Material mixing device for additive manufacturing powder

Abstract

The utility model belongs to the technical field of additive manufacturing, and discloses a material mixing device for additive manufacturing of powder, which comprises a material mixing tank, a premixing assembly is mounted at the top of the material mixing tank, a material mixing assembly is mounted on the material mixing tank, the material mixing assembly comprises an air outlet pipe, the end part of the air outlet pipe penetrates through the material mixing tank and is connected with an annular pipe, and the end part of the annular pipe penetrates through the material mixing tank. The annular pipe is connected with an air pump through a pipeline, an inlet of the air pump is connected with a filtering assembly, the air pump and the filtering assembly are both installed on the mixing tank, falling powder is blown and dispersed through airflow, the airflow enables the powder to be fully dispersed, suspended and collided and mixed in the space, and the more uniform mixing effect can be achieved. Especially for some powder systems with large density difference and wide particle size distribution, the airflow can better overcome the acting force between gravity and particles, so that powder with different properties is fully mixed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to additive manufacturing technical field, concretely is a kind of mixing device for additive manufacturing powder. BACKGROUND

[0002] Additive manufacturing is also commonly known as 3D printing, which is a technology based on digital model files to manufacture three-dimensional objects by layering materials. Additive manufacturing powder is a commonly used raw material in the additive manufacturing process. Commonly used materials include metal powder, plastic powder and ceramic powder. Additive manufacturing is widely used in aerospace, automotive manufacturing, biomedicine and electronics. Additive manufacturing powder mixing is an important part of the additive manufacturing process. By mixing powders of different compositions, the final material can have properties that single powders cannot achieve. In some additive manufacturing that requires color or appearance customization, mixing can precisely adjust the color. Mixing expensive high-performance powders with relatively inexpensive powders can reduce material costs while maintaining certain performance.

[0003] Chinese patent No. 202420303665.9 discloses a high-efficiency mixing device for additive manufacturing powder. The device includes a premixing box, a processing box fixed below the premixing box, and a mixing mechanism inside the processing box. The mixing mechanism includes a mixing cylinder that is rotatably connected to the inside of the processing box and has a worm gear fixed to the bottom end of the mixing cylinder. A first motor is embedded on one side of the outer wall of the processing box, and a worm is connected to the power output end of the first motor. The first motor drives the worm to rotate, which in turn drives the mixing cylinder to rotate, causing the raw materials to centrifugally rotate and further disperse under the participation of the stirring block. The raw materials are ejected from the through hole after being rotated by the mixing cylinder, which improves the uniformity of the raw materials during the later aggregation. The stirring block is driven by the drive rod and the second motor to stir in the mixing cylinder, increasing the fusion of the raw materials.

[0004] However, the above-mentioned high-efficiency mixing device for additive manufacturing powder has the following disadvantages in actual use: the mechanical stirring method of the mixing cylinder combined with the stirring block has general mixing effect, and it is difficult to uniformly disperse the powder.

[0005] Therefore, a mixing device for additive manufacturing powder is proposed to solve the above problems. Utility model content

[0006] To solve the problems raised in the background art, the utility model provides a mixing device for additive manufacturing powder, which has the advantages of utilizing airflow to fully disperse, suspend and collide with each other in space, and achieving more uniform mixing effect.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of mixing device for additive manufacturing powder, including mixing tank, the top of the mixing tank is equipped with premixing component, mixing component is installed on the mixing tank;

[0008] The mixing component includes an air outlet pipe, an annular pipe is connected to the end of the air outlet pipe, the annular pipe is connected to an air pump through a pipeline, the inlet of the air pump is connected to a filter assembly, and the air pump and the filter assembly are both installed on the mixing tank.

[0009] Preferably, the premixing component includes a plurality of premixing tanks uniformly distributed, a stirring assembly is installed on the premixing tank, a discharge port is connected to the bottom of the premixing tank, and the discharge port is above the air outlet end of the air outlet pipe.

[0010] Preferably, the premixing tank is provided with an inlet near the top on one side, the inlet is connected to an inlet pipe, and the top end of the inlet pipe is provided with a pipe joint.

[0011] Preferably, the stirring assembly includes a drive motor provided on the top of the premixing tank, the output end of the drive motor is connected to a stirring shaft, and the stirring shaft in the premixing tank is provided with a stirring rod.

