Melting device

Abstract

The application relates to a melting device. The melting device comprises a heat conduction member and a heat source member. The heat conduction member comprises a first flow channel and a second flow channel arranged in sequence along a consumable conveying direction. The second flow channel is in communication with the first flow channel, and the cross-sectional area of the inlet of the second flow channel is larger than that of the outlet of the first flow channel. The heat source member is sleeved on the heat conduction member to heat the heat conduction member. In the application, the heat source member is sleeved on the heat conduction member to heat the heat conduction member, so that the consumable entering the second flow channel through the first flow channel becomes high-elasticity. Since the cross-sectional area of the inlet of the second flow channel is larger than that of the outlet of the first flow channel, the flow resistance of the high-elasticity consumable can be reduced, and the flow of the consumable is improved, so as to meet the demand for melting of the consumable in high-speed printing.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and in particular to melting apparatus. Background Technology

[0002] As 3D printing technology matures, the speed of 3D printers continues to increase. The melting speed of printing materials by traditional nozzles can no longer meet the needs of high-speed printing.

[0003] Current technologies often employ increasing the flow channel length within the nozzle to extend the residence time of the filament within the flow channel, thereby promoting more complete melting of the filament and increasing flow rate. However, since filaments are typically made of polymer materials with high viscosity, increasing the flow channel length significantly increases flow resistance, and the effect of increasing the printing filament flow rate is limited, failing to meet the demands of high-speed printing for filament melting. Utility Model Content

[0004] Therefore, it is necessary to provide a melting device to address the problem that existing consumables have limited flow rate improvement effects within the flow channel and cannot meet the melting requirements of consumables during high-speed printing.

[0005] A melting apparatus, comprising:

[0006] A heat-conducting component, comprising a first flow channel and a second flow channel arranged sequentially along the consumable conveying direction, wherein the second flow channel is connected to the first flow channel and the cross-sectional area of ​​the inlet of the second flow channel is larger than the cross-sectional area of ​​the outlet of the first flow channel.

[0007] A heat source component is fitted onto the heat-conducting component to heat the heat-conducting component.

[0008] In one embodiment, the first flow channel includes at least two first bypass channels and a first main channel. Each of the first bypass channels is circumferentially spaced around the first main channel and communicates with the first main channel. The inner wall of the first main channel is provided with a limiting portion in the area between any two adjacent first bypass channels.

[0009] In one embodiment, the diameter of the inscribed circle enclosed by each of the limiting portions corresponding to the outlet of the first main channel is smaller than the diameter of the inscribed circle enclosed by each of the limiting portions corresponding to the inlet of the first main channel.

[0010] In one embodiment, in the consumable delivery direction, the limiting portion includes at least one step, such that the diameter of the inscribed circle enclosed by the limiting portion gradually decreases.

[0011] In one embodiment, the inner contour circumference of the second flow channel is greater than the inner contour circumference of the first flow channel.

[0012] In one embodiment, the heat source component includes a first heat source part and a second heat source part, which are sequentially sleeved on the heat-conducting component along the consumable conveying direction, and the position of the first heat source part corresponds to the position of the first flow channel, and the position of the second heat source part corresponds to the position of the second flow channel.

[0013] In one embodiment, the first heat source is used to provide a first preset temperature, and the second heat source is used to provide a second preset temperature, wherein the second preset temperature is less than or equal to the first preset temperature.

[0014] In one embodiment, the melting device further includes two temperature sensing elements, both of which are mounted on the heat-conducting element, with one of the temperature sensing elements abutting against the area of ​​the heat-conducting element corresponding to the first flow channel, and the other temperature sensing element abutting against the area of ​​the heat-conducting element corresponding to the second flow channel.

[0015] In one embodiment, the melting device further includes two heat insulation plates, the heat-conducting element has a mounting groove on the side facing the heat source element, the temperature sensing element is accommodated in the mounting groove, the heat insulation plate is snapped into the mounting groove, and is disposed between the heat source element and the heat-conducting element.

[0016] In one embodiment, the heat-conducting component includes a first heat-conducting section and a second heat-conducting section connected to each other. The first flow channel is disposed in the first heat-conducting section, and the second flow channel is disposed in the second heat-conducting section. The melting device further includes a connecting column. One end of the connecting column is inserted into the first heat-conducting section, and the other end of the connecting column is inserted into the second heat-conducting section. The connecting column is provided with a third flow channel that communicates with the first flow channel and the second flow channel respectively.

