A rotary powder spreading device for laser selective melting

Abstract

The present invention belongs to the technical field of rapid prototyping equipment and its parts, and in particular, is a laser selective melting rotary powder spreading device, comprising a base plate, the top of the base plate is fixedly connected to a printing platform, a side surface of the base plate is fixedly connected to a support plate, the top of the support plate is fixedly connected to an electric push rod, and the end of the electric push rod is fixedly connected to a fixed block. The present invention connects the powder storage device through a powder feeding pipe to convey powder to the second powder spreading tray and the first powder spreading tray, and discharges the powder to the surface of the printing platform through the powder spreading outlet. After the powder is spread, the first rotating shaft is driven to rotate by starting the motor, and then the driven gear is driven to rotate. The scraper is connected to the end of the first rotating shaft to scrape the spread powder flat by contact between the scraper and the printing platform, effectively improving the uniformity of the powder spreading. By setting multiple printing platforms, it is convenient for multiple stations to process and operate simultaneously, thereby improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of rapid prototyping equipment and parts thereof, in particular to a laser selective melting rotary powder spreading device. Background Art

[0002] Selective Laser Melting (SLM) is an additive manufacturing technology that uses metal powder as raw material. As additive manufacturing technology has received more and more attention, the research and application of SLM technology has become more and more extensive. The basic principle of SLM technology is to manufacture three-dimensional parts based on layered manufacturing and layer-by-layer accumulation. Before processing, the model must be processed first, that is, the three-dimensional model is sliced ​​and then the slice data is imported into the SLM equipment. The powder spreading device evenly spreads a layer of metal powder in the molding area. The metal powder in the molding area is scanned by laser to melt it instantly and then solidify quickly, thereby obtaining the cross-sectional shape of the molded part. Then the molding plane is lowered a certain distance, and the powder spreading and scanning processes are repeated. In this way, a three-dimensional entity is obtained by stacking layer by layer.

[0003] According to CN101588912B, a device for manufacturing three-dimensional objects layer by layer is disclosed, wherein a powder spreading system is mainly composed of a coater, a driving mechanism, and a coating element, wherein the coater is a scraper for flattening the powder material.

[0004] In these types of powder spreading devices, there are the following problems:

[0005] 1. The thickness of the powder is difficult to control during the equipment processing, which affects the material processing quality. In addition, the equipment operation in the prior art is relatively cumbersome and the work efficiency is low.

[0006] 2. When the equipment is spreading powder, dust bounces off the equipment, resulting in waste of metal powder and making it inconvenient to collect and process it. Summary of the invention

[0007] 1. Technical issues to be solved

[0008] In view of the shortcomings of the prior art, the present invention provides a laser selective melting rotary powder spreading device, which solves the problem that the thickness of the powder spread is inconvenient to control during the equipment processing, thereby affecting the material processing quality. In the prior art, the equipment operation is cumbersome and the work efficiency is low. Dust bouncing occurs when the equipment spreads powder, resulting in waste of metal powder and inconvenience in its collection and treatment.

[0009] (2) Technical solution

[0010] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a laser selective melting rotary powder spreading device, comprising a base plate, a top of the base plate is fixedly connected to a printing platform, a side surface of the base plate is fixedly connected to a support plate, a top of the support plate is fixedly connected to an electric push rod, an end of the electric push rod is fixedly connected to a fixed block, one side of the fixed block is fixedly connected to a support cover, a top of the support cover is fixedly connected to an L-shaped fixed plate, a surface of the L-shaped fixed plate is fixedly connected to a motor, a bottom of the motor is fixedly connected to a first rotating shaft, a surface of the first rotating shaft is rotatably connected to a first powder spreading plate via a bearing, a surface of the first rotating shaft is fixedly connected to a driving gear, a surface of the driving gear is connected to a driven gear via a chain drive, and a shaft center of the driven gear is fixedly connected to a first rotating shaft. A second rotating shaft is fixedly connected thereto, the surface of the second rotating shaft is rotatably connected to the support cover through a bearing, the end of the second rotating shaft passes through the support cover and is fixedly connected to a second powder spreading plate, the surfaces of the first powder spreading plate and the second rotating shaft are both provided with powder spreading outlets on their bottom surfaces, a suction fan is fixedly connected to the bottom of the base plate, a suction pipe is fixedly connected to one side of the suction fan, a powder suction cover is fixedly connected to the end of the suction pipe, the bottom of the powder suction cover is fixedly connected to the base plate, one side of the suction fan is fixedly connected to a storage box through a pipeline, the top of the storage box is fixedly connected to the base plate, the surface of the storage box is rotatably connected to a box door through a hinge, one side surface of the base plate is fixedly connected to a limiting plate, one side surface of the limiting plate is fixedly connected to a robotic arm, and the end of the robotic arm is fixedly connected to a laser device.

