Consumable melting device for 3D printer and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, and discloses a consumable melting device for a 3D printer and the 3D printer, the consumable melting device comprises a body and at least one offset piece, and the body is internally provided with a first channel; the bias part is obliquely arranged in the first channel, one end of the bias part is fixed to the inner wall of the first channel, and the other end of the bias part extends towards the center of the first channel and forms a gap with the inner wall of the first channel. The offset part is arranged in the first channel, the softened part on the periphery of the consumable can be effectively stripped, meanwhile, the stripped consumable is bent to be closer to the offset part and the inner wall of the first channel, the distance between the core of the consumable and a heat source is reduced, and the melting efficiency of the core of the consumable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to a consumable material melting device for a 3D printer and the 3D printer. Background Art

[0002] Fused Deposition Modeling (FDM) 3D printers are becoming increasingly popular. The consumables (i.e., printing materials) used in FDM 3D printers are typically thermoplastic materials, such as wax, ABS, and nylon, supplied in filament form. Under external pressure, the solid filament enters the nozzle, where it is heated and melted, and extruded from the nozzle outlet, gradually accumulating layer by layer to create a 3D model.

[0003] Currently, the structure for melting consumables in FDM-type 3D printers generally includes a flow channel to facilitate melting of the consumables. This flow channel is composed of a first flow channel and a second flow channel, with multiple first flow channels arranged circumferentially along the second flow channel. The provision of multiple flow channels improves the efficiency of consumable melting. However, with this arrangement, when the consumable is melted, the softened material wraps around the outside of the core, making it impossible for the flow channels to effectively remove the softened material. This also results in poor thermal conductivity from the outside of the consumable to the core, resulting in low melting efficiency of the consumable core. Utility Model Content

[0004] The purpose of the utility model is to provide a consumable material melting device for a 3D printer and a 3D printer, so as to peel off the softened material on the outside of the consumable material core and improve the melting efficiency of the consumable material core.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] One aspect of the present utility model is to provide a consumable material melting device for a 3D printer, comprising a main body having a first channel therein; and further comprising at least one biasing member, the biasing member being obliquely arranged in the first channel, one end of the biasing member being fixed to the inner wall of the first channel, and the other end of the biasing member extending toward the center of the first channel and forming a gap with the inner wall of the first channel.

[0007] In some embodiments, the end of the biasing member extending toward the center of the first channel has a sharp edge.

[0008] In some embodiments, the biasing member is elastic.

[0009] In some embodiments, the included angle α between the biasing member and the inner wall of the first channel satisfies: 30°≤α≤90°.

[0010] In some embodiments, the biasing member is fixed to the inner wall of the first channel through a heat conducting member, the heat conducting member is inserted into the body close to the inner wall of the first channel, and the biasing member is integrally provided on the heat conducting member.

[0011] In some embodiments, the cross-section of the heat conducting element is circular, square, or polygonal.

[0012] In some embodiments, the cross-section of the heat conducting member is a quadrilateral; and the biasing member is a quadrilateral plate.

[0013] In some embodiments, the gap includes a first gap and a second gap; the first gap is formed between the end edge of the quadrilateral plate and the inner wall of the first channel; the second gap is formed between the side edge of the quadrilateral plate and the inner wall of the first channel.

[0014] In some embodiments, the first gap width is 0.1 mm to 1.7 mm; the second gap width is 0.1 mm to 0.8 mm.

[0015] In some embodiments, there are at least two biasing members, and the at least two biasing members are staggered in the first channel, and the width of each gap decreases successively along the flow direction of the consumables in the first channel.

[0016] In some embodiments, the body also includes a second channel connected to the first channel, the second channel is arranged at the inlet end of the first channel, the cross-sectional area of the second channel is less than or equal to the cross-sectional area of the first channel, and the cross-sectional area of the second channel is a closed figure surrounded by multiple arc edges.

