Wire mixing device for 3D printing

Abstract

The application discloses a kind of line material mixing and feeding device for 3D printing, vertical passage and oblique passage are equipped on the barrel;Vertical passage has mixing section and melting section;Oblique passage is arranged up and down obliquely, with the oblique lower end that is communicated with mixing section and the oblique upper end that is away from vertical passage;Mixed discharge mechanism includes rotating shaft that is coaxially arranged in vertical passage;The outside of rotating shaft is sleeved with matched pipe body corresponding mixing section;Matched pipe body is fixedly connected with rotating shaft, and the blanking passage is formed between the two;The outer circumferential surface of matched pipe body is provided with first helical blade;Rotating shaft is provided with second helical blade;The helical direction of first helical blade and second helical blade is opposite;Line cutting mechanism is used for synchronous cutting of line material into each oblique passage.The plastic line material can be fully mixed and uniform in the barrel before melting, so that the color of the plastic line material after mixing and melting can be accurately controlled, and the demand of color 3D printing can be effectively met.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a filament mixing device for 3D printing. Background Technology

[0002] In 3D printing using plastic filaments, the plastic filaments melt, are printed layer by layer through a preset path, and then cooled and solidified to form the finished product.

[0003] Chinese patent document (application number 201510182498.2) discloses a color 3D printing ejector mechanism. By arranging several feeding channels, plastic filaments of different colors can enter the feeding holes through different feeding channels, be chopped, mixed, and melted to form molten materials of different colors, thereby achieving color 3D printing. While the above technical solution can achieve the effect of color 3D printing, it still has the following shortcomings: 1. In the above technical solution, plastic filaments of different colors enter the feed hole through different feed channels and are shredded and mixed at their respective positions by a rotating extrusion screw. The extrusion screw uses helical motion to propel the shredded plastic filaments forward in a straight line within the barrel. Due to the inherent structure of the extrusion screw, before melting, the shredded plastic filaments of different colors move independently within the barrel, making it difficult to achieve optimal and uniform mixing, resulting in color errors after the plastic filaments are mixed and melted.

[0004] 2. In the above technical solution, the plastic wires in each feeding channel are cut by the extrusion screw. It is difficult to cut the plastic wires synchronously within a unit time. The cut plastic wires have inconsistent lengths, making it difficult to accurately control the proportion of plastic wires of different colors before they are mixed and melted.

[0005] 3. In the above technical solution, the plastic filament is clamped and conveyed by two feeding rollers (first feeding roller and second feeding roller). When replacing the plastic filament, it is necessary to disassemble and assemble the feeding rollers and adjust the relative positions of the two feeding rollers to facilitate the insertion and removal of the plastic filament. This filament replacement operation is cumbersome. Since a large number of plastic filaments are used simultaneously in color 3D printing, each set of feeding rollers needs to be operated and adjusted. Replacing the plastic filament is time-consuming and labor-intensive, making it difficult to meet the needs of color 3D printing. Summary of the Invention

[0006] To address the aforementioned technical problems, the purpose of this invention is to provide a filament mixing device for 3D printing, which allows plastic filaments to be fully and uniformly mixed in a barrel before melting, thereby enabling accurate control of the color of the molten plastic filaments and effectively meeting the needs of color 3D printing.

[0007] The technical solution of the present invention is implemented as follows: a 3D printing filament mixing and feeding device, comprising a material cylinder, a mixing and discharging mechanism, a filament cutting mechanism and a heating device; The barrel is provided with a vertical channel and an oblique channel; the vertical channel has a mixing section and a melting section spaced apart along its length; a plurality of oblique channels are arranged at intervals around the outside of the vertical channel; the oblique channels are arranged at an angle, having an inclined lower end close to the vertical channel and connected to the mixing section and an inclined upper end away from the vertical channel. The mixing and discharging mechanism includes a rotating shaft coaxially arranged in a vertical channel and a first driving device for driving the rotating shaft to rotate; a matching tube is sleeved on the outside of the rotating shaft corresponding to the mixing section; the matching tube is fixedly connected to the rotating shaft, and a material discharge channel is formed between the two; a first spiral blade that matches the mixing section is provided on the outer circumferential surface of the matching tube; a second spiral blade that matches the melting section is provided on the rotating shaft; the spiral directions of the first spiral blade and the second spiral blade are opposite. The wire cutting mechanism is used to simultaneously cut the wires entering each of the inclined channels; The heating device is installed on the outer wall of the barrel and is used to heat the internal space of the melting section.

