Multi-material powder spreading device for laser additive manufacturing

Abstract

The invention relates to the field of laser additive manufacturing, and discloses a multi-material powder laying device for laser additive manufacturing, which comprises an electric guide rail, the surface of the electric 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 caking prevention mechanism. When a motor drives a quantitative spreading roller, the stirring shaft is driven to rotate in a storage cavity through belt transmission, and the storage box is driven to do reciprocating transverse movement through cooperation with a main transmission shaft under the action of a convex rod and an annular corrugated groove, so that the powder quality is improved; the double scattering effects of rotary stirring and transverse shaking are achieved, transverse movement and stirring of the material storage box are synchronously linked, it is ensured that powder is always in a dispersed state in the discharging process, the quantitative material spreading roller is in butt joint with cavities in the two sides of the material storage box through forward and reverse rotation switching, and precise material taking of the two materials is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser additive technology, in particular to a multi-material powder laying device for laser additive manufacturing. BACKGROUND

[0002] Laser additive manufacturing, also known as laser 3D printing, is one of the core branches of additive manufacturing. It uses laser as the energy source, and through the way of layer-by-layer melting-solidification accumulation, it directly converts metal, non-metal and other powder or wire raw materials into three-dimensional physical entity parts, which is essentially a direct manufacturing from digital model to physical entity, and is in sharp contrast to traditional subtractive manufacturing such as cutting and grinding.

[0003] In laser additive manufacturing, the multi-material powder laying device is the core equipment for realizing the forming of heterogeneous material composite components, and its performance directly affects the density, mechanical properties and forming efficiency of the components.

[0004] However, the metal or non-metal powder used in laser additive manufacturing (such as titanium alloy powder, resin powder) is prone to agglomeration due to environmental humidity or static electricity. The traditional storage structure lacks effective anti-caking measures. After the powder accumulates and clogs in the storage box, it will block the discharge port or cause uneven powder laying. Although some devices add a stirring mechanism, the stirring mechanism is mostly single-direction rotating, which cannot completely break up the condensed particles, and the stirring is not synchronized with the discharging, which still has the risk of local clogging entering the processing table, resulting in defects such as pores and inclusions in the formed components. SUMMARY

[0005] The purpose of the present application is to solve the problems raised in the background art, and a multi-material powder laying device for laser additive manufacturing is proposed. The present application improves the quality of powder through the coordinated anti-caking mechanism of the stirring shaft and the transverse movement of the storage box: while the motor drives the quantitative laying roller, the stirring shaft is driven to rotate in the storage cavity through the belt transmission, and the main transmission shaft drives the storage box to move reciprocally and transversely through the action of the convex rod and the annular corrugated groove, forming a double-dispersing effect of rotary stirring and transverse shaking. The transverse movement of the storage box is synchronized with the stirring, ensuring that the powder is always in a dispersed state during discharging. The quantitative laying roller is connected to the two cavities on both sides of the storage box through forward and reverse rotation switching, realizing precise material taking of two kinds of materials, and avoiding blockage and pollution caused by manual intervention.

[0006] The technical solution adopted by the present application to solve its technical problems is: A multi-material powder laying device for laser additive manufacturing, comprising 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, the top end of the moving seat is provided with an anti-powdering mechanism, and the inner wall of the bottom end of the moving seat is provided with a layer-by-layer lifting and scraping mechanism; the anti-powdering mechanism is used for vibrating and stirring two kinds of powder materials of laser additive manufacturing to avoid condensation; and the layer-by-layer lifting and scraping mechanism is used for layer-by-layer scraping of the powder during powder laying.

[0007] As preferred, the anti-powdering mechanism comprises a motor, the output shaft of the motor is fixedly connected with a quantitative powder laying roller, the top surface of the moving seat is slidably connected with a storage box, two groups of storage cavities are formed in the inside of the storage box, stirring shafts are rotatably connected to the inner walls of the two groups of storage cavities on the two sides of the storage box, the rotation center shafts of the two groups of stirring shafts are fixedly connected with belt pulleys a, the inner wall of the left belt pulley a penetrates and is rotatably connected with a main transmission shaft, the surface of the main transmission shaft penetrates and is slidably connected with a belt pulley b, and the belt pulley b is connected with a belt pulley c through a belt drive.

