A metal 3D printer nozzle

Abstract

The invention discloses a metal 3D printer nozzle, and relates to the technical field of additive manufacturing. The nozzle comprises a connecting frame, a scraper, a limiting assembly, a stirring assembly, a shell and a nozzle located on the metal 3D printer. A first extrusion rod is rotatably arranged in the shell, a driving motor for driving the first extrusion rod to rotate is arranged on the top of the shell, a feeding assembly is arranged on the outer side of the shell, a mounting hole is arranged at the axis center of the first extrusion rod, a mounting shaft is arranged in the mounting hole, a fixing rod is arranged in the mounting shaft, a mounting groove is arranged on the outer side of the mounting shaft, and the scraper is arranged in the mounting groove. The invention utilizes the first extrusion rod to extrude metal powder from the nozzle. When the metal powder is solidified in the nozzle, the fixing rod is rotated by the limiting assembly, and the limiting block is driven to rotate in the mounting shaft, so that the scraper is taken out from the mounting groove until the size of the scraper tail end matches the size inside the nozzle. As the mounting shaft continues to rotate downward, the scraper is driven to scrape the inner wall of the nozzle, so that the solidified metal powder is taken out from the nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of additive manufacturing, and in particular to a metal 3D printer nozzle. Background Art

[0002] Metal 3D printing is a type of rapid prototyping technology, also known as additive manufacturing. It is a technology that uses metal powder to construct objects by printing layer by layer based on digital model files. The printed objects with metal powder have a better texture.

[0003] The existing mature metal 3D printing technologies mainly include laser selective sintering, selective laser melting, laser near-net forming and electron beam selective melting technology. The existing metal spray deposition 3D printing method based on metal spray deposition technology and 3D printing method directly melts the metal material in the nozzle through a feeding mechanism and sprays it onto the forming base plate, forming metal parts by layer-by-layer accumulation.

[0004] After the nozzle assembly of the metal 3D printer is used, the temperature of the metal powder material inside the nozzle will drop, so the metal powder material will solidify in a very short time. The solidified metal powder material is easy to clog the nozzle, thus affecting normal operation. The prior art uses a mechanical extrusion mechanism to extrude and deform the solidified metal powder material to loosen it and fall off the inner wall of the nozzle. When the metal powder material inside the nozzle is severely solidified, the hardness of the metal powder material increases, making it difficult to loosen the metal powder material by simple extrusion to solve the clogging problem. For this reason, we propose a metal 3D printer nozzle. Summary of the invention

[0005] The purpose of the present invention is to provide a metal 3D printer nozzle to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a metal 3D printer nozzle, comprising a connecting frame, a scraper, a limit assembly and a stirring assembly located on the metal 3D printer, a shell is fixedly provided at the bottom of the connecting frame, a nozzle is provided at the bottom of the shell, a first extrusion rod is rotatably provided in the shell, a driving motor for driving the first extrusion rod to rotate is provided at the top of the shell, a feeding assembly is provided on the outside of the shell, and the feeding assembly is used to transport metal powder for injection, a mounting hole is provided at the axis center of the first extrusion rod, a mounting shaft is provided in the mounting hole, an inner cavity is provided in the mounting shaft, a fixed rod is rotatably provided in the inner cavity, a mounting groove is provided on the outside of the mounting shaft, a scraper is provided in the mounting groove, a limit block for adjusting the position of the scraper is fixedly provided at the bottom of the fixed rod, the limit assembly is provided in the mounting shaft for controlling the rotation of the fixed rod, and the stirring assembly is provided in the shell for stirring and mixing the metal powder entering the nozzle.

[0007] Preferably, the limiting assembly includes a rotating wheel, which is fixedly arranged on the top end of the fixing rod, the mounting shaft is rotatably connected to the inner side of the mounting hole, a rotating frame is fixedly arranged on the top end of the mounting shaft, a first external thread is arranged on the outer side of the top end of the fixing rod, the first external thread is threadedly matched with a first internal thread arranged in the inner cavity, a fracture is arranged on the middle section of the fixing rod, the fixing rod is divided into an upper section and a lower section through the fracture, an embedding groove is arranged on the bottom of the upper section of the fixing rod, an embedding column is fixedly arranged on the top of the lower section of the fixing rod, the embedding column is slidably matched with the embedding groove, a limiting ring is fixedly arranged on the outer side of the lower section of the fixing rod, and an annular groove matching with the limiting ring is arranged in the inner cavity.