[0008] Furthermore, the outer wall of the barrel is coaxially provided with an annular groove; the annular groove has a cutting position for cutting each of the oblique channels along the width direction of the oblique channels; the wire cutting mechanism includes a cutter disc coaxially arranged on the barrel, a plurality of blades arranged on the cutter disc, and a second driving device for driving the cutter disc to rotate; the blades have a cutting end that extends into the annular groove.

[0009] Furthermore, the wire mixing and feeding device includes a wire feeding mechanism; the wire feeding mechanism includes a feeding unit, a third driving device, and a fourth driving device; The feeding unit is paired with the inclined channel and includes a base, a slider, and a pressing block. The base is positioned at the inclined upper end of the inclined channel and has a first groove extending along the length of the inclined channel. The slider is slidably mounted on the base along the length of the inclined channel. The pressing block is slidably mounted on the slider and has a second groove on its bottom surface along the length of the inclined channel. A clamping space is formed between the first groove and the second groove. The third driving device is used to synchronously drive the sliders of each feeding unit to move back and forth along the length of the inclined channel; the fourth driving device is disposed on the movable end of the third driving device and is used to drive the lower pressing block of each feeding unit to move up and down relative to the slider.

[0010] Furthermore, the third driving device is disposed in the space enclosed by the feeding units, including a first bracket and a first driver for driving the first bracket to move up and down; the first bracket is provided with a first plug-in member extending in the horizontal direction for the slider corresponding to each of the feeding units; the slider is provided with a first plug-in channel extending in the horizontal direction; the first plug-in member and the first plug-in channel are plugged into each other in the horizontal direction.

[0011] Furthermore, the fourth driving device includes a second bracket and a second driver disposed on the first bracket for driving the second bracket to move up and down; the second bracket has a second plug-in member extending in the horizontal direction for each of the feeding units corresponding to the pressing block; the pressing block has a second plug-in channel extending in the horizontal direction; the second plug-in member and the second plug-in channel are plugged into each other in the horizontal direction.

[0012] Furthermore, the wire mixing and feeding device includes a discharge component; the discharge component is threadedly connected to the lower end of the material cylinder; the discharge component has a confluence cavity that communicates with a vertical channel inside, and the discharge component is provided with a discharge port that communicates with the confluence cavity.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. This invention utilizes the combined use of a first and second helical blades. After the plastic filaments in each inclined channel are cut, they first enter the mixing section of the vertical channel. During the rotation of the rotating shaft, the first helical blades initially push the cut plastic filaments upwards in the mixing section. The filaments then fall freely from the top of the fitting tube through the drop channel to the melting section, where they are again pushed downwards by the second helical blades. This combination extends the movement path of the cut plastic filaments in the vertical channel, and the combined movement of the cut filaments—pushed by the first helical blades and falling freely in the drop channel—ensures that the cut filaments are well dispersed during movement. Before melting, the plastic filaments are thoroughly and evenly mixed in the mixing section, allowing for precise control of the color of the molten plastic filaments and effectively meeting the requirements of color 3D printing.

[0014] 2. The present invention, through the use of a wire cutting mechanism, can simultaneously cut the plastic wires in each inclined channel within a unit of time, and the length of the cut plastic wires is accurate and consistent, so as to accurately control the proportion of plastic wires of different colors before they are mixed and melted.

