Multi-material powder bed laying device

Abstract

The utility model discloses a multi-material powder bed laying device, which relates to the technical field of laser melting multi-material forming, and comprises a powder falling mechanism used for moving along the Y-axis direction in the horizontal direction, and the powder falling mechanism comprises a powder filling bin, a partition plate, a stirring bin, a stirring piece and a powder falling port control assembly, the partition plates are arranged in the powder filling bin to divide the powder filling bin into a plurality of material distribution chambers in the Y-axis direction, the stirring piece is arranged in the stirring bin and can mix powder of different components entering the stirring bin in the Y-axis direction, and a powder falling opening communicating with the stirring bin is formed in the powder falling opening control assembly. The powder falling opening control assembly controls the upward size of the powder falling opening in the X-axis direction and controls the powder falling opening to move in the X-axis direction, the X-axis direction is perpendicular to the Y-axis direction in the horizontal direction, the structure is simple, use is convenient, and single-component, continuous-gradient and fixed-point area specific-component laying of the multi-material powder bed can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of laser melting multi-material forming technology, and in particular to a device for multi-material powder bed laying. Background Technology

[0002] In today's context of continuous technological advancements, the working conditions faced by components in practical applications are becoming increasingly diverse, with different locations of the same component often operating in drastically different environments. However, traditional materials have relatively limited overall properties, and under such harsh operating conditions, components are highly susceptible to interface damage due to a mismatch between their physical properties and the working conditions.

[0003] To address this challenge, "gradient material components" have emerged. The performance of these components varies with different compositions and structures, effectively reducing and overcoming performance mismatches at the bonding sites, and have attracted widespread attention from researchers.

[0004] Selective laser melting technology in additive manufacturing has become a focal point in the field of advanced intelligent manufacturing technology due to its many advantages such as high quality, superior performance, high precision, and free shaping. It has successfully provided a large number of mature solutions in many important fields such as aerospace, industrial machinery, automobiles, and medical.

[0005] Currently, selective laser melting (SLM) technology offers a novel approach for fabricating gradient material components. It employs a powder bed placement mechanism, with two common powder supply methods: top-feed and bottom-feed. Top-feed involves the powder supply chamber being located at the top, relying on gravity to allow the powder to fall and then be spread into a powder bed using a scraper, as in the top-feed device proposed in invention patent 202110442679X. While this allows for gradient powder placement of two or more components between layers, the consistent opening and closing dimensions of the π-shaped plate along the X-axis result in a fixed horizontal proportion of each component in the powder layer, making it impossible to place specific components in specific areas. Bottom-feed involves the powder supply chamber being located at the bottom, with a lead screw at the bottom plate lifting the powder above the forming platform, where it is then spread into a powder bed by a scraper. The X, Y, and Z axes are commonly used coordinate systems, with the X and Y axes being horizontally perpendicular and the Z axis perpendicular to the horizontal plane.

[0006] Existing technologies have significant limitations in meeting the needs of practical engineering for gradient components or multi-material components. There is an urgent need for a device that can achieve single-component, continuous gradient, and fixed-point region specific component placement in multi-material powder beds. Utility Model Content

[0007] The purpose of this invention is to provide a device for laying multi-material powder beds to solve the problems existing in the prior art. It has a simple structure, is easy to use, and can realize the laying of single components, continuous gradients, and specific components in fixed-point areas of multi-material powder beds.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] This utility model provides a multi-material powder bed laying device, comprising: a powder dropping mechanism, which is used to move along the Y-axis in the horizontal direction; the powder dropping mechanism includes a powder filling chamber, a separating belt, a stirring chamber, a stirring element, and a powder dropping port control component; the separating belt is disposed in the powder filling chamber to divide the powder filling chamber into multiple dispensing chambers in the Y-axis direction, and the multiple dispensing chambers are used to fill powders of different components respectively; the stirring chamber is disposed below the powder filling chamber and communicates with the powder filling chamber; the stirring element is disposed in the stirring chamber and can mix powders of different components entering the stirring chamber in the Y-axis direction; the powder dropping port control component is disposed at the bottom of the stirring chamber and forms a powder dropping port communicating with the stirring chamber; the powder dropping port control component can control the upward size of the powder dropping port in the X-axis direction and control the movement of the powder dropping port in the X-axis direction, the X-axis direction being perpendicular to the Y-axis direction in the horizontal direction.