[0008] As preferred, the end of the storage box away from the main transmission shaft is fixedly connected with a secondary support shaft, and the outer cam surface of the secondary support shaft penetrates and is slidably connected with a support frame a.

[0009] As preferred, the support frame a is fixedly connected to the left side wall of the moving seat, the end of the moving seat away from the support frame a is fixedly connected with a support frame b, the inner side wall of the support frame b is provided with an annular corrugated groove, the outer cam surface of the main transmission shaft is fixedly connected with a protruding rod, and the protruding rod is slidably connected to the inner side wall of the annular corrugated groove of the support frame b.

[0010] As preferred, the inner side wall of the support frame b is fixedly connected with a support rod, the surface of the belt pulley b is provided with an annular groove, and the end of the support rod away from the support frame b is slidably connected to the inner side wall of the annular groove of the belt pulley b.

[0011] As preferred, the main transmission shaft penetrates and is slidably connected to the inner side wall of the support frame b, and the rotation center shaft of the belt pulley c is fixedly connected with the rotation center shaft of the quantitative powder laying roller.

[0012] As preferred, the motor is fixedly connected to the outer side wall of the moving seat, the two groups of belt pulleys a are connected through a belt drive, the two groups of belt pulleys a are rotatably connected to the right side wall of the storage box, and the main transmission shaft is rotatably connected to the outer side wall of the storage box.

[0013] As preferred, the layer-by-layer lifting scraping mechanism comprises a plurality of contact blocks, four groups of the plurality of contact blocks are fixed at four corners of the electric guide rail in a mirror image distribution, a connecting frame is connected through and slidably connected to the inner wall of the bottom end of the moving seat, the two sides of the connecting frame are fixedly connected with scrapers, the inner side wall of the scraper is elastically connected with a plurality of triangular blocks through a return spring, the upper side of the front end surface of the moving seat is fixedly connected with an electric telescopic rod, the telescopic end of the electric telescopic rod is fixedly connected with a connecting seat, and the outer side surface of a group of scrapers is fixedly connected with an abutting block.

[0014] As preferred, one end of the return spring is fixedly connected to the inner side wall of the scraper, and the other end of the return spring is fixedly connected to the rear end of the triangular block.

[0015] As preferred, the triangular block is slidably connected to the inner side wall of the scraper, the inner side wall of the bottom end of the moving seat is provided with a clamping groove, the outer wall of the triangular block is clamped with the inner wall of the clamping groove, the outer side wall of the connecting frame is in contact with the surface of the plurality of contact blocks, and the lower surface of the connecting seat is in contact with the surface of the abutting block.

[0016] The present application has the following advantages: 1. The present application improves the quality of powder by the cooperation of the stirring shaft and the transverse movement of the storage box: while the motor drives the quantitative laying roller, the stirring shaft is driven to rotate in the storage cavity through the belt transmission, and the reciprocating transverse movement of the storage box is driven through the action of the cam and the annular corrugated groove, forming the double scattering effect of rotation and transverse shaking. The transverse movement of the storage box is synchronized with the stirring, ensuring that the powder is always in a dispersed state during the discharging process. The quantitative laying roller realizes precise material taking by being butt-jointed with the cavities on both sides of the storage box through forward and reverse switching, avoiding blockage and pollution caused by manual intervention.

[0017] 2. The present application realizes no-stop material switching relying on the quantitative laying roller and linkage transmission: the motor drives the quantitative laying roller to rotate forward or reversely, so that the cavity of the quantitative laying roller is aligned with the discharging port of the corresponding storage cavity. The two groups of independent cavities of the storage box realize physical isolation of two materials, and cooperate with the precise material taking of the quantitative laying roller. The transmission system links the quantitative laying and anti-powdering actions, without the need for an additional power source. The equipment structure is compact, and is suitable for the continuous production demand of multi-material gradient components.

