A multi-material powder mixing device and method

Abstract

The present invention discloses a multi-material powder mixing device, including a frame and a powder spreading mechanism arranged on the frame and capable of horizontal movement, the powder spreading mechanism including a powder spreading box which can be arranged on the frame for horizontal movement and a plurality of powder distribution bins arranged in the powder spreading box, the frame is provided with a translation driving assembly for driving the powder spreading box to move horizontally, the bottom of the powder spreading box is provided with an inclined flow guide surface, the powder spreading box is provided with a powder drop opening at the bottom end of the flow guide surface, the powder spreading box is provided with a powder mixing channel below the powder drop opening, each powder distribution bin is located above the flow guide surface and arranged at intervals along the inclined direction of the flow guide surface, the closer the powder distribution bin is to the powder drop opening, the greater the vertical distance relative to the flow guide surface, and the bottom of the powder distribution bin is provided with a powder discharge valve body mechanism. A multi-material powder mixing method is also disclosed, including the steps of: powder discharge; powder mixing and powder spreading. The multi-material powder mixing device and method can improve production efficiency, uniformity of powder mixing and powder spreading, and product quality, and can reduce processing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of laser additive manufacturing, and in particular to a multi-material powder mixing device and method. Background Art

[0002] Proton exchange membrane fuel cells are clean, efficient energy conversion devices that convert hydrogen into electrical energy, and bipolar plates are multifunctional core components. Current research has found that some plates with bionic or three-dimensional structured flow channels have shown better performance. However, due to the complexity of the structure and the difficulty in preparation, such bionic structure plates have not yet been applied. Plates are generally formed by powder forming, and the powder forming process generally uses laser additive manufacturing technology to stack powder layers to form a solid body, and then the solid body is stamped. Laser additive manufacturing technology is to spread powder on a powder bed, and then the laser beam melts or sinters the metal powder on the powder bed according to the trajectory path given by the three-dimensional model, and stacks layers to form a solid body. Laser additive manufacturing technology is characterized by not being restricted by part structure, and is one of the key technologies to solve the problem of difficult preparation of complex structure plates such as bionics and three-dimensional.

[0003] The powder bed has a high requirement for uniform powder spreading, which is generally carried out using a powder spreading mechanism. The existing powder spreading mechanism has the following defects:

[0004] (1) The powder mixing method is mechanical blending. Due to the different densities of the materials, the powder mixing is uneven, and it is impossible to achieve online mixing of multiple powders, resulting in low processing efficiency and poor quality.

[0005] (2) A powder distributor is used to repeatedly load powders, and multiple powders cannot be processed simultaneously to achieve the preparation of gradient functional plates;

[0006] (3) When processing fine powders, the commonly used roller-type powder spreading plate will cause powder agglomeration due to electrostatic adsorption, van der Waals force, etc., and the roller is easily stained with powder lumps, resulting in uneven powder spreading;

[0007] (4) The commonly used scraper-type powder spreading plate is easy to scrape marks on the powder layer during use, and when the powder particle size is too large, powder rebound will occur, contaminating the laser lens;

[0008] (5) A variety of different powders need to pass through the same powder distributor before they fall onto the powder bed. Therefore, there may be some residue in the powder distributor, which will contaminate the subsequent powders and cause an imbalance in the mixed powder ratio. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-material powder mixing device and method that can improve production efficiency, powder mixing and powder spreading uniformity and product quality and can reduce processing costs.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0011] A multi-material powder mixing device comprises a frame and a powder spreading mechanism which is arranged on the frame and can move horizontally, the powder spreading mechanism comprises a powder spreading box which can be translated on the frame and a plurality of powder equalizing bins arranged in the powder spreading box, the frame is provided with a translation driving assembly for driving the powder spreading box to move horizontally, the bottom of the powder spreading box is provided with an inclined guide surface, the powder spreading box is provided with a powder dropping port at the bottom end of the guide surface, the powder spreading box is provided with a powder mixing channel below the powder dropping port, each of the powder equalizing bins is located above the guide surface and is arranged at intervals along the inclined direction of the guide surface, the closer the powder equalizing bin is to the powder dropping port, the greater the vertical distance relative to the guide surface, and the bottom of the powder equalizing bin is provided with a powder discharge valve body mechanism.