[0017] Another aspect of the present invention is to provide a 3D printer, comprising:

[0018] The consumable material melting device for a 3D printer as described above;

[0019] a throat connected to the inlet end of the body of the consumable melting device and in communication with the first channel; and

[0020] The nozzle is connected to the outlet end of the body in the consumable melting device and is communicated with the first channel.

[0021] Compared with the prior art, the consumable material melting device for a 3D printer and the 3D printer according to the embodiment of the utility model have the following beneficial effects:

[0022] The consumable material melting device for a 3D printer of an embodiment of the present utility model is configured by arranging a biasing member in the first channel. After the consumable material contacts the biasing member in the first channel, on the one hand, under the blocking action of the biasing member, the consumable material propulsion path is deflected and comes close to the inner wall of the biasing channel, thereby accelerating the softening of the consumable material by heat. On the other hand, under the scraping action of the end of the biasing member, the softened portion on the outside of the consumable material is peeled off, so that the softened portion on the outside of the consumable material is separated from the core of the consumable material. After the softened portion is peeled off, the hard consumable material will directly contact the biasing member and absorb heat at a close distance, so that the core of the consumable material is closer to the heat source, thereby accelerating the heat melting of the core of the consumable material. Therefore, by arranging a biasing member in the first channel, the present application can effectively peel off the softened portion on the outside of the consumable material, reduce the distance between the core of the consumable material and the heat source, and at the same time make the consumable material after peeling bend closer to the inner wall of the first channel, thereby improving the melting efficiency of the core of the consumable material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a consumable melting structure for a 3D printer according to an embodiment of the present application;

[0024] Figure 2 yes Figure 1 Schematic diagram of the body in the molten structure of the consumable shown in;

[0025] Figure 3 yes Figure 1 Schematic diagram of the heat conducting member and the biasing member in the consumable melting structure shown in FIG;

[0026] Figure 4 Consumables are Figure 1 Schematic diagram of flow within the heat conducting member in the consumable melting structure shown in FIG;

[0027] Figure 5 is a schematic diagram of a consumable melting structure for a 3D printer according to another embodiment of the present application;

[0028] Figure 6 yes Figure 5 Schematic diagram of the body in the molten structure of the consumable shown in;

[0029] Figure 7 Consumables are Figure 5 Schematic diagram of the flow in the first channel of the consumable melting structure shown in Figure 1 ;

[0030] Figure 8 Consumables are Figure 5 Schematic diagram of the flow in the first channel of the consumable melting structure shown in Figure 2 ;

[0031] Figure 9 yes Figure 5 A schematic side view of a heat conducting member and a biasing member in the consumable melting structure shown in FIG;

[0032] Figure 10 Schematic diagram of a consumable melting structure for a 3D printer according to another embodiment of the present application;

[0033] Figure 11 yes Figure 10 Schematic diagram of the body in the molten structure of the consumable shown in;

[0034] Figure 12 yes Figure 10 Schematic diagram of the thermal conductive parts and biasing parts in the consumable melting structure shown in.

[0035] Figure 13 yes Figure 1 Schematic diagram of the fused structure of the consumables used in a 3D printer;

[0036] Figure 14 yes Figure 5 Schematic diagram of the fused structure of the filament being used in a 3D printer;

[0037] Figure 15 yes Figure 10 Schematic diagram of the fused structure of the filament being used in a 3D printer;

[0038] Numbers in the figure:

[0039] 1. Main body; 11. Accommodating cavity; 12. Second channel; 13. First connecting hole; 14. Second connecting hole; 2. Heat conducting member; 21. First channel; 211. First channel wall; 212. Second channel wall; 3. Biasing member; 4. Throat; 41. First connecting member; 42. Second connecting member; 5. Nozzle; 6. Consumables; 61. Stripped consumables. DETAILED DESCRIPTION

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0042] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] See Figures 1-15 As shown, an embodiment of the present invention provides a consumable material melting device for a 3D printer, comprising a main body 1 and at least one biasing member 3, one end of the main body 1 being used to connect to a throat 4, and the other end being used to connect to a nozzle 5, a first channel 21 being provided in the main body 1, and the first channel 21 being used to guide the flow of consumable material 6 (the consumable material 6 refers to 3D printing raw materials); the biasing member 3 is obliquely arranged in the first channel 21, one end of the biasing member 3 is fixed to the inner wall of the first channel 21, and the other end of the biasing member 3 extends toward the center of the first channel 21 and forms a gap with the inner wall of the first channel 21, the gap ensuring the circulation of the consumable material 6 in the first channel, and preventing the biasing member 3 from blocking the first channel 21 and affecting the flow of the consumable material 6.