[0018] 3. The present application realizes dynamic adjustment of the height of the scraper through multi-stage contact blocks and elastic clamping, when the moving seat moves back and forth to lay powder, the two side scrapers synchronously scrape the powder in both directions, avoiding secondary accumulation caused by single pass scraping, when moving to the end of the electric guide rail, the connecting frame contacts the multi-stage contact blocks, pushing the scraper to rise, the triangular blocks are automatically clamped into higher clamping grooves through the reset spring, realizing accurate lifting of the height of the scraper after laying powder on each layer, after processing is completed, the electric telescopic rod drives the scraper to reset with one key, convenient operation, effectively guaranteeing the dimensional accuracy and interlayer bonding strength of the multi-layer component.

[0019] 4. The present application sets up an anti-powdering mechanism for vibrating and stirring the two kinds of powder for laser additive, avoiding condensation, sets up a layer-by-layer lifting and scraping mechanism for scraping layer by layer during powder laying, improving the powder catching effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the overall perspective view of the present application; Figure 2 is a schematic view of the electric guide rail and the guide seat in a separated state of the present application; Figure 3 is a partial sectional view of the storage box and the moving seat of the present application; Figure 4 is a schematic view of the storage box and the moving seat in a separated state of the present application; Figure 5 is a partial sectional view of the support frame b of the present application; Figure 6 is a partial sectional view of the scraper of the present application.

[0021] Among them: 1, electric guide rail; 2, guide seat; 3, moving seat; 4, anti-powdering mechanism; 401, motor; 402, quantitative laying roller; 403, storage box; 404, stirring shaft; 405, pulley a; 406, main transmission shaft; 407, auxiliary support shaft; 408, support frame a; 409, support frame b; 410, support rod; 411, pulley b; 412, pulley c; 413, protruding rod; 5, layer-by-layer lifting and scraping mechanism; 501, multi-stage contact block; 502, connecting frame; 503, scraper; 504, reset spring; 505, triangular block; 506, electric telescopic rod; 507, connecting seat; 508, abutting block. DETAILED DESCRIPTION

[0022] 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.

[0023] Example: 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.

[0024] 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.

[0025] The top end surface of the moving seat 3 is slidably connected with a storage box 403, the width of the bottom end discharge port of the storage box 403 is matched with the empty groove of the top end of the moving seat 3, the length is longer than the empty groove, and the storage box 403 can only move laterally on the upper surface of the moving seat 3, one end of the storage box 403 away from the main transmission shaft 406 is fixedly connected with a vice supporting shaft 407, the outer arc surface of the vice supporting shaft 407 penetrates and is slidably connected with a supporting frame a 408, the supporting frame a 408 is fixedly connected to the left side wall of the moving seat 3, by being provided with the vice supporting shaft 407 and the supporting frame a 408, the movement of the storage box 403 can be guided, so that it can only move laterally, one end of the moving seat 3 away from the supporting frame a 408 is fixedly connected with a supporting frame b 409, the inner side wall of the supporting frame b 409 is fixedly connected with a supporting rod 410, the surface of a belt pulley b 411 is provided with an annular groove, one end of the supporting rod 410 away from the supporting frame b 409 is slidably connected to the inner side wall of the annular groove of the belt pulley b 411, the supporting rod 410 serves to rotationally support the position of the belt pulley b 411, so that it can only rotate circumferentially on the surface of the main transmission shaft 406, and the main transmission shaft 406 can also move forward and backward at the center of the belt pulley b 411, and the center of the belt pulley b 411 is provided with an inner groove matched with the outer arc surface of the main transmission shaft 406, so that the belt pulley b 411 will drive the main transmission shaft 406 to rotate synchronously when rotating.