[0010] Preferably, the powder dispensing mechanism further includes a first slider and a second slider. The powder filling chamber has a rectangular frame structure and has a first sidewall and a second sidewall arranged opposite to each other in the X-axis direction. The first slider is slidably connected to the first sidewall in the Y-axis direction and can maintain its slidable position. The second slider is slidably connected to the second sidewall in the Y-axis direction and can maintain its slidable position. The separating strip is made of a material with elastic properties. One end of the separating strip is fixedly connected to the first slider and the other end is fixedly connected to the second slider.

[0011] Preferably, the separator is made of hard rubber material.

[0012] Preferably, the first sliding member includes a first fixed block, a first slider, a first lead screw, and a first motor. A first slide rail is provided at the bottom of the first sidewall along the Y-axis direction. The first slider is slidably connected in the first slide rail. The top of the first slider is fixedly connected to the first fixed block. The first fixed block is used to fixally connect to one end of the separator. A first threaded hole is provided in the middle of the first slider along the Y-axis direction. The first motor is fixedly connected to the outside of the powder filling bin. One end of the first lead screw is fixedly connected to the output shaft of the first motor, and the other end is rotatably connected to the first slide rail. The first lead screw is threaded through the first threaded hole and threadedly connected to the first threaded hole to drive the first slider to move in the first slide rail.

[0013] Preferably, the second slider includes a second fixed block, a second slider, a second lead screw, and a second motor. A second slide rail is provided at the bottom of the second sidewall along the Y-axis direction. The second slider is slidably connected within the second slide rail. The top of the second slider is fixedly connected to the second fixed block. The second fixed block is used to fix one end of the separator. A second threaded hole is provided in the middle of the second slider along the Y-axis direction. The second motor is fixedly connected to the outside of the powder filling bin. One end of the second lead screw is fixedly connected to the output shaft of the second motor, and the other end is rotatably connected to the second slide rail. The second lead screw passes through the second threaded hole and is threadedly connected to the second threaded hole to drive the second slider to move within the second slide rail.

[0014] Preferably, the mixing component includes a plurality of mixing rollers, each of which is disposed within the mixing chamber. Each mixing roller is capable of self-rotating along its own axis, and the axis of the mixing roller is arranged parallel to the X-axis direction.

[0015] Preferably, all the mixing rollers are located on the same horizontal plane, the distance between adjacent mixing rollers is h, and the distance satisfies 3mm < h ≤ 5mm, and the surface roughness of the mixing rollers is Ra, and the distance satisfies 6.3μm < Ra ≤ 12.5μm.

[0016] Preferably, the powder discharge port control assembly includes a first partition plate, a first toothed plate, a third motor, a first gear, a second partition plate, a second toothed plate, a fourth motor, and a second gear. The bottom of the mixing chamber has a third slide rail and a fourth slide rail arranged along the X-axis on both sides. The first partition plate and the second partition plate are slidably connected to the third slide rail and the fourth slide rail respectively on both sides. The first partition plate and the second partition plate are spaced apart in the X-axis direction, forming the powder discharge port between them. The first toothed plate is fixedly connected to the top of the first partition plate. The third motor is fixedly connected to the outer wall of the mixing chamber. The first gear is fixedly connected to the output shaft of the third motor. The first gear meshes with the first toothed plate to drive the first toothed plate to move in the X-axis direction. The second toothed plate is fixedly connected to the top of the second partition plate. The fourth motor is fixedly connected to the outer wall of the mixing chamber on the side away from the third motor. The second gear is fixedly connected to the output shaft of the fourth motor. The second gear meshes with the second toothed plate to drive the second toothed plate to move in the X-axis direction.

[0017] Preferably, the powder dispensing mechanism further includes a vibrating element, which is fixed to the outside of one of the side walls of the mixing chamber that are correspondingly arranged along the Y-axis direction to vibrate the powder in the mixing chamber in the Y-axis direction.

[0018] Preferably, it further includes a flexible scraper mechanism, which includes a wiping cotton, a scraper support, a scraper, a scraper central shaft, a scraper slide, and a dust collection assembly. The scraper support is movable along the Y-axis, the scraper central shaft is rotatably connected to the scraper support, and the scraper central shaft is parallel to the X-axis. The scraper is fixedly sleeved on the outside of the scraper central shaft. The wiping cotton has the same length as the scraper in the X-axis direction, and the wiping cotton contacts the scraper and partially wraps around the top of the scraper. The dust collection assembly is connected to the scraper support to clean the powder bed that may not form.

