Printing head of three-dimensional printer and three-dimensional printer

Abstract

Provided in the present application are a printing head of a three-dimensional printer and a three-dimensional printer. The printing head comprises: a material guiding device, comprising at least two feeding openings and one discharging opening, the material guiding device defining at least two feeding channels and one discharging channel, each feeding channel being communicated with one feeding opening, the discharging opening being communicated with the discharging channel, and all of the at least two feeding channels being communicated with the discharging channel; a printer hot end, heating a material wire into a molten-state material, and extruding same, so as to print a three-dimensional model; and an extrusion mechanism, located between the material guiding device and the printer hot end and conveying into the printer hot end a material wire received from the material guiding device. During changing of materials, material wires can directly return to the material guiding device from the extrusion mechanism, thereby shortening the movement distance of the material wires, reducing time for changing materials, and improving the printing efficiency.

Description

Print head of three-dimensional printer and three-dimensional printer

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 25, 2023, with application number 202322307502.6 and application name “A print head for a three-dimensional printer and a three-dimensional printer”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of three-dimensional printing, and in particular to a print head of a three-dimensional printer and a three-dimensional printer. Background Art

[0003] FDM (fused deposition modeling) 3D printing is a technology that uses materials such as powdered metal or plastic to construct three-dimensional objects layer by layer based on digital models. In practice, a 3D printer using FDM technology uses a feed mechanism to deliver hot-melt filament material to a hot end, where it is heated to a molten state. The hot end then extrude the molten material onto the print plate while moving along the printer's print path, printing the 3D object layer by layer.

[0004] For multi-color 3D printing, different colored material lines are repeatedly switched during the printing process. How to shorten the switching time is a technical problem to be solved in this field.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application is proposed to provide a print head for a three-dimensional printer and a three-dimensional printer that overcome the above problems or at least partially solve the above problems.

[0007] In a first aspect of the present application, an embodiment of the present application discloses a print head for a 3D printer, comprising:

[0008] A material guiding device, comprising at least two feed ports and one discharge port, wherein the material guiding device defines at least two feed channels and one discharge channel, wherein each feed channel is in communication with a feed port, the discharge port is in communication with the discharge channel, and the at least two feed channels are in communication with the discharge channel;

[0009] The printer hot end is used to heat the material line into a molten material and extrude the molten material to print the 3D model;

[0010] The extrusion mechanism is located between the material guiding device and the hot end of the printer, and is used to convey the material line received from the material guiding device to the hot end of the printer.

[0011] Optionally, the print head further includes a print head housing, the print head housing includes an opening for the material line to pass through, the extrusion mechanism and the printer hot end are located inside the print head housing, the material guiding device is detachably connected to the outside of the print head housing, and the material outlet faces the opening.

[0012] Optionally, the at least two feed ports include at least three feed ports, and the at least three feed ports are distributed in a polygonal shape, wherein each feed port is a vertex of the polygon.

[0013] Optionally, the at least two feed ports are located at one end of the material guiding device, and the discharge port is located at the other end of the material guiding device.

[0014] Optionally, the material guiding device further includes:

[0015] The feed pipe buckle is arranged on the inner side of the feed port and is used to fix the feed pipe inserted into the feed port in a plane perpendicular to the axial direction of the feed channel.

[0016] Optionally, the material guiding device further includes a buckle plate,

[0017] The portion of the buckle embedded in the inner wall of the feed channel and the portion obliquely abutting the feed pipe inserted into the feed port in the first direction are used to prevent the feed pipe from moving in the second direction along the axial direction of the feed channel, the second direction is toward the feed port, and the first direction is opposite to the second direction.

[0018] Optionally, the material guiding device further includes: a material tube buckle, which is arranged on the inner side of the feed port and is used to fix the feed tube inserted into the feed port in a plane perpendicular to the axial direction of the feed channel. The material tube buckle can move relative to the feed channel in the axial direction of the feed channel. When the material tube buckle moves to a preset position, the material tube buckle abuts against the part of the buckle plate abutting against the feed tube so that the part abutting against the feed tube is separated from the feed tube.

[0019] Optionally, the inner side wall of the feed channel also includes a step structure, which is used to abut one end of the feed pipe inserted into the feed port to prevent the feed pipe inserted into the feed port from moving in a first direction along the axial direction of the feed channel and a second direction toward the feed port, and the first direction is opposite to the second direction.

[0020] Optionally, the material guiding device includes a material guiding device housing, and the material guiding device housing includes a first sub-housing and a second sub-housing.