[0026] The inner side wall of the support frame b409 is provided with an annular corrugated groove, the outer arc surface of the main transmission shaft 406 is fixedly connected with a convex rod 413, the convex rod 413 is slidingly connected with the inner side wall of the annular corrugated groove of the support frame b409, when the main transmission shaft 406 is driven to rotate by the belt pulley b411, the main transmission shaft 406 is driven to rotate synchronously, the main transmission shaft 406 drives the convex rod 413 to move, and the convex rod 413 also slides on the inner wall of the annular corrugated groove of the support frame b409, so that the convex rod 413 drives the main transmission shaft 406 to move reciprocatingly and transversely, thereby driving the storage box 403 to move transversely on the upper surface of the moving seat 3, so as to avoid the accumulation of wet powder in the moving seat 3. The inner wall of the two groups of storage cavities on the two sides of the storage box 403 is rotatably connected with an agitator shaft 404, the rotation center shaft of the two groups of agitator shafts 404 is fixedly connected with a belt pulley a405, when the two groups of belt pulleys a405 rotate, the agitator shaft 404 rotates in the inner side of the storage cavity of the storage box 403, so as to scatter the powder and avoid wet condensation, which affects the final laser additive manufacturing. The inner wall of the left belt pulley a405 is rotatably connected with the main transmission shaft 406, and the inner side of the left belt pulley a405 is provided with a convex groove matched with the outer arc surface of the main transmission shaft 406, so that when the main transmission shaft 406 rotates with the belt pulley b411, the belt pulley a405 rotates synchronously. The two groups of belt pulleys a405 are drivingly connected through a belt, and the two groups of belt pulleys a405 are rotatably connected with the right side wall of the storage box 403. The main transmission shaft 406 is rotatably connected with the outer side wall of the storage box 403, and the main transmission shaft 406 can only rotate circumferentially on the side wall of the storage box 403. When the main transmission shaft 406 moves, the storage box 403 moves synchronously. The main transmission shaft 406 penetrates and slidingly connects with the inner side wall of the support frame b409. The support frame b409 provides rotational support for the main transmission shaft 406. The surface of the main transmission shaft 406 penetrates and slidingly connects with the belt pulley b411. The belt pulley b411 is drivingly connected with the belt pulley c412 through a belt. The rotation center shaft of the belt pulley c412 is fixedly connected with the rotation center shaft of the quantitative material laying roller 402. When the motor 401 drives the quantitative material laying roller 402 to rotate, the two groups of powder are switched and quantitatively laid, and the belt pulley c412 also rotates synchronously, thereby realizing linkage transmission.

[0027] As Figure 6As shown, the layer-by-layer lifting scraping mechanism 5 comprises a plurality of contact blocks 501, which are provided with four groups and are fixed at the four corners of the electric guide rail 1 in a mirror image distribution, and are composed of a group of rod bodies and four groups of triangles, and the gap between each triangle is matched with the rear end of the connecting frame 502, and the thickness of the four groups of triangles is matched with the triangular block 505. The inner wall of the bottom end of the moving seat 3 penetrates and is slidingly connected with the connecting frame 502. The inner wall of the bottom end of the moving seat 3 is provided with a guide groove, so that the connecting frame 502 can only move up and down linearly in the inner wall of the guide groove at the bottom end of the moving seat 3. 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. The reset spring 504 is used to reset the position of the triangular block 505 after being extruded by the inner side clamping groove of the moving seat 3. The two sides of the connecting frame 502 are fixedly connected with the scraper 503. By arranging the scraper 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 wipe the powder on the surface of the processing table, the powder laid out can be scraped flat whether the powder is wiped left or right.

[0028] The inner side wall of the scraper 503 is elastically connected with a plurality of triangular blocks 505 through the return spring 504. The triangular blocks 505 are slidingly connected to the inner side wall of the scraper 503. The inner side wall of the bottom end of the moving seat 3 is provided with a clamping groove. The outer wall of the triangular block 505 is clamped with the inner wall of the clamping groove. The shape of the triangular block 505 is a laterally placed triangle. The clamping between the two can fix the scraper 503 at a plurality of positions during movement of the connecting frame 502. Without the influence of external force, the position of the scraper 503 will not change. The outer side wall of the connecting frame 502 is in contact with the surface of the multi-stage contact block 501. When the moving seat 3 drives the connecting frame 502 to move, it moves to the left to spread the powder once or moves to the right to spread the powder. When it moves to the end of the electric guide rail 1, it will press the triangular block 502 of the connecting frame 502 through the multi-stage contact block 501 to drive the scraper 503 to rise, so as to fix the rising position of the scraper 503 through the triangular block 505, so that the initial height of the scraper 503 can be raised by one level each time the powder is spread, so as to dynamically adjust the thickness of the spread powder. The lower surface of the connecting seat 507 is in contact with the surface of the abutting block 508. The upper side of the front end surface of the moving seat 3 is fixedly connected with the electric telescopic rod 506. The telescopic end of the electric telescopic rod 506 is fixedly connected with the connecting seat 507. The outer side surface of a group of scrapers 503 is fixedly connected with the abutting block 508. After the laser additive powder spreading processing is completed, the connecting seat 507 is driven by the electric telescopic rod 506 to be lowered to be in contact with the abutting block 508, so as to drive the scraper 503 and the connecting frame 502 to return to the initial lowest height, thereby waiting for the next laser additive processing.