[0019] The present invention achieves the following technical advantages over the prior art:

[0020] This invention provides a device for multi-material powder bed laying. By setting a powder dropping mechanism, multi-material powders can be stored in different distribution chambers. After mixing in the Y-axis direction by a stirring component, the size and position of the powder dropping port in the X-axis direction can be precisely controlled by the powder dropping port control component according to the needs. This meets the requirements of laying powders of different proportions and different components in different areas, thereby realizing diversified laying of multi-material powders in the X-Y axis plane. This provides a basis for preparing components with complex gradient structures or material distribution in specific areas, and improves the flexibility and accuracy of multi-material powder bed laying. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of the multi-material powder bed laying device provided by this utility model;

[0023] Figure 2 A top view of the multi-material powder bed laying device provided by this utility model when the first fixing block is at the end and the second fixing block is in the middle;

[0024] Figure 3 A top view of the multi-material powder bed laying device provided by this utility model, in which the first fixing block is at the end and the second fixing block is at the end, so that the separating strip is located at the diagonal position;

[0025] Figure 4 A schematic diagram of the powder droplet control component in the multi-material powder bed laying device provided by this utility model;

[0026] Figure 5 A schematic diagram of the flexible scraper mechanism in the multi-material powder bed laying device provided by this utility model;

[0027] Figure 6 A schematic diagram of the dust collection component in the multi-material powder bed laying device provided by this utility model;

[0028] Figure 7 A schematic diagram of the structure of the multi-material powder bed laying device provided by this utility model, in which the first and second partition plates are fully opened to achieve powder laying in the entire forming area;

[0029] Figure 8 A schematic diagram of the structure of the multi-material powder bed laying device provided by this utility model, in which the first and second partition plates are opened as needed to achieve powder laying in a part of the forming area;

[0030] Figure 9 A schematic diagram of the structure of the multi-material powder bed laying device provided by this utility model, in which the first and second partition plates change as needed during the movement to achieve powder laying in the irregular area of ​​the forming zone;

[0031] In the diagram: 100. Powder discharging mechanism; 1. Powder filling bin; 11. Separator belt; 12. First fixed block; 13. First slider; 14. First lead screw; 15. First motor; 16. First slide rail; 17. Second fixed block; 2. Mixing bin; 21. Mixing roller; 22. Third slide rail; 23. Fourth slide rail; 3. Powder discharging port control assembly; 31. First separator plate; 32. Third motor; 33. Second separator plate; 34. Fourth motor; 4. Vibrating component; 5. Flexible scraper mechanism; 51. Wiping cotton; 52. Scraper bracket; 53. Scraper; 54. Scraper central shaft; 55. Dust collection assembly; 551. Main air duct; 552. Primary air duct; 553. Secondary air duct; 554. Tertiary air duct; 555. Quaternary air duct. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The purpose of this invention is to provide a device for laying multi-material powder beds to solve the problems existing in the prior art. It has a simple structure, is easy to use, and can realize the laying of single components, continuous gradients, and specific components in fixed-point areas of multi-material powder beds.

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] This utility model provides a device for multi-material powder bed laying, such as... Figures 1-9The diagram shows a powder feeding mechanism 100, which moves along the Y-axis in the horizontal direction. The powder feeding mechanism 100 includes a powder filling bin 1, a separating belt 11, a mixing bin 2, a mixing element, and a powder discharge port control assembly 3. The separating belt 11 is disposed within the powder filling bin 1 to divide it into multiple distribution chambers along the Y-axis. These chambers are used to fill powders of different components. The mixing bin 2 is located below and communicates with the powder filling bin 1. The mixing element is disposed within the mixing bin 2 and is capable of mixing powders of different components entering the mixing bin 2 along the Y-axis. The powder discharge port control assembly... 3 is located at the bottom of the mixing chamber 2, and the powder discharge port control component 3 forms a powder discharge port that communicates with the mixing chamber 2. The powder discharge port control component 3 can control the upward size of the powder discharge port in the X-axis direction and control the movement of the powder discharge port in the X-axis direction. The X-axis direction is perpendicular to the Y-axis direction in the horizontal direction, so that multi-material powders can be stored in different distribution chambers. After being mixed in the Y-axis direction by the agitator, the size and position of the powder discharge port in the X-axis direction can be precisely controlled by the powder discharge port control component 3 according to the requirements, so as to meet the needs of laying different proportions and different components of powders in different areas, thereby realizing the diversified laying of multi-material powders on the X-axis-Y-axis plane, providing a basis for the preparation of components with complex gradient structures or material distribution in specific areas, and improving the flexibility and accuracy of multi-material powder bed laying.

