Powder taking device for melting of laser powder bed for 3D printing

Abstract

The utility model discloses a 3D printing laser powder bed melting powder taking device, and relates to the technical field of 3D printing, the 3D printing laser powder bed melting powder taking device comprises a powder containing box, the bottom end of the powder containing box is communicated with a discharging pipe, the upper end of the powder containing box is tightly attached to a box cover, a filter screen is arranged in the powder containing box in a sliding mode, and the filter screen is fixedly arranged on a mounting shaft; a crushing mechanism is arranged on the filter screen, material taking rollers are symmetrically and rotationally arranged in the discharging pipe, a plurality of material taking grooves are formed in the material taking rollers in a circular array mode, and adjusting mechanisms are arranged in the material taking grooves. The scraping rod is tightly attached to the upper end of the filter screen so that caked metal powder can be conveniently intercepted and crushed, meanwhile, the material taking rollers are symmetrically arranged in the discharging pipe, the adjusting plates are arranged in the material taking groove in a sliding mode, the material taking capacity of the material taking groove is adjusted through the adjusting mechanism, and therefore quantitative adjustment material taking is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, specifically to a powder extraction device for laser powder bed melting in 3D printing. Background Technology

[0002] Additive manufacturing, also known as 3D printing, is an emerging manufacturing technology that uses digital models as a basis to build up materials layer by layer to create physical objects. Additive manufacturing equipment can directly build solid parts "from scratch," without following the traditional processes of blanking, roughing, and finishing, and without relying on special forming molds. It has advantages such as design freedom, manufacturing flexibility, low cost, and short cycle time. Laser powder bed melting is one of the most common technologies in metal additive manufacturing. It uses a laser energy source to selectively melt granular materials such as metals, ceramics, or polymers together according to the model to form a three-dimensional object. First, a layer of powder material is laid on the powder bed through the powder picking and spreading mechanism. The laser energy source selectively melts and sintersects the current layer of powder material together according to the model. Then, the substrate is lowered by one layer thickness, and the powder is evenly and flatly spread on the powder bed. Then, the laser selectively melts and sintersects again. This process is repeated to print three-dimensional objects layer by layer. However, different parts use different powders when they are made. During the powder picking process of existing 3D printers, due to various reasons, air comes into contact with the powdered metal, which will cause agglomeration. This will affect the quality of 3D printing, and the powder picking device is not conducive to disassembly and maintenance.

[0003] The announcement number is CN214349621U, which discloses a powder collection mechanism for a 3D printer. Through the rotation of a drive motor and the engagement of a driving bevel gear and a driven bevel gear, the first screw rotates, the sliding block moves downwards, and the pressure plate pushes the powdered metal for powder dispensing. Simultaneously, the rotating shaft rotates, and the stirring rod stirs the powdered metal in the powder container to prevent clumping during powder collection. However, in this powder collection mechanism, the first screw is located inside the powder container, resulting in a significant amount of powder adhering to the screw during actual use. This causes considerable wear when the screw and sliding block engage, and the resulting powder mixes with the printing material, causing deviations in the composition of the printed parts from the design specifications. Furthermore, the powder collection mechanism uses a pressure plate to expel material, making it difficult to adjust the amount of material dispensed during actual use, thus limiting its practical application.

