Quick-melting nozzle for 3D printer, preheating member and preparation method

Abstract

The present disclosure relates to a quick-melting nozzle for a 3D printer, a preheating member and a preparation method. The nozzle comprises a nozzle body, wherein the nozzle body is externally connected to a heat source, consumables are melted in the nozzle body and extruded from a lower end of the nozzle body, a circulation channel is provided in the nozzle body in an axial direction of the nozzle body, a quick-melting portion is provided at a lower portion of the circulation channel and connected to the nozzle body, a gap is reserved between the quick-melting portion and an inner wall of the circulation channel, and the molten consumables circulate at the gap between the quick-melting portion and the inner wall of the circulation channel. In order to solve or at least alleviate the problem of being unable to fully melt the consumables in the nozzle while improving the extrusion efficiency of the nozzle of the 3D printer, the present disclosure provides a quick-melting nozzle for a 3D printer.

Description

Fast-melt nozzle, preheating component and preparation method for 3D printer

[0001] This disclosure claims priority to Chinese patent application number 2023118723343, filed with the Patent Office of China on December 31, 2023, entitled “A Fast-Melt Nozzle for a 3D Printer,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure belongs to the technical field of 3D printers, and in particular relates to a fast-melt nozzle, a preheating component, and a preparation method for a 3D printer. Background Art

[0003] 3D printing does not subtract material to create parts like traditional machining, but rather creates parts by adding material. Parts are manufactured using a 3D printer based on a digital model. The 3D printer melts the filament and extrude it from the printer nozzle. After the melted filament leaves the printer nozzle, it becomes solid, thus achieving 3D printing of the part.

[0004] The filament enters from the larger inlet hole at the top of the nozzle, is heated and melted in the nozzle connected to an external heat source, and is then extruded from the smaller outlet hole at the end of the nozzle.

[0005] In order to shorten printing time and improve printing efficiency, the extrusion efficiency of the nozzle outlet hole is increased. However, this will cause the filament to not be fully melted in the nozzle, thus reducing extrusion efficiency and affecting print quality, thus limiting the printing speed of the 3D printer. Summary of the Invention

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art, solve or at least alleviate the problem of insufficient melting of consumables in the nozzle when improving the extrusion efficiency of a 3D printer nozzle, and provide a fast-melt nozzle, preheating element, and preparation method for a 3D printer.

[0007] The present disclosure is achieved through the following technical solutions:

[0008] A fast-melt nozzle for a 3D printer includes a nozzle body, the nozzle body is externally connected to a heat source, consumables are melted inside the nozzle body and extruded from the lower end of the nozzle body, a circulation channel is provided in the nozzle body along its axial direction, a fast-melt portion is provided at the lower part of the circulation channel, the fast-melt portion is connected to the nozzle body, a gap is left between the fast-melt portion and the inner wall of the circulation channel, and the melted consumables flow in the gap between the fast-melt portion and the inner wall of the circulation channel.

[0009] In one embodiment, the fast-melting portion is in the shape of a vertically arranged flat plate, is radially arranged along the circulation channel, and has two ends connected to the inner wall of the circulation channel.

[0010] In one embodiment, the fast-melting portion includes two plates arranged in parallel and spaced apart from each other. The two plates are mirror-imaged relative to each other with the axial center plane of the flow channel as the center, and both ends of the plates are connected to the inner wall of the flow channel.

[0011] In one embodiment, the fast-melting portion includes a plurality of edges, which are arranged on the inner wall of the circulation channel along the height direction of the circulation channel. One side of the edge is connected to the inner wall of the circulation channel, and the other side extends toward the axis of the circulation channel. The top surface of the edge is a slope with a high outside and a low inside, and the plurality of edges are evenly distributed along the circumference of the circulation channel.

[0012] In one embodiment, the fast-melting part includes a tube body, which is coaxially arranged at the lower part of the circulation channel. A plate body is arranged between the tube body and the circulation channel. The plate body is radially arranged along the circulation channel. The two ends of the plate body are respectively connected to the outer wall of the tube body and the inner wall of the circulation channel. Multiple plates are evenly distributed along the circumference of the circulation channel.

[0013] In one embodiment, the fast-melting portion includes a spiral body having a columnar spiral structure, and the spiral body is coaxially fixedly arranged at the lower part of the flow channel.

[0014] In one embodiment, the fast-melting portion includes two cross-arranged plates, the two plates are arranged in a cross shape, and both ends of the plates are connected to the inner wall of the circulation channel.

[0015] In one embodiment, the fast-melting portion includes a column, which is arranged at the lower part of the circulation channel, the outer wall of the column is connected to the inner wall of the circulation channel, and a fast-melting hole is arranged in the middle of the column along its axial direction. The fast-melting hole is eccentrically arranged with respect to the circulation channel, and several fast-melting holes are evenly distributed around the circumference with the axis of the circulation channel as the center.

[0016] In one embodiment, the fast-melting portion includes a plurality of blocks, which are stacked longitudinally and staggered transversely in the lower part of the circulation channel. The blocks are fan-shaped, with downward raised strips provided at the circumference of the lower surface of the blocks. The circumferential side surfaces of the blocks are in contact with the inner wall of the circulation channel, and the lower surface of the raised strip of the block located above is in contact with the upper surface of the block located below.