[0036] In a preferred embodiment, the powder dispensing mechanism 100 further includes a first slider and a second slider. The powder filling chamber 1 has a rectangular frame structure, with two side walls in the X-axis direction, namely the first side wall and the second side wall. The first slider is slidably connected to the first side wall and can maintain its slidable position, and the second slider is slidably connected to the second side wall and can maintain its slidable position. The separating strip 11 is made of a material with elastic properties. One end of the separating strip 11 is fixedly connected to the first slider, and the other end is fixedly connected to the second slider. The first and second sliders cooperate with the elastic separating strip 11 to easily adjust the position of the separating strip 11 within the powder filling chamber 1, thereby changing the size and shape of the multiple dispensing chambers in the Y-axis direction. This allows the storage space for different component powders to be flexibly adjusted according to actual needs, meeting various multi-material ratios and laying requirements, and further improving the flexibility and accuracy of dispensing.

[0037] In a preferred embodiment, the separator 11 is made of hard rubber material. The separator 11 made of hard rubber material has good strength and rigidity, and can maintain shape stability during expansion and contraction. It can effectively separate powders of different components, prevent powders in adjacent distribution chambers from leaking into each other, ensure the purity and independence of powders stored in each distribution chamber, ensure the accuracy and stability of powder laying, and improve the quality of the final product.

[0038] In a preferred embodiment, the first slider includes a first fixing block 12, a first slider 13, a first lead screw 14, and a first motor 15. A first slide rail 16 is provided at the bottom of the first sidewall. The first slider 13 is slidably connected to the first slide rail 16. The top of the first slider 13 is fixedly connected to the first fixing block 12. The first fixing block 12 is used to fixally connect to one end of the separator 11. A first threaded hole is provided in the middle of the first slider 13. The first motor 15 is fixedly connected to the outside of the powder filling hopper 1. One end of the first lead screw 14 is fixedly connected to the output shaft of the first motor 15, and the other end is rotatably connected to the first slide rail 16. The first lead screw 14 passes through the first threaded hole and is threadedly connected to the first threaded hole to drive the first slider 13 to move in the first slide rail 16. The position movement of the first slider 13 in the first slide rail 16 can be precisely controlled, thereby precisely adjusting the position of one end of the separator 11. This transmission method has high transmission accuracy and good stability, and can achieve precise control of the position and size of the material distribution chamber in the X-axis direction, thereby accurately allocating the storage space for powders of different components, which is beneficial to improving the accuracy and consistency of multi-material powder laying.

[0039] In a preferred embodiment, the second sliding member includes a second fixed block 17, a second slider, a second lead screw, and a second motor. A second slide rail is provided at the bottom of the second sidewall. The second slider is slidably connected within the second slide rail, and its top is fixedly connected to the second fixed block 17. The second fixed block 17 is used to fix one end of the separating strip 11. A second threaded hole is provided in the middle of the second slider. The second motor is fixedly connected to the outside of the powder filling hopper 1. One end of the second lead screw is fixedly connected to the output shaft of the second motor, and the other end is rotatably connected to the second slide rail. The second lead screw passes through the second threaded hole and is threadedly connected to it to drive the second slider to move within the second slide rail. The second sliding member, driven by the motor and the lead screw, can precisely control the position of the second slider within the second slide rail, thereby achieving precise adjustment of the position of the other end of the separating strip 11. Working in conjunction with the first sliding member, the position and state of the separating strip 11 within the powder filling hopper 1 can be adjusted more flexibly and precisely, achieving comprehensive and precise control over the shape and size of multiple material distribution chambers, further meeting the needs of complex multi-material placement, and improving the applicability and performance of the device.