[0004] Based on this, a powder collection device for laser powder bed melting in 3D printing is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a powder collection device for laser powder bed melting in 3D printing, so as to solve the problem in the prior art that a lot of metal impurities are generated during operation, making it inconvenient to adjust the amount of material fed.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A powder collection device for laser powder bed melting in 3D printing includes a powder loading box, a discharge pipe connected to the bottom of the powder loading box, a box cover tightly attached to the top of the powder loading box, a filter screen slidingly disposed inside the powder loading box, a stop ring tightly attached to the bottom of the filter screen and fixedly disposed inside the powder loading box, the filter screen being fixedly disposed on a mounting shaft, one end of the mounting shaft being rotatably disposed inside a rotating hole at the top of the box cover, a crushing mechanism for crushing metal powder blocks being disposed on the filter screen, a material collection roller symmetrically rotating inside the discharge pipe, a plurality of material collection slots arranged in a circular array on the material collection roller, a drive assembly for driving the material collection roller to rotate being disposed on one side of the discharge pipe, and an adjustment mechanism for adjusting the material collection capacity of each material collection slot being disposed in each material collection slot.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative embodiment: the crushing mechanism includes scrapers, two of which are symmetrically arranged on a connecting shaft. Each scraper is in close contact with the outer side of the filter screen. The connecting shaft is coaxial with the mounting shaft and rotatably mounted in a mounting hole at the upper end of the housing cover. A first bevel gear is fixedly mounted on the mounting shaft, and a second bevel gear is fixedly mounted at one end of the connecting shaft. Both the first and second bevel gears mesh with a third bevel gear. The third bevel gear is fixedly mounted on the output end of a first motor. The first motor is fixedly mounted at the upper end of the housing cover. A feeding hole is provided at the upper end of the housing cover, and a sealing plug is fitted inside the feeding hole.

[0010] In one alternative: an inclined plate is fixedly provided on one side of the scraper, and the inclined plate is set at an angle.

[0011] In one alternative embodiment: the drive assembly includes worm gears, each worm gear is fixedly mounted on a rotating shaft at one end of the feed roller, and each worm gear is meshed with a worm. Rotating plates are rotatably mounted on rotating shafts at both ends of the worm, and the rotating plates are fixedly mounted on one side of the discharge pipe. One rotating shaft at one end of the worm is fixedly connected to the output end of a second motor, and the second motor is fixedly mounted on the upper end of a rotating plate. A sealing frame is fixedly mounted inside the discharge pipe, and the sealing frame is tightly fitted to the feed roller.

[0012] In one alternative embodiment: the adjusting mechanism includes adjusting plates, each of the material feeding troughs is slidably provided with an adjusting plate, each adjusting plate is hinged with a connecting rod at its bottom end, and the other end of each connecting rod is hinged to a mounting slide rod. The mounting slide rod is slidably provided in a sliding hole on one side of the material feeding roller, and the two mounting slide rods are respectively rotatably provided at both ends of the linkage frame. The linkage frame is fixedly provided on the output end of the electric push rod, and the electric push rod is fixedly provided on one side of the discharge pipe.

[0013] In one alternative: the mounting slide bar is provided with several scale lines.

[0014] In one alternative embodiment, a plurality of stirring rods are fixedly mounted on one end of the mounting shaft.

[0015] In one alternative: the powder box is symmetrically provided with mounting tubes, and each mounting tube is slidably provided with a stop frame. The stop frame is Z-shaped, and a tension spring is fixed between one side of the stop frame and one side inside the mounting tube. A pull rod is symmetrically provided at one end of the stop frame, and a limiting groove is provided at the corresponding position of the box cover and the other end of the stop frame.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention features a filter screen inside the powder loading box, with a scraper attached to the upper end of the screen to facilitate the interception and crushing of agglomerated metal powder. Simultaneously, symmetrically arranged material-collecting rollers with several material-collecting grooves inside the discharge pipe allow for the adjustment of the material-collecting capacity via an adjustment mechanism, facilitating quantitative material collection. Furthermore, the invention minimizes wear between components within the powder loading box, reducing impurities generated during operation and enhancing the practicality of the laser powder bed melting and powder collection device for 3D printing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the filter screen and feeding roller structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the installation of the mounting shaft and the sleeve shaft of this utility model.

[0021] Figure 4 This is a schematic diagram of the stop frame structure of this utility model.

[0022] Figure 5 This is a schematic diagram of the material take-up roller structure of this utility model.

[0023] Figure 6 This is a schematic diagram of the internal structure of the material taking roller of this utility model.

[0024] Figure 7 This is a schematic diagram of the scraper and inclined plate structure of this utility model.

