A 3D printing anti-deformation wire feeding device

Abstract

The present invention relates to the technical field of 3D printing, and specifically relates to a 3D printing anti-deformation wire feeding device, which includes a wire feeding unit fixedly arranged at the driving end of a sliding table group through a connecting frame; a wire outlet unit is vertically arranged directly below the wire feeding unit and coaxially arranged with the wire feeding end of the wire feeding unit; a heating unit is sleeved and installed outside the wire outlet unit and is arranged near the wire outlet of the wire outlet unit; the wire outlet unit further includes, from top to bottom in sequence, a wire inlet pipe fitting, a heating throat pipe, and a wire outlet nozzle that are screwed together; the internal transmission channels of the wire inlet pipe fitting, the heating throat pipe, and the wire outlet nozzle are coaxially arranged; a receiving cavity is opened in the heating throat pipe and a filtering element is arranged directly below the receiving cavity; the present application can not only timely stop the molten material but also effectively prevent foreign objects from entering the wire inlet conduit, making the wire outlet more smooth and unblocked during the printing process of the 3D printer.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and specifically relates to a 3D printing anti-deformation wire feeding device. Background Art

[0002] At present, there are mainly four types of 3D printing technologies: Stereolithography (SLA), Three-Dimensional Printing (3DP), Selective Laser Sintering (SLS), and Fused Deposition Modeling (FDM); among them, Fused Deposition Modeling (FDM), also known as fused deposition, melts a filamentous thermoplastic material and extrudes it through a print head with a fine nozzle. After the thermoplastic material melts, it is ejected from the print head and deposited on the print workbench panel or the previously cured material layer. After the temperature drops below the curing temperature, it starts to cure, and the final product is formed by layer-by-layer stacking of the material;

[0003] However, the existing nozzles of Fused Deposition Modeling 3D printers still have the following disadvantages: 1. During the wire feeding process of the printing wire, in order to ensure smooth wire feeding of the printing wire, the inner diameter of the wire guiding pipe fitting is generally larger than the outer diameter of the printing wire. However, during the wire feeding process of the printing wire, due to the printing environment, if the printing wire accidentally adheres to foreign objects or foreign objects accidentally enter the wire guiding pipe fitting along the printing wire from the feeding port, especially when printing small parts, if the above situation occurs, since the outlet diameter is small and the foreign objects cannot be melted by the heating element, they will block at the outlet along the pipe fitting. Even if it does not affect normal wire feeding, it will still cause the exported printing wire to bifurcate and the wire feeding to be incomplete and not full, and will significantly reduce the wire feeding speed; 2. The heating module of the existing nozzle is usually located inside the nozzle (part of the heating block is sleeved on the nozzle and integrated with the nozzle), and its heating area is large, causing a large amount of printing material inside the print head to melt. The newly entered unmelted material will squeeze out the melted material inside the print head and overflow from the gap at the feeding end and cool and solidify, resulting in blockage of the print head; especially in the case of nozzle blockage caused by foreign objects mentioned in defect 1, the backflow of the melted printing material will be more significant. Summary of the Invention

[0004] In view of the above problems, a 3D printing anti-deformation wire feeding device is provided, which solves the technical problems of excessive heating area, material overflow causing blockage, and foreign objects entering the wire guiding pipe fitting along the printing wire and causing blockage of the wire outlet in the prior art by providing a structure that can intercept and retain the overflowed material in the melting section while effectively preventing impurities from entering the wire guiding pipe fitting.

[0005] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0006] A 3D printing anti-deformation wire feeding device, comprising a wire feeding unit fixedly arranged at the driving end of a sliding table group through a connecting frame; a wire outlet unit vertically arranged directly below the wire feeding unit and coaxially arranged with the wire feeding end of the wire feeding unit; a heating unit sleeved and installed outside the wire outlet unit and arranged near the wire outlet of the wire outlet unit; the wire outlet unit further includes, from top to bottom in sequence, a wire inlet pipe fitting, a heating throat pipe, and a wire outlet nozzle, which are coaxially arranged inside the wire inlet pipe fitting, the heating throat pipe, and the wire outlet nozzle; a receiving cavity is formed inside the heating throat pipe, and a filtering element is arranged directly below the receiving cavity.

