A 3D printing head for fused deposition modeling

Abstract

The present application relates to the technical field of printing head, in particular to a kind of 3D printing head for fused deposition modeling, including support;Rotary shaft is rotationally arranged at the bottom of the support;Rotary disc is fixedly arranged at the bottom of the rotary shaft;The rotary shaft is coaxially arranged with rotary disc;Multiple nozzles are arranged in the circumferential direction at the bottom of the rotary disc;Preheating mechanism, feeding mechanism and waste discharge mechanism are sequentially arranged along the circumferential direction of the rotary disc in the support.The present application is integrated with multiple groups of nozzles with containing grooves in the circumferential direction of rotary disc, and preheating station, feeding station and pulling material and cleaning station are arranged correspondingly, with each indexing rotation of rotary disc, each nozzle is sequentially transferred to the corresponding station and synchronously completes the work;Preheating station realizes the insertion of heat conduction block, feeding station realizes the alignment of discharge port, cleaning station realizes the pulling of material pin and ejection, and the work station switching and process operation are synchronously completed, effectively improving the overall operation efficiency of multi-material replacement printing.

Description

Technical Field

[0001] This invention relates to the field of printhead technology, and more specifically to a 3D printhead for fused deposition modeling. Background Technology

[0002] With the rapid development of multi-material and multi-process 3D printing technology, the demand for a single printing machine to integrate multiple printing materials and adapt to nozzles with different functions is increasing. In the process of changing materials in multi-material printing, multiple processes such as nozzle preheating, material filling, nozzle switching, and residual waste cleaning need to be completed in sequence to ensure the continuity of the printing process and the quality of the finished product.

[0003] The existing equipment uses a separate design for processes such as nozzle preheating, material filling, and waste cleaning. Each process is equipped with an independent drive actuator, which not only results in low equipment integration and large space occupation, but also in the independent control of each process, poor synchronization, and low process connection efficiency. Multiple drive sources also further increase the probability of equipment failure and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a 3D printing head for fused deposition modeling.

[0005] The objective of this invention is achieved through the following technical solution: a 3D printing head for fused deposition modeling, comprising a support; a rotating shaft rotatably mounted at the bottom of the support; a rotating disk fixedly mounted at the bottom of the rotating shaft; the rotating shaft and the rotating disk being coaxially arranged; and a plurality of nozzles arranged circumferentially at the bottom of the rotating disk. The support is provided with a preheating mechanism, a feeding mechanism and a waste discharge mechanism in sequence along the circumference of the rotating disk.

[0006] The invention is further configured such that the nozzle is provided with a flow channel; the top of the rotating disk is provided with a sealing ring; and the sealing ring is provided with a receiving groove communicating with the top of the flow channel.

[0007] The present invention is further configured such that the feeding mechanism includes a feeding frame mounted on a support, a heat-conducting shell mounted on the feeding frame, a feeding channel disposed within the heat-conducting shell, a feeding screw rotating within the feeding channel, and a motor mounted on the feeding frame; the output end of the motor is connected to the feeding screw; the feeding frame has an inlet communicating with the top of the feeding channel; the feeding frame has a feeding port communicating with the inlet; a first heating element is disposed within the heat-conducting shell; the bottom of the heat-conducting shell has an outlet communicating with the bottom of the feeding channel; the outlet is disposed at the top of the receiving groove; the feeding channel and the feeding screw both extend along the height direction.

[0008] The present invention is further configured such that a lifting frame is movably mounted at the bottom of the support; the lifting frame is movably mounted at the top of the sealing ring; and the preheating mechanism and the waste discharge mechanism are respectively mounted at both ends of the lifting frame along the diameter direction of the rotating disk.

[0009] The present invention is further configured such that the preheating mechanism includes a heat-conducting block disposed at one end of the lifting frame and a second heating element disposed within the heat-conducting block.

[0010] The invention is further configured such that the waste discharge mechanism includes a material pulling pin located at the other end of the lifting frame; the material pulling pin is provided with a push-out channel; the push-out channel is provided with a push rod that is movably lifted; the top of the push rod is provided with a top block; a return spring is provided between the bottom of the top block and the push-out channel; and the bottom of the bracket is provided with a top plate for abutting against the top of the top block.