[0025] Figure reference numerals: 11 Powder box, 12 Discharge pipe, 13 Box cover, 14 Filter screen, 15 Mounting shaft, 16 Scraper, 17 First bevel gear, 18 Inclined plate, 19 Sleeve shaft, 20 Second bevel gear, 21 First motor, 22 Feed roller, 23 Adjusting plate, 24 Connecting rod, 25 Mounting slide bar, 26 Electric push rod, 27 Worm gear, 28 Worm, 29 Second motor, 30 Stop frame, 31 Tension spring, 32 Mounting pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] In one embodiment, such as Figures 1-7 As shown, the powder collection device for laser powder bed melting in 3D printing includes a powder loading box 11. A discharge pipe 12 is connected to the bottom of the powder loading box 11. A box cover 13 is tightly attached to the top of the powder loading box 11. A filter screen 14 is slidably mounted inside the powder loading box 11. A stop ring is tightly attached to the bottom of the filter screen 14 and is fixedly mounted inside the powder loading box 11. The filter screen 14 is fixedly mounted on a mounting shaft 15. One end of the mounting shaft 15 is rotatably mounted inside a rotating hole at the top of the box cover 13. The filter screen 14... A crushing mechanism for crushing metal powder blocks is provided. A material receiving roller 22 is symmetrically rotated inside the discharge pipe 12. The material receiving roller 22 is provided with a plurality of material receiving grooves arranged in a circular array. A drive component for driving the material receiving roller 22 to rotate is provided on one side of the discharge pipe 12. Each material receiving groove is provided with an adjustment mechanism for adjusting the material receiving capacity of the groove. The crushing mechanism facilitates the crushing of agglomerated metal powder, and the adjustment mechanism facilitates the adjustment of the material receiving groove capacity, thereby adjusting the material discharge rate of the discharge pipe 12.

[0028] The crushing mechanism includes scraper rods 16, two of which are symmetrically arranged on a connecting shaft 19. Each scraper rod 16 is in close contact with the outer side of the filter screen 14. The connecting shaft 19 is coaxially arranged with a mounting shaft 15 and is rotatably mounted in a mounting hole at the upper end of the cover 13. A first bevel gear 17 is fixedly mounted on the mounting shaft 15, and a second bevel gear 20 is fixedly mounted on one end of the connecting shaft 19. Both the first bevel gear 17 and the second bevel gear 20 mesh with a third bevel gear, which is fixedly mounted on the output end of a first motor 21. The first motor 21 is fixedly mounted on the upper end of the cover 13, and a feeding hole is provided at the upper end of the cover 13. A sealing plug is fitted inside the feeding hole. When printing is required, the cover 13 is installed on the top of the powder box 11, and then metal powder is added into the powder box 11 through the feeding hole. The first motor 21 is started, and the output end of the first motor 21 drives the third bevel gear to rotate. The third bevel gear meshes with the first bevel gear 17 and the second bevel gear 20, so that the mounting shaft 15 and the sleeve shaft 19 rotate in opposite directions, which in turn makes the filter screen 14 and the scraper 16 rotate in opposite directions. When the filter screen 14 rotates, it can screen the metal powder inside the powder box 11. When the clump of metal powder is intercepted by the filter screen 14, the scraper 16 can break up the metal powder.

[0029] An inclined plate 18 is fixedly provided on one side of each scraper 16. The inclined plate 18 is inclined. When in use, when the scraper 16 touches the agglomerated metal powder block, the inclined plate 18 can restrict the movement of the powder block, thereby assisting the scraper 16 in breaking the powder block.

[0030] The drive assembly includes a worm gear 27. A worm gear 27 is fixedly mounted on the rotating shaft of one end of the feeding roller 22. A worm 28 is meshed on each worm gear 27. Rotating plates are rotatably mounted on the rotating shafts at both ends of the worm 28. The rotating plates are fixedly mounted on one side of the discharge pipe 12. One end of the rotating shaft of the worm 28 is fixedly connected to the output end of a second motor 29. The second motor 29 is fixedly mounted on the upper end of a rotating plate. A sealing frame is fixedly mounted inside the discharge pipe 12. The sealing frame is tightly fitted to the feeding roller 22. In use, when material needs to be collected, the two second motors 29 are activated, driving the feeding roller 22 to rotate. When the feeding groove on the feeding roller 22 aligns with the bottom of the powder box 11, the metal powder falls into the feeding groove, thus completing the quantitative material collection.