[0008] Preferably, the scraper tool has a curved head and an extended tail, the inner and outer sides of the scraper are arc-shaped, the outer side of the scraper is flush with the outer side of the mounting shaft, a protrusion that cooperates with the inner side of the scraper is fixed in the mounting groove, the outer side of the scraper head is fixed with evenly distributed arc-shaped external teeth, and the outer side of the limit block is fixed with evenly distributed circumferential external teeth that mesh with the arc-shaped external teeth.

[0009] Preferably, a fixed shaft is fixed in the mounting groove, a torsion spring is provided on the fixed shaft, the fixed shaft is arranged in a recessed groove arranged on the head of the scraper, the scraper is rotatably connected to the fixed shaft, one end of the torsion spring is fixed to the scraper, and the other end is fixed to the mounting groove.

[0010] Preferably, a second external thread is provided on the outer side of the top of the installation shaft, and the second external thread cooperates with a second internal thread provided in the installation hole, and evenly distributed auxiliary blades are fixedly provided on the bottom of the installation shaft.

[0011] Preferably, a mounting frame is fixedly provided on the top of the shell, a rotating shaft is rotatably provided inside the mounting frame, a main gear is fixedly provided on the rotating shaft, a driving motor is fixedly provided on the top of the mounting frame, an output end of the driving motor is fixed to the rotating shaft, a sub-gear is fixedly provided on the top end of the first extrusion rod passing through the shell, and the main gear is meshingly connected with the sub-gear.

[0012] Preferably, the stirring assembly includes a stirring frame, an annular opening is provided on the outer side of the bottom of the shell, the shell is divided into an upper section and a lower section by the annular opening, a fixed frame for connecting and fixing the upper section and the lower section of the shell is provided on the outer side of the annular opening, a rotating ring is rotatably provided in the annular opening, the bottom end of the rotating shaft passes through the mounting frame and is rotatably connected to the fixed frame, an auxiliary gear is fixedly provided on the outer side of the bottom end of the rotating shaft, annular teeth meshing with the auxiliary gear are provided on the outer side of the rotating ring, and multiple stirring frames are provided, and the multiple stirring frames are evenly fixed on the inner side of the rotating ring.

[0013] Preferably, the lower section of the housing is a tapered cylinder extending from the housing to the nozzle.

[0014] Preferably, a scraper is fixedly provided at the bottom of the stirring frame, and the scraper is slidably matched with the inner side of the shell.

[0015] Preferably, the feed assembly includes a feed pipe, a fixed pipe is connected to the outside of the shell, an auxiliary motor is fixedly provided at one end of the fixed pipe away from the shell, a second extrusion rod is rotatably provided inside the fixed pipe, the output end of the auxiliary motor is fixed to the second extrusion rod, and the feed pipe is fixedly provided at the top of the fixed pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes a first extrusion rod to extrude metal powder from a nozzle. When the metal powder is solidified in the nozzle, the fixing rod is rotated by a limiting assembly to drive the limiting block to rotate in the mounting shaft, thereby removing the scraper from the mounting groove until the size of the scraper tail end matches the size inside the nozzle. As the mounting shaft continues to rotate downward, the scraper is driven to scrape the inner wall of the nozzle, thereby removing the solidified metal powder from the nozzle.

[0018] 2. By setting a first external thread that cooperates with the mounting shaft on the outside of the fixing rod, the fixing rod is rotated, and the limit block drives the scraper to rotate to a suitable position through the engagement of the circumferential external teeth and the arc-shaped external teeth, and then stops rotating. At this time, under the action of the thread, the position of the scraper can be limited, thereby preventing the scraper from accidentally moving when scraping the metal powder inside the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a partial cross-sectional schematic diagram of the overall structure of the present invention;

[0021] Figure 3 is a cross-sectional schematic diagram of a first extrusion rod of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first extrusion rod, the mounting shaft and the fixing rod of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal structure of the mounting shaft and the fixing rod of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the scraper of the present invention when it is in a storage state;

[0025] Figure 7 It is a structural schematic diagram of the scraper of the present invention when it is in use;

[0026] Figure 8 This is a schematic diagram of the structure of the stirring assembly of the present invention;

[0027] Fig. 9 This is a schematic diagram of the bottom structure of the mounting shaft of the present invention.

