Metal 3D printing powder scraping device

Abstract

The invention belongs to the technical field of metal 3D printing, and particularly relates to a metal 3D printing powder scraping device which comprises a translation mechanism, a powder spreading hopper and a movable cover plate. The translation mechanism comprises a moving seat, and one end of the powder spreading hopper is provided with a mounting part connected with the moving seat; a cavity is formed in the powder spreading hopper, a partition plate is arranged in the cavity in the width direction, and the cavity is divided into two spaced powder spreading bins through the partition plate. Scrapers are arranged at the bottom ends of the partition plates; the movable cover plate is arranged on the top side of the powder spreading hopper in a sliding mode, and two guide cavities are formed in the movable cover plate; a limiting piece is arranged on the powder spreading hopper, the movable cover plate is connected with an elastic reset piece, the elastic force of the elastic reset piece enables the movable cover plate to abut against the limiting piece, a powder storage cavity is formed by one guide cavity and the top side of the partition plate, and the other guide cavity is located on the top side of one powder spreading bin. A thrust part is arranged at the end, closer to the limiting part, of the translation mechanism, the translation mechanism drives the powder spreading hopper to move to the thrust part, the thrust part limits the movable cover plate and moves, and the guide cavity forming the powder storage cavity moves to the top side of the other powder spreading bin.

Description

Technical Field

[0001] The invention belongs to the technical field of additive equipment, and in particular relates to a metal 3D printing powder scraping device. Background Art

[0002] The most common form of metal 3D printing is powder bed fusion, a process that uses a heat source to fuse powder particles together point by point, layer by layer until the object is completed. During this process, a scraper is often used to spread the metal powder evenly and flatly on the forming cylinder.

[0003] The Chinese invention application patent document with publication number CN117259789A discloses a powder supply and bidirectional powder spreading device for a top-powder-feeding 3D printer, including a hopper, a powder spreading box is arranged below the hopper, a switch valve is arranged between the hopper and the powder spreading box, and the switch valve is fixedly connected to the hopper, a diverter is installed inside the powder spreading box, the diverter is fixedly connected to the powder spreading box, powder falling door strips are symmetrically installed on both sides of the powder spreading box, the powder falling door strips are arranged below the diverter, and the powder falling door strips are rotatably connected to the powder spreading box, and a scraper is also installed in the middle of the lower end surface of the powder spreading box, and the scraper is fixedly connected to the powder spreading box. When it is needed, a powder box can be set below the hopper to facilitate stable powder supply through the hopper. The lower end of the hopper is set to a cone-like structure, which is convenient for better feeding through the hopper during use, so that the powder can be stably discharged into the powder box at the lower end along the hopper. At the same time, a switch valve is installed between the hopper and the powder box to facilitate better control of the on-off status between the hopper and the powder box, and then the powder can be stably controlled to be discharged into the powder box during use, so as to achieve the purpose of quantitative control, and a diverter is installed inside the powder box to ensure that the powder enters the powder box from the hopper. The powder can be diverted by the diverter to ensure that the powder can slide down evenly. At the same time, by installing a powder door strip in the powder spreading box, the powder door strip and the powder spreading box can cooperate to form a closed cavity. The powder door strips at both ends can ensure that two cavities can be formed on both sides. The powder door strip is rotatably installed on the inner side of the powder spreading box and can be controlled by the driving mechanism. In this way, the driving mechanism can be used to control the powder door strip to rotate and open during use, ensuring that the powder falls from the cavity onto the printing table, and then the scraper is used to flatten the powder to complete the printing work.

[0004] In the technical solution disclosed in the above patent document, powder is filled on one side and spread twice, so the efficiency of spreading powder can be improved. However, a driving mechanism is used to control the powder falling, and the driving mechanism is one of a telescopic motor, a cylinder, a hydraulic cylinder and an electric cylinder. Therefore, the structural complexity of the powder spreading mechanism is increased, and the cost is increased. In addition, metal powder can easily enter the driving mechanism, causing the driving mechanism to get stuck and other problems. Summary of the invention

[0005] The object of the present invention is to provide a metal 3D printing powder scraping device, which is used to solve the problem that the existing metal 3D printing two-way powder spreading driving mechanism is easily jammed by powder.