[0012] As a further improvement of the above technical solution:

[0013] The powder mixing channel has a fixed side wall fixed on the powder spreading box on one side close to the flow guide surface, and a movable side wall on the other side. The frame is provided with a spacing adjustment component for adjusting the spacing between the fixed side wall and the movable side wall.

[0014] The translation drive assembly includes two parallel screw rods and screw sleeves respectively arranged on both sides of the powder spreading box. The screw rods are rotatably arranged on the frame, and the screw sleeves are respectively sleeved on each screw rod. The frame is provided with a first rotation drive assembly for driving each screw rod to rotate synchronously.

[0015] The interval adjustment component includes two parallel screws and threaded sleeves respectively arranged on both sides of the movable side wall. The screws are rotatably arranged on the frame, and the threaded sleeves are respectively sleeved on each screw. The frame is provided with a second rotation drive component for driving each screw to rotate synchronously.

[0016] The powder spreading box is provided with a vibrator.

[0017] The powder discharge valve body mechanism comprises a powder discharge lever and a motor for driving the powder discharge lever to rotate, and the powder discharge lever is rotatably arranged at the opening at the bottom of the powder distribution bin.

[0018] The powder distribution bin is inserted into the powder spreading box from top to bottom, and the motor is arranged on the outer wall of the powder spreading box and is detachably connected to the powder placing lever.

[0019] Insertion strips are arranged on both sides of the powder distribution bin, and sockets are arranged at positions of the powder spreading box corresponding to the insertion strips, and the insertion strips are inserted into the corresponding sockets.

[0020] The powder discharge valve body mechanism comprises a valve plate arranged at the bottom opening of the powder distribution bin and an opening and closing driving component for driving the valve plate to open and close.

[0021] A multi-material powder mixing method is performed using the multi-material powder mixing device described above, comprising the following steps:

[0022] S1. Powder placing: different powders are placed into each powder mixing bin;

[0023] S2. Powder mixing and powder spreading: the powder discharge valve mechanisms are opened in sequence at set intervals in the order of arrangement along the downward inclination of the guide surface, so that the powder falling from the first valve opened and the powder falling from the later valve opened collide and mix on the guide surface directly below the powder equalizing bin of the later valve opened; the translation drive component drives the powder spreading box to move horizontally at a set speed to spread the mixed powder onto the powder bed below.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] The multi-material powder mixing device of the present invention realizes online mixing of multiple powders through the falling effect of the self-weight of each powder, shortens the processing time, and improves production efficiency; multiple powder distribution bins are used to place different powders respectively, and multiple powders can be processed at the same time to realize the preparation of gradient functional plates and avoid imbalance in the mixing ratio of powders; the powder dropping time and amount are controlled by the powder discharge valve body mechanism, and each powder converges and collides on the guide surface, and then repeatedly collides and mixes in the powder mixing channel, and the mixing uniformity is high; the powder is spread by the horizontal movement of the powder spreading mechanism, and there is no need to use a roller-type powder spreading plate or a scraper-type powder spreading plate, and the powder spreading uniformity is good. The multi-material powder mixing device has a reasonable structural design, can improve production efficiency, powder mixing and spreading uniformity and product quality, and can reduce processing costs.

[0026] The multi-material powder mixing method of the present invention realizes online mixing of multiple powders through the falling effect of the self-weight of each powder, shortens the processing time, and improves production efficiency; multiple powder distribution bins are used to place different powders respectively, and multiple powders can be processed at the same time to realize the preparation of gradient functional plates and avoid imbalance in the mixing powder ratio; the powder dropping time and amount are controlled by the powder discharge valve body mechanism, and each powder converges and collides on the guide surface, and then repeatedly collides and mixes in the powder mixing channel, and the mixing uniformity is high; the powder is spread by the horizontal movement of the powder spreading mechanism, and there is no need to use a roller-type powder spreading plate or a scraper-type powder spreading plate, and the powder spreading uniformity is good. The present multi-material powder mixing method can improve production efficiency, powder mixing and powder spreading uniformity and product quality, and can reduce processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the multi-material powder mixing device of the present invention.

[0028] Figure 2 yes Figure 1 Schematic diagram of the main structure.

[0029] Figure 3 yes Figure 1Schematic diagram of the top view structure.

