A multi-material powder spreading device for laser additive manufacturing

Abstract

The application relates to the field of laser additive manufacturing, and discloses a multi-material powder laying device for laser additive manufacturing, which comprises a motorized guide rail, the surface of the motorized guide rail is slidably connected with two groups of guide seats, the top ends of the two groups of guide seats are fixedly connected with a moving seat, and the top end of the moving seat is provided with a powder blocking prevention mechanism. The powder blocking prevention mechanism improves the powder quality through cooperation of a stirring shaft and a storage box transverse movement, that is, while a motor drives a quantitative powder laying roller, the stirring shaft is driven to rotate in a storage cavity through a belt drive, the main drive shaft drives the storage box to reciprocatingly move transversely through the action of a convex rod and an annular corrugated groove, double scattering effects of rotary stirring and transverse shaking are formed, the storage box transverse movement is synchronously linked with stirring, powder is ensured to be in a dispersed state during discharging, the quantitative powder laying roller is connected with the two side cavities of the storage box through forward and reverse rotation switching, and accurate material taking of two kinds of materials is realized.

Description

Technical Field

[0001] This invention relates to the field of laser additive manufacturing technology, specifically to a multi-material powder spreading device for laser additive manufacturing. Background Technology

[0002] Laser additive manufacturing, also known as laser 3D printing, is one of the core branches of additive manufacturing. It is an advanced manufacturing technology that uses lasers as an energy source to directly transform raw materials such as metal and non-metal powders or filaments into three-dimensional solid parts through a layer-by-layer melting and solidification deposition process. Essentially, it is a direct manufacturing process from digital models to physical entities, which is in stark contrast to traditional subtractive manufacturing methods such as cutting and grinding.

[0003] In laser additive manufacturing, multi-material powder spreading equipment is the core equipment for forming composite components of dissimilar materials. Its performance directly affects the density, mechanical properties and forming efficiency of the components.

[0004] However, the metal or non-metal powders used in laser additive manufacturing (such as titanium alloy powder and resin powder) are prone to agglomeration due to environmental humidity or static electricity. Traditional storage structures lack effective anti-agglomeration measures. After the powder accumulates and clumps in the storage box, it will block the discharge port or cause uneven powder distribution. Although some devices have added stirring mechanisms, they mostly rotate in one direction and cannot completely disperse the agglomerated particles. Moreover, the stirring and discharge are not synchronized, and there is still a risk that local agglomerates will enter the processing table, resulting in defects such as pores and inclusions in the molded components. Summary of the Invention

[0005] The purpose of this invention is to solve the problems mentioned in the background art, and thus propose a multi-material powder spreading device for laser additive manufacturing. This invention improves powder quality through a synergistic anti-caking mechanism involving a stirring shaft and a lateral movement of the storage box: While the motor drives the quantitative spreading roller, the stirring shaft rotates within the storage cavity via a belt drive. This, combined with the main drive shaft's action through a convex rod and an annular corrugated groove, causes the storage box to move reciprocally laterally, creating a dual dispersing effect of rotational stirring and lateral shaking. The lateral movement of the storage box and the stirring are synchronized, ensuring that the powder remains dispersed throughout the feeding process. The quantitative spreading roller, by switching between forward and reverse rotation, connects with the cavities on both sides of the storage box, achieving precise picking of both materials and avoiding blockages and contamination caused by manual intervention.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A multi-material powder spreading device for laser additive manufacturing includes an electric guide rail. Two sets of guide seats are slidably connected to the surface of the electric guide rail. A movable seat is fixedly connected to the top of the two sets of guide seats. An anti-caking powder mechanism is provided at the top of the movable seat, and a layer-by-layer lifting and scraping mechanism is provided on the inner wall of the bottom of the movable seat. The anti-caking powder mechanism is used to vibrate and stir the two powders of laser additive manufacturing to prevent them from agglomerating. The layer-by-layer lifting and scraping mechanism is used to scrape the powder layer by layer during the powder spreading process.