[0017] Beneficial effects:

[0018] The melting device provided in this application includes a heat-conducting component and a heat source component. The heat-conducting component includes a first flow channel and a second flow channel arranged sequentially along the consumable conveying direction. The second flow channel is connected to the first flow channel, and the cross-sectional area of ​​the inlet of the second flow channel is larger than the cross-sectional area of ​​the outlet of the first flow channel. The heat source component is sleeved on the heat-conducting component to heat the heat-conducting component. In this application, the heat source component is sleeved on the heat-conducting component to heat the heat-conducting component, so that the consumable entering the second flow channel through the first flow channel becomes highly elastic. Since the cross-sectional area of ​​the inlet of the second flow channel is larger than the cross-sectional area of ​​the outlet of the first flow channel, the flow resistance of the highly elastic consumable can be reduced, thereby increasing the flow rate of the consumable to meet the melting requirements of the consumable during high-speed printing. Attached Figure Description

[0019] Figure 1This is a schematic diagram of a melting apparatus provided in an embodiment of this application.

[0020] Figure 2 A partial exploded view of a melting apparatus provided in an embodiment of this application.

[0021] Figure 3 This is a partial schematic diagram of a melting apparatus provided in an embodiment of this application.

[0022] Figure 4 for Figure 3 The sectional view in the image.

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0024] Figure 6 A top view of the heat-conducting element in a melting apparatus provided in one embodiment of the application.

[0025] Figure 7 A top view of the second flow channel in the heat-conducting element of a melting apparatus provided in an embodiment of the application.

[0026] Figure 8 This is a partial schematic diagram of a melting apparatus provided in another embodiment of this application.

[0027] Figure 9 for Figure 8 The sectional view in the image.

[0028] Icon labels:

[0029] 100 - Heat-conducting component; 110 - First flow channel; 111 - First bypass channel; 112 - First main channel; 120 - Second flow channel; 121 - Second bypass channel; 122 - Second main channel; 130 - Restricting part; 131 - Step; 132 - Protrusion; 140 - Support platform; 150 - Mounting groove; 160 - Limiting groove; 170 - First heat-conducting section; 180 - Second heat-conducting section; 200 - Heat source component; 210 - First heat source part; 220 - ... Second heat source section; 310-Temperature sensing element; 320-Heat insulation sheet; 330-Second connector; 340-First connector; 350-Insulation sleeve; 351-Fixing groove; 360-Blocking ring; 370-Fixing element; 380-Wire; 390-Connecting post; 391-Third flow channel; 400-Heat dissipation assembly; 410-Radiator; 420-Fan; 430-Isolation post; 440-Support post; 500-Nozzle; 510-Connector; 600-Throat. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0036] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 , Figure 1 This is a schematic diagram of a melting apparatus provided in an embodiment of this application. Figure 2 A partial exploded view of a melting apparatus provided in an embodiment of this application. Figure 3 This is a partial schematic diagram of a melting apparatus provided in an embodiment of this application. Figure 4 for Figure 3 The sectional view in the image. Figure 6 This is a top view of a heat-conducting component in a melting apparatus according to an embodiment of the present application. The melting apparatus provided in one embodiment of the present application includes a heat-conducting component 100 and a heat source component 200. The heat-conducting component 100 includes a first flow channel 110 and a second flow channel 120 arranged sequentially along the consumable conveying direction. The second flow channel 120 communicates with the first flow channel 110, and the cross-sectional area of ​​the inlet of the second flow channel 120 is larger than the cross-sectional area of ​​the outlet of the first flow channel 110. The heat source component 200 is sleeved on the heat-conducting component 100 to heat the heat-conducting component 100.

[0037] Specifically, in this application, the heat source 200 is mounted on the heat conductor 100 to heat the heat conductor 100, so that the consumable entering the second flow channel 120 through the first flow channel 110 becomes highly elastic. Since the cross-sectional area of ​​the inlet of the second flow channel 120 is larger than the cross-sectional area of ​​the outlet of the first flow channel 110, the flow resistance of the highly elastic consumable can be reduced, thereby increasing the flow rate of the consumable to meet the demand for melting of consumable during high-speed printing.