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0031] Figure 5 It is a schematic diagram of the main cross-sectional structure of the multi-material powder mixing device of the present invention.

[0032] Figure 6 It is a schematic structural diagram of a powder mixing bin of a multi-material powder mixing device of the present invention.

[0033] Figure 7 It is a powder mixing principle diagram of a powder spreading box of a multi-material powder mixing device of the present invention.

[0034] Figure 8 It is a schematic diagram of the main structure of the second embodiment of the multi-material powder mixing device of the present invention.

[0035] Fig. 9 It is a schematic diagram of the main cross-sectional structure of the second embodiment of the multi-material powder mixing device of the present invention.

[0036] The symbols in the figure represent:

[0037] 1. Frame; 6. Powder spreading mechanism; 61. Powder spreading box; 611. Guide surface; 612. Powder dropping port; 613. Powder mixing channel; 614. Fixed side wall; 615. Movable side wall; 616. Interval adjustment assembly; 617. Screw; 618. Threaded sleeve; 619. Second rotary drive assembly; 62. Powder equalizing bin; 621. Insert; 63. Powder discharge valve body mechanism; 631. Powder discharge lever; 632. Motor; 633. Valve plate; 634. Opening and closing drive assembly; 64. Screw; 65. Threaded sleeve; 66. First rotary drive assembly; 7. Vibrator; 8. Socket. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] As shown in the present disclosure and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0040] Embodiment 1:

[0041] Figures 1 to 7 An embodiment of a multi-material powder mixing device of the present invention is shown. The multi-material powder mixing device includes a frame 1 and a powder spreading mechanism 6 which is arranged on the frame 1 and can move horizontally. The powder spreading mechanism 6 includes a powder spreading box 61 which can be translated on the frame 1 and a plurality of powder equalizing bins 62 arranged in the powder spreading box 61. A translation driving component for driving the powder spreading box 61 to move horizontally is provided on the frame 1. An inclined guide surface 611 is provided at the bottom of the powder spreading box 61. A powder dropping port 612 is provided at the bottom end of the guide surface 611 of the powder spreading box 61. A powder mixing channel 613 is provided below the powder dropping port 612 of the powder spreading box 61. Each powder equalizing bin 62 is located above the guide surface 611 and is arranged at intervals along the inclined direction of the guide surface 611. The closer the powder equalizing bin 62 is to the powder dropping port 612, the greater the vertical distance of the powder equalizing bin 62 relative to the guide surface 611. A powder discharge valve body mechanism 63 is provided at the bottom of the powder equalizing bin 62. The vertical distances of the powder distribution bins 62 relative to the flow guide surface 611 are different. The closer the powder distribution bin 62 is to the powder drop outlet 612 , the greater the vertical distance of the powder distribution bin 62 relative to the flow guide surface 611 .

[0042] The processing process of the multi-material powder mixing device is as follows: the first step is to put different powders into each powder equalizing bin 62; the second step is to open each powder discharge valve body mechanism 63 in sequence at set intervals in the order of arrangement along the downward inclination direction of the guide surface 611, so that the powder that falls from the first valve opening and the powder that falls from the later valve opening collide and mix on the guide surface 611 directly below the powder equalizing bin 62 of the later valve opening; the translation drive component drives the powder spreading box 61 to move horizontally at a set speed to spread the mixed powder onto the powder bed below.

[0043] Since the vertical distances of the powder-distributing bins 62 relative to the guide surface 611 are different, when the powder falls from the powder-distributing bin 62 onto the guide surface 611, the speed of the powder falling onto the guide surface 611 is different. The powder that first falls onto the guide surface 611 slides up and down on the guide surface 611, and the powder that falls later falls onto the powder that slides up and down on the guide surface 611, so as to achieve inclined powder mixing. The falling powder collides with the powder already existing on the guide surface 611, and the collision effect is different at different speeds. The powder undergoes a powder mixing process on the guide surface 611 and falls at the same time. When the mixed powder enters the powder mixing channel 613 after being preliminarily mixed on the guide surface 611, the powder cross-collides and rebounds between the opposite side walls of the powder mixing channel 613, and falls at the same time. Due to the different densities of the powders, the speed of the collision and rebound with the side walls and the falling speed are different, and then the powder is mixed again during the falling process in the powder mixing channel 613. By mixing the powders on the inclined surface and in the channel, the powders can be fully mixed to improve uniformity and efficiency.

