Hot melting nozzle and 3D printer

Abstract

According to the hot melting nozzle and the 3D printer, the hot melting speed of solid filiform consumables can be higher, and the requirement for the high extrusion rate can be met. The hot melting nozzle comprises a heat conduction piece, a first channel is arranged in the heat conduction piece, and the heat conduction piece further comprises an inlet channel and a second channel; the top end of the first channel is closed; the inlet channel is obliquely communicated with the side wall of the first channel; an inlet of the second channel is located in the side wall of the first channel and right faces a discharging port of the inlet channel. An outlet of the second channel is located in the side wall of the first channel or communicated with the conveying channel of the nozzle body. The second channel diameter is smaller than the inlet channel diameter.

Description

Technical Field

[0001] The present disclosure relates to the technical field of 3D printers, in particular to a hot melt nozzle, and also relates to a 3D printer. Background Art

[0002] The nozzle of an FDM (Fused Deposition Modeling) type 3D printer is used to melt and extrude a molten solid filamentary consumable. Specifically, the solid filamentary consumable enters the nozzle under the action of an external force, is heated and melted in the nozzle, and is extruded from the nozzle outlet, and is laminated layer by layer to print a 3D model.

[0003] When the thermal conductivity of the solid filamentary consumable is low and the extrusion rate is high, since the residence time of the solid filamentary consumable in the nozzle heat channel is short, the core of the solid filamentary consumable cannot be fully melted in the nozzle.

[0004] To solve the problem of uneven heating of the core of the solid filamentary consumable, in the related art, a heat conducting component is arranged in the nozzle heat channel. This method can solve the above problem to a certain extent. However, there are difficulties in manufacturing / fixing the heat conducting component on the inner wall of the nozzle heat channel, such as difficult processing, complex process and low efficiency, and the contact area between the heat conducting component and the solid filamentary consumable is limited, so the improvement of the heat conduction efficiency is limited. Summary of the Utility Model

[0005] Based on this, in view of the problem that the core of the solid filamentary consumable cannot be fully melted in the nozzle, it is necessary to propose a hot melt nozzle. A 3D printer is also proposed.

[0006] A hot melt nozzle includes a heat conducting member. A first channel is provided in the heat conducting member. The heat conducting member further includes an inlet channel and a second channel; the top of the first channel is closed; the inlet channel is obliquely connected to the side wall of the first channel; the inlet of the second channel is located on the side wall of the first channel and is opposite to the outlet of the inlet channel; the outlet of the second channel is located on the side wall of the first channel or is connected to the conveying channel of the nozzle body; the diameter of the second channel is smaller than the diameter of the inlet channel.

[0007] In some embodiments, a tapered section is provided at the inlet of the second channel.

[0008] In some embodiments, the second channel is an arc-shaped channel.

[0009] In some embodiments, the second channel is a broken line channel, and the broken line channel includes at least two straight channels that are connected in an obtuse angle in sequence.

[0010] In some embodiments, the second channel includes an obtuse-angle connection between a first straight channel and a second straight channel. The inlet of the first straight channel is connected to the outlet of the inlet channel. The inlet of the second straight channel is directly opposite and connected to the outlet of the first straight channel. The outlet of the second straight channel is connected to the first channel.

[0011] In some embodiments, the heat conducting member includes an outer body, a first inner body and a second inner body stacked inside the outer body. Each of the outer body, the first inner body and the second inner body is provided with a part of the first channel. The first inner body and the second inner body are respectively provided with the first straight channel and the second straight channel.

[0012] In some embodiments, a third straight channel is further provided between the first straight channel and the second straight channel. The inlet of the third straight channel is directly opposite and connected to the outlet of the first straight channel. The outlet of the third straight channel is directly opposite and connected to the inlet of the second straight channel. The heat conducting member includes an outer body, a first inner body, a second inner body stacked inside the outer body, and a third inner body disposed between the first inner body and the second inner body. Each of the outer body, the first inner body, the second inner body and the third inner body is provided with a part of the first channel. The first inner body, the second inner body and the third inner body are respectively provided with the first straight channel, the second straight channel and the third straight channel.

