Printing nozzle and 3D printer capable of reducing material residue

Abstract

This application belongs to the field of 3D printing technology and discloses a printing nozzle and a 3D printer that reduce material residue. The printing nozzle includes a feeding mechanism, an ejection mechanism, and an air jet head. The ejection mechanism includes a turntable, two nozzles, and a first driving device. Two connection holes are opened on the top of the turntable, each connection hole communicating with a nozzle. The first driving device is used to drive the turntable to rotate so that one nozzle enters the working position and the other nozzle is aligned with the air jet head. The feeding mechanism includes a rotating frame, multiple feeding devices, and a second driving device. The second driving device is used to drive the rotating frame to rotate so that one of the feeding devices is aligned with the connection hole connected to the nozzle that has entered the working position. The air jet head is used to spray high-pressure gas into the aligned nozzle to blow out residual material from the nozzle. The 3D printer includes this printing nozzle, thereby effectively preventing the nozzle from being blocked by residual material.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and more specifically, to a printhead and 3D printer that reduces material residue. Background Technology

[0002] 3D printing technology is a rapid prototyping technology, also known as additive manufacturing, which is widely used in aerospace, industrial design, medical and dental fields to manufacture models and parts.

[0003] Currently, some 3D printers can use various granular materials with different colors and / or other physical properties to print workpieces, giving different parts of the workpiece different colors and / or other physical properties. These 3D printers typically have multiple hoppers for storing different granular materials. Each hopper is connected to a melting cylinder at its lower end, which contains extrusion blades. A nozzle is connected to the lower end of the melting cylinder. During operation, the granular material enters from the hopper into the melting cylinder, is heated and melted, and is extruded from the nozzle under the pressure of the extrusion blades to print the workpiece. By changing the position of the nozzles, different nozzles are moved to the working position, thereby adding materials with different colors and / or other physical properties to the workpiece.

[0004] In this type of 3D printer, after the nozzle moves from the working station to the non-working station, the nozzle is prone to clogging due to the cooling and solidification of residual material in the nozzle, which affects subsequent printing work. Summary of the Invention

[0005] The purpose of this application is to provide a printhead and 3D printer that reduces material residue and can effectively prevent the nozzle from being clogged by residual material.

[0006] In a first aspect, this application provides a printing nozzle that reduces material residue, including a feeding mechanism, a discharging mechanism, and a jet nozzle;

[0007] The discharge mechanism includes a turntable, two nozzles symmetrically arranged radially at the bottom of the turntable, and a first driving device; the top of the turntable has two connecting holes, each of which communicates with one of the nozzles; the first driving device is used to drive the turntable to rotate so that one of the nozzles enters the working position and the other nozzle is aligned with the jet head;

[0008] The feeding mechanism includes a rotating frame, a plurality of feeding devices evenly arranged circumferentially on the rotating frame, and a second driving device; the second driving device is used to drive the rotating frame to rotate so that one of the feeding devices is aligned with the connecting hole connected to the nozzle entering the working station; the feeding device is used to provide molten material to the nozzle entering the working station.

[0009] The jet head is used to inject high-pressure gas into the aligned nozzle to blow residual material out of the nozzle.

[0010] In use, different raw materials are placed in different feeding devices. Each time the type of raw material is changed, the turntable and rotating frame are rotated to allow the clean nozzle to enter the working position and the feeding device storing the required raw material is aligned with the clean nozzle. This can prevent the new raw material from being contaminated by the material remaining in the nozzle. The nozzle leaving the working position will be aligned with the jet head, and the jet head will spray high-pressure gas to blow out the residual material in the nozzle, making the nozzle clean again. This can prevent the residual material from cooling and solidifying and clogging the nozzle.

[0011] Preferably, each of the connection holes is surrounded by an electromagnet;

[0012] The jet head includes a main body for connecting to an external air supply device, a sliding sleeve that is movably fitted onto the lower end of the main body, a first magnetic suction part fixedly disposed on the outer circumferential surface of the sliding sleeve, and a first return spring; one end of the first return spring is fixedly connected to the main body and the other end is fixedly connected to the sliding sleeve, and the first return spring is used to provide a return force to the sliding sleeve away from the turntable; the main body is provided with an air inlet for communicating with the external air supply device, and the sliding sleeve is provided with a jet nozzle for jetting, and the air inlet communicates with the jet nozzle;

[0013] The electromagnet is used to attract the first magnetic attraction part when aligned with the first magnetic attraction part, so as to fix the sliding part on the corresponding connection hole.