[0017] In one embodiment, the nozzle also includes a preheating element, which is arranged at the front end of the flow channel of the nozzle body. A preheating channel is arranged in the middle of the preheating element along its axial direction. The lower end of the preheating channel is connected to the flow channel of the nozzle body, and the preheating element is heat-conducted and connected to the heat source.

[0018] In one embodiment, an introduction section is provided at the upper part of the preheating channel, and the preheating channel includes a removal section and several guide sections. The removal section and the introduction section are coaxially arranged, and the guide section is arranged on the outside of the removal section. The side of the guide section close to the removal section is connected to the removal section; the removal section is in the shape of a multi-step stepped hole with a larger upper part and a smaller lower part.

[0019] In one embodiment, a side wall of the nozzle body located in the cavity is provided with a concave capacity expansion groove, the capacity expansion groove is arranged along the height direction of the nozzle body, and a plurality of capacity expansion grooves are evenly distributed along the outer wall of the nozzle body.

[0020] In one embodiment, an opening and closing mechanism is provided at the lower portion of the flow channel of the nozzle body. When the opening and closing mechanism is in an open state, the lower end of the flow channel is open, and when the opening and closing mechanism is in a closed state, the lower end of the flow channel is closed.

[0021] The embodiment of the present disclosure further provides a preheating element, which is arranged at the front end of the flow channel of the nozzle body, and the preheating element is provided with a preheating channel along its axial direction.

[0022] In one embodiment, the preheating channel includes a removal section, which is coaxially arranged with the preheating channel and is used to remove the periphery of the consumable.

[0023] In one embodiment, the removal section is in a multi-step shape with a larger top and a smaller bottom.

[0024] In one embodiment, the cross-sectional profile of the removed section is in the shape of a quadrilateral.

[0025] In one embodiment, the cross-sectional profile of the removal section includes a plurality of arc segments located on the same circle, and a groove extending radially outward of the circle is formed between two adjacent arc segments.

[0026] In one embodiment, the preheating channel further includes at least one guide section, which is arranged parallel to the axis of the preheating channel and is used to guide the periphery of the consumables.

[0027] In one embodiment, the cross-sectional area of ​​the flow guide section is equal everywhere in the axial direction of the preheating channel.

[0028] In one embodiment, the cross-sectional profile of the guide section includes a plurality of sub-profiles, and the plurality of sub-profiles are symmetrically distributed about the axis of the preheating channel.

[0029] In one embodiment, the shape of each sub-contour is a "V" shape; or, the shape of each sub-contour is a circle.

[0030] In one embodiment, the cross-sectional profile of the guide section includes at least two circular arc segment sub-profiles, and the at least two circular arc segment sub-profiles are symmetrically distributed about the axis of the preheating channel.

[0031] In one embodiment, the cross-sectional profile of the guide section includes three vertex angles, which are symmetrically distributed about the axis of the preheating channel, and each vertex angle has the same angle and is an acute angle.

[0032] The embodiment of the present disclosure also provides a method for preparing a preheating part, which is used to prepare the preheating part of the above-mentioned embodiment. The preparation method includes: providing a column body made of high thermal conductivity material; preparing a first connecting channel for connecting to the throat at the upper part of the column body; preparing a second connecting channel for connecting to the nozzle body at the lower part of the column body; opening a stepped hole in the middle part of the column body, which is respectively connected to the first connecting channel and the second connecting channel; and opening a guide hole on the step of the stepped hole.

[0033] Through the above technical solution, the beneficial effects of the present disclosure are:

[0034] The fast-melt nozzle for a 3D printer provided in an embodiment of the present disclosure has a fast-melt portion provided at the lower portion of the flow channel of the nozzle body, which is thermally connected to the nozzle body. Through the combination of the fast-melt portion and the flow channel, the consumables in the flow channel are heated both inside and outside, and the heated area of ​​the consumables in the flow channel is increased, thereby improving the heat conduction between the nozzle body and the consumables, improving the melting efficiency, and ensuring that the consumables are melted efficiently and quickly in the nozzle.

[0035] By arranging a preheating part on the upper side of the circulation channel, the initial melting time of the consumables is shortened, and the melted consumables and the unmelted consumables can be separated in the preheating part, so that the preheating part can directly heat the unmelted consumables after separation, thereby improving the melting efficiency.