[0007] Preferably, the filtering element includes a fitting and a blocking member. The fitting is coaxially inserted into the bottom of the heating throat pipe in an embedded manner, and a through hole with the same diameter as the internal transmission channel of the heating throat pipe is coaxially penetrated through the middle of the fitting; the blocking member is horizontally arranged inside the through hole, and multiple groups of blocking members are arranged circumferentially along the axis of the through hole. A blocking net is formed by splicing between the multiple groups of blocking members, and the mesh gap of the blocking net is smaller than the wire outlet of the wire outlet nozzle.

[0008] Preferably, an annular groove in a funnel shape is coaxially formed inside the heating throat pipe and is arranged near the top of the heating throat pipe; three groups of annular grooves are equidistantly arranged along the axis of the heating throat pipe towards the bottom of the heating throat pipe, and the three groups of annular grooves form the receiving cavity.

[0009] Preferably, the heating throat pipe further includes heat dissipation fins and a heat dissipation fan; the heat dissipation fins are horizontally arranged outside the heating throat pipe, and multiple groups of heat dissipation fins are equidistantly arranged along the axis of the heating throat pipe towards the bottom of the heating throat pipe; the heat dissipation fan is detachably arranged on one side of the heat dissipation fins to assist the heat dissipation fins in dissipating heat.

[0010] Preferably, an annular rubber ring is coaxially sleeved and installed on the top of the wire inlet pipe fitting.

[0011] Preferably, the heating unit is a high-temperature heating aluminum block.

[0012] Preferably, the wire feeding unit includes a servo motor, a wire feeding wheel, a rotating shaft, a wire guiding wheel, and a connecting member;

[0013] The servo motor is horizontally arranged on the connecting frame;

[0014] The wire feeding wheel is coaxially and fixedly arranged on the driving shaft of the servo motor;

[0015] The connecting member is vertically arranged on the connecting frame and is arranged near the driving end of the servo motor. A wire inlet hole and a wire outlet hole are coaxially penetrated through the connecting frame member, and the wire feeding wheel is located on the left side of the wire inlet hole;

[0016] The wire guiding wheel is arranged on the connecting member through the rotating shaft relative to the wire feeding wheel and is located on the right side of the wire inlet hole;

[0017] A conduction gap for the printing wire to pass through is left between the wire guiding wheel and the wire feeding wheel.

[0018] The beneficial effects of the present invention compared with the prior art are as follows:

[0019] 1. By heating the annular groove provided inside the heating throat, the present invention realizes how to promptly stop the overflowing printing material when the printing material overflows, so that the overflowing printing material always remains in the heating section, and the problem of nozzle blockage of the wire feeding nozzle caused by condensation is avoided.

[0020] 2. By providing a filtering element between the heating throat and the wire feeding nozzle, the present invention realizes how to promptly block the foreign matter that cannot be melted when foreign matter appears inside the wire feeding pipe fitting, so as to avoid the problem of nozzle blockage of the wire feeding nozzle when printing relatively precise materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of a 3D printing anti-deformation wire feeding device;

[0022] Figure 2 is a perspective view of a wire supply unit in a 3D printing anti-deformation wire feeding device;

[0023] Figure 3 is a perspective view of a wire feeding unit and a heating unit in a 3D printing anti-deformation wire feeding device;

[0024] Figure 4 is a schematic diagram of a three-dimensional exploded structure of a wire feeding unit and a heating unit in a 3D printing anti-deformation wire feeding device;

[0025] Figure 5 is a side view of a wire feeding unit and a heating unit in a 3D printing anti-deformation wire feeding device;

[0026] Figure 6 is Figure 5 a cross-sectional view taken along line A-A of;

[0027] Figure 7 is a perspective view of a filtering unit in a 3D printing anti-deformation wire feeding device.

