Device for grading spherical metal powder by using liquid phase centrifugal dispersion method

Abstract

The utility model relates to a device for grading spherical metal powder by using a liquid phase centrifugal dispersion method, and belongs to the technical field of grading devices. Comprising a centrifugal dispersion container, a communicating pipe, a stirring mechanism and a collecting container, a stirring mechanism is arranged in the centrifugal dispersion container, dispersion liquid is contained in the centrifugal dispersion container, a collecting container is arranged on the outer side of the centrifugal dispersion container and connected with the centrifugal dispersion container through a communicating pipe, a valve is arranged on the communicating pipe, and the heights of connecting points of the communicating pipe and the centrifugal dispersion container are different. Original metal powder is added into the feeding device in a vibration mode, vibration is conducted firstly, and the metal powder is dispersed for one time as much as possible. The metal powder is added into the centrifugal dispersion system and is uniformly dispersed in the centrifugal dispersion container under the stirring of the propeller, and the collision between the metal powder and the container wall is reduced due to the protection of the dispersion liquid, so that the metal powder is fully protected, and the technical problem that the surface of the graded metal powder is damaged is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of grading device technology, and in particular to a device for grading spherical metal powder using liquid phase centrifugal dispersion. Background Technology

[0002] With the miniaturization of electronic packaging technology, solder powder of different particle sizes is required during solder printing. Different application scenarios also require raw materials of different particle sizes. However, the preparation technology of solder powder is diverse, resulting in uneven particle size of the prepared metal powder, and sometimes the particle size difference can be quite large. In order to obtain metal powder with a narrow range, it is necessary to classify the obtained metal powder.

[0003] Currently, the commonly used classification methods include ultrasonic sieving and airflow classification. However, these methods have many drawbacks. The most significant problem is that the surface of the metal powder is damaged after classification, resulting in low production efficiency, increased oxidation, and poor flowability in the use of metal solder powder.

[0004] For example, the patent application number CN115400954A specifically discloses a metal powder classification device, which mainly describes an airflow classification method, including an air inlet, an air outlet, a feeding device, a screen, a vibration device, and a collection device. Due to the influence of airflow, there are collisions between metal balls or between metal balls and the screen during classification, which leads to damage to the surface of the metal powder after classification, and there is also the problem of screen clogging. Utility Model Content

[0005] To solve or partially solve the problems existing in related technologies, this utility model provides a device for classifying spherical metal powder using liquid-phase centrifugal dispersion, aiming to solve the technical problem that the surface of metal powder is damaged after classification by existing equipment.

[0006] The above-mentioned apparatus for classifying spherical metal powder using liquid-phase centrifugal dispersion includes a centrifugal dispersion container, a connecting tube, a stirring mechanism, and a collection container;

[0007] The centrifugal dispersion container is equipped with a stirring mechanism and contains a dispersion liquid. At least two collection containers are provided on the outside of the centrifugal dispersion container. Each collection container is connected to the centrifugal dispersion container through a connecting pipe. Each connecting pipe is equipped with a valve, and the connection point between each connecting pipe and the centrifugal dispersion container is set at a different height.

[0008] In some designs, the middle of the connecting pipe is bent upwards;

[0009] The inclination angle of the connecting section between the connecting tube and the centrifugal dispersion container is 10° to 45°; the roughness Ra of the inner surface of the connecting tube is ≤0.8μm; the wall thickness of the connecting tube is 1mm to 5mm; and the inner diameter of the connecting tube is 10mm to 30mm.

[0010] In some embodiments, the centrifugal dispersion container (1) is cylindrical, with an inner diameter of 100 mm to 1000 mm, a wall thickness of 2 mm to 10 mm, and a height of 500 mm to 1000 mm.