[0036] The nozzle body is provided with a capacity expansion groove, which together with the inner wall of the preheating part forms a bypass channel, which is conducive to reducing the pressure of the consumables passing through the quick-melt part, thereby facilitating the rapid extrusion of the consumables. The bypass channel also further increases the thermal contact area of ​​the consumables in the quick-melt part, further facilitating the rapid heating and melting of the consumables. Furthermore, because the bypass channel increases the thermal contact area of ​​the consumables in the quick-melt part, the consumables absorb the same amount of heat, and the heat conduction distance required in the quick-melt part will be shortened. Therefore, the quick-melt part of the present disclosure is relatively short, which is conducive to improving the stability of the movement of the nozzle body during the printing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic diagram of the structure of the present disclosure;

[0038] FIG2 is a transverse cross-sectional view of FIG1 of the present disclosure;

[0039] FIG3 is a second structural diagram of the present disclosure;

[0040] FIG4 is a transverse cross-sectional view of FIG3 of the present disclosure;

[0041] FIG5 is a third structural diagram of the present disclosure;

[0042] FIG6 is a transverse cross-sectional view of FIG5 of the present disclosure;

[0043] FIG7 is a fourth structural diagram of the present disclosure;

[0044] FIG8 is a transverse cross-sectional view of FIG7 of the present disclosure;

[0045] FIG9 is a fifth structural diagram of the present disclosure;

[0046] FIG10 is a transverse cross-sectional view of FIG9 of the present disclosure;

[0047] FIG11 is a schematic structural diagram of the fast-melting portion in FIG9 of the present disclosure;

[0048] FIG12 is a sixth structural diagram of the present disclosure;

[0049] FIG13 is a transverse cross-sectional view of FIG12 of the present disclosure;

[0050] FIG14 is a seventh structural diagram of the present disclosure;

[0051] FIG15 is a transverse cross-sectional view of FIG14 of the present disclosure;

[0052] FIG16 is an eighth structural diagram of the present disclosure;

[0053] FIG17 is a transverse cross-sectional view of FIG16 of the present disclosure;

[0054] FIG18 is a schematic structural diagram of the fast-melting portion in FIG16 of the present disclosure;

[0055] FIG19 is a schematic diagram of the structure of the preheating element of the present disclosure;

[0056] FIG20 is a schematic cross-sectional view of a diversion section according to the present disclosure;

[0057] FIG21A is a second schematic cross-sectional view of the diversion section of the present disclosure;

[0058] FIG21B is a third schematic cross-sectional view of the diversion section of the present disclosure;

[0059] FIG21C is a fourth schematic cross-sectional view of the diversion section of the present disclosure;

[0060] FIG21D is a fifth schematic cross-sectional view of the diversion section of the present disclosure;

[0061] FIG21E is a sixth schematic cross-sectional view of the diversion section of the present disclosure;

[0062] FIG22 is a second schematic structural diagram of the preheating element disclosed herein;

[0063] FIG23 is a top view of FIG22 of the present disclosure;

[0064] FIG24 is a third structural schematic diagram of the preheating element disclosed herein;

[0065] FIG25 is a top view of FIG24 of the present disclosure;

[0066] FIG26 is a ninth structural diagram of the present disclosure;

[0067] FIG27 is a cross-sectional view taken at AA in FIG26 of the present disclosure;

[0068] FIG28 is a tenth structural diagram of the present disclosure;

[0069] FIG29 is a schematic diagram of the structure of the present disclosure;

[0070] FIG30 is a schematic structural diagram of the opening and closing panel of the present invention in a closed state;

[0071] FIG31 is a schematic structural diagram of the opening and closing panel of the present invention in an open state;

[0072] FIG32 is a twelfth structural diagram of the present disclosure;

[0073] Among them: 1-nozzle body; 1a-capacity expansion groove; 2-circulation channel; 3-fast melting part; 4-preheating part; 41-first connecting section; 41a-first connecting channel; 42-second connecting section; 42a-second connecting channel; 5-preheating channel; 51-removal section; 52-diversion section; 521, 522-arc segment sub-contour; 523-rectangular groove; 524-sub-contour; 525-vertex; 6-opening and closing ball; 7-opening and closing plate; 8-opening and closing block; 9-throat; 10-diversion hole. DETAILED DESCRIPTION

[0074] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0075] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0076] Example 1:

[0077] As shown in Figures 1 to 18, a fast-melt nozzle for a 3D printer includes a nozzle body 1, which is externally connected to a heat source. The consumable material is melted in the nozzle body 1 and extruded from the lower end of the nozzle body 1. A circulation channel 2 is provided in the nozzle body 1 along its axial direction, and a fast-melt portion 3 is provided at the lower part of the circulation channel 2. The fast-melt portion 3 is connected to the nozzle body 1, and a gap is left between the fast-melt portion 3 and the inner wall of the circulation channel 2. The melted consumable material flows in the gap between the fast-melt portion 3 and the inner wall of the circulation channel 2.

[0078] The quick-melting part can be integrally formed with the nozzle body, or can be fixedly connected to the nozzle body.

[0079] The present invention discloses a fast-melt nozzle for a 3D printer. A fast-melt portion 3 is provided at the lower portion of a flow channel 2 of a nozzle body 1. The fast-melt portion 3 is thermally connected to the nozzle body 1. Through the combination of the fast-melt portion 3 and the flow channel 2, the consumables in the flow channel 2 are heated both inside and outside, and the heated area of ​​the consumables in the flow channel 2 is increased, thereby improving the heat conduction between the nozzle body 1 and the consumables, directly heating the parts of the consumables that are not easily heated, improving the melting efficiency, and ensuring that the consumables are efficiently and quickly melted in the nozzle.