[0028] The reference numerals in the drawings are:

[0029] 1 - connecting frame;

[0030] 2 - wire supply unit; 21 - servo motor; 22 - wire feeding wheel; 23 - rotating shaft; 24 - wire guiding wheel; 25 - connecting member; 251 - wire inlet hole; 252 - wire outlet hole;

[0031] 3 - Wire Feeding Unit; 31 - Inlet Pipe Fitting; 311 - Annular Rubber Ring; 32 - Heating Throat Tube; 33 - Wire Extrusion Nozzle; 34 - Filter Element; 341 - Fitting; 3411 - Insertion Ring; 3412 - Limit Ring; 342 - Blocking Part; 35 - Heat Dissipation Fins; 36 - Heat Dissipation Fan; 37 - Annular Groove

[0032] 4 - Heating Unit; 41 - High - Temperature Heating Aluminum Block Detailed Embodiment

[0033] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Refer to Figures 1 to 7 as shown in

[0035] A 3D printing anti - deformation wire feeding device includes a wire supply unit 2 fixedly arranged at the driving end of the sliding table group through a connecting frame 1; a wire extrusion unit 3 is vertically arranged directly below the wire supply unit 2 and is coaxially arranged with the wire supply end of the wire supply unit 2; a heating unit 4 is sleeved and installed outside the wire extrusion unit 3 and is arranged near the wire outlet of the wire extrusion unit 3; the wire extrusion unit 3 further includes an inlet pipe fitting 31, a heating throat tube 32, and a wire extrusion nozzle 33 that are sequentially screwed together from top to bottom, and the internal transmission channels of the inlet pipe fitting 31, the heating throat tube 32, and the wire extrusion nozzle 33 are coaxially arranged; a receiving cavity is provided in the heating throat tube 32 and a filter element 34 is arranged directly below the receiving cavity.

[0036] In the working state, the inlet pipe fitting 31, the heated tube, and the wire extrusion nozzle 33 are all fixedly connected by screwing. During the printing operation, the printing wire is vertically inserted into the inlet pipe fitting 31 under the drive of the wire supply unit 2, then enters the heating throat tube 32 along the inlet pipe fitting 31 and is heated to the molten state by the heating unit 4 and finally enters the wire extrusion nozzle 33 and is discharged from the wire outlet. When the printing wire is heated by the heating unit 4, when the molten printing wire enters the interior of the wire extrusion nozzle 33 after passing through the heating throat tube 32, it will be filtered by the filter element 34 before entering the wire extrusion nozzle 33, so as to achieve the purpose of filtering foreign matters; the receiving cavity is used to receive the overflowing printing wire, so that the printing wire still remains in the heating section in the overflow state, thereby avoiding the situation that it overflows back to the inlet of the inlet pipe fitting 31 during the back - overflow process, resulting in the solidification of the printing wire and causing blockage.

[0037] Refer to Figure 6 as shown in

[0038] The filter element 34 includes a fitting 341 and a blocking member 342. The fitting 341 is embedded and coaxially inserted at the bottom of the heating throat 32. A through hole having the same diameter as the internal transmission channel of the heating throat 32 is coaxially formed through the middle of the fitting 341. The blocking member 342 is horizontally arranged across the through hole. A plurality of groups of the blocking members 342 are circumferentially arranged along the axis of the through hole. A blocking net is formed by splicing between the plurality of groups of blocking members 342, and the mesh gaps of the blocking net are all smaller than the wire outlet of the wire outlet nozzle 33.

[0039] The blocking member 342 is composed of a plugging ring 3411 and a limiting ring 3412. The limiting ring 3412 is coaxially and perpendicularly arranged on the plugging ring 3411 to form a fitting 341 in an inverted T shape. The blocking net is composed of alternating overlapping of a plurality of small rectangular strips. During the printing process, when a relatively hard foreign object enters the inside of the wire feeding pipe fitting 31 along the printing wire or through the gap between the printing wire and the wire feeding pipe fitting 31, when the printing wire passes through the heating unit 4 and melts, due to the foreign object being unable to liquefy and still flowing synchronously with the liquefied printing wire, when passing through the blocking net, the foreign object will be isolated in the heating throat 32 under the action of the blocking net and cannot continue to surge towards the direction of the wire outlet nozzle 33, thereby avoiding the problem of blockage at the wire outlet of the wire outlet nozzle 33.

[0040] See Figure 5 and Figure 6 as shown in:

[0041] An annular groove in a funnel shape is also coaxially formed in the heating throat 32, and the annular groove 37 is arranged near the top of the heating throat 32. Three groups of the annular grooves 37 are equidistantly formed along the axis of the heating throat 32 towards the bottom of the heating throat 32. The three groups of annular grooves 37 form the accommodating cavity.