[0044] The first channel 21 has an inlet and an outlet, respectively. The inlet communicates with the throat 4, and the outlet communicates with the nozzle 5, forming a consumable flow path. Under the action of an external force, the consumable 6 enters the first channel 21 through the throat 4. The consumable 6 is heated and melted within the first channel 21. The melted consumable is then guided through the first channel 21 to flow into the nozzle 5, where it is extruded for printing.

[0045] After the consumable 6 enters the first channel 21 under the action of external force, it contacts the biasing member 3. On the one hand, under the blocking action of the biasing member 3, the consumable advancement path is deflected, and the consumable 6 bends and is close to the biasing member 3 and the inner wall of the first channel, accelerating the softening of the consumable 6 by heat. On the other hand, the consumable 6 passes through the gap formed between the biasing member 3 and the inner wall of the first channel 21. Under the scraping action of the end of the biasing member, the softened consumable on the outside of the consumable 6 is peeled off, so that the softened part on the outside of the consumable is separated from the consumable core. After the softened part is peeled off, the hard consumable will directly contact the biasing member 3 and absorb heat at a close distance, making the consumable core closer to the heat source, thereby accelerating the heat melting of the consumable core. Therefore, the present application can effectively peel off the softened consumable by arranging the biasing member 3 in the first channel 21, and at the same time make the consumable 6 after peeling bend closer to the biasing member 3 and the inner wall of the first channel, reducing the heat conduction distance between the consumable core and the heat source, and improving the melting efficiency of the consumable core.

[0046] In some embodiments, the consumable melting device further includes a heat conducting member 2, through which the biasing member 3 is fixed to the inner wall of the first channel 21. The heat conducting member 2 is inserted into the body 1 in close contact with the inner wall of the first channel 21, and the biasing member 3 is integrally provided on the heat conducting member 2. The heat conducting member 2 provides support and heat transfer for the biasing member 3.

[0047] It should be noted that the main body 1, the heat conductor 2 and the biasing member 3 are all made of a high thermal conductivity material, for example, metal materials such as copper or aluminum, or other high thermal conductivity alloys. A heating source device can be connected to the outside of the main body 1, and the main body 1 is heated by the external heating source device. The main body 1 transfers heat to the heat conductor 2 and the biasing member 3, and the consumables 6 in the first channel 21 are heated and melted by the heat conductor 2 and the biasing member 3. Among them, the external heating source device is a prior art. For example, the heating source device can be a ceramic heating ring, an electric heating wire, etc. arranged on the outside of the main body 1, and the present invention will not elaborate on it in detail.

[0048] See Figure 1-Figure 2 、 Figure 5-Figure 6 、 Figure 10-11 As shown, in some embodiments, the body 1 is cylindrical. The inlet end of the body 1 is detachably connected to the throat 4. Specifically, the inlet end of the body 1 defines a first connecting hole 13, and the throat 4 is at least partially assembled within the first connecting hole 13. The outlet end of the body 1 is detachably connected to the nozzle 5. Specifically, the outlet end of the body 1 defines a second connecting hole 14, and the nozzle 5 is at least partially assembled within the second connecting hole 14. The first connecting hole 13 and the second connecting hole 14 can both be internally threaded holes. The first connecting hole 13 and the second connecting hole 14 are both coaxially arranged with the body 1.