[0006] To achieve the above-mentioned purpose, an embodiment of the present invention provides a metal 3D printing powder scraping device, which is arranged on a metal 3D printer and is used for spreading powder on the platform of the 3D printer, including a translation mechanism, a powder spreading hopper and a movable cover plate; the translation mechanism includes a movable seat, one end of the powder spreading hopper is provided with a mounting portion, and the mounting portion is connected to the movable seat; a cavity is provided in the powder spreading hopper, and a partition is provided in the cavity along the width direction, and the partition forms two mutually spaced powder spreading bins in the cavity, a feeding port is provided on the top side of the powder spreading bin, and a powder spreading port is provided at the bottom end, and a scraper is provided at the bottom end of the partition; the movable cover plate is slidably arranged on the top side of the powder spreading hopper, and two guide cavities are provided on the movable cover plate; the powder spreading hopper A limiting member is provided on the top, and the limiting member is provided with at least one limiting portion for limiting the movable cover plate; the movable cover plate is connected to an elastic reset member, and the elastic force of the elastic reset member causes the movable cover plate to abut against the limiting portion, and one of the guide cavities and the top side of the partition form a powder storage cavity, and the other guide cavity is located on the top side of one of the powder spreading bins; a thrust member is provided at the end of the translation mechanism closer to the limiting portion, and the translation mechanism drives the powder spreading hopper to move to the thrust member, so that the thrust member limits the movable cover plate and overcomes the elastic force of the elastic reset member, so that the movable cover plate and the powder spreading hopper are relatively displaced, and the guide cavity forming the powder storage cavity moves to the top side of the other powder spreading bin.

[0007] Furthermore, the translation mechanism includes two groups of linear modules, and the powder spreading hopper is supported on the two linear modules; both ends of the powder spreading hopper are provided with the limiting parts, and both ends of the movable cover are connected with an elastic reset part.

[0008] Furthermore, the linear module includes a guide rail seat, a guide rail and the movable seat, and a synchronous belt transmission mechanism; the guide rail is arranged on the guide rail seat, and the movable seat is arranged on the guide rail; the upper ends of both sides of the powder hopper are provided with support parts, and the support parts are supported on the movable seat; the synchronous belt transmission mechanism is arranged on the guide rail seat and connected to the movable seat; the two linear modules are connected to a drive assembly, and the drive assembly includes a transmission shaft connecting the two synchronous belt transmission mechanisms and a drive motor, and the drive motor is connected to the transmission shaft.

[0009] Furthermore, the limiting member extends two protrusions, and the inner side surface of one of the protrusions forms the limiting member; a guide rod is provided between the two protrusions, and the movable cover plate is provided with a guide hole, and the guide hole is sleeved on the guide rod; the elastic reset member is a compression spring sleeved on the guide rod.

[0010] Furthermore, a vertical plate is provided on the top side of the powder hopper, a slide groove is provided on the vertical plate, and a roller limited in the slide groove is provided on the end side of the movable cover plate; a first protrusion extends from one side of the vertical plate, and a second protrusion is provided on the top side of the movable cover plate, and the elastic reset member is a compression spring arranged between the first protrusion and the second protrusion.

[0011] Furthermore, a plurality of ribs are provided in the powder spreading bin along the width direction of the powder spreading hopper, and the ribs form a plurality of independent grille slots in the powder spreading bin.

[0012] Furthermore, a mounting groove is provided on the bottom side of the partition, and the mounting groove is used to install the scraper.

[0013] Furthermore, the scraper includes a blade holder and a scraper plate; a clamping groove is provided on the bottom side of the blade holder, and the scraper plate is clamped in the clamping groove; the blade holder is arranged in the mounting groove, a through hole is provided on one side of the powder hopper, and a screw hole is provided on the other side, and a locking screw passes through the through hole and the blade holder to be connected with the screw hole.

[0014] Furthermore, an adjustment space is provided on the top side of the knife seat and the mounting groove, an adjustment screw hole is provided on the top side of the knife seat, a countersunk hole is provided on the top side of the partition, and the adjustment screw passes through the countersunk hole and is connected to the adjustment screw hole; an air avoidance hole is provided on the movable cover plate to avoid the countersunk hole.

[0015] Furthermore, the translation mechanism drives the powder spreading hopper to move, and after the movable cover plate abuts against the thrust member and the movable cover plate moves and is misaligned with the powder spreading hopper, the translation mechanism drives the powder spreading hopper to move in the opposite direction, and the translation mechanism drives the powder spreading hopper to move at a speed greater than a speed at which the elastic reset member pushes the movable cover plate to reset, so that when the movable cover plate is reset, the movable cover plate hits the limit member, causing the powder spreading hopper to vibrate.