[0028] In the figure: 1-connecting frame; 2-housing; 3-nozzle; 4-first extrusion rod; 5-driving motor; 6-feeding assembly; 7-scraper; 8-mounting hole; 9-mounting shaft; 10-inner cavity; 11-fixing rod; 12-mounting groove; 13-limiting block; 14-limiting assembly; 15-stirring assembly; 16-rotating wheel; 17-rotating frame; 18-first external thread; 19-embedded groove; 20-embedded column; 21-limiting ring; 22 - annular groove; 23 - torsion spring; 24 - fixed shaft; 25 - second external thread; 26 - auxiliary blade; 27 - mounting frame; 28 - rotating shaft; 29 - main gear; 30 - secondary gear; 31 - stirring frame; 32 - fixed frame; 33 - rotating ring; 34 - auxiliary gear; 35 - scraper; 36 - feed pipe; 37 - fixed pipe; 38 - auxiliary motor; 39 - second extrusion rod; 40 - arc-shaped external teeth; 41 - circumferential external teeth. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0030] Please refer to Figure 1-Figure 9 In the figure, a metal 3D printer nozzle includes a connecting frame 1, a scraper 7, a limit assembly 14 and a stirring assembly 15 located on the metal 3D printer. A shell 2 is fixedly provided at the bottom of the connecting frame 1, a nozzle 3 is provided at the bottom of the shell 2, a first extrusion rod 4 is rotatably provided in the shell 2, a driving motor 5 is provided at the top of the shell 2 for driving the first extrusion rod 4 to rotate, a feed assembly 6 is provided on the outside of the shell 2, and the feed assembly 6 is used to transport metal powder for injection, a mounting hole 8 is provided at the axis center of the first extrusion rod 4, a mounting shaft 9 is provided in the mounting hole 8, an inner cavity 10 is provided in the mounting shaft 9, a fixing rod 11 is rotatably provided in the inner cavity 10, and a fixing rod 11 is provided on the outside of the mounting shaft 9. A mounting groove 12 is provided, and the scraper 7 is provided in the mounting groove 12. A limit block 13 for adjusting the position of the scraper 7 is fixedly provided at the bottom of the fixing rod 11. The metal powder is extruded from the nozzle 3 through the first extrusion rod 4 to perform a 3D printing operation. After use, when the metal powder material inside the nozzle 3 solidifies due to a drop in temperature and blocks the nozzle 3, after adjusting the scraper 7 to a position matching the inner side of the nozzle 3, the mounting shaft 9 is rotated to drive the scraper 7 to rotate inside the nozzle 3 to scrape off the metal powder on the inner wall of the nozzle 3. As the mounting shaft 9 continues to drop, the scraper 7 can scrape off all the metal powder on the inner wall of the nozzle 3.

[0031] It is worth noting that: this application is to improve the nozzle of the metal 3D printer;

[0032] The limiting assembly 14 is arranged in the installation shaft 9, and is used to control the rotation of the fixing rod 11. The fixing rod 11 cooperates with the first internal thread of the inner cavity 10 of the installation shaft 9 through the first external thread 18, so as to slowly adjust the position of the scraper 7 and limit the position of the scraper 7.

[0033] The stirring assembly 15 is arranged in the shell 2, and is used for stirring and mixing the metal powder entering the nozzle 3. The stirring frame 31 revolves with the rotation of the first extrusion rod 4, so as to mix the metal powder between the first extrusion rod 4 and the nozzle 3, and prevent the problem of uneven density of the metal powder caused by deposition when the metal powder enters the nozzle 3.

[0034] Some implementation methods of the present application are described in detail below with reference to the accompanying drawings:

[0035] Please refer to Figure 1-Figure 9 In this embodiment: the metal powder is extruded from the nozzle 3 by the first extrusion rod 4. When the metal powder is solidified in the nozzle 3, the fixing rod 11 is rotated by the limiting assembly 14, driving the limiting block 13 to rotate in the mounting shaft 9, thereby taking the scraper 7 out of the mounting groove 12 until the size of the tail end of the scraper 7 matches the size inside the nozzle 3. As the mounting shaft 9 continues to rotate downward, the scraper 7 is driven to scrape the inner wall of the nozzle 3, thereby removing the solidified metal powder from the nozzle 3.

