3D printing head assembly and 3D printer

Abstract

The utility model discloses a 3D printing head assembly and a 3D printer, and relates to the technical field of printers, the 3D printing head assembly comprises a printing head body, a nozzle, an extrusion mechanism and a cutting mechanism, the cutting mechanism comprises a cutting groove, a rotating rod and a cutting knife, one end of the rotating rod is rotationally arranged on the printing head body, and the rotating rod can rotate in the direction close to or away from the cutting groove; the cutting knife is arranged on the side, facing the cutting groove, of the rotating rod, and when the rotating rod rotates in the direction close to the cutting groove, the blade part of the cutting knife can stretch into the cutting groove and extend into the feeding channel so as to cut off the wire in the feeding channel. By the adoption of the technical scheme, the wire can be drawn back without passing through the extrusion mechanism when the wire is replaced, the wire unloading process is simplified, the distance between the extrusion mechanism and the nozzle is shortened, the size of the printing head is reduced, meanwhile, the extrusion precision and the response speed of the extrusion mechanism are improved, and the printing quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, and in particular to a 3D printing head assembly and a 3D printer. Background Art

[0002] FDM (Fused Deposition Modeling) is a common 3D printing technology, which belongs to the fused deposition modeling technology. FDM technology heats and melts thermoplastic materials (such as ABS, PLA, etc.), and then deposits the materials layer by layer to build three-dimensional objects. This technology is widely used in prototyping, education, manufacturing and personal enthusiasts because of its relative simplicity, low cost and easy operation.

[0003] When replacing the printing wire, the 3D printer first needs to withdraw the wire from the print head. Since the wire near the end of the print head has been heated to a molten state, if this part of the wire in a fluid state is withdrawn, it may infiltrate other parts of the print head, thus affecting the normal operation of the print head. Therefore, the wire needs to be cut before withdrawing to ensure that only the fixed part of the upper part of the wire is withdrawn.

[0004] In the prior art, there has been a print head assembly capable of cutting wires, which mainly includes a print head, a nozzle, an extrusion mechanism and a cutting mechanism. A channel is formed inside the print head to allow the wire to pass through. The nozzle is located below the print head and is connected to the channel. The extrusion mechanism includes two extruder gears located on both sides of the channel for conveying the wire in the channel to the nozzle. The cutting mechanism is located between the extrusion mechanism and the nozzle for cutting the wire in the channel so that the molten wire in the nozzle will not be drawn back.

[0005] However, in the prior art, the cutting mechanism of the print head assembly is arranged between the extrusion mechanism and the nozzle. Although it can prevent the molten wire from being drawn back during the material changing process, since the cutting point is below the extrusion mechanism, when drawing back the wire, the extrusion mechanism needs to work and convey the wire to the top of the extruder gear, that is, the wire can only be drawn back after the end of the wire is separated from the extruder gear. The extruder gear is prone to blockage, planing, slipping, etc. when conveying the printing wire, which leads to failure of wire unloading and affects the normal use of the 3D printer. Utility Model Content

[0006] The purpose of the utility model is to address the defects and shortcomings of the print head assembly in the prior art. The utility model provides a 3D print head assembly and a 3D printer, which have the advantages of not having to pass through the extruder gear when the wire is withdrawn, simplifying the wire unloading process, and ensuring the normal use of the 3D printer.

[0007] The technical solution adopted by a 3D printing head assembly provided by the utility model is:

[0008] A 3D printing head assembly, comprising:

[0009] A print head body, wherein the inside of the print head body has a feed channel for the wire to pass through, and the two ends of the feed channel are a feed end and a discharge end respectively;

[0010] A nozzle, disposed on the print head body, communicated with the discharge end of the feed channel, and used for receiving the wire material delivered from the discharge end of the feed channel;

[0011] An extrusion mechanism is disposed in the print head body, between the feed end and the discharge end of the feed channel, and is used to transport the wire in the feed channel to the nozzle; and