[0013] In some embodiments, the hot melt nozzle further includes a nozzle body having a conveying channel. The conveying channel is connected to the first channel. The outer body is provided with a groove. The nozzle body is threadedly connected to the groove to fix each inner body inside the outer body.

[0014] In some embodiments, a positioning mechanism is provided between at least two adjacent inner bodies and / or between the inner body and the outer body.

[0015] A 3D printer includes the hot melt nozzle and a throat as described above. The throat is connected to the inlet channel.

[0016] In the present disclosure, the hot melt nozzle can heat the outer ring of the solid filamentary consumable by using the inlet channel, and then separate the outer ring of the solid filamentary consumable from the core by using the second channel. The outer ring is further heated in the first channel and pushed to the nozzle body. The core is continuously heated in the second channel and pushed to the first channel. By separating the outer ring, the heat conduction distance between the core and the heat conducting member is reduced, so that the heat conducting member can heat the core faster, thereby making the hot melt speed of the solid filamentary consumable faster and meeting the requirements of a higher extrusion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view structural diagram of a hot melt nozzle according to an embodiment of the present disclosure.

[0018] Figure 2 Side view structure diagram of a hot melt nozzle according to an embodiment of the present disclosure.

[0019] Figure 3 is Figure 2 Cross-sectional view along the A-A direction of

[0020] Figure 4 is Figure 3 Cross-sectional view along the B-B direction of

[0021] Figure 5 Cross-sectional view of a hot melt nozzle according to another embodiment of the present disclosure.

[0022] Figure 6 Cross-sectional view of the outer body of a hot melt nozzle according to another embodiment of the present disclosure.

[0023] Figure 7 Cross-sectional view of the first inner body of a hot melt nozzle according to another embodiment of the present disclosure.

[0024] Figure 8 Cross-sectional view of the second inner body of a hot melt nozzle according to another embodiment of the present disclosure.

[0025] Figure 9 Schematic diagram of another fitting structure of the first inner body and the second inner body with the outer body.

[0026] Figure 10 Cross-sectional view of a hot melt nozzle according to still another embodiment of the present disclosure.

[0027] Figure 11 Cross-sectional view of the first inner body of a hot melt nozzle according to still another embodiment of the present disclosure.

[0028] Figure 12 Cross-sectional view of the second inner body of a hot melt nozzle according to still another embodiment of the present disclosure.

[0029] Figure 13 Cross-sectional view of the third inner body of a hot melt nozzle according to still another embodiment of the present disclosure.

[0030] Reference numerals:

[0031] 100, Hot melt nozzle; 10, Nozzle body; 110, Delivery channel; 20, Heat conducting member; 201, Protrusion; 202, Hole; 210, Inlet channel; 211, Feed port; 212, Discharge port; 220, First channel; 221, Basic section; 222, First sub-section; 223, Second sub-section; 224, Third sub-section; 230, Second channel; 231, Inlet; 2311, Tapered section; 232, Outlet; 233, First straight channel; 234, Second straight channel; 235, Third straight channel; 240, Outer body; 241, Groove; 250, First inner body; 260, Second inner body; 270, Third inner body; 30, Connection assembly; 310, First connector; 320, Throat tube; 330, Second connector. Detailed implementation manners

[0032] To make the above objects, features, and advantages of the present disclosure more apparent and understandable, the following provides a detailed description of the specific implementation manners of the present disclosure with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present disclosure. Therefore, the present disclosure is not limited by the specific embodiments disclosed below.

[0033] In the description of the present disclosure, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial X", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present disclosure.

[0034] In addition, if there are terms such as "first" and "second", these terms 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, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, if there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] An embodiment of the first aspect of the present disclosure provides a hot melt nozzle, which is used to receive a solid filamentary consumable, melt it, and extrude it from the nozzle outlet. The hot melt nozzle of the present disclosure can be applied to any industry that requires a hot melt nozzle, such as 3D printing, the spinning industry, thermal spraying, etc.