[0038] It should be noted that the consumable delivery direction refers to the flow direction of the consumable within the heat-conducting component 100. For example, see the appendix to the instruction manual. Figure 1 For example, the consumables are transported from top to bottom.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 In one embodiment, the first flow channel 110 includes at least two first bypass channels 111 and a first main channel 112. Each first bypass channel 111 is circumferentially spaced around the first main channel 112 and communicates with the first main channel 112. The inner wall of the first main channel 112 is provided with a limiting portion 130 in the area between two adjacent first bypass channels 111.

[0040] Specifically, when the consumable enters the first flow channel 110 through the first main channel 112, the protruding limiting part 130 on the inner wall of the first main channel 112 can peel off the outer surface of the consumable, so that the outer surface of the preheated consumable is squeezed into the first bypass channel 111. The consumable with a harder core passes through the first main channel 112 to heat the core of the consumable separately, thereby reducing the influence of the material on the outer surface of the consumable on the core heating, shortening the distance from the heat source 200 to the core of the consumable, thereby accelerating heat transfer and improving the overall melting speed of the consumable. Preferably, the heat-conducting element 100 is a high thermal conductivity material, so that external heat is transferred to the inside.

[0041] See Figure 4 , Figure 5 and Figure 6 , Figure 5 for Figure 4 Enlarged view at point A. In one embodiment, the diameter of the inscribed circle enclosed by each limiting portion 130 corresponding to the outlet of the first main channel 112 is smaller than the diameter of the inscribed circle enclosed by each limiting portion 130 corresponding to the inlet of the first main channel 112. As a result, the diameter of the inscribed circle enclosed by the limiting portion 130 is reduced in the consumable conveying direction, thereby enabling the limiting portion 130 to gradually peel off the outer surface of the consumable and gradually penetrate into the core of the consumable. This reduces the resistance to the consumable in the first flow channel 110 and increases the flow rate of the consumable in the first flow channel 110.

[0042] See Figure 4 , Figure 5 and Figure 6 In one embodiment, in the consumable delivery direction, the constriction portion 130 includes at least one step 131, and in the direction from the first flow channel 110 to the second flow channel 120, the diameter of the inscribed circle enclosed by the constriction portion 130 gradually decreases.

[0043] Specifically, the compression section 130 includes at least one step 131, such that the diameter of the inscribed circle enclosed by the compression section 130 gradually decreases in the consumable conveying direction, so that during the flow of the consumable in the first main channel 112, the step 131 can abut against the consumable in the axial direction, thereby accurately peeling off the outer surface of the consumable, avoiding compression of the consumable, and improving the reliability of the melting device.

[0044] Furthermore, the number of steps 131 is at least two. In the consumable conveying direction, each step 131 is protruded in sequence, thereby peeling off the outer surface of the consumable step by step, reducing the resistance of the consumable in the first flow channel 110, and increasing the flow rate of the consumable in the first flow channel 110.

[0045] It should be noted that the diameter of the first main channel 112 is larger than the diameter of the consumable, and the step 131 on the side away from the second flow channel 120 is a certain distance from the end of the first flow channel 110 away from the second flow channel 120, so that the consumable can enter the first flow channel 110 through the first main channel 112, and under the heating action of the heat-conducting component 100, the outer surface of the consumable melts to a certain extent, so that the outer surface of the consumable is squeezed into the first bypass channel 111 under the peeling action of the step 131.

[0046] See Figure 4 , Figure 5 and Figure 6 In one embodiment, the constriction portion 130 is connected to the inner wall of the corresponding two adjacent first bypass channels 111, so that after the step 131 peels off the outer surface of the consumable, the outer surface of the consumable can be guided into the corresponding first bypass channel 111 along the outer wall of the constriction portion 130, thereby increasing the flow rate of the consumable in the first flow channel 110.

[0047] Furthermore, at the junction of the constriction portion 130 and the inner wall of the corresponding first bypass channel 111, there is a smooth transition, which allows the outer surface of the consumable to be more smoothly squeezed into the first bypass channel 111, thereby increasing the flow velocity of the consumable in the first flow channel 110. Preferably, the inner walls of both the first main channel 112 and the first bypass channel 111 are arc-shaped.