[0015] 3. This invention utilizes a wire feeding mechanism. Under the drive of a third driving device, the sliders of each feeding unit can synchronously reciprocate along the length of the inclined channel. Simultaneously, under the drive of a fourth driving device, the pressing blocks of each feeding unit can synchronously reciprocate up and down relative to the sliders. This allows the first and second wire grooves to move closer or further apart, thereby clamping and releasing the plastic wire between them. This combination of methods ensures that each plastic wire is synchronously fed into the inclined channel at a preset length under the reciprocating motion of the wire feeding mechanism, meeting the requirement of feeding the plastic wire along the inclined direction. When the first and second wire grooves move further apart, the plastic wire can freely enter and exit between them, facilitating the replacement of individual plastic wires. Wire replacement is convenient, time-saving, and labor-saving, effectively meeting the needs of color 3D printing. Attached Figure Description

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the overall structure of the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram with the supporting frame removed; Figure 3 for Figure 2 A top view structural diagram; Figure 4 This is a three-dimensional structural diagram of the material cylinder, mixing and discharging mechanism, wire cutting mechanism and heating device of the present invention; Figure 5 for Figure 4 A sectional view of the structure; Figure 6 for Figure 5 Enlarged view of point A in the image; Figure 7 for Figure 4 Exploded view; Figure 8 This is a three-dimensional structural diagram of the rotating shaft, the first helical blade, and the second helical blade of the present invention. Figure 9 This is a three-dimensional structural diagram of the barrel of the present invention; Figure 10 for Figure 9 A sectional view of the structure; Figure 11 This is a three-dimensional structural schematic diagram of the wire feeding mechanism of the present invention; Figure 12 for Figure 11 Exploded view; Figure 13 for Figure 11A sectional view of the structure; Figure 14 This is a three-dimensional structural schematic diagram of the feeding unit of the present invention; Figure 15 This is a three-dimensional structural diagram of the slider and pressing block of the present invention; The components are as follows: 1. Material cylinder; 11. Vertical channel; 111. Mixing section; 112. Melting section; 12. Inclined channel; 13. Annular groove; 2. Rotating shaft; 21. Fitting tube body; 211. Feeding channel; 22. First spiral blade; 23. Second spiral blade; 3. First driving device; 31. Heating device; 4. Discharge component; 41. Combining cavity; 42. Discharge port; 5. Cutter disc; 51. Blade; 52. Second driving device; 6. Feeding unit; 61. Seat; 611. First groove; 62. Slider; 621. First insertion channel; 63. Lower pressure block; 631. Second insertion channel; 632. Second groove; 7. First bracket; 71. First insertion component; 72. First driver; 8. Second bracket; 81. Second insertion component; 83. Second driver; 9. Support frame. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0018] like Figure 1-15The image shows a 3D printing filament mixing and feeding device according to this embodiment. This device is installed on the main structure of a 3D printing equipment and is suitable for color 3D printing of plastic filaments. The plastic filament in this embodiment is a linear material with a continuous length. The mixing and feeding device includes a support frame 9, a material cylinder 1, a mixing and discharging mechanism, a filament cutting mechanism, and a heating device 31. The material cylinder 1 is fixedly installed on the support frame. The material cylinder 1 has a central axis and a circumferential direction surrounding the central axis. During installation, the material cylinder 1 is placed vertically, and vertical channels 11 and oblique channels 12 are machined on the material cylinder 1. The vertical channel 11 extends along the central axis and has mixing sections 111 and melting sections 112 spaced apart along its length. The mixing section 111 is located above the melting section 112. Several oblique channels 12 surround the outside of the vertical channel 11 and are spaced apart along the circumferential direction of the material cylinder 1. In this embodiment, there are four oblique channels 12. The inclined channel 12 is arranged at an angle, with its length extending at an angle to the central axis of the material cylinder 1 in a vertical plane. In this embodiment, the angle is preferably 45°. The inclined channel 12 has an inclined lower end and an inclined upper end. The inclined lower end of the inclined channel 12 is close to the vertical channel 11 and communicates with the mixing section 111 through a connecting hole, while the inclined upper end of the inclined channel 12 is away from the vertical channel 11. The inner diameter of the inclined channel 12 is adapted to the outer diameter of the plastic wire so that the plastic wire can be inserted into the inclined channel 12.