[0040] In a preferred embodiment, the agitator includes multiple mixing rollers 21, each disposed within a mixing chamber 2. Each mixing roller 21 is capable of rotating along its own axis, which is parallel to the X-axis. The multiple mixing rollers 21 rotating along this axis, parallel to the X-axis, form a specific mixing zone within the mixing chamber 2, enabling thorough mixing of different component powders entering the mixing chamber 2 in the Y-axis direction. This arrangement ensures uniform mixing of the powders in the Y-axis direction, resulting in a stable component ratio of the powder falling from the powder outlet, which helps improve the powder bed laying quality and the quality stability of subsequent molded parts.

[0041] In a preferred embodiment, all mixing rollers 21 are located on the same horizontal plane, with a spacing of h between adjacent mixing rollers 21, satisfying 3mm < h ≤ 5mm. The surface roughness of the mixing rollers 21 is Ra, satisfying 6.3μm < Ra ≤ 12.5μm. The mixing rollers 21 being located on the same horizontal plane and with a specific spacing facilitates the formation of a uniform mixing zone. This ensures sufficient contact and mixing of different component powders while avoiding situations where some powders cannot be fully mixed due to excessive spacing or where interference occurs between the mixing rollers 21 due to insufficient spacing. An appropriate range of surface roughness increases the friction between the powder and the mixing rollers 21, helping to better drive the powder movement. While ensuring the mixing effect, it effectively prevents powder movement in the horizontal direction, further improving the uniformity of mixing and effectively ensuring the component gradient of the powder in the X-axis direction, thus guaranteeing a high-quality powder bed.

[0042] In a preferred embodiment, the powder discharge port control assembly 3 includes a first partition plate 31, a first toothed plate, a third motor 32, a first gear, a second partition plate 33, a second toothed plate, a fourth motor 34, and a second gear. A third slide rail 22 and a fourth slide rail 23 are provided on both sides of the bottom of the mixing chamber 2. The third slide rail 22 and the fourth slide rail 23 are horizontally arranged and parallel to the X-axis direction. The two sides of the first partition plate 31 are slidably connected to the third slide rail 22 and the fourth slide rail 23, respectively. The two sides of the second partition plate 33 are slidably connected to the third slide rail 22 and the fourth slide rail 23, respectively. The first toothed plate is fixedly connected to the first partition plate. At the top of plate 31, a third motor 32 is fixedly connected to the outer wall of the mixing chamber 2. A first gear is fixedly connected to the output shaft of the third motor 32 and meshes with a first toothed plate. A second toothed plate is fixedly connected to the top of the second partition plate 33. A fourth motor 34 is fixedly connected to the outer wall of the mixing chamber 2 on the side away from the third motor 32. A second gear is fixedly connected to the output shaft of the fourth motor 34 and meshes with a second toothed plate. The motor drives the meshing transmission between the gear and the toothed plate, which can precisely control the sliding position of the first partition plate 31 and the second partition plate 33 within the third slide rail 22 and the fourth slide rail 23. This allows for precise adjustment of the size and position of the powder inlet in the X-axis direction, meeting the precise requirements of powder distribution and placement in different areas. This greatly improves the accuracy and flexibility of multi-material powder bed placement, which is beneficial for preparing components with various complex structures and different material distribution requirements.

[0043] In a preferred embodiment, the powder feeding mechanism 100 further includes a vibrating element 4, which is fixed to the outer side of one of the side walls of the mixing chamber 2 along the Y-axis direction to vibrate the powder in the mixing chamber 2 in the Y-axis direction. The vibration of the powder in the mixing chamber 2 by the vibrating element 4 in the Y-axis direction helps to promote the thorough mixing and uniform distribution of powders of different components. Vibration can break up powder agglomerations, allowing the powders to better blend under the combined action of gravity and vibration, further improving the uniformity of powder mixing. This ensures that the powder falling from the powder feeding port has a consistent component ratio and better flowability, improving the quality of powder bed placement. Furthermore, vibrating the powder in the mixing chamber 2 in the Y-axis direction can minimize powder mixing in the X-axis direction, effectively ensuring the component gradient of the powder in the X-axis direction.