[0021] The outer side of the first sub-shell is connected to the side surfaces of the at least two feeding pipes in a direction in which they approach each other;

[0022] The inner side of the second sub-shell is connected to the side surfaces of the at least two feeding pipes in a direction away from each other;

[0023] The outer side of the first sub-shell and the inner side of the second sub-shell form the feed channel.

[0024] Optionally, the material guiding device housing further comprises: a third sub-housing,

[0025] The third sub-housing surrounds the second sub-housing and is used to fix the first sub-housing and the second sub-housing.

[0026] Optionally, the material guiding device housing further comprises: a fourth sub-housing,

[0027] The fourth sub-shell is located between the third sub-shell and the material tube buckle, and is used to fix the material tube buckle.

[0028] Optionally, the material tube buckle is a sub-fastener, and a boss is formed on one side of the fourth sub-shell close to the material tube buckle, and the sub-fastener abuts against the boss.

[0029] Optionally, the buckle plate is a metal buckle plate, and the metal buckle plate is provided with a first through hole in the feed channel, and the first through hole is bent toward the first direction, and the formed bent portion serves as the portion abutting against the feed pipe.

[0030] Optionally, the number of the first through holes is at least two, and they correspond one-to-one to the at least two feed channels.

[0031] In the second aspect of the present application, an embodiment of the present application discloses a three-dimensional printer, comprising: a printing platform, a driving device and a print head of the three-dimensional printer as described above, wherein the print head is arranged above the printing platform, and the driving device is used to drive the print head to generate relative displacement with the printing platform.

[0032] The material guiding device of the print head provided in the present application includes at least two feed channels and one discharge channel. When the material line needs to be switched, it is only necessary to retract the material line of the extrusion mechanism to the feed channel. The material line retraction distance is short, which reduces the material changing time and improves the printing efficiency. Moreover, since the material guiding mechanism has only one discharge channel, the related extrusion mechanism and hot end also only need one material line channel. Compared with the extrusion mechanism and hot end with multiple channels, the structural complexity of the print head is reduced, the cost is saved, and the print head is prevented from being too bulky and affecting printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic structural diagram of a 3D printer system according to an embodiment of the present application;

[0034] FIG2 is a schematic structural diagram of a 3D printer system according to an embodiment of the present application;

[0035] FIG3 is a schematic structural diagram of a material guiding device of a print head of a 3D printer according to an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of a print head of a 3D printer according to an embodiment of the present application;

[0037] FIG5 is a cross-sectional view of a material guide device of a print head of a 3D printer according to an embodiment of the present application;

[0038] FIG6 is a partial enlarged view of FIG5;

[0039] FIG7 is a schematic diagram of a material feed port of a material guide device of a print head of a 3D printer according to an embodiment of the present application.

[0040] Explanation of the accompanying drawings: 10-material roll, 20-printing platform, 30-3D printer print head, 1-3D printer; 21-printing panel, 22-hot bed, 23-base, 31-first guide rail, 32-second guide rail, 33-third guide rail; 100-material guiding device, 110-feed channel, 111-feed port, 112-feed pipe, 120-discharge channel, 121-discharge port, 130-material pipe buckle, 140-buckle, 150-material guiding device housing, 151-first sub-housing, 152-second sub-housing, 153-third sub-housing, 154-fourth sub-housing, 160-step structure, 200-printer hot end, 300-extrusion mechanism. DETAILED DESCRIPTION

[0041] The implementation of the technical solution of the present application is further described in detail below with reference to the accompanying drawings.

[0042] 1 and 2 , a schematic structural diagram of a 3D printer system of the present application is shown; the 3D printer system includes: a material roll 10 and a 3D printer 1, the 3D printer includes: a printing platform 20 and a print head 30 of the 3D printer as described above, the material roll 10 is used to provide a material line to the feed end of the 3D printer print head.

[0043] In the embodiment of the present application, there may be multiple material rolls 10, each of which may be wound with a material wire of a different color or material than the other material rolls 10. The print head 30 of the 3D printer is disposed above the printing platform 20. The print head 30 of the 3D printer heats the received wire to form a molten material, and then extrude the molten material onto the printing platform 20 to print a model (printed part).

[0044] Furthermore, the 3D printer's print head 30 includes a material guide 100, a printer hot end 200, and an extrusion mechanism 300 disposed between the material guide 100 and the printer hot end 200. During the feeding process of the material roll 10, the material line passes through the material guide 100 and then enters the extrusion mechanism 300, which then delivers the material line to the printer hot end. During the unloading process of the material roll 10, the 3D printer 1 cuts the material line in the print head, and the extrusion mechanism 300 retracts the material line toward the material roll 10. The loading and unloading components in the material roll 10 then rewind the retracted material line back to the material tray.