[0036] As Figures 1 to 4 shown, the hot melt nozzle 100 includes a nozzle body 10 and a heat conducting member 20. A conveying channel 110 is provided along the axial direction X of the nozzle body 10. The conveying channel 110 is used to allow the melted solid filamentary consumable to flow out of the nozzle body 10 under the action of an external force.

[0037] The heat conducting member 20 is connected to the nozzle body 10. An inlet channel 210, a first channel 220, and a second channel 230 are provided in the heat conducting member 20. The top end of the first channel 220 is closed. The inlet channel 210 is inclined and communicates with the side wall of the first channel 220. The inlet 231 of the second channel 230 is located on the side wall of the first channel 220 and is directly opposite to the discharge port 212 of the inlet channel 210. The outlets 232 of the second channel 230 are all located on the side wall of the first channel 220. And the diameter of the second channel 230 is smaller than the diameter of the inlet channel 210.

[0038] In this embodiment, both the inlet 231 and the outlet 232 of the second channel 230 are located on the side wall of the first channel 220. In an alternative embodiment, the inlet 231 of the second channel 230 is located on the side wall of the first channel 220, while the outlet 232 of the second channel 230 communicates with the conveying channel of the nozzle body 10.

[0039] When the hot melt nozzle 100 is in use, the axial direction X of the nozzle body 10 is usually along the vertical direction, and the nozzle body 10 is located below the heat conducting member 20. The axial direction X of the nozzle body 10 can also have a certain angle with the vertical direction. The conveying channel 110 in the nozzle body 10 extends along the axial direction X of the nozzle body 10 and penetrates through the upper end and the lower end of the nozzle body 10. That is to say, the conveying channel 110 has an opening at the upper end of the nozzle body 10 and an opening at the lower end of the nozzle body 10. The melted solid filamentary consumable in the heat conducting member 20 enters the conveying channel 110 from the upper end of the nozzle body 10 and leaves the conveying channel 110 from the lower end of the nozzle body 10.

[0040] As Figure 4 shown, the cross section of the conveying channel 110 is circular. In other embodiments, the cross section of the conveying channel 110 is a circular segment shape, that is, a plurality of notches are further opened on the circumference, so as to increase the heat conducting area of the inner side wall of the conveying channel 110, and then increase the melting rate of the solid filamentary consumable.

[0041] The heat conducting member 20 has heat conducting ability to heat and melt the solid filamentary consumable inside. Optionally, the material of the heat conducting member 20 is a material with high heat conductivity such as copper or aluminum.

[0042] The size of the inlet channel 210 is set to be able to adapt to the diameter of the solid filamentary consumable, while the diameter of the second channel 230 is smaller than the diameter of the solid filamentary consumable. Optionally, the inlet channel 210 is set to be able to convey a solid filamentary consumable with a diameter of 1.75 mm or 3 mm, the diameter of the inlet channel 210 is equal to 1.75 mm or 3 mm, and the diameter of the second channel 230 is smaller than 1.75 mm or 3 mm.

[0043] As Figure 1 、 Figure 3 As shown, the hot melt nozzle 100 further includes a connection assembly 30. One end of the connection assembly 30 is connected to the feed port 211 of the inlet channel 210, and the other end faces an extrusion wheel (not shown in the figure) for conveying the consumable. The connection assembly 30 is used to provide guidance for the incoming consumable and isolate the heat conduction of the high-temperature heat conducting member 20.

[0044] Furthermore, the connection assembly 30 includes a first connector 310, a throat 320, and a second connector 330. Both the first connector 310 and the second connector 330 are hollow tubular structures, and the throat 320 connects the first connector 310 and the second connector 330 in the middle. The first connector 310 is threadedly connected to the feed port 211 of the inlet channel 210, and the second connector 330 is used to dock with the output end of the solid filamentary consumable conveying device.

[0045] As Figure 3 As shown, after the heat conducting member 20 is assembled with the nozzle body 10, the first channel 220 is located above the conveying channel 110 and the two are in communication in the axial direction X of the nozzle body 10. The first channel 220 is used to convey the melted solid filamentary consumable into the conveying channel 110. Among them, the solid filamentary consumable is pushed forward under the action of a continuous external force.

