KR20200064804A - Fine particle classifying appratus - Google Patents

Abstract

A fine powder distribution device comprises: a powder supply hopper for supplying fine powder having different particle sizes; a gas inlet connected to the powder supply hopper and flying the fine powder supplied from the powder supply hopper in a first direction using gas; and a multi-stage collector connected to the gas inlet and distributing the fine powder flying in the first direction according to a flight distance. According to an embodiment, it is possible to maximize the distribution efficiency and the distribution capacity of the fine powder.

Description

Fine powder classification device {FINE PARTICLE CLASSIFYING APPRATUS}

The present description relates to a fine powder classification device.

Generally, the fine powder classifying apparatus is a fine powder classifying apparatus.

Recently, as the automobile, mold, aviation, power generation, and machinery industries grow, the market for fine powders used for manufacturing parts having complex shapes is also gradually growing.

The manufacturing process of the metal powder is a spraying process in which the molten metal is powdered by spraying high-pressure water or gas into the molten metal stem while vertically dropping the molten metal using a converter or electric furnace through a tundish and a molten metal nozzle. It includes a classification process for separating the powder into an appropriate particle size using a classification device, and a powder crushing and mixing process.

Among them, as a conventional classification device used in the classification process, the sieve device frequently generates clogging of the metal mesh because the powder is classified according to the particle size using a sieve including a metal mesh, In addition, in the case of a powder having a particle size of 45 µm or less, there is a problem that the classification efficiency is greatly reduced.

In addition, as a conventional classifying device, there are a turbo classifier device and a cyclone type device classifying using centrifugal force applied to powder using a swirling gas stream, but both devices are classified. In order to increase the capacity, the cost of the device is enormous and there is a limit to the classification processing capacity.

One embodiment is to provide a fine powder classification device capable of maximizing the classification efficiency and the classification processing capacity of the fine powder.

In addition, even if the classification processing capacity of the fine powder is increased, it is intended to provide a fine powder classification device in which manufacturing cost and time are reduced.

One side is a powder supply hopper for supplying fine powders having different particle sizes, a gas inlet connected to the powder supply hopper, and flying the fine powders supplied from the powder supply hopper in a first direction using gas, and the It provides a fine powder classifying apparatus including a multi-stage collector connected to a gas inlet and classifying the fine powders flying in the first direction according to a flight distance.

The powder supply hopper may include a hopper body for storing the fine powders, and a powder inlet extending from a lower portion of the hopper body in a second direction crossing the first direction and connected to a portion of the gas inlet. .

The diameter of the powder inlet may be 2mm to 20mm.

The gas inlet may include an inlet body connected to the powder supply hopper and extending in the first direction, and a gas supply unit connected to the inlet body to supply gas having a flow rate set in the first direction.

The diameter of the inlet body may be 5 mm to 100 mm.

The set flow rate of the gas supplied by the gas supply unit may be 50L/min to 1000L/min.

The multi-stage collector, a collector body communicating with the gas inlet and forming a flight space extending in the first direction, and a second body located inside the collector body, communicating with the flight space and crossing the first direction A plurality of partition walls extending in a direction to form a plurality of classification spaces disposed along the first direction may be included.

A distance between the centers of neighboring classification spaces among the plurality of classification spaces may be 20 cm to 100 cm in the first direction.

The top portions of the plurality of partition walls may be spaced from 30 cm to 100 cm in the second direction from an extension line in the first direction of the center of the gas inlet.

According to one embodiment, a fine powder classifying apparatus capable of maximizing the classification efficiency and classification processing capacity of fine powder is provided.

In addition, even if the classification processing capacity of the fine powder is increased, a fine powder classification apparatus having reduced manufacturing cost and time is provided.

1 is a perspective view showing a fine powder classifying apparatus according to an embodiment.
FIG. 2 is a longitudinal sectional view showing the fine powder classifying apparatus shown in FIG. 1.
3 is a graph showing the flight speed according to the flight time of fine powders having different particle sizes.
4 is a graph showing the flight distance according to the flight time of fine powders having different particle sizes.
5 is a table showing experimental examples of a fine powder classifying apparatus according to an embodiment.
FIG. 6 is a table showing classification results of Comparative Examples 1 to 3 and classification results of Experimental Examples 1 to 6 of the fine powder classification device according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.

Also, in the specification, when a part “includes” a certain component, this means that other components may be further included instead of excluding other components, unless otherwise stated.

Hereinafter, a fine powder classifying apparatus according to an embodiment will be described with reference to FIGS. 1 to 4.

1 is a perspective view showing a fine powder classifying apparatus according to an embodiment.

1, the fine powder classifying apparatus according to an embodiment classifies fine powders having different particle sizes according to particle sizes. The fine powder classifying apparatus includes a powder supply hopper 100, a gas inlet 200, and a multi-stage collector 300.

FIG. 2 is a longitudinal sectional view showing the fine powder classifying apparatus shown in FIG. 1.