[0012] The cutting mechanism is provided on the print head body and located above the extrusion mechanism, and is used to cut off the wire in the feed channel, and includes:

[0013] A cutting groove is formed on the print head body, is located at the feed end of the feed channel, and is communicated with the feed channel;

[0014] A rotating rod, located above the extrusion mechanism, one end of which is rotatably mounted on the print head body, and the rotating rod can rotate toward or away from the cutting groove; and

[0015] The cutting knife is arranged on the side of the rotating rod facing the cutting groove, and when the rotating rod rotates in the direction close to the cutting groove, the blade of the cutting knife can extend into the cutting groove and extend into the inside of the feeding channel to cut the wire in the feeding channel.

[0016] Preferably, the plane where the cutting knife is located is perpendicular to the length direction of the feed channel.

[0017] Preferably, a protrusion is provided on the rotating rod, a groove is provided on the print head for matching with the protrusion, the cutting groove is located in the groove, and the cutting knife is provided on the side where the protrusion extends into the groove, and when the rotating rod is driven to rotate in a direction close to the cutting groove, the blade of the cutting knife extends into the feed channel and transversely blocks the feed channel to cut off the wire in the feed channel.

[0018] Preferably, the print head body is provided with an elastic member for providing elastic force to the rotating rod, so that the rotating rod rotates in a direction close to the cutting groove and can automatically reset after the wire in the feeding channel is cut by the cutting knife.

[0019] Preferably, the elastic member includes a spring groove opened on the print head body, a positioning column arranged on the rotating rod, and a spring arranged between the spring groove and the positioning column, the spring groove is arranged along a length direction perpendicular to the feed channel, the positioning column is arranged between the cutting knife and the free end of the rotating rod, one end of the spring is located in the spring groove and abuts against the bottom wall of the spring groove, and the other end of the spring extends upward to the outside of the positioning column and abuts against the positioning column or the rotating rod.

[0020] Preferably, the extrusion mechanism comprises:

[0021] A first extruder gear is rotatably disposed on one side of the feed channel;

[0022] a second extruder gear, rotatably disposed on the other side of the feed channel and disposed opposite to the first extruder gear, and

[0023] The driving member is arranged in the print head body, and its output end is connected to the first extruder gear or the second extruder gear, so that the first extruder gear and the second extruder gear can cooperate to transport the wire in the feed channel to the nozzle.

[0024] Preferably, the nozzle comprises a heating portion and a nozzle portion, the heating portion is used to heat the wire material to a molten state, and the nozzle portion is used to extrude the wire material heated to a molten state by the heating portion.

[0025] Preferably, the print head body is also provided with a heat dissipation mechanism, and the heat dissipation mechanism comprises:

[0026] A heat sink is provided on the print head body;

[0027] A throat, which is disposed on the heat sink and is located between the extrusion mechanism and the heating portion of the nozzle, and the throat is provided with a through hole for the wire to pass through, so that the wire passes through the through hole inside the throat and then enters the heating portion of the nozzle; and

[0028] A plurality of heat sinks are arranged on the heat sink seat, and heat sink gaps are formed between adjacent heat sinks.

[0029] Preferably, the plurality of heat sinks are divided into a plurality of first heat sinks and a plurality of second heat sinks, one ends of the plurality of first heat sinks are fixedly connected to the side wall of the throat, the plurality of second heat sinks are spaced apart above the first heat sink, and the plurality of second heat sinks cooperate to form a circular arc curve at one end facing the extrusion mechanism.

[0030] The utility model also provides a 3D printer, comprising a printer body and the 3D print head assembly as described above, wherein the 3D print head assembly can move in three axes relative to the printer body, and an abutment block for abutting and cooperating with a rotating rod is arranged on the printer body.