[0080] As shown in Figures 1 and 2, in one implementation plan of this embodiment, the fast-melting portion 3 is in the shape of a vertically arranged flat plate, and the fast-melting portion 3 is radially arranged along the circulation channel 2, with both ends of the fast-melting portion 3 connected to the inner wall of the circulation channel 2; the flat-plate-shaped fast-melting portion 3 facilitates cutting the consumable from the middle, dividing the consumable into two independent heating areas, thereby increasing the overall heating area; in a more optimized structure, the upper end of the flat-plate-shaped fast-melting portion 3 is in the shape of a blade, which makes it easier to divide the consumable.

[0081] As shown in Figures 3 and 4, in order to further increase the heating area, the fast-melting part 3 includes two parallel and spaced plates. The two plates are mirror-imaged with the axial center plane of the circulation channel 2 as the center, and the two ends of the plates are connected to the inner wall of the circulation channel 2.

[0082] As shown in Figures 5 and 6, in order to peel off the melted part on the outside of the consumable and facilitate heating of the parts inside the consumable that are not easily exposed to heat, the quick-melting part 3 includes a plurality of edges, which are arranged on the inner wall of the circulation channel 2 along the height direction of the circulation channel 2. One side of the edge is connected to the inner wall of the circulation channel 2, and the other side extends toward the axis of the circulation channel 2. The top surface of the edge is an inclined surface with a high outside and a low inside, and the plurality of edges are evenly distributed along the circumference of the circulation channel 2.

[0083] As shown in Figures 7 and 8, another implementation scheme of this embodiment, in order to facilitate the peeling of the melted part on the outside of the consumable and increase the heated area, the fast-melting part 3 includes a tube body, which is coaxially arranged at the lower part of the circulation channel 2, and a plate body is arranged between the tube body and the circulation channel 2. The plate body is radially arranged along the circulation channel 2, and the two ends of the plate body are respectively connected to the outer wall of the tube body and the inner wall of the circulation channel 2, and multiple plates are evenly distributed along the circumference of the circulation channel 2; the inner cross-sectional area of ​​the tube body is smaller than the cross-sectional area of ​​the consumable. When the consumable passes through the fast-melting part 3, the melted part on the outside of the consumable is peeled off from the outside of the tube body, and the unmelted part inside the consumable enters the tube body. At the same time, the tube body and the plate body are thermally connected to the nozzle body 1, which greatly increases the heated area.

[0084] As shown in Figures 9 to 11, in another implementation scheme of this embodiment, the fast-melting part 3 includes a helix, which has a columnar spiral structure and is coaxially fixed to the lower part of the circulation channel 2; the outer surface area of ​​the helix is ​​large, which increases the heating area. At the same time, the spiral structure will drive the molten consumables to flow in a spiral, thereby improving the uniformity of heating.

[0085] As shown in FIG12 and FIG13 , in order to more fully cut the consumables, the fast-melting part 3 includes two cross-arranged plates. The two plates are arranged in a cross shape, and both ends of the plates are connected to the inner wall of the circulation channel 2 .

[0086] As shown in Figures 14 and 15, in another implementation scheme of this embodiment, both the upper and lower surfaces of the column can be heated, and the fast-melting portion 3 includes a column, which is arranged at the lower part of the circulation channel 2, and the outer wall of the column is connected to the inner wall of the circulation channel 2. A fast-melting hole is provided in the middle of the column along its axial direction, and the fast-melting hole is eccentrically arranged with the circulation channel 2, and a plurality of fast-melting holes are evenly distributed around the circumference with the axis of the circulation channel 2 as the center.

[0087] As shown in Figures 16 to 18, in order to increase the heating time, the fast-melting part 3 includes a plurality of blocks, which are stacked longitudinally and staggered laterally in the lower part of the circulation channel 2. The blocks are fan-shaped, with a downward raised strip provided at the circumference of the lower surface of the block. The circumferential side of the block is in contact with the inner wall of the circulation channel 2, and the lower surface of the raised strip of the block located above is in contact with the upper surface of the block located below. An S-shaped channel is formed between the multiple blocks, which increases the heating path, thereby increasing the heating time in disguise and ensuring sufficient melting.

[0088] Example 2:

[0089] The nozzle also includes a preheating part 4, which is arranged at the front end of the flow channel 2 of the nozzle body 1. A preheating channel 5 is arranged in the middle of the preheating part 4 along its axial direction. The lower end of the preheating channel 5 is connected to the flow channel 2 of the nozzle body 1, and the preheating part 4 is heat-conducted and connected to the heat source.

[0090] The preheating element 4 can be arranged on the upper side of the flow channel 2 to preheat the consumables. In addition, the melted consumables can be separated from the unmelted consumables in the preheating element 4, so that the preheating element 4 directly heats the unmelted consumables after separation, which can further improve the melting efficiency.