[0046] The inlet 231 of the second channel 230 is coaxially arranged with the outlet 212 of the inlet channel 210. After the solid filamentary consumable extends out of the outlet 212 of the inlet channel 210, it can continue to move towards the inlet 231 of the second channel 230. The diameter of the second channel 230 is smaller than the diameter of the inlet channel 210. In this way, the second channel 230 will be able to block the outer circle of the solid filamentary consumable, so that the outer circle of the consumable is separated when it enters the second channel 230. The outlet 232 of the second channel 230 is in communication with the first channel 220 and is offset towards the side closer to the conveying channel 110 relative to the inlet 231 of the second channel 230, that is, the outlet 232 of the second channel 230 is closer to the conveying channel 110 in the axial direction X of the nozzle body 10. Specifically, Figure 3In it, the outlet 232 of the second channel 230 is located below the inlet 231 of the second channel 230. Specifically, the cross-section of the second channel 230 is circular, but it is not limited thereto.

[0047] The size of the heat conducting member 20 should be set to facilitate the construction of the inlet channel 210, the first channel 220, and the second channel 230. Optionally, the main body of the heat conducting member 20 is a cylinder. Generally, the diameter is at least twice that of the first channel 220 to facilitate the opening of the second channel 230 through the wall. Moreover, the thick wall of the heat conducting member 20 also helps to increase the heat conduction capacity of the heat conducting member 20 and can accelerate the melting speed of the solid filamentary consumable.

[0048] When the hot melt nozzle 100 is in use, the solid filamentary consumable is pushed from the inlet channel 210 into the heat conducting member 20. During the process of being pushed in the inlet channel 210, the inlet channel 210 heats the solid filamentary consumable, causing the solid filamentary consumable to soften from the outside to the inside. Because the heat conduction coefficient of the consumable is low, when it first enters the heat conducting member, it absorbs little heat and only the outer ring of the consumable can be softened, while the inner core remains in a hard state. When the solid filamentary consumable is pushed to the inlet 231 of the second channel 230, the second channel 230 blocks the passage of the outer ring of the solid filamentary consumable. The second channel 230 separates the outer ring of the already softened solid filamentary consumable, so that only the remaining hard core of the solid filamentary consumable enters the second channel 230. The separated outer ring of the solid filamentary consumable continues to be heated in the first channel 220 and is pushed to the conveying channel 110. The core of the solid filamentary consumable is continuously heated in the second channel 230 and is pushed forward along the second channel 230, and finally merges into the first channel 220 through the outlet 232 of the second channel 230.

[0049] According to the thermodynamic formula of heat conduction, the heat Q received by the solid filamentary consumable is Q = kΔT / R = ΔT * λ * S / L, where R = L / (λ * S); Q: heat (w), ΔT: temperature difference (k); R: thermal resistance (k / w), L: thickness of the consumable (m); λ: heat conduction coefficient [w / (mK]; S: area (m2). It can be seen from the above formula that the larger the heat receiving area S of the solid filamentary consumable and the shorter the central heat conduction distance, the faster the heating and the faster the melting speed.

[0050] The hot-melt nozzle 100 of the present disclosure can preheat the outer ring of the solid filamentary consumable by means of the inlet channel 210, and then separate the outer ring of the solid filamentary consumable by means of the second channel 230. The outer ring is heated in the first channel 220 and pushed to the nozzle body 10, and the core is continuously heated in the second channel 230 and pushed to the first channel 220. By separating the outer ring, the heat conduction distance when heat is transferred to the core is reduced, enabling the heat conducting member 20 to heat the core faster, so that the hot-melt speed of the solid filamentary consumable is faster, the time required for the consumable to absorb heat in the heat conducting member and be converted into a molten state can be reduced, and thus rapid discharging is facilitated. In addition, the hot-melt nozzle 100 of the present disclosure realizes rapid heating and melting of the core by adding a second channel 230 inside the heat conducting member. Compared with the related art, there is no need to additionally provide a heat conducting component inside the nozzle body 10, and the structure is simple.