[0031] After adopting the above technical solution, the beneficial effects of the utility model are:

[0032] 1. The present application drives the rotating rod to rotate in the direction close to the cutting groove, so that the cutting knife can extend into the cutting groove and extend into the feed channel, thereby cutting off the wire in the feed channel, so that when the material is changed and printed, the wire in the molten state in the nozzle will not be drawn back, thereby ensuring the normal operation of the entire 3D printer. At the same time, the present application arranges the cutting mechanism above the extrusion mechanism, so that when the cut wire is drawn back, it does not need to pass through the extrusion mechanism, which simplifies the unloading process of the wire, avoids the failure of the extrusion mechanism to unload the wire due to material blocking, planing, slipping, etc., and ensures the normal progress of the material change printing, that is, the normal operation of the 3D printer is ensured;

[0033] 2. The present application can effectively reduce the distance between the extrusion mechanism and the nozzle by arranging the cutting mechanism above the extrusion mechanism, that is, the wire only needs to move a shorter distance to enter the nozzle. On the one hand, the volume of the print head body is reduced, and on the other hand, the extrusion accuracy and response speed of the extrusion mechanism can be improved. It is more suitable for flexible printing wires, that is, a shorter extrusion distance can reduce the elastic deformation of the flexible printing wire during extrusion, thereby achieving the effect of improving the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 It is a schematic diagram of the overall structure of this embodiment;

[0036] Figure 2 is a partial cross-sectional view of this embodiment;

[0037] Figure 3 yes Figure 2 A magnified view of part A;

[0038] Figure 4 This is another perspective view of this embodiment;

[0039] Figure 5 It is a schematic diagram used to reflect the matching relationship between the printer body, the abutment block, the print head body and the rotating rod.

[0040] Explanation of the accompanying drawings: 1. Print head body; 11. Feed channel; 12. Wire; 13. Groove; 2. Nozzle; 21. Heating part; 22. Nozzle part; 3. Extrusion mechanism; 31. First extruder gear; 32. Second extruder gear; 4. Cutting mechanism; 41. Cutting groove; 42. Rotating rod; 421. Protrusion; 43. Cutting knife; 5. Elastic member; 51. Spring groove; 52. Spring; 53. Positioning column; 6. Adjustment mechanism; 61. Adjustment block; 62. Pull part; 63. Adjustment spring; 7. Heat dissipation mechanism; 71. Heat dissipation seat; 72. Throat; 73. Heat sink; 731. First heat sink; 732. Second heat sink; 100. Printer body; 101. Abutment block. DETAILED DESCRIPTION

[0041] The following will be combined with the attached embodiment of the present utility model Figure 1-5 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] It should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "back", "side", "circumferential" and the like in the present invention indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In addition, the words "first", "second" and the like are only used to distinguish multiple components or structures with the same or similar structures, and do not represent any special limitation on the setting order or connection relationship.

[0043] This embodiment relates to a 3D printing head assembly, referring to Figure 1 and Figure 2 , comprising a print head body 1, a nozzle 2, an extrusion mechanism 3 and a cutting mechanism 4, wherein the print head body 1 has a feed channel 11 for a wire 12 to pass through, and the two ends of the feed channel 11 are a feed end and a discharge end, respectively, and the feed end of the feed channel 11 is connected with a wire 12 delivery pipe, that is, the wire 12 can be delivered to the feed channel 11 in the print head body 1 through the wire 12 delivery pipe. The nozzle 2 is provided on the print head body 1, and the nozzle 2 is connected with the discharge end of the feed channel 11 to receive the wire 12 delivered from the discharge end of the feed channel 11.

[0044] The extrusion mechanism 3 is disposed in the print head body 1 , and is located between the feed end and the discharge end of the feed channel 11 , so that the wire 12 in the feed channel 11 is transported to the nozzle 2 through the extrusion mechanism 3 .

[0045] The cutting mechanism 4 is disposed on the print head body 1 . The cutting mechanism 4 is located above the extrusion mechanism 3 . The cutting mechanism 4 is used to cut off the wire 12 in the feeding channel 11 .

