A nested funnel ultrasonic mixing type multi-material binder jetting apparatus

Abstract

The application discloses a nested funnel ultrasonic mixing type multi-material binder jet forming device, which comprises a powder supply assembly, a mixing assembly and a forming assembly. The powder supply assembly comprises an outer funnel and an inner funnel. The mixing assembly comprises a mixing chamber and a plurality of ultrasonic transducers. The forming assembly comprises a powder spreading roller, an inkjet print head and a building platform. The powder spreading roller is arranged below the mixing chamber, the inkjet print head is arranged on one side of the powder spreading roller, and the building platform is horizontally arranged directly below the powder spreading roller and the inkjet print head. A valve is arranged between the bottom discharge port of the mixing chamber and a powder spreading area where the powder spreading roller is arranged. The nested funnel and the ultrasonic mixing are cooperatively designed, independent powder supply and in-situ mixing of multi-material powder are realized, and the additive manufacturing of gradient functional material parts is suitable.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to a nested funnel ultrasonic mixing multi-material binder spraying molding apparatus. Background Technology

[0002] Binder jetting is an important branch of additive manufacturing. This technology uses an inkjet printer to selectively jet a binder onto a powder bed, causing powder particles to bond layer by layer to form a three-dimensional solid part. Compared to other additive manufacturing technologies, binder jetting offers advantages such as high forming speed, wide applicability of materials, and no need for supporting structures. It is widely used in ceramic components, metal parts, and sand casting molds.

[0003] With the increasing demands for component performance in aerospace, biomedical, and automotive manufacturing industries, single-material components are no longer sufficient to meet the needs of complex operating conditions. Integrating two or more different powder materials into a single component to fabricate structural parts with gradient functions allows for the spatial customization of material properties, becoming a research hotspot in additive manufacturing. Gradient function material components can exhibit different mechanical, thermophysical, or chemical properties in different regions of the same component, effectively solving the problem of limited performance of single materials.

[0004] Currently, the following powder supply schemes are mainly used for multi-material binder spray forming: the first is the multi-powder-spreading roller zone powder spreading scheme, in which different powders of different materials are spread in different areas of the powder bed by different powder spreading rollers; the second is the switchable hopper powder supply scheme, in which different powder materials are supplied by switching different hoppers; the third is the vacuum adsorption powder changing scheme, in which the already spread powder is removed by vacuum adsorption before another type of powder is spread.

[0005] All of the above solutions have varying degrees of drawbacks: In the partitioned powder spreading scheme, it is difficult to precisely control the boundaries of powder beds of different materials, resulting in severe cross-contamination between adjacent material areas and an inability to obtain a clear material interface; the hopper switching scheme requires interrupting the printing process during material change, and respreading powder after changing the hopper, leading to a significant reduction in forming efficiency, and impurities are easily introduced during the material change process; the vacuum adsorption scheme has poor adsorption effect on ultrafine powders, resulting in a large amount of powder residue and cross-contamination problems; more importantly, the existing solutions cannot achieve in-situ uniform mixing of the two powders during the powder supply stage. Powder mixing must be completed offline before being loaded into the hopper, resulting in a long process chain, and stratification and segregation are prone to occur during powder transfer and spreading, making it difficult to ensure mixing uniformity and restricting the forming quality of graded functional material parts.

[0006] To address the aforementioned technical issues, this invention provides a nested funnel ultrasonic mixing multi-material adhesive spraying forming device. Summary of the Invention