[0012] Preferably, the bottom end of the mixing tank is provided with a discharge port.

[0013] Preferably, the air outlet end of the air outlet pipe is provided with a barrier net.

[0014] Preferably, the filter assembly includes a storage container, the inside of the storage container is provided with filter screens arranged in correspondence with each other, the filter screens are filled with filter adsorption fillers, and the top of the storage container is provided with an air inlet.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1、The utility model discloses a mixing device for additive manufacturing powder, which utilizes airflow to blow and disperse the falling powder, and the airflow makes the powder fully dispersed, suspended and collided in space, so that more uniform mixing effect can be achieved, especially for the powder system with large density difference and wide particle size distribution, the airflow can better overcome the gravity and the force between particles, so that the powder with different properties is fully mixed.

[0017] 2、The premixing component is provided, so that the powder is dispersed and injected into the premixing tank, and the stirring assembly is used to preliminarily mix the powder, so that the materials with different properties and different batches can preliminarily reach a relatively uniform distribution state, and the difference between the materials is reduced, which lays a foundation for subsequent deep mixing. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic view of the utility model;

[0019] Figure 2 It is the internal structure schematic view of the mixing tank of the utility model;

[0020] Figure 3 It is the sectional structure schematic view of the premixing tank of the utility model;

[0021] Figure 4 It is the structure schematic view of the mixing assembly of the utility model;

[0022] Figure 5 It is the structure schematic view of the filtering assembly of the utility model.

[0023] In the drawing: 1, mixing tank;

[0024] 2, premixing assembly; 201, premixing tank;

[0025] 202, stirring assembly; 2021, driving motor; 2022, stirring shaft; 2023, stirring rod;

[0026] 203, discharging port;

[0027] 3, mixing assembly; 301, air outlet pipe; 302, annular pipe; 303, air pump;

[0028] 304, filtering assembly; 3041, storage container; 3042, filtering screen; 3043, filtering adsorption filler; 3044, air inlet;

[0029] 305, barrier screen;

[0030] 4, feeding port; 5, feeding pipe; 6, pipe joint; 7, discharging port. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0032] As shown in Figures 1 to 5 The utility model provides a kind of mixing device for additive manufacturing powder, including mixing tank 1, premixing assembly 2 is installed on the top of mixing tank 1, mixing assembly 3 is installed on mixing tank 1;

[0033] The mixing assembly 3 comprises an air outlet pipe 301, the end of the air outlet pipe 301 is connected with an annular pipe 302 penetrating the mixing tank 1, the annular pipe 302 is connected with an air pump 303 through a pipeline, the inlet of the air pump 303 is connected with a filter assembly 304, the air pump 303 and the filter assembly 304 are both installed on the mixing tank 1, the falling powder is blown up and dispersed by the air flow, the powder is fully dispersed, suspended and collides and mixes in the space by the air flow, so that more uniform mixing effect can be achieved, especially for some powder systems with large density difference and wide particle size distribution, the air flow can better overcome the gravity and the force between particles, so that the powder with different properties is fully mixed.

[0034] Specifically, the premixing assembly 2 comprises a plurality of uniformly distributed premixing tanks 201, the premixing tanks 201 are provided with stirring assemblies 202, the bottoms of the premixing tanks 201 are connected with discharge ports 203 penetrating the mixing tank 1, the discharge ports 203 are above the air outlet end of the air outlet pipe 301, so that the powder is dispersed and injected into the premixing tanks 201, and the powder is preliminarily mixed by the stirring assemblies 202, the premixing can preliminarily achieve a more uniform distribution state of the materials with different properties and different batches, and reduce the difference between the materials, thereby laying a foundation for subsequent deep mixing.

[0035] Further, the premixing tank 201 is provided with an inlet 4 near the top on one side, the inlet 4 is connected with an inlet pipe 5, and the top end of the inlet pipe 5 is provided with a pipeline joint 6 for guiding the powder into the plurality of premixing tanks 201.

[0036] Still further, the stirring assembly 202 comprises a driving motor 2021 arranged at the top of the premixing tank 201, the output end of the driving motor 2021 is connected with a stirring shaft 2022, and the stirring shaft 2022 in the premixing tank 201 is provided with a stirring rod 2023 for preliminarily mixing the powder in the premixing tank 201.