[0046] Specifically, refer to Figure 2 and Figure 3 The cutting mechanism 4 includes a cutting groove 41 opened on the print head body 1, a rotating rod 42 rotatably arranged on the print head body 1, and a cutting knife 43 for cutting the wire 12 in the feed channel 11, wherein the cutting groove 41 is located at the feed end of the feed channel 11 and is connected to the feed channel 11, the rotating rod 42 is arranged along a length direction perpendicular to the feed channel 11, one end of the rotating rod 42 is rotatably arranged above the extrusion mechanism 3, and the rotating rod 42 can be rotated in a direction close to or away from the cutting groove 41, the cutting knife 43 is arranged on a side of the rotating rod 42 facing the cutting groove 41, and when the rotating rod 42 is rotated in a direction close to the cutting groove 41, the blade of the cutting knife 43 can extend into the cutting groove 41 and extend to the inside of the feed channel 11, thereby cutting off the wire 12 in the feed channel 11.

[0047] It is understandable that when the wire 12 is changed, the rotating rod 42 is driven to rotate in the direction close to the cutting groove 41, so that the cutting knife 43 can cut the wire 12 in the feed channel 11. Since the cutting point is above the extrusion mechanism 3, the wire 12 after being cut does not need to pass through the extrusion mechanism 3 when it is withdrawn, thereby simplifying the process of unloading (withdrawing) the wire 12, avoiding the failure of the extrusion mechanism 3 to unload the wire 12 due to blocking, planing, slipping, etc., ensuring the normal progress of the change of material printing, that is, ensuring the normal operation of the 3D printer. In addition, the cutting mechanism 4 is arranged above the extrusion mechanism 3, which can effectively reduce the distance between the extrusion mechanism 3 and the nozzle 2, that is, the wire 12 only needs to move a shorter distance to enter the nozzle 2, which can reduce the volume of the print head body 1 on the one hand, and improve the extrusion mechanism 3. The extrusion precision and response speed, and are more suitable for flexible printing wire 12, that is, the shorter extrusion distance can reduce the elastic deformation of the flexible printing wire 12 during extrusion, thereby improving the printing quality.

[0048] Furthermore, the plane where the cutting blade 43 is located is perpendicular to the length direction of the feed channel 11. That is, the cutting blade 43 can cut the wire 12 transversely along the length direction perpendicular to the feed channel 11, thereby ensuring the cutting effect on the wire 12.

[0049] Furthermore, a protrusion 421 is provided on the rotating rod 42, and a groove 13 matched with the protrusion 421 is opened on the print head. The cutting groove 41 is located in the groove 13, and the cutting groove 41 is connected with the groove 13. The cutting knife 43 is arranged on the side where the protrusion 421 extends into the groove 13, and when the rotating rod 42 is driven to rotate in a direction close to the cutting groove 41, the blade of the cutting knife 43 extends into the feed channel 11 and transversely blocks the feed channel 11 to cut off the wire 12 in the feed channel 11.

[0050] It should be noted that, in this embodiment, the rotating rod 42 has an initial state and a cutting state. In the initial state, the protrusion 421 of the rotating rod 42 is located in the groove 13, and the blade of the cutting knife 43 is located in the cutting groove 41 and extends into the feeding channel 11. At this time, there is a gap between the blade of the cutting knife 43 and the wire 12 in the channel, so that the wire 12 can move normally in the feeding channel 11, that is, at this time, the wire 12 can be normally transported to the nozzle 2. When the rotating rod 42 is driven to rotate in the direction close to the cutting groove 41, the cutting knife 43 is driven to move, so that the cutting knife 43 horizontally blocks the feeding channel 11, thereby cutting off the wire 12 in the feeding channel 11, and the rotating rod 42 is switched from the initial state to the cutting state.

[0051] Furthermore, the print head body 1 is provided with an elastic member 5 for providing elastic force to the rotating rod 42 so that the rotating rod 42 rotates in a direction close to the cutting groove 41 and can automatically reset after the wire 12 in the feed channel 11 is cut off by the cutting knife 43, that is, the elastic member 5 can automatically reset the rotating rod 42 from the switching state to the initial state.