[0007] The purpose of this invention is to provide a nested funnel ultrasonic mixing multi-material adhesive spraying forming device to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a nested funnel ultrasonic mixing type multi-material adhesive spraying forming device, comprising: A powder supply assembly includes an outer funnel and an inner funnel. Both the outer funnel and the inner funnel are conical structures with a large opening at the top and a small opening at the bottom. The outer funnel is sleeved on the outside of the inner funnel. The central axis of the outer funnel coincides with the central axis of the inner funnel. An annular space is formed between the inner wall of the outer funnel and the outer wall of the inner funnel. A conical space is formed inside the inner funnel. A mixing assembly, comprising a mixing chamber and a plurality of ultrasonic transducers, wherein the mixing chamber is located directly below the powder supply assembly, and the bottom openings of the outer funnel and the inner funnel are both connected to the interior of the mixing chamber, and the plurality of ultrasonic transducers are respectively installed on the outer walls of the two sides of the mixing chamber. A forming assembly, comprising a powder spreading roller, an inkjet printhead, and a building platform, wherein the powder spreading roller is disposed below the mixing chamber, the inkjet printhead is disposed on one side of the powder spreading roller, and the building platform is horizontally disposed directly below the powder spreading roller and the inkjet printhead; A valve is provided between the bottom outlet of the mixing chamber and the powder spreading area where the powder spreading roller is located.

[0009] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming apparatus provided by the present invention, the upper inner diameter of the outer funnel is larger than the upper outer diameter of the inner funnel, the lower inner diameter of the outer funnel is larger than the lower outer diameter of the inner funnel, and the bottom openings of the outer funnel and the inner funnel both face the interior of the mixing chamber.

[0010] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming apparatus provided by the present invention, the number of ultrasonic transducers is two sets, the two sets of ultrasonic transducers are symmetrically arranged on the outer walls of both sides of the mixing chamber, and the radiating ends of the two sets of ultrasonic transducers face the interior of the mixing chamber.

[0011] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming device provided by the present invention, the cross-section of the mixing chamber is rectangular or circular, the upper end of the mixing chamber is provided with two feed ports, the two feed ports are respectively connected to the bottom opening of the outer funnel and the bottom opening of the inner funnel, and the lower end of the mixing chamber is provided with a discharge port, which is connected to the upper end of the valve.

[0012] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming apparatus provided by the present invention, the valve is disposed at the bottom outlet of the mixing chamber, the upper end of the valve is connected to the bottom end of the mixing chamber, and the lower end of the valve faces upwards towards the powder spreading roller.

[0013] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming apparatus provided by the present invention, the powder spreading roller has a cylindrical roller structure, the powder spreading roller is horizontally arranged above the construction platform, and the axial direction of the powder spreading roller is parallel to the upper surface of the construction platform.

[0014] According to the nested funnel ultrasonic hybrid multi-material adhesive jetting forming apparatus provided by the present invention, the inkjet printhead is connected to an X-axis scanning mechanism, the X-axis scanning mechanism is disposed above the construction platform, and the movement direction of the X-axis scanning mechanism is parallel to the upper surface of the construction platform.

[0015] According to the nested funnel ultrasonic mixing multi-material adhesive spraying forming device provided by the present invention, a Z-axis lifting mechanism is connected below the construction platform, and the lifting direction of the Z-axis lifting mechanism is perpendicular to the upper surface of the construction platform.

[0016] The present invention discloses the following technical effects: This invention employs a concentric nested double-layer funnel structure, with two powder materials respectively contained in the outer and inner funnels. The supply processes are independent and physically isolated, preventing cross-contamination between different powder materials during powder feeding. The nested funnel structure has a compact layout, occupies little space, and is easy to integrate with existing binder spraying molding equipment, reducing the modification cost of multi-material powder supply systems.

[0017] This invention incorporates an ultrasonic mixing chamber at the bottom of a funnel. An ultrasonic transducer radiates high-frequency ultrasonic waves into the mixing chamber, causing the two powders to collide and diffuse with each other during their descent, achieving in-situ uniform mixing. The mixing process is synchronized with the powder feeding process, eliminating the need for an offline mixing step, shortening the process chain, and avoiding contamination and segregation problems during powder transfer.

[0018] This invention allows for flexible control of the mixing ratio and uniformity of two powders by adjusting the operating parameters of the ultrasonic transducer and the valve opening time, thus meeting the manufacturing requirements of parts made from materials with different functional gradients. The device has a simple overall structure, stable operation, and is suitable for binder spraying molding of various material combinations such as ceramics and metals, ceramics and polymers, and metals and polymers. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the nested funnel ultrasonic mixing multi-material adhesive spraying forming device of the present invention; Figure 2 This is a schematic diagram of the internal structure of the ultrasonic mixing chamber of the present invention.