[0029] Working principle: when the multi-material powder spreading device for laser additive manufacturing works, firstly, the anti-powdering mechanism 4 realizes powder anti-coagulation and quantitative spreading: the electric guide rail 1 drives the two groups of guide seats 2 to drive the moving seat 3 to move. The motor 401 on the outer side of the moving seat 3 is started. The output shaft drives the quantitative spreading roller 402 to rotate. At the same time, the belt pulley c412 drives the belt pulley b411 to rotate through the belt transmission. The belt pulley b411 drives the main transmission shaft 406 to rotate. The convex rod 413 on the outer arc surface of the main transmission shaft 406 slides along the inner side of the annular corrugated groove of the support frame b409, so that the main transmission shaft 406 rotates while making reciprocating transverse movement. The main transmission shaft 406 drives the storage box 403 to move synchronously. At the same time, the main transmission shaft 406 drives the left side belt pulley a405 through the convex groove transmission, and drives the right side belt pulley a405 to rotate through the belt. The two groups of belt pulleys a405 drive the corresponding stirring shafts 404 to rotate in the storage cavity to scatter the powder and prevent coagulation. During quantitative spreading, the motor 401 drives the quantitative spreading roller 402 to rotate forward or reversely, so that the cavity is aligned with the discharge port of the corresponding storage cavity of the storage box 403 to receive the material. Then, the cavity is reversed to face downward, and the moving seat 3 is driven by the electric guide rail 1 to move, so as to uniformly spread the powder on the surface of the processing table.

[0030] The powder paving and scraping are achieved by lifting the scraping mechanism 5 layer by layer: the scraping plate 503 fixed on both sides of the connecting frame 502 at the bottom end of the moving seat 3 is moved to scrape the powder on the surface of the processing table; the triangular block 505 on the inner side of the scraping plate 503 is clamped into the clamping groove at the bottom end of the moving seat 3 to fix the initial height of the scraping plate 503; when the moving seat 3 moves to the end of the electric guide rail 1, the connecting frame 502 is in contact with the four-corner multi-stage contact block 501, the triangular extrusion of the multi-stage contact block 501 drives the scraping plate 503 to rise, the triangular block 505 is extruded and compressed to reset the spring 504 to disengage the clamping groove, and after rising, the reset spring 504 pushes the triangular block 505 to clamp into the clamping groove at a higher position, so that the height of the scraping plate 503 is increased by one level to adapt to the thickness of the powder paving layer by layer; after the processing is completed, 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 is in contact with the abutting block 508 on the outer side of the scraping plate 503, and the scraping plate 503 and the connecting frame 502 are pushed down to reset to the initial lowest height, waiting for the next operation.

[0031] In the description of the present application, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application and do not require the present application to be constructed or operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In the present application, "connected" and "connected" should be understood broadly, for example, it can be connected, or it can be detachable connection; it can be direct connection, or indirect connection through intermediate components, and the specific meaning of the above terms can be understood according to the specific circumstances for those skilled in the art.

[0032] The above is the preferred operation mode of the present application, and the description of the specific operation mode is only for better understanding of the idea of the present application. For ordinary skilled in the art, according to the principle of the present application, several improvements or equivalent replacements can also be made, which are also considered to fall within the protection scope of the present application.

Claims

1. A multi-material powder spreading device for laser additive manufacturing comprising an electrically driven guide rail (1), characterized in that The surface of the electric guide rail (1) is slidably connected with two groups of guide seats (2), the top ends of the two groups of guide seats (2) are fixedly connected with a moving seat (3), the top end of the moving seat (3) is provided with a powder agglomeration prevention mechanism (4), and the inner wall of the bottom end of the moving seat (3) is provided with a layer-by-layer lifting and scraping mechanism (5); the powder agglomeration prevention mechanism (4) is used for vibrating and stirring two kinds of powder materials of laser additive, so as to avoid agglomeration; and the layer-by-layer lifting and scraping mechanism (5) is used for scraping the powder layer by layer during powder laying.