[0031] The adjustment mechanism includes an adjustment plate 23, which is slidably disposed within each of the feeding troughs. A connecting rod 24 is hinged to the bottom end of each adjustment plate 23, and the other end of each connecting rod 24 is hinged to a mounting slide rod 25. The mounting slide rod 25 is slidably disposed within a sliding hole on one side of the feeding roller 22. Two mounting slide rods 25 are rotatably disposed at both ends of a linkage frame. The linkage frame is fixedly disposed on the output end of an electric push rod 26, which is fixedly disposed on one side of the discharge pipe 12. In use, when the capacity of the feeding trough needs to be adjusted, the electric push rod 26 is activated. The output end of the electric push rod 26 drives the two mounting slide rods 25 to slide via the linkage frame. When the mounting slide rods 25 slide, they drive the adjustment plate 23 to slide within the feeding trough via the connecting rod 24, thereby adjusting the discharge rate of the discharge pipe 12.

[0032] The mounting slide bar 25 is provided with several scale lines, which makes it easy for the staff to determine the adjustment distance of the adjustment plate 23 when adjusting it.

[0033] Several stirring rods are fixedly provided at one end of the mounting shaft 15. When in use, they facilitate stirring of the powder after screening at the bottom of the powder box 11, thereby preventing the powder from arching.

[0034] The powder filling box 11 is symmetrically provided with mounting tubes 32. Each mounting tube 32 is slidably provided with a stop bracket 30. The stop bracket 30 is Z-shaped. A tension spring 31 is fixed between one side of the stop bracket 30 and the inside side of the mounting tube 32. A pull rod is symmetrically provided at one end of the stop bracket 30. The box cover 13 and the other end of the stop bracket 30 are provided with limiting grooves. When it is necessary to install the box cover 13 on the upper end of the powder filling box 11, the limiting groove is aligned with one end of the stop bracket 30, and then the box cover 13 is tightly attached to the upper end of the powder filling box 11. At the same time, the stop bracket 30 slides inside the mounting tube 32, so that the stop bracket 30 fixes the box cover 13.

[0035] The above embodiments disclose a powder collection device for laser powder bed melting in 3D printing. When printing material collection is required, the cover 13 is installed on the upper end of the powder collection box 11. Metal powder is then added into the powder collection box 11 through the feeding hole. The first motor 21 is started, and its output drives the third bevel gear to rotate. The third bevel gear meshes with the first bevel gear 17 and the second bevel gear 20, causing the mounting shaft 15 and the sleeve shaft 19 to rotate in opposite directions, thereby causing the filter screen 14 and the scraper 16 to rotate. In the opposite direction, when the filter screen 14 rotates, it can screen the metal powder inside the powder box 11. When the clumped metal powder is intercepted by the filter screen 14, the scraper 16 can break the metal powder and start the two second motors 29. The second motors 29 drive the feeding roller 22 to rotate. When the feeding groove on the feeding roller 22 is aligned with the bottom of the powder box 11, the metal powder falls into the feeding groove, thus completing the quantitative feeding. When the feeding groove rotates to the bottom position of the discharge pipe 12, the metal powder material inside the feeding groove falls out.