[0016] The above one or more technical solutions in the metal 3D printing powder scraping device provided by the embodiment of the present invention have at least the following technical effects:

[0017] The metal 3D printing powder scraping device of the present invention can be driven by a translation mechanism to move the powder hopper to the powder filling position, and the powder storage chamber of the powder filling device of the 3D printing mechanism is filled with metal powder; after the powder storage chamber is filled, the translation mechanism drives the powder hopper to move again, so that the powder hopper with an open mouth is located at the powder filling position, and the powder filling device can fill the metal powder into the powder hopper. When spreading powder, the moving mechanism drives the powder hopper to move, and the metal powder in the powder hopper can be evenly spread on the forming cylinder of the 3D printer. When the powder hopper moves to one end of the thrust member, the thrust member pushes the movable cover plate to overcome the elastic force of the elastic reset member as the powder hopper continues to move, so that the movable cover plate moves out of position, so that the metal powder in the powder storage chamber falls into another powder hopper, so when the moving mechanism drives the powder hopper to return to the powder filling position, the second powder spreading can be achieved. Therefore, the powder hopper can complete two powder spreadings after one reciprocating movement. The metal 3D printing powder scraping device does not have a driving device for switching powder spreading, which not only has a simpler structure and low cost, but also does not have the problem of getting stuck during the secondary powder spreading, thereby achieving stable powder spreading. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A structural diagram of a metal 3D printing powder scraping device provided in an embodiment of the present invention.

[0020] Figure 2 A structural diagram of a metal 3D printing powder scraping device provided in an embodiment of the present invention, in which a movable cover plate is arranged on a powder spreading hopper.

[0021] Figure 3 A top view of a movable cover plate of a metal 3D printing powder scraping device provided in an embodiment of the present invention being arranged on a powder spreading hopper.

[0022] Figure 4 A cross-sectional view of a movable cover plate of a metal 3D printing powder scraping device provided in an embodiment of the present invention being arranged on a powder spreading hopper.

[0023] Figure 5 A structural diagram of another embodiment of the metal 3D printing powder scraping device provided in an embodiment of the present invention.

[0024] Figure 6 for Figure 5 A partial enlarged view of .

[0025] Figure 7A structural diagram of the powder spreading hopper of the metal 3D printing powder scraping device provided in an embodiment of the present invention.

[0026] Figure 8 A structural diagram of the bottom portion of the powder spreading hopper of the metal 3D printing powder scraping device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0031] In one embodiment of the metal 3D printing powder scraping device of the present invention, please refer to Figures 1 to 8, a metal 3D printing powder scraping device is provided on a metal 3D printer and is used for spreading powder on the platform of the 3D printer. Specifically, the metal 3D printing powder scraping device of this embodiment includes a translation mechanism 100, a powder spreading hopper 200 and a movable cover plate 300. The translation mechanism 100 includes a movable seat 110, and a mounting portion is provided at one end of the powder spreading hopper 200, and the mounting portion is connected to the movable seat 110; therefore, the translation mechanism 100 can drive the powder spreading hopper 200 to translate back and forth. A cavity is provided in the powder spreading hopper 200, and a partition 210 is provided in the cavity along the width direction. The partition 210 divides the cavity into two mutually spaced powder spreading bins 201, and a feed port is provided on the top side of the powder spreading bin 201, and a powder spreading port is provided at the bottom end, so that metal powder can be loaded into the powder spreading bin 201 from the feed port, and when the powder spreading hopper 200 translates, the powder is spread on the forming cylinder of the 3D printer from the powder spreading port. A scraper 220 is provided at the bottom end of the partition 210, so when spreading the powder, the scraper 220 will scrape the powder flat. The movable cover plate 300 is slidably arranged on the top side of the powder spreading hopper 200, and two guide cavities 301 are provided on the movable cover plate 300. A limiting member 400 is provided on the powder spreading hopper 200, and the limiting member 400 is provided with at least one limiting portion 401 for limiting the movable cover plate 300. The movable cover plate 300 is connected to an elastic reset member 500, and the elastic force of the elastic reset member 500 causes the movable cover plate 300 to abut against the limiting portion 401, and one of the guide cavities 301 and the top side of the partition 210 form a powder storage cavity, and the other guide cavity 301 is located on the top side of one of the powder spreading bins 201. A thrust piece 600 is provided at one end of the translation mechanism 100 closer to the limiting portion 401. The translation mechanism 100 drives the powder spreading hopper 200 to move to the thrust piece 600, so that the thrust piece 600 limits the movable cover plate 300 and overcomes the elastic force of the elastic reset member 500, so that the movable cover plate 300 and the powder spreading hopper 200 are relatively displaced, forming the guide cavity 301 of the powder storage cavity to move to the top side of the other powder spreading bin 201.

