3D printing nozzle with z-direction lifting function and interlayer path strengthening method

Abstract

The application relates to the field of additive manufacturing technology and discloses a 3D printing nozzle with a Z-direction lifting function and an interlayer path strengthening method. The nozzle comprises a wire feeding assembly, a cooling assembly, a heating assembly and a printing nozzle which are sequentially connected from top to bottom, further comprises a liftable bracket and a liftable bracket Z-direction driving assembly, the liftable bracket is located below a three-dimensional moving bracket, the liftable bracket Z-direction driving assembly is arranged on the three-dimensional moving bracket and connected with the liftable bracket, the wire feeding assembly, the cooling assembly, the heating assembly and the printing nozzle are arranged on the liftable bracket, and the liftable bracket Z-direction driving assembly drives the liftable bracket to reciprocate up and down in a vertical plane. The nozzle is greatly moved in the Z direction, so that the curved surface trend of the printing path is realized, and finally the Z-direction enhancement is realized through the structure.

Description

Technical Field

[0001] This application relates to the field of additive manufacturing technology, and more particularly to fused deposition modeling in additive manufacturing. More specifically, it relates to a 3D printing nozzle with Z-axis lifting function and an interlayer path strengthening method. Background Technology

[0002] Fused deposition modeling (FDM) technology utilizes the heat-melting and adhesive properties of thermoplastic materials. Under computer control, a heat source heats and melts the filament, which is then extruded through micro-nozzles at the bottom of the nozzle onto a printing platform. Layers are then deposited and stacked to ultimately form the desired product or model. FDM technology is an important branch of additive manufacturing and is currently widely used in product development, rapid prototyping, medical devices, and aerospace functional components, representing a significant direction for the development of rapid prototyping technology.

[0003] In the FDM deposition process, within each printing layer, the printhead moves horizontally to coat the molten, extruded material onto the worktable along the designed path. Once this layer is coated, the next layer can be started by raising the horizontal support holding the printhead or lowering the worktable plane, repeating this process until printing is complete. Due to the melt-deposition-cooling process characteristics of existing FDM technology, the adhesion between previous and subsequent layers, and between previous and adjacent coating paths, deteriorates due to differences in processing time and material surface temperature. The mechanical properties of the material are significantly affected by the angle between the printing nozzle's coating direction; the material along the nozzle's coating direction exhibits the best mechanical properties, while the material perpendicular to the nozzle's coating direction exhibits the worst mechanical properties. In existing layer-by-layer horizontal printing methods, poor interlayer adhesion and mechanical properties in the Z-direction of the printed part are difficult to avoid. Furthermore, current FDM printheads cannot support more advanced and diverse path printing methods.

[0004] Patent application CN113733562A discloses a 3D printing nozzle and printing method based on ultrasonic micro-forging. The nozzle includes a print head with an internal melting cavity. The upper part of the print head is connected to the lower end of a melting throat. The lower end of the melting throat is connected to a printing heat source. The upper end of the melting throat is connected to a cooling device. The top of the melting throat is connected to the bottom of a transfer bracket. The top of the transfer bracket is connected to a connecting plate. The connecting plate is connected to the lower end of a threaded tube. The upper end of the threaded tube is connected to a two-dimensional module connecting frame. First and second ultrasonic vibration transducers are connected between the two-dimensional module connecting frame and the connecting plate. A wire feeder is located above the top of the threaded tube, which sequentially feeds the wire to the threaded tube, the melting throat, and the melting cavity. This application achieves micro-forging functionality during the printing process, improving melt flowability, increasing melt pressure within the molten wall, and enhancing FDM printing strength, speed, and accuracy.

[0005] The aforementioned existing technologies cannot achieve large-scale movement of the nozzle in the Z-axis. Therefore, the entire 3D printing process cannot adapt well to the curved surface of the printing path, and thus cannot achieve Z-axis reinforcement through structure. Summary of the Invention

[0006] To address the problems and shortcomings of the existing technologies, this application proposes a 3D printing nozzle with Z-axis lifting function and a 3D printing interlayer path strengthening method. By utilizing the large-scale movement of the nozzle in the Z-axis, the curved direction of the printing path is achieved, and finally, Z-axis reinforcement is achieved through the structure.