[0008] Preferably, the anti-caking mechanism includes a motor, the output shaft of which is fixedly connected to a metering roller, and a storage box is slidably connected to the top surface of the movable seat. The storage box has two sets of storage cavities inside, and stirring shafts are rotatably connected to the inner walls of the storage cavities on both sides of the storage box. The rotation center shafts of the two sets of stirring shafts are fixedly connected to pulleys a. The inner wall of the left pulley a is rotatably connected to a main drive shaft, and a pulley b is slidably connected to the surface of the main drive shaft. The pulley b is connected to a pulley c via a belt drive.

[0009] Preferably, the end of the storage box away from the main drive shaft is fixedly connected to a secondary support shaft, and the outer arc surface of the secondary support shaft is slidably connected to a support frame a.

[0010] Preferably, the support frame a is fixedly connected to the left side wall of the movable seat, and the end of the movable seat away from the support frame a is fixedly connected to the support frame b. The inner side wall of the support frame b is provided with an annular corrugated groove, and the outer arc surface of the main drive shaft is fixedly connected to a protruding rod, which is slidably connected to the inner side wall of the annular corrugated groove of the support frame b.

[0011] Preferably, a support rod is fixedly connected to the inner sidewall of the support frame b, and an annular groove is formed on the surface of the pulley b. The end of the support rod away from the support frame b is slidably connected to the inner sidewall of the annular groove of the pulley b.

[0012] Preferably, the main drive shaft passes through and is slidably connected to the inner side wall of the support frame b, and the rotation center axis of the pulley c is fixedly connected to the rotation center axis of the quantitative spreading roller.

[0013] Preferably, the motor is fixedly connected to the outer side wall of the movable seat, the two sets of pulleys a are connected by belt drive, the two sets of pulleys a are rotatably connected to the right side wall of the storage box, and the main drive shaft is rotatably connected to the outer side wall of the storage box.

[0014] Preferably, the layer-by-layer lifting scraping mechanism includes multi-level contact blocks, with four sets of multi-level contact blocks arranged in a mirror image and fixed at the four corners of the electric guide rail. A connecting frame is slidably connected through the inner wall of the bottom end of the movable seat. Scrapers are fixedly connected to both sides of the connecting frame. Multiple sets of triangular blocks are elastically connected to the inner sidewall of the scraper through a return spring. An electric telescopic rod is fixedly connected to the upper side of the front surface of the movable seat. A connecting seat is fixedly connected to the telescopic end of the electric telescopic rod. An abutment block is fixedly connected to the outer surface of one set of scrapers.

[0015] Preferably, one end of the reset spring is fixedly connected to the inner sidewall of the scraper, and the other end of the reset spring is fixedly connected to the rear end of the triangular block.

[0016] Preferably, the triangular block is slidably connected to the inner sidewall of the scraper, the inner sidewall of the bottom end of the movable seat is provided with a slot, the outer wall of the triangular block is engaged with the inner wall of the slot, the outer sidewall of the connecting frame is in contact with the surface of the multi-level contact block, and the lower surface of the connecting seat is in contact with the surface of the abutment block.

[0017] The present invention has the following beneficial effects:

[0018] 1. This invention improves powder quality through a synergistic anti-caking mechanism involving the lateral movement of a stirring shaft and a storage box: While the motor drives the quantitative spreading roller, the belt drives the stirring shaft to rotate within the storage cavity. This, combined with the main drive shaft's action via a convex rod and an annular corrugated groove, causes the storage box to reciprocate laterally, creating a dual dispersing effect of rotational stirring and lateral swaying. The lateral movement of the storage box is synchronized with the stirring, ensuring the powder remains dispersed throughout the feeding process. The quantitative spreading roller, by switching between forward and reverse rotation, connects with the cavities on both sides of the storage box, achieving precise material handling for both materials and avoiding blockages and contamination caused by manual intervention.