2. A multi-material powder spreading device for laser additive manufacturing according to claim 1, characterized in that The powder agglomeration prevention mechanism (4) comprises a motor (401), the output shaft of the motor (401) is fixedly connected with a quantitative laying roller (402), the top surface of the moving seat (3) is slidably connected with a storage box (403), the inside of the storage box (403) is provided with two groups of storage cavities, the inner walls of the two groups of storage cavities are rotatably connected with stirring shafts (404), the rotation center shafts of the two groups of stirring shafts (404) are fixedly connected with belt pulleys a (405), the inner wall of the left belt pulley a (405) penetrates and is rotatably connected with a main transmission shaft (406), the surface of the main transmission shaft (406) penetrates and is slidably connected with a belt pulley b (411), and the belt pulley b (411) is driven by a belt to be connected with a belt pulley c (412).

3. A multi-material powder spreading device for laser additive manufacturing according to claim 2, wherein, One end of the storage box (403) away from the main transmission shaft (406) is fixedly connected with a vice supporting shaft (407), and the outer arc surface of the vice supporting shaft (407) penetrates and is slidably connected with a supporting frame a (408).

4. A multi-material powder spreading device for laser additive manufacturing according to claim 3, wherein, The supporting frame a (408) is fixedly connected to the left side wall of the moving seat (3), one end of the moving seat (3) away from the supporting frame a (408) is fixedly connected with a supporting frame b (409), the inner side wall of the supporting frame b (409) is provided with an annular corrugated groove, the outer arc surface of the main transmission shaft (406) is fixedly connected with a convex rod (413), and the convex rod (413) is slidably connected to the inner side wall of the annular corrugated groove of the supporting frame b (409).

5. A multi-material powder spreading device for laser additive manufacturing according to claim 4, wherein, The inner side wall of the supporting frame b (409) is fixedly connected with a supporting rod (410), the surface of the belt pulley b (411) is provided with an annular groove, and one end of the supporting rod (410) away from the supporting frame b (409) is slidably connected to the inner side wall of the annular groove of the belt pulley b (411).

6. A multi-material powder spreading device for laser additive manufacturing according to claim 2, wherein, The main transmission shaft (406) penetrates and is slidably connected to the inner side wall of the supporting frame b (409), and the rotation center shaft of the belt pulley c (412) is fixedly connected with the rotation center shaft of the quantitative laying roller (402).

7. A multi-material powder spreading device for laser additive manufacturing according to claim 2, wherein, The motor (401) is fixedly connected to the outer side wall of the moving seat (3), the two groups of belt pulleys a (405) are driven by a belt, the two groups of belt pulleys a (405) are rotatably connected to the right side wall of the storage box (403), and the main transmission shaft (406) is rotatably connected to the outer side wall of the storage box (403).

8. The multi-material powder spreading device for laser additive manufacturing of claim 1, wherein, The layer-by-layer lifting scraping mechanism (5) comprises multistage contact blocks (501), which are provided with four groups and are fixed at four corners of the electric guide rail (1) in a mirror image distribution, a connecting frame (502) is connected through and slidably connected to the inner wall of the bottom end of the moving seat (3), the two sides of the connecting frame (502) are fixedly connected with scrapers (503), the inner side wall of the scraper (503) is elastically connected with a plurality of triangular blocks (505) through a reset spring (504), the upper side of the front end surface of the moving seat (3) is fixedly connected with an electric telescopic rod (506), the telescopic end of the electric telescopic rod (506) is fixedly connected with a connecting seat (507), and the outer side surface of a group of scrapers (503) is fixedly connected with an abutting block (508).

9. A multi-material powder spreading device for laser additive manufacturing according to claim 8, 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).

10. A multi-material powder spreading device for laser additive manufacturing according to claim 8, wherein, 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 moving seat (3) is provided with a clamping groove, the outer wall of the triangular block (505) is clamped with the inner wall of the clamping groove, the outer side wall of the connecting frame (502) is in contact with the surface of the multistage contact block (501), and the lower surface of the connecting seat (507) is in contact with the surface of the abutting block (508).

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