[0011] The present invention is further configured such that the bottom of the pulling pin is provided with a pulling frustum; the ejection channel is provided through the pulling frustum.

[0012] The present invention is further configured such that the bracket has a waste box at the bottom of the pull pin; the waste box has a clearance slot for making way for the receiving groove; and the bottom of the top rod has an inclined surface.

[0013] The invention is further configured such that: a clearance hole is provided in the middle of the lifting frame; the clearance hole passes through the outside of the rotating shaft; a drive pin is provided on the inner wall of the clearance hole; a drive spring is provided between the drive pin and the inner wall of the clearance hole; a push rod is provided on the bracket; the output end of the push rod is connected to the lifting frame; a drive groove is provided on the outer wall of the rotating shaft; and the drive pin is movably disposed in the drive groove.

[0014] The invention is further configured such that the driving groove includes a plurality of vertical driving grooves and a plurality of spiral driving grooves arranged alternately along the circumferential direction; the vertical driving groove is provided with a stop boss and a guide slope; the guide slope is located at the top of the stop boss; the top of the vertical driving groove is connected to the top of the previous spiral driving groove; the depth of the top of the vertical driving groove is greater than the depth of the spiral driving groove; the bottom of the vertical driving groove is connected to the bottom of the next spiral driving groove; the connection between the bottom of the vertical driving groove and the bottom of the next spiral driving groove is located at the bottom of the stop boss; the depth of the vertical driving groove at the bottom of the stop boss is the same as the depth of the spiral driving groove.

[0015] The beneficial effects of this invention are as follows: This invention integrates multiple sets of nozzles with receiving grooves along the circumference of the rotating disk, and arranges them in a corresponding manner for the preheating station, the feeding station, and the material pulling and waste removal station. With each indexing rotation of the rotating disk, each nozzle flows to the corresponding station in sequence and completes the operation synchronously. The preheating station realizes the insertion and preheating of the heat-conducting block, the feeding station realizes the alignment of the material outlet with the filler, and the waste removal station realizes the material pulling pin extraction and ejection. The station switching and process operation are completed synchronously, which effectively improves the overall operation efficiency of multi-material changing printing. Attached Figure Description

[0016] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 yes Figure 3 A magnified view of part A in the middle; Figure 5 This is a cross-sectional view from another perspective of the present invention; Figure 6 yes Figure 5 A magnified view of part B in the middle; Figure 7 This is a schematic diagram of the structure of the hidden support and feeding mechanism of the present invention; The components include: 1. Support; 11. Top plate; 12. Push rod; 2. Rotating shaft; 21. Vertical drive groove; 22. Spiral drive groove; 23. Abutting boss; 24. Guide slope; 3. Rotating disk; 31. Sealing ring; 32. Receiving groove; 4. Nozzle; 41. Flow channel; 5. Feeding rack; 51. Heat-conducting shell; 52. Feeding channel; 53. Feeding screw; 54. Motor; 55. Feed inlet; 56. Feeding port; 57. First heating element; 58. Discharge port; 6. Lifting frame; 61. Clearance perforation; 62. Drive pin; 63. Drive spring; 71. Heat-conducting block; 72. Second heating element; 8. Pulling pin; 81. Ejection channel; 82. Push rod; 83. Push block; 84. Reset spring; 85. Pulling round platform; 86. Inclined surface; 9. Waste box; 91. Clearance slot. Detailed Implementation

[0018] The present invention will be further described in conjunction with the following embodiments.

[0019] Depend on Figures 1 to 7As can be seen, the 3D printing head for fused deposition modeling described in this embodiment includes a support 1; a rotating shaft 2 is rotatably provided at the bottom of the support 1; a rotating disk 3 is fixedly provided at the bottom of the rotating shaft 2; the rotating shaft 2 and the rotating disk 3 are coaxially arranged; a plurality of nozzles 4 are arranged along the circumferential direction at the bottom of the rotating disk 3; a preheating mechanism, a feeding mechanism and a waste discharge mechanism are sequentially provided on the support 1 along the circumferential direction of the rotating disk 3.