[0021] The components include: 1. Construction platform; 2. Outer funnel; 3. Inner funnel; 4. Ultrasonic transducer; 5. Mixing chamber; 6. Valve; 7. Powder spreading roller; 8. Inkjet printhead; 9. X-axis scanning mechanism; 10. Z-axis lifting mechanism; 11. First powder material; 12. Second powder material. Detailed Implementation

[0022] The technical solutions of 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] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figure 1-2 This invention provides a nested funnel ultrasonic mixing multi-material adhesive spraying forming device, comprising: The powder supply assembly includes an outer funnel 2 and an inner funnel 3. Both the outer funnel 2 and the inner funnel 3 are conical structures with a large opening at the top and a small opening at the bottom. The outer funnel 2 is fitted outside the inner funnel 3. The central axis of the outer funnel 2 coincides with the central axis of the inner funnel 3. An annular space is formed between the inner wall of the outer funnel 2 and the outer wall of the inner funnel 3. A conical space is formed inside the inner funnel 3. The mixing assembly includes a mixing chamber 5 and several ultrasonic transducers 4. The mixing chamber 5 is located directly below the powder supply assembly. The bottom openings of the outer funnel 2 and the inner funnel 3 are both connected to the interior of the mixing chamber 5. Several ultrasonic transducers 4 are respectively installed on the outer walls of both sides of the mixing chamber 5. The forming assembly includes a powder spreading roller 7, an inkjet printhead 8, and a building platform 1. The powder spreading roller 7 is located below the mixing chamber 5, the inkjet printhead 8 is located on one side of the powder spreading roller 7, and the building platform 1 is horizontally located directly below the powder spreading roller 7 and the inkjet printhead 8. A valve 6 is installed between the bottom outlet of the mixing chamber 5 and the powder spreading area where the powder spreading roller 7 is located.

[0025] The outer funnel 2 and the inner funnel 3 are arranged concentrically. The outer funnel 2 contains the first powder material 11, and the inner funnel 3 contains the second powder material 12. Under the action of gravity, the two powders flow downwards along the conical walls of their respective funnels and converge into the mixing chamber 5 located below through the bottom openings of the funnels. The ultrasonic transducers 4, symmetrically installed on both sides of the outer walls of the mixing chamber 5, are activated, radiating ultrasonic waves into the mixing chamber 5 and forming a high-frequency sound field within it. The two powder particles entering the mixing chamber 5 undergo high-frequency collisions and relative motion under the action of the ultrasonic sound field, diffusing and interpenetrating from their respective feeding positions towards the center of the mixing chamber 5, achieving uniform mixing during the falling process. The uniformly mixed powder falls through the discharge port at the bottom of the mixing chamber 5, and the valve 6 controls the timing and amount of the mixed powder falling. After the valve 6 is opened, the mixed powder falls to the powder spreading area above the construction platform 1, and the powder spreading roller 7 moves horizontally to spread the mixed powder into a powder layer of uniform thickness. After the powder is spread, the inkjet printhead 8, driven by the X-axis scanning mechanism 9, scans horizontally and sprays binder at the set positions on the powder layer surface according to the slice data, causing the powder particles to selectively adhere. After the current layer is printed, the Z-axis lifting mechanism 10 drives the building platform 1 to descend vertically by one layer thickness. The valve 6 reopens to supply mixed powder, the powder spreading roller 7 spreads a new layer of powder, and the inkjet printhead 8 sprays the next layer of binder. The above cycle of powder supply, mixing, powder spreading, spraying, and platform descent is repeated until the entire part is formed layer by layer.

[0026] The scheme is further optimized so that the upper inner diameter of the outer funnel 2 is larger than the upper outer diameter of the inner funnel 3, the lower inner diameter of the outer funnel 2 is larger than the lower outer diameter of the inner funnel 3, and the bottom openings of the outer funnel 2 and the inner funnel 3 both face the interior of the mixing chamber 5.