[0007] To achieve the aforementioned objectives, the technical solution of this application is as follows:

[0008] A 3D printing nozzle with Z-axis lifting function includes, from top to bottom, a three-dimensional moving support 1, a filament feeding assembly 2, a cooling assembly 3, a heating assembly 4, and a printing nozzle 5. The printing filament is fed sequentially into the cooling assembly 3 and the heating assembly 4 by the filament feeding assembly 2, and finally extruded through the printing nozzle 5 after molten material is extruded. The nozzle also includes a liftable support 6 and a liftable support Z-axis driving assembly 7. The liftable support 6 is located below the three-dimensional moving support 1. The filament feeding assembly 2, cooling assembly 3, heating assembly 4, and printing nozzle are also included. 5 is mounted on the liftable support 6. The liftable support Z-axis drive assembly 7 is mounted on the three-dimensional moving support 1 and connected to the liftable support 6. The liftable support Z-axis drive assembly 7 includes a Z-axis drive motor 701, a screw 702 and a screw sleeve 703. The Z-axis drive motor 701 is mounted on the three-dimensional moving support 1, and the screw sleeve 703 is mounted on the liftable support 6. The output end of the Z-axis drive motor 701 is connected to one end of the screw 702, and the other end of the screw 702 is located in the screw sleeve 703.

[0009] Preferably, the system also includes a Z-axis lifting guide assembly 8, which includes a guide post 801 fixed on the liftable bracket 6, and a guide sleeve 9 that cooperates with the guide post 801 on the three-dimensional movable bracket 1.

[0010] Preferably, the wire feeding assembly 2 includes a wire feeding gear 201, which is mounted on a gear bracket 202, which is mounted on a liftable bracket 6.

[0011] Preferably, the cooling component 3 is cooled by air, water, or coolant.

[0012] Preferably, the heating component 4 is provided with a heat-insulating coating or a heat-preserving layer on the outside.

[0013] Preferably, the wire feeding assembly 2, cooling assembly 3, heating assembly 4, and Z-axis drive assembly 7 of the liftable bracket are respectively connected to the industrial control computer.

[0014] A method for enhancing interlayer paths in 3D printing, the method employing the aforementioned 3D printing nozzle, includes the following steps:

[0015] Step S1. Establish a three-dimensional interlayer reinforcement structure model. The model structure consists of a bottom skeleton structure and an upper curved surface structure.

[0016] Step S2. Slice the skeleton structure and surface structure of the three-dimensional interlayer reinforcement structure model respectively to obtain the corresponding slice contour data information;

[0017] Step S3. Based on the slice contour data of the skeleton structure and the curved surface structure, generate the printing paths of the skeleton structure and the curved surface structure according to the printing process requirements, and set the corresponding process parameters respectively, and finally obtain the printing process data of the skeleton structure and the curved surface structure.

[0018] Step S4. Import the printing process data of the skeleton structure and the curved surface structure into the 3D printing equipment respectively;

[0019] Step S5. Under the control of the industrial computer, the 3D printing equipment first reads the skeleton structure printing process data and starts printing until the skeleton structure printing is completed.

[0020] Step S6: Under the control of the industrial computer, the 3D printing equipment reads the printing process data of the curved structure and starts printing. Under the action of the 3D printing nozzle with Z-axis lifting function, the printing of the curved structure is completed, and the entire printing process ends.

[0021] The beneficial effects of this application are:

[0022] (1) This application sets a liftable support on the three-dimensional moving support of the 3D printing system, which allows the printing nozzle to maintain autonomous and controllable upward and downward movement in the Z direction while following the movement of the three-dimensional moving support. Therefore, it can transform the horizontal surface path of layer-by-layer printing in the existing 3D printing equipment into a curved surface path. By utilizing the mechanical properties of the material and the angle relationship between the coating direction of the printing nozzle, the interlayer bonding performance in the Z direction of the parts manufactured by the existing 3D printing equipment can be increased.

[0023] (2) In this application, the skeleton structure and the curved surface structure are designed independently in the three-dimensional interlayer reinforcement structure during 3D printing, which can more diversely control the performance of each area of ​​the part.