[0044] This multi-material powder mixing device can achieve online mixing of multiple powders through the falling effect of the self-weight of each powder, shorten the processing time and improve production efficiency; multiple powder distribution bins 62 are used to place different powders respectively, and multiple powders can be processed at the same time to achieve gradient functional plate preparation and avoid imbalance in the proportion of mixed powders; the powder dropping time and amount are controlled by the powder discharge valve body mechanism 63, and each powder converges and collides on the guide surface 611, and then repeatedly collides and mixes in the powder mixing channel 613, with high mixing uniformity; the powder is spread by the horizontal movement of the powder spreading mechanism 6, and there is no need to use a roller-type powder spreading plate or a scraper-type powder spreading plate, and the powder spreading uniformity is good. The multi-material powder mixing device has a reasonable structural design, can improve production efficiency, powder mixing and spreading uniformity and product quality, and can reduce processing costs.

[0045] In this embodiment, the powder mixing channel 613 has a fixed side wall 614 fixed to the powder spreading box 61 on one side close to the flow guide surface 611, and a movable side wall 615 on the other side. The frame 1 is provided with a spacing adjustment component 616 for adjusting the spacing between the fixed side wall 614 and the movable side wall 615. The spacing adjustment component 616 is used to adjust the spacing between the fixed side wall 614 and the movable side wall 615 to meet the mixing requirements of different powders. Figure 5 As shown, the guide surface 611 is connected to the inner side surface of the fixed side wall 614, the powder drop port 612 is arranged on the side wall of the powder spreading box 61, the fixed side wall 614 and the movable side wall 615 are vertically parallel, and the movable side wall 615 is located on the outer side of the powder drop port 612 for direct impact of the powder sliding down along the guide surface 611.

[0046] In this embodiment, Figure 1 As shown, the translation drive assembly includes two parallel screw rods 64 and screw sleeves 65 respectively arranged on both sides of the powder spreading box 61, the screw rods 64 are rotatably arranged on the frame 1, the screw sleeves 65 are respectively sleeved on each screw rod 64, and the frame 1 is provided with a first rotation drive assembly 66 for driving each screw rod 64 to rotate synchronously. The screw sleeve 65 is fixedly connected to the powder spreading box 61, and the first rotation drive assembly 66 drives each screw rod 64 to rotate synchronously, driving the screw sleeve 65 and the powder spreading box 61 to move horizontally, with a simple structure and convenient operation.

[0047] In this embodiment, the interval adjustment component 616 includes two parallel screws 617 and threaded sleeves 618 respectively arranged on both sides of the movable side wall 615, the screws 617 are rotatably arranged on the frame 1, the threaded sleeves 618 are respectively sleeved on each screw 617, and the frame 1 is provided with a second rotation drive component 619 for driving each screw 617 to rotate synchronously. The threaded sleeve 618 is fixedly connected to the movable side wall 615, and the second rotation drive component 619 drives each screw 617 to rotate synchronously, driving the threaded sleeve 618 and the movable side wall 615 to move horizontally, with a simple structure and convenient operation.

[0048] In this embodiment, a vibrator 7 is provided on the powder spreading box 61 to prevent powder from remaining in the powder spreading box 61. Of course, a vibrator 7 can be provided on each powder distribution bin 62.

[0049] In this embodiment, Figure 4 As shown, both sides of the powder distribution bin 62 are provided with insertion strips 621, and the positions corresponding to the insertion strips 621 of the powder spreading box 61 are provided with sockets 8, and the insertion strips 621 are inserted into the corresponding sockets 8. The sockets 8 are arranged vertically, and the insertion strips 621 are adapted to the sockets 8. The powder distribution bin 62 is inserted into the powder spreading box 61 from top to bottom, which is convenient for disassembly and assembly.

[0050] In this embodiment, Figure 5 and Figure 6 As shown, the powder discharge valve body mechanism 63 includes a valve plate 633 disposed at the bottom opening of the powder distribution bin 62 and an opening and closing driving assembly 634 for driving the valve plate 633 to open and close. The opening and closing driving assembly 634 is used to drive the valve plate 633 to slide, adjust the opening size of the bottom opening of the powder distribution bin 62, and control the powder discharge amount of the powder distribution bin 62.