[0019] The aforementioned mixing and discharging mechanism includes a rotating shaft 2 coaxially mounted in the vertical channel 11 and a first driving device 3. The first driving device 3 is located at the top of the material cylinder 1 and is connected to the top of the rotating shaft 2 for driving the rotating shaft 2 to rotate. The first driving device 3 is preferably a motor of the prior art. A hollow fitting tube 21 is sleeved on the outside of the rotating shaft 2 corresponding to the mixing section 111. The central axis of the fitting tube 21 coincides with the central axis of the rotating shaft 2. The fitting tube 21 is inserted and positioned with the rotating shaft 2 along the central axis direction and locked in place by positioning screws, so that the fitting tube 21 and the rotating shaft 2 are fixedly connected. A fitting space is formed between the outer peripheral surface of the fitting tube 21 and the inner peripheral surface of the vertical channel 11, and a material discharge channel is formed between the inner peripheral surface of the fitting tube 21 and the outer peripheral surface of the rotating shaft 2. A first spiral blade 22 that cooperates with the mixing section 111 is machined on the outer peripheral surface of the fitting tube 21. The first spiral blade 22 extends in a spiral direction around the central axis of the fitting tube 21. The first helical blade 22 is arranged in the aforementioned mating space, and it is in clearance fit with the inner circumferential surface of the mixing section 111. A second helical blade 23 is machined on the rotating shaft 2 to mate with the melting section 112. The second helical blade 23 extends in a helical direction around the central axis of the rotating shaft 2. The second helical blade 23 is in clearance fit with the inner circumferential surface of the melting section 112. The helical directions of the first helical blade 22 and the second helical blade 23 are opposite. Through the above structural design, when the rotating shaft 2 rotates in one direction, the helical advance directions of the first helical blade 22 and the second helical blade 23 are opposite.

[0020] The aforementioned wire cutting mechanism is arranged on the barrel 1 to simultaneously cut the wires entering each of the inclined channels 12. The cut wires automatically slide down into the mixing section 111 of the vertical channel 11. When the rotating shaft 2 is driven to rotate, the first helical blade 22 pushes the plastic wires entering the mixing section 111 upward to the top of the fitting tube 21, then into the discharge channel, and falls into the melting section 112 of the vertical channel 11. The second helical blade 23 pushes the plastic wires downward in the melting section 112. Specifically, an annular groove 13 is machined along the circumferential direction on the outer wall of the barrel 1. The depth direction of the annular groove 13 is perpendicular to the length extension direction of the inclined channel 12, and the annular groove 13 passes through each of the inclined channels 12, so that the annular groove 13 has a cutting position for cutting each of the inclined channels 12 along the width direction of the inclined channel 12 (the radial direction of the inclined channel 12 or the direction perpendicular to the length extension direction of the inclined channel 12). The aforementioned wire cutting mechanism includes a cutter head 5, blades 51, and a second drive device 52. The cutter head 5 is mounted on the outer wall of the material cylinder 1 via bearings, allowing it to rotate about the central axis of the material cylinder 1. The number of blades 51 matches the number of inclined channels 12, and they are fixedly mounted on the cutter head 5. Each blade 51 has a cutting end that extends into an annular groove 13. When the cutter head 5 rotates, the blades 51 move within the annular groove 13, cutting the plastic wire inserted into the inclined channel 12 from the cutting position. The side of each blade 51 is machined into a cutting edge. The aforementioned second drive device 52 is a gear transmission mechanism, fixed to a support frame, used to drive the cutter head 5 to rotate. Through this structural design, the wire cutting mechanism can accurately control the proportion of different colored plastic wires before they are mixed and melted, ensuring consistent cutting length within a unit of time.