[0036] The limiting assembly 14 includes a rotating wheel 16, which is fixedly arranged at the top of the fixing rod 11, the mounting shaft 9 is rotatably connected to the inner side of the mounting hole 8, a rotating frame 17 is fixedly arranged at the top of the mounting shaft 9, a first external thread 18 is arranged on the outer side of the top of the fixing rod 11, and the first external thread 18 is threadably matched with the first internal thread arranged in the inner cavity 10, a fracture is arranged in the middle section of the fixing rod 11, and the fixing rod 11 is divided into an upper section and a lower section through the fracture, an embedding groove 19 is arranged at the bottom of the upper section of the fixing rod 11, an embedding column 20 is fixedly arranged at the top of the lower section of the fixing rod 11, and the embedding column 20 is slidably matched with the embedding groove 19, a limiting ring 21 is fixedly arranged on the outer side of the lower section of the fixing rod 11, and an annular groove 22 matching with the limiting ring 21 is arranged in the inner cavity 10;

[0037] In addition, the scraper 7 has a curved head and an extended tail, the inner and outer sides of the scraper 7 are arc-shaped, the outer side of the scraper 7 is flush with the outer side of the mounting shaft 9, a protrusion that matches the inner side of the scraper 7 is fixedly provided in the mounting groove 12, and evenly distributed arc-shaped external teeth 40 are fixedly provided on the outer side of the head of the scraper 7, and evenly distributed circumferential external teeth 41 that mesh with the arc-shaped external teeth 40 are fixedly provided on the outer side of the limit block 13;

[0038] Furthermore, a fixed shaft 24 is fixed in the mounting groove 12, a torsion spring 23 is provided on the fixed shaft 24, the fixed shaft 24 is arranged in a sink groove arranged at the head of the scraper 7, the scraper 7 is rotatably connected to the fixed shaft 24, one end of the torsion spring 23 is fixed to the scraper 7, and the other end is fixed to the mounting groove 12;

[0039] At the same time, a second external thread 25 is provided on the outer side of the top of the installation shaft 9, and the second external thread 25 cooperates with the second internal thread provided in the installation hole 8, and evenly distributed auxiliary blades 26 are fixedly provided at the bottom of the installation shaft 9;

[0040] The principle of the limiting component 14 limiting the scraper 7 in the installation groove 12 is as follows: when the metal powder in the nozzle 3 is solidified and needs to be cleaned, the installation shaft 9 is rotated by the rotating frame 17 to move the scraper 7 out of the installation hole 8, and then the rotating wheel 16 is rotated to drive the fixed rod 11 to rotate. At this time, the fixed rod 11 gradually penetrates into the inner cavity 10 of the installation shaft 9 through the first external thread 18 during rotation. In this process, the embedded column 20 is always embedded in the embedded groove 19. Therefore, the upper section and the lower section of the fixed rod 11 can rotate synchronously with the rotating wheel 16. At the same time, when the fixed rod 11 rotates, the lower section of the fixed rod 11 is locked due to the existence of the limiting ring 21. When the position is limited in the inner cavity 10, the upper section of the fixing rod 11 gradually descends. During this process, the limit block 13 drives the scraper 7 to gradually rotate out of the installation groove 12 through the meshing of the circumferential outer teeth 41 and the arc-shaped outer teeth 40, until the scraper 7 is rotated to a position that matches the internal size of the nozzle 3, and then the installation shaft 9 is rotated. The second outer thread 25 is used to gradually descend while the installation shaft 9 is rotated. When the installation shaft 9 contacts the solidified metal powder in the nozzle 3, the rotating installation shaft 9 opens a circuit through the auxiliary blade 26, and the scraper 7 scrapes the inner wall of the nozzle 3 to clean out all the solidified metal powder in the nozzle 3.

[0041] When the scraper 7 scrapes off the solidified metal powder on the inner wall of the nozzle 3 , the scraper 7 is pressed against the inner wall of the nozzle 3 by the reaction force of the metal powder, thereby ensuring that the scraper 7 always fits the inner wall of the nozzle 3 during scraping.