[0024] (3) The print head of this application can be directly installed on a regular printer, so the device can realize the function of enhanced printing of curved paths, which is simple to operate and has low equipment cost. Attached Figure Description

[0025] The foregoing and hereinafter detailed description of this application becomes clearer when read in conjunction with the following figures, in which:

[0026] Figure 1 This is a schematic diagram of the overall 3D printing nozzle of this application;

[0027] Figure 2 This is a cross-sectional view of the internal structure of the 3D printing nozzle in this application;

[0028] Figure 3 This is a schematic diagram of the three-dimensional interlayer reinforcement structure model of this application;

[0029] Figure 4 A schematic diagram of interlayer stress analysis is printed using the existing technology for a layer-by-layer horizontal surface path.

[0030] Figure 5 A schematic diagram of interlayer stress analysis for the curved path of this application is printed.

[0031] In the attached image:

[0032] 1. Three-dimensional moving support; 2. Filament feeding assembly; 3. Cooling assembly; 4. Heating assembly; 5. Printing nozzle; 6. Liftable support; 7. Liftable support Z-axis drive assembly; 8. Z-axis lifting guide assembly; 9. Guide sleeve; 10. Internal channel; 11. Throat area; 12. Annular resistance wire; 13. Heating area; 14. Printing filament; 23. Skeleton structure; 25. Curved surface structure; 201. Filament feeding gear; 202. Gear support; 701. Z-axis drive motor; 702. Screw; 703. Screw sleeve; 801. Guide post. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions in this application, the following will further illustrate the technical solutions for achieving the inventive objectives of this application through several specific embodiments. It should be noted that the technical solutions claimed in this application include, but are not limited to, the following embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of this application.

[0034] In the FDM deposition process, within each printing layer, the printhead moves horizontally to coat the molten, extruded material onto the worktable along the designed path. Once this layer is coated, the next layer can be started by raising the horizontal support holding the printhead or lowering the worktable plane, repeating this process until printing is complete. Due to the melt-deposition-cooling process characteristics of existing FDM technology, the adhesion between previous and subsequent layers, and between previous and adjacent coating paths, deteriorates due to differences in processing time and material surface temperature. The mechanical properties of the material are significantly affected by the angle between the printing nozzle's coating direction; the material along the nozzle's coating direction exhibits the best mechanical properties, while the material perpendicular to the nozzle's coating direction exhibits the worst mechanical properties. In existing layer-by-layer horizontal printing methods, poor interlayer adhesion and mechanical properties in the Z-direction of the printed part are difficult to avoid. Furthermore, current FDM printheads cannot support more advanced and diverse path printing methods.

[0035] Based on this, embodiments of this application propose a 3D printing nozzle with Z-axis lifting function and a 3D printing interlayer path strengthening method. By utilizing the nozzle to move significantly in the Z-axis, the curved direction of the printing path is achieved, and finally, Z-axis reinforcement is achieved through structure.

[0036] This embodiment first introduces and explains a 3D printing nozzle with Z-axis lifting function.

[0037] This embodiment discloses a 3D printing nozzle with Z-axis lifting function, as shown in the attached instruction manual. Figure 1The 3D printing nozzle mainly includes a three-dimensional moving support 1, a filament feeding assembly 2, a cooling assembly 3, a heating assembly 4, and a printing nozzle 5. These components are arranged sequentially from top to bottom. Initially, the printing filament is fed into the filament feeding assembly 2, then into the cooling assembly 3, and subsequently into the heating assembly 4 for heating, forming a molten material. The molten filament is then directly delivered from the heating assembly 4 to the printing nozzle 5, where it is extruded to achieve 3D printing of the product. Furthermore, to better adapt to the curved surface of the printing path and enhance the interlayer adhesion and mechanical properties of the printed parts in the Z-direction, in this embodiment, the printing nozzle also includes a liftable support 6 and a liftable support Z-direction drive assembly 7. These two components enable significant movement of the nozzle in the Z-direction, thereby better adapting to the curved surface of the printing path. The Z-axis reinforcement is ultimately achieved through a structure that follows the curved path of the printing path. Specifically, the liftable support 6 is located below the three-dimensional moving support 1, the filament feeding assembly 2 is disposed on the upper surface of the liftable support 6, the cooling assembly 3 is disposed on the lower surface of the liftable support 6, the heating assembly 4 is connected to the tail of the cooling assembly 3, and the printing nozzle 5 is disposed at the tail of the heating assembly 4. The Z-axis drive assembly 7 of the liftable support is disposed on the three-dimensional moving support 1 and connected to the liftable support 6. It includes a Z-axis drive motor 701, a screw 702, and a screw sleeve 703. The Z-axis drive motor 701 is disposed on the upper surface of the three-dimensional moving support 1, and the screw sleeve 703 is disposed on the upper surface of the liftable support 6. The output end of the Z-axis drive motor 701 is connected to one end of the screw 702, and the other end of the screw 702 is disposed in the screw sleeve 703.