[0049] In some embodiments, the body 1 has a receiving cavity 11 with openings at both ends, and the heat conductor 2 is inserted into the receiving cavity 11, and the body 1 provides support and heat transfer for the heat conductor 2. The cross-sectional profile of the heat conductor 2 matches the inner shape of the receiving cavity 11. The cross-sectional profile of the heat conductor 2 is circular, square, or polygonal. In some embodiments, the cross-sectional profile of the heat conductor 2 is a quadrilateral, and the offset member 3 is a quadrilateral plate. Optionally, the cross-sectional profile of the heat conductor 2 is square, see Figures 1-4 As shown, in some embodiments, the heat conducting member 2 is a square tube, and the inner walls of the two oppositely disposed tubes are respectively a first channel wall 211 and a second channel wall 212. The heat conducting member 2 is coaxially arranged with the body 1 to improve the uniformity of heat transfer from the body 1 to the first channel 21. When the heat conducting member 2 is a square tube, the accommodating cavity 11 in the body 1 is a rectangular parallelepiped with a square cross-section. The offset member 3 is a quadrilateral plate, one end of which is connected to one of the first channel wall 211 and the second channel wall 212, and the other end forms a gap with the other of the first channel wall 211 and the second channel wall 212.

[0050] In some embodiments, the end of the biasing member 3 extending toward the center of the first channel has a sharp edge to be able to peel off at least a portion of the softened outer periphery of the consumable. Figure 4 The biasing member 3 is tilted (in the direction indicated by the arrow in the middle). During the flow of the consumable 6, the biasing member 3 can not only play a blocking role, driving the consumable 6 to bend and fit with the biasing member 3 and the first channel wall 211 or the second channel wall 212 opposite to the biasing member 3, so that the consumable 6 is closer to the heat source; the biasing member 3 can also play a guiding role, changing the flow direction of the consumable. After the consumable 6 contacts the biasing member 3, the consumable 6 flows along the biasing member 3, making the consumable 6 and the biasing member 3 more susceptible to heat and ensuring the smooth flow of the consumable 6 in the first channel 21; the biasing member 3 can also play the role of a scraper. After the outer side of the consumable 6 is softened by heat, when the consumable 6 passes through the gap between the biasing member 3 and the opposite first channel wall 211 or the second channel wall 212, the sharp edge of the end of the biasing member 3 can peel off the softened consumable. Taking the biasing member 3 connected to the first channel wall 211 as an example, one end of the biasing member 3 is connected to the first channel wall 211, and the other end of the biasing member 3 is opposite to and spaced from the second channel wall 212, so that the biasing member 3 and the second channel wall 212 are roughly in a V-shaped structure with an open bottom. The consumable 6 flows along the biasing member 3 in the V-shaped structure toward the bottom of the V-shaped structure, so that the outer side of the consumable 6 is softened by the heat transfer of the biasing member 3. When flowing through the bottom of the V-shaped structure, the end of the biasing member 3 peels off the softened part of the outer side of the consumable, so that the distance between the core of the consumable and the channel wall or baffle 3 is reduced, making it easier to melt due to heat.

[0051] In some embodiments, the biasing member 3 is elastic. When the consumable 6 flows onto the biasing member 3, the consumable 6 is subjected to the thrust of the extrusion device, pushing the biasing member 3 and causing it to deform, thereby preventing the consumable 6 from encountering excessive resistance in the direction of movement and ensuring smooth flow of the consumable 6. In addition, when the end of the biasing member 3 is peeling off the softened portion of the consumable, the gap between the end of the biasing member 3 and the first channel will adaptively change with the size of the residual hard core of the squeezed consumable. The elastic effect of the biasing member 3 allows its end edge to always be close to the residual hard portion of the consumable, peeling off all the softened outer ring consumable it contacts from the hard core portion that has not yet softened.

[0052] See Figure 3 and Figure 12 As shown, in some embodiments, the biasing member 3 and the heat conducting member 2 are integrally formed. Part of the side wall of the heat conducting member 2 is bent toward the inside of the first channel 21 to form the biasing member 3, which facilitates the production and molding of the biasing member 3 and makes the biasing member 3 have a certain elasticity, and can be close to or away from the inner wall of the first channel 21. The heat conducting member 2 is a square tube, and laser cutting is performed from top to bottom on the two opposite side walls of the square tube to form an inverted gate-shaped sheet that is half connected to the side wall. The sheet is pushed into the first channel 21 and shaped to form the biasing member 3. The biasing member 3 is rectangular. In other embodiments, the biasing member 3 and the heat conducting member 2 can be two independent components, and the biasing member 3 is fixedly connected to the inner wall of the first channel 21.