[0020] Specifically, in this embodiment, the 3D printing head for fused deposition modeling rotates around its own axis during operation, synchronously driving the rotating disk 3, which is coaxially fixed at the bottom, to rotate in a circular motion. Multiple nozzles 4 arranged circumferentially at the bottom of the rotating disk 3 flow synchronously with the rotating disk, passing through three fixed stations corresponding to the preheating mechanism, the feeding mechanism, and the waste removal mechanism in sequence. Each nozzle 4 completes preheating at the preheating station, completes molten material filling at the feeding station, and completes residual waste cleaning at the waste removal station, and finally flows to the printing station to perform the printing operation.

[0021] This embodiment achieves the cyclic operation of multiple nozzles 4 through the rotation of the rotating disk 3. It can simultaneously carry multiple nozzles 4 of different types or materials, and can complete the printing of multiple materials without manual replacement of the print head. In addition, the preheating mechanism, the feeding mechanism and the waste discharge mechanism are fixedly arranged along the circumference, with a compact workstation layout and high space utilization. It can cooperate with the indexing rotation of the rotating disk 3 to realize the fully automated flow operation.

[0022] This embodiment describes a 3D printing head for fused deposition modeling. The nozzle 4 has a through-flow channel 41. The top of the rotating disk 3 has a sealing ring 31. The sealing ring 31 has a receiving groove 32 that communicates with the top of the flow channel 41. Specifically, the flow channel 41 inside the nozzle 4 is a transport channel for the molten printing material. The receiving groove 32 is integrated into the top of the rotating disk 3 via the sealing ring 31, corresponding one-to-one with the flow channel 41 of the nozzle 4 below and communicating throughout. When the rotating disk 3 drives the nozzle 4 to the corresponding station, the actuators of the preheating mechanism, the feeding mechanism, and the waste removal mechanism all connect with the nozzle 4 by inserting into the receiving groove 32. The top surface of the sealing ring 31 fits against the end faces of the actuators of the preheating mechanism, the feeding mechanism, and the waste removal mechanism to form a seal. In this embodiment, a standardized universal docking interface is formed through the receiving groove 32, which can adapt to the plugging operation requirements of different work stations and eliminate the need to set a docking structure on each nozzle 4 separately. The sealing ring 31 can ensure the sealing of the docking surface, prevent molten material from overflowing from the docking gap during feeding, and at the same time reduce the wear of the top surface of the rotating disk 3, thus improving the service life of the equipment.

[0023] This embodiment describes a 3D printing head for fused deposition modeling. The feeding mechanism includes a feeding frame 5 mounted on a support 1, a heat-conducting shell 51 mounted on the feeding frame 5, a feeding channel 52 located within the heat-conducting shell 51, a feeding screw 53 rotatably mounted on the feeding channel 52, and a motor 54 mounted on the feeding frame 5. The output end of the motor 54 is connected to the feeding screw 53. The feeding frame 5 has an inlet 55 communicating with the top of the feeding channel 52. The feeding frame 5 also has a feeding port 56 communicating with the inlet 55. A first heating element 57 is located within the heat-conducting shell 51. The bottom of the heat-conducting shell 51 has an outlet 58 communicating with the bottom of the feeding channel 52. The outlet 58 is located at the top of the receiving groove 32. Both the feeding channel 52 and the feeding screw 53 extend along the height direction.

[0024] Specifically, during operation, the printing material is fed into the loading port 56 from the outside and falls into the top of the vertically set feeding channel 52 through the feeding port 55. After the motor 54 starts, it drives the feeding screw 53 to rotate in the feeding channel 52. The screw's spiral pushing force drives the filament to be conveyed vertically downward along the feeding channel 52. During the conveying process, the first heating element 57 is energized and heats up. The heat is transferred to the outer wall of the entire feeding channel 52 through the heat-conducting shell 51, continuously heating the printing material in the channel and causing the printing material to gradually melt into a fluid state. The molten material is conveyed to the discharge port 58 at the bottom of the feeding channel 52 under the continuous pushing of the screw. When the rotating disk 3 rotates so that the receiving groove 32 of the corresponding nozzle 4 is aligned directly below the discharge port 58, the molten material is squeezed downward from the discharge port 58, enters the flow channel 41 of the nozzle 4 through the receiving groove 32, and completes the filling operation of the nozzle 4.