[0048] See Figure 4 , Figure 5 and Figure 6 In one embodiment, the limiting portion 130 further includes a protrusion 132 located at one end of the limiting portion 130 away from the inner wall of the first main channel 112. In the radial direction from the inside to the outside of the first main channel 112, the size of the protrusion 132 gradually decreases in the circumferential direction of the first main channel 112, thereby facilitating the protrusion 132 to extend into the consumable core and accelerate heat transfer.

[0049] Furthermore, the end of the protrusion 132 has a pointed tip, which facilitates the protrusion 132 extending into the core of the consumable. There is a certain distance between the protrusion 132 and the step 131 located closest to the second flow channel 120, so that the protrusion 132 can also play a role in peeling off the outer surface of the consumable, further accelerating heat transfer.

[0050] See Figure 4 , Figure 6 and Figure 7 , Figure 7 This is a top view of the second flow channel in the heat-conducting component of a melting apparatus provided in one embodiment of the application. In one embodiment, the inner contour perimeter of the second flow channel 120 is greater than the inner contour perimeter of the first flow channel 110, thereby increasing the contact area with the consumable, accelerating the heat transfer to the consumable, and improving the melting efficiency of the consumable.

[0051] See Figure 4 , Figure 6 and Figure 7 In one embodiment, the second flow channel 120 includes at least three second bypass channels 121 and a second main channel 122, with each second bypass channel 121 circumferentially spaced around the second main channel 122 and communicating with the second main channel 122.

[0052] Specifically, the cross-sectional area of ​​the second flow channel 120 is a closed shape surrounded by multiple arc-shaped edges, that is, the cross-section of the second flow channel 120 is "multi-ringed," which has a richer surface area and inner contour perimeter, thereby greatly increasing the contact area between the consumable and the flow channel, improving melting efficiency, and reducing the flow resistance of the consumable and increasing the flow rate of the consumable. Preferably, in this embodiment, the number of first bypass channels 111 is four, and the number of second bypass channels 121 is five.

[0053] Furthermore, the axis of the second main channel 122 is coaxial with that of the first main channel 112, thereby facilitating the flow of consumables in the first flow channel 110 into the second flow channel 120 and reducing resistance to the flow of highly elastic consumables.

[0054] In other embodiments, the cross-section of the second flow channel 120 can also be other irregular shapes, as long as the cross-sectional area of ​​the second flow channel 120 is greater than the cross-sectional area of ​​the first flow channel 110, and the inner contour perimeter of the second flow channel 120 is greater than the inner contour perimeter of the first flow channel 110.

[0055] See Figure 2 , Figure 4 and Figure 5In one embodiment, the heat source component 200 includes a first heat source part 210 and a second heat source part 220. The first heat source part 210 and the second heat source part 220 are sequentially sleeved on the heat-conducting component 100 along the consumable conveying direction. The position of the first heat source part 210 corresponds to the position of the first flow channel 110, and the position of the second heat source part 220 corresponds to the position of the second flow channel 120.

[0056] Specifically, the position of the first heat source 210 corresponds to the position of the first flow channel 110, and the position of the second heat source 220 corresponds to the position of the second flow channel 120. This allows the first heat source 210 and the second heat source 220 to be controlled separately to provide different or the same heat to the consumables in the first flow channel 110 and the consumables in the second flow channel 120. This can effectively and quickly melt cold consumables without causing the outlet consumables temperature to be too high, which would make it difficult to form, thus improving the reliability of the melting device.

[0057] See Figure 2 , Figure 4 and Figure 5 In one embodiment, the first heat source 210 is used to provide a first preset temperature, and the second heat source 220 is used to provide a second preset temperature, wherein the second preset temperature is less than or equal to the first preset temperature.