[0038] In this embodiment, the three-dimensional moving support 1 can move independently in the X, Y, and Z directions within the printing device.

[0039] In this embodiment, with the combined action of the Z-axis drive motor 701, screw 702 and screw sleeve 703, the liftable bracket 6 can achieve independent Z-axis upward and downward movement relative to the three-dimensional moving bracket 1 of the printing system, thereby driving the printing nozzle 5 to autonomously and controllably move upward and downward in the Z-axis. Therefore, it can better adapt to the curved surface direction of the printing path and enhance the interlayer adhesion and mechanical properties of the printed parts in the Z-axis.

[0040] In this embodiment, the minimum continuous movement distance of the liftable bracket 6 is one screw pitch, approximately 0.01 mm. The maximum continuous movement distance depends on the working distance between the screw and the sleeve, and can range from tens to hundreds of millimeters, far exceeding that of general ultrasonic telescopic devices, piezoelectric telescopic devices, etc.

[0041] In this embodiment, it should be noted that the liftable bracket Z-axis drive assembly 7 is diagonally arranged on the three-dimensional moving bracket 1, which can provide stable Z-axis movement for the printing nozzle.

[0042] In this embodiment, it should also be noted that the tail of the cooling component 3 is connected to the heating component 4 by a threaded connection, and the tail of the heating component 4 is also connected to the print head by a threaded connection.

[0043] In this embodiment, it should also be noted that the Z-axis lifting assembly 7, which consists of the Z-axis drive motor 701, screw 702 and screw sleeve 703, can be replaced with any assembly or structure that enables the liftable bracket 6 to drive the printing nozzle 5 to move autonomously and controllably in the Z-axis direction to rise and fall, including but not limited to hydraulic assemblies, spring assemblies, deflection cam assemblies, flexible pressure plates, etc.

[0044] Furthermore, the printhead also includes a Z-axis lifting guide assembly 8, which includes a guide post 801 fixed to the upper surface of the liftable support 6. A guide sleeve that mates with the guide post 801 is provided on the three-dimensional moving support 1. The liftable support 6 and the three-dimensional moving support 1 of the printing system are positioned relative to each other via the guide post 801 and the guide sleeve.

[0045] In this embodiment, it should also be noted that the Z-axis lifting guide component 8 is also arranged diagonally on the three-dimensional moving support 1.

[0046] Furthermore, the filament feeding assembly 2 mainly includes a filament feeding gear 201, which is mounted on a gear support 202. The gear support 202 is mounted on a liftable support 6. There are two filament feeding gears 201, which are symmetrically arranged on the gear support 202 and driven by a filament feeding motor. The two gears rotate and mesh to generate filament feeding pressure, thereby feeding the printing filament into the cooling assembly 3.

[0047] Furthermore, the cooling assembly 3 has an internal channel 10, the inlet of which is connected to the outlet of the filament feeding assembly 2. The printing filament is fed into the internal channel of the cooling assembly 3 via the filament feeding assembly 2. The diameter of the internal channel 10 matches the diameter of the printing filament, ensuring that the printing filament is transported and moved under the action of the filament feeding assembly 2. A heating assembly 4 is provided at the outlet of the internal channel 10.

[0048] Furthermore, the upper part of the heating component 4 is provided with a throat region 11, and the lower part is provided with an annular resistance wire 12 installed. This region is a heating region 13. The throat region 11 is connected to the internal channel 10 of the cooling component 3. The printing filament enters the heating region 13 of the heating component 4 through the throat region 11. The heating component 4 is provided with a heat insulation coating or a heat preservation layer on the outside.

[0049] In this embodiment, the cooling component 3 can use air cooling, water cooling or coolant to cool and lower the temperature of the printing filament in the internal channel 10 and throat region 11 to prevent the filament from overheating, softening and deforming.