[0011] In some embodiments, the stirring mechanism includes a stirring shaft, stirring blades, and a stirring motor;

[0012] The stirring shaft is rotatably installed inside the centrifugal dispersion container and is driven to rotate by a stirring motor installed on the top of the centrifugal dispersion container. The lower end of the stirring shaft is provided with stirring blades, which adopt a single spiral structure or a double spiral structure.

[0013] In some embodiments, when the inner diameter of the centrifugal dispersion container is less than 500 mm, the stirring blade adopts a single spiral; when the inner diameter of the centrifugal dispersion container is greater than 500 mm, the stirring blade adopts a double spiral.

[0014] In some embodiments, the number of stirring blades is 5 to 10; the thickness of the stirring blades is 2 mm to 10 mm.

[0015] In some designs, the stirring motor rotates at speeds from 2000 rpm to 10000 rpm.

[0016] In some embodiments, a feed pipe is also included, the lower end of which is inserted into the centrifugal dispersion container and extends to the bottom, and the upper end of the feed pipe is provided with a vibrating feeder.

[0017] In some embodiments, the inner diameter of the collection container is 100mm to 500mm; the wall thickness of the collection container is 2mm to 5mm; and the height of the collection container is 500mm to 1000mm.

[0018] In some embodiments, the dispersion comprises one or more of water, ethanol, glycerol, dilute hydrochloric acid, and sodium acetate hydroxide solution.

[0019] The technical solution provided by this utility model can include the following beneficial effects:

[0020] 1. This application employs a vibration method in the feeding device to add the original metal powder, first dispersing the powder to maximize its initial dispersion. The metal powder is then added to a centrifugal dispersion system, where it is uniformly dispersed within the centrifugal dispersion container under the agitation of a propeller. During this process, the dispersion liquid protects the metal powder, reducing collisions with the container walls and effectively preventing surface damage after grading. Simultaneously, the dispersion liquid's viscosity supports the metal powder, further reducing its settling speed and even preventing it from settling altogether, thus providing ample time for grading. Once uniformly dispersed, the top valve of the communicating vessel is opened, and after a period of time, the first-level communicating vessel below it is opened to begin grading. Finally, all metal powder passing through the communicating vessels is collected in a collection device to achieve the grading of spherical metal powder.

[0021] 2. First, disperse the material using a vibrating feeder to ensure that it enters the centrifugal dispersion device in a loose state;

[0022] 3. The communicating vessel is designed in an arc shape so that some large particles enter the communicating vessel and flow back down under the action of gravity, returning to the dispersion system. The metal sphere powder obtained by classification has a smaller narrow range.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0025] Figure 1 This is a schematic diagram of the structure of a device for classifying spherical metal powder according to an embodiment of the present invention;

[0026] Figure 2 This is another structural schematic diagram of the device for classifying spherical metal powder shown in an embodiment of the present invention;

[0027] Figure label:

[0028] 1. Centrifugal dispersion container; 2. Connecting pipe; 3. Stirring mechanism; 31. Stirring shaft; 32. Stirring blades; 33. Stirring motor; 4. Collection container; 5. Valve; 6. Feed pipe; 7. Vibrating feeder. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0030] Please see Figure 1 and Figure 2 This application provides an apparatus for classifying spherical metal powder using liquid-phase centrifugal dispersion, comprising a centrifugal dispersion container 1, a connecting pipe 2, a stirring mechanism 3, and a collecting container 4; the centrifugal dispersion container 1 is cylindrical, with an inner diameter of 100mm to 1000mm, a wall thickness of 2mm to 10mm, and a height of 500mm to 1000mm; the collecting container 4 is also cylindrical, with an inner diameter of 100mm to 500mm, a wall thickness of 2mm to 5mm, and a height of 500mm to 1000mm.

[0031] The centrifugal dispersion container 1 is equipped with a stirring mechanism 3 and contains a dispersion liquid. At least two collection containers 4 are provided on the outside of the centrifugal dispersion container 1. Each collection container 4 is connected to the centrifugal dispersion container 1 through a connecting pipe 2. Each connecting pipe 2 is equipped with a valve 5, and the connection point between each connecting pipe 2 and the centrifugal dispersion container 1 is set at a different height.