[0027] The inner diameter of the upper end of the outer funnel 2 is larger than the outer diameter of the upper end of the inner funnel 3, ensuring that the inner funnel 3 can be smoothly inserted into the outer funnel 2 from above without structural interference during assembly. The inner diameter of the lower end of the outer funnel 2 is larger than the outer diameter of the lower end of the inner funnel 3, so that the bottom ends of the two funnels maintain independent discharge channels after nesting, and the two powders fall from their respective channels without contacting each other before reaching the mixing chamber 5. The concentric arrangement of the two funnels with their central axes coincides ensures that the annular cross-section of the outer funnel 2 and the circular cross-section of the inner funnel 3 are symmetrically distributed on the same central line. The falling trajectories of the two powders converge symmetrically along the central axis, and their initial positions are symmetrically distributed when entering the mixing chamber 5, providing symmetrical feeding conditions for subsequent ultrasonic uniform mixing and avoiding uneven mixing problems caused by feed position deviation. The bottom openings of both funnels face the inside of the mixing chamber 5, allowing the powder to fall directly into the ultrasonic action area of ​​the mixing chamber 5, reducing powder accumulation and adhesion in the transition section.

[0028] To further optimize the design, the number of ultrasonic transducers 4 is two sets, which are symmetrically arranged on the outer walls of both sides of the mixing chamber 5, with the radiating ends of both sets of ultrasonic transducers 4 facing the interior of the mixing chamber 5.

[0029] Two sets of ultrasonic transducers 4 are symmetrically installed on the outer walls of both sides of the mixing chamber 5, with their radiating ends facing the interior of the mixing chamber 5. They simultaneously radiate ultrasonic waves from both sides towards the center of the mixing chamber 5. The two ultrasonic beams meet and superimpose in the central region of the mixing chamber 5, forming a standing wave sound field. This results in a more uniform distribution of sound field energy across the cross-section of the mixing chamber 5, avoiding the problems of excessively strong near-field energy and excessively rapid far-field energy attenuation caused by a single-sided transducer. The symmetrical arrangement ensures that the ultrasonic excitation intensity experienced by the powders on both sides is approximately equal. The two types of powder particles acquire similar vibration acceleration and diffusion kinetic energy, and their tendency to diffuse from their respective feed positions to the opposite side is symmetrical. During the mixing process, the diffusion depth and collision probability of the two powders tend to be consistent, thus achieving higher mixing uniformity. The opposing radiation also forms a sound pressure node region in the center of the mixing chamber 5, prompting powder particles to aggregate and collide near the node, enhancing the mixing effect.

[0030] Further optimization of the scheme: the cross-section of the mixing chamber 5 is rectangular or circular. The upper end of the mixing chamber 5 is provided with two feed inlets, which are respectively connected to the bottom opening of the outer funnel 2 and the bottom opening of the inner funnel 3. The lower end of the mixing chamber 5 is provided with a discharge port, which is connected to the upper end of the valve 6.

[0031] The mixing chamber 5 has a rectangular or circular cross-section. A rectangular cross-section facilitates the planar installation of transducers on both sides, allowing the transducer radiating surfaces to fully conform to the sidewalls of the mixing chamber 5, resulting in high ultrasonic energy transfer efficiency. Furthermore, the rectangular cross-section provides a regular sound field distribution, facilitating the calculation and control of sound field parameters. A circular cross-section eliminates angular reflection interference during sound wave propagation, leading to a more uniform and stable sound field. Two independent feed inlets are located at the top of the mixing chamber 5, connecting to the bottom openings of the outer funnel 2 and the inner funnel 3, respectively. The two powders enter the mixing chamber 5 from different positions and undergo relative motion and mixing under ultrasonic action. A discharge port is located at the bottom of the mixing chamber 5, ensuring the continuous and stable discharge of the mixed powder through a single channel. The discharge port is directly connected to the upper end of the valve 6, with a short transition section, reducing powder residue and the risk of clogging.