[0058] Specifically, the first preset temperature T1 provided by the first heat source 210 is greater than or equal to the suitable heating temperature of the consumable; the second preset temperature T2 provided by the second heat source 220 is equal to the suitable heating temperature of the consumable. When the temperature of the consumable exceeds the maximum suitable printing temperature, its flow state changes, making it difficult to form during printing and severely affecting print quality. Therefore, existing technologies control the heating temperature within the suitable printing temperature of the consumable. This solution uses a suitable printing temperature of 200-220℃ as an example. In this solution, T1 is set to a maximum of 240℃, which is higher than the suitable printing temperature of the consumable. However, this only applies to the temperature corresponding to the heat-conducting component 100 and the first flow channel 110, i.e., the upper half of the heating flow channel. During rapid printing, the consumable is continuously pushed in. After entering the heating flow channel, the consumable quickly passes through the upper half and reaches the lower half. The heat treatment time is limited, and the amount of heat absorbed is limited. Therefore, it only accelerates the heat absorption and melting of the consumable, and cannot raise the temperature of the consumable to the set temperature. The consumable continues to absorb heat and melt as it passes through the lower half until it approaches the set temperature T2 of the lower half. When the printing speed slows down, the filament stays in the upper half for a longer time, melting more thoroughly. The temperature of the filament may even exceed the temperature of T2. When the filament reaches the lower half of the flow channel, it will dissipate heat and cool down, so that the temperature of the filament when it flows out is close to T2, so as to print better.

[0059] The values ​​of T1 and T2 can be set to be the same or different as needed, or they can change in real time according to the printing process.

[0060] See Figure 2 , Figure 4 and Figure 5 In one embodiment, the melting device further includes two temperature sensing elements 310, both of which are mounted on the heat-conducting element 100. One of the temperature sensing elements 310 abuts against the area of ​​the heat-conducting element 100 corresponding to the first flow channel 110, and the other temperature sensing element 310 abuts against the area of ​​the heat-conducting element 100 corresponding to the second flow channel 120.

[0061] Specifically, the temperature of the upper and lower halves of the heat-conducting component 100 is detected by two temperature sensing elements 310 to obtain the temperature of the consumables in the first flow channel 110 and the second flow channel 120, thereby facilitating the control of the opening or closing of the first heat source 210 and the second heat source 220, so that the temperature of the consumables flowing out is close to T2, so as to print better.

[0062] Furthermore, the melting device also includes a controller, which is electrically connected to the first heat source 210, the second heat source 220, and the two temperature sensing elements 310. After printing preparation and printing commencement, the two temperature sensing elements 310 send the front-end temperature A1 and rear-end temperature A2 of the heat-conducting element 100 to the controller in real time. The controller compares the received A1 data with T1 in real time, and the A2 data with T2 in real time. When the detected temperature approaches the set temperature, the controller gradually reduces the heating power of the heat source element 200 until the detected temperature is greater than or equal to the set temperature, at which point heating stops, ensuring that the temperature of A1 is maintained at T1 and the temperature of A2 is maintained at T2 until printing is complete.

[0063] See Figure 2 , Figure 4 and Figure 5 In one embodiment, the melting device further includes two heat insulation plates 320. The heat-conducting element 100 has a mounting groove 150 on the side facing the heat source element 200. The temperature-sensing element 310 is accommodated in the mounting groove 150, and the heat insulation plate 320 is snapped into the mounting groove 150 and positioned between the heat source element 200 and the heat-conducting element 100, thereby preventing direct contact between the heat source element 200 and the temperature-sensing element 310, which could lead to inaccurate temperature measurement. There are two mounting grooves 150, with the temperature-sensing element 310 and the heat insulation plate 320 respectively disposed within their respective mounting grooves 150.

[0064] Furthermore, the heat-conducting component 100 is provided with two limiting grooves 160, which are located at both ends of the heat source component 200. The melting device also includes two retaining rings 360, which are fitted into the limiting grooves 160 and abut against the first heat source component 200 or the second heat source component 200 to fix the heat source component 200. The heat-conducting component 100 is provided with a support platform 140, and the first heat source part 210 and the second heat source part 220 are respectively located on both sides of the support platform 140 to avoid mutual interference between the first heat source part 210 and the second heat source part 220.

[0065] Furthermore, the melting device also includes an insulation sleeve 350, which is fitted onto the heat source component 200 to insulate the heat-conducting component 100. The heat-conducting component 100 is also provided with a fixing member 370, which is used to fix the wire 380 that is electrically connected to the heat source component 200 and the temperature sensing component 310.