[0050] Furthermore, in this embodiment, the wire feeding assembly 2, cooling assembly 3, heating assembly 4, and Z-axis drive assembly 7 of the liftable bracket are all connected to the industrial control computer.

[0051] Based on the same inventive concept, this embodiment also discloses an interlayer path enhancement method, which is implemented based on the above-mentioned 3D printing nozzle with Z-axis lifting function, and specifically includes the following steps.

[0052] Step S101. Using computer-aided design software, first establish a three-dimensional interlayer reinforcement structure model. The structural design principle is as follows: Figure 3 and Figure 4 As shown, the purpose is to transform the horizontal surface path of layer-by-layer printing in existing 3D printing equipment into a curved surface path, and to increase the interlayer adhesion in the Z direction of parts manufactured by existing 3D printing equipment by utilizing the angular relationship between the mechanical properties of the material and the coating direction of the printing nozzle; such as Figure 5 As shown, the three-dimensional interlayer reinforcement structure consists of a bottom skeleton structure 23 and an upper curved surface structure 25. The skeleton structure 23 serves as a component of the three-dimensional interlayer reinforcement structure and provides support for the printing of the curved surface structure 25.

[0053] Step S102. Import the three-dimensional interlayer reinforcement structure model into the slicing software, process the slices of skeleton structure 23 and curved surface structure 25 separately, and obtain their corresponding slice contour data information.

[0054] Step S103. Import the slice outline data of skeleton structure 23 and curved surface structure 25 into computer-aided design software, produce the printing paths of skeleton structure 23 and curved surface structure 25 according to the printing process requirements, and set the corresponding process parameters respectively, and finally obtain the printing process data of skeleton structure 23 and curved surface structure 25.

[0055] Step S104. Import the printing process data of the skeleton structure 23 and the curved surface structure 25 into the 3D printing equipment respectively.

[0056] Step S105. Install the 3D printing nozzle with Z-axis lifting function on a general printing device, turn on the cooling component 3 and the heating component 4 in sequence, and after the temperature requirement is met, pass the printing filament through the filament feeding component 2, the internal channel 10 in the cooling component 3, the throat area 13 and the heating area 11 of the heating component 4 in sequence.

[0057] Step S106. Under the control of the industrial computer, the 3D printing equipment first reads the printing process data of the skeleton structure 23 and starts printing until the skeleton structure 23 is printed.

[0058] Step S106. Under the control of the industrial computer, the 3D printing equipment reads the printing process data of the curved structure 25 and starts printing. Under the action of the 3D printing nozzle with Z-axis lifting function, the printing of the curved structure 25 is completed, and the entire printing process ends.

[0059] In this embodiment, it should be noted that the skeleton structure 23 can be printed using a regular printing nozzle or a 3D printing nozzle with Z-axis lifting function as described in this embodiment.

[0060] In this embodiment, the computer-aided design software is one of Autodesk Inventor, Solidworks, CATIA, ZW3D, Pro / E, AutoCAD, UG NX, SolidEdge, or Onespace.

[0061] In this embodiment, the slicing software is one of Magics, Cura, XBuilder, Maker Bot, Slic3r, or Simplify3D.

[0062] In this embodiment, the printing material for the three-dimensional interlayer reinforcement structure can be a thermoplastic material or a thermosetting material, which can be composite with short fibers, continuous fibers, etc.

[0063] In this embodiment, the skeleton structure 23 can be arbitrarily oriented in the printing platform, and multiple skeleton structures 23 can be interconnected. It can also be a combination or connection of skeleton structures 23 of various shapes and geometric sizes.

[0064] In this embodiment, the printing path of the curved structure 25 contains a large number of curved paths. Therefore, during the printing process, it is necessary to control the Z-axis drive motor 701 so that the printing nozzle mounted on the three-dimensional moving bracket 1 can obtain a local lifting function in the Z direction, thereby completing the printing of the curved path.

[0065] In this embodiment, the design principle of the skeleton structure 23 and the curved surface structure 25 of the three-dimensional interlayer reinforcement structure is to transform the existing 3D printing layer-by-layer horizontal surface path printing into curved surface path printing, so that the angle between the printing head coating path direction and the Z direction of a part of the model is <90°.

