A laser additive powder spreading device

Abstract

The utility model relates to a kind of laser additive powder laying device, including frame, the frame is provided with the forming cylinder for powder laying and the powder supply cylinder for storing powder, the upper portion of the frame is provided with transverse moving mechanism, the bottom of transverse moving mechanism is connected with powder laying component, a group of interlaced lifting scraper assembly is provided in powder laying component, the frame outside the powder supply cylinder is provided with the return cylinder for recycling excess powder, the cooperation of transverse moving mechanism, powder laying component and scraper component, can complete twice scraping powder operation back and forth, both can make up the problem of uneven scraping powder or local existence scraping powder unreal in single scraping powder, simultaneously in the process of back and forth scraping powder, excess powder can be brought out by scraper, avoid excess powder to remain in table top, affect processing precision, the device is applicable to industrial production, with very strong practicability.

Description

Technical Field

[0001] This utility model belongs to the technical field of laser additive manufacturing equipment, and particularly relates to a laser additive powder spreading device. Background Technology

[0002] A patent titled "A Laser Additive Manufacturing Equipment" is published in the existing Chinese patent database. The application number is CN202320898491.0, and the application date is April 20, 2023. This laser additive manufacturing equipment includes a base, a support frame fixedly connected to the base, two sets of guide rails arranged parallel to each other on opposite sides of the top of the support frame, and a crossbeam slidably connected between the two sets of guide rails. A longitudinal drive assembly is provided between the crossbeam and the guide rails. A movable slide is slidably mounted on the crossbeam, and a transverse drive assembly is provided between the movable slide and the crossbeam. A support rod is vertically fixedly connected to the bottom of the movable slide, and a height adjustment part is provided on the support rod. A swing arm is provided at the bottom of the height adjustment part, and a laser processing system is mounted on the swing arm. A rotary clamping part is provided at the top of the base, and the laser processing system is correspondingly arranged with the rotary clamping part. This invention allows for free adjustment of the laser head's processing angle and facilitates relative rotation between the laser head and the workpiece.

[0003] In existing technologies, laser additive manufacturing typically involves a single powder scraping operation. This method results in uneven and non-uniform powder distribution, and excess powder remains on the worktable surface that cannot be removed. Therefore, this paper aims to propose a laser additive powder spreading device that can perform a second powder scraping operation and remove excess powder during the scraping process. Utility Model Content

[0004] The technical problem to be solved by this invention is how to improve the uniformity of powder spreading in laser additive manufacturing technology and recover excess powder. In order to improve its shortcomings, this invention provides a laser additive powder spreading device.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A laser additive powder spreading device includes a frame, a forming cylinder for powder spreading and a powder supply cylinder for storing powder are arranged inside the frame, a lateral moving mechanism is arranged on the upper part of the frame, a powder spreading component is connected to the bottom of the lateral moving mechanism, a set of alternately lifting scraper assemblies are arranged inside the powder spreading component, and a return cylinder for recovering excess powder is arranged inside the frame located outside the powder supply cylinder.

[0007] Compared with the prior art, the beneficial effects of this utility model are: due to the coordinated arrangement of the lateral moving mechanism, the powder spreading component, and the scraper component, two powder scraping operations can be completed back and forth. This can not only make up for the problem of uneven powder scraping or localized incomplete powder scraping that may occur in a single powder scraping operation, but also carry away excess powder through the scraper during the back and forth powder scraping process, avoiding excess powder residue on the table surface and affecting processing accuracy. This device is suitable for industrial production and has strong practicality.

[0008] As a preferred embodiment, the lateral movement mechanism includes a horizontally arranged lead screw, one end of which is hinged to the frame and the other end is connected to a reducer. The reducer is fixedly installed on the frame, and a lead screw nut seat is connected to the lead screw. The lead screw, lead screw nut seat, and reducer cooperate to form a lead screw transmission mechanism.

[0009] As a preferred embodiment, a connecting plate is fixedly connected to the bottom of the lead screw nut seat. The powder spreading component includes a box body fixedly connected to the lower surface of the connecting plate. Two sets of vertical slide rail assemblies are provided inside the box body. The two sets of slide rail assemblies are respectively arranged in the longitudinal front and rear of the box body. Each set of slide rail assemblies includes two slide rail bodies. Each slide rail body is fixedly arranged on both sides of the transverse inner wall of the box body. A rack is slidably connected to each slide rail body. The scraper assembly is fixedly connected to the bottom of the rack. A central shaft is rotatably connected inside the box body. A gear is connected to the central shaft inside the box body. The two sides of the gear are respectively meshed with the two racks. The gear rotates synchronously with the central shaft.