[0044] In a preferred embodiment, the multi-material powder bed laying device further includes a flexible scraper mechanism 5. The flexible scraper mechanism 5 includes a wiping cotton 51, a scraper support 52, a scraper 53, a scraper central shaft 54, a scraper slide, and a dust collection assembly 55. The scraper support 52 is movable along the Y-axis. The scraper central shaft 54 ​​is rotatably connected to the scraper support 52 and is parallel to the X-axis. The scraper 53 is fixedly sleeved on the outside of the scraper central shaft 54. The wiping cotton 51 has the same length as the scraper 53 in the X-axis direction and contacts and partially wraps the top of the scraper. The dust collection assembly 55 is connected to the scraper support 52 to clean the powder bed that may not yet be formed. In the flexible scraper mechanism 5, the scraper support 52 can move along the Y-axis, facilitating powder laying and cleaning operations at different locations. The arrangement of the scraper central shaft 54 ​​and the scraper enables effective leveling and smoothing of the powder. The wiping cotton 51 partially wraps around the top of the scraper, allowing for timely cleaning of powder adsorbed on the scraper surface after the powder bed is laid. This prevents cross-contamination between different powder components and improves the cleanliness of the powder bed. The dust collection component 55 cleans the powder bed, removing residual impurities and further enhancing its quality, providing a good foundation for subsequent molding processes.

[0045] In a preferred embodiment, the vacuuming device provides uniform suction. To ensure the consistency, stability, and uniformity of suction at all locations within the vacuuming structure, its air duct structure includes a main air duct 551, a primary air duct 552, a secondary air duct 553, a tertiary air duct 554, and a quaternary air duct 555. Specifically, the main air duct 551 has an uppermost opening, the primary air duct 552 has a two-channel structure, the secondary air duct 553 has a four-channel structure, the tertiary air duct 554 has a six-channel structure, and the quaternary air duct 555 has an eight-channel structure, covering the integrated molding area. Figure 6 As shown. To further standardize the structural design of vacuum cleaners, the smallest unit of the device should be ≤2mm, the wall thickness of the device structure should be ≤0.5mm, and the suction force F at the suction port of the vacuum cleaner should be greater than the weight of the largest powder particle, i.e., F≥ρ*4 / 3πr3 (r>53μm, usually rounded to 60μm for calculation).

[0046] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A multi-material powder bed deposition apparatus, characterized by: The application relates to a powder-falling mechanism (100) for moving along a Y-axis direction in a horizontal direction, which comprises a powder-filling bin (1), a separation belt (11), a stirring bin (2), a stirring part and a powder-falling port control assembly (3), the separation belt (11) is arranged in the powder-filling bin (1) to separate the powder-filling bin (1) into multiple powder-filling chambers in the Y-axis direction, the multiple powder-filling chambers are used for filling powders of different components respectively, the stirring bin (2) is arranged below the powder-filling bin (1) and communicates with the powder-filling bin (1), the stirring part is arranged in the stirring bin (2) and can mix the powders of different components entering the stirring bin (2) in the Y-axis direction, the powder-falling port control assembly (3) is arranged at the bottom of the stirring bin (2), the powder-falling port control assembly (3) is formed with a powder-falling port communicating with the stirring bin (2), and the powder-falling port control assembly (3) can control the size of the powder-falling port in an X-axis direction and control the movement of the powder-falling port in the X-axis direction, the X-axis direction is perpendicular to the Y-axis direction in the horizontal direction. The powder-falling mechanism (100) further comprises a first sliding part and a second sliding part, the powder-filling bin (1) has oppositely arranged first and second side walls in the X-axis direction, the first sliding part is slidably connected with the first side wall in the Y-axis direction and can keep the position after sliding, the second sliding part is slidably connected with the second side wall in the Y-axis direction and can keep the position after sliding, the separation belt (11) is made of a material with telescopic performance, one end of the separation belt (11) is fixedly connected with the first sliding part, and the other end is fixedly connected with the second sliding part.

2. The multi-material powder bed-deposited device of claim 1, wherein: The separation belt (11) is made of hard rubber material.

3. The multi-material powder bed-deposited device of claim 2, wherein: The first sliding part comprises a first fixed block (12), a first sliding block (13), a first screw rod (14) and a first motor (15), the bottom of the first side wall is provided with a first sliding channel (16) in the Y-axis direction, the first sliding block (13) is slidably connected in the first sliding channel (16), the top of the first sliding block (13) is fixedly connected with the first fixed block (12), the first fixed block (12) is used for being fixedly connected with one end of the separation belt (11), the middle part of the first sliding block (13) is provided with a first threaded hole in the Y-axis direction, the first motor (15) is fixedly connected to the outside of the powder-filling bin (1), one end of the first screw rod (14) is fixedly connected with the output shaft of the first motor (15), the other end is rotationally connected with the first sliding channel (16), and the first screw rod (14) is threadedly connected with the first threaded hole to drive the first sliding block (13) to move in the first sliding channel (16).