[0052] Specifically, the elastic member 5 includes a spring groove 51 opened on the print head body 1, a positioning column 53 arranged on the rotating rod 42, and a spring 52 arranged between the spring groove 51 and the positioning column 53, wherein the spring groove 51 is arranged along a length direction perpendicular to the feed channel 11, the positioning column 53 is arranged between the cutting knife 43 and the free end of the rotating rod 42, one end of the spring 52 is located in the spring groove 51 and abuts against the bottom wall of the spring groove 51, and the other end of the spring 52 extends upward to the outside of the positioning column 53 and abuts against the positioning column 53 or the rotating rod 42.

[0053] When the cutting knife 43 cuts off the wire 12 in the feed channel 11, that is, the rotating rod 42 is in the cutting state, the spring 52 is in a compressed state. When the external force driving the rotating rod 42 to rotate disappears, the spring 52 provides elastic force to the rotating rod 42, so that the rotating rod 42 rotates away from the cutting groove 41, thereby restoring the rotating rod 42 from the cutting state to the initial state for the next cutting.

[0054] Further, refer to Figure 2 and Figure 4The extrusion mechanism 3 includes a first extruder gear 31 and a second extruder gear 32 rotatably arranged in the print head body 1 and a driving member for driving the first extruder gear 31 and the second extruder gear 32 to rotate, wherein the first extruder gear 31 is rotatably arranged on one side of the feed channel 11, and the second extruder gear 32 is rotatably arranged on the other side of the feed channel 11, the second extruder gear 32 is arranged opposite to the first extruder gear 31, and the first extruder gear 31 and the second extruder gear 32 cooperate to convey the wire 12, and the driving member (not shown in the figure) is arranged in the print head body 1, and its output end is connected to the first extruder gear 31 or the second extruder gear 32 to drive the first extruder gear 31 or the second extruder gear 32 to rotate, thereby realizing the conveying of the wire 12.

[0055] In addition, in the present embodiment, an adjustment mechanism 6 for adjusting the distance between the first extruder gear 31 and the second extruder gear 32 is further provided in the print head body 1. The gap between the first extruder gear 31 and the second extruder gear 32 can be adjusted by the adjustment mechanism 6 to achieve stable transportation of the wire 12. At the same time, the gap between the first extruder gear 31 and the second extruder gear 32 can be adjusted accordingly according to the different diameters of the various wires 12.

[0056] Specifically, the adjustment mechanism 6 includes an adjustment block 61 rotatably disposed in the print head body 1, a pull portion 62 disposed on the rotating block, and an adjustment spring 63 disposed between the adjustment block 61 and the side wall of the extruder body. One end of the adjustment block 61 is rotatably connected to the print head body 1 through a hinge column, and the first extruder gear 31 is rotatably disposed on the side of the adjustment block 61 away from the hinge column. The adjustment spring 63 is disposed along a length direction perpendicular to the feed channel 11, and the two ends of the adjustment spring 63 are respectively pressed against the adjustment block 61 and the side wall of the extruder. In addition, an adjustment portion is also disposed on the adjustment block 61, and the adjustment portion is located on the side of the adjustment block 61 close to the hinge column, and the end of the adjustment portion away from the adjustment block 61 extends out of the print head body 1.

[0057] It can be understood that the adjusting block 61 is driven to rotate by the adjusting portion, so that the side of the adjusting portion away from the hinge column moves toward or away from the second extruder gear 32, thereby driving the first extruder gear 31 to move toward or away from the second extruder gear 32, thereby adjusting the gap between the first extruder gear 31 and the second extruder gear 32. In addition, a fixing member for fixing the rotating block can also be provided in the print head body 1 to keep the gap between the first extruder gear 31 and the second extruder gear 32 stable.