[0025] This embodiment describes a 3D printing head for fused deposition modeling. The bottom of the support 1 is equipped with a lifting frame 6, which is movably mounted on top of the sealing ring 31. The preheating mechanism and the waste removal mechanism are respectively located at both ends of the lifting frame 6 along the diameter of the rotating disk 3. Specifically, the lifting frame 6 reciprocates vertically, moving up and down on the plane above the sealing ring 31. The two ends of the lifting frame 6 along its diameter respectively support the preheating mechanism and the waste removal mechanism, which move synchronously with the lifting frame 6. When the lifting frame 6 descends, the preheating mechanism inserts downward into the corresponding receiving slot 32 to perform preheating, while the waste removal mechanism inserts downward into the corresponding receiving slot 32 to perform material pulling. The operations of the two positions are completed synchronously. When the lifting frame 6 ascends, the preheating mechanism and the waste removal mechanism rise synchronously, completely disengaging from the receiving slot 32, providing clearance for the rotation of the rotating disk 3. After the position switching is completed, it descends again to perform the next round of operations.

[0026] This embodiment describes a 3D printing head for fused deposition modeling. The preheating mechanism includes a heat-conducting block 71 located at one end of the lifting frame 6 and a second heating element 72 located within the heat-conducting block 71. Specifically, the second heating element 72 is pre-energized to generate heat, which is rapidly conducted to the entire heat-conducting block 71, raising the overall temperature of the heat-conducting block 71 to a preset preheating temperature. When the lifting frame 6 descends, the heat-conducting block 71 moves vertically downwards synchronously with the lifting frame 6, and its lower end inserts into the receiving groove 32 of the corresponding station. The heat-conducting block 71 rapidly heats the inner wall of the receiving groove 32, the sealing ring 31, and the upper part of the flow channel 41 of the nozzle 4 below, raising the overall temperature of the nozzle 4 to the melting temperature required for printing, thus preventing the cold nozzle 4 from cooling and solidifying when it comes into contact with the molten material and causing blockage. After preheating, the lifting frame 6 moves upwards, causing the heat-conducting block 71 to move upwards synchronously, completely disengaging from the receiving groove 32, ending the preheating process of the nozzle 4. The nozzle 4 then flows with the rotating disk 3 to the loading station for filling.

[0027] The 3D printing head for fused deposition modeling described in this embodiment includes a waste removal mechanism comprising a material pulling pin 8 located at the other end of a lifting frame 6; the material pulling pin 8 is provided with an ejection channel 81; the ejection channel 81 is provided with a lifting rod 82; the top of the lifting rod 82 is provided with a top block 83; a return spring 84 is provided between the bottom of the top block 83 and the ejection channel 81; and the bottom of the support 1 is provided with a top plate 11 for abutting against the top of the top block 83.

[0028] Specifically, when nozzle 4 moves to the waste discharge station to clean up residual solidified material, the lifting frame 6 descends, causing the pull pin 8 to move vertically downwards simultaneously. The lower end of the pull pin 8 passes through the receiving groove 32 and extends into the flow channel 41 of nozzle 4. At this time, the molten printing material remaining in the flow channel 41 will cover the lower end of the pull pin 8. After the material in the flow channel 41 cools and solidifies, the solidified material is firmly bonded to the lower end of the pull pin 8. At this time, the lifting frame 6 moves upwards, causing the pull pin 8 to move upwards simultaneously. Through the pulling force, the solidified waste material is pulled out from the flow channel 41 of nozzle 4 as a whole, completing the material extraction action. As the lifting frame 6 continues to move upwards, the pull pin 8 carries... As the waste material continues to rise, when the top block 83 at the top of the top rod 82 contacts the top plate 11 fixed at the bottom of the bracket 1, the top plate 11 exerts a downward resisting force on the top block 83. As the lifting frame 6 moves further upward, this resisting force overcomes the elastic force of the return spring 84, pushing the top rod 82 to move downward relative to the pull pin 8 along the ejection channel 81. The lower end of the top rod 82 extends out and acts on the top surface of the solidified waste material, pushing the waste material out and falling off from the lower end of the pull pin 8. After the waste material is ejected, the lifting frame 6 turns downward, the top block 83 loses the pressure of the top plate 11, and the return spring 84 releases its elastic force to drive the top rod 82 to return to the initial position, waiting for the next waste discharge cycle.