[0051] In some embodiments, the inlet channel 210 communicates with the first channel 220 at an obtuse angle, and the feed port 211 of the inlet channel 210 is offset from the discharge port 212 of the inlet channel 210 to the side away from the conveying channel 110. The inlet channel 210 communicating with the first channel 220 at an obtuse angle means that the axial direction Y of the inlet channel 210 and the axial direction X of the first channel 220 are set at an obtuse angle, and the inlet channel 210 is inclined with respect to the first channel 220.

[0052] In the above manner, the feed port 211 of the inlet channel 210 is located obliquely above the discharge port 212 of the inlet channel 210. The solid filamentary consumable is pushed in the inlet channel 210 in an inclined downward direction, so that the pushing resistance of the solid filamentary consumable is small and the pushing speed is fast.

[0053] In some embodiments, referring to Figure 3 , a tapered section 2311 is further provided at the inlet 231 of the second channel 230, and the tapered section 2311 is used to guide the solid filamentary consumable into the second channel 230. Specifically, the inner diameter of the tapered section 2311 gradually contracts, which can guide the core of the solid filamentary consumable to advance into the inlet 231 of the second channel 230. The opening diameter of the tapered section 2311 is larger than the discharge port 212 of the inlet channel 210. In this way, even if the consumable is deflected after the discharge port 212 of the inlet and outlet channel 210, it can smoothly enter the second channel 230.

[0054] In some embodiments, referring to Figure 3 , the second channel 230 is an arc-shaped channel. With this arc-shaped setting method, the entire second channel 230 has no blunt corners, avoiding the solid filamentary consumable from being blocked during advancement, that is, the pushing resistance of the solid filamentary consumable is small and the pushing speed is fast. The radius of the arc is not limited and can be appropriately adjusted according to the requirements of the pushing speed. Its center can fall on the first channel 220 or on one side of the first channel 220.

[0055] The second channel 230 can also be configured not to be arcuate. For example, referring to Figure 7 and Figure 8 , the second channel 230 is a broken-line channel. The broken-line channel includes at least two linearly connected channels in sequence (the first linear channel 233 and the second linear channel 234 respectively). Among adjacent linear channels, the outlet of the upstream linear channel and the inlet of the downstream linear channel are directly opposite and connected.

[0056] In the present disclosure, being directly opposite and connected means that the adjacent outlet and inlet are coaxial and connected. When the solid filamentary consumable is advanced, it successively passes through the upstream linear channel and the downstream linear channel. The outlets and inlets of adjacent linear channels are directly opposite and connected, so that the solid filamentary consumable flowing out of the outlet of the upstream linear channel can flow into the inlet of the downstream linear channel without changing direction. In this way, the propulsion resistance of the solid filamentary consumable is small, and the blockage of the solid filamentary consumable during propulsion can be avoided.

[0057] Optionally, the second channel is a broken-line channel. Referring to Figures 5 to 8 , the second channel 230 includes a first linear channel 233 and a second linear channel 234. The inlet of the first linear channel 233 is connected to the discharge port 212 of the inlet channel 210. The inlet of the second linear channel 234 is directly opposite and connected to the outlet of the first linear channel 233, and the outlet of the second linear channel 234 is connected to the first channel 220. The inlet of the first linear channel 233 is also the inlet 231 of the entire second channel 230. The outlet of the second linear channel 234 is also the outlet 232 of the entire second channel 230.

[0058] The first linear channel 233 and the second linear channel 234 are specifically set to be connected at an obtuse angle. On the axis X of the nozzle body 10, the outlet of the first linear channel 233 is located above the inlet of the second linear channel 234. After being extruded from the outlet of the first linear channel 233, it enters the inlet of the second linear channel 234 with an obtuse-angle change in direction. The propulsion resistance of the solid filamentary consumable is relatively small when transitioning from the first linear channel 233 to the second linear channel 234.

[0059] Other parts of the hot-melt nozzle 100 can adopt a similar overall structure to that of the hot-melt nozzle 100 shown in Figures 1 to 4 .

