat is lower than the temperature of the heating unit.

3. The melting device according to claim 1, characterized in that, The cooling part includes a connecting part and at least one heat sink, the connecting part is connected to the heating part, and the heat sink is at least arranged on one side of the connecting part.

4. The melting device according to any one of claims 1 to 3, characterized in that The cooling portion is provided with a second channel penetrating the cooling portion, and the second channel is connected to the first channel to form a guide channel.

5. The melting device according to claim 4, characterized in that, The axis of the first channel coincides with the axis of the second channel.

6. The melting device according to claim 3, characterized in that, The melting device comprises a heat dissipation structure, and the heat dissipation structure comprises a connecting rod and a fan; One end of the connecting rod is connected to the fan, and the other end of the connecting rod is arranged between adjacent heat sinks.

7. The melting device according to claim 6, characterized in that A heat dissipation channel is defined between adjacent heat dissipation elements, and an air inlet of the fan faces the heat dissipation channel.

8. The melting device according to claim 6, wherein, The heat dissipation structure further includes a heat insulating member, which is sleeved on the connecting rod and arranged between the fan and the cooling part.

9. A nozzle assembly, characterized in that, A melting device comprising a nozzle, a heater and any one of claims 1 to 8; The heater is arranged in the first installation channel, the nozzle is arranged at a side of the cooling portion away from the heating portion, and the nozzle is provided with a third channel communicating with the cooling portion.

10. The nozzle assembly according to claim 9, characterized in that, The melting device is provided with a second installation channel, and the nozzle assembly further comprises a temperature sensor, and the temperature sensor is arranged in the second installation channel.

11. A 3D printer, characterized in that, The invention comprises the melting device according to any one of claims 1 to 8 or the nozzle assembly according to any one of claims 9 to 10.

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