[0051] Embodiment 2:

[0052] Figure 8 and Fig. 9 Another embodiment of the multi-material powder mixing device of the present invention is shown. The structure of this embodiment is basically the same as that of the first embodiment, and the only difference is that the structure of the powder discharge valve body mechanism 63 is different. The powder discharge valve body mechanism 63 of this embodiment includes a powder discharge lever 631 and a motor 632 for driving the powder discharge lever 631 to rotate. The powder discharge lever 631 is rotatably arranged at the opening at the bottom of the powder distribution bin 62. The motor 632 is started, driving the powder discharge lever 631 to rotate, thereby driving the powder to rotate. The powder rotates to the lower part of the powder discharge lever 631 and falls freely to achieve powder dropping; when the powder discharge lever 631 stops rotating, the powder stops falling. In order to prevent the powder from blocking the bottom opening of the powder distribution bin 62, a vibrator 7 can be set on the outer wall of the powder distribution bin 62.

[0053] In this embodiment, the powder distribution bin 62 is inserted into the powder spreading box 61 from top to bottom, and the motor 632 is arranged on the outer wall of the powder spreading box 61 and is detachably connected to the powder placing lever 631. The powder distribution bin 62 is inserted into the powder spreading box 61 from top to bottom, which is convenient for disassembly and assembly. Specifically, both sides of the powder distribution bin 62 are provided with insertion strips 621, and the positions corresponding to the insertion strips 621 of the powder spreading box 61 are provided with sockets 8, and the insertion strips 621 are inserted into the corresponding sockets 8. The sockets 8 are arranged vertically, and the insertion strips 621 are adapted to the sockets 8.

[0054] Embodiment three:

[0055] A multi-material powder mixing method is performed using the multi-material powder mixing device of the first or second embodiment, comprising the following steps:

[0056] S1, putting powder: putting different powders into each powder mixing bin 62;

[0057] S2. Powder mixing and powder spreading: the powder discharge valve mechanisms 63 are opened in sequence at set time intervals in the order of arrangement along the downward inclination of the guide surface 611, so that the powder falling from the first valve opened and the powder falling from the later valve opened collide and mix on the guide surface 611 directly below the powder equalizing bin 62 of the later valve opened; the translation drive component drives the powder spreading box 61 to move horizontally at a set speed, and spreads the mixed powder onto the powder bed below.

[0058] Since the vertical distances of the powder-distributing bins 62 relative to the guide surface 611 are different, when the powder falls from the powder-distributing bin 62 onto the guide surface 611, the speed of the powder falling onto the guide surface 611 is different. The powder that first falls onto the guide surface 611 slides up and down on the guide surface 611, and the powder that falls later falls onto the powder that slides up and down on the guide surface 611, so as to achieve inclined surface powder mixing. The falling powder collides with the powder already existing on the guide surface 611, and the collision effect is different at different speeds. The powder undergoes a powder mixing process on the guide surface 611 and falls at the same time. When the mixed powder enters the powder mixing channel 613 after being preliminarily mixed on the guide surface 611, the powder cross-collides and rebounds between the opposite side walls of the powder mixing channel 613 and falls at the same time. Due to the different densities of the powders, the speed of the collision and rebound with the side walls and the falling speed are different, and then the powder is mixed again during the falling process in the powder mixing channel 613. The powders can be fully and evenly mixed by mixing the powders on the inclined surface and mixing the powders in the channel.

[0059] This multi-material powder mixing method realizes online mixing of multiple powders through the falling effect of the self-weight of each powder, shortens the processing time, and improves production efficiency; multiple powder distribution bins 62 are used to place different powders respectively, and multiple powders can be processed at the same time to realize the preparation of gradient functional plates and avoid imbalance in the mixing ratio of powders; the powder dropping time and amount are controlled by the powder discharge valve body mechanism 63, and each powder converges and collides on the guide surface 611, and then repeatedly collides and mixes in the powder mixing channel 613, with high mixing uniformity; the powder is spread by the horizontal movement of the powder spreading mechanism 6, without the need to use a roller-type powder spreading plate or a scraper-type powder spreading plate, and the powder spreading uniformity is good. This multi-material powder mixing method can improve production efficiency, powder mixing and powder spreading uniformity and product quality, and can reduce processing costs.

