Fusion device for 3D printing and 3D printing equipment

Abstract

The utility model provides a melting device for 3D printing and 3D printing equipment, and the melting device comprises a heating piece and a nozzle, a first channel is formed in the heating part in the axial direction of the heating part, the heating part is provided with a first end and a second end, the inner diameter of the first channel is gradually reduced from the first end to the second end, the conical part is arranged in the first channel in a penetrating mode and used for stripping the outer layer of a softened wire, and the heating part is used for heating the wire; and the nozzle is arranged at the second end part, is communicated with the first channel and is used for discharging the molten wire. According to the melting device provided by the embodiment, as the inner diameter of the first channel is gradually reduced from the first end part to the second end part, when the wire is conveyed through the first channel, the conical part can strip the softened outer layer of the wire, and at the moment, the heating part can directly and rapidly heat the inner core of the wire; and therefore, the melting reliability of the wire rod in the conveying process is guaranteed, the situation that the nozzle is blocked is avoided, and the 3D printing efficiency is improved.

Description

Technical Field

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

[0002] 3D printing technology, also known as Additive Manufacturing Technologies (AM), is a technology for manufacturing solid parts by the method of layer-by-layer material accumulation based on three-dimensional CAD data.

[0003] There are many types of existing 3D printing machines. Generally, during 3D printing, the wire in the printer is usually melted and extruded through a heated nozzle. The nozzle will place the melted wire on the building platform according to the process path obtained by the system software to print the required product structure.

[0004] In the prior art, the inner core of the wire is relatively far from the heat source in the nozzle, resulting in a relatively long time required for the wire to be completely melted. During rapid printing, the inner core of the wire cannot be melted, resulting in nozzle clogging, which affects the printing efficiency. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a melting device for 3D printing and a 3D printing device, which can effectively melt the wire, avoid nozzle clogging, and improve the 3D printing efficiency.

[0006] To achieve the above purpose, in the first aspect, the utility model provides a melting device for 3D printing, including a heating element and a nozzle;

[0007] The heating element is axially provided with a first channel. The heating element has a first end and a second end. The inner diameter of the first channel gradually decreases from the first end to the second end. The first channel is used for conveying the wire, and the heating element is used for heating the wire;

[0008] A conical member is disposed in the first channel for peeling the softened outer layer of the wire;

[0009] The nozzle is disposed at the second end, and the nozzle is communicated with the first channel for discharging the melted wire.

[0010] The beneficial effects of the melting device for 3D printing provided by the present utility model are as follows: The heating element is axially provided with a first channel for conveying the wire. The heating element heats the wire to melt it. During the heating process, the outer layer of the wire will soften first. Since the inner diameter of the first channel gradually decreases from the first end to the second end, and a conical part is inserted into the first channel to strip the softened outer layer of the wire. Therefore, when the wire is conveyed through the first channel, the conical part will strip the softened outer layer of the wire, so that the inner core of the wire is exposed. At this time, the heating element can directly and quickly heat the inner core of the wire, thereby ensuring the reliability of the wire melting during the conveying process, avoiding the occurrence of nozzle clogging, and improving the efficiency of 3D printing.

[0011] In some embodiments, the melting device for 3D printing further includes a conical part, and the conical part is axially provided with a spiral channel;

[0012] The conical part is inserted into the first channel, and the spiral channel is communicated with the nozzle. The beneficial effects are as follows: By arranging a conical part in the first channel, and since the conical part has a threaded channel, the stripping effect of the outer layer of the wire is further ensured, thereby improving the reliability of the wire melting.

[0013] In some embodiments, the conical part has elasticity. The beneficial effects are as follows: When the wire passes through the upper end of the conical part, the heating element will soften the outer layer of the wire. When the wire contacts the conical part, the conical part will strip the softened outer layer of the wire. During the movement of the wire, it will press down on the conical part, thereby increasing the contact area with the conical part. Since the conical part conducts heat in the first channel, the larger the contact area between the conical part and the wire, the faster the wire is softened. When the wire is softened, the interaction force between it and the conical part decreases, and the conical part will rebound, preparing for the wire to continue pressing down on the conical part to further strip the wire until the wire is completely softened.

[0014] In some embodiments, the heating element is provided with a bottom mounting groove at the second end, and a flow channel is provided in the bottom mounting groove. The flow channel communicates the first channel with the bottom mounting groove;

[0015] One end of the nozzle is arranged in the bottom mounting groove and is communicated with the first channel through the flow channel. The beneficial effects are as follows: By providing a bottom mounting groove at the second end, it is convenient to connect with the nozzle and ensures the reliability of the connection between the nozzle and the heating element.