4. The multi-material powder bed-deposited device of claim 3, wherein: ​ 5. The multi-material powder bed-deposited device of claim 4, wherein: The second sliding piece comprises a second fixed block (17), a second sliding block, a second screw rod and a second motor, the bottom of the second side wall is provided with a second sliding channel in the Y-axis direction, the second sliding block is slidingly connected in the second sliding channel, the top of the second sliding block is fixedly connected with the second fixed block (17), the second fixed block (17) is used for being fixedly connected with one end of the partition belt (11), the middle part of the second sliding block is provided with a second threaded hole in the Y-axis direction, the second motor is fixedly connected to the outside of the powder filling bin (1), one end of the second screw rod is fixedly connected with the output shaft of the second motor, the other end is rotationally connected with the second sliding channel, and the second screw rod is threadedly connected with the second threaded hole to drive the second sliding block to move in the second sliding channel.

6. The multi-material powder bed-deposited device of claim 1, wherein: The stirring piece comprises a plurality of mixing rollers (21), each mixing roller (21) is arranged in the stirring bin (2), and each mixing roller (21) can move along the respective axis. The axis of the mixing roller (21) is arranged in parallel with the X-axis direction.

7. The multi-material powder bed-deposited device of claim 6, wherein: Each mixing roller (21) is located in the same horizontal plane, the distance between adjacent mixing rollers (21) is h, and 3mm < h ≤ 5mm is satisfied. The surface roughness of the mixing roller (21) is Ra, and 6.3μm < Ra ≤ 12.5μm is satisfied.

8. The multi-material powder bed-deposited device of claim 7, wherein: The falling powder port control assembly (3) comprises a first partition plate (31), a first toothed plate, a third motor (32), a first gear, a second partition plate (33), a second toothed plate, a fourth motor (34) and a second gear. The bottom of the stirring bin (2) is provided with a third sliding channel (22) and a fourth sliding channel (23) arranged in the X-axis direction on both sides. The first partition plate (31) and the second partition plate (33) are slidingly connected with the third sliding channel (22) and the fourth sliding channel (23) on both sides, respectively. The first partition plate (31) and the second partition plate (33) are arranged in the X-axis direction and form the falling powder port between them. The first toothed plate is fixedly connected to the top of the first partition plate (31). The third motor (32) is fixedly connected to the outer side wall of the stirring bin (2). The first gear is fixedly connected with the output shaft of the third motor (32). The first gear is meshingly connected with the first toothed plate to drive the first toothed plate to move in the X-axis direction. The second toothed plate is fixedly connected to the top of the second partition plate (33). The fourth motor (34) is fixedly connected to the outer side wall of the stirring bin (2) away from the third motor (32). The second gear is fixedly connected with the output shaft of the fourth motor (34). The second gear is meshingly connected with the second toothed plate to drive the second toothed plate to move in the X-axis direction.

9. The multi-material powder bed-deposited device of claim 8, wherein: The falling powder mechanism (100) further comprises a vibrating piece (4) fixed to the outside of one of the side walls of the stirring bin (2) arranged correspondingly in the Y-axis direction to vibrate the powder in the stirring bin (2) in the Y-axis direction.

10. The multi-material powder bed-deposited device of claim 1, wherein: Further comprising a flexible scraper mechanism (5), the flexible scraper mechanism (5) comprises a wiping cotton (51), a scraper support (52), a scraper (53), a scraper center shaft (54) and a dust suction assembly (55), the scraper support (52) is movable along the Y-axis direction, the scraper center shaft (54) is rotationally connected to the scraper support (52), and the scraper center shaft (54) is arranged in parallel with the X-axis direction, the scraper (53) is fixedly sleeved on the outer side of the scraper center shaft (54), the wiping cotton (51) is the same length as the scraper (53) in the X-axis direction, and the wiping cotton (51) is in contact with the scraper and half-wraps the top of the scraper (53), and the dust suction assembly (55) is connected with the scraper support (52) to clean the powder bed that can not be formed.

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