[0060] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-material powder mixing device, characterized in that: The invention comprises a frame (1) and a powder spreading mechanism (6) which is arranged on the frame (1) and can move horizontally, the powder spreading mechanism (6) comprising a powder spreading box (61) which can be arranged on the frame (1) in a translational manner and a plurality of powder distribution bins (62) arranged in the powder spreading box (61), the frame (1) is provided with a translation driving assembly for driving the powder spreading box (61) to move horizontally, the bottom of the powder spreading box (61) is provided with an inclined flow guide surface (611), the powder spreading box (61) is provided with a powder dropping port (612) at the bottom end of the flow guide surface (611), the powder spreading box (61) is provided with a powder mixing channel (613) below the powder dropping port (612), and each of the powder distribution bins (613) is provided with a powder mixing channel (613). The powder bins (62) are located above the guide surface (611) and are arranged at intervals along the inclined direction of the guide surface (611). The closer the powder bin (62) is to the powder drop port (612), the greater the vertical distance between the powder bin (62) and the guide surface (611). A powder discharge valve mechanism (63) is provided at the bottom of the powder bin (62). The powder mixing channel (613) has a fixed side wall (614) fixed to the powder spreading box (61) on one side close to the guide surface (611) and a movable side wall (615) on the other side. The frame (1) is provided with a spacing adjustment component (616) for adjusting the spacing between the fixed side wall (614) and the movable side wall (615).

2. The multi-material powder mixing device according to claim 1, characterized in that: The translation drive assembly comprises two parallel screw rods (64) and screw sleeves (65) respectively arranged on both sides of the powder spreading box (61); the screw rods (64) are rotatably arranged on the frame (1); the screw sleeves (65) are respectively sleeved on each screw rod (64); and the frame (1) is provided with a first rotation drive assembly (66) for driving each screw rod (64) to rotate synchronously.

3. The multi-material powder mixing device according to claim 1, characterized in that: The interval adjustment component (616) comprises two parallel screw rods (617) and threaded sleeves (618) respectively arranged on both sides of the movable side wall (615); the screw rods (617) are rotatably arranged on the frame (1); the threaded sleeves (618) are respectively sleeved on each screw rod (617); and a second rotation drive component (619) for driving each screw rod (617) to rotate synchronously is provided on the frame (1).

4. The multi-material powder mixing device according to claim 1, characterized in that: The powder spreading box (61) is provided with a vibrator (7).

5. The multi-material powder mixing device according to any one of claims 1 to 4, characterized in that: The powder discharge valve body mechanism (63) comprises a powder discharge lever (631) and a motor (632) for driving the powder discharge lever (631) to rotate, and the powder discharge lever (631) is rotatably arranged at the opening at the bottom of the powder distribution bin (62).

6. The multi-material powder mixing device according to claim 5, characterized in that: The powder distribution bin (62) is inserted into the powder spreading box (61) from top to bottom, and the motor (632) is arranged on the outer wall of the powder spreading box (61) and is detachably connected to the powder placing lever (631).

7. The multi-material powder mixing device according to claim 6, characterized in that: Insertion strips (621) are provided on both sides of the powder distribution bin (62), and sockets (8) are provided at positions of the powder spreading box (61) corresponding to the insertion strips (621), and the insertion strips (621) are inserted into the corresponding sockets (8).

8. The multi-material powder mixing device according to any one of claims 1 to 4, characterized in that: The powder discharge valve body mechanism (63) comprises a valve plate (633) arranged at the bottom opening of the powder distribution bin (62) and an opening and closing driving component (634) for driving the valve plate (633) to open and close.

9. A multi-material powder mixing method, characterized in that: The method is carried out using the multi-material powder mixing device according to any one of claims 1 to 8, comprising the following steps: S1, putting powder: putting different powders into each powder mixing bin (62); S2, powder mixing and powder spreading: the powder discharge valve mechanisms (63) are opened in sequence at set intervals in the order of arrangement along the downward inclination direction of the guide surface (611), so that the powder falling from the first valve opened and the powder falling from the later valve opened collide and mix on the guide surface (611) directly below the powder distribution bin (62) of the later valve opened; the translation drive component drives the powder spreading box (61) to move horizontally at a set speed, spreading the mixed powder onto the powder bed below.

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