[0019] 2. This invention achieves material switching without downtime by relying on a quantitative spreading roller and a linkage transmission: the motor drives the quantitative spreading roller to rotate forward or backward, aligning its cavity with the corresponding material storage cavity's discharge port. The two independent cavities of the storage box achieve physical isolation between the two materials. Combined with the precise material picking by the quantitative spreading roller, the transmission system links quantitative spreading with anti-caking action. No additional power source is required, the equipment has a compact structure, and it is suitable for the continuous production needs of multi-material gradient components.

[0020] 3. This invention achieves dynamic adjustment of scraper height through multi-level contact blocks and elastic locking. When the moving seat spreads powder back and forth, the scrapers on both sides simultaneously scrape the powder in both directions, avoiding secondary accumulation caused by single-pass leveling. When it moves to the end of the electric guide rail, the connecting frame contacts the multi-level contact blocks, pushing the scraper upward. The triangular block automatically locks into the higher slot through the reset spring, achieving precise lifting of the scraper height after each layer of powder is spread. After processing, the electric telescopic rod drives the scraper to reset with one key. The operation is convenient and effectively ensures the dimensional accuracy and interlayer bonding strength of multi-layer components.

[0021] 4. This invention uses an anti-caking powder mechanism to vibrate and stir the two powders used in laser additive manufacturing to prevent them from agglomerating, and uses a layer-by-layer lifting and scraping mechanism to scrape the powder layer by layer during the powder spreading process, thereby improving the powder spreading effect. Attached Figure Description

[0022] Figure 1 This is an overall perspective view of the present invention;

[0023] Figure 2 This is a schematic diagram of the electric guide rail and guide seat separated in the present invention;

[0024] Figure 3 This is a partial cross-sectional schematic diagram of the storage box and the movable seat of the present invention;

[0025] Figure 4 This is a schematic diagram of the storage box and the movable seat in the separated state of the present invention;

[0026] Figure 5 This is a partial cross-sectional view of the support frame b of the present invention;

[0027] Figure 6 This is a partial cross-sectional view of the scraper of the present invention.

[0028] in:

[0029] 1. Electric guide rail; 2. Guide seat; 3. Movable seat;

[0030] 4. Anti-caking mechanism; 401. Motor; 402. Metering roller; 403. Storage box; 404. Mixing shaft; 405. Pulley a; 406. Main drive shaft; 407. Secondary support shaft; 408. Support frame a; 409. Support frame b; 410. Support rod; 411. Pulley b; 412. Pulley c; 413. Protruding rod;

[0031] 5. Layer-by-layer lifting and scraping mechanism; 501. Multi-stage contact block; 502. Connecting frame; 503. Scraper; 504. Return spring; 505. Triangular block; 506. Electric telescopic rod; 507. Connecting seat; 508. Abutment block. Detailed Implementation

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

[0033] Example:

[0034] like Figures 1-6 As shown, this embodiment of the invention provides a multi-material powder spreading device for laser additive manufacturing. An electric guide rail 1 has two sets of guide seats 2 slidably connected to its surface. The electric guide rail 1 is a prior art device, which can be fixed to the laser additive processing table with bolts. Driven by the electric guide rail 1, the two sets of guide seats 2 can move a movable seat 3 on the surface of the electric guide rail 1. A movable seat 3 is fixedly connected to the top of the two sets of guide seats 2. An anti-caking powder mechanism 4 is provided at the top of the movable seat 3. A layer-by-layer lifting and scraping mechanism 5 is provided on the inner wall of the bottom of the movable seat 3. The anti-caking powder mechanism 4 is used to vibrate and stir the two powders used in laser additive manufacturing to prevent them from agglomerating. The layer-by-layer lifting and scraping mechanism 5 is used to scrape the powder layer by layer during the spreading process.

