Metal powder spreading mechanism and 3D printing device

Abstract

The invention discloses a metal powder laying mechanism and a 3D printing device, relates to the technical field of metal powder processing, and aims to solve the technical problems that a traditional 3D printing device is low in functionality and difficult to lay multiple metal powder in a single layer, and the metal powder laying mechanism comprises a double-shaft moving assembly, an L-shaped seat, a driving assembly and a powder laying assembly. The round material cavity and the annular material cavity are designed in a separated mode, different metal powder can be stored, when the semi-cylinder rotates to be in an inclined state, the pre-storage material groove A and the pre-storage material groove B are both communicated with the outside, the semi-cylinder and the convex column form a strickling state, the driving assembly is used for driving the semi-cylinder to rotate, synchronous laying of various metal powder in a single layer is completed, and the working efficiency is improved. When the semi-cylinder rotates to the horizontal state, the bottom face of the semi-cylinder is flush with the bottom face of the convex column, the semi-cylinder and the convex column form a compaction state, the convex column and the semi-cylinder are driven by the double-shaft moving assembly to descend, the stricken metal powder is compacted, gaps of the metal powder are reduced, and the density of the metal powder is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal powder processing, and more particularly to a metal powder spreading mechanism and a 3D printing device. Background Art

[0002] 3D printing, a highly innovative additive manufacturing technology, has seen widespread application in numerous fields in recent years. From the high-precision manufacturing of complex parts in the aerospace sector, to the rapid production of personalized parts in the automotive industry, to the manufacture of customized implants in the biomedical field, 3D printing is reshaping the traditional manufacturing landscape with its numerous advantages, including the ability to process complex shapes, significantly shorten manufacturing cycles, improve material utilization, and ensure part precision. In the 3D metal printing process, the metal powder spreading step is crucial, and its quality directly impacts the performance and precision of the final printed part.

[0003] In fields such as aerospace and high-end manufacturing, many key components require a combination of the properties of different metals, such as high strength and corrosion resistance, thermal conductivity and insulation. Traditional 3D printing devices have low functionality and find it difficult to lay a single layer of multiple metal powders. In view of this, we propose a metal powder laying mechanism and a 3D printing device. Summary of the Invention

[0004] The purpose of the present invention is to provide a metal powder spreading mechanism and a 3D printing device to solve the technical problem that traditional 3D printing devices have low functionality and are difficult to achieve single-layer laying of multiple metal powders.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a metal powder spreading mechanism, a metal powder spreading mechanism, comprising a biaxial moving assembly, an L-shaped seat fixedly provided at the movable end of the biaxial moving assembly, a driving assembly provided on the L-shaped seat, and a powder spreading assembly provided at the movable end of the driving assembly; The powder spreading component includes a convex column and a powder spreading unit; the convex column has an internal and external structure with a circular material cavity and an annular material cavity, the bottom of the convex column is provided with a semicircular groove, the bottom of the circular material cavity is provided with a discharge trough A connected with the semicircular groove, and both sides of the bottom of the circular material cavity are provided with discharge troughs B connected with the semicircular groove; the powder spreading unit includes a semi-cylinder, the semi-cylinder is rotatably arranged on the semi-circular groove, the middle of the semi-cylinder is provided with a pre-storage trough A, and both sides of the discharge trough A are provided with pre-storage trough B; when the semi-cylinder rotates to an inclined state, the pre-storage trough A and the pre-storage trough B are connected with the outside world, and the semi-cylinder and the convex column form a scraping shape; when the semi-cylinder rotates to a horizontal state, the bottom surface of the semi-cylinder is flush with the bottom surface of the convex column, the discharge trough A and the discharge trough B are connected with the pre-storage trough A and the pre-storage trough B respectively, and the semi-cylinder and the convex column form a compacted shape. The present invention can store different metal powders separately by designing the circular material cavity and the annular material cavity in the convex column. When the semi-cylinder rotates to an inclined state, the pre-storage trough A and the pre-storage trough B are both connected to the outside world, and the semi-cylinder and the convex column form a scraped shape. The driving component is used to drive the rotation to complete the synchronous laying of multiple metal powders in a single layer, meeting the requirements of complex parts for multi-material composite performance. When the semi-cylinder rotates to a horizontal state, the bottom surface of the semi-cylinder is flush with the bottom surface of the convex column, and the semi-cylinder and the convex column form a compacted shape. The dual-axis moving component is used to drive the convex column and the semi-cylinder to descend, and the scraped metal powder is compacted, thereby reducing the gap between the metal powders and effectively improving the metal powder density, thereby solving the technical problem that traditional 3D printing devices have low functionality and are difficult to achieve single-layer laying of multiple metal powders.