[0042] At the same time, a mounting frame 27 is fixedly provided on the top of the housing 2, a rotating shaft 28 is rotatably provided in the mounting frame 27, a main gear 29 is fixedly provided on the rotating shaft 28, a driving motor 5 is fixedly provided on the top of the mounting frame 27, an output end of the driving motor 5 is fixed to the rotating shaft 28, a sub-gear 30 is fixedly provided on the top end of the first extrusion rod 4 penetrating through the housing 2, and the main gear 29 is meshedly connected with the sub-gear 30;

[0043] like Figure 1 and Figure 2As shown, the feed assembly 6 includes a feed pipe 36, a fixed pipe 37 is connected to the outside of the shell 2, an auxiliary motor 38 is fixedly provided at one end of the fixed pipe 37 away from the shell 2, a second extrusion rod 39 is rotatably provided in the fixed pipe 37, the output end of the auxiliary motor 38 is fixed to the second extrusion rod 39, and the feed pipe 36 is fixedly provided at the top of the fixed pipe 37;

[0044] The rotating shaft 28 is driven to rotate by the operation of the driving motor 5, and then the first extrusion rod 4 is driven to rotate by the cooperation of the main gear 29 and the sub-gear 30, and the second extrusion rod 39 is driven to rotate by the auxiliary motor 38, so that the metal powder entering the feed pipe 36 is pushed into the shell 2, and then pushed to the nozzle 3 by the first extrusion rod 4 for extrusion, and the 3D printing operation is performed.

[0045] like Figure 2 and Figure 8 As shown, the stirring assembly 15 includes a stirring frame 31, an annular opening is provided on the outer side of the bottom of the shell 2, and the shell 2 is divided into an upper section and a lower section through the annular opening. A fixing frame 32 for connecting and fixing the upper section and the lower section of the shell 2 is provided on the outer side of the annular opening, and a rotating ring 33 is rotatably provided in the annular opening. The bottom end of the rotating shaft 28 passes through the mounting frame 27 and is rotatably connected to the fixing frame 32. An auxiliary gear 34 is fixedly provided on the outer side of the bottom end of the rotating shaft 28, and an annular tooth meshing with the auxiliary gear 34 is provided on the outer side of the rotating ring 33. A plurality of stirring frames 31 are provided, and the plurality of stirring frames 31 are evenly fixed on the inner side of the rotating ring 33.

[0046] The principle of the stirring assembly 15 stirring and mixing the metal powder entering the nozzle 3 is as follows: when the driving motor 5 drives the first extrusion rod 4 to extrude the metal powder, the rotating shaft 28 drives the auxiliary gear 34 to rotate, thereby driving the rotating ring 33 to rotate through the cooperation of the auxiliary gear 34 and the annular gear, thereby driving the stirring frame 31 to revolve in the shell 2 through the rotating ring 33, and the metal powder between the first extrusion rod 4 and the nozzle 3 is mixed by the rotation of the stirring frame 31 to prevent the metal powder from being deposited and having uneven density.

[0047] In this scheme,

[0048] First, the device is installed on the 3D printing device through the connecting frame 1, and the rotating shaft 28 is driven to rotate by the operation of the driving motor 5, and then the first extrusion rod 4 is driven to rotate by the cooperation of the main gear 29 and the sub-gear 30, and the second extrusion rod 39 is driven to rotate by the auxiliary motor 38, so that the metal powder entering the feed pipe 36 is pushed into the shell 2, and then pushed to the nozzle 3 by the first extrusion rod 4 for extrusion, and the 3D printing operation is performed;

[0049] After use, the temperature of the metal powder material inside the nozzle 3 will drop, so the metal powder material will solidify in a very short time. The solidified metal powder material is likely to clog the nozzle 3. At this time, the following steps are performed to clean the solidified metal powder in the nozzle 3:

[0050] In the first step, the installation shaft 9 is rotated by the rotating frame 17 to move the scraper 7 out of the installation hole 8, and then the rotating wheel 16 is rotated to drive the fixing rod 11 to rotate. At this time, the fixing rod 11 gradually penetrates into the inner cavity 10 of the installation shaft 9 through the first external thread 18 during rotation. In this process, the embedded column 20 is always embedded in the embedded groove 19. Therefore, the upper section and the lower section of the fixing rod 11 can rotate synchronously with the rotating wheel 16. At the same time, when the fixing rod 11 rotates, the lower section of the fixing rod 11 is limited in the inner cavity 10 due to the existence of the limiting ring 21, and the upper section of the fixing rod 11 gradually descends. During this process, the scraper 7 is gradually screwed out of the mounting groove 12 until the scraper 7 is rotated to a position that matches the internal size of the nozzle 3, and then the mounting shaft 9 is rotated. The mounting shaft 9 gradually descends while rotating by using the second external thread 25. When the mounting shaft 9 contacts the solidified metal powder in the nozzle 3, the rotating mounting shaft 9 opens a circuit through the auxiliary blade 26. When the scraper 7 rotates, due to the existence of the torsion spring 23, the scraper 7 is always kept at a restricted position, so that the scraper 7 scrapes the inner wall of the nozzle 3 to clean out all the solidified metal powder in the nozzle 3.