[0032] Specifically, the metal 3D printing powder scraping device of this embodiment can be driven by the translation mechanism 100 to move the powder hopper 200 to the powder filling position, and the metal powder is filled in the powder storage chamber of the powder filling device of the 3D printing mechanism. After the powder storage chamber is filled, the translation mechanism 100 drives the powder hopper 200 to move again, so that the powder storage bin 201 with an open mouth is located at the powder filling position, and the powder filling device can fill the metal powder into the powder storage bin 201. When spreading the powder, the moving mechanism 100 drives the powder hopper 200 to move, and the metal powder in the powder storage bin 200 can be evenly spread on the forming cylinder of the 3D printer. When the powder hopper 200 moves to one end of the thrust member 600, the powder hopper 200 continues to move, and the thrust member 600 limits the movable cover plate 300, and pushes the movable cover plate 300 to overcome the elastic force of the elastic reset member 500, so that the movable cover plate 300 moves out of position, so that the metal powder in the powder storage chamber falls into another powder spreading bin 201, so when the moving mechanism 100 drives the powder hopper 200 to return to the powder filling position, the second powder spreading can be achieved. Therefore, the powder hopper can complete two powder spreadings by moving back and forth once. The metal 3D printing powder scraping device does not have a driving device for switching powder spreading, which not only has a simpler structure and low cost, but also does not have the problem of getting stuck during the second powder spreading, so that stable powder spreading can be achieved.

[0033] Further, refer to Figure 1 and Figure 5 , the translation mechanism 100 drives the powder hopper to move, the movable cover plate 300 abuts against the thrust member 600, and pushes the movable cover plate 300 to move and displace with the powder hopper 200. Therefore, the metal powder in the powder storage chamber falls into the powder bin 201. The translation mechanism 100 then drives the powder hopper 200 to move in the opposite direction by one end, so that the powder hopper 200 is located in the waiting area. When the translation mechanism 100 drives the powder hopper 200 to move to the waiting area, the speed at which the translation mechanism 100 drives the powder hopper 200 to move is greater than the speed at which the elastic reset member 500 pushes the movable cover plate 300 to reset. Therefore, the powder hopper 200 reaches the powder waiting position first, while the movable cover plate 300 lags behind the powder hopper 200. Therefore, when the movable rice cover 300 is reset, the movable cover plate 300 hits the limit member 400 back, causing the powder hopper 200 and the movable cover plate 300 to vibrate. The metal powder deposited on the surface of the movable cover plate 300 and the powder spreading hopper 200 can be shaken off, thereby preventing the metal powder deposited during the process of the movable mechanism 100 driving the powder spreading hopper 200 to move and spread powder from falling into the printing area of ​​the forming cylinder, thereby causing the printing to fail to be completed normally and resulting in the problem of the printed product being scrapped.

[0034] Furthermore, the translation mechanism 100 includes two sets of linear modules, and the powder hopper 200 is supported on the two linear modules. Both ends of the powder hopper 200 are provided with limit members 400, and both ends of the movable cover plate 300 are connected with an elastic reset member 500. This increases the stability of the powder hopper 200 and the movable cover plate 300.

[0035] Further, refer to Figure 1 and Figure 5 The linear module includes a guide rail seat 120, a guide rail 130, a moving seat 110, and a synchronous belt transmission mechanism 140. The guide rail 130 is arranged on the guide rail seat 120, and the moving seat 110 is arranged on the guide rail 130. The upper ends of both sides of the powder hopper 200 are provided with support parts 202, and the support parts 202 are supported on the moving seat 110. The synchronous belt transmission mechanism 140 is arranged on the guide rail seat 120 and connected to the moving seat 110. The two linear modules are connected to a driving assembly 150, and the driving assembly 150 includes a transmission shaft 151 connecting the two synchronous belt transmission mechanisms 140 and a driving motor 152, and the driving motor 152 is connected to the transmission shaft 151. In this embodiment, the driving motor 152 drives the transmission shaft 151, and the two synchronous belt transmission mechanisms 140 are driven by the transmission shaft 151, thereby driving the moving seat 110 and the powder hopper 200 to move along the guide rail 130.