[0014] By using the electromagnet to attract the first magnetic part, the sliding sleeve can be reliably attached to the connecting hole, so that the high-pressure gas ejected from the jet head can reliably blow out the residual material in the nozzle; in addition, when the power supply to the electromagnet is cut off, the sliding sleeve will be reset under the action of the first return spring, so as not to hinder the rotation of the turntable.

[0015] Preferably, the feeding device includes a hopper, a melting cylinder disposed at the lower end of the hopper, extrusion blades inserted into the melting cylinder, a third driving device for driving the extrusion blades to rotate, a sliding cavity portion movably sleeved at the lower end of the melting cylinder, a second magnetic suction portion and a second return spring fixedly disposed on the outer circumferential surface of the sliding cavity portion; the sliding cavity portion has a sliding cavity and a discharge port, and the discharge port and the inner cavity of the melting cylinder are both in communication with the sliding cavity portion; one end of the second return spring is fixedly connected to the melting cylinder, and the other end is fixedly connected to the sliding cavity portion, and the second return spring is used to provide a return force to the sliding cavity portion away from the turntable, so that the lower end of the melting cylinder abuts against the bottom wall of the sliding cavity and blocks the discharge port;

[0016] The electromagnet is also used to attract the second magnetic attraction part when aligning it, so as to fix the sliding cavity part on the corresponding connection hole.

[0017] The attraction of the electromagnet to the second magnetic attraction part ensures that the sliding cavity part is reliably attached to the connecting hole, so that the molten material can be reliably ejected from the nozzle. In addition, when the power supply to the electromagnet is cut off, the sliding cavity part will be reset under the action of the second return spring, so as not to hinder the rotation of the turntable and the rotating frame.

[0018] Preferably, the upper part of the connecting hole is a truncated cone shape, wider at the top and narrower at the bottom, and the lower end of the sliding sleeve and the lower end of the sliding cavity are adapted to the upper part of the connecting hole.

[0019] Preferably, the lower part of the sliding cavity is a truncated cone shape with a larger upper part and a smaller lower part, and the lower end of the melting cylinder is provided with a truncated cone body adapted to the lower part of the sliding cavity. The lower part of the melting cylinder is provided with a connecting hole in the radial direction, which connects the inner cavity of the melting cylinder and the sliding cavity.

[0020] Preferably, the discharge mechanism further includes a support ring, which includes an annular base plate and an annular side plate. The annular base plate and the annular side plate form an installation cavity. The turntable is rotatably disposed in the installation cavity. The circumferential surface of the turntable is slidably connected to the inner circumferential surface of the annular side plate, and the bottom edge of the turntable is slidably connected to the top of the annular base plate.

[0021] Preferably, the upper part of the turntable protrudes above the annular side plate, and the portion above the annular side plate is provided with gear teeth. The first driving device includes a first motor and a first gear. The first motor drives the first gear to rotate, and the first gear meshes with the gear teeth.

[0022] Preferably, the printhead for reducing material residue further includes a collection cup disposed below the turntable and aligned with the nozzle aligned with the printhead, the collection cup being used to store residual material blown out from the nozzle.

[0023] Preferably, the collection cup contains coolant.

[0024] Secondly, this application provides a 3D printer, including a housing, a printing nozzle for reducing material residue as described above, a three-axis moving platform, and an air supply device; the three-axis moving platform is disposed below the printing nozzle for reducing material residue and is used to support the workpiece being printed; the air supply device is connected to the jet nozzle of the printing nozzle for reducing material residue and is used to provide high-pressure gas to the jet nozzle.

[0025] Beneficial effects: The printing nozzle and 3D printer with reduced material residue provided in this application allow different raw materials to be placed in different feeding devices during use. Each time the type of raw material is changed, the turntable and rotating frame are rotated to allow the clean nozzle to enter the working position, and the feeding device storing the required raw material is aligned with the clean nozzle. This can prevent the new raw material from being contaminated by the material residue in the nozzle. The nozzle leaving the working position will be aligned with the jet head, and the jet head will blow out the residual material in the nozzle through the high-pressure gas, so that the nozzle becomes a clean nozzle again, which can prevent the residual material from cooling and solidifying and clogging the nozzle. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a printhead for reducing material residue, provided in an embodiment of this application.