[0060] Furthermore, optionally, referring to Figures 5 to 8, for the convenience of setting the second channel 230. The heat conducting member 20 includes an outer body 240, a first inner body 250 and a second inner body 260 which are stacked and inserted into the outer body 240. A part of the first channel 220 is provided in each of the outer body 240, the first inner body 250 and the second inner body 260. A part of the second channel 230 is also provided in each of the first inner body 250 and the second inner body 260. The first inner body 250 and the second inner body 260 are stacked and located between the outer body 240 and the nozzle body 10, and the nozzle body 10 abuts against the second inner body 260 along the axial direction X of the nozzle body 10, so that the first inner body 250 is pressed against the outer body 240.

[0061] Wherein, a basic section 221 of the first channel 220 is provided in the outer body 240. The first inner body 250 and the second inner body 260 are respectively provided with a first segment 222 and a second segment 223 of the first channel 220. After the first inner body 250 and the second inner body 260 are stacked and docked with the outer body 240, the basic section 221, the first segment 222 and the second segment 223 of the first channel 220 together form the first channel 220. The first channel 220 is formed by splicing multiple segments, which is relatively convenient for processing and preparation. Optionally, the processing can be drilling.

[0062] The first inner body 250 and the second inner body 260 are respectively provided with a first straight channel 233 and a second straight channel 234. After the first inner body 250 and the second inner body 260 are stacked, the first straight channel 233 and the second straight channel 234 form the second channel 230. The second channel 230 is formed by splicing the first straight channel 233 and the second straight channel 234, which is convenient for processing each straight segment.

[0063] In addition, by fixedly connecting the nozzle body 10 with the outer body 240, each inner body is pressed against the outer body 240, so that there is no gap between the parts of the second channel 230. Moreover, there is no need to set a fixing structure between each inner body and between the inner body and the outer body 240, thus simplifying the structural design of the heat conducting member 20.

[0064] Optionally, the outer body 240 is provided with a groove 241. The first inner body 250, the second inner body 260 and the nozzle body 10 are all inserted into the groove 241, and the nozzle body 10 is threadedly connected with the groove 241.

[0065] Such as Figure 5As shown in the figure, a groove 241 is provided at the lower end of the outer body 240. A plurality of stacked inner bodies and the nozzle body 10 are inserted into the groove 241. An external thread is provided on the outer side wall of the nozzle body 10, and an internal thread matching the above external thread is provided on the groove side wall of the groove 241. When the nozzle body 10 is threadedly connected to the groove 241, the upper end of the nozzle body 10 abuts against the second inner body 260, and then the first inner body 250 and the second inner body 260 are pressed against the groove top wall of the groove 241.

[0066] Optionally, one of the first inner body 250 and the second inner body 260 is provided with a protrusion 201, and the other is provided with a matching hole 202. With this setting, adjacent two inner bodies can be stacked conveniently and accurately, so that each straight line segment is spliced into the second channel 230. In this embodiment, a hole 202 is provided at the bottom of the first inner body 250, and a protrusion 201 is provided at the top of the second inner body 260.

[0067] Optionally, one of the first inner body 250 and the outer body 240 is provided with a protrusion 201, and the other is provided with a matching hole 202. For the outer body 240, when a groove 241 is provided at its lower end, the protrusion 201 or the hole 202 thereon is provided on the groove top wall of the groove 241. With this setting, the first inner body 250 and the outer body 240 can be quickly docked. In this embodiment, a protrusion 201 is provided at the top of the first inner body 250, and a hole 202 is provided on the groove top wall of the groove 241.

[0068] Optionally, the shape of the cross section of each inner body is adapted to the cross-sectional profile shape of the groove side wall of the groove 241, and each inner body is engaged with the groove side wall. Refer to Figure 9 , the groove 241 can be a regular polyhedron groove, such as a regular tetrahedron groove, a regular pentahedron groove, a regular hexahedron groove, etc.; the first inner body 250 and the second inner body 260 correspondingly are also regular polyhedrons; between each inner body and between the inner body and the outer body 240, no fixing structure needs to be provided, and quick alignment can be realized according to the corresponding faces.