[0037] It is worth noting that the bottom end of the mixing tank 1 is provided with a discharge port 7 for discharging the mixed powder.

[0038] It is worth noting that the air outlet end of the air outlet pipe 301 is provided with a barrier net 305 to prevent the powder from entering the air outlet pipe 301.

[0039] It is worth noting that the filter assembly 304 comprises a storage container 3041, the inside of the storage container 3041 is provided with filter screens 3042 arranged in an upper-lower corresponding manner, the filter screens 3042 are filled with filter adsorption fillers 3043, and the top of the storage container 3041 is provided with an air inlet 3044 to prevent impurities and water vapor in the air from contacting and mixing with the powder.

[0040] Among them, the driving motor 2021, the air pump 303 are prior art, will not repeat; at the same time, the utility model still includes power, controller and switch etc., it is not the main technical point of this patent, will not repeat.

[0041] Working principle and flow: the additive manufacturing powder is input into the premixing tank 201 under the action of the feed pump through the pipe joint 6, the feed pipe 5, the feed inlet 4, the driving motor 2021 of the stirring assembly 202 is started, and then the stirring shaft 2022 drives the stirring rod 2023 to rotate, so that the powder in the premixing tank 201 can be preliminarily mixed, the powder in the premixing tank 201 leaves the premixing tank 201 under the action of gravity, the air pump 303 of the mixing assembly 3 is started, the outside air enters the filtering assembly 304, under the adsorption of the filtering adsorption filler 3043, the impurities and water vapor in the air are removed, and then the clean air is discharged through the air pump 303, the annular pipe 302 and the air outlet pipe 301, so that the falling powder can be blown up and dispersed by the airflow, the airflow can make the powder fully dispersed, suspended and mixed with each other in the space, and the mixing effect can be more uniform, especially for some powder systems with large density difference and wide particle size distribution, the airflow can better overcome the force between gravity and particles, so that the powders with different properties can be fully mixed, finally, the mixed powder is discharged through the discharge port 7.

[0042] It should be noted that in this text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or equipment.

[0043] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A mixing device for additive manufacturing of a powder material, comprising a mixing tank (1), characterized in that: The top of the mixing tank (1) is provided with a premixing assembly (2), and the mixing tank (1) is provided with a mixing assembly (3); The mixing assembly (3) comprises an air outlet pipe (301), the end of the air outlet pipe (301) is connected with an annular pipe (302) penetrating the mixing tank (1), the annular pipe (302) is connected with an air pump (303) through a pipeline, the inlet of the air pump (303) is connected with a filtering assembly (304), and the air pump (303) and the filtering assembly (304) are both mounted on the mixing tank (1).

2. A mixing device for additive manufacturing powders according to claim 1, characterized in that: The premixing assembly (2) comprises a plurality of premixing tanks (201) uniformly distributed, the premixing tanks (201) are provided with stirring assemblies (202), the bottoms of the premixing tanks (201) are connected with discharge ports (203) penetrating the mixing tank (1), and the discharge ports (203) are located above the air outlet end of the air outlet pipe (301).

3. A mixing device for additive manufacturing of a powder material according to claim 2, characterized in that: The premixing tank (201) is provided with a feeding port (4) near the top on one side, the feeding port (4) is connected with a feeding pipe (5), and the top end of the feeding pipe (5) is provided with a pipeline joint (6).

4. A mixing device for additive manufacturing of a powder material according to claim 2, characterized in that: The stirring assembly (202) comprises a driving motor (2021) arranged on the top of the premixing tank (201), the output end of the driving motor (2021) is connected with a stirring shaft (2022), and the stirring shaft (2022) in the premixing tank (201) is provided with a stirring rod (2023).

5. A mixing device for additive manufacturing of powders according to claim 1, characterized in that: The bottom end of the mixing tank (1) is provided with a discharge port (7).

6. A mixing device for additive manufacturing of powders according to claim 1, characterized in that: The air outlet end of the air outlet pipe (301) is provided with a barrier net (305).

7. A mixing device for additive manufacturing of powders according to claim 1, characterized in that: The filtering assembly (304) comprises a storage container (3041), the inside of the storage container (3041) is provided with filtering barrier nets (3042) arranged in correspondence with each other, the filtering barrier nets (3042) are filled with filtering and adsorbing fillers (3043), and the top of the storage container (3041) is provided with an air inlet (3044).

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