[0006] Preferably, a shaking arc groove is provided on one side of the vertical portion of the L-shaped seat, and a rotating groove is provided on the bottom end of the horizontal portion of the L-shaped seat.

[0007] Preferably, the driving assembly includes a motor A, a connecting shaft, a mounting block and a shaking unit; the motor A is fixedly mounted on the top of the transverse part of the L-shaped seat, the connecting shaft is rotatably mounted on the transverse part of the L-shaped seat and is fixedly connected to the output shaft of the motor A, the bottom end of the connecting shaft passes through the bottom end of the transverse part of the L-shaped seat and is fixedly provided with a round block, the bottom end of the round block is provided with a movable groove at an eccentric position, the mounting block is rotatably mounted on the round block, the bottom end of the mounting block is provided with a mounting cavity, the shaking unit is provided in the mounting cavity, the top end of the shaking unit is movably connected to the movable groove, the connecting shaft is connected to the rotating groove through the rotating unit, and the bottom end of the rotating unit is fixedly connected to the bottom end of the mounting block; when the connecting shaft rotates forward, the connecting shaft drives the mounting block to rotate through the rotating unit, and the shaking unit rotates accordingly. When the connecting shaft rotates reversely, the rotating unit cannot rotate, and the round block rotates relative to the shaking unit, causing the shaking unit to shake.

[0008] Preferably, the shaking unit includes a rotating rod A, which is fixed at the bottom end of the mounting cavity. A U-shaped seat is rotatably provided on the rotating rod A, a rotating rod B is fixed at the top of the U-shaped seat, a ring is movably provided on the rotating rod B, a movable column is rotatably provided at the top of the ring, and the movable column is movably connected to the movable groove.

[0009] Preferably, the rotating unit includes a ring block, which is rotatably provided on the connecting shaft and rotatably connected to the rotating groove. A number of triangular grooves A are evenly provided on the inner edge surface of the ring block, and the depth of the triangular groove A gradually decreases in the clockwise direction. A limiting column A movably provided on the triangular groove A is movably connected to the surface of the connecting shaft, and the limiting column A is elastically connected to the deep part of the triangular groove A through a spring A. A number of triangular grooves B are evenly provided on the outer edge surface of the ring block, and the depth of the triangular groove B gradually decreases in the clockwise direction. A limiting column B movably provided on the triangular groove B is movably connected to the surface of the rotating groove, and the limiting column B is elastically connected to the deep part of the triangular groove B through a spring B.

[0010] Preferably, the convex column is fixed to the bottom end of the U-shaped seat, and a material hole A and a material hole B are provided at the top of the convex column. The material hole A and the material hole B are respectively connected to the circular material cavity and the annular material cavity. Rotating arc grooves are provided at both ends of the semicircular groove, and rotating arc blocks movably connected to the rotating arc grooves are fixed at both ends of the semi-cylinder. An arc notch is also provided at one end of the semicircular groove, and a rotating cavity is connected to the top of the arc notch. A mounting groove is provided at the bottom of the outer edge surface of the convex column.

[0011] Preferably, an annular groove is provided in the middle of the outer edge surface of the convex column, a swivel is rotatably connected to the annular groove, a connecting block is fixed on the swivel, and a shaking arc block movably connected to the shaking arc groove is fixed on the connecting block.

[0012] Preferably, the volume of the pre-storage tank A and the pre-storage tank B gradually increases along the eccentric direction.

[0013] Preferably, the powder spreading unit also includes a partial gear ring, a gear and a motor B. The partial gear ring is arranged in the arc groove and is fixedly connected to the semi-cylinder. The gear is arranged in the rotating chamber and is meshed with the partial gear ring. A rotating rod is fixed on the gear and is rotatably connected to the rotating chamber. The motor B is fixed on the mounting groove. The rotating rod penetrates the mounting groove and is fixedly connected to the output shaft of the motor B.