[0027] Figure 2 This is a partial structural diagram of the feeding device and turntable.

[0028] Figure 3 This is a partial structural diagram of the jet head and the rotating disk.

[0029] Figure 4 This is a 3D view of the material discharge mechanism.

[0030] Figure 5 This is a 3D view of the material supply mechanism.

[0031] Figure 6 This is a schematic diagram of the structure of a 3D printer provided in an embodiment of this application.

[0032] Labeling Explanation: 1. Feeding Mechanism; 2. Discharging Mechanism; 3. Jet Head; 301. Main Body; 302. Sliding Sleeve; 303. First Magnetic Suction Part; 304. First Return Spring; 305. Air Inlet; 306. Jet Nozzle; 4. Turntable; 401. Connecting Hole; 402. Electromagnet; 403. Gear Tooth; 5. Nozzle; 6. First Drive Device; 601. First Motor; 602. First Gear; 7. Rotating Frame; 701. Upper Connecting Frame; 702. Lower Connecting Frame; 703. Main Rotating Shaft; 8. Feeding Device; 801. Hopper; 802. Melting Cylinder; 8021. Frustum; 8022. Connecting... 803. Through hole; 804. Extrusion blade; 805. Third drive device; 806. Slide cavity; 807. Slide cavity; 808. Discharge port; 809. Second magnetic suction part; 8000. Second return spring; 9. Second drive device; 10. Support ring; 1001. Circular bottom plate; 1002. Circular side plate; 1003. Rolling connector; 11. Collection cup; 12. First mounting bracket; 13. Second mounting bracket; 100. Housing; 200. Printing nozzle for reducing material residue; 300. Three-axis moving platform; 3001. Support platform; 3002. Three-axis drive device; 400. Air supply device. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Please refer to Figures 1-5 A printing nozzle 200 for reducing material residue in some embodiments of this application includes a feeding mechanism 1, a discharging mechanism 2, and a jet nozzle 3;

[0036] The discharge mechanism 2 includes a turntable 4, two nozzles 5 arranged radially symmetrically at the bottom of the turntable 4, and a first drive device 6. The top of the turntable 4 has two connecting holes 401, each of which communicates with a nozzle 5. The first drive device 6 is used to drive the turntable 4 to rotate so that one nozzle 5 enters the working position and the other nozzle 5 is aligned with the air jet head 3 (in this text, the working position and the cleaning position are two relative positions. When one nozzle 5 is aligned with the air jet head 3, the nozzle 5 is in the cleaning position. At the same time, the other nozzle 5 enters the working position. Thus, the nozzle 5 aligned with the air jet head 3 can also be called the nozzle 5 that enters the cleaning position).

[0037] The feeding mechanism 1 includes a rotating frame 7, a plurality of feeding devices 8 evenly arranged circumferentially on the rotating frame 7, and a second driving device 9; the second driving device 9 is used to drive the rotating frame 7 to rotate so that one of the feeding devices 8 is aligned with the connecting hole 401 connected to the nozzle 5 entering the working position; the feeding device 8 is used to provide molten material to the nozzle 5 entering the working position.

[0038] The jet head 3 is used to spray high-pressure gas into the aligned nozzle 5 to blow out residual material from the nozzle 5.

[0039] In use, different raw materials are placed in different feeding devices 8. Each time the type of raw material is changed, the turntable 4 and the rotating frame 7 are rotated to allow the clean nozzle 5 to enter the working position, and the feeding device 8 storing the required raw material is aligned with the clean nozzle 5. This can prevent the new raw material from being contaminated by the material remaining in the nozzle 5. The nozzle 5 leaving the working position will be aligned with the jet head 3. The jet head 3 sprays high-pressure gas to blow out the residual material in the nozzle 5, making the nozzle 5 clean again. This can prevent the residual material from cooling and solidifying and clogging the nozzle 5.

[0040] The number of feeding devices 8 can be set according to actual needs.