[0029] This embodiment describes a 3D printing head for fused deposition modeling, wherein the bottom of the pull pin 8 is provided with a pull frustum 85; the ejection channel 81 extends through the pull frustum 85. After the pull pin 8 descends and extends into the flow channel 41 of the nozzle 4, the molten printing material will fully cover the outer peripheral side, bottom surface, and stepped surface of the pull frustum 85. After the material cools and solidifies, the solidified material and the pull frustum 85 form an axially engaged structure. When the pull pin 8 moves upward to pull the material, the stepped surface of the pull frustum 85 can provide sufficient axial pulling force for the solidified waste material, preventing the material from slipping off the end of the pull pin 8 during the pulling process, and ensuring that the entire section of residual material can be completely extracted. During the ejection operation, the ejector rod 82 extends downward from the ejection channel 81 in the center of the pull frustum 85, directly acting on the top surface of the solidified waste material, and ejecting the waste material from the pull frustum 85.

[0030] The 3D printing head for fused deposition modeling described in this embodiment has a waste box 9 at the bottom of the pull pin 8 on the support 1; the waste box 9 has a clearance slot 91 for making way for the receiving groove 32; and the bottom of the push rod 82 has an inclined surface 86.

[0031] Specifically, when ejecting the waste, the inclined surface 86 at the bottom of the ejector rod 82 first contacts the top surface of the solidified waste. Since the bottom end of the inclined surface 86 is an eccentric structure, the point of application of the ejection force is deviated from the center of the solidified waste, causing the waste to be subjected to eccentric force and overturning torque. While being ejected, the waste tilts and flips, flying out obliquely in the inclined direction instead of falling vertically in the vertical direction. The waste box 9 is located in the area below the pull pin 8. The tilted waste can fall directly into the waste box 9, realizing the unified collection of waste. The clearance slot 91 opened on the waste box 9 corresponds to the rotation path of the receiving slot 32. When the rotating disk 3 drives the receiving slot 32 and the nozzle 4 to rotate and switch positions, the receiving slot 32 can pass through the clearance slot 91 without structural interference with the waste box 9.

[0032] This embodiment describes a 3D printing head for fused deposition modeling. The lifting frame 6 has a clearance hole 61 in its center; the clearance hole 61 passes through the outside of the rotating shaft 2; a drive pin 62 is movably mounted on the inner wall of the clearance hole 61; a drive spring 63 is provided between the drive pin 62 and the inner wall of the clearance hole 61; a push rod 12 is provided on the support 1; the output end of the push rod 12 is connected to the lifting frame 6; a drive groove is provided on the outer wall of the rotating shaft 2; and the drive pin 62 is movably mounted in the drive groove. Specifically, the output end of the push rod 12 performs a vertical extension and retraction movement, directly pushing the lifting frame 6 to perform a reciprocating lifting and lowering movement along the axial direction of the rotating shaft 2; the clearance through hole 61 in the middle of the lifting frame 6 is fitted on the outside of the rotating shaft 2, providing clearance space for the rotating shaft 2, ensuring that the lifting frame 6 will not structurally interfere with the fixed rotating shaft 2 when it moves up and down; the drive spring 63 is always in a compressed state, applying a radial elastic force to the drive pin 62 pointing towards the rotating shaft 2, so that the end of the drive pin 62 is always pressed into the drive groove on the outer wall of the rotating shaft 2, ensuring that the drive pin 62 is fully engaged in the drive groove and will not come out of the groove; when the lifting frame 6 performs a vertical lifting and lowering movement, the drive pin 62 moves synchronously with the lifting frame 6 in the vertical direction, and the drive groove generates a circumferential component force on the drive pin 62, thereby driving the rotating shaft 2 to rotate circumferentially around its own axis, thus converting the linear lifting and lowering movement of the lifting frame 6 into the intermittent rotational movement of the rotating shaft 2.