[0016] In some embodiments, the flow channel has a first port and a second port. The inner diameter of the first port is larger than that of the second port, and the first port is close to the first channel;

[0017] One end of the first channel near the first port has an inner diameter smaller than that of the first port. The beneficial effect is that by setting the inner diameter of the first port of the flow channel to be larger than that of the second port, it is convenient for the discharged softened wire.

[0018] In some embodiments, the melting device for 3D printing further includes a connecting member;

[0019] The heating element is provided with a top mounting groove communicating with the first channel at the first end;

[0020] The connecting member is arranged in the top mounting groove, and the connecting member is provided with a second channel corresponding to the first channel, and the second channel communicates with the first channel. The beneficial effect is that a top mounting groove communicating with the first channel is provided at the first end, which is convenient for the installation of the connecting member, and the heating element can quickly and efficiently transfer heat to the connecting member, so that the connecting member softens the outer layer of the wire.

[0021] In some embodiments, the melting device for 3D printing further includes a throat tube and a heat dissipating member;

[0022] The heat dissipating member is provided with a mounting hole;

[0023] One end of the throat tube is inserted into the mounting hole, and the other end is inserted into the second channel. The throat tube is provided with a through hole along its axial direction, and the through hole is used to communicate the connecting member and the heat dissipating member. The beneficial effect is that the heat dissipating member and the connecting member are connected through the throat tube to reduce heat transfer and avoid the influence of heat on equipment outside the melting device.

[0024] In some embodiments, a plurality of reinforcing ribs are further arranged in the first channel;

[0025] The reinforcing ribs extend along the axial direction of the first channel, and a plurality of the reinforcing ribs are annularly and spacedly arranged on the inner wall of the first channel. The beneficial effect is that by arranging the reinforcing ribs in the first channel, the structure in the first channel is strengthened, and the heat conduction effect on the softened wire is enhanced.

[0026] In some embodiments, the conical member is a conical spring;

[0027] A plurality of the reinforcing ribs enclose an installation channel in the first channel;

[0028] The conical spring is arranged in the installation channel. The beneficial effect is that by setting the conical member as a conical spring, the softening effect on the wire is ensured.

[0029] In a second aspect, an embodiment of the present invention provides a 3D printing device, including a printing chamber and the melting device;

[0030] The melting device is arranged in the printing chamber and is used to print products in the printing chamber.

[0031] The beneficial effects of the 3D printing device provided by the present utility model are as follows: Since the heating element in the melting device is axially provided with a first channel, and a conical part is arranged in the first channel, when the heating element heats the wire, the conical part will strip the softened part of the outer layer of the wire, so that the inner core of the wire is exposed. At this time, the heating element can directly and quickly heat the inner core of the wire, thereby ensuring the reliability of the melting of the wire during transportation, avoiding the occurrence of nozzle clogging, and improving the efficiency of 3D printing. Description of the Drawings

[0032] Figure 1 It is the front view of the melting device for 3D printing according to the embodiment provided by the present utility model;

[0033] Figure 2 is Figure 1 the cross-sectional view along A-A in

[0034] Figure 3 It is the cross-sectional view of the heating element along its axis according to the embodiment provided by the present utility model;

[0035] Figure 4 It is the top view of the heating element according to the embodiment provided by the present utility model;

[0036] Figure 5 It is the front view of the conical part and the cross-sectional view along B-B according to the first embodiment provided by the present utility model;

[0037] Figure 6 It is the front view of the conical part and the cross-sectional view along C-C according to the second embodiment provided by the present utility model.

[0038] Reference Numerals in the Drawings:

[0039] 1. Heating element; 11. First channel; 12. Bottom mounting groove; 13. Flow channel; 14. Top mounting groove; 15. Reinforcing rib; 2. Nozzle; 3. Conical part; 4. Connecting part; 41. Second channel; 5. Throat tube; 51. Through hole; 6. Heat dissipation part. Detailed Embodiment

[0040] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the field to which the present utility model belongs. The words such as "including" used herein mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The "connection" described herein may be a direct connection or an indirect connection, that is, a connection through an intermediate object, unless otherwise specified.

[0041] In view of the problems existing in the prior art, an embodiment of the present utility model provides a melting device for 3D printing. Referring to Figures 1 to 3 as shown, the melting device includes a heating member 1 and a nozzle 2. Among them, the heating member 1 is axially provided with a first channel 11, the first channel 11 is coaxial with the heating member 1 and penetrates through the heating member 1. The heating member 1 has a first end and a second end, the first end is located above the second end, the inner diameter of the first channel 11 gradually decreases from the first end to the second end, the first channel 11 is used for conveying wire, the heating member 1 is used for heating the wire, the nozzle 2 is arranged at the second end, and the nozzle 2 is communicated with the first channel 11 for discharging the melted wire.