[0091] As shown in Figures 19 and 20, to optimize the product structure, a cylindrical inlet section is provided at the top of the preheating channel 5. The preheating channel 5 includes a removal section 51 and several guide sections 52. The removal section 51 has a circular segment cross-section and is coaxial with the inlet section. Two guide sections are mirror images arranged on either side of the removal section. The guide sections have a circular segment cross-section, with the circular surface of the guide section located away from the removal section and tangent to the inner wall of the inlet section. The side of the guide section close to the removal section is connected to the removal section. Furthermore, the removal section has a multi-stepped hole shape, with a larger top and a smaller bottom. During preheating, the melted portion of the consumables is gradually peeled off by the stepped hole structure of the removal section and then flows down through the guide section.

[0092] As shown in Figures 26 and 27, in one embodiment, in order to increase the capacity of the nozzle, a section of the side wall of the nozzle body 1 located in the cavity may be provided with a concave capacity expansion groove 1a, and the capacity expansion groove 1a is arranged along the height direction of the nozzle body 1. Several capacity expansion grooves 1a are evenly distributed along the outer wall of the nozzle body 1 to increase the capacity of the nozzle.

[0093] Example 3:

[0094] The present disclosure further provides a preheating element 4. As shown in Figures 19 and 20, the preheating element 4 is disposed at the front end of the flow channel of the nozzle body 1, and the preheating element 4 is provided with a preheating channel 5 along its axial direction.

[0095] In some examples, the upper portion of the preheating element 4 may be provided with a first connecting section 41 for connecting to the throat 9, and the interior of the first connecting section 41 may be defined as a first connecting channel 41a that is in communication with the preheating channel 5; the lower portion of the preheating element 4 may be provided with a second connecting section 42 for connecting to the nozzle body 1, and the interior of the second connecting section 42 may be defined as a second connecting channel 42a that is in communication with the preheating channel 5; wherein the cross-sectional area of ​​the first connecting channel 41a may be smaller than the cross-sectional area of ​​the second connecting channel 42a.

[0096] In one embodiment, the preheating channel 5 may include a removal section 51, which is coaxially arranged with the preheating channel 5 and is used to remove the periphery of the consumables.

[0097] As shown in Figures 19 and 20, in one embodiment, the removal section 51 may have a multi-stepped shape with a larger top and a smaller bottom. For example, the removal section 51 may include a plurality of sequentially connected stepped holes, the lowest of which may be connected to the second connecting channel 42a. After the outer periphery of the consumable is stripped, the remaining consumable core may flow into the second connecting channel 42a through the lowest stepped hole.

[0098] As shown in Figures 22 and 23, in one embodiment, the cross-sectional profile of the removal section 51 may be a quadrilateral. For example, the cross-sectional profile of the removal section 51 may be a quadrilateral such as a square, a rhombus, or a rectangle. The cross-sectional profile of the removal section 51 may be a quadrilateral inscribed within the cross-sectional profile of the preheating channel 5.

[0099] In one embodiment, the preheating channel 5 may further include at least one guide section 52, which is arranged parallel to the axis of the preheating channel 5 and is used to guide the periphery of the consumables. In some examples, the softened portion of the consumable periphery during preheating can be gradually peeled off by the stepped hole structure of the removal section 51, and flowed down through the guide section 52.

[0100] In one embodiment, the cross-sectional area of ​​the flow guide section 52 may be equal everywhere in the axial direction of the preheating channel 5 .

[0101] In one embodiment, the cross-sectional profile of the guide section 52 may include a plurality of sub-profiles 524 , and the plurality of sub-profiles 524 may be symmetrically distributed about the axis of the preheating channel 5 .

[0102] In one embodiment, the shape of each sub-contour 524 may be a “V” shape; or, the shape of each sub-contour 524 may be a circle.

[0103] In some examples, as shown in Figure 21B, the shape of each sub-contour 524 may be "V"-shaped. Preferably, the cross-sectional profile of the guide section 52 may include four "V"-shaped sub-contours 524. The softened outer periphery of the consumable can be removed by the removal section 51 and can flow down through the "V"-shaped sub-contours 524.

[0104] In other examples, as shown in Figure 21C, the shape of each sub-contour 524 may be circular. Preferably, the cross-sectional profile of the guide section 52 may include four circular sub-contours 524, and the outer periphery of the melted consumable can be removed by the removal section 51 and can flow down through the four circular sub-contours 524.

[0105] As shown in Figure 21D, the shape of each sub-contour 524 can be circular. Preferably, the cross-sectional contour of the guide section 52 can include four circular sub-contours 524. The periphery of the melted consumable can be gradually peeled off by the stepped structure of the removal section 51 and flow down through the guide section 52.

[0106] In one embodiment, the cross-sectional profile of the guide section 52 may include at least two circular arc segment sub-profiles, and the at least two circular arc segment sub-profiles may be symmetrically distributed about the axis of the preheating channel 5 .

[0107] In some examples, as shown in FIG20 , the cross-sectional profile of the guide section 52 may include two arc segment sub-profiles 521 , the two arc segment sub-profiles 521 may be symmetrically distributed about the axis of the preheating channel 5 , and the arc segment sub-profiles 521 may be major arcs.