[0045] Optionally, the 3D printer 1 can, for example, cut the material line between the extrusion mechanism 300 and the printer hot end, or can cut the material line in the extrusion mechanism 300, etc. This application does not limit the position where the 3D printer cuts the material line.

[0046] Exemplarily, the 3D printer 1 further includes a print panel 21, a heated bed 22, and a base 23. The heated bed 22 is located on the side of the base 23 facing the printer's hot end and has a heating function. The print panel 21 is located on the side of the heated bed 22 facing the printer's hot end. Heat from the heated bed 22 is transferred to the print panel 21, allowing the printer's hot end to extrude molten material strands onto the print panel 21.

[0047] In a specific implementation, the 3D printer 1 can adjust the temperature of the printer hot end and the hot bed 22. The temperature of the printer hot end is adjusted to heat the material line to a molten state, and the temperature of the hot bed 22 is adjusted to adhere the material line extruded from the printer hot end to the print panel 21. The print head 30 of the 3D printer is slidably connected to the first guide rail 31. The print head 30 of the 3D printer can move along the length direction of the first guide rail 31, that is, the print head 30 of the 3D printer is displaced relative to the print panel 21 along the length direction of the first guide rail 31. The hot bed 22 is slidably connected to the second guide rail 32. The hot bed 22 moves along the length direction of the second guide rail 32, that is, the print head 30 of the 3D printer is displaced relative to the print panel 21 along the length direction of the second guide rail 32. The length direction of the second guide rail 32 is perpendicular to the length direction of the first guide rail 31. Furthermore, the first guide rail 31 is slidably connected to the third guide rail 33. By moving the first guide rail 31 along the third guide rail 33, the 3D printer can achieve displacement of the print head 30 relative to the print panel 21 in a direction perpendicular to the length of the second guide rail 32 and a direction perpendicular to the length of the first guide rail 31. In other words, the 3D printer can achieve relative displacement between the print head 30 and the print panel 21 in three mutually perpendicular directions, thereby printing a three-dimensional object.

[0048] Specifically, as shown in FIG1 , FIG3 and FIG4 , the print head 30 of the 3D printer includes:

[0049] The material guiding device 100 includes at least two feed ports 111 and one discharge port 121. The material guiding device 100 defines at least two feed channels 110 and one discharge channel 120, wherein each feed channel 110 is connected to a feed port 111, and the discharge port 121 is connected to the discharge channel 120, and the at least two feed channels 110 are both connected to the discharge channel 120.

[0050] The printer hot end 200 is used to heat the material line into a molten material and extrude the molten material to print a three-dimensional model.

[0051] The extrusion mechanism 300 is located between the material guiding device 100 and the printer hot end 200 and is used to transport the material line received from the material guiding device 100 to the printer hot end 200 .

[0052] 5 and 6 , in the embodiment of the present application, the material guiding device 100 includes at least two feed ports 111 and one discharge port 121, with the feed ports 111 and the discharge port 121 located at opposite ends of the material guiding device 100. The material guiding device 100 includes at least two feed channels 110 and one discharge channel 120, with the discharge channels 120 communicating with the discharge ports 121. The two feed channels 110 are connected to the corresponding feed ports 111. Specifically, the wire material enters the feed channel 110 through the feed port 111 and is finally discharged from the discharge channel 120 through the discharge port 121.

[0053] The extrusion structure is located between the material guide device 100 and the printer hot end 200, receiving the material line delivered from the material guide device 100 and then delivering the material line to the printer hot end 200. As shown in Figure 1, the extrusion structure is directly connected to the material guide device 100 and the printer hot end 200. The extrusion structure can include a set of extrusion wheels arranged on both sides of the material line. The set of extrusion wheels squeezes the material line to generate friction on the material line. As the extrusion wheels rotate, the frictional force causes the material line to approach the printer hot end 200, thereby achieving delivery of the material line to the printer hot end 200. Since there is only one discharge channel 120, the extrusion structure is also single-channel, and the set of extrusion wheels consists of a driving wheel and a driven wheel.

[0054] The printer hot end 200 is connected to the extruder 300 and heats the material line fed by the extruder 300 to form a molten material. The molten material is then extruded to print a 3D model. Since there is only one discharge channel 120, the printer hot end 200 also has a single material line channel. The printer hot end 200 comprises, in order: heat sink fins, a nozzle, a heating block, and a nozzle.