[0035] like Figures 3-5 As shown, the anti-caking powder mechanism 4 includes a motor 401, which is fixedly connected to the outer side wall of the movable seat 3. The output shaft of the motor 401 is fixedly connected to a quantitative spreading roller 402. A cavity is opened on the inner side of the quantitative spreading roller 402, and a slot is opened on the upper surface of the movable seat 3 corresponding to the discharge ports of the two sets of storage cavities of the storage box 403. Driven by the motor 401, the quantitative spreading roller 402 can be rotated forward or backward to align the cavity on its surface with the discharge port of a storage cavity on one side, so that the powder will fall into the inner side of the quantitative spreading roller 402. After receiving the powder, the quantitative spreading roller 402 is driven to rotate in the opposite direction, so that the notch of the cavity faces downward. With the drive of the electric guide rail 1, the guide seat 2 drives the movable seat 3 to move, so that the powder is evenly spread on the processing table for laser additive processing.

[0036] A storage box 403 is slidably connected to the top surface of the movable seat 3. The width of the discharge port at the bottom of the storage box 403 matches the width of the empty slot at the top of the movable seat 3, and its length is longer than the empty slot. The storage box 403 can only move laterally on the upper surface of the movable seat 3. A secondary support shaft 407 is fixedly connected to the end of the storage box 403 away from the main drive shaft 406. A support frame a408 is slidably connected through the outer arc surface of the secondary support shaft 407. The support frame a408 is fixedly connected to the left side wall of the movable seat 3. By setting the secondary support shaft 407 and the support frame a408, the movement of the storage box 403 can be guided, so that it can only move laterally. A storage box 403 is fixedly connected to the end of the movable seat 3 away from the support frame a408. A support frame b409 has a support rod 410 fixedly connected to its inner sidewall. An annular groove is formed on the surface of the pulley b411. The end of the support rod 410 away from the support frame b409 is slidably connected to the inner sidewall of the annular groove of the pulley b411. The function of the support rod 410 is to provide rotational support for the position of the pulley b411, so that it can only rotate circumferentially on the surface of the main drive shaft 406. At the same time, it allows the main drive shaft 406 to move back and forth at the center of the pulley b411. Furthermore, an inner groove that fits the outer arc surface of the main drive shaft 406 is formed at the center of the pulley b411, so that when the pulley b411 rotates, it will drive the main drive shaft 406 to rotate synchronously.

[0037] The inner sidewall of the support frame b409 has an annular corrugated groove. A protruding rod 413 is fixedly connected to the outer arc surface of the main drive shaft 406. The protruding rod 413 is slidably connected to the inner sidewall of the annular corrugated groove of the support frame b409. When the main drive shaft 406 is driven to rotate by the pulley b411, the pulley b411 will drive the main drive shaft 406 to rotate synchronously. The main drive shaft 406 will drive the protruding rod 413 to move. At the same time, the protruding rod 413 also slides on the inner wall of the annular corrugated groove of the support frame b409, so that the protruding rod 413 will drive the main drive shaft 406 to reciprocate laterally, thereby pushing the storage box 403 to move. The upper surface of seat 3 moves laterally to prevent the powder inside seat 3 from becoming damp and accumulating. The storage box 403 has two sets of storage cavities. A stirring shaft 404 is rotatably connected to the inner walls of the storage cavities on both sides of the storage box 403. The rotation center shafts of both stirring shafts 404 are fixedly connected to pulleys a405. When the two pulleys a405 rotate, they drive the stirring shafts 404 to rotate inside the storage cavities of the storage box 403, thereby dispersing the powder and preventing moisture condensation that would affect the final laser additive manufacturing. The inner wall of the left pulley a405 is rotatably connected to the main drive shaft. 406. The inner side of the left pulley a405 has a groove that matches the outer arc surface of the main drive shaft 406. This allows the main drive shaft 406 to rotate synchronously with pulley b411, driving pulley a405 to rotate as well. The two sets of pulleys a405 are connected by a belt drive. Both sets of pulleys a405 are rotatably connected to the right side wall of the storage box 403. The main drive shaft 406 is rotatably connected to the outer side wall of the storage box 403. The main drive shaft 406 can only rotate circumferentially within the side wall of the storage box 403. When the main drive shaft 406 moves, it drives the storage box 403 to move synchronously. The drive shaft 406 passes through and is slidably connected to the inner side wall of the support frame b409. The function of the support frame b409 is to provide rotational support for the main drive shaft 406. A pulley b411 passes through and is slidably connected to the surface of the main drive shaft 406. The pulley b411 is connected to the pulley c412 via belt drive. The rotation center axis of the pulley c412 is fixedly connected to the rotation center axis of the quantitative spreading roller 402. When the motor 401 drives the quantitative spreading roller 402 to rotate so that the two sets of powder are switched and quantitatively spread, it will also drive the pulley c412 to rotate synchronously, thereby realizing linkage transmission.