[0053] See Figures 1-4 As shown, in some embodiments, at least two biasing members 3 are provided, and at least two biasing members 3 are staggered in the first channel 21 along a direction parallel to the central axis of the first channel 21, and the width of each gap decreases successively along the flow direction of the consumables in the first channel. Two adjacent biasing members 3 are arranged at intervals to avoid the alternating baffles 3 from blocking the first channel 21, thereby ensuring the smooth flow of the first channel 21. For example, some biasing members 3 are connected to the first channel wall 211, and another part of the biasing members 3 is connected to the second channel wall 212. When the consumable 6 flows in the first channel 21, the flow direction of the consumable 6 in the first channel 21 is changed by a plurality of biasing members 3. Along the direction parallel to the central axis of the first channel 21, the consumable 6 contacts each biasing member 3 in turn during the flow process, and each biasing member 3 heats and melts the outer side of the consumable and peels off the softened part in turn. Therefore, by using multiple biasing members 3 to gradually heat and peel the consumable 6, the softened consumable is promptly peeled off, exposing the hard portion of the consumable and allowing it to adhere to the biasing members 3 or the channel wall for heating. This increases the overall heating area of the consumable and improves the melting efficiency of the consumable. As a result, by the time the consumable 6 flows out of the first channel 21, the core of the consumable 6 has been heated to a molten state, facilitating the extrusion and ejection of the molten consumable by the nozzle 5. It should be noted that the specific number of biasing members 3 is determined by the diameter of the consumable. In other embodiments, only one biasing member 3 may be provided.

[0054] See Figure 1 As shown, in some embodiments, the orthographic projections of the biasing member 3 located on the first channel wall 211 and the biasing member 3 located on the second channel wall 212 on the radial cross section of the first channel 21 partially overlap. This arrangement can prevent the formation of a flow channel between the biasing members 3 located on different channel walls, which could cause the consumable 6 to flow toward the outlet of the first flow channel 21 without being heated or peeled off by the biasing member 3, resulting in incomplete melting of the consumable 6.

[0055] The cross-section of the heat conductor is a quadrilateral. When the biasing member 3 is a quadrilateral plate, the gap formed between the biasing member 3 and the inner wall of the first channel 21 includes a first gap, and the first gap is formed between the end edge of the biasing member 3 and the inner wall of the first channel 21. The width of the first gap is 0.1mm to 1.7mm, preferably 0.2mm to 1.2mm. Along the flow direction of the consumables 6 in the first channel 21, the first gaps formed at the ends of each biasing member 3 decrease successively, and are all smaller than the diameter of the consumables 6, so that the biasing member 3 can peel off the softened consumables. Moreover, when the consumables flow through the first gap, the biasing member 3 and the corresponding inner wall of the first channel 21 can form an extrusion effect on the consumables 6, flattening the consumables 6, thereby optimizing the consumable peeling and heating effects. By setting the size of the first gap formed by each biasing member 3, the sharp edge of each biasing member 3 can peel off the consumable 6 step by step, avoiding that when the consumable 6 flows close to the outlet of the first channel 21, the biasing member 3 near the outlet of the first channel 21 cannot peel off the consumable 6. If the first gap formed by the biasing member 3 is too large, the biasing member 3 will not be able to effectively peel off the consumable 6 whose outer layer has been softened, nor can it ensure that the core of the consumable is as close to the wall as possible, resulting in low melting efficiency; if the size of the first gap is too small, the hard core needs to stagnate and melt before passing through, resulting in the lower-level biasing member 3 being unable to play an effective role, and the overall melting efficiency is low. Figure 7 As shown, along the flow direction of the consumable material 6 in the first channel 21 ( Figure 7 (Indicated in the direction from top to bottom), four biasing members 3 are provided, and the spacing between each biasing member 3 and the corresponding first channel wall 211 or second channel wall 212 is L1, L2, L3, L4, respectively, then L1>L2>L3>L4. The diameter of the consumable 6 is 1.75mm, which is the diameter of the consumable 6 before melting. L1=1.2mm, L2=0.9mm, L3=0.8mm, L4=0.7mm. It should be pointed out that L1, L2, L3, L4 can fluctuate by 0.1mm. Taking L1 as an example, L1 can be any value between 1.1mm and 1.3mm.