[0010] As a preferred embodiment, the scraper assembly includes a blade holder body fixedly connected to the bottom of the rack, the blade holder body having a mounting surface extending downwards, and a scraper body fixedly connected between the two blade holder mounting surfaces located longitudinally in the housing, with the sharp ends of the two scraper bodies located on both sides of the gear facing each other.

[0011] As a preferred embodiment, a guide block is integrally provided on the upper surface of the connecting plate, and a horizontal guide rod is provided inside the frame, with the guide block slidably connected to the guide rod. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0014] In the diagram: 1. Frame, 2. Forming cylinder, 3. Powder supply cylinder, 4. Lateral movement mechanism, 5. Powder spreading component, 6. Scraper assembly, 7. Return cylinder, 8. Lead screw, 9. Reducer, 10. Lead screw nut seat, 11. Connecting plate, 12. Housing, 13. Slide rail, 14. Rack, 15. Central shaft, 16. Gear, 17. Scraper holder, 18. Mounting surface, 19. Scraper body, 20. Guide block, 21. Guide rod. Detailed Implementation

[0015] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1-2 As shown, a laser additive powder spreading device includes a frame 1. The frame 1 is equipped with a forming cylinder 2 for spreading powder and a powder supply cylinder 3 for storing powder. The forming cylinder 2 and the powder supply cylinder 3 are conventional configurations and will not be described in detail here. A transverse moving mechanism 4 is provided on the upper part of the frame 1. The bottom of the transverse moving mechanism 4 is connected to a powder spreading component 5. A set of alternately lifting scraper assemblies 6 is provided in the powder spreading component 5. A return cylinder 7 for recycling excess powder is provided in the frame 1 located outside the powder supply cylinder 3.

[0017] Specifically, the lateral movement mechanism 4 includes a horizontally positioned lead screw 8. One end of the lead screw 8 is hinged to the frame 1, and the other end is connected to a reducer 9. The reducer 9 is fixedly mounted on the frame 1. A lead screw nut seat 10 is connected to the lead screw 8. The lead screw 8, the lead screw nut seat 10, and the reducer 9 cooperate to form a lead screw transmission mechanism. To ensure that it does not interfere with the laser working area, the position of the lead screw transmission mechanism can be adjusted longitudinally to be offset from the working area.

[0018] Specifically, a connecting plate 11 is fixedly connected to the bottom of the lead screw nut seat 10. The powder spreading component 5 includes a housing 12 fixedly connected to the lower surface of the connecting plate 11. Two sets of vertical slide rail assemblies are installed inside the housing 12, with the two sets of slide rail assemblies respectively positioned longitudinally at the front and rear of the housing 12. Each set of slide rail assemblies includes two slide rail bodies 13, each slide rail body 13 fixedly mounted on both sides of the transverse inner wall of the housing 12. A rack 14 is slidably connected to each slide rail body 13, and a scraper assembly 6 is fixedly connected to the bottom of the rack 14. A central shaft 15 is rotatably connected inside the housing 12, and a gear 16 is connected to the central shaft 15 located inside the housing 12. The gear 16 meshes with the two racks 14 on both sides, and rotates synchronously with the central shaft 15. The rotation control of the central shaft 15 is achieved by a micro servo motor installed outside the housing 12, with the output end of the micro servo motor axially connected to the central shaft 15.

[0019] Specifically, the scraper assembly 6 includes a blade holder body 17 fixedly connected to the bottom of the rack 14. The blade holder body 17 extends downward to have a mounting surface 18. A scraper body 19 is fixedly connected between the mounting surfaces 18 of the two blade holder bodies 17 located longitudinally in the housing 12. The sharp points of the two scraper bodies 19 located on both sides of the gear 16 are arranged facing each other.