[0011] As a preferred technical solution of the present invention, a powder delivery pipe is fixedly connected to the top surface of the first powder spreading plate and the second rotating shaft, and the end of the powder delivery pipe passes through the support cover and extends to the outside and is connected to the powder storage device.

[0012] As a preferred technical solution of the present invention, the ends of the first rotating shaft and the second rotating shaft are fixedly connected with scrapers, and the scrapers are in a Y shape.

[0013] As a preferred technical solution of the present invention, an exhaust hole is opened on the surface of the box door, and the inside of the exhaust hole is fixedly connected to a protective net.

[0014] As a preferred technical solution of the present invention, a handle is fixedly connected to the surface of the door, and the surface of the handle is provided with anti-slip grooves.

[0015] As a preferred technical solution of the present invention, the bottom of the base plate is fixedly connected to support legs, and the number of the support legs is four.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a laser selective melting rotary powder spreading device, which has the following beneficial effects:

[0018] 1. The laser selective melting rotary powder spreading device connects the powder storage device through a powder feeding pipe to convey powder to the second powder spreading plate and the first powder spreading plate, and discharges the powder to the surface of the printing platform through the powder spreading outlet. After the powder spreading is completed, the first rotating shaft is driven to rotate by starting the motor, and then the driven gear is driven to rotate. The scraper is connected to the end of the first rotating shaft to scrape the laid powder flat by contact between the scraper and the printing platform, thereby effectively improving the uniformity of powder spreading. By setting up multiple printing platforms, it is convenient for multiple stations to process and operate at the same time, thereby improving work efficiency.

[0019] 2. The laser selective melting rotary powder spreading device is connected to a suction fan at the bottom of the base plate, the suction fan is started, and the suction fan is connected to a suction pipe. The powder is adsorbed and collected by a powder suction hood at the printing platform on the top surface of the base plate to a storage box, and the powder is stored and recycled through the storage box. This structure effectively avoids powder waste, saves material costs, and keeps the workstation environment clean and comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a cross-sectional view of the support cover of the present invention;

[0022] Figure 3 It is a side view of the rotary powder spreading device of the present invention;

[0023] Figure 4 It is a bottom view of the rotary powder spreading device of the present invention.

[0024] In the figure: 1. base plate; 2. printing platform; 3. support plate; 4. electric push rod; 5. fixing block; 6. support cover; 7. L-shaped fixing plate; 8. motor; 9. first rotating shaft; 10. first powder spreading tray; 11. driving gear; 12. driven gear; 13. second rotating shaft; 14. second powder spreading tray; 15. powder spreading outlet; 16. scraper; 17. powder delivery pipe; 18. suction fan; 19. suction pipe; 20. powder suction cover; 21. storage box; 22. box door; 23. exhaust hole; 24. limit plate; 25. robot arm; 26. laser equipment. DETAILED DESCRIPTION

[0025] 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.