[0042] In this embodiment, the diameter of the wire can be slightly smaller than the inner diameter of the first channel 11 at the first end, so that the wire can be conveyed into the first channel 11. The heating member 1 is used for continuously heating the wire. During the heating process, the outer layer of the wire will be softened first. Along with the movement of the wire, the inner wall of the first channel 11 will scrape off the softened wire, so that the inner core of the wire is exposed. At this time, the heating member 1 can directly and quickly heat the inner core of the wire, thereby ensuring the reliability of the melting of the wire during the conveying process, avoiding the situation of blockage of the nozzle 2, and improving the efficiency of 3D printing.

[0043] In some specific embodiments, the outer shape of the heating member 1 is in a cylindrical structure. In some embodiments, the outer shape of the heating member 1 can also be in other shapes such as a rectangle.

[0044] In some embodiments, the melting device for 3D printing further includes a conical member 3. The conical member 3 is axially provided with a spiral channel, the conical member 3 is inserted into the first channel 11, and the spiral channel is communicated with the nozzle 2.

[0045] In this embodiment, by disposing a conical member 3 having a spiral channel in the first channel 11, the scraping effect on the outer softened wire is ensured, thereby improving the reliability of wire melting.

[0046] It should be noted that in some embodiments, spiral grooves may be directly provided on the inner wall of the first channel 11 to form the first channel 11 into the spiral channel, so as to improve the scraping effect on the softened wire.

[0047] In some embodiments, the conical member 3 is elastic so that the conical member 3 can be telescopic. And the conical member 3 can be made of a material with relatively high thermal conductivity, such as copper.

[0048] In this embodiment, when the wire passes through the upper end of the conical member 3, the heating member 1 first softens the outer layer of the wire. When the wire contacts the conical member 3, the conical member 3 strips the softened outer layer wire. And during the process of wire conveying and moving, the wire abuts against the conical member 3 to press down the conical member 3, and when pressing down, the contact area with the conical member 3 will increase. Since the conical member 3 conducts heat in the first channel 11, the larger the contact area between the conical member 3 and the wire, the faster the wire is softened. When the wire is softened, the interaction force between it and the conical member 3 decreases, and the conical member 3 rebounds, preparing for the wire to continue pressing down the conical member 3 and further stripping the wire until the wire is completely softened.

[0049] In some embodiments, referring to Figure 3 and Figure 4 as shown, a plurality of reinforcing ribs 15 are further provided in the first channel 11. The reinforcing ribs 15 extend along the axial direction of the first channel 11, and the plurality of reinforcing ribs 15 are annularly and spacedly arranged on the inner wall of the first channel 11.

[0050] In this embodiment, the material of the reinforcing rib 15 can also be made of copper material to ensure the heat conduction effect of the reinforcing rib 15. And by disposing the reinforcing rib 15 in the first channel 11, it not only plays a role in strengthening the structural strength in the first channel 11, but more importantly, when the conical member 3 is disposed in the first channel 11, due to the reinforcing rib 15, there is a gap between the conical member 3 and the inner side wall of the first channel 11, so that the softened wire can be located in this gap after being scraped and flow through this gap. And the reinforcing rib 15 and the inner wall of the first channel 11 contact the softened wire to ensure the continuous heating effect on the softened wire.

[0051] In some specific embodiments, several of the reinforcing ribs 15 are arranged at intervals in a ring on the inner wall of the first channel 11, and an installation channel for installing the conical member 3 is formed by surrounding within the first channel 11. The longitudinal section of the installation channel is an inverted cone. The conical member 3 is a conical spring, and the conical spring is adapted to the installation channel. When the conical spring is embedded in the installation channel, the outer wall of the conical spring is clamped with several of the reinforcing ribs 15.

[0052] Refer to Figure 5 As shown, in this embodiment, the conical spring is formed by helically winding a cylindrical connecting member 4. By forming the conical spring by helically winding a cylindrical connecting member 4, when the wire contacts the conical spring, the transition is smoother, and the melting speed of the wire is increased.

[0053] Refer to Figure 6 As shown, in some embodiments, the conical spring can also be formed by helically winding a diamond-shaped connecting member 4. By forming the conical spring by helically winding a diamond-shaped connecting member 4, when the wire contacts the conical spring, the peeling speed of the softened wire is accelerated, thereby increasing the melting speed of the wire.