[0033] This embodiment describes a 3D printing head for fused deposition modeling. The driving groove includes a plurality of vertical driving grooves 21 and a plurality of spiral driving grooves 22 arranged alternately along the circumference. The vertical driving groove 21 is provided with a stop boss 23 and a guide slope 24. The guide slope 24 is located on the top of the stop boss 23. The top of the vertical driving groove 21 is connected to the top of the previous spiral driving groove 22. The depth of the top of the vertical driving groove 21 is greater than the depth of the spiral driving groove 22. The bottom of the vertical driving groove 21 is connected to the bottom of the next spiral driving groove 22. The connection between the bottom of the vertical driving groove 21 and the bottom of the next spiral driving groove 22 is located at the bottom of the stop boss 23. The depth of the vertical driving groove 21 at the bottom of the stop boss 23 is the same as the depth of the spiral driving groove 22.

[0034] Specifically, in the initial state, the lifting frame 6 is located at the top dead center, and the drive pin 62 is at the top of the vertical drive groove 21. Since the groove depth at the top of the vertical drive groove 21 is greater than the groove depth of the spiral drive groove 22, the drive pin 62, under the elastic force of the drive spring 63, embeds itself into the deeper top of the vertical drive groove 21, forming a lateral limit, and will not slide into the previous spiral drive groove 22 on its own, ensuring that the initial working position is stable and does not shift. When the push rod 12 drives the lifting frame 6 to move downward, the drive pin 62 moves vertically along the vertical drive groove 21. As the drive pin 62 moves downwards, it passes the guide ramp 24 at the top of the abutment boss 23. The guide ramp 24 provides a smooth radial guide for the drive pin 62, allowing it to smoothly transition and continue downwards to the bottom of the vertical drive groove 21. During this process, the drive pin 62 moves along a purely vertical path and does not apply a circumferential force to the rotating shaft 2, thus keeping the rotating shaft 2 and the rotating disk 3 stationary. When the push rod 12 drives the lifting frame 6 to move upwards, the drive pin 62 moves vertically upwards along the vertical drive groove 21, reaching the bottom position of the abutment boss 23. Due to the vertical obstruction of the blocking boss 23, the drive pin 62 cannot continue to move vertically. Under the combined action of the continuous lifting force of the lifting frame 6 and the radial thrust of the drive spring 63, the drive pin 62 enters the next spiral drive groove 22 from the connection point at the bottom of the blocking boss 23. As the lifting frame 6 continues to move upward, the drive pin 62 moves upward along the oblique trajectory of the spiral drive groove 22. The side wall of the spiral drive groove 22 generates a circumferential reaction force on the drive pin 62, thereby driving the rotating shaft 2 and the rotating disk 3 to rotate synchronously. The indexing angle; when the drive pin 62 moves to the top of the spiral drive groove 22, it just enters the top of the next vertical drive groove 21, completing a precise station switch, and the nozzle 4 on the rotating disk 3 synchronously flows to the next corresponding station; since the depth of the vertical drive groove 21 at the bottom of the abutment boss 23 is the same as the depth of the spiral drive groove 22, the drive pin 62 smoothly enters the spiral drive groove 22 without jamming when it changes direction; the depth difference at the top of the vertical drive groove 21 forms an anti-misoperation limit to prevent the drive pin 62 from mistakenly entering the adjacent spiral groove in the opposite direction.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A 3D printing head for fused deposition modeling, characterized in that: Includes a bracket (1); the bottom of the bracket (1) is rotatably provided with a rotating shaft (2); the bottom of the rotating shaft (2) is fixedly provided with a rotating disk (3); the rotating shaft (2) and the rotating disk (3) are coaxially arranged; the bottom of the rotating disk (3) is provided with multiple nozzles (4) arranged in a circumferential direction; The support (1) is provided with a preheating mechanism, a feeding mechanism and a waste discharge mechanism in sequence along the circumference of the rotating disk (3).