[0056] See Figure 9As shown, in some embodiments, the gap formed between the offset member 3 and the inner wall of the first channel 21 also includes a second gap. The second gap is formed between the side edge of the offset member 3 and the inner wall of the first channel 21, allowing the stripped consumable 61 to flow through the second gap and be heated to meet the temperature required for extrusion. The width of the second gap formed by the side wall of the offset member 3 is L. In some embodiments, 0.1mm≤L≤0.8mm. Preferably, 0.3mm. If L is too small, the flow rate of consumable passing through will be too low.

[0057] See Figure 7 As shown, in some embodiments, the angle α between the biasing member 3 and the inner wall of the first channel 21 satisfies the following conditions: 30°≤α≤90°, preferably 45°ˉ60°. If α is too small, the stripping efficiency of the consumable 6 is low, the heat conduction distance at the center of the consumable is increased, and the contact area between the end face of the biasing member 3 and the consumable is small. To achieve the same effect, a longer first channel 21 is required, resulting in low melting efficiency. If α is too large, the consumable cannot be effectively guided to bend into the V-shaped structure formed by the biasing member 3 and the opposing first channel wall 211 or second channel wall 212, resulting in high extrusion resistance and low melting efficiency.

[0058] See Figure 5-Figure 12 As shown, in some embodiments, the body 1 further includes a second channel 12, which is located at the inlet end of the first channel 21 and is interconnected with the first channel 21. After the consumable 6 enters the body 1 through the throat 4, it enters the second channel 12 in advance. Heat is transferred from the body 1 to the consumable 6 in the second channel 12, causing the outer side of the consumable 6 to be heated and softened in the second channel 12. This serves as preheating of the consumable 6, making it easier to soften and peel the consumable 6 in the first channel 21.

[0059] In some embodiments, the cross-sectional area of the second channel 12 is less than or equal to the cross-sectional area of the first channel 21. The cross-sectional area of the second channel 12 is a closed figure surrounded by multiple arcuate edges, for example, a clover-leaf shape. This arrangement can increase the contact area between the inner wall of the second channel 12 and the consumable, thereby improving the melting efficiency of the consumable. In some embodiments, the second channel 12 includes an inner channel and three outer channels surrounding the inner channel. The inner and outer channels are arranged to overlap, resulting in a closed cross-sectional area of the second channel, thereby improving the heating efficiency of the consumable.

[0060] When the second channel 12 is provided in the body 1, the number of biasing members in the first channel 21 can be set according to the length of the second channel 12. For example, when the second channel 12 is long and the consumables 6 are sufficiently preheated in the second channel 12, the number of biasing members in the first channel 21 can be set to be smaller. For example, only one biasing member 3 can be provided in the first channel 21. Figure 10-12When the length of the second channel 12 is short, the consumables 6 are not preheated enough in the second channel 12, and the number of biasing members 3 in the first channel 21 can be set more, for example, a plurality of biasing members 3 are alternately set on the first channel wall 211 and the second channel wall 212 of the first channel 21, see Figure 5-Figure 8 .