[0014] A 3D printing device includes the above-mentioned metal powder spreading mechanism.

[0015] The beneficial effects of the present invention are: 1. The present invention can store different metal powders separately by designing the circular material cavity and the annular material cavity in the convex column. When the semi-cylinder rotates to an inclined state, the pre-storage trough A and the pre-storage trough B are connected to the outside world, and the semi-cylinder and the convex column form a scraped shape. The driving component is used to drive the rotation to complete the synchronous laying of multiple metal powders in a single layer, meeting the requirements of complex parts for multi-material composite performance. When the semi-cylinder rotates to a horizontal state, the bottom surface of the semi-cylinder is flush with the bottom surface of the convex column, and the semi-cylinder and the convex column form a compacted shape. The dual-axis moving component is used to drive the convex column and the semi-cylinder to descend, and the scraped metal powder is compacted, thereby reducing the gap between the metal powders and effectively improving the metal powder density. This solves the technical problem that traditional 3D printing devices have low functionality and are difficult to achieve single-layer laying of multiple metal powders.

[0016] 2. The present invention also designs the overall volume gradient of the discharge trough A and the discharge trough B, so that the outer area corresponds to a larger discharge volume and the central area corresponds to a smaller discharge volume, so that the metal powder is relatively uniform after being scraped flat.

[0017] 3. The present invention also makes the powder spreading component have two motion states of shaking and rotating scraping through the structural design of the driving component and the powder spreading component. The "pre-storage-powder spreading-scraping-compacting" process can be completed without additional equipment, shortening the process time and improving processing efficiency. The shaking action of the powder spreading component makes the pre-storage amount of metal powder in the pre-storage trough A and the pre-storage trough B relatively accurate, thereby improving the functionality of the 3D printing device, thereby further improving the uniformity of the subsequent metal powder after scraping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention.

[0020] Figure 3 for Figure 2 A-part structure enlarged schematic diagram.

[0021] Figure 4 It is a structural schematic diagram of the metal powder spreading mechanism of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the L-shaped seat, drive assembly and powder spreading assembly of the present invention.

[0023] Figure 6 It is a schematic diagram of the disassembled structure of the powder spreading component of the present invention.

[0024] Figure 7 It is a schematic diagram of the cross-sectional structure of the convex column of the present invention.

[0025] Figure 8 It is a structural schematic diagram of the powder spreading unit of the present invention.

[0026] Figure 9 for Figure 8 An enlarged schematic diagram of the structure of part B.

[0027] Figure 10 It is a partial structural cross-sectional schematic diagram of the L-shaped seat, drive assembly and powder spreading assembly of the present invention.

[0028] Figure 11 It is a partial structural cross-sectional schematic diagram of the drive assembly of the present invention.

[0029] Figure 12 It is a schematic diagram of the partial structural breakdown of the drive assembly of the present invention.

[0030] Figure 13 It is a schematic cross-sectional structural diagram of the rotating unit of the present invention.

[0031] Description of the numbers in the figure: 1. Dual-axis moving assembly; 2. L-shaped seat; 3. Drive assembly; 4. Powder spreading assembly; 5. Printer body; 6. Lifting mechanism; 11. X-axis moving unit; 12. Y-axis moving unit; 21. Shaking arc slot; 22. Rotating slot; 31. Motor A; 32. Coupling; 33. Round block; 34. Mounting block; 35. Shaking unit; 36. Rotating unit; 331, activity slot; 341, installation cavity; 351. Rotating rod A; 352. U-shaped seat; 353. Rotating rod B; 354. Ring; 355. Movable column; 361, ring block; 362, triangular groove A; 363, limit column A; 364, spring A; 365, triangular groove B; 366, limit column B; 367, spring B; 41. Convex column; 42. Ring groove; 43. Rotating ring; 44. Connecting block; 45. Shaking arc block; 46. Powder spreading unit; 410, circular material cavity; 411, annular material cavity; 412, semicircular groove; 413, arc notch groove; 414, rotating cavity; 415, mounting groove; 416, discharge groove A; 417, discharge groove B; 418, rotating arc groove; 461. Semi-cylinder; 462. Pre-storage trough A; 463. Pre-storage trough B; 464. Rotating arc block; 465. Partial gear ring; 466. Gear; 467. Motor B; 50. Printing table; 51. Column slot; 52. Empty slot A; 53. Slide slot; 54. Motor slot; 61. Motor C; 62. Screw A; 64. Sliding rod; 63. Threaded tube. DETAILED DESCRIPTION