[0021] In this embodiment, the aforementioned heating device 31 is arranged on the outer wall of the barrel 1 to heat the internal space of the melting section 112. This heating device 31 is a conventional device of the prior art, preferably an electric heating coil. The heating device 31 heats the barrel 1 and then transfers the heat to the plastic wire entering the melting section 112 to melt the plastic wire.

[0022] The discharge component 4 is installed at the lower end of the material cylinder 1 via a threaded connection. The discharge component 4 has a confluence cavity 41 that communicates with the vertical channel 11. The discharge component 4 has an outlet 42 that communicates with the confluence cavity 41. The plastic filament molten by the melting section 112 is pushed into the confluence cavity 41 by the second helical blade 23 and then output from the outlet 42 for 3D printing.

[0023] like Figure 11-13As shown, a wire feeding mechanism is arranged above the material cylinder 1. This mechanism allows plastic wires to be fed into the corresponding inclined channel 12. The wire feeding mechanism includes a feeding unit 6, a third drive device, and a fourth drive device. The feeding unit 6 is paired with the inclined channel 12. The feeding unit 6 is connected to the inclined upper end of the inclined channel 12. The feeding unit 6 includes a base 61, a slider 62, and a pressing block 63. The base 61 is fixed to a support frame. The base 61 is positioned corresponding to the inclined upper end of the inclined channel 12, and a first groove 611 extending along the length of the inclined channel 12 is machined on its top surface. This first groove 611 is an arc-shaped groove adapted to fit the plastic wire. The slider 62 is slidably mounted on the base 61 along the length of the inclined channel 12 via a groove, allowing the slider 62 to move towards or away from the inclined upper end of the inclined channel 12. The pressing block 63 is slidably mounted on the slider 62 via a groove. A second groove 632, along the length of the inclined channel 12, is machined on the bottom surface of the pressing block 63. This second groove 632 is arc-shaped and adapts to the plastic wire. The first groove 611 and the second groove 632 correspond vertically, forming a clamping space between them. When the plastic wire is placed in this clamping space, the pressing block 63 moves up and down to clamp and release the plastic wire.

[0024] The aforementioned third drive device is arranged on the support frame 9 to synchronously drive the sliders 62 of each feeding unit 6 to move back and forth along the length of the inclined channel 12. A fourth drive device is mounted on the movable end of the third drive device to drive the lower pressure block 63 of each feeding unit 6 to move up and down relative to the slider 62. Through this structural design, the lower pressure block 63, driven by the fourth drive device, can be moved up and down to clamp or release the plastic wire between the first groove 611 and the second groove 632. When the plastic wire is clamped, the fourth drive device and the slider 62 move as a whole, driven by the third drive device, to push the plastic wire towards the inclined upper end of the inclined channel 12, thus achieving feeding. The reciprocating motion of the third drive device drives the slider 62 and the fourth drive device to reciprocate along the length of the inclined channel 12, and the reciprocating motion of the fourth drive device drives the lower pressure block 63 to reciprocate up and down, thereby continuously feeding the plastic wire into the inclined channel 12.

[0025] In the specific structural design, the aforementioned third driving device is arranged in the space enclosed by each feeding unit 6. This third driving device includes a first support 7 and a first driver 72. The first support 7 is movably mounted on the support frame via a guide rod. The first driver 72 is fixed to the support frame, with its movable end connected to the support frame to drive the support frame to move up and down. The first support 7 has a first insertion member 71 extending horizontally corresponding to the slider 62 of each feeding unit 6. A first insertion channel 621 extending horizontally is machined on the slider 62 corresponding to the first insertion member 71. The first insertion member 71 and the first insertion channel 621 are inserted and engaged horizontally. Through this structural design, when the first support 7 drives the first insertion member 71 to move up and down, the first insertion member 71 moves horizontally back and forth relative to the slider 62 in the first insertion channel 621, thus driving the slider 62 to move up and down.