[0051] The third step is to retract the scraper 7 into the mounting groove 12 by reversing the fixing rod 11. At this time, under the action of the limit block 13, the inner side of the scraper 7 cooperates with the limit block 13, and the outer side of the scraper 7 is flush with the outer side of the mounting shaft 9. After that, the scraper 7 is retracted into the mounting hole 8 together with the mounting shaft 9 by reversing the mounting shaft 9. Finally, the bottom of the mounting shaft 9 is flush with the bottom of the first extrusion rod 4, which can prevent metal powder from squeezing into the mounting hole 8 during the printing operation.

[0052] When the driving motor 5 drives the first extrusion rod 4 to extrude metal powder, the rotating shaft 28 drives the auxiliary gear 34 to rotate, thereby driving the rotating ring 33 to rotate through the cooperation of the auxiliary gear 34 and the annular gear, thereby driving the stirring frame 31 to revolve in the shell 2 through the rotating ring 33, and the metal powder between the first extrusion rod 4 and the nozzle 3 is mixed by the rotation of the stirring frame 31 to prevent the metal powder from being deposited and having uneven density.

[0053] In the implementation of this technical solution, if Figure 8 As shown, the stirring frame 31 is optimized;

[0054] Specifically, a scraper 35 is fixedly provided at the bottom of the stirring frame 31, and the scraper 35 is slidably matched with the inner side of the shell 2. The setting of the scraper 35 can scrape the metal powder on the inner wall of the shell 2 to the center of the shell 2, thereby improving the uniform mixing of the metal powder at various locations inside the shell 2.

[0055] In the implementation of this technical solution, if Figure 1 As shown, the housing 2 at the nozzle 3 is optimized;

[0056] Specifically, the lower section of the shell 2 is a conical cylinder extending from the shell 2 to the nozzle 3. The setting of the conical cylinder can facilitate the metal powder to directly and smoothly enter the nozzle 3 under the extrusion of the first extrusion rod 4, which helps to stabilize the flow of the metal powder, reduce the fluctuation and instability of the metal powder extrusion, and ensure the extrusion efficiency of the metal powder.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal 3D printer nozzle, characterized in that: include: A connecting frame (1) is located on a metal 3D printer, a shell (2) is fixedly provided at the bottom of the connecting frame (1), a nozzle (3) is provided at the bottom of the shell (2), a first extrusion rod (4) is rotatably provided in the shell (2), a driving motor (5) is provided at the top of the shell (2) for driving the first extrusion rod (4) to rotate, a feed assembly (6) is provided on the outside of the shell (2), and the feed assembly (6) is used to transport metal powder for injection; A scraper (7), wherein a mounting hole (8) is provided at the axis center of the first extrusion rod (4), a mounting shaft (9) is provided in the mounting hole (8), an inner cavity (10) is provided in the mounting shaft (9), a fixing rod (11) is rotatably provided in the inner cavity (10), a mounting groove (12) is provided on the outer side of the mounting shaft (9), the scraper (7) is arranged in the mounting groove (12), and a limit block (13) for adjusting the position of the scraper (7) is fixedly provided at the bottom of the fixing rod (11); a limit assembly (14), the limit assembly (14) being arranged in the installation shaft (9) and used for controlling the rotation of the fixed rod (11); the limit assembly (14) comprising a rotating wheel (16), the rotating wheel (16) being fixedly arranged at the top end of the fixed rod (11); a fracture opening being arranged in the middle section of the fixed rod (11); the fixed rod (11) being divided into an upper section and a lower section through the fracture opening; an embedding groove (19) being arranged at the bottom of the upper section of the fixed rod (11); an embedding column (20) being fixedly arranged at the top of the lower section of the fixed rod (11); the embedding column (20) being slidably matched with the embedding groove (19); a limit ring (21) being fixedly arranged on the outer side of the lower section of the fixed rod (11); and an annular groove (22) matching with the limit ring (21) being arranged in the inner cavity (10); A stirring component (15), the stirring component (15) is arranged in the shell (2) and is used to stir and mix the metal powder entering the nozzle (3).