[0032] like Figures 1 to 13 As shown, the present invention relates to a metal powder spreading mechanism, which includes a dual-axis moving component 1, an L-shaped seat 2, a driving component 3 and a powder spreading component 4.

[0033] In the embodiment of the present invention, reference Figure 4 As shown, the dual-axis moving assembly 1 includes an X-axis moving unit 11, and a Y-axis moving unit 12 is fixed to the movable end of the X-axis moving unit 11. The X-axis moving unit 11 and the Y-axis moving unit 12 of the present invention are both screw moving structures, which are prior art and will not be described in detail here.

[0034] In the embodiment of the present invention, referring to Figure 10 As shown, the L-shaped seat 2 is fixed to the movable end of the Y-axis moving unit 12 , a shaking arc groove 21 is opened on one side of the vertical portion of the L-shaped seat 2 , and a rotating groove 22 is opened on the bottom end of the horizontal portion of the L-shaped seat 2 .

[0035] In the embodiment of the present invention, referring to Figure 10 、 Figure 11 、 Figure 12 and Figure 13 As shown, the driving assembly 3 includes a motor A31 , a connecting shaft 32 , a mounting block 34 and a shaking unit 35 .

[0036] In an embodiment of the present invention, the motor A31 is fixedly arranged at the top of the transverse part of the L-shaped seat 2, the connecting shaft 32 is rotatably arranged at the transverse part of the L-shaped seat 2 and is fixedly connected to the output shaft of the motor A31, the bottom end of the connecting shaft 32 passes through the bottom end of the transverse part of the L-shaped seat 2 and is fixedly provided with a round block 33, and a movable groove 331 is provided at the eccentric position of the bottom end of the round block 33, the mounting block 34 is rotatably arranged on the round block 33, and a mounting cavity 341 is provided at the bottom end of the mounting block 34, and the shaking unit 35 is arranged in the mounting cavity 341, and the top end of the shaking unit 35 is movably connected to the movable groove 331, the connecting shaft 32 is connected to the rotating groove 22 through the rotating unit 36, and the bottom end of the rotating unit 36 ​​is fixedly connected to the bottom end of the mounting block 34, so that when the connecting shaft 32 rotates forward, the connecting shaft 32 drives the mounting block 34 to rotate through the rotating unit 36, and the shaking unit 35 rotates accordingly. When the connecting shaft 32 rotates reversely, the rotating unit 36 ​​cannot rotate, and the round block 33 rotates relative to the shaking unit 35, causing the shaking unit 35 to shake.

[0037] In an embodiment of the present invention, the shaking unit 35 includes a rotating rod A351, which is fixed at the bottom end of the mounting cavity 341. A U-shaped seat 352 is rotatably provided on the rotating rod A351. A rotating rod B353 is fixed at the top end of the U-shaped seat 352. A collar 354 is movably provided on the rotating rod B353. A movable column 355 is rotatably provided at the top end of the collar 354. The movable column 355 is movably connected to the movable groove 331. The present invention arranges the structure of the shaking unit 35 so that in the initial position, the U-shaped seat 352 is in a vertical state. When the round block 33 rotates relative to the shaking unit 35, the movable groove 331 rotates, causing the movable column 355 to move relative to the movable groove 331. The collar 354 moves relative to the rotating rod B353, causing the U-shaped seat 352 to rotate back and forth relative to the rotating rod A351 to form a shaking motion.