[0069] Optionally, other alignment mechanisms can also be adopted between each adjacent inner body and / or between each inner body and the outer body 240, and are not limited to the above alignment mechanisms and alignment methods.

[0070] Such as Figures 10 to 13As shown, a hot melt nozzle 100 provided according to another embodiment of the first aspect of the present disclosure is schematically illustrated. The second channel 230 includes a first straight channel 233, a second straight channel 234, and further includes a third straight channel 235 between the first straight channel 233 and the second straight channel 234. The inlet of the first straight channel 233 communicates with the first channel 220. The outlet of the second straight channel 234 communicates with the first channel 220. The third straight channel extends parallel to the axial direction X, and the inlet of the third straight channel 235 communicates directly with the outlet of the first straight channel 233. The outlet of the third straight channel 235 communicates directly with the inlet of the second straight channel 234.

[0071] In this embodiment, by additionally providing a third straight channel 235 parallel to the first channel 220 between the first straight channel 233 and the second straight channel 234, on the one hand, the length of the second channel 230 is increased, which is beneficial to ensuring that the core of the solid filamentary consumable can be fully heated and melted. On the other hand, the transition from the first straight channel 233 to the second straight channel 234 is more gentle, avoiding the blockage of the core of the solid filamentary consumable during advancement.

[0072] Further, in this embodiment, the number of inner bodies is three. The inner bodies include a first inner body 250, a second inner body 260, and a third inner body 270, where the third inner body 270 is located between the first inner body 250 and the second inner body 260.

[0073] The first inner body 250 is provided with a first straight channel 233, the second inner body 260 is provided with a second straight channel 234, and the third inner body 270 is provided with a third straight channel 235. After the three inner bodies are stacked, the first straight channel 233, the second straight channel 234, and the third straight channel 235 can jointly form the second channel 230.

[0074] The first inner body 250, the second inner body 260, and the third inner body 270 are also respectively provided with a first segment 222, a second segment 223, and a third segment 224 of the first channel 220, such that after the three inner bodies are docked with the outer body 240, the base segment 221, the first segment 222, the second segment 223, and the third segment 224 can jointly form the first channel 220.

[0075] In this embodiment, a protrusion 201 is provided at the top of the first inner body 250, and a mating hole 202 is provided on the outer body 240. A hole 202 is provided at the bottom of the first inner body 250, and a protrusion 201 is provided at the top of the third inner body 270. A hole 202 is provided at the bottom of the third inner body 270, and a protrusion 201 is provided at the top of the second inner body 260.

[0076] The above has described in detail by way of examples the cases where the second channel 230 includes two and three straight channels. It should also be noted that the second channel 230 can also be formed by splicing more than three straight channels.

[0077] In the present disclosure, when the second channel 230 is formed by splicing two or more straight line segments, the number of inner bodies is equal to the number of straight channels, and each inner body is respectively provided with a straight channel. In addition, a part of the first channel 220 is also respectively provided in the outer body 240 and each inner body.

[0078] Further, when a plurality of inner bodies are stacked, the inner body in axial contact with the outer body 240 in the X-axis direction is defined as the top inner body, and the inner body in axial contact with the nozzle body 10 in the X-axis direction is defined as the bottom inner body. One of any two adjacent inner bodies may be provided with a protrusion 201, and the other is provided with a matching hole 202. One of the top inner body and the outer body 240 may be provided with a protrusion 201, and the other is provided with a matching hole 202.

[0079] An embodiment of the second aspect of the present disclosure provides a 3D printer, which includes the hot melt nozzle 100 and the throat tube 320 of any one of the previous embodiments, and the throat tube 320 is communicated with the inlet channel 210.

[0080] When the 3D printer of the present disclosure is working, it can preheat the outer ring of the solid filamentary consumable through the inlet channel 210 to soften it, and then use the second channel 230 to separate the outer ring of the solid filamentary consumable from the core. The outer ring continues to be heated in the first channel 220 and is pushed to the nozzle body 10, and the core continues to be heated in the second channel 230 and is pushed to the first channel 220. By separating the outer ring, the heat conduction distance between the core and the heat conducting member 20 is reduced, so that the heat conducting member 20 can heat the core faster, thereby making the hot melt speed of the solid filamentary consumable faster and meeting the requirements of a higher extrusion rate.