[0042] In the working state, when the printing wire inside the heating throat 32 contacts the filtering unit, the heat energy applied by the heating unit 4 to the wire outlet nozzle 33 will be conducted to the heating throat 32 accordingly, and the printing wire contacting the filtering unit will also melt accordingly. By extending the lengths of the heating throat 32 and the wire outlet nozzle 33 and changing the heating point, the heat conduction path is extended; that is, the heating of the heating wire inside the heating throat 32 is realized, and the heating area can also be greatly reduced, reducing the phenomenon of printing wire backflow; even if there is a slight backflow phenomenon of the printing material, through the blocking of the three groups of annular grooves 37, the printing material can always be blocked in the heating section and will not solidify. And because the annular grooves 37 are all in a funnel shape, when the backflow phenomenon weakens, the printing wire inside the annular groove 37 can still smoothly flow back into the wire outlet nozzle 33.

[0043] See Figure 4 as shown in:

[0044] The heating throat 32 further includes heat dissipation fins 35 and a heat dissipation fan 36; the heat dissipation fins 35 are horizontally arranged outside the heating throat 32, and multiple groups of heat dissipation fins 35 are arranged equidistantly along the axis of the heating throat 32 towards the bottom of the heating throat 32; the heat dissipation fan 36 is detachably arranged on one side of the heat dissipation fins 35 to assist the heat dissipation fins 35 in dissipating heat.

[0045] In the working state, in order to prevent the heat energy generated by the heating unit 4 from continuing to conduct heat energy upwards through the heating throat 32 to the wire feeding pipe fitting 31, the heating throat 32 is continuously cooled by the cooperation of the heat dissipation fan 36 and the heat dissipation fins 35, so that while the heating throat 32 always maintains a basic temperature, the heat energy is prevented from continuing to conduct upwards to the wire feeding pipe fitting 31.

[0046] See Figure 4 as shown in:

[0047] A ring-shaped rubber ring 311 is also coaxially sleeved and installed on the top of the wire feeding pipe fitting 31.

[0048] In the working state, the ring-shaped rubber ring 311 is connected with a clearance fit between the printing wire, and the ring-shaped rubber ring 311 is used to minimize the clearance between the wire feeding pipe fitting 31 and the printing wire, preventing foreign objects from entering the wire feeding pipe fitting 31 along the clearance. Especially when using a printing wire with a relatively small diameter, the clearance between the printing wire and the transmission channel inside the wire feeding pipe fitting 31 will be further increased. At this time, the staff only needs to replace the wire feeding pipe fitting 31 that matches the diameter of the current printing wire.

[0049] See Figure 5 as shown in:

[0050] The heating unit 4 is a high-temperature heating aluminum block 41.

[0051] The high-temperature heating aluminum block 41 is a prior art and will not be elaborated here.

[0052] See Figure 2 as shown in:

[0053] The wire supply unit 2 includes a servo motor 21, a wire feeding wheel 22, a rotating shaft 23, a wire guiding wheel 24, and a connecting piece 25;

[0054] The servo motor 21 is horizontally arranged on the connecting frame 1;

[0055] The wire feeding wheel 22 is coaxially and fixedly arranged on the driving shaft of the servo motor 21;

[0056] The connecting piece 25 is vertically arranged on the connecting frame 1 and is arranged close to the driving end of the servo motor 21. The connecting frame 1 is also coaxially penetrated with a wire inlet hole 251 and a wire outlet hole 252, and the wire feeding wheel 22 is located on the left side of the wire inlet hole 251;

[0057] The wire guiding wheel 24 is arranged on the connecting piece 25 through transmission by a rotating shaft 23 relative to the wire feeding wheel 22 and is located on the right side of the wire inlet hole 251;

[0058] A conduction gap for the printing wire to pass through is left between the wire guiding wheel 24 and the wire feeding wheel 22.