[0038] In an embodiment of the present invention, the rotating unit 36 ​​includes a ring block 361, which is rotatably provided on the connecting shaft 32 and rotatably connected to the rotating groove 22. A number of triangular grooves A362 are evenly provided on the inner edge surface of the ring block 361, and the depth of the triangular groove A362 gradually decreases in the clockwise direction. A limiting column A363 is movably provided on the triangular groove A362 and movably connected to the surface of the connecting shaft 32. The limiting column A363 is elastically connected to the deep part of the triangular groove A362 through a spring A364. A number of triangular grooves B365 are evenly provided on the outer edge surface of the ring block 361, and the depth of the triangular groove B365 gradually decreases in the clockwise direction. A limiting column B366 is movably provided on the triangular groove B365 and movably connected to the surface of the rotating groove 22. The limiting column B366 is elastically connected to the deep part of the triangular groove B365 through a spring B367. The present invention adopts the structural design of the rotating unit 36, so that when the connecting shaft 32 rotates in the forward direction, the friction force of the connecting shaft 32 on the limiting column A363 causes the limiting column A363 to move toward the shallow part of the triangular groove A362, causing the connecting shaft 32 to be locked with the triangular groove A362 through the limiting column A363, thereby causing the connecting shaft 32 to drive the ring block 361 to rotate in the forward direction, and the friction force of the rotating groove 22 on the limiting column B366 causes the limiting column B366 to move toward the deep part of the triangular groove B365, so that the ring block 361 drives the mounting block 34 and the entire shaking unit 35 to rotate. According to the above principle, it can be seen that the ring block 361 cannot rotate reversely relative to the rotating groove 22, but the connecting shaft 32 can rotate reversely relative to the ring block 361. When the connecting shaft 32 rotates reversely, the round block 33 rotates relative to the shaking unit 35, causing the shaking unit 35 to shake.

[0039] In an embodiment of the present invention, Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the powder spreading assembly 4 includes a convex column 41 and a powder spreading unit 46 .

[0040] In the embodiment of the present invention, the convex column 41 is fixed to the bottom end of the U-shaped seat 352, and the convex column 41 has an internal and external structure with a circular material cavity 410 and an annular material cavity 411. The top of the convex column 41 is provided with a material hole A and a material hole B, and the material hole A and the material hole B are respectively connected to the circular material cavity 410 and the annular material cavity 411. The bottom end of the convex column 41 is provided with a semicircular groove 412, and the bottom end of the circular material cavity 410 is provided with a discharge groove connected to the semicircular groove 412. A416, a discharge trough B417 is provided on both sides of the bottom end of the circular cavity 410, connected to the semicircular groove 412. The discharge trough A416 and the two discharge troughs B417 are aligned. The semicircular groove 412 has a rotating arc groove 418 at both ends. The semicircular groove 412 also has an arc-shaped notch 413 at one end. The top of the arc-shaped notch 413 is connected to the rotating cavity 414. The bottom of the outer edge of the convex column 41 has a mounting groove 415. The circular cavity 410 and the annular cavity 411 of the present invention are used to store the same or different metal powders.

[0041] In an embodiment of the present invention, to enhance the stability of the convex column 41, an annular groove 42 is formed in the middle of the outer edge of the convex column 41. A swivel ring 43 is rotatably connected to the annular groove 42. A connecting block 44 is fixed to the swivel ring 43. A swivel arc block 45 is fixed to the connecting block 44 and is movably connected to the swivel arc groove 21. This allows the convex column 41 to rotate relative to the swivel ring 43 when it rotates. When the convex column 41 shakes, the swivel ring 43, the connecting block 44, and the swivel arc block 45 are driven to reciprocate relative to the swivel arc groove 21.