[0032] In a further optimized design, valve 6 is positioned at the bottom outlet of mixing chamber 5, with its upper end connected to the bottom of mixing chamber 5 and its lower end facing upwards towards the powder spreading roller 7.

[0033] Valve 6 is located at the bottom outlet of mixing chamber 5, with its upper end directly connected to the bottom of mixing chamber 5 and its lower end facing upwards towards the powder spreading roller 7, placing valve 6 on the shortest path between mixing chamber 5 and the powder spreading area. When valve 6 is closed, the powder in mixing chamber 5 is sealed within the ultrasonic action area, where it continuously collides and mixes under ultrasonic action, extending the effective mixing time and improving mixing uniformity. When valve 6 is open, the uniformly mixed powder falls directly through the valve 6 channel to the powder spreading area in front of the powder spreading roller 7 under gravity, with a short and smooth falling path. The upper end of valve 6 is connected to the bottom of mixing chamber 5 to control the timing and amount of powder falling; the lower end of valve 6 facing upwards towards the powder spreading roller 7 ensures that the falling powder accurately lands in the powder supply area in front of the powder spreading roller 7, guaranteeing that the powder spreading roller 7 can promptly spread the powder into a uniform powder layer.

[0034] Further optimization of the scheme: the powder spreading roller 7 has a cylindrical roller structure, and the powder spreading roller 7 is horizontally set above the construction platform 1, with the axial direction of the powder spreading roller 7 parallel to the upper surface of the construction platform 1.

[0035] The powder spreading roller 7 has a cylindrical structure with a straight and uniform generatrix on its surface. During rolling, the contact line between the roller and the powder bed surface is continuous and the pressure distribution is uniform, compacting the powder into a layer of consistent thickness and density. The powder spreading roller 7 is horizontally positioned above the construction platform 1, with its axis parallel to the upper surface of the platform. This ensures that the roller's generatrix remains parallel to the powder bed surface, and the distance between the roller and the powder layer surface remains constant throughout the spreading process, resulting in a powder layer of uniform thickness along the roller axis. The cylindrical roller both pushes the powder forward to fill gaps and applies compaction to the powder layer through rolling. These two actions work together to give the spread powder layer good flatness and density, providing a uniform base for subsequent binder spraying and preventing a decrease in forming accuracy due to uneven powder layer thickness.

[0036] Further optimization of the scheme: the inkjet printhead 8 is connected to an X-axis scanning mechanism 9, which is positioned above the construction platform 1, and the movement direction of the X-axis scanning mechanism 9 is parallel to the upper surface of the construction platform 1.

[0037] The inkjet printhead 8 is connected to the X-axis scanning mechanism 9, which drives it to perform a linear scanning motion in the horizontal direction. This motion direction is parallel to the upper surface of the construction platform 1, ensuring that the distance between the printhead and the powder bed surface remains constant during scanning, resulting in consistent flight distances and uniform landing accuracy of the binder droplets. The X-axis scanning mechanism 9 drives the printhead to move at a constant speed along a set path. Based on the slice data, the printhead ejects binder droplets according to a set timing sequence during the motion. The droplets precisely land at the target positions on the powder layer surface, causing the powder particles to bond and solidify according to the set pattern. This horizontal scanning motion allows the printhead to reciprocate in only one direction during single-layer printing, simplifying motion control, providing high positioning accuracy, and offering adjustable scanning speed. This allows for matching the optimal ejection frequency and scanning speed to different materials and layer thickness requirements.

[0038] To further optimize the design, a Z-axis lifting mechanism 10 is connected to the bottom of the construction platform 1, and the lifting direction of the Z-axis lifting mechanism 10 is perpendicular to the upper surface of the construction platform 1.