[0036] Further, the movable cover plate 300 is slidably arranged on the top side of the powder hopper 200. For details, please refer to Figures 1 to 4 , the limiting member 400 extends two protrusions 410, and the inner side surface of one of the protrusions 410 forms a limiting portion 401; a guide rod 411 is provided between the two protrusions 410, and the movable cover plate 300 is provided with a guide hole, which is sleeved on the guide rod 411. The elastic reset member 500 is a compression spring sleeved on the guide rod 411. In this embodiment, the compression spring pushes one side of the movable cover plate 300 to abut against the protrusion 410, and when the thrust member 600 limits the movable cover plate 300, the movable cover plate 300 slides along the guide rod 411.

[0037] Further, another embodiment in which the movable cover plate 300 is slidably arranged on the top side of the powder spreading hopper 200 is described in detail. Figure 5 and Figure 6 , a vertical plate 230 is provided on the top side of the powder hopper 200, a slide groove 231 is provided on the vertical plate 230, and a roller 310 limited in the slide groove 231 is provided on the end side of the movable cover plate 300. A first protrusion 232 extends from one side of the vertical plate 230, a second protrusion 311 is provided on the top side of the movable cover plate 300, and the elastic reset member 500 is a compression spring arranged between the first protrusion 232 and the second protrusion 311. Furthermore, the limiting member 400 is arranged on the lower pin on the top side of the powder hopper 200. In this embodiment, the roller 310 is rollingly connected to the slide groove 231, so that the movable cover plate 300 and the powder hopper 200 can be connected in a relatively sliding manner.

[0038] For further information, please refer to Figure 7 and Figure 8 A plurality of ribs 202 are provided in the powder bunker 201 along the width of the powder bunker 200. The ribs 202 form a plurality of independent grille slots in the powder bunker 201, thereby dividing the powder bunker 201 into a plurality of independent small cavities. In this embodiment, when the powder bunker 200 moves to the powder filling position, the metal powder can be distributed and filled into each independent small cavity, and is limited in each independent small cavity. Therefore, in the process of powder filling and spreading, the uneven distribution of metal powder due to the influence of gravity, airflow and other factors can be avoided, thereby causing the problem of differences in powder thickness. Furthermore, the overall structure of the powder bunker 200 is formed by metal 3D printing.

[0039] Further, refer to Figure 4 and Figure 8 A mounting groove 211 is also provided on the bottom side of the partition 210 , and the mounting groove 211 is used for mounting the scraper 220 .

[0040] Further, refer to Figure 4 The scraper 220 includes a blade holder 221 and a scraper plate 222. A clamping groove 223 is provided on the bottom side of the blade holder 221, and the scraper plate 222 is clamped in the clamping groove 223. Specifically, locking screw holes are provided on both sides of the clamping groove 223, and the scraper plate 222 is locked in the clamping groove 223 by using the locking screws to cooperate with the locking screw holes. Further, the blade holder 221 is arranged in the installation groove 211, and a through hole is provided on one side of the powder hopper 200, and a screw hole is provided on the other side. The locking screw is passed through the through hole and the blade holder 221 and connected to the screw hole. Then the blade holder 221 is locked in the installation groove 211.

[0041] For further information, please refer to Figure 4 The top sides of the knife seat 221 and the mounting groove 211 are further provided with an adjustment space 203, the top side of the knife seat 221 is provided with an adjustment screw hole 224, the top side of the partition 210 is provided with a countersunk hole 212, and the adjustment screw 230 passes through the countersunk hole 212 and is connected to the adjustment screw hole 224. In this embodiment, the height position of the scraper 220 can be adjusted; specifically, the adjustment screw 230 cooperates with the adjustment screw hole 224 on the knife seat 221, so that the knife seat 221 can be adjusted up and down in the adjustment space 203.