[0041] In some preferred embodiments, see Figures 1-4 Each connection hole 401 is surrounded by an electromagnet 402;

[0042] like Figure 3 As shown, the jet head 3 includes a main body 301 for connecting to an external air supply device, a sliding sleeve 302 that is movably mounted on the lower end of the main body 301, a first magnetic suction part 303 fixedly mounted on the outer peripheral surface of the sliding sleeve 302, and a first return spring 304; one end of the first return spring 304 is fixedly connected to the main body 301, and the other end is fixedly connected to the sliding sleeve 302. The first return spring 304 is used to provide a return force to the sliding sleeve 302 away from the turntable 4; the main body 301 is provided with an air inlet 305 for communicating with the external air supply device, and the sliding sleeve 302 is provided with a jet nozzle 306 for jetting, and the air inlet 305 communicates with the jet nozzle 306;

[0043] The electromagnet 402 is used to attract the first magnetic attraction part 303 when it is aligned with the first magnetic attraction part 303, so as to fix the sliding part 302 on the corresponding connection hole 401.

[0044] By using the attraction of the electromagnet 402 to the first magnetic attraction part 303, the sliding sleeve part 302 can be reliably attached to the connecting hole 401, reducing the gap between the jet head 3 and the connecting hole 401, so that the high-pressure gas ejected from the jet head 3 can reliably blow out the residual material in the nozzle 5; in addition, when the power supply to the electromagnet 402 is cut off, the sliding sleeve part 302 will be reset under the action of the first return spring 304, so as not to hinder the rotation of the turntable 4.

[0045] The first magnetic attraction part 303 can be a ferromagnetic material or a permanent magnet. When the first magnetic attraction part 303 is a permanent magnet, it is arranged with opposite poles to the electromagnet 402.

[0046] The sliding sleeve 302 and the main body 301 are connected by a sliding seal, and a sealing ring can be provided between the sliding sleeve 302 and the main body 301 to ensure airtightness.

[0047] In some preferred embodiments, see Figure 1 , Figure 2 , Figure 5 The feeding device 8 includes a hopper 801, a melting cylinder 802 disposed at the lower end of the hopper 801, an extrusion blade 803 inserted into the melting cylinder 802, a third driving device 804 for driving the extrusion blade 803 to rotate, a sliding cavity 805 movably sleeved on the lower end of the melting cylinder 802, a second magnetic suction part 806 fixedly disposed on the outer peripheral surface of the sliding cavity 805, and a second return spring 807. The sliding cavity 805 has a sliding cavity 8051 and a discharge port 8052. The discharge port 8052 and the inner cavity of the melting cylinder 802 are both connected to the sliding cavity 8051. One end of the second return spring 807 is fixedly connected to the melting cylinder 802, and the other end is fixedly connected to the sliding cavity 805. The second return spring 807 is used to provide a return force to the sliding cavity 805 away from the turntable 4, so that the lower end of the melting cylinder 802 abuts against the bottom wall of the sliding cavity 8051 and blocks the discharge port 8052.

[0048] The electromagnet 402 is also used to attract the second magnetic attraction part 806 when aligning it, so as to fix the sliding cavity part 805 on the corresponding connecting hole 401.

[0049] By using the attraction of the electromagnet 402 to the second magnetic attraction part 806, the sliding cavity part 805 can be reliably attached to the connecting hole 401, reducing the gap between the sliding cavity part 805 and the connecting hole 401, so that the molten material can be reliably ejected from the nozzle 5; in addition, when the power supply to the electromagnet 402 is cut off, the sliding cavity part 805 will be reset under the action of the second return spring 807, so as not to hinder the rotation of the turntable 4 and the rotating frame 7.

[0050] The second magnetic attraction part 806 can be a ferromagnetic material or a permanent magnet. When the second magnetic attraction part 806 is a permanent magnet, it is arranged with opposite poles to the electromagnet 402.

[0051] The sliding cavity 805 and the melting cylinder 802 are connected by a sliding seal, and a sealing ring can be provided between the sliding cavity 805 and the melting cylinder 802 to ensure the sealing performance.

[0052] Among them, the extrusion blade 803 has a blade shaft (such as Figure 2 As shown), the third drive device 804 is connected to the blade shaft. The third drive device 804 may be, but is not limited to, a motor, a rotary cylinder, a rotary pneumatic cylinder, etc.

[0053] The hopper 801 is used to store granular raw materials, and the melting cylinder 802 is used to heat the granular raw materials to a molten state. Heaters are provided on the inner side, outer side and / or side wall of the melting cylinder 802.