[0066] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as an obstacle to the scope of protection of this application.

[0067] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0068] The above description is merely a preferred embodiment of this application and is not intended to hinder this application in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of this application shall fall within the protection scope of this application.

Claims

1. A 3D printing nozzle with Z-direction lifting function, comprising a three-dimensional moving support (1), a wire feeding assembly (2), a cooling assembly (3), a heating assembly (4) and a printing nozzle (5) arranged in sequence from top to bottom, the printing wire is sent into the cooling assembly (3) and the heating assembly (4) by the wire feeding assembly (2) in turn, and finally the melted material is extruded through the printing nozzle (5), characterized in that, Also included are the liftable bracket (6) and the liftable bracket Z-direction driving assembly (7), the liftable bracket (6) is located below the three-dimensional moving bracket (1), the wire feeding assembly (2), the cooling assembly (3), the heating assembly (4) and the printing nozzle (5) are arranged on the liftable bracket (6), the liftable bracket Z-direction driving assembly (7) is arranged on the three-dimensional moving bracket (1) and connected with the liftable bracket (6); the liftable bracket Z-direction driving assembly (7) comprises a Z-direction driving motor (701), a screw rod (702) and a screw sleeve (703), the Z-direction driving motor (701) is arranged on the three-dimensional moving bracket (1), the screw sleeve (703) is arranged on the liftable bracket (6), and one end of the screw rod (702) is connected with the output end of the Z-direction driving motor (701), and the other end of the screw rod (702) is arranged in the screw sleeve (703); The 3D printing interlayer path strengthening method realized by the 3D printing nozzle with the Z-direction lifting function comprises the following steps: Step S1. A three-dimensional interlayer strengthening structure model is established, and the model structure comprises a skeleton structure (23) at the bottom and a curved surface structure (25) at the upper part; Step S2. The skeleton structure (23) and the curved surface structure (25) of the three-dimensional interlayer strengthening structure model are respectively subjected to slicing processing to obtain corresponding slice contour data information; Step S3. According to the slice contour data of the skeleton structure (23) and the curved surface structure (25), the printing paths of the skeleton structure (23) and the curved surface structure (25) are respectively generated according to the printing process requirements, and corresponding process parameters are respectively set, and finally the printing process data of the skeleton structure (23) and the curved surface structure (25) are obtained; Step S4. The printing process data of the skeleton structure (23) and the curved surface structure (25) are respectively imported into the 3D printing equipment; Step S5. The 3D printing equipment reads the printing process data of the skeleton structure (23) under the control of the industrial computer, and starts printing until the printing of the skeleton structure (23) is completed; Step S6. The 3D printing equipment reads the printing process data of the curved surface structure (25) under the control of the industrial computer, and starts printing, and controls the Z-direction driving motor (701) in the printing process, so that the printing nozzle installed on the three-dimensional moving bracket (1) obtains the local lifting function in the Z-direction, and finally the printing of the curved surface structure (25) is completed under the action of the 3D printing nozzle with the Z-direction lifting function, and the whole printing process is completed.

2. The 3D printing nozzle with Z-direction lifting function according to claim 1, characterized in that, Also included is a Z-direction lifting guide assembly (8), the Z-direction lifting guide assembly (8) comprises a guide column (801), the guide column (801) is fixed on the liftable bracket (6), and the three-dimensional moving bracket (1) is provided with a guide sleeve matched with the guide column (801). 3.The 3D printing nozzle with Z-direction lifting function according to claim 1, wherein, The wire feeding assembly (2) comprises a wire feeding gear (201), and the wire feeding gear (201) is arranged on a gear bracket (202), and the gear bracket (202) is arranged on the liftable bracket (6).

4. The 3D printing nozzle with Z-direction lifting function according to claim 1, characterized in that, The cooling assembly (3) adopts air cooling, water cooling or coolant cooling.

5. The 3D printing nozzle with Z-direction lifting function according to claim 1, characterized in that, The heating assembly (4) is externally provided with a heat insulation coating or a heat preservation layer.

6. The 3D printing nozzle with Z-direction lifting function according to claim 1, characterized in that, The wire feeding assembly (2), the cooling assembly (3), the heating assembly (4) and the Z-direction driving assembly (7) of the liftable support are respectively connected with the industrial computer.

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