[0042] Further, refer to Figure 2 and Figure 4 The movable cover plate 300 is provided with a clearance hole 302 for the clearance countersunk hole 212. Therefore, when adjusting the position of the scraper 220, it is not necessary to remove the movable cover plate 300, and the operation is convenient.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A metal 3D printing powder scraping device, provided on a metal 3D printer, used for spreading powder on the platform of the 3D printer, characterized in that: It comprises a translation mechanism, a powder spreading hopper and a movable cover plate; the translation mechanism comprises a movable seat, one end of the powder spreading hopper is provided with a mounting portion, and the mounting portion is connected to the movable seat; a cavity is provided in the powder spreading hopper, and a partition is provided in the cavity along the width direction, and the partition forms two mutually spaced powder spreading bins in the cavity, a feeding port is provided on the top side of the powder spreading bin, a powder spreading port is provided at the bottom end, and a scraper is provided at the bottom end of the partition; the movable cover plate is slidably arranged on the top side of the powder spreading hopper, and two guide cavities are provided on the movable cover plate; a limiter is provided on the powder spreading hopper, and the limiter is provided with at least one limiter for limiting the position of the movable cover plate; the movable cover plate is connected with an elastic reset member, the elastic force of the elastic reset member causes the movable cover plate to abut against the limiting portion, and one of the guide cavities and the top side of the partition form a powder storage cavity, and the other guide cavity is located on the top side of one of the powder spreading bins; a thrust member is provided at one end of the translation mechanism closer to the limiting portion, and the translation mechanism drives the powder spreading hopper to move to the thrust member, so that the thrust member limits the movable cover plate and overcomes the elastic force of the elastic reset member, so that the movable cover plate and the powder spreading hopper are relatively displaced, and the guide cavity forming the powder storage cavity moves to the top side of the other powder spreading bin.

2. The metal 3D printing powder scraping device according to claim 1, characterized in that: The translation mechanism includes two groups of linear modules, and the powder spreading hopper is supported on the two linear modules; both ends of the powder spreading hopper are provided with the limiting parts, and both ends of the movable cover are connected with an elastic reset part.

3. The metal 3D printing powder scraping device according to claim 2, characterized in that: The linear module includes a guide rail seat, a guide rail and the moving seat, and a synchronous belt transmission mechanism; the guide rail is arranged on the guide rail seat, and the moving seat is arranged on the guide rail; the upper ends of both sides of the powder hopper are provided with support parts, and the support parts are supported on the moving seat; the synchronous belt transmission mechanism is arranged on the guide rail seat and connected to the moving seat; the two linear modules are connected to a drive assembly, and the drive assembly includes a transmission shaft connecting the two synchronous belt transmission mechanisms and a drive motor, and the drive motor is connected to the transmission shaft.

4. The metal 3D printing powder scraping device according to claim 1, characterized in that: The limiting member extends two protrusions, and the inner side surface of one of the protrusions forms the limiting member; a guide rod is provided between the two protrusions, and the movable cover plate is provided with a guide hole, and the guide hole is sleeved on the guide rod; the elastic reset member is a compression spring sleeved on the guide rod.

5. The metal 3D printing powder scraping device according to claim 1, characterized in that: A vertical plate is provided on the top side of the powder hopper, a slide groove is provided on the vertical plate, and a roller limited in the slide groove is provided on the end side of the movable cover plate; a first protrusion extends from one side of the vertical plate, a second protrusion is provided on the top side of the movable cover plate, and the elastic reset member is a compression spring arranged between the first protrusion and the second protrusion.

6. The metal 3D printing powder scraping device according to any one of claims 1 to 5, characterized in that: A plurality of ribs are arranged in the powder spreading bin along the width direction of the powder spreading hopper, and the ribs form a plurality of independent grille slots in the powder spreading bin.

7. The metal 3D printing powder scraping device according to any one of claims 1 to 5, characterized in that: The bottom side of the partition is also provided with a mounting groove, and the mounting groove is used for mounting the scraper.

8. The metal 3D printing powder scraping device according to claim 7, characterized in that: The scraper includes a blade holder and a scraper plate; a clamping groove is provided on the bottom side of the blade holder, and the scraper plate is clamped in the clamping groove; the blade holder is arranged in the mounting groove, a through hole is provided on one side of the powder hopper, and a screw hole is provided on the other side, and a locking screw passes through the through hole and the blade holder and is connected to the screw hole.

9. The metal 3D printing powder scraping device according to claim 8, characterized in that: An adjustment space is also provided on the top side of the knife seat and the mounting groove, an adjustment screw hole is provided on the top side of the knife seat, a countersunk hole is provided on the top side of the partition, and the adjustment screw passes through the countersunk hole and is connected to the adjustment screw hole; an air avoidance hole is provided on the movable cover plate to avoid the countersunk hole.

10. The metal 3D printing powder scraping device according to any one of claims 1 to 5, characterized in that: The translation mechanism drives the powder spreading hopper to move, and after the movable cover plate abuts against the thrust member and the movable cover plate moves and is misaligned with the powder spreading hopper, the translation mechanism drives the powder spreading hopper to move in the opposite direction, and the translation mechanism drives the powder spreading hopper to move at a speed greater than the speed at which the elastic reset member pushes the movable cover plate to reset, so that when the movable cover plate is reset, the movable cover plate hits the limit member, causing the powder spreading hopper to vibrate.

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