[0054] It can be understood that the conical member 3 is formed of a metal material, such as iron or copper, etc., to ensure the heat conduction performance of the conical member 3.

[0055] In some embodiments, the conical member 3 can also be electrified so that the conical member 3 forms a heat conduction resistance, thereby realizing that the heating member 1 and the conical member 3 heat the wire at the same time, to further improve the reliability of melting the wire and improve the efficiency of 3D printing.

[0056] Refer to Figures 1 to 3 As shown, in some embodiments, the heating member 1 is provided with a bottom installation groove 12 at the second end portion. A flow channel 13 is provided in the bottom installation groove 12. The flow channel 13 communicates the first channel 11 with the bottom installation groove 12. One end of the nozzle 2 is arranged in the bottom installation groove 12 and communicates with the first channel 11 through the flow channel 13.

[0057] In this embodiment, the bottom installation groove 12 and the nozzle 2 are detachably connected. By setting the nozzle 2 and the heating member 1 as a detachable structure, it is convenient for the processing and installation of parts and the subsequent cleaning work of the nozzle 2.

[0058] Specifically, the bottom mounting groove 12 is a circular groove, the flow channel 13 is arranged at the bottom of the circular groove and communicated with the first channel 11, and the inner side wall of the bottom mounting groove 12 is provided with an internal thread structure. One end of the nozzle 2 is a cylindrical structure adapted to the circular groove, and an external thread structure matching the internal thread structure is arranged on the outer side wall of one end of the nozzle 2. By contacting one end of the nozzle 2 with the bottom mounting groove 12 and rotating the nozzle 2, the nozzle 2 is threadedly connected with the bottom mounting groove 12.

[0059] In some embodiments, the bottom mounting groove 12 and the nozzle 2 can also be connected in a snap-fit manner. For example, a snap-fit groove is arranged on the inner side wall of the bottom mounting groove 12, and a snap-fit protrusion is arranged on the outer side wall of the nozzle 2. When the nozzle 2 is inserted into the bottom mounting groove 12, the snap-fit protrusion cooperates with the snap-fit groove, thereby realizing the installation and fixation of the nozzle 2.

[0060] Further, the flow channel 13 has a first port and a second port. The inner diameter of the first port is larger than that of the second port, and the first port is close to the first channel 11. The inner diameter of one end of the first channel 11 close to the first port is smaller than that of the first port.

[0061] In this embodiment, the flow channel 13 is in a frustum shape. By setting the inner diameter of the first port to be larger than that of the second port and larger than the inner diameter of one end of the first channel 11 close to the first port, it is convenient for the discharged softened wire.

[0062] Continue to refer to Figures 1 to 3 As shown, in some embodiments, the heating element 1 is provided with a top mounting groove 14 communicated with the first channel 11 at the first end. The melting device for 3D printing further includes a connecting member 4. The connecting member 4 is arranged in the top mounting groove 14, and the connecting member 4 is provided with a second channel 41 corresponding to the first channel 11. The second channel 41 is communicated with the first channel 11.

[0063] In this embodiment, the connecting member 4 is in a cylindrical structure, and the second channel 41 is coaxially arranged with the connecting member 4. The top mounting groove 14 communicated with the first channel 11 is arranged on the first end of the heating element 1, which is convenient for the installation of the connecting member 4, and can enable the heating element 1 to transfer heat to the connecting member 4 quickly and efficiently, so that the connecting member 4 softens the outer layer of the wire.

[0064] In this embodiment, the material of the connecting member 4 can be copper or iron, preferably copper.

[0065] In some embodiments, the connecting member 4 and the heating member 1 are detachably connected. Specifically, the top mounting groove 14 is a circular groove. One end of the first channel 11 extends to the top mounting groove 14 and communicates with the top mounting groove 14. The inner side wall of the top mounting groove 14 has an internal thread structure. One end of the connecting member 4 is a cylindrical structure adapted to the circular groove, and an external thread structure matching the internal thread structure is provided on the outer side wall of one end of the connecting member 4. By bringing one end of the connecting member 4 into contact with the top mounting groove 14 and rotating the connecting member 4, the connecting member 4 is threadedly connected to the top mounting groove 14.

[0066] In some embodiments, the top mounting groove 14 and the connecting member 4 can also be connected in a snap-fit manner. For example, a snap-fit groove is provided on the inner side wall of the top mounting groove 14, and a snap-fit protrusion is provided on the outer side wall of the connecting member 4. When the connecting member 4 is inserted into the top mounting groove 14, the snap-fit protrusion cooperates with the snap-fit groove, thereby realizing the installation and fixation of the connecting member 4.