[0081] In addition, the tapered section 2311 of the inlet 231 of the second channel 230 can guide the core of the solid filamentary consumable to advance into the second channel 230, and the opening diameter of the tapered section 2311 is larger than the outlet 212 of the inlet channel 210. In this way, even if the consumable is deflected after the outlet 212 of the inlet and outlet channel 210, it can still smoothly enter the second channel 230.

[0082] In addition, the heat conducting member 20 includes a plurality of inner bodies, which can be spliced to form the second channel 230, thereby facilitating the machining of each straight channel of the second channel 230.

[0083] In this disclosure, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0084] In this disclosure, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0085] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this disclosure are only for the purpose of illustration and do not represent the only implementation.

[0086] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0087] The above embodiments only represent several implementation manners of this disclosure, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the disclosed patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of this disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of this disclosure. Therefore, the protection scope of this disclosed patent shall be subject to the appended claims.

Claims

1. A hot melt nozzle, comprising a heat conducting member, wherein a first channel is provided in the heat conducting member, characterized in that, The heat conducting member further includes an inlet passage and a second passage; the top end of the first passage is closed; the inlet passage is obliquely communicated with the side wall of the first passage; the inlet of the second passage is located on the side wall of the first passage and faces the discharge port of the inlet passage; the outlet of the second passage is located on the side wall of the first passage or communicated with the conveying passage of the nozzle body; the diameter of the second passage is smaller than that of the inlet passage.

2. The hot melt nozzle according to claim 1, wherein, A tapered section is provided at the inlet of the second passage.

3. The hot melt nozzle according to claim 1, wherein, The second passage is an arc-shaped passage.

4. The hot melt nozzle according to claim 1, wherein, The second passage is a broken line passage, and the broken line passage includes at least two straight passages that are sequentially connected at an obtuse angle.

5. The hot melt nozzle according to claim 4, characterized in that, The second passage includes a first straight passage and a second straight passage that are connected at an obtuse angle. The inlet of the first straight passage is communicated with the discharge port of the inlet passage. The inlet of the second straight passage is directly opposite and communicated with the outlet of the first straight passage. The outlet of the second straight passage is communicated with the first passage.

6. The hot melt nozzle according to claim 5, characterized in that, The heat conducting member includes an outer body, a first inner body and a second inner body that are stacked inside the outer body; a part of the first passage is provided in each of the outer body, the first inner body and the second inner body. The first inner body and the second inner body are respectively provided with the first straight passage and the second straight passage.

7. The hot melt nozzle according to claim 5, characterized in that, A third straight passage is further provided between the first straight passage and the second straight passage. The inlet of the third straight passage is directly opposite and communicated with the outlet of the first straight passage. The outlet of the third straight passage is directly opposite and communicated with the inlet of the second straight passage. The heat conducting member includes an outer body, a first inner body, a second inner body that are stacked inside the outer body, and a third inner body provided between the first inner body and the second inner body. A part of the first passage is provided in each of the outer body, the first inner body, the second inner body and the third inner body. The first inner body, the second inner body and the third inner body are respectively provided with the first straight passage, the second straight passage and the third straight passage.

8. The hot melt nozzle according to claim 6 or 7, characterized in that: The hot melt nozzle further includes a nozzle body having a conveying passage, and the conveying passage is communicated with the first passage; the outer body is provided with a groove; the nozzle body is threadedly connected to the groove to fix each inner body inside the outer body.

9. The hot melt nozzle according to claim 6 or 7, characterized in that, A positioning mechanism is provided between at least two adjacent inner bodies and / or between the inner body and the outer body.

10. A 3D printer, characterized in that, It includes the hot melt nozzle and the throat tube according to any one of claims 1-9, and the throat tube is communicated with the inlet passage.

Images