[0108] In other examples, as shown in Figure 21A, the cross-sectional profile of the removal section 51 can be circular, and the cross-sectional profile of the guide section 52 can include three arc segment sub-profiles 522. The three arc segment sub-profiles 522 can be symmetrically distributed about the axis of the preheating channel 5, and the arc segment sub-profiles 522 can be a minor arc or a semicircle.

[0109] As shown in Figure 21E, in one embodiment, the cross-sectional profile of the removal section 51 may be in the shape of a circular segment, and the cross-sectional profile of the guide section 52 may include three vertex angles 525. The three vertex angles 525 may be symmetrically distributed about the axis of the preheating channel 5, and the angle of each vertex angle 525 is the same and is an acute angle.

[0110] As shown in Figures 24 and 25, in one embodiment, the cross-section of the removal section 51 may include multiple arc segments located on the same circle, and a rectangular groove 523 extending radially outward along the circle is formed between two adjacent arc segments. The multiple rectangular grooves 523 constitute the guide section 52.

[0111] Example 4:

[0112] The present disclosure also provides a method for preparing a preheating element 4, which is used to prepare the preheating element 4 in the above embodiment of the present disclosure. As shown in Figures 19 and 20, the preparation method may include the following steps:

[0113] S1: Provide a column body made of high thermal conductivity material.

[0114] In some examples, the column body may be made of a metal thermally conductive material to provide mechanical strength while enabling preheating of the consumables.

[0115] S2: A first connecting channel 41 for connecting with the throat pipe 9 is prepared at the upper portion of the column body.

[0116] In some examples, a connection hole for connecting to the throat pipe 9 can be formed in the upper portion of the column body, and the connection hole can form the first connection channel 41. The throat pipe 9 and the first connection channel 41 can be connected by interference fit or threaded connection. The embodiment of the present disclosure does not specifically limit the connection method between the throat pipe 9 and the first connection channel 41.

[0117] S3: A second connecting channel 42 for connecting with the nozzle body 1 is prepared at the lower portion of the cylinder body.

[0118] In some examples, a connection hole for connecting to the nozzle body 1 can be formed in the lower portion of the column body, and the connection hole can form the second connection channel 42. The nozzle body 1 and the second connection channel 42 can be connected by an interference fit or a threaded connection. The disclosed embodiments do not specifically limit the connection method between the nozzle body 1 and the second connection channel 42.

[0119] S4: preparing a multi-step stepped hole in the middle of the column body, which is connected to the first connecting channel 41 and the second connecting channel 42 respectively.

[0120] In some examples, a circular stepped hole may be prepared between the first connecting channel 41 and the second connecting channel 42 as the removal section 52 , wherein the number of steps may be 1 to 3, as shown in FIG19 , and the number of steps may preferably be 3.

[0121] S5: A guide hole 10 is opened through the column body, and the guide hole 10 and the multi-stepped holes together form a path for the consumables to flow.

[0122] In some examples, the number of diversion holes 10 can be set to 1 to 4. As shown in FIG20 , the number of diversion holes 10 can be preferably 2. The shape of the diversion holes 10 can be circular or other irregular shapes. As shown in FIG20 , the shape of the diversion holes 10 can be preferably circular. Each diversion hole 10 can be preferably connected to the circular hole surrounded by the lowest step, or it can be disconnected. When connected, the resistance to feeding the consumables is reduced.

[0123] Example 5:

[0124] As shown in FIG28 , an opening and closing mechanism is provided at the lower portion of the flow channel 2 of the nozzle body 1 . When the opening and closing mechanism is in an open state, the lower end of the flow channel 2 is open, and when the opening and closing mechanism is in a closed state, the lower end of the flow channel 2 is closed.

[0125] The current nozzle only prevents leakage by withdrawing the consumables, but the melted consumables in the nozzle are still in the nozzle. This part of the consumables will still flow out of the nozzle, resulting in a certain amount of leakage. The present invention is provided with an opening and closing mechanism, which can close the nozzle when discharge is not required to prevent leakage.

[0126] In one embodiment of this embodiment, a truncated cone-shaped upper cavity with a smaller top and a larger bottom is provided at the center of the lower end of the fast-melting portion 3. A truncated cone-shaped lower cavity with a larger top and a smaller bottom is provided at a section of the flow channel 2 of the nozzle body 1 located below the fast-melting portion 3. The lower end of the flow channel 2 is in the shape of a tapered hole with a larger top and a smaller bottom.

[0127] The opening and closing mechanism includes an opening and closing ball 6 and a spring. The opening and closing ball 6 is located in the space formed by the upper cavity and the lower cavity. The spring is located below the opening and closing ball 6. The upper and lower ends of the spring respectively abut against the opening and closing ball 6 and the lower part of the flow channel 2.

[0128] When the molten consumable flows downward, the flow of the molten consumable causes the opening and closing ball 6 to move downward, and the opening and closing mechanism is in an open state; when the molten consumable does not flow downward, the spring drives the opening and closing ball 6 upward to the upper cavity, and the opening and closing mechanism is in a closed state.

[0129] As shown in Figures 29-31, another embodiment of this embodiment includes an opening and closing mechanism comprising an opening and closing plate 7 made of an elastic material. The opening and closing plate 7 is disposed transversely and its periphery is sealed and fixedly connected to the inner wall of the circulation channel 2. A disconnecting slit is provided in the middle of the opening and closing plate 7, which divides the middle portion of the opening and closing plate 7 into a plurality of opening and closing segments.