[0054] Preferably, see Figures 2-4 The upper part of the connecting hole 401 is a truncated cone shape, wider at the top and narrower at the bottom. The lower ends of the sliding sleeve 302 and the sliding cavity 805 are adapted to the upper part of the connecting hole 401. This shape can further improve the sealing performance between the sliding sleeve 302 and the sliding cavity 805 and the connecting hole 401.

[0055] In order to further improve the sealing performance between the sliding sleeve 302 and the sliding cavity 805 and the connecting hole 401, a sealing gasket can be provided at the upper truncated conical surface of the connecting hole 401, or at the lower truncated conical surface of the sliding sleeve 302 and the sliding cavity 805.

[0056] In some implementations, see Figure 2 The lower part of the sliding cavity 8051 is a truncated cone shape, wider at the top and narrower at the bottom. The lower end of the melting cylinder 802 is provided with a truncated cone 8021 that matches the lower part of the sliding cavity 8051. A radially extending connecting hole 8022 is provided in the lower part of the melting cylinder 802, connecting the inner cavity of the melting cylinder 802 and the sliding cavity 8051. When the sliding cavity 805 is attracted and fixed by the electromagnet 402, the discharge port 8052 opens, allowing the molten material to be extruded into the sliding cavity 8051 under the action of the extrusion blades 803, and then discharged from the discharge port 8052 to the nozzle 5. When the sliding cavity 805 returns to its upward position, the truncated cone 8021 blocks the discharge port 8052, thus preventing the molten material from dripping from the discharge port 8052. The truncated cone 8021, in conjunction with the truncated cone-shaped portion of the lower part of the sliding cavity 8051, reliably blocks the discharge port 8052. The number of connecting holes 8022 can be set according to actual needs.

[0057] Furthermore, see Figures 1-4 The discharge mechanism 2 also includes a support ring 10, which comprises an annular base plate 1001 and an annular side plate 1002. The annular base plate 1001 and the annular side plate 1002 form an installation cavity, in which the turntable 4 is rotatably disposed. The circumferential surface of the turntable 4 is slidably connected to the inner circumferential surface of the annular side plate 1002, and the bottom edge of the turntable 4 is slidably connected to the top of the annular base plate 1001. The height and radial position of the turntable 4 can be fixed by the limiting function of the support ring 10.

[0058] The nozzle 5 protrudes from the inner circular hole of the annular base plate 1001, so that the support ring 10 does not obstruct the operation of the nozzle 5.

[0059] In some embodiments, a rolling connector 1003 is provided on the top of the annular base plate 1001 and the inner circumferential surface of the annular side plate 1002 to reduce friction. The rolling connector 1003 can be a ball or a needle roller.

[0060] Preferably, see Figure 3 , Figure 4The upper part of the circumference of the turntable 4 protrudes above the annular side plate 1002, and the part above the annular side plate 1002 is provided with gear teeth 403. The first driving device 6 includes a first motor 601 and a first gear 602. The first motor 601 drives the first gear 602 to rotate, and the first gear 602 meshes with the gear teeth 403.

[0061] Among them, the lower part of the 4th circumference of the turntable, which is opposite to the inner circumference of the annular side plate 1002, is a smooth arc surface to ensure that the friction is small.

[0062] In some implementations, see Figure 1 The print head 200, which reduces material residue, also includes a collection cup 11. The collection cup 11 is located below the turntable 4 and aligned with the nozzle 5, which is aligned with the print head 3. The collection cup 11 is used to store residual material blown out from the nozzle 5. By storing the blown-out residual material in the collection cup 11, residual material is prevented from scattering throughout the 3D printer and causing contamination, especially from scattering residual material on the workpiece being printed, which could result in defective products.

[0063] Preferably, see Figure 1 The collecting cup 11 contains coolant. This ensures that when molten residue is blown out, it first comes into contact with the coolant and solidifies, preventing the residue from contacting the inner wall of the collecting cup 11 and then solidifying, thus avoiding its adhesion to the inner wall and making it difficult to clean. The coolant can be water or other liquids.

[0064] Furthermore, see Figure 5 The rotating frame 7 includes an upper connecting frame 701, a lower connecting frame 702, and a main rotating shaft 703. Each third driving device 804 is fixedly mounted on the upper connecting frame 701, and each melting cylinder 802 is fixedly mounted on the lower connecting frame 702. The main rotating shaft 703 is fixedly connected to the upper connecting frame 701 and the lower connecting frame 702, and the upper end of the main rotating shaft 703 is connected to the second driving device 9.