[0026] The aforementioned fourth driving device includes a second bracket 8 and a second driver 82. The second bracket 8 is slidably arranged on the guide rod of the aforementioned first bracket 7. The second driver 82 is fixed to the first bracket 7, and its movable end is fixedly connected to the second bracket 8 so as to drive the second bracket 8 to move up and down. The second bracket 8 has a second insertion member 81 extending horizontally on the lower pressing block 63 corresponding to each feeding unit 6. The lower pressing block 63 is machined with a second insertion channel 631 extending horizontally on the second insertion member 81. The second insertion member 81 and the second insertion channel 631 are inserted and engaged horizontally. With the above structural design, when the second bracket 8 drives the second insertion member 81 to move up and down, the second insertion member 81 moves horizontally back and forth in the second insertion channel 631 relative to the lower pressing block 63, and drives the lower pressing block 63 to move up and down. At the same time, when the first bracket 7 moves up and down back and forth, the lower pressing block 63 and the slider 62 as a whole can move back and forth along the length extension direction of the inclined channel 12.

[0027] The aforementioned first driver 72 and second driver 82 are conventional devices in the prior art, both having a linearly moving movable end, and can be selected from devices such as cam mechanisms and electric push rods.

[0028] This embodiment is equipped with a controller with an embedded control program. The controller is electrically connected to the aforementioned mixing and discharging mechanism, wire cutting mechanism, and wire feeding mechanism to coordinate the movement of these mechanisms.

[0029] During the actual feeding process, based on the color requirements of the final printed product, plastic filaments of different colors are inserted into each feeding unit 6 between the first filament groove 611 and the second filament groove 632, and then enter the corresponding inclined channel 12. Driven by the third driving device, the slider 62 of each feeding unit 6 moves synchronously back and forth along the length of the inclined channel 12, and the pressing block 63 of each feeding unit 6 moves synchronously up and down relative to the slider 62 under the drive of the fourth driving device. This allows the first filament groove 611 and the second filament groove 632 to move closer or further apart, thereby clamping and releasing the plastic filaments between the first filament groove 611 and the second filament groove 632. Through the reciprocating motion of the third and fourth driving devices, each plastic filament is synchronously fed into each inclined channel 12 at a preset length to meet the requirement of feeding plastic filaments along the inclined direction. When it is necessary to replace the plastic filament, the first filament groove 611 and the second filament groove 632 are driven to move away from each other, and the plastic filament can freely enter and exit between the first filament groove 611 and the second filament groove 632, so as to facilitate the entry and exit of each plastic filament for replacement. The plastic filament replacement operation is convenient, time-saving and labor-saving, and effectively meets the filament feeding needs of color 3D printing.

[0030] During the specific mixing and discharge process, the wire feeding mechanism continuously feeds wire into each inclined channel 12, while the cutting mechanism simultaneously cuts the plastic wire in each inclined channel 12. The cut plastic wire slides into the mixing section 111 of the vertical channel 11. After being cut, the plastic wire in each inclined channel 12 first enters the mixing section 111 of the vertical channel 11. During the rotation of the rotating shaft 2, the first helical blade 22 first pushes the cut plastic wire upward in the mixing section 111 to achieve initial mixing. The aforementioned plastic wire then falls freely from the top of the mating tube 21 through the discharge channel to the melting section 112 for further mixing, and is then pushed downward by the second helical blade 23 for further mixing. The combination of the above methods extends the movement path of the cut plastic filaments in the vertical channel 11. The cut plastic filaments undergo a combination of three motion modes: being propelled by the first helical blade 22, falling freely in the feeding channel, and being propelled by the second helical blade 23. This ensures that the cut plastic filaments are well dispersed during movement. Plastic filaments of different colors can be thoroughly and evenly mixed in the mixing section 111, and after melting in the melting section 112, a mixed color is formed. This allows for precise control of the color of the mixed and melted plastic filaments, effectively meeting the needs of color 3D printing.