[0061] The working process of this utility model is:

[0062] The bar material consumables enter the body 1 through the throat 4 under the action of external force. Figure 4 and Figure 8 As shown, the consumable 6 contacts the biasing member 3 in the first channel 21, and one side of the consumable 6 is partially softened by the heating of the biasing member 3, and the other side is partially softened by the heating of the inner wall of the first channel 21. The consumable 6 continues to move and contacts the biasing member 3. Under the blocking action of the biasing member 3, the consumable advancement path deviates and comes close to the biasing member and the inner wall of the channel. The biasing member 3 and the channel wall squeeze the consumable 6, and a gap is formed between the consumable passing through the biasing member 3 and the inner wall of the first channel 21. Under the scraping action of the end of the biasing member 3, the softened outer layer of the consumable 6 is peeled off, and at the same time, the peeled consumable 6 (hard consumable) directly contacts the biasing member 3 and the inner wall of the channel, absorbing heat to accelerate melting. The hard consumable will also force the biasing member 3 to deform, and the deformed biasing member 3 will adhere to the surface of the hard consumable, achieving a better peeling effect. The stripped consumable 61 not only continues to move with the hard consumable, but also passes through the second gap formed by the side wall of the biasing member 3, making full contact with the hot inner wall of the channel, improving melting efficiency. The completely melted consumable is extruded through the nozzle 5, completing the printing.

[0063] When the body 1 is provided with a second channel 12, the consumable 6 is preheated in the second channel 12 before entering the first channel 21. The consumable 6 is preheated in the second channel 12, causing the outer ring of the consumable to be initially softened. After the consumable enters the first channel 21, the consumable is partially softened, which reduces the resistance of the consumable to passing through the biasing member 3, making it easier for the biasing member 3 to peel off the softened portion of the consumable.

[0064] See Figure 13-15 As shown, the present application also provides a 3D printer, comprising the consumable melting device for the 3D printer, a throat 4 and a nozzle 5 as described above, the throat 4 being connected to the inlet end of the main body 1 in the consumable melting device and being communicated with the first channel 21; the nozzle 5 being connected to the outlet end of the main body 1 in the consumable melting device and being communicated with the first channel 21.

[0065] The consumable material 6 is driven into the throat 4 by external force, and then enters the main body 1 through the throat 4 to be heated and melted. The consumable material 6 is heated and melted during the flow in the main body 1. The melted consumable material 6 enters the nozzle 5 and is ejected through the nozzle 5 to be printed and formed.

[0066] See Figure 13-15 As shown, in some embodiments, the 3D printer further includes a first connecting member 41 and a second connecting member 42, wherein the first connecting member 41 is connected to the upper portion of the throat 4, and the second connecting member 42 is connected to the lower portion of the throat 4. The first connecting member 41 and the second connecting member 42 are respectively threadedly connected to the throat 4 for easy assembly. The first connecting member 41 is used to connect to the upper structure (such as the effector housing or the effector heat dissipation mechanism), and the second connecting member 42 is connected to the body 1, thereby fixing the throat 4 to the body 1. The second connecting member 42 is detachably connected to the body 1. The second connecting member 42 is threadedly assembled in the first connecting hole 13 of the body 1. The nozzle 5 is threadedly assembled in the second connecting hole 14 of the body 1.

[0067] It should be noted that a heating source device is provided on the outside of the body 1. The body 1 is heated by the external heating source device, and the body 1 transfers heat to the heat conducting member 2 and the biasing member 3. The heat conducting member 2 and the biasing member 3 heat and melt the consumables 6 in the first channel 21. Among them, the external heating source device is a prior art. For example, the heating source device can be a ceramic heating ring, an electric heating wire, etc. provided on the outside of the body 1. The present invention does not elaborate on this in detail.

[0068] It should be noted that the 3D printer in the present invention also includes other components to cooperate with the consumable material melting device, throat 4, and nozzle 5 to realize the 3D printing function of the 3D printer. The other components and working principles of the 3D printer are all prior art and will not be described in detail in the present invention.