[0038] like Figure 6As shown, the layer-by-layer lifting scraping mechanism 5 includes multi-level contact blocks 501. Four sets of multi-level contact blocks 501 are arranged in a mirror image and fixed at the four corners of the electric guide rail 1. Each multi-level contact block 501 consists of a rod and four sets of triangles. The gap between each triangle matches the rear end of the connecting frame 502, and the thickness of the four triangles is adapted to the triangular block 505. The connecting frame 502 is slidably connected through the inner wall of the bottom of the movable seat 3. A guide groove is provided on the inner wall of the bottom of the movable seat 3, allowing the connecting frame 502 to move linearly up and down only along the inner wall of the guide groove at the bottom of the movable seat 3. The return spring 504 is fixedly connected at one end to the inner side wall of the scraper 503 and at the other end to the rear end of the triangular block 505. The function of the return spring 504 is to reset the position of the triangular block 505 after it has been moved by the inner groove of the moving seat 3. Scrapers 503 are fixedly connected to both sides of the connecting frame 502. By providing scrapers 503 on both sides of the connecting frame 502, when the electric guide rail 1 drives the guide seat 2 and the moving seat 3 to move as a whole to apply powder to the surface of the processing table, moving to the left or right can scrape the powder evenly.

[0039] The inner sidewall of the scraper 503 is elastically connected to multiple sets of triangular blocks 505 via a return spring 504. The triangular blocks 505 are slidably connected to the inner sidewall of the scraper 503. A slot is provided on the inner sidewall of the bottom of the moving seat 3. The outer wall of the triangular block 505 engages with the inner wall of the slot. The triangular block 505 is a sideways-placed triangle. This engagement allows the scraper 503 to be fixed in multiple positions as it moves with the connecting frame 502. The position of the scraper 503 will not change under the influence of external forces. The outer sidewall of the connecting frame 502 contacts the surface of the multi-stage contact block 501. When the moving seat 3 moves the connecting frame 502, regardless of whether it moves to the left or right to spread powder, when it reaches the end of the electric guide rail 1, it will pass through the triangle corresponding to the connecting frame 502 at the multi-stage contact block 501. The extrusion connecting frame 502 drives the scraper 503 to rise, and the rising position of the scraper 503 is fixed by the triangular block 505. This allows the initial height of the scraper 503 to increase by one level with each layer of powder, thus dynamically adjusting according to the thickness of the powder. The lower surface of the connecting seat 507 contacts the surface of the abutment block 508. An electric telescopic rod 506 is fixedly connected to the upper side of the front surface of the moving seat 3. The telescopic end of the electric telescopic rod 506 is fixedly connected to the connecting seat 507. The outer surface of a set of scrapers 503 is fixedly connected to the abutment block 508. After the laser additive powder spreading process is completed, the connecting seat 507 is lowered by the drive of the electric telescopic rod 506, so that it contacts the abutment block 508, thereby causing the scraper 503 and the connecting frame 502 to return to their initial lowest height, ready for the next laser additive processing.