[0130] When the molten consumables flow downward, the flow of the molten consumables causes the opening and closing section to fold downward, and the opening and closing mechanism is in an open state; when the molten consumables do not flow downward, the elastic force of the opening and closing plate 7 itself causes the opening and closing section to maintain a horizontal state, and the opening and closing mechanism is in a closed state.

[0131] As shown in Figure 32, another implementation of this embodiment, the opening and closing mechanism includes an opening and closing block 8 made of elastic material, the opening and closing block 8 is arranged horizontally and its periphery is sealed and fixedly connected to the inner wall of the circulation channel 2, and a conical opening and closing hole with a larger upper part and a smaller lower part is provided in the middle of the opening and closing block 8; when the molten consumable flows downward, the flow of the molten consumable causes the lower end of the opening and closing hole to open outward, and the opening and closing mechanism is in an open state; when the molten consumable does not flow downward, the elastic force of the opening and closing block 8 itself causes the lower end of the opening and closing hole to close inward, and the opening and closing mechanism is in a closed state.

[0132] Example 6:

[0133] As shown in FIG28 , the nozzle includes a nozzle body 1, which is externally connected to a heat source. The consumable material is melted inside the nozzle body 1 and extruded from the lower end of the nozzle body 1. A flow channel 2 is provided in the nozzle body 1 along its axial direction. A fast-melting portion 3 is provided at the lower portion of the flow channel 2. The fast-melting portion 3 is connected to the nozzle body 1. A gap is left between the fast-melting portion 3 and the inner wall of the flow channel 2. The melted consumable material flows in the gap between the fast-melting portion 3 and the inner wall of the flow channel 2.

[0134] The nozzle further includes a preheating element 4, which is arranged at the front end of the flow channel 2 of the nozzle body 1. A preheating channel 5 is arranged in the middle of the preheating element 4 along its axial direction. The lower end of the preheating channel 5 is connected to the flow channel 2 of the nozzle body 1. The preheating element 4 is heat-conductingly connected to the heat source;

[0135] An opening and closing mechanism is provided at the lower portion of the flow channel 2 of the nozzle body 1. When the opening and closing mechanism is in an open state, the lower end of the flow channel 2 is open, and when the opening and closing mechanism is in a closed state, the lower end of the flow channel 2 is closed.

[0136] Finally, it should be noted that the above are merely embodiments of the present disclosure and are not intended to limit the present disclosure. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A fast-melting nozzle for a 3D printer, the nozzle comprising a nozzle body (1), the nozzle body (1) being externally connected to a heat source, and the consumable being melted in the nozzle body (1) and extruded from the lower end of the nozzle body (1), characterized in that, A flow passage (2) is axially arranged inside the nozzle body (1). A quick-melting part (3) is arranged at the lower part of the flow passage (2). The quick-melting part (3) is connected to the nozzle body (1), and there is a gap between the quick-melting part (3) and the inner wall of the flow passage (2). The molten consumable material flows through the gap between the quick-melting part (3) and the inner wall of the flow passage (2).

2. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) is in the shape of a vertically arranged flat plate. The quick-melting part (3) is arranged radially along the flow passage (2), and both ends of the quick-melting part (3) are connected to the inner wall of the flow passage (2).

3. The quick-melting nozzle for 3D printers according to claim 1, characterized in that, The quick-melting part (3) includes two plate bodies arranged in parallel at intervals. The two plate bodies are arranged in a relative mirror image with the axial central plane of the flow passage (2) as the center, and both ends of the plate bodies are connected to the inner wall of the flow passage (2).

4. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) includes a plurality of prism blocks. The prism blocks are arranged on the inner wall of the flow passage (2) along the height direction of the flow passage (2). One side of the prism block is connected to the inner wall of the flow passage (2), and the other side extends towards the axis of the flow passage (2). The top surface of the prism block is an inclined surface that is higher on the outside and lower on the inside. A plurality of prism blocks are evenly distributed in a circumferential direction along the flow passage (2).

5. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) includes a pipe body. The pipe body is arranged at the lower part of the flow passage (2). A plate body is arranged between the pipe body and the flow passage (2). The plate body is arranged radially along the flow passage (2), and both ends of the plate body are respectively connected to the outer wall of the pipe body and the inner wall of the flow passage (2). A plurality of plate bodies are evenly distributed in a circumferential direction along the flow passage (2).

6. The quick-melting nozzle for 3D printer according to claim 1, characterized in that The quick-melting part (3) includes a spiral body. The spiral body is in a columnar spiral structure, and the spiral body is fixedly arranged at the lower part of the flow passage (2).

7. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) includes two intersecting plate bodies. The two plate bodies are arranged in a cross shape, and both ends of the plate bodies are connected to the inner wall of the flow passage (2).

8. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) includes a column body. The column body is arranged at the lower part of the flow passage (2). The outer wall of the column body is connected to the inner wall of the flow passage (2). A quick-melting hole is axially arranged in the middle of the column body. The quick-melting hole is eccentrically arranged with respect to the flow passage (2). A plurality of quick-melting holes are evenly distributed in a circumferential direction with the axis of the flow passage (2) as the center.

9. The quick-melting nozzle for 3D printer according to claim 1, characterized in that, The quick-melting part (3) includes a plurality of blocks. The plurality of blocks are longitudinally stacked and horizontally staggered and arranged in the lower inner part of the flow passage (2). The blocks are in the shape of a semi-circular fan. A downward protruding strip is arranged at the circumferential part of the lower surface of the block. The circumferential side surface of the block fits against the inner wall of the flow passage (2). The lower surface of the protruding strip of the block located above fits against the upper surface of the block located below.

10. The quick-melting nozzle for 3D printer according to any one of claims 1-9, characterized in that, The nozzle further includes a preheating part (4). The preheating part (4) is arranged at the front end of the flow passage (2) of the nozzle body (1). A preheating passage (5) is axially arranged in the middle of the preheating part (4). The lower end of the preheating passage (5) communicates with the flow passage (2) of the nozzle body (1). The preheating part (4) is thermally connected to a heat source.

11. The quick-melting nozzle for 3D printers according to claim 10, characterized in that, An introduction section is provided at the upper part of the preheating channel (5). The preheating channel (5) includes a removal section (51) and a plurality of diversion sections (52). The removal section (51) is coaxially arranged with the introduction section. The diversion sections (52) are arranged outside the removal section (21), and one side of the diversion section (52) close to the removal section (51) communicates with the removal section (51). The removal section (51) is in the shape of a multi-step stepped hole with a larger upper part and a smaller lower part.

12. The quick-melting nozzle for 3D printer according to claim 11, characterized in that, An inwardly concave volume increasing groove (1a) is provided on a side wall of a section of the nozzle body (1) located inside the cavity. The volume increasing groove (1a) is arranged along the height direction of the nozzle body (1), and a plurality of volume increasing grooves (1a) are evenly distributed along the outer wall of the nozzle body (1).

13. The quick-melting nozzle for 3D printers according to any one of claims 1-9, characterized in that, An opening and closing mechanism is provided at the lower part of the flow passage (2) of the nozzle body (1). When the opening and closing mechanism is in the open state, the lower end of the flow passage (2) is open, and when the opening and closing mechanism is in the closed state, the lower end of the flow passage (2) is closed.

14. A preheating member, characterized in that, The preheating member (4) is arranged at the front end of the flow passage (2) of the nozzle body (1), and a preheating channel (5) is arranged along the axis thereof.

15. The preheating member according to claim 14, wherein The preheating channel (5) includes a removal section (51), and the removal section (51) is coaxially arranged with the preheating channel (5). The removal section (51) is used to remove the outer periphery of the consumable.

16. The preheating member according to claim 14, characterized in that, The removal section (51) is in the shape of a multi-step stepped shape with a larger upper part and a smaller lower part.

17. The preheating member according to claim 14, wherein The shape of the cross-sectional profile of the removal section (51) is a quadrilateral.

18. The preheating member according to claim 14, wherein The cross-sectional profile of the removal section (51) includes a plurality of arc segments located on the same circle, and a groove extending radially outward along the circle is formed between adjacent two of the arc segments.

19. The preheating member according to claim 14, characterized in that, The preheating channel (5) further includes at least one diversion section (52). The diversion section (52) is arranged parallel to the axis of the preheating channel (5), and the diversion section (52) is used to divert the outer periphery of the consumable.

20. The preheating member according to claim 19, wherein The cross-sectional area of the diversion section (52) is equal everywhere along the axis of the preheating channel (5).

21. The preheating member according to claim 19, wherein, The cross-sectional profile of the diversion section (52) includes a plurality of sub-profiles (524), and the plurality of sub-profiles (524) are symmetrically distributed about the axis of the preheating channel (5).

22. The preheating member according to claim 21, wherein The shape of each sub-profile (524) is a "V" shape; or, the shape of each sub-profile (524) is a circle.

23. The preheating member according to claim 19, wherein The cross-sectional profile of the diversion section (52) includes at least two arc sub-profiles, and the at least two arc sub-profiles are symmetrically distributed about the axis of the preheating channel (5).

24. The preheating member according to claim 19, characterized in that, The cross-sectional profile of the diversion section (52) includes three apex angles (525), and the three apex angles (525) are symmetrically distributed about the axis of the preheating channel (5). Each apex angle (525) has the same angle and is an acute angle.

25. A method for preparing a preheating member, characterized in that, For preparing the preheating member according to any one of claims 14 to 24, the preparation method includes: Providing a columnar body made of a high thermal conductivity material; Preparing a first connection channel (41a) for connecting with the throat tube (9) at the upper part of the columnar body; Preparing a second connection channel (42a) for connecting with the nozzle body (1) at the lower part of the columnar body; A stepped hole communicating with the first connection channel (41a) and the second connection channel (42a) respectively is formed in the middle of the column body main body; A diversion hole (10) is formed in the step of the stepped hole.

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