[0039] A Z-axis lifting mechanism 10 is connected below the construction platform 1. The lifting direction is perpendicular to the upper surface of the construction platform 1, ensuring that the platform remains horizontal during lifting. The relative distance between the upper surface of the platform and the powder spreading roller 7 and inkjet printhead 8 changes only in the vertical direction, with no horizontal offset. After each layer of powder spreading and binder spraying is completed, the Z-axis lifting mechanism 10 drives the construction platform 1 to descend precisely by one layer thickness, restoring the relative position of the upper surface of the newly spread powder layer with the powder spreading roller 7 and printhead to the initial state of the previous layer, providing an accurate height reference for the next layer of powder spreading and printing. The vertical lifting motion is spatially decoupled from the horizontal powder spreading and printing motions, and the motion control is independent. The positioning accuracy of each layer does not accumulate, ensuring the dimensional accuracy of the entire part in the height direction and the alignment accuracy between layers.

[0040] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0041] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A nested funnel ultrasonic mixing type multi-material adhesive spraying molding device, characterized in that, include: The powder supply assembly includes an outer funnel (2) and an inner funnel (3). Both the outer funnel (2) and the inner funnel (3) are conical structures with a large opening at the top and a small opening at the bottom. The outer funnel (2) is sleeved on the outside of the inner funnel (3). The central axis of the outer funnel (2) coincides with the central axis of the inner funnel (3). An annular space is formed between the inner wall of the outer funnel (2) and the outer wall of the inner funnel (3). A conical space is formed inside the inner funnel (3). The mixing assembly includes a mixing chamber (5) and a plurality of ultrasonic transducers (4). The mixing chamber (5) is located directly below the powder supply assembly. The bottom opening of the outer funnel (2) and the bottom opening of the inner funnel (3) are both connected to the interior of the mixing chamber (5). The plurality of ultrasonic transducers (4) are respectively installed on the outer walls of both sides of the mixing chamber (5). The forming assembly includes a powder spreading roller (7), an inkjet printhead (8), and a building platform (1). The powder spreading roller (7) is disposed below the mixing chamber (5), the inkjet printhead (8) is disposed on one side of the powder spreading roller (7), and the building platform (1) is horizontally disposed directly below the powder spreading roller (7) and the inkjet printhead (8). A valve (6) is provided between the bottom outlet of the mixing chamber (5) and the powder spreading area where the powder spreading roller (7) is located.

2. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The upper inner diameter of the outer funnel (2) is greater than the upper outer diameter of the inner funnel (3), the lower inner diameter of the outer funnel (2) is greater than the lower outer diameter of the inner funnel (3), and the bottom openings of the outer funnel (2) and the inner funnel (3) both face the interior of the mixing chamber (5).

3. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The number of ultrasonic transducers (4) is two sets. The two sets of ultrasonic transducers (4) are symmetrically arranged on the outer walls of both sides of the mixing chamber (5). The radiating ends of the two sets of ultrasonic transducers (4) face the interior of the mixing chamber (5).

4. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The mixing chamber (5) has a rectangular or circular cross-section. The upper end of the mixing chamber (5) is provided with two feed inlets, which are respectively connected to the bottom opening of the outer funnel (2) and the bottom opening of the inner funnel (3). The lower end of the mixing chamber (5) is provided with a discharge port, which is connected to the upper end of the valve (6).

5. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The valve (6) is located at the bottom outlet of the mixing chamber (5), with the upper end of the valve (6) connected to the bottom end of the mixing chamber (5) and the lower end of the valve (6) facing upwards towards the powder spreading roller (7).

6. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The powder spreading roller (7) has a cylindrical roller structure. The powder spreading roller (7) is horizontally arranged above the construction platform (1), and the axial direction of the powder spreading roller (7) is parallel to the upper surface of the construction platform (1).

7. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The inkjet printhead (8) is connected to an X-axis scanning mechanism (9), which is located above the construction platform (1). The movement direction of the X-axis scanning mechanism (9) is parallel to the upper surface of the construction platform (1).

8. The nested funnel ultrasonic mixing type multi-material adhesive spraying forming device according to claim 1, characterized in that, The construction platform (1) is connected to a Z-axis lifting mechanism (10) below it. The lifting direction of the Z-axis lifting mechanism (10) is perpendicular to the upper surface of the construction platform (1).

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