[0058] Furthermore, the nozzle 2 includes a heating portion 21 and a nozzle 2 portion, the heating portion 21 is used to heat the wire 12 to a molten state, and the nozzle 2 portion is used to extrude the wire 12 heated to a molten state by the heating portion 21 .

[0059] Furthermore, in order to ensure the normal operation of the 3D printer, a heat dissipation mechanism 7 is also provided on the print head body 1 .

[0060] Specifically, the heat dissipation mechanism 7 includes a heat dissipation seat 71, a throat 72, and a plurality of heat dissipation fins 73, wherein the heat dissipation seat 71 is disposed in the print head body 1, the throat 72 is disposed on the heat dissipation seat 71, the throat 72 is located between the extrusion mechanism 3 and the heating portion 21 of the nozzle 2, and a through hole for the wire 12 to pass through is disposed inside the throat 72, so that the wire 12 passes through the through hole inside the throat 72 and then enters the heating portion 21 of the nozzle 2. A plurality of heat dissipation fins 73 are disposed on the heat dissipation seat 71, and a heat dissipation gap is formed between adjacent heat dissipation fins 73.

[0061] It is worth noting that, in the present embodiment, the heat sink 71, the throat 72 and the heat sink 73 are all made of metal with good thermal conductivity, and the heat sink 71, the throat 72 and the heat sink 73 are all integrally formed.

[0062] Furthermore, the plurality of heat sinks 73 are divided into a plurality of first heat sinks 731 and a plurality of second heat sinks 732, one ends of the plurality of first heat sinks 731 are fixedly connected to the side wall of the throat 72, the plurality of second heat sinks 732 are spaced apart on a side of the first heat sink 731 close to the extrusion mechanism 3, and the plurality of second heat sinks 732 cooperate to form an arc curve toward one end of the extrusion mechanism 3.

[0063] It can be understood that through the above settings, the heat dissipation effect is improved, so that the printer can work stably.

[0064] In addition, refer to Figure 5 The present embodiment further provides a 3D printer, which includes a printer body 100 and the 3D print head assembly as described above, the 3D print head assembly can move in three axes relative to the printer body 100, and the printer body 100 is provided with an abutment block 101 for abutting and cooperating with the rotating rod 42. That is, when the wire 12 needs to be replaced, the 3D print head assembly is driven to move in three axes relative to the printer body 100, and the rotating rod 42 is abutted against the abutment block 101, so that the rotating rod 42 is subjected to force and moves in a direction close to the cutting groove 41, so that the cutting knife 43 can cut the wire 12 in the feeding channel 11.

[0065] The above is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A 3D printing head assembly, characterized in that: include: A print head body (1), having a feed channel (11) inside thereof for allowing a wire (12) to pass through, and two ends of the feed channel (11) are a feed end and a discharge end respectively; A nozzle (2) is provided on the print head body (1), is communicated with the discharge end of the feed channel (11), and is used to receive the wire (12) delivered from the discharge end of the feed channel (11); An extrusion mechanism (3) is arranged in the print head body (1), located between the feed end and the discharge end of the feed channel (11), and is used to transport the wire (12) in the feed channel (11) to the nozzle (2); and A cutting mechanism (4) is provided on the print head body (1) and is located above the extrusion mechanism (3), and is used to cut off the wire material (12) in the feed channel (11), and comprises: A cutting groove (41) is formed on the print head body (1), is located at the feed end of the feed channel (11), and is in communication with the feed channel (11); A rotating rod (42) is located above the extrusion mechanism (3), one end of which is rotatably mounted on the print head body (1), and the rotating rod (42) can rotate in a direction close to or away from the cutting groove (41); and The cutting knife (43) is arranged on a side of the rotating rod (42) facing the cutting groove (41), and when the rotating rod (42) rotates in a direction close to the cutting groove (41), the blade of the cutting knife (43) can extend into the cutting groove (41) and into the inside of the feeding channel (11) to cut the wire (12) in the feeding channel (11).