2, the powder supply hopper 100 stores the fine powders 10 having different particle sizes, and supplies the fine powders 10 to the gas inlet 200.

The powder supply hopper 100 includes a hopper body 110 and a powder inlet 120.

The hopper body 110 stores fine powders 10. The hopper body 110 may have various shapes such as a cylindrical cylinder shape or a square pillar shape. The total amount of fine powders 10 stored in the hopper body 110 may be determined according to the size of the hopper body 110.

A moving means such as a screw for moving the fine powders 10 to the powder inlet 120 may be located inside the hopper body 110.

The powder inlet 120 extends from the lower portion of the hopper body 110 in a second direction Y intersecting the first direction X and is connected to a part of the gas inlet 200. Here, the first direction X may be perpendicular to the second direction Y, but is not limited thereto.

Between the powder inlet 120 and the hopper body 110, an opening/closing device for blocking the supply of fine powders 10 from the powder supply hopper 100 to the gas inlet 200 may be located.

The powder inlet 120 may have a cylindrical shape having a circular cross section. The feeding speed of the fine powders 10 may be determined according to the diameter of the powder inlet 120.

The diameter of the powder inlet 120 may be 2mm to 20mm.

For example, the diameter of the powder inlet 120 may be 8 mm, the hourly supply of fine powders 10 from the powder supply hopper 100 through the powder inlet 120 to the gas inlet 200 may be 150 kg/h have.

The gas inlet 200 is connected to the powder supply hopper 100, and the fine powder 10 supplied from the powder supply hopper 100 is flown in the first direction X using the gas 20.

The gas inlet 200 includes an inlet body 210 and a gas supply unit 220.

The inlet body 210 is connected to the powder inlet 120 of the powder supply hopper 100 and extends in the first direction (X).

The inlet body 210 may have a cylindrical shape extending in a first direction (X) having a circular longitudinal section. The diameter of the inlet body 210 may be 5 mm to 100 mm.

In one example, the diameter of the inlet body 210 may be 20mm to 70mm.

The gas supply unit 220 is connected to the inlet main body 210 and supplies the gas 20 having a flow rate set in the first direction X. The gas 20 supplied by the gas supply unit 220 may include air, nitrogen, argon, and the like.

The set flow rate of the gas 20 supplied by the gas supply unit 220 may be 50 L/min to 1000 L/min.

For example, the flow rate of the gas 20 supplied by the gas supply unit 220 may be 100 L/min to 600 L/min.

In order to fly the fine powders 10 supplied from the powder supply hopper 100 to the gas inlet 200 at a suitable flight distance in the first direction X, the fine powders 10 supplied to the gas inlet 200 Since the flight speed and flight distance of the fine powders 10 vary greatly depending on the density or particle size, the flow rate of the gas 20 supplied from the gas supply unit 220 can be controlled within an appropriate range to control this.

The multi-stage collector 300 is connected to the gas inlet 200 and classifies the fine powders 10 flying in the first direction X by the gas 20 from the gas inlet 200 according to the flight distance.

The multi-stage collector 300 includes a collector body 310 and a plurality of partition walls 320.

The collector body 310 communicates with the gas inlet 200 and forms a flight space FS extending in the first direction X. The fine powders 10 flying in the first direction X from the gas inlet 200 fly through the flight space FS of the collector body 310.

The plurality of partition walls 320 are located inside the collector body 310. The partition walls 320 communicate with the flight space FS to form a plurality of classification spaces CS extending in the second direction Y intersecting the first direction X. The plurality of classification spaces CS are disposed adjacent to each other along the first direction X, and the plurality of partition walls 320 divide the plurality of classification spaces CS.

The plurality of classification spaces CS divided by the plurality of partition walls 320 may include 2 to 10 along the first direction X, but is not limited thereto.

The distance L1 between the centers C1 and C2 of the neighboring classification spaces CS among the plurality of classification spaces CS may be 20 cm to 100 cm in the first direction X.

For example, the distance L1 between the centers C1 and C2 of the neighboring classification spaces CS may be 50 cm in the first direction X.

The uppermost parts of the plurality of partition walls 320 may be spaced apart with a distance L2 of 30 cm to 100 cm in the second direction Y from the extension line EL in the first direction X of the center of the gas inlet 200. have.

For example, the distance L2 between the uppermost portions of the plurality of partition walls 320 and the extension line EL in the first direction X of the center of the gas inlet 200 is 50 cm to 80 cm in the second direction Y. Can be

The fine powders 10 flying in the first space X of the flight space FS of the collector body 310 have different flight distances due to different drag forces applied according to different particle sizes, and thus have different particle sizes. Eggplant fine powder 10 is collected by falling into different classification spaces CS extending in the second direction Y according to the particle size.

3 is a graph showing the flight speed according to the flight time of fine powders having different particle sizes.

Referring to FIG. 3, it can be seen that as the particle size of the fine powder increases from 150 μm to 5 μm, it has a higher acceleration and less time to reach the maximum speed. That is, it can be seen that the smaller the particle size of the fine powder, the