[0026] Example

[0027] See also Figure 1-4 The present invention provides the following technical solutions: a laser selective melting rotary powder spreading device, comprising a bottom plate 1, a printing platform 2 is fixedly connected to the top of the bottom plate 1, a support plate 3 is fixedly connected to the surface of one side of the bottom plate 1, an electric push rod 4 is fixedly connected to the top of the support plate 3, a fixed block 5 is fixedly connected to the end of the electric push rod 4, a support cover 6 is fixedly connected to one side of the fixed block 5, an L-shaped fixed plate 7 is fixedly connected to the top of the support cover 6, a motor 8 is fixedly connected to the surface of the L-shaped fixed plate 7, a first rotating shaft 9 is fixedly connected to the bottom of the motor 8, a first powder spreading plate 10 is rotatably connected to the surface of the first rotating shaft 9 through a bearing, a driving gear 11 is fixedly connected to the surface of the driving gear 11 through a chain transmission, a second rotating shaft 13 is fixedly connected to the axis of the driven gear 12, and a second rotating shaft 13 is fixedly connected to the axis of the second rotating shaft 13. The surface of the rotating shaft 13 is rotatably connected to the support cover 6 through a bearing, and the end of the second rotating shaft 13 passes through the support cover 6 and is fixedly connected to the second powder spreading plate 14. The first powder spreading plate 10 and the bottom surfaces of the second rotating shaft 13 are provided with powder spreading outlets 15, and the bottom of the bottom of the bottom plate 1 is fixedly connected to a suction fan 18, and one side of the suction fan 18 is fixedly connected to a suction pipe 19, and the end of the suction pipe 19 is fixedly connected to a powder suction cover 20, and the bottom of the powder suction cover 20 is fixedly connected to the bottom plate 1, and one side of the suction fan 18 is fixedly connected to a storage box 21 through a pipeline, and the top of the storage box 21 is fixedly connected to the bottom plate 1, and the surface of the storage box 21 is rotatably connected to a box door 22 through a hinge, and one side surface of the bottom plate 1 is fixedly connected to a limit plate 24, and one side surface of the limit plate 24 is fixedly connected to a mechanical arm 25, and the end of the mechanical arm 25 is fixedly connected to a laser device 26.

[0028] In this embodiment, the powder storage device is connected through the powder delivery pipe 17 to convey the powder to the second powder spreading plate 14 and the first powder spreading plate 10, and the powder is discharged to the surface of the printing platform 2 through the powder spreading outlet 15. After the powder is spread, the first rotating shaft 9 is driven to rotate by starting the motor 8, and then the driven gear 12 is driven to rotate. The scraper 16 is connected to the end of the first rotating shaft 9, and the contact between the scraper 16 and the printing platform 2 is used to scrape the spread powder flat, thereby effectively improving the uniformity of the powder spread. By setting up multiple printing platforms 2, it is convenient for multiple stations to process and operate simultaneously, thereby improving work efficiency. By setting up the bottom of the base plate 1 to connect the suction fan 18, by starting the suction fan 18, the suction pipe 19 is connected through the suction fan 18, and the powder that bounces up from the printing platform 2 on the top surface of the base plate 1 is adsorbed and collected into the storage box 21 by the powder suction cover 20, and stored and recycled through the storage box 21. Through this structure, powder waste is effectively avoided, material costs are saved, and the work station environment is kept clean and comfortable.

[0029] Specifically, a powder delivery pipe 17 is fixedly connected to the top surface of the first powder spreading plate 10 and the second rotating shaft 13 , and an end of the powder delivery pipe 17 passes through the support cover 6 and extends to the outside to be connected to the powder storage device.

[0030] In this embodiment, by providing a plurality of powder delivery pipes 17, it is convenient to connect the powder delivery pipes 17 and the powder storage device to transport the conveyed powder to the inside of the first powder spreading plate 10 and the second rotating shaft 13, thereby facilitating multi-station powder spreading operations.

[0031] Specifically, the ends of the first rotating shaft 9 and the second rotating shaft 13 are both fixedly connected with a scraper 16 , and the scraper 16 is in a Y shape.

[0032] In this embodiment, the scraper 16 is provided to facilitate the scraper 16 to level the unevenly spread powder on the surface of the printing platform 2, thereby improving the uniformity of powder spreading and further improving product quality.

[0033] Specifically, an exhaust hole 23 is opened on the surface of the box door 22, and the inside of the exhaust hole 23 is fixedly connected to the protective net.

[0034] In this embodiment, the exhaust hole 23 is provided to facilitate exhaust, and the protective net is provided to prevent the collected powder from escaping.

[0035] Specifically, a handle is fixedly connected to the surface of the box door 22, and the surface of the handle is provided with anti-slip grooves.

[0036] In this embodiment, a handle is provided on the surface of the box door 22 to facilitate opening the storage box 21 and to make it more convenient to replace and recycle the powder collected inside.

[0037] Specifically, the bottom of the base plate 1 is fixedly connected to supporting legs, and the number of the supporting legs is four.

[0038] In this embodiment, the support legs are provided to facilitate the support and fixation of the base plate 1, thereby improving the stability of the device.