[0065] Among them, see Figure 5 Both the upper connecting frame 701 and the lower connecting frame 702 include a first central circular plate and multiple first strips arranged radially along the edge of the first central circular plate. The third driving device 804 is located at the end of the first strip of the upper connecting frame 701, and the melting cylinder 802 is located at the end of the first strip of the lower connecting frame 702. The main rotating shaft 703 is coaxially mounted on the first central circular plates of the upper connecting frame 701 and the lower connecting frame 702, thereby reducing the weight of the rotating frame 7 and reducing the obstruction of the upper connecting frame 701 on the hopper 801, making it easier to add granular raw materials.

[0066] The second drive device 9 may be, but is not limited to, a motor, a rotary hydraulic cylinder, a rotary pneumatic cylinder, etc.

[0067] Furthermore, see Figure 1 , Figure 5 The printhead 200, which reduces material residue, also includes a first mounting bracket 12 for fixed connection with the 3D printer, and a second drive unit 9 is fixed on the first mounting bracket 12.

[0068] In some implementations, see Figure 5 The first mounting frame 12 includes a second central circular plate and multiple second strips arranged radially along the edge of the second central circular plate. The main rotating shaft 703 coaxially passes through the second central circular plate, and the second driving device 9 is fixed to the second central circular plate. This reduces the obstruction of the first mounting frame 12 on the feeding mechanism 1, facilitating the addition of granular raw materials to the hopper 801 through the gaps between the second strips.

[0069] Furthermore, see Figure 1 , Figure 4 The printhead 200, which reduces material residue, also includes a second mounting bracket 13 for fixed connection with the 3D printer. The first drive unit 6, the support ring 10, the collection cup 11 and the jet head 3 are all fixedly connected to the second mounting bracket 13. The collection cup 11 is detachably connected to the second mounting bracket 13 for cleaning the collection cup 11.

[0070] refer to Figure 6 This application also provides a 3D printer, including a housing 100, a printing nozzle 200 for reducing material residue as described above, a three-axis moving platform 300, and an air supply device 400; the three-axis moving platform 300 is disposed below the printing nozzle 200 for reducing material residue and is used to support the workpiece being printed; the air supply device 400 is connected to the jet nozzle 3 of the printing nozzle 200 for reducing material residue and is used to supply high-pressure gas to the jet nozzle 3.

[0071] The three-axis moving platform 300 includes a support platform 3001 and a three-axis drive device 3002. The support platform 3001 is used to support the printed workpiece, and the three-axis drive device 3002 is used to drive the support platform 3001 to move along three axes. The three-axis drive device 3002 is prior art and will not be described in detail here.

[0072] The air supply device 400 may be, but is not limited to, an air compressor, a high-pressure air tank, etc.

[0073] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0074] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A printhead that reduces material residue, characterized in that, It includes a feeding mechanism (1), a discharging mechanism (2), and an air jet head (3); The discharge mechanism (2) includes a turntable (4), two nozzles (5) arranged radially symmetrically at the bottom of the turntable (4), and a first drive device (6); the top of the turntable (4) has two connecting holes (401), each of which communicates with one of the nozzles (5); the first drive device (6) is used to drive the turntable (4) to rotate so that one of the nozzles (5) enters the working position and the other nozzle (5) is aligned with the jet head (3). The feeding mechanism (1) includes a rotating frame (7), a plurality of feeding devices (8) evenly arranged circumferentially on the rotating frame (7), and a second driving device (9); the second driving device (9) is used to drive the rotating frame (7) to rotate so that one of the feeding devices (8) is aligned with the connecting hole (401) connected to the nozzle (5) entering the working station; the feeding device (8) is used to provide molten material to the nozzle (5) entering the working station. The jet head (3) is used to spray high-pressure gas into the aligned nozzle (5) to blow the residual material out of the nozzle (5); Each of the connection holes (401) is surrounded by an electromagnet (402); The jet head (3) includes a main body (301) for connecting to an external air supply device, a sliding sleeve (302) that is movably fitted onto the lower end of the main body (301), a first magnetic suction part (303) fixedly disposed on the outer peripheral surface of the sliding sleeve (302), and a first return spring (304); one end of the first return spring (304) is fixedly connected to the main body (301), and the other end is fixedly connected to the sliding sleeve (302), and the first return spring (304) is used to provide a return force to the sliding sleeve (302) away from the turntable (4); the main body (301) is provided with an air inlet (305) for communicating with the external air supply device, and the sliding sleeve (302) is provided with a jet hole (306) for jetting, and the air inlet (305) communicates with the jet hole (306); The electromagnet (402) is used to attract the first magnetic attraction part (303) when aligned with the first magnetic attraction part (303) so as to fix the sliding part (302) on the corresponding connecting hole (401).