[0031] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A filament mixing and feeding device for 3D printing, comprising a material cylinder, a mixing and discharging mechanism, a filament cutting mechanism, and a heating device; characterized in that: The barrel is provided with a vertical channel and an oblique channel; the vertical channel has a mixing section and a melting section spaced apart along its length; a plurality of oblique channels are arranged at intervals around the outside of the vertical channel; the oblique channels are arranged at an angle, having an inclined lower end close to the vertical channel and connected to the mixing section and an inclined upper end away from the vertical channel. The mixing and discharging mechanism includes a rotating shaft coaxially arranged in a vertical channel and a first driving device for driving the rotating shaft to rotate; a matching tube is sleeved on the outside of the rotating shaft corresponding to the mixing section; the matching tube is fixedly connected to the rotating shaft, and a material discharge channel is formed between the two; a first spiral blade that matches the mixing section is provided on the outer circumferential surface of the matching tube; a second spiral blade that matches the melting section is provided on the rotating shaft; the spiral directions of the first spiral blade and the second spiral blade are opposite. The wire cutting mechanism is used to simultaneously cut the wires entering each of the inclined channels; The heating device is installed on the outer wall of the material cylinder and is used to heat the internal space of the melting section; The outer wall of the material cylinder is coaxially provided with an annular groove; the annular groove has a cutting position for cutting off each of the oblique channels along the width direction of the oblique channels; the wire cutting mechanism includes a cutter disc coaxially arranged on the material cylinder, a plurality of blades arranged on the cutter disc, and a second driving device for driving the cutter disc to rotate; the blades have a cutting end that extends into the annular groove.

2. The filament mixing and feeding device for 3D printing according to claim 1, characterized in that: The wire mixing and feeding device includes a wire feeding mechanism; the wire feeding mechanism includes a feeding unit, a third driving device, and a fourth driving device; The feeding unit is paired with the inclined channel and includes a base, a slider, and a pressing block. The base is positioned at the inclined upper end of the inclined channel and has a first groove extending along the length of the inclined channel. The slider is slidably mounted on the base along the length of the inclined channel. The pressing block is slidably mounted on the slider and has a second groove on its bottom surface along the length of the inclined channel. A clamping space is formed between the first groove and the second groove. The third driving device is used to synchronously drive the sliders of each feeding unit to move back and forth along the length of the inclined channel; the fourth driving device is disposed on the movable end of the third driving device and is used to drive the lower pressing block of each feeding unit to move up and down relative to the slider.

3. A 3D printing filament mixing and feeding device according to claim 2, characterized in that: The third driving device is disposed in the space enclosed by the feeding units, and includes a first bracket and a first driver for driving the first bracket to move up and down; the first bracket is provided with a first plug-in member extending in the horizontal direction for each slider corresponding to the feeding unit; the slider is provided with a first plug-in channel extending in the horizontal direction; the first plug-in member and the first plug-in channel are plugged into each other in the horizontal direction.

4. A 3D printing filament mixing and feeding device according to claim 2, characterized in that: The fourth driving device includes a second bracket and a second driver disposed on the first bracket for driving the second bracket to move up and down; the second bracket has a second plug-in member extending in the horizontal direction on the pressing block corresponding to each of the feeding units; the pressing block has a second plug-in channel extending in the horizontal direction; the second plug-in member and the second plug-in channel are plugged into each other in the horizontal direction.

5. A 3D printing filament mixing and feeding device according to claim 1, characterized in that: The wire mixing and feeding device includes a discharge component; the discharge component is threadedly connected to the lower end of the material cylinder; the discharge component has a confluence cavity that communicates with a vertical channel inside, and the discharge component is provided with a discharge port that communicates with the confluence cavity.

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