[0059] In the working state, when printing work needs to be carried out, the printing wire is inserted from the wire inlet hole 251, then passes through the conduction gap and the wire outlet hole 252 in sequence, and finally is inserted into the wire outlet unit 3. When the formal printing starts, only an external power supply needs to be connected to drive the servo motor 21 to work. While the output shaft of the servo motor 21 rotates to drive the wire feeding wheel 22 to rotate, the wire guiding wheel 24 cooperates to frictionally feed the printing wire, so as to realize the automatic wire feeding work of the printing wire.

[0060] This application can not only timely stop the molten material but also effectively prevent foreign objects from entering the wire inlet conduit, making the wire feeding during the printing process of the 3D printer smoother and unblocked.

[0061] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A 3D printing anti-deformation wire feeding device, comprising a wire supply unit (2) fixedly arranged at the driving end of a sliding table group through a connecting frame (1); a wire outlet unit (3) vertically arranged directly below the wire supply unit (2) and coaxially arranged with the wire supply end of the wire supply unit (2); a heating unit (4) sleeved and installed outside the wire outlet unit (3) and arranged near the wire outlet of the wire outlet unit (3); characterized in that, The wire feeding unit (3) further includes a wire feeding pipe fitting (31), a heating throat (32), and a wire outlet nozzle (33) that are screwed together in sequence from top to bottom. The internal transmission channels of the wire feeding pipe fitting (31), the heating throat (32), and the wire outlet nozzle (33) are coaxially arranged. A receiving cavity is formed in the heating throat (32), and a filtering element (34) is arranged directly below the receiving cavity. The filtering element (34) includes a fitting member (341) and a blocking member (342). The fitting member (341) is coaxially inserted into the bottom of the heating throat (32) in an embedded manner, and a through hole having the same diameter as the internal transmission channel of the heating throat (32) is coaxially formed through the middle of the fitting member (341). The blocking member (342) is horizontally arranged in the through hole. A plurality of groups of the blocking member (342) are arranged circumferentially along the axis of the through hole. The plurality of groups of the blocking member (342) are spliced to form a blocking net, and the mesh gap of the blocking net is smaller than the wire outlet of the wire outlet nozzle (33). An annular groove (37) in a funnel shape is coaxially formed in the heating throat (32) and is arranged near the top of the heating throat (32). Three groups of the annular grooves (37) are equidistantly formed along the axis of the heating throat (32) towards the bottom of the heating throat (32), and the three groups of the annular grooves (37) form the receiving cavity.

2. The 3D printing anti-deformation wire feeding device according to claim 1, characterized in that, The heating throat (32) further includes heat dissipation fins (35) and a heat dissipation fan (36). The heat dissipation fins (35) are horizontally arranged outside the heating throat (32), and a plurality of groups of the heat dissipation fins (35) are arranged equidistantly along the axis of the heating throat (32) towards the bottom of the heating throat (32). The heat dissipation fan (36) is detachably arranged on one side of the heat dissipation fins (35) to assist the heat dissipation fins (35) in dissipating heat.

3. The 3D printing anti-deformation wire feeding device according to claim 1, characterized in that, An annular rubber ring (311) is coaxially sleeved and installed on the top of the wire feeding pipe fitting (31).

4. The 3D printing anti-deformation wire feeding device according to claim 1, characterized in that, The heating unit (4) is a high-temperature heating aluminum block (41).

5. The 3D printing anti-deformation wire feeding device according to claim 1, characterized in that, The wire supply unit (2) includes a servo motor (21), a wire feeding wheel (22), a rotating shaft (23), a wire guiding wheel (24), and a connecting member (25). The servo motor (21) is horizontally arranged on the connecting frame (1). The wire feeding wheel (22) is coaxially and fixedly arranged on the driving shaft of the servo motor (21). The connecting member (25) is vertically arranged on the connecting frame (1) and is arranged near the driving end of the servo motor (21). A wire inlet hole (251) and a wire outlet hole (252) are coaxially formed through the connecting frame (1). The wire feeding wheel (22) is located on the left side of the wire inlet hole (251). The wire guiding wheel (24) is arranged on the connecting member (25) through the rotating shaft (23) relative to the wire feeding wheel (22) and is located on the right side of the wire inlet hole (251). A conduction gap for the printing wire to pass through is left between the wire guiding wheel (24) and the wire feeding wheel (22).

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