[0055] The material line conveyed by the material guiding device 100 is directly delivered to the hot end 200 of the printer via the extrusion mechanism 300. No additional feed tube 112 is required between the material guiding device 100 and the extrusion mechanism 300. When changing materials, the wire can be directly returned from the extrusion mechanism 300 to the feed channel of the material guiding device 100, shortening the return distance of the material line, reducing the material changing time, reducing the time to complete printing, and improving printing efficiency.

[0056] In an optional implementation of the embodiment of the present application, the print head also includes a print head housing, the print head housing includes an opening for the material line to pass through, the extrusion mechanism 300 and the printer hot end 200 are located in the print head housing, the material guiding device 100 is detachably connected to the outside of the print head housing, and the discharge port 121 faces the opening.

[0057] Optionally, the material guiding device 100 may also be fixed inside the print head housing, and the opening of the housing is the feed port of the material guiding device 100 .

[0058] The print head also includes a print head housing, within which the extrusion mechanism 300 and the printer hot end 200 are located. The print head housing includes the extrusion mechanism 300 and the printer hot end 200, thereby protecting the extrusion mechanism 300 and the printer hot end 200. The material guide device 100 is detachably connected to the outside of the print head housing, facilitating removal and replacement of the material guide device 100. For example, if multi-color printing is not required, the material guide device 100 can be replaced with a single-channel material guide structure, or the material guide device 100 can be directly removed. The print head housing has an opening through which the material line can pass; the material outlet 121 of the material guide device 100 faces the opening, allowing the material line delivered by the material guide device 100 to pass through the opening into the extrusion mechanism 300 and then into the printer hot end 200, thereby printing the model.

[0059] In an optional implementation of the embodiment of the present application, the at least two feed ports 111 include at least three feed ports 111 , and the at least three feed ports 111 are distributed in a polygonal shape, wherein each feed port 111 is a vertex of the polygon.

[0060] The number of feed openings 111 can be at least three, that is, the material guiding device 100 has at least three feed openings 111, and these feed openings 111 are distributed in a polygonal shape, with each feed opening 111 being a vertex of the polygon. This allows the feed openings 111 to be densely distributed on the material guiding device 100. For example, referring to FIG. 7 , the number of feed openings 111 can be four, and the four feed openings 111 are distributed in a rectangular shape, with each feed opening 111 being a vertex of the rectangle.

[0061] In an optional implementation of the embodiment of the present application, the at least two feed ports 111 are located at one end of the material guiding device 100 , and the discharge port 121 is located at the other end of the material guiding device 100 .

[0062] The feed port 111 is located at one end of the material guiding device 100, and the discharge port 121 is located at the other end of the material guiding device 100, so that the feed port 111 and the discharge port 121 can be distributed in the same direction. After the material line enters the material guiding device 100, it will not bend, and the extrusion mechanism 300 can pull the material line with less force.

[0063] In an optional implementation of the embodiment of the present application, the material guiding device 100 further includes:

[0064] The feed tube buckle 130 is disposed on the inner side of the feed port 111 and is used to fix the feed tube 112 inserted into the feed port 111 in a plane perpendicular to the axial direction of the feed channel 110 .

[0065] At least one feed tube clip 130 is provided inside the feed port 111, i.e., on the inner diameter of the feed port 111. The feed tube clip 130 can correspond to a single feed tube 112 or multiple feed tubes 112. The feed tube clip 130 secures the feed tube 112 inserted into the feed port 111 in a plane perpendicular to the axial direction of the feed channel 110, thereby securing the corresponding feed tube 112.

[0066] In an optional implementation of the embodiment of the present application, the material guiding device 100 further includes a buckle 140.

[0067] The portion of the buckle 140 embedded in the inner wall of the feed channel 110 and the portion obliquely abutting the feed pipe 112 inserted into the feed port 111 in the first direction are used to prevent the feed pipe 112 from moving in the second direction along the axial direction of the feed channel 110, the second direction is toward the feed port 111, and the first direction is opposite to the second direction.