2. The printhead for reducing material residue according to claim 1, characterized in that, The feeding device (8) includes a hopper (801), a melting cylinder (802) disposed at the lower end of the hopper (801), an extrusion blade (803) inserted into the melting cylinder (802), a third driving device (804) for driving the extrusion blade (803) to rotate, a sliding cavity (805) movably sleeved at the lower end of the melting cylinder (802), a second magnetic suction part (806) fixedly disposed on the outer peripheral surface of the sliding cavity (805), and a second return spring (807); the sliding cavity (805) has a sliding cavity (805 1) and discharge port (8052), the discharge port (8052) and the inner cavity of the melting cylinder (802) are both connected to the sliding cavity (8051); one end of the second return spring (807) is fixedly connected to the melting cylinder (802), and the other end is fixedly connected to the sliding cavity (805). The second return spring (807) is used to provide a return force to the sliding cavity (805) away from the turntable (4) so ​​that the lower end of the melting cylinder (802) abuts against the bottom wall of the sliding cavity (8051) and blocks the discharge port (8052). The electromagnet (402) is also used to attract the second magnetic part (806) when aligning it with the second magnetic part (806) so as to fix the sliding cavity part (805) on the corresponding connecting hole (401).

3. The printhead for reducing material residue according to claim 2, characterized in that, The upper part of the connecting hole (401) is a truncated cone shape with a larger upper part and a smaller lower part. The lower end of the sliding sleeve (302) and the lower end of the sliding cavity (805) are adapted to the upper part of the connecting hole (401).

4. The printhead for reducing material residue according to claim 2, characterized in that, The lower part of the sliding cavity (8051) is a truncated cone shape with a larger upper part and a smaller lower part. The lower end of the melting cylinder (802) is provided with a truncated cone (8021) that is adapted to the lower part of the sliding cavity (8051). The lower part of the melting cylinder (802) is provided with a connecting hole (8022) in the radial direction, which connects the inner cavity of the melting cylinder (802) and the sliding cavity (8051).

5. The printhead for reducing material residue according to claim 1, characterized in that, The discharge mechanism (2) further includes a support ring (10), which includes an annular base plate (1001) and an annular side plate (1002). The annular base plate (1001) and the annular side plate (1002) form an installation cavity. The turntable (4) is rotatably disposed in the installation cavity. The circumferential surface of the turntable (4) is slidably connected to the inner circumferential surface of the annular side plate (1002), and the bottom edge of the turntable (4) is slidably connected to the top of the annular base plate (1001).

6. The printhead for reducing material residue according to claim 5, characterized in that, The upper part of the circumference of the turntable (4) protrudes above the annular side plate (1002), and the portion above the annular side plate (1002) is provided with gear teeth (403). The first driving device (6) includes a first motor (601) and a first gear (602). The first motor (601) drives the first gear (602) to rotate, and the first gear (602) meshes with the gear teeth (403).

7. The printhead for reducing material residue according to claim 1, characterized in that, It also includes a collection cup (11) which is located below the turntable (4) and aligned with the nozzle (5) aligned with the jet head (3). The collection cup (11) is used to store residual material blown out from the nozzle (5).

8. The printhead for reducing material residue according to claim 7, characterized in that, The collection cup (11) contains coolant.

9. A 3D printer, characterized in that, The device includes a housing (100), a print head (200) for reducing material residue as described in any one of claims 1-8, a three-axis moving platform (300), and an air supply device (400); the three-axis moving platform (300) is disposed below the print head (200) for reducing material residue and is used to support the workpiece being printed; the air supply device (400) is connected to the jet head (3) of the print head for reducing material residue and is used to supply high-pressure gas to the jet head (3).

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