[0032] During operation, the spherical metal powder to be graded is fed into the centrifugal dispersion container 1 manually or by an external feeding device. Then, the stirring mechanism 3 operates to mix the spherical metal powder to be graded with the dispersion liquid evenly. After that, the stirring mechanism 3 stops working. After a period of time, due to the different sedimentation rates of metal powders of different particle sizes, a large number of small-diameter metal powders accumulate in the upper layer of the dispersion liquid, a large number of medium-diameter metal powders accumulate in the middle layer of the dispersion liquid, and a large number of large-diameter metal powders accumulate in the lower layer. Then, the valves 5 on the connecting pipes 2 at different heights are opened sequentially from top to bottom, so that the upper, middle and lower layers of the dispersion liquid are guided to different collection containers 4 through the corresponding connecting pipes 2. Thus, metal spherical powders with small particle size differences are obtained in different collection containers 4, that is, metal powders with a narrow range, thereby realizing the grading of spherical metal powders.

[0033] During the stirring process, the presence of the dispersion liquid fully protects the metal powder, reducing collisions between the metal powder and the container wall, between metal powders, and between the metal powder and the stirring blade 32, thereby reducing the damage to the surface of the metal balls during classification.

[0034] In some specific embodiments, the middle part of the connecting pipe 2 is bent upward, that is, the section of the connecting pipe 2 near the centrifugal dispersion container 1 is inclined upward, and the section near the collection container 4 is inclined downward. In this way, when the valve 5 corresponding to the connecting pipe 2 is opened, if there are large metal balls entering the connecting pipe 2, since the metal balls need to flow upward when they first enter the connecting pipe 2, most of the large metal balls will flow back to the centrifugal dispersion container 1, thereby effectively improving the enrichment of narrow-range metal powder in the collection container 4, and thus improving the classification effect of metal powder.

[0035] In this embodiment, the inclination angle of the connecting section between the connecting pipe 2 and the centrifugal dispersion container 1 is 10° to 45°; the roughness Ra of the inner surface of the connecting pipe 2 is ≤0.8μm; the wall thickness of the connecting pipe 2 is 1mm to 5mm; and the inner diameter of the connecting pipe 2 is 10mm to 30mm.

[0036] In this embodiment, the centrifugal dispersion container 1 is cylindrical, with an inner diameter of 100mm to 1000mm, a wall thickness of 2mm to 10mm, and a height of 500mm to 1000mm.

[0037] In some specific embodiments, the stirring mechanism 3 includes a stirring shaft 31, stirring blades 32, and a stirring motor 33. The stirring shaft 31 is rotatably mounted inside the centrifugal dispersion container 1 and is driven to rotate by the stirring motor 33 mounted on the top of the centrifugal dispersion container 1. The lower end of the stirring shaft 31 is provided with stirring blades 32, which adopt a single-helix structure or a double-helix structure. When working, the stirring motor 33 is energized and rotates, thereby driving the stirring blades 32 to rotate inside the centrifugal dispersion container 1 through the stirring shaft 31, thereby stirring the dispersion liquid and metal ball powder in the centrifugal dispersion container 1 evenly.

[0038] In this embodiment, when the inner diameter of the centrifugal dispersion container 1 is less than 500 mm, the stirring blade 32 adopts a single spiral; when the inner diameter of the centrifugal dispersion container 1 is greater than 500 mm, the stirring blade 32 adopts a double spiral.

[0039] In this embodiment, the number of blades of the stirring blade 32 is 5 to 10; the thickness of the blade of the stirring blade 32 is 2 mm to 10 mm.

[0040] In this embodiment, the stirring motor 33 rotates at a speed of 2000 rpm to 10000 rpm.