[0068] A clip 140 may be provided in the feed channel 110. Part of the clip 140 is embedded in the inner side wall of the feed channel 110, and the other part is inclined in the first direction to abut against the feed tube 112 inserted into the feed port 111. The part of the clip 140 embedded in the inner side wall of the feed channel 110 and the part of the clip 140 inclined in the first direction to abut against the feed tube 112 inserted into the feed port 111 fix the feed tube 112 in the feed port 111 to prevent the feed tube 112 from moving in the second direction along the axial direction of the feed channel 110. The second direction is toward the feed port 111. In the example shown in FIG3 , the second direction is the upward direction; the first direction is opposite to the second direction, that is, the downward direction as shown in FIG3 . The material of the clip 140 may be metal or non-metal or other engineering materials, which is not limited in the embodiments of the present application.

[0069] Furthermore, when the buckle 140 is a metal buckle, the metal buckle is provided with a first through hole in the feed channel 110, the size of the first through hole matches the outer diameter of the feed pipe 112, and the first through hole is bent toward the first direction, and the bent portion formed serves as the portion abutting against the feed pipe 112 to clamp the feed pipe 112.

[0070] Specifically, the number of the first through holes is at least two, and they correspond one-to-one to the at least two feeding channels 110 , that is, one first through hole corresponds to one feeding channel 110 , and only the corresponding feeding pipe 112 is fixed.

[0071] Furthermore, when the clip 140 is provided, that is, one end of the feed tube 112 is fixed, the feed tube buckle 130 can move relative to the feed channel 110 in the axial direction of the feed channel 110. When the feed tube buckle 130 moves to a predetermined position, the feed tube buckle 130 abuts against the portion of the clip 140 abutting the feed tube 112, causing the portion of the clip 140 abutting the feed tube 112 to further tilt in the first direction, thereby allowing the portion of the clip 140 abutting the feed tube 112 to disengage from the feed tube 112, thereby facilitating removal of the feed tube 112 from the feed port 111. The design of the feed tube buckle 130 facilitates removal of the feed tube 112.

[0072] In an optional implementation of an embodiment of the present application, referring to Figure 5, the inner side wall of the feed channel 110 also includes a step structure 160, which is used to abut one end of the feed pipe 112 inserted into the feed port 111 to prevent the feed pipe 112 inserted into the feed port 111 from moving in the first direction along the axial direction of the feed channel 110.

[0073] A step structure surrounding the feed port 111 can be provided on the inner wall of the feed channel 110. The step structure can abut one end of the feed pipe 112 inserted into the feed port 111 to fix the feed pipe 112 and prevent the feed pipe 112 inserted into the feed port 111 from moving axially toward the first direction along the feed channel 110.

[0074] In an optional implementation of the embodiment of the present application, the material guiding device 100 further includes a limiting component, which is arranged between the material tube buckle 130 and the feed port 111 and is used to limit the movement range of the material tube buckle in the axial direction of the feed channel 110.

[0075] In an optional implementation of the embodiment of the present application, the material guiding device 100 includes a material guiding device housing 150, and the material guiding device housing 150 includes a first sub-housing 151 and a second sub-housing 152.

[0076] The outer side of the first sub-shell 151 is connected to the side surfaces of the at least two feeding pipes 112 in the direction in which they approach each other;

[0077] The inner side of the second sub-shell 152 is connected to the side surfaces of the at least two feeding pipes 112 in a direction away from each other;

[0078] The outer side of the first sub-shell 151 and the inner side of the second sub-shell 152 form the feed channel 110 .

[0079] The material guide device 100 includes a material guide device housing 150, which can be composed of a first sub-housing 151 and a second sub-housing 152. The outer side of the first sub-housing 151 is connected to the side surfaces of at least two feed tubes 112 in the direction of approaching each other, that is, the first sub-housing 151 is arranged between the feed tubes 112. The inner side of the second sub-housing 152 is connected to the side surfaces of at least two feed tubes 112 in the direction of moving away from each other, that is, the second sub-housing 152 can be arranged outside the feed tubes 112, surrounding all the feed tubes 112. In this case, from the outside to the inside, the second sub-housing 152, the feed tubes 112, and the first sub-housing 151 are arranged in order. The outer side of the first sub-housing 151 and the inner side of the second sub-housing 152 form the feed channel 110.

[0080] In an optional implementation of the embodiment of the present application, the material guiding device housing 150 further includes: a third sub-housing 153,

[0081] The third sub-housing 153 surrounds the second sub-housing 152 and is used to fix the first sub-housing 151 and the second sub-housing 152 .

[0082] In the embodiment of the present application, the third sub-housing 153 surrounds the second sub-housing 152 and fixes the first sub-housing 151 and the second sub-housing 152 to fix the feed channel 110 and ensure the stable feeding direction. In addition, the edge of the third sub-housing forms the feed port 111.