[0040] Working Principle: When this multi-material powder spreading device for laser additive manufacturing is working, it first achieves powder anti-caking and quantitative spreading through the anti-caking mechanism 4: the electric guide rail 1 drives two sets of guide seats 2 to move the moving seat 3, the motor 401 on the outside of the moving seat 3 starts, and its output shaft drives the quantitative spreading roller 402 to rotate, and at the same time drives the belt pulley b411 to rotate through the belt drive of the belt pulley c412; the belt pulley b411 drives the main drive shaft 406 to rotate, and the convex rod 413 on the outer arc surface of the main drive shaft 406 slides along the annular corrugated groove on the inner side of the support frame b409, so that the main drive shaft 406 rotates while moving backward. Lateral movement: The main drive shaft 406 drives the storage box 403 to move laterally synchronously. At the same time, the main drive shaft 406 drives the left pulley a405 through the groove, and drives the right pulley a405 to rotate through the belt. The two sets of pulleys a405 drive the corresponding stirring shaft 404 to rotate in the storage cavity, dispersing the powder and preventing agglomeration. When quantitatively spreading the material, the motor 401 drives the quantitative spreading roller 402 to rotate forward or backward, so that its cavity is aligned with the discharge port of the corresponding storage cavity of the storage box 403 to receive the material. Then, it rotates in the reverse direction to make the cavity face downward. With the help of the electric guide rail 1, the moving seat 3 moves to spread the powder evenly on the surface of the processing table.

[0041] Next, the powder spreading and leveling mechanism 5 is raised layer by layer to achieve dynamic height adjustment: the scrapers 503 fixed on both sides of the connecting frame 502 at the bottom of the moving seat 3 level the powder on the surface of the processing table as the moving seat 3 moves; the triangular blocks 505 on the inner side of the scraper 503 are inserted into the slots at the bottom of the moving seat 3 to fix the initial height of the scraper 503; when the moving seat 3 moves to the end of the electric guide rail 1, the connecting frame 502 contacts the multi-level contact blocks 501 at the four corners, and the triangular pressure of the multi-level contact blocks 501 drives the connecting frame 502 to move. As the scraper 503 rises, the triangular block 505 is compressed and the return spring 504 is disengaged from the slot. After rising, the return spring 504 pushes the triangular block 505 into the slot at a higher position, thus raising the height of the scraper 503 by one level to adapt to the thickness of each layer of powder. After processing, the electric telescopic rod 506 at the front end of the moving seat 3 drives the connecting seat 507 to descend. The connecting seat 507 contacts the abutment block 508 on the outside of the scraper 503, pushing the scraper 503 and the connecting frame 502 to descend and reset to the initial minimum height, waiting for the next operation.

[0042] In the description of this invention, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only to describe the invention and not to require the invention to be constructed or operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" in this invention should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0043] The above description represents the preferred mode of operation of the present invention. The specific operational modes are provided solely for a better understanding of the invention's concept. Those skilled in the art can make various improvements or equivalent substitutions based on the principles of this invention, and these improvements or equivalent substitutions are also considered to fall within the scope of protection of this invention.