[0041] In some specific embodiments, the device for classifying spherical metal powder further includes a feed pipe 6, the lower end of which is inserted into the centrifugal dispersion container 1 and extends to the bottom. The upper end of the feed pipe 6 is provided with a vibrating feeder 7. During operation, the metal powder is first dispersed by vibration through the vibrating feeder 7, and then the metal powder is directly introduced into the bottom of the centrifugal dispersion container 1 through the feed pipe 6, ensuring that the powder is in a loose state when entering the centrifugal dispersion device, which is beneficial to improving the uniformity of dispersion of the metal spherical powder in the centrifugal dispersion container 1.

[0042] In some specific embodiments, the inner diameter of the collection container 4 is 100mm to 500mm; the wall thickness of the collection container 4 is 2mm to 5mm; and the height of the collection container 4 is 500mm to 1000mm.

[0043] In some specific embodiments, the dispersion includes one or more of water, ethanol, glycerol, dilute hydrochloric acid, and sodium acetate-hydrogen hydroxide solution.

[0044] In some specific embodiments, the dispersion comprises an organic solution or an inorganic mixture of water, ethanol, glycerol, dilute hydrochloric acid, sodium acetate hydroxide solution, etc.

[0045] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion, characterized in that: It includes a centrifugal dispersion container (1), a connecting pipe (2), a stirring mechanism (3), and a collection container (4); The centrifugal dispersion container (1) is equipped with a stirring mechanism (3) and contains a dispersion liquid. At least two collection containers (4) are provided on the outside of the centrifugal dispersion container (1). Each collection container (4) is connected to the centrifugal dispersion container (1) through a connecting pipe (2). Each connecting pipe (2) is equipped with a valve (5), and the connection point between each connecting pipe (2) and the centrifugal dispersion container (1) is set at a different height.

2. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 1, characterized in that: The middle part of the connecting pipe (2) is bent upward; The inclination angle of the connecting section between the connecting pipe (2) and the centrifugal dispersion container (1) is 10° to 45°; the roughness Ra of the inner surface of the connecting pipe (2) is ≤0.8μm; the wall thickness of the connecting pipe (2) is 1mm to 5mm; and the inner diameter of the connecting pipe (2) is 10mm to 30mm.

3. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 1, characterized in that: The centrifugal dispersion container (1) is cylindrical in shape, with an inner diameter of 100 mm to 1000 mm, a wall thickness of 2 mm to 10 mm, and a height of 500 mm to 1000 mm.

4. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 3, characterized in that: The stirring mechanism (3) includes a stirring shaft (31), stirring blades (32), and stirring motor (33); The stirring shaft (31) is rotatably installed inside the centrifugal dispersion container (1) and is driven to rotate by the stirring motor (33) installed on the top of the centrifugal dispersion container (1). The lower end of the stirring shaft (31) is provided with stirring blades (32), which adopt a single spiral structure or a double spiral structure.

5. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 4, characterized in that: When the inner diameter of the centrifugal dispersion container (1) is less than 500 mm, the stirring blade (32) adopts a single spiral; when the inner diameter of the centrifugal dispersion container (1) is greater than 500 mm, the stirring blade (32) adopts a double spiral.

6. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 4, characterized in that: The number of blades of the stirring blade (32) is 5 to 10; the thickness of the blade of the stirring blade (32) is 2 mm to 10 mm.

7. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 4, characterized in that: The stirring motor (33) has a rotation speed of 2000 rpm to 10000 rpm.

8. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 1, characterized in that: It also includes a feed pipe (6), the lower end of which is inserted into the centrifugal dispersion container (1) and extends to the bottom, and the upper end of the feed pipe (6) is provided with a vibrating feeder (7).

9. The apparatus for classifying spherical metal powders using liquid-phase centrifugal dispersion according to claim 1, characterized in that: The inner diameter of the collection container (4) is 100mm to 500mm; the wall thickness of the collection container (4) is 2mm to 5mm; and the height of the collection container (4) is 500mm to 1000mm.

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