[0066] See Figure 8 and Figure 9 , Figure 8 This is a partial schematic diagram of a melting apparatus provided in another embodiment of this application. Figure 9 for Figure 8 A cross-sectional view is shown in the figure. In one embodiment, the heat-conducting element 100 includes a first heat-conducting section 170 and a second heat-conducting section 180 connected to each other. A first flow channel 110 is disposed in the first heat-conducting section 170, and a second flow channel 120 is disposed in the second heat-conducting section 180. The melting device also includes a connecting post 390, one end of which is inserted into the first heat-conducting section 170, and the other end of which is inserted into the second heat-conducting section 180. The connecting post 390 is provided with a third flow channel 391 that communicates with the first flow channel 110 and the second flow channel 120 respectively.

[0067] Specifically, the first heat-conducting section 170 and the second heat-conducting section 180 are each provided with a groove on their opposite sides, and the connecting post 390 is inserted into the groove, thereby connecting the first heat-conducting section 170 and the second heat-conducting section 180. That is, the heat-conducting component 100 adopts a separate arrangement of the first heat-conducting section 170 and the second heat-conducting section 180 to facilitate the processing of the first flow channel 110 and the second flow channel 120.

[0068] See Figure 1 , Figure 2 , Figure 4 and Figure 5This application embodiment also provides a 3D printing nozzle, including the above-mentioned melting device, and further including a throat 600 and a nozzle 500. The throat 600 is connected to the end of the first flow channel 110 away from the second flow channel 120, and the nozzle 500 is connected to the end of the second flow channel 120 away from the first flow channel 110. In this application, when the consumable enters the first flow channel 110 via the first main channel 112, the protruding limiting part 130 on the inner wall of the first main channel 112 can peel off the outer surface of the consumable, so that the outer surface of the preheated consumable is squeezed into the first bypass channel 111. The consumable with a harder core passes through the first main channel 112 to heat the core of the consumable separately, thereby reducing the influence of the material on the outer surface of the consumable on the core heating, shortening the distance from the heat source 200 to the core of the consumable, thereby accelerating heat transfer, increasing the overall melting speed of the consumable, and reducing the flow resistance of the high-elasticity consumable by the cross-sectional area of ​​the second flow channel 120 being larger than that of the first flow channel 110, increasing the flow rate of the consumable to meet the melting requirements of the consumable during high-speed printing.

[0069] Furthermore, the 3D printing nozzle also includes a first connector 340, one end of which is inserted into the throat 600, and the other end is sleeved on the throat 600, serving as a transition connection. The throat 600 is adapted to the diameter of the filament, uses a low thermal conductivity material, and its temperature is controlled below the filament softening temperature. Under external force, the rigid filament enters the first flow channel 110 of the heat-conducting component 100 through the throat 600.

[0070] Furthermore, the 3D printing nozzle also includes a connector 510, through which the nozzle 500 is connected to the heat-conducting element 100, wherein the connector 510 is made of a highly thermally conductive material. The nozzle 500 extrudes the filament to the required diameter and is made of a wear-resistant material.

[0071] See Figure 1 and Figure 2 In one embodiment, the 3D printing nozzle further includes a heat dissipation assembly 400, which includes a heat sink 410 and a fan 420. The heat sink 410 is connected to a throat 600, and the fan 420 is connected to the heat sink 410 to dissipate heat from the heat sink 410. The 3D printing nozzle also includes a second connector 330, which is sleeved on the throat 600, and the throat 600 is connected to the heat sink 410 via the second connector 330.

[0072] Furthermore, the heat dissipation assembly 400 also includes an isolation pillar 430, which is disposed between the heat sink 410 and the fan 420 to improve heat dissipation efficiency.

[0073] Furthermore, the insulation sleeve 350 is provided with a fixing groove 351, and the heat dissipation assembly 400 also includes a support column 440. The support column 440 is accommodated in the fixing groove 351 and abuts against the radiator 410 to improve the fixing strength of the heat-conducting component 100 and prevent the throat 600 from breaking due to excessive force during movement. Preferably, there are two support columns 440, which are arranged on both sides of the insulation sleeve 350.