[0069] In summary, the present application provides a consumable melting device for a 3D printer and a 3D printer. By arranging a biasing member 3 in the first channel 21, the consumable 6 contacts the biasing member 3 after entering the first channel 21 under the action of an external force. On the one hand, under the blocking action of the biasing member 3, the consumable advancement path is deflected, and it is close to the biasing member 3 and the inner wall of the channel, thereby accelerating the softening of the consumable due to heat. On the other hand, the consumable 6 passes through the gap formed between the biasing member 3 and the inner wall of the first channel 21, and under the scraping action of the end of the biasing member 3, the softened part on the outside of the consumable is peeled off, so that the softened part on the outside of the consumable is separated from the core of the consumable. After the softened part is peeled off, the hard consumable will directly contact the biasing member, absorb heat at a close distance, and make the core of the consumable closer to the heat source, thereby accelerating the heating and melting of the core of the consumable. Therefore, the present application can effectively peel off the softened portion on the outside of the consumable by setting a biasing member in the first channel, and at the same time make the consumable bend closer to the biasing member and the inner wall of the first channel after peeling, reduce the distance between the core of the consumable and the heat source, and improve the melting efficiency of the core of the consumable. In addition, by setting at least two biasing members 3 and setting the gap size between each biasing member 3 and the inner wall of the channel, each biasing member 3 forms a step-by-step peeling effect on the consumable, ensuring that the biasing member 3 effectively peels off the softened consumable. By setting a second channel 12 at the inlet end of the first channel 21, the consumable 6 can also be preheated, facilitating the softening and peeling of the consumable 6 in the first channel 21, and improving the heating efficiency of the consumable.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A consumable material melting device for a 3D printer, comprising a body having a first channel therein, characterized in that: It also includes at least one biasing member, which is tilted and arranged in the first channel. One end of the biasing member is fixed to the inner wall of the first channel, and the other end of the biasing member extends toward the center of the first channel and forms a gap with the inner wall of the first channel.

2. The consumable material melting device for a 3D printer according to claim 1, characterized in that: One end of the biasing member extending toward the center of the first channel has a sharp edge.

3. The consumable material melting device for a 3D printer according to claim 1, characterized in that: The biasing member is elastic.

4. The consumable material melting device for a 3D printer according to claim 1, characterized in that: An included angle α between the biasing member and the inner wall of the first channel satisfies: 30°≤α≤90°.

5. The consumable material melting device for a 3D printer according to claim 1, characterized in that: The biasing member is fixed to the inner wall of the first channel through a heat conducting member. The heat conducting member is inserted into the body in close contact with the inner wall of the first channel. The biasing member is integrally arranged on the heat conducting member.

6. The consumable material melting device for a 3D printer according to claim 5, characterized in that: The cross section of the heat conducting member is circular, square or polygonal.

7. The consumable material melting device for a 3D printer according to claim 5, characterized in that: The cross section of the heat conducting member is a quadrilateral; and the biasing member is a quadrilateral plate.

8. The consumable material melting device for a 3D printer according to claim 7, characterized in that: The gap includes a first gap and a second gap; the first gap is formed between the end edge of the quadrilateral plate and the inner wall of the first channel; the second gap is formed between the side edge of the quadrilateral plate and the inner wall of the first channel.

9. The consumable material melting device for a 3D printer according to claim 8, characterized in that: The first gap width is 0.1 mm to 1.7 mm; the second gap width is 0.1 mm to 0.8 mm.

10. The consumable material melting device for a 3D printer according to any one of claims 1 to 9, characterized in that: There are at least two biasing members, and the at least two biasing members are staggered in the first channel, and the width of each gap decreases successively along the flow direction of the consumables in the first channel.

11. The consumable material melting device for a 3D printer according to any one of claims 1 to 9, characterized in that: The body also includes a second channel connected to the first channel, the second channel is arranged at the inlet end of the first channel, the cross-sectional area of the second channel is less than or equal to the cross-sectional area of the first channel, and the cross-sectional area of the second channel is a closed figure surrounded by multiple arc edges.

12. A 3D printer, characterized in that: include: The consumable material melting device for a 3D printer according to any one of claims 1 to 11; a throat connected to the inlet end of the body of the consumable melting device and in communication with the first channel; and The nozzle is connected to the outlet end of the body in the consumable melting device and is communicated with the first channel.

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