Claims

1. A multi-material powder spreading device for laser additive manufacturing, comprising an electric guide rail (1), characterized in that, Two sets of guide seats (2) are slidably connected to the surface of the electric guide rail (1). A movable seat (3) is fixedly connected to the top of the two sets of guide seats (2). An anti-powdering mechanism (4) is provided at the top of the movable seat (3). A layer-by-layer lifting and scraping mechanism (5) is provided on the inner wall of the bottom of the movable seat (3). The anti-powdering mechanism (4) is used to vibrate and stir the two powders of laser additive manufacturing to prevent them from condensing. The layer-by-layer lifting and scraping mechanism (5) is used to scrape the powder layer by layer during the powder spreading process. The anti-caking mechanism (4) includes a motor (401), the output shaft of which is fixedly connected to a quantitative spreading roller (402). A storage box (403) is slidably connected to the top surface of the movable seat (3). The storage box (403) has two sets of storage cavities inside. The inner walls of the storage cavities on both sides of the storage box (403) are rotatably connected to stirring shafts (404). The rotation center shafts of the two sets of stirring shafts (404) are fixedly connected to pulleys a (405). The inner wall of the left pulley a (405) is rotatably connected to the main drive. Shaft (406), the surface of the main drive shaft (406) is slidably connected to a pulley b (411), the pulley b (411) is connected to a pulley c (412) via a belt drive; the end of the storage box (403) away from the main drive shaft (406) is fixedly connected to a secondary support shaft (407), the outer arc surface of the secondary support shaft (407) is slidably connected to a support frame a (408); the support frame a (408) is fixedly connected to the left side wall of the movable seat (3), the end of the movable seat (3) away from the support frame a (408) is fixedly connected to the support frame a (408). A support frame b (409) is fixedly connected to the main drive shaft (406). The inner sidewall of the support frame b (409) is provided with an annular corrugated groove. A protruding rod (413) is fixedly connected to the outer arc surface of the main drive shaft (406). The protruding rod (413) is slidably connected to the inner sidewall of the annular corrugated groove of the support frame b (409). A support rod (410) is fixedly connected to the inner sidewall of the support frame b (409). The surface of the pulley b (411) is provided with an annular groove. The end of the support rod (410) away from the support frame b (409) is slidably connected to the annular groove of the pulley b (411). The inner sidewall of the trough; the main drive shaft (406) passes through and is slidably connected to the inner sidewall of the support frame b (409); the rotation center axis of the pulley c (412) is fixedly connected to the rotation center axis of the quantitative spreading roller (402); the motor (401) is fixedly connected to the outer sidewall of the moving seat (3); the two sets of pulleys a (405) are connected by belt drive; the two sets of pulleys a (405) are rotatably connected to the right sidewall of the storage box (403); the main drive shaft (406) is rotatably connected to the outer sidewall of the storage box (403).

2. The multi-material powder spreading device for laser additive manufacturing according to claim 1, characterized in that, The layer-by-layer lifting scraping mechanism (5) includes multi-level contact blocks (501), and four sets of multi-level contact blocks (501) are provided. The four sets of multi-level contact blocks (501) are fixed at the four corners of the electric guide rail (1) in a mirror distribution. A connecting frame (502) is slidably connected through the inner wall of the bottom end of the moving seat (3). Scrapers (503) are fixedly connected to both sides of the connecting frame (502). Multiple sets of triangular blocks (505) are elastically connected to the inner side wall of the scraper (503) through a reset spring (504). An electric telescopic rod (506) is fixedly connected to the upper side of the front end surface of the moving seat (3). A connecting seat (507) is fixedly connected to the telescopic end of the electric telescopic rod (506). An abutment block (508) is fixedly connected to the outer surface of one set of scrapers (503).

3. The multi-material powder spreading device for laser additive manufacturing according to claim 2, characterized in that, One end of the reset spring (504) is fixedly connected to the inner side wall of the scraper (503), and the other end of the reset spring (504) is fixedly connected to the rear end of the triangular block (505).

4. A multi-material powder spreading device for laser additive manufacturing according to claim 2, characterized in that, The triangular block (505) is slidably connected to the inner side wall of the scraper (503). The inner side wall of the bottom end of the movable seat (3) is provided with a slot. The outer wall of the triangular block (505) is engaged with the inner wall of the slot. The outer side wall of the connecting frame (502) is in contact with the surface of the multi-level contact block (501). The lower surface of the connecting seat (507) is in contact with the surface of the abutment block (508).

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