[0074] See Figure 1 , Figure 2 , Figure 4 and Figure 5 This application also provides a 3D printer, including the aforementioned 3D printing nozzle. In this application, when the consumable enters the first flow channel 110 via the first main channel 112, the protruding limiting portion 130 on the inner wall of the first main channel 112 can peel off the outer surface of the consumable, causing the preheated outer surface of the consumable to be squeezed into the first bypass channel 111. The harder consumable core passes through the first main channel 112, allowing for separate heating of the consumable core, thereby reducing the influence of the material on the outer surface of the consumable on the core heating, shortening the distance from the heat source 200 to the consumable core, accelerating heat transfer, increasing the overall melting speed of the consumable, and reducing the flow resistance of the highly elastic consumable by the larger cross-sectional area of ​​the second flow channel 120 compared to the first flow channel 110, increasing the consumable flow rate to meet the melting requirements of the consumable during high-speed printing.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0076] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A melting apparatus, characterized in that, The melting apparatus includes: A heat-conducting component (100) includes a first flow channel (110) and a second flow channel (120) arranged sequentially along the consumable conveying direction. The second flow channel (120) is connected to the first flow channel (110), and the cross-sectional area of ​​the inlet of the second flow channel (120) is larger than the cross-sectional area of ​​the outlet of the first flow channel (110). A heat source (200) is fitted onto the heat-conducting component (100) to heat the heat-conducting component (100).

2. The melting apparatus according to claim 1, characterized in that, The first flow channel (110) includes at least two first bypass channels (111) and a first main channel (112). Each first bypass channel (111) is circumferentially spaced around the first main channel (112) and communicates with the first main channel (112). The inner wall of the first main channel (112) is provided with a limiting portion (130) in the area between any two adjacent first bypass channels (111).

3. The melting apparatus according to claim 2, characterized in that, The diameter of the inscribed circle enclosed by each of the limiting portions (130) corresponding to the discharge port of the first main channel (112) is smaller than the diameter of the inscribed circle enclosed by each of the limiting portions (130) corresponding to the inlet port of the first main channel (112).

4. The melting apparatus according to claim 3, characterized in that, In the consumable transport direction, the limiting portion (130) includes at least one step (131) to gradually reduce the diameter of the inscribed circle enclosed by the limiting portion (130).

5. The melting apparatus according to any one of claims 1-4, characterized in that, The inner contour perimeter of the second flow channel (120) is greater than the inner contour perimeter of the first flow channel (110).

6. The melting apparatus according to any one of claims 1-4, characterized in that, The heat source component (200) includes a first heat source part (210) and a second heat source part (220). The first heat source part (210) and the second heat source part (220) are sequentially sleeved on the heat-conducting component (100) along the consumable conveying direction. The position of the first heat source part (210) corresponds to the position of the first flow channel (110), and the position of the second heat source part (220) corresponds to the position of the second flow channel (120).

7. The melting apparatus according to claim 6, characterized in that, The first heat source (210) is used to provide a first preset temperature, and the second heat source (220) is used to provide a second preset temperature, wherein the second preset temperature is less than or equal to the first preset temperature.

8. The melting apparatus according to claim 6, characterized in that, The melting device further includes two temperature sensing elements (310), both of which are mounted on the heat-conducting element (100). One of the temperature sensing elements (310) abuts against the area of ​​the heat-conducting element (100) corresponding to the first flow channel (110), and the other temperature sensing element (310) abuts against the area of ​​the heat-conducting element (100) corresponding to the second flow channel (120).

9. The melting apparatus according to claim 8, characterized in that, The melting device also includes two heat insulation plates (320). The heat-conducting element (100) is provided with a mounting groove (150) on the side facing the heat source element (200). The temperature sensing element (310) is accommodated in the mounting groove (150). The heat insulation plate (320) is snapped into the mounting groove (150) and is located between the heat source element (200) and the heat-conducting element (100).

10. The melting apparatus according to any one of claims 1-4, characterized in that, The heat-conducting component (100) includes a first heat-conducting section (170) and a second heat-conducting section (180) connected to each other. The first flow channel (110) is disposed in the first heat-conducting section (170), and the second flow channel (120) is disposed in the second heat-conducting section (180). The melting device also includes a connecting column (390). One end of the connecting column (390) is inserted into the first heat-conducting section (170), and the other end of the connecting column (390) is inserted into the second heat-conducting section (180). The connecting column (390) is provided with a third flow channel (391) that is connected to the first flow channel (110) and the second flow channel (120) respectively.

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