[0020] Specifically, a guide block 20 is integrally provided on the upper surface of the connecting plate 11, and a horizontal guide rod 21 is provided inside the frame 1. The guide block 20 is slidably connected to the guide rod 21. The arrangement of the guide block 20 and the guide rod 21 improves the stability of the transverse moving mechanism 4 during horizontal movement, and at the same time avoids the screw nut seat 10 from being subjected to excessive shear force due to the weight of the powder spreading component 5. The guide rod 21 and the guide block 20 provide auxiliary force support.

[0021] When this utility model is in operation, the powder supply cylinder 3 pushes a certain amount of powder upward to the starting horizontal line of powder spreading. The reducer 9 drives the lead screw 8 to rotate, and the rotation of the lead screw 8 drives the lead screw nut seat 10 to move laterally to the leftmost end. Then, the control gear 16 rotates clockwise. Through the action of the gear 16 and the rack 14, the scraper assembly 6 on the right side of the housing 12 is driven to descend until the bottom of the scraper is below the starting horizontal line. After completion, the lateral movement mechanism 4 drives the scraper assembly 6 to move horizontally to the left at a uniform speed, spreading the powder on the surface of the forming cylinder 2 to form a powder layer of uniform thickness. When the scraper assembly 6 moves to the leftmost side, the first powder scraping operation is completed. At this time, the powder layer density may be uneven or locally loose. The control gear 16 rotates counterclockwise, so that the scraper assembly 6 on the right side rises and the scraper assembly 6 on the left side descends. After completion, the lateral movement mechanism 4 drives the scraper assembly 6 to move horizontally to the right at a uniform speed to the rightmost end, that is, to perform the second powder scraping, further increasing the density of the powder layer, and at the same time scraping off the excess powder into the return cylinder 7.

[0022] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A laser additive powder spreading device, comprising a frame (1), wherein a forming cylinder (2) for powder spreading and a powder supply cylinder (3) for storing powder are disposed within the frame (1), characterized in that: The frame (1) is provided with a transverse moving mechanism (4) at the top. The bottom of the transverse moving mechanism (4) is connected to a powder spreading component (5). A set of alternating lifting scraper assemblies (6) is provided inside the powder spreading component (5). A return cylinder (7) for recycling excess powder is provided inside the frame (1) located outside the powder supply cylinder (3).

2. The laser additive powder spreading device according to claim 1, characterized in that: The lateral movement mechanism (4) includes a horizontally arranged lead screw (8), one end of which is hinged to the frame (1) and the other end is connected to a reducer (9). The reducer (9) is fixedly installed on the frame (1). A lead screw nut seat (10) is connected to the lead screw (8). The lead screw (8), the lead screw nut seat (10) and the reducer (9) cooperate to form a lead screw transmission mechanism.

3. The laser additive powder spreading device according to claim 2, characterized in that: The bottom of the lead screw nut seat (10) is fixedly connected to a connecting plate (11). The powder spreading component (5) includes a box (12) fixedly connected to the lower surface of the connecting plate (11). Two sets of vertical slide rail assemblies are provided inside the box (12). The two sets of slide rail assemblies are respectively set in the longitudinal front and rear of the box (12). Each set of slide rail assemblies includes two slide rail bodies (13). Each slide rail body (13) is fixedly set on both sides of the transverse inner wall of the box (12). Each slide rail body (13) is slidably connected to a rack (14). The bottom of the rack (14) is fixedly connected to the scraper assembly (6). A central shaft (15) is rotatably connected inside the box (12). A gear (16) is connected to the central shaft (15) located inside the box (12). The two sides of the gear (16) are respectively meshed with the two racks (14). The gear (16) rotates synchronously with the central shaft (15).

4. The laser additive powder spreading device according to claim 3, characterized in that: The scraper assembly (6) includes a blade holder body (17) fixedly connected to the bottom of the rack (14). The blade holder body (17) extends downward to have a mounting surface (18). A scraper body (19) is fixedly connected between the mounting surfaces (18) of the two blade holder bodies (17) located longitudinally in the housing (12). The sharp points of the two scraper bodies (19) located on both sides of the gear (16) are arranged facing each other.

5. A laser additive powder spreading device according to claim 3 or 4, characterized in that: A guide block (20) is integrally provided on the upper surface of the connecting plate (11), and a horizontal guide rod (21) is provided inside the frame (1). The guide block (20) is slidably connected to the guide rod (21).

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