[0067] Reference Figure 1 and Figure 2 As shown, in some embodiments, the melting device for 3D printing further includes a throat tube 5 and a heat dissipation member 6. Among them, the heat dissipation member 6 is provided with a mounting hole, and one end of the throat tube 5 passes through the mounting hole and is fixedly connected to the heat dissipation member 6. The other end of the throat tube 5 passes through the second channel 41 and is fixedly connected to the connecting member 4. The throat tube 5 is provided with a through hole 51 along its axial direction, and the through hole 51 is used to conduct the heat dissipation member 6 and the connecting member 4.

[0068] In this embodiment, the connecting member 4 and the heat dissipation member 6 are connected through the throat tube 5 to reduce heat transfer and avoid the influence of heat on equipment other than the melting device. Among them, the throat tube 5 can be made of a material with poor thermal conductivity, such as ceramic material.

[0069] In some embodiments, in order to further avoid heat transfer, a cooling channel can also be provided in the heat dissipation member 6. The cooling channel is arranged around the mounting hole. Liquid inlet holes and liquid outlet holes are provided on the side wall of the heat dissipation member 6. The liquid inlet hole is communicated with the liquid inlet pipeline, and the liquid outlet hole is communicated with the liquid outlet pipeline. The coolant is transported into the cooling channel through the liquid inlet pipeline and then discharged through the liquid outlet pipeline, thereby reducing the temperature on the heat dissipation member 6.

[0070] In another embodiment provided by the present invention, a 3D printing device is provided, including a printing chamber and the melting device for 3D printing mentioned in the above embodiments. Among them, the melting device is arranged in the printing chamber and is used to print products in the printing chamber.

[0071] In this embodiment, by adopting the melting device for 3D printing provided by the present utility model, the reliability of melting during the wire feeding process of the 3D printing device is ensured, the situation of nozzle 2 being blocked with materials is avoided, and the efficiency of 3D printing is improved.

[0072] As mentioned above, it is only the specific implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A melting device for 3D printing, characterized in that: including a heating element and a nozzle; The heating element is provided with a first channel along its axial direction, the heating element has a first end and a second end, the inner diameter of the first channel gradually decreases from the first end to the second end, the first channel is used for conveying the wire, and the heating element is used for heating the wire; A cone-shaped member, inserted into the first channel, and used for stripping the softened outer layer of the wire; The nozzle is disposed at the second end portion and is communicated with the first channel for discharging the melted wire material.

2. The melting device for 3D printing according to claim 1, characterized in that: The conical member is provided with a spiral channel along its axial direction; The spiral channel is communicated with the nozzle.

3. The melting device for 3D printing according to claim 2, characterized in that: The cone-shaped member is elastic.

4. The melting device for 3D printing according to any one of claims 1 to 3, characterized in that: The heating element is provided with a bottom installation groove on the second end portion, and a flow channel is provided in the bottom installation groove, and the flow channel connects the first channel with the bottom installation groove; One end of the nozzle is disposed in the bottom mounting groove and is communicated with the first channel through the flow channel.

5. The melting device for 3D printing according to claim 4, characterized in that: The flow channel has a first port and a second port, the inner diameter of the first port is larger than the inner diameter of the second port, and the first port is close to the first channel; An end of the first channel close to the first port has an inner diameter smaller than that of the first port.

6. The melting device for 3D printing according to claim 1, characterized in that: Also includes connectors; The heating element is provided with a top mounting groove on the first end portion and communicated with the first channel; The connecting member is arranged in the top installation groove, and the connecting member has a second channel corresponding to the first channel, and the second channel is communicated with the first channel.

7. The melting device for 3D printing according to claim 6, characterized in that: It also includes throats and heat sinks; The heat sink is provided with a mounting hole; One end of the throat is inserted into the mounting hole, and the other end is inserted into the second channel. The throat is provided with a through hole along its axial direction, and the through hole is used to connect the connecting member and the heat sink.

8. The melting device for 3D printing according to claim 2 or 3, characterized in that: A number of reinforcing ribs are also provided in the first channel; The reinforcing ribs extend along the axial direction of the first channel, and a plurality of the reinforcing ribs are arranged at annular intervals on the inner wall of the first channel.

9. The melting device for 3D printing according to claim 8, characterized in that: The conical member is a conical spring; A plurality of the reinforcing ribs are arranged in the first channel to form a mounting channel; The conical spring is arranged in the installation channel.

10. A 3D printing device, characterized in that: comprising a printing chamber and a melting device according to any one of claims 1 to 9; The melting device is arranged in the printing chamber and is used for printing products in the printing chamber.

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