[0042] In an embodiment of the present invention, the powder spreading unit 46 includes a semi-cylinder 461, a partial gear ring 465, a gear 466 and a motor B467. The semi-cylinder 461 is rotatably arranged on the semi-circular groove 412. A pre-storage trough A462 is provided in the middle of the semi-cylinder 461 and is communicated with and cooperates with the discharge trough A416. Pre-storage troughs B463 are provided on both sides of the discharge trough A416 and are communicated with and cooperate with the discharge trough B417. Rotating arc blocks 464 movably connected to the rotating arc groove 418 are fixed at both ends of the semi-cylinder 461. The partial gear ring 465 is provided in the arc groove 413 and is fixedly connected to the semi-cylinder 461. The gear 466 is provided in the rotating cavity 414 and is meshed with the partial gear ring 465. A rotating rod rotatably connected to the rotating cavity 414 is fixed on the gear 466. The motor B467 is fixed on the mounting groove 415. The rotating rod penetrates the mounting groove 415 and is fixedly connected to the output shaft of the motor B467. The present invention adopts the above arrangement, so that the output shaft of the motor B467 rotates and drives the gear 466 to rotate, so that the partial gear ring 465 drives the semi-cylinder 461 to rotate, as shown in FIG. Figure 6As shown, when the semi-cylinder 461 rotates to an inclined state, the pre-storage trough A462 and the pre-storage trough B463 are both connected to the outside world, and the semi-cylinder 461 and the convex column 41 form a scraping shape, and the metal powder falls from the pre-storage trough A462 and the pre-storage trough B463 respectively. The convex column 41 is driven to rotate by the rotational motion state of the driving component 3 to scrape the metal powder flat. When the semi-cylinder 461 rotates to a horizontal state, the bottom surface of the semi-cylinder 461 is flush with the bottom surface of the convex column 41, and the discharge trough A416 and the discharge trough are aligned. Groove B417 is connected to the pre-storage groove A462 and the pre-storage groove B463 respectively. The semi-cylinder 461 and the convex column 41 form a compacted form. The drive component 3 and the convex column 41 are driven down by the Y-axial moving unit 12 to compact the scraped metal powder, reduce the gap between the metal powders, and effectively increase the density of the metal powder, thereby improving the mechanical strength of the formed workpiece. When the circular material cavity 410 and the ring material cavity 411 are used to place the same or different metal powders, the paving of a single layer of multiple metal powders is completed.

[0043] In an embodiment of the present invention, Figure 8 As shown, the volume of both pre-storage trough A462 and pre-storage trough B463 gradually increases along the eccentric direction. The present invention utilizes a gradient design for the overall volume of discharge troughs A416 and B417, resulting in a larger discharge volume in the outer regions and a smaller discharge volume in the central regions, ensuring a relatively uniform distribution of metal powder after scraping.

[0044] In an embodiment of the present invention, Figure 2 As shown, a 3D printing device includes the above-mentioned metal powder spreading mechanism, and also includes a printer body 5. The printer body 5 is provided with a cylindrical groove 51 adapted to the bottom of the convex column 41, and the cylindrical groove 51 is slidably provided with a printing table 50. The printer body 5 is provided with a lifting mechanism 6 for driving the printing table 50 to rise and fall.

[0045] In an embodiment of the present invention, Figure 3 As shown, an empty slot A52 is opened at the bottom end of the cylindrical slot 51, a plurality of sliding slots 53 are evenly opened around the empty slot A52, and a motor slot 54 is opened below the empty slot A52.

[0046] The lifting mechanism 6 includes a motor C61, a screw rod A62, and several slide rods 64. The motor C61 is fixed on the motor slot 54, the screw rod A62 is rotatably set on the empty slot A52, and a threaded tube 63 is threadedly connected to the screw rod A62. The top of the threaded tube 63 is fixedly connected to the bottom end of the printing table 50, and the slide rod 64 is fixed on the bottom end of the printing table 50. Several slide rods 64 are respectively slidably connected to several slide slots 53.

[0047] Working Principle: This embodiment provides a metal powder spreading mechanism and a 3D printing device. When in use, the X-axis moving unit 11 and the Y-axis moving unit 12 of the dual-axis moving assembly 1 drive the L-shaped seat 2 and subsequent components to achieve precise displacement in the X and Y directions on the horizontal plane. By controlling the motor A31 to control the coupling shaft 32 to rotate in the opposite direction, the rotating unit 36 ​​cannot drive the ring block 361 to rotate, and the round block 33 rotates eccentrically relative to the shaking unit 35. Through the linkage of the movable groove 331, the movable column 355 and the collar 354, the U-shaped seat 352 rotates back and forth around the rotating rod A351, realizing the shaking action of the powder spreading assembly 4, thereby ensuring that the pre-stocked amount of metal powder in the pre-stocking trough A462 and the pre-stocking trough B463 is relatively accurate; Move the convex column 41 to the top of the cylindrical groove 51, and control the rotation of the output shaft of the motor B467 to rotate the semi-cylinder 461 to a tilted state. The pre-storage trough A462 and the pre-storage trough B463 are connected to the outside world, and the metal powder in the pre-storage trough A462 and the pre-storage trough B463 falls into the cylindrical groove 51. The semi-cylinder 461 and the convex column 41 form a scraped flat state. By controlling the motor A31 to control the connecting shaft 32 to rotate in the forward direction, the limiting column A363 of the rotating unit 36 ​​is locked with the triangular groove A362 of the ring block 361, driving the ring block 361 to rotate synchronously, so that the mounting block 34, the shaking unit 35 and the powder spreading assembly 4 rotate as a whole, and the semi-cylinder 461 scrapes the powder flat; By controlling the rotation of the output shaft of the motor B467, when the semi-cylinder 461 rotates to a horizontal state, its bottom surface is flush with the bottom surface of the convex column 41, and the discharge trough A416 and the discharge trough B417 are connected to the pre-storage trough A462 and the pre-storage trough B463 respectively. The semi-cylinder 461 and the convex column 41 form a compacted form, and the Y-axial moving unit 12 drives the driving component 3 and the convex column 41 to descend, compacting the scraped metal powder, reducing the gap between the metal powder and effectively improving the density of the metal powder. The powder spreading assembly 4 is restored to its initial position, and the shaking action of the powder spreading assembly 4 is repeated, and the printer body 5 prints the compacted metal powder; Repeat the above steps to complete the printing of metal powder.

[0048] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A metal powder spreading mechanism, characterized in that: It comprises a biaxial moving assembly (1), wherein an L-shaped seat (2) is fixedly provided at a movable end of the biaxial moving assembly (1), a driving assembly (3) is provided on the L-shaped seat (2), and a powder spreading assembly (4) is provided at a movable end of the driving assembly (3); The powder spreading component (4) includes a convex column (41) and a powder spreading unit (46); The convex column (41) has an inner and outer structure with a circular material cavity (410) and an annular material cavity (411). The bottom end of the convex column (41) is provided with a semicircular groove (412). The bottom end of the circular material cavity (410) is provided with a discharge groove A (416) communicating with the semicircular groove (412). Discharge grooves B (417) communicating with the semicircular groove (412) are provided on both sides of the bottom end of the circular material cavity (410). The powder spreading unit (46) includes a semi-cylinder (461) rotatably mounted on the semi-circular groove (412), a pre-storage groove A (462) is provided in the middle of the semi-cylinder (461), and pre-storage grooves B (463) are provided on both sides of the discharge groove A (416); When the semi-cylinder (461) rotates to an inclined state, the pre-storage trough A (462) and the pre-storage trough B (463) are both connected to the outside world, and the semi-cylinder (461) and the convex column (41) form a scraping shape; When the semi-cylinder (461) rotates to a horizontal state, the bottom surface of the semi-cylinder (461) is flush with the bottom surface of the convex column (41), the discharge trough A (416) and the discharge trough B (417) are connected to the pre-storage trough A (462) and the pre-storage trough B (463) respectively, and the semi-cylinder (461) and the convex column (41) form a compacted shape.

2. The metal powder spreading mechanism according to claim 1, characterized in that: A shaking arc groove (21) is provided on one side of the vertical portion of the L-shaped seat (2), and a rotating groove (22) is provided on the bottom end of the horizontal portion of the L-shaped seat (2).

3. The metal powder spreading mechanism according to claim 2, characterized in that: The driving assembly (3) includes a motor A (31), a connecting shaft (32), a mounting block (34) and a shaking unit (35); The motor A (31) is fixedly mounted on the top of the transverse portion of the L-shaped seat (2); the connecting shaft (32) is rotatably mounted on the transverse portion of the L-shaped seat (2) and is fixedly connected to the output shaft of the motor A (31); the bottom end of the connecting shaft (32) passes through the bottom end of the transverse portion of the L-shaped seat (2) and is fixedly provided with a round block (33); a movable groove (331) is provided at an eccentric position at the bottom end of the round block (33); the mounting block (34) is rotatably mounted on the round block (33); a mounting cavity (341) is provided at the bottom end of the mounting block (34); the shaking unit (35) is disposed in the mounting cavity (341); the top end of the shaking unit (35) is movably connected to the movable groove (331); the connecting shaft (32) is connected to the rotating groove (22) via a rotating unit (36); the bottom end of the rotating unit (36) is fixedly connected to the bottom end of the mounting block (34); When the connecting shaft (32) rotates in the forward direction, the connecting shaft (32) drives the mounting block (34) to rotate through the rotating unit (36), and the shaking unit (35) rotates accordingly. When the connecting shaft (32) rotates in the reverse direction, the rotating unit (36) cannot rotate, and the round block (33) rotates relative to the shaking unit (35), causing the shaking unit (35) to shake.