2. The 3D printing head assembly according to claim 1, characterized in that: The plane where the cutting knife (43) is located is perpendicular to the length direction of the feed channel (11).

3. The 3D printing head assembly according to claim 2, characterized in that: The rotating rod (42) is provided with a protrusion (421), the printing head is provided with a groove (13) for matching with the protrusion (421), the cutting groove (41) is located in the groove (13), the cutting knife (43) is arranged on the side where the protrusion (421) extends into the groove (13), and when the rotating rod (42) is driven to rotate in a direction close to the cutting groove (41), the blade of the cutting knife (43) extends into the feeding channel (11) and horizontally blocks the feeding channel (11) to cut off the wire (12) in the feeding channel (11).

4. The 3D printing head assembly according to claim 3, characterized in that: The print head body (1) is provided with an elastic member (5) for providing elastic force to the rotating rod (42) so that the rotating rod (42) rotates in a direction close to the cutting groove (41) and automatically resets after the wire (12) in the feeding channel (11) is cut by the cutting knife (43).

5. The 3D printing head assembly according to claim 4, characterized in that: The elastic member (5) comprises a spring groove (51) provided on the print head body (1), a positioning column (53) provided on the rotating rod (42), and a spring (52) provided between the spring groove (51) and the positioning column (53), wherein the spring groove (51) is provided along a length direction perpendicular to the feed channel (11), the positioning column (53) is provided between the cutting blade (43) and the free end of the rotating rod (42), one end of the spring (52) is located in the spring groove (51) and abuts against the bottom wall of the spring groove (51), and the other end of the spring (52) extends upward to the outside of the positioning column (53) and abuts against the positioning column (53) or the rotating rod (42).

6. A 3D printing head assembly according to claim 1, characterized in that: The extrusion mechanism (3) comprises: A first extruder gear (31) rotatably disposed on one side of the feed channel (11); a second extruder gear (32) rotatably disposed on the other side of the feed channel (11) and disposed opposite to the first extruder gear (31); and A driving member is arranged in the print head body (1), and its output end is connected to the first extruder gear (31) or the second extruder gear (32), so that the first extruder gear (31) and the second extruder gear (32) can cooperate to transport the wire (12) in the feed channel (11) to the nozzle (2).

7. The 3D printing head assembly according to claim 1, characterized in that: The nozzle (2) comprises a heating portion (21) and a nozzle portion (22), wherein the heating portion (21) is used to heat the wire material (12) to a molten state, and the nozzle portion (22) is used to extrude the wire material (12) heated to a molten state by the heating portion (21).

8. The 3D printing head assembly according to claim 7, characterized in that: The print head body (1) is also provided with a heat dissipation mechanism (7), and the heat dissipation mechanism (7) comprises: A heat sink (71) is disposed on the print head body (1); a throat (72) disposed on the heat sink (71) and located between the extrusion mechanism (3) and the heating portion (21) of the nozzle (2); and a through hole for the wire (12) to pass through is provided inside the throat (72), so that the wire (12) passes through the through hole inside the throat (72) and then enters the heating portion (21) of the nozzle (2); and A plurality of heat sinks (73) are arranged on the heat sink seat (71), and heat sink gaps are formed between adjacent heat sinks (73).

9. The 3D printing head assembly according to claim 8, characterized in that: The plurality of heat sinks (73) are divided into a plurality of first heat sinks (731) and a plurality of second heat sinks (732), one end of each of the plurality of first heat sinks (731) is fixedly connected to the side wall of the throat (72), and the plurality of second heat sinks (732) are arranged above the first heat sink (731) at intervals, and the plurality of second heat sinks (732) cooperate to form an arc curve at one end facing the extrusion mechanism (3).

10. A 3D printer, characterized in that: The invention comprises a printer body (100) and a 3D printing head assembly as described in any one of claims 1 to 9, wherein the 3D printing head assembly can move in three axes relative to the printer body (100), and an abutment block (101) for abutting and cooperating with a rotating rod (42) is provided on the printer body (100).

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