[0083] In an optional implementation of the embodiment of the present application, the limiting component includes: a fourth sub-housing 154,

[0084] The fourth sub-housing 154 is located between the third sub-housing 153 and the material tube buckle 130 , and is used to limit the movement range of the material tube buckle 130 in the axial direction of the feed channel 110 .

[0085] The material guiding device housing 150 may further include a fourth sub-housing 154 , which is located between the third sub-housing 153 and the material tube buckle 130 and is respectively engaged with the third sub-housing 153 and the material tube buckle 130 to fix the material tube buckle 130 .

[0086] Furthermore, the material tube buckle 130 is a sub-fastener, and a boss is formed on one side of the fourth sub-shell close to the material tube buckle 130 , and the sub-fastener abuts against the boss.

[0087] The material tube buckle 130 is a sub-fastener, that is, the part connecting the fourth sub-shell and the material tube buckle 130 is a female fastener. A boss is formed on one side of the fourth sub-shell close to the material tube buckle 130. The boss is used as a female fastener to resist the sub-fastener to achieve the clamping of the material tube buckle 130, thereby fixing the feed tube 112.

[0088] It should be noted that the above terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

Claims

1. A print head for a 3D printer, characterized in that: include: A material guiding device, comprising at least two feed ports and one discharge port, wherein the material guiding device defines at least two feed channels and one discharge channel, wherein each feed channel is connected to a feed port, the discharge port is connected to the discharge channel, and the at least two feed channels are connected to the discharge channel; The printer hot end is used to heat the material line into a molten material and extrude the molten material to print a three-dimensional model; The extrusion mechanism is located between the material guiding device and the hot end of the printer, and is used for conveying the material line received from the material guiding device to the hot end of the printer.

2. The print head according to claim 1, characterized in that: The print head also includes a print head housing, which includes an opening for the material line to pass through, the extrusion mechanism and the printer hot end are located in the print head housing, the material guiding device is detachably connected to the outside of the print head housing, and the material outlet faces the opening.

3. The print head according to claim 1 or 2, characterized in that: The at least two feed ports include at least three feed ports, and the at least three feed ports are distributed in a polygonal shape, wherein each feed port is a vertex of the polygon.

4. The print head according to any one of claims 1 to 3, characterized in that: The at least two feed ports are located at one end of the material guiding device, and the discharge port is located at the other end of the material guiding device.

5. The print head according to any one of claims 1 to 4, characterized in that: The material guiding device also includes: The feed pipe buckle is arranged on the inner side of the feed port and is used to fix the feed pipe inserted into the feed port in a plane perpendicular to the axial direction of the feed channel.

6. The print head according to any one of claims 1 to 4, characterized in that: The material guiding device further comprises a buckle plate, The buckle piece is embedded in the inner wall of the feed channel and the portion that abuts the feed pipe inserted into the feed port in an oblique first direction, and is used to prevent the feed pipe from moving in a second direction along the axial direction of the feed channel, the second direction is toward the feed port, and the first direction is opposite to the second direction.

7. The print head according to claim 6, characterized in that: The material guiding device also includes: a material tube buckle, which is arranged on the inner side of the feed port and is used to fix the feed tube inserted into the feed port in a plane perpendicular to the axial direction of the feed channel. The material tube buckle can move relative to the feed channel in the axial direction of the feed channel. When the material tube buckle moves to a preset position, the material tube buckle abuts against the part of the buckle sheet abutting against the feed tube so that the part abutting against the feed tube is separated from the feed tube.

8. The print head according to any one of claims 1 to 7, characterized in that: The inner side wall of the feed channel also includes a step structure, which is used to abut one end of a feed pipe inserted into the feed port to prevent the feed pipe inserted into the feed port from moving in a first direction along the axial direction of the feed channel and a second direction toward the feed port, and the first direction is opposite to the second direction.

9. The print head according to any one of claims 6 to 8, characterized in that: The buckle plate is a metal buckle plate, and the metal buckle plate is provided with a first through hole in the feed channel. The first through hole is bent toward the first direction, and the bent portion formed serves as the portion abutting against the feed pipe.

10. The print head according to any one of claims 1 to 9, characterized in that: The number of the first through holes is at least two, and they correspond one-to-one to the at least two feed channels.

11. A three-dimensional printer, characterized in that: include: A printing platform, a driving device and a print head as described in any one of claims 1 to 10, wherein the print head is arranged above the printing platform, and the driving device is used to drive the print head to generate relative displacement with the printing platform.

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