2. The 3D printing head for fused deposition modeling according to claim 1, characterized in that: The nozzle (4) is provided with a flow channel (41); the top of the rotating disk (3) is provided with a sealing ring (31); the sealing ring (31) is provided with a receiving groove (32) that communicates with the top of the flow channel (41).

3. A 3D printing head for fused deposition modeling according to claim 2, characterized in that: The feeding mechanism includes a feeding frame (5) mounted on a support (1), a heat-conducting shell (51) mounted on the feeding frame (5), a feeding channel (52) mounted inside the heat-conducting shell (51), a feeding screw (53) rotating in the feeding channel (52), and a motor (54) mounted on the feeding frame (5); the output end of the motor (54) is connected to the feeding screw (53); the feeding frame (5) is provided with a connection to the top of the feeding channel (52). The feed inlet (55) is provided with a feed port (56) communicating with the feed inlet (55); the heat-conducting shell (51) is provided with a first heating element (57); the bottom of the heat-conducting shell (51) is provided with a discharge port (58) communicating with the bottom of the feeding channel (52); the discharge port (58) is located at the top of the receiving groove (32); the feeding channel (52) and the feeding screw (53) are both extended along the height direction.

4. A 3D printing head for fused deposition modeling according to claim 2, characterized in that: The bottom of the support (1) is provided with a lifting frame (6); the lifting frame (6) is located on the top of the sealing ring (31); the preheating mechanism and the waste discharge mechanism are respectively located at both ends of the lifting frame (6) along the diameter direction of the rotating disk (3).

5. A 3D printing head for fused deposition modeling according to claim 4, characterized in that: The preheating mechanism includes a heat-conducting block (71) located at one end of the lifting frame (6) and a second heating element (72) located within the heat-conducting block (71).

6. A 3D printing head for fused deposition modeling according to claim 4, characterized in that: The waste discharge mechanism includes a material pulling pin (8) located at the other end of the lifting frame (6); the material pulling pin (8) is provided with a push-out channel (81); the push-out channel (81) is provided with a push rod (82) that is movably raised and lowered; a top block (83) is provided at the top of the push rod (82); a return spring (84) is provided between the bottom of the top block (83) and the push-out channel (81); and a top plate (11) is provided at the bottom of the bracket (1) for abutting against the top of the top block (83).

7. A 3D printing head for fused deposition modeling according to claim 6, characterized in that: The bottom of the pull pin (8) is provided with a pull frustum (85); the ejection channel (81) is provided through the pull frustum (85).

8. A 3D printing head for fused deposition modeling according to claim 6, characterized in that: The bracket (1) has a waste box (9) at the bottom of the pull pin (8); the waste box (9) has a clearance slot (91) for making way for the receiving groove (32); the bottom of the top rod (82) has an inclined surface (86).

9. A 3D printing head for fused deposition modeling according to claim 4, characterized in that: The lifting frame (6) has a clearance hole (61) in the middle; the clearance hole (61) passes through the outside of the rotating shaft (2); the inner wall of the clearance hole (61) is provided with a drive pin (62) that can be extended and retracted; a drive spring (63) is provided between the drive pin (62) and the inner wall of the clearance hole (61); the bracket (1) is provided with a push rod (12); the output end of the push rod (12) is connected to the lifting frame (6); the outer wall of the rotating shaft (2) is provided with a drive groove; the drive pin (62) is movably provided in the drive groove.

10. A 3D printing head for fused deposition modeling according to claim 9, characterized in that: The drive groove includes a plurality of vertical drive grooves (21) and a plurality of spiral drive grooves (22) arranged alternately along the circumference; the vertical drive groove (21) is provided with a stop boss (23) and a guide slope (24); the guide slope (24) is located at the top of the stop boss (23); the top of the vertical drive groove (21) is connected to the top of the previous spiral drive groove (22); the depth of the top of the vertical drive groove (21) is greater than the depth of the spiral drive groove (22); the vertical drive groove (21) is connected to the bottom of the next spiral drive groove (22); the connection between the bottom of the vertical drive groove (21) and the bottom of the next spiral drive groove (22) is located at the bottom of the stop boss (23); the depth of the vertical drive groove (21) at the bottom of the stop boss (23) is the same as the depth of the spiral drive groove (22).

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