[0039] The working principle and use process of the present invention are as follows: when it is needed, the powder is transported to the second powder spreading plate 14 and the first powder spreading plate 10 by connecting the powder feeding pipe 17 to the powder storage device, and the powder is discharged to the surface of the printing platform 2 through the powder spreading outlet 15. After the powder spreading is completed, the first rotating shaft 9 is driven to rotate by starting the motor 8, and then the driven gear 12 is driven to rotate. The scraper 16 is connected to the end of the first rotating shaft 9, and the contact between the scraper 16 and the printing platform 2 is used to scrape the laid powder flat, thereby effectively improving the uniformity of the powder spreading. By setting up multiple printing platforms 2, it is convenient for multiple stations to process and operate at the same time, thereby improving work efficiency. By setting up the bottom of the bottom plate 1, the suction fan 18 is connected, and the suction fan 18 is started, and the suction pipe 19 is connected through the suction fan 18, and the powder suction cover 20 is used to absorb and collect the powder bounced up from the printing platform 2 on the top surface of the bottom plate 1 to the storage box 21, and the storage box 21 is used for storage and recovery. The computer-controlled laser device 26 is connected to the robot arm 25 and moved to the top of the printing platform 2, and the laid metal powder is laser melted and formed, which is convenient for the next step of processing.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laser selective melting rotary powder spreading device, comprising a bottom plate (1), Features: The top of the base plate (1) is fixedly connected to a printing platform (2); a side surface of the base plate (1) is fixedly connected to a support plate (3); the top of the support plate (3) is fixedly connected to an electric push rod (4); the end of the electric push rod (4) is fixedly connected to a fixed block (5); one side of the fixed block (5) is fixedly connected to a support cover (6); the top of the support cover (6) is fixedly connected to an L-shaped fixed plate (7); the surface of the L-shaped fixed plate (7) is fixedly connected to a motor (8); the bottom of the motor (8) is fixedly connected to a a rotating shaft (9), the surface of the first rotating shaft (9) is rotatably connected to a first powder spreading plate (10) via a bearing, the surface of the first rotating shaft (9) is fixedly connected to a driving gear (11), the surface of the driving gear (11) is connected to a driven gear (12) via a chain transmission, the axis of the driven gear (12) is fixedly connected to a second rotating shaft (13), the surface of the second rotating shaft (13) is rotatably connected to a support cover (6) via a bearing, the end of the second rotating shaft (13) passes through the support cover (6) and is fixedly connected to a second rotating shaft (13). Two powder spreading trays (14), the first powder spreading tray (10) and the second rotating shaft (13) are provided with powder spreading outlets (15) on their bottom surfaces, the bottom of the bottom plate (1) is fixedly connected with a suction fan (18), one side of the suction fan (18) is fixedly connected with a suction pipe (19), the end of the suction pipe (19) is fixedly connected with a powder suction cover (20), the bottom of the powder suction cover (20) is fixedly connected with the bottom plate (1), one side of the suction fan (18) is fixedly connected with a storage box (21) through a pipeline, the top of the storage box (21) is fixedly connected with the bottom plate (1), the surface of the storage box (21) is rotatably connected with a box door (22) through a hinge, one side surface of the bottom plate (1) is fixedly connected with a limit plate (24), one side surface of the limit plate (24) is fixedly connected with a mechanical arm (25), and the end of the mechanical arm (25) is fixedly connected with a laser device (26); A powder delivery pipe (17) is fixedly connected to the top surface of the first powder spreading plate (10) and the second rotating shaft (13), and an end of the powder delivery pipe (17) passes through the support cover (6) and extends to the outside and is connected to the powder storage device; The ends of the first rotating shaft (9) and the second rotating shaft (13) are both fixedly connected with a scraper (16), and the scraper (16) is in a Y shape.

2. A rotary powder spreading device for laser selective melting according to claim 1, Features: An exhaust hole (23) is provided on the surface of the box door (22), and the interior of the exhaust hole (23) is fixedly connected to a protective net.

3. A laser selective melting rotary powder spreading device according to claim 1, Features: A handle is fixedly connected to the surface of the box door (22), and the surface of the handle is provided with anti-slip grooves.

4. A laser selective melting rotary powder spreading device according to claim 1, Features: The bottom of the base plate (1) is fixedly connected to support legs, and the number of the support legs is four.

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