2. A metal 3D printer nozzle according to claim 1, characterized in that: The mounting shaft (9) is rotatably connected to the inner side of the mounting hole (8); a rotating frame (17) is fixedly provided at the top end of the mounting shaft (9); a first external thread (18) is provided at the outer side of the top end of the fixing rod (11); the first external thread (18) is threadably matched with a first internal thread provided in the inner cavity (10).

3. A metal 3D printer nozzle according to claim 2, characterized in that: The scraper (7) has a curved head and an extended tail. Both inner and outer sides of the scraper (7) are arc-shaped. The outer side of the scraper (7) is flush with the outer side of the mounting shaft (9). A protrusion that cooperates with the inner side of the scraper (7) is fixedly provided in the mounting groove (12). The outer side of the head of the scraper (7) is fixedly provided with evenly distributed arc-shaped external teeth (40). The outer side of the limit block (13) is fixedly provided with evenly distributed circumferential external teeth (41) that mesh with the arc-shaped external teeth (40).

4. A metal 3D printer nozzle according to claim 3, characterized in that: A fixed shaft (24) is fixedly arranged in the installation groove (12), a torsion spring (23) is arranged on the fixed shaft (24), the fixed shaft (24) is arranged in a recessed groove arranged at the head of the scraper (7), the scraper (7) is rotatably connected to the fixed shaft (24), one end of the torsion spring (23) is fixed to the scraper (7), and the other end is fixed to the installation groove (12).

5. A metal 3D printer nozzle according to claim 2, characterized in that: A second external thread (25) is provided on the outer side of the top of the installation shaft (9), and the second external thread (25) cooperates with a second internal thread provided in the installation hole (8). Auxiliary blades (26) distributed evenly are fixedly provided on the bottom of the installation shaft (9).

6. A metal 3D printer nozzle according to claim 2, characterized in that: A mounting frame (27) is fixedly provided on the top of the shell (2), a rotating shaft (28) is rotatably provided inside the mounting frame (27), a main gear (29) is fixedly provided on the rotating shaft (28), the driving motor (5) is fixedly provided on the top of the mounting frame (27), an output end of the driving motor (5) is fixed to the rotating shaft (28), a sub-gear (30) is fixedly provided on the top end of the first extrusion rod (4) passing through the shell (2), and the main gear (29) is meshingly connected with the sub-gear (30).

7. A metal 3D printer nozzle according to claim 6, characterized in that: The stirring assembly (15) comprises a stirring frame (31), an annular opening is provided on the outer side of the bottom of the shell (2), the shell (2) is divided into an upper section and a lower section through the annular opening, a fixing frame (32) for connecting and fixing the upper section and the lower section of the shell (2) is provided on the outer side of the annular opening, a rotating ring (33) is rotatably provided in the annular opening, the bottom end of the rotating shaft (28) passes through the mounting frame (27) and is rotatably connected to the fixing frame (32), an auxiliary gear (34) is fixedly provided on the outer side of the bottom end of the rotating shaft (28), and an annular tooth meshing with the auxiliary gear (34) is provided on the outer side of the rotating ring (33), and a plurality of stirring frames (31) are provided, and the plurality of stirring frames (31) are evenly fixed on the inner side of the rotating ring (33).

8. The metal 3D printer nozzle according to claim 1, characterized in that: The lower section of the shell (2) is a conical cylinder extending from the shell (2) to the nozzle (3).

9. A metal 3D printer nozzle according to claim 7, characterized in that: A scraper (35) is fixedly provided at the bottom of the stirring frame (31), and the scraper (35) is slidably matched with the inner side of the shell (2).

10. The metal 3D printer nozzle according to claim 1, characterized in that: The feed assembly (6) comprises a feed pipe (36), a fixed pipe (37) is connected to the outside of the shell (2), an auxiliary motor (38) is fixedly provided at one end of the fixed pipe (37) away from the shell (2), a second extrusion rod (39) is rotatably provided in the fixed pipe (37), an output end of the auxiliary motor (38) is fixed to the second extrusion rod (39), and the feed pipe (36) is fixedly provided at the top of the fixed pipe (37).

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