4. The metal powder spreading mechanism according to claim 3, characterized in that: The shaking unit (35) includes a rotating rod A (351), the rotating rod A (351) is fixedly arranged at the bottom end of the installation cavity (341), a U-shaped seat (352) is rotatably provided on the rotating rod A (351), a rotating rod B (353) is fixedly provided at the top end of the U-shaped seat (352), a collar (354) is movably provided on the rotating rod B (353), a movable column (355) is rotatably provided at the top end of the collar (354), and the movable column (355) is movably connected to the movable groove (331).

5. The metal powder spreading mechanism according to claim 3, characterized in that: The rotating unit (36) includes a ring block (361), the ring block (361) is rotatably arranged on the connecting shaft (32) and is rotatably connected to the rotating groove (22), a plurality of triangular grooves A (362) are evenly opened on the inner edge surface of the ring block (361), the groove depth of the triangular grooves A (362) gradually decreases in the clockwise direction, and a limiting column A (363) movably arranged on the triangular groove A (362) and movably connected to the surface of the connecting shaft (32), the limiting column A (363) The ring block (361) is elastically connected to the deep part of the triangular groove A (362) through a spring A (364). A plurality of triangular grooves B (365) are evenly formed on the outer edge surface of the ring block (361). The depth of the triangular groove B (365) gradually decreases in the clockwise direction. A limiting column B (366) is movably provided on the triangular groove B (365) and is movably connected to the surface of the rotating groove (22). The limiting column B (366) is elastically connected to the deep part of the triangular groove B (365) through a spring B (367).

6. The metal powder spreading mechanism according to claim 4, characterized in that: The convex column (41) is fixed at the bottom end of the U-shaped seat (352), and a material hole A and a material hole B are provided at the top end of the convex column (41), and the material hole A and the material hole B are respectively connected to the circular material cavity (410) and the annular material cavity (411), and a rotating arc groove (418) is provided at both ends of the semicircular groove (412), and a rotating arc block (464) movably connected to the rotating arc groove (418) is fixed at both ends of the semicircular column (461), and an arc notch groove (413) is further provided at one end of the semicircular groove (412), and the top end of the arc notch groove (413) is connected to the rotating cavity (414), and a mounting groove (415) is provided at the bottom of the outer edge surface of the convex column (41).

7. The metal powder spreading mechanism according to claim 2, characterized in that: An annular groove (42) is provided in the middle of the outer edge surface of the convex column (41), a rotating ring (43) is rotatably connected to the annular groove (42), a connecting block (44) is fixedly provided on the rotating ring (43), and a shaking arc block (45) movably connected to the shaking arc groove (21) is fixedly provided on the connecting block (44).

8. The metal powder spreading mechanism according to claim 6, characterized in that: The volume of the pre-storage tank A (462) and the pre-storage tank B (463) both gradually increases along the eccentric direction.

9. The metal powder spreading mechanism according to claim 6, characterized in that: The powder spreading unit (46) further includes a partial toothed ring (465), a gear (466) and a motor B (467), wherein the partial toothed ring (465) is arranged in the arc notch (413) and is fixedly connected to the semi-cylinder (461), the gear (466) is arranged in the rotating chamber (414) and is meshedly connected to the partial toothed ring (465), the gear (466) is fixedly provided with a rotating rod rotatably connected to the rotating chamber (414), the motor B (467) is fixedly arranged on the mounting groove (415), the rotating rod penetrates the mounting groove (415) and is fixedly connected to the output shaft of the motor B (467).

10. A 3D printing device, characterized in that: It comprises the metal powder spreading mechanism as described in any one of claims 1-9.

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