[0036] When the capacity of the feeding trough needs to be adjusted, the electric push rod 26 is activated. The output end of the electric push rod 26 drives the two mounting slide rods 25 to slide through the linkage frame. When the mounting slide rods 25 slide, they drive the adjusting plate 23 to slide in the feeding trough through the connecting rod 24, thereby adjusting the discharge amount of the discharge pipe 12.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A powder collection device for laser powder bed melting in 3D printing, comprising a powder loading box (11), wherein a discharge pipe (12) is connected to the bottom end of the powder loading box (11), a box cover (13) is tightly attached to the upper end of the powder loading box (11), and a filter screen (14) is slidably provided inside the powder loading box (11), characterized in that, The bottom end of the filter screen (14) is fitted with a stop ring, which is fixed inside the powder box (11). The filter screen (14) is fixed on the mounting shaft (15). One end of the mounting shaft (15) is rotatably located inside the rotating hole at the top of the box cover (13). The filter screen (14) is provided with a crushing mechanism for crushing metal powder blocks. The discharge pipe (12) is symmetrically rotated with a material taking roller (22). The material taking roller (22) is provided with a circular array of several material taking slots. The discharge pipe (12) is provided with a drive assembly for driving the material taking roller (22) to rotate on one side. Each material taking slot is provided with an adjustment mechanism for adjusting the material taking capacity of the material taking slot.

2. The powder collection device for laser powder bed melting in 3D printing according to claim 1, characterized in that, The crushing mechanism includes scraper rods (16), two scraper rods (16) are symmetrically arranged on the sleeve shaft (19), the scraper rods (16) are closely attached to the outside of the filter screen (14), the sleeve shaft (19) is coaxially arranged with the mounting shaft (15), the sleeve shaft (19) is rotatably arranged in the mounting hole at the upper end of the box cover (13), the mounting shaft (15) is fixedly provided with a first bevel gear (17), one end of the sleeve shaft (19) is fixedly provided with a second bevel gear (20), the first bevel gear (17) and the second bevel gear (20) are both meshed with a third bevel gear, the third bevel gear is fixedly arranged on the output end of the first motor (21), the first motor (21) is fixedly arranged on the upper end of the box cover (13), the upper end of the box cover (13) is provided with a feeding hole, and a sealing plug is fitted in the feeding hole.

3. The powder collection device for laser powder bed melting in 3D printing according to claim 2, characterized in that, An inclined plate (18) is fixedly provided on one side of the scraper (16), and the inclined plate (18) is inclined.

4. The powder collection device for laser powder bed melting in 3D printing according to claim 1, characterized in that, The drive assembly includes a worm gear (27). A worm gear (27) is fixedly mounted on the rotating shaft at one end of the material take-up roller (22). A worm (28) is meshed on each of the worm gears (27). A rotating plate is rotatably mounted on the rotating shaft at both ends of the worm (28). The rotating plate is fixedly mounted on one side of the discharge pipe (12). The rotating shaft at one end of the worm (28) is fixedly connected to the output end of the second motor (29). The second motor (29) is fixedly mounted on the upper end of a rotating plate. A sealing frame is fixedly mounted inside the discharge pipe (12). The sealing frame is tightly attached to the material take-up roller (22).

5. The powder collection device for laser powder bed melting in 3D printing according to claim 1, characterized in that, The adjustment mechanism includes an adjustment plate (23). The adjustment plate (23) is slidably provided in the feeding trough. The bottom end of the adjustment plate (23) is hinged with a connecting rod (24). The other end of the connecting rod (24) is hinged to the mounting slide rod (25). The mounting slide rod (25) is slidably provided in the sliding hole on one side of the feeding roller (22). The two mounting slide rods (25) are respectively rotatably provided at both ends of the linkage frame. The linkage frame is fixedly provided on the output end of the electric push rod (26). The electric push rod (26) is fixedly provided on one side of the discharge pipe (12).

6. The powder collection device for laser powder bed melting in 3D printing according to claim 5, characterized in that, The mounting slide (25) has several scale lines.

7. The powder collection device for laser powder bed melting in 3D printing according to claim 1, characterized in that, Several stirring rods are fixedly provided at one end of the mounting shaft (15).

8. The powder collection device for laser powder bed melting in 3D printing according to claim 1, characterized in that, The powder box (11) is symmetrically provided with mounting tubes (32), and each mounting tube (32) is slidably provided with a stop frame (30). The stop frame (30) is Z-shaped. A tension spring (31) is fixed between one side of the stop frame (30) and one side inside the mounting tube (32). A pull rod is symmetrically provided at one end of the stop frame (30). The box cover (13) is provided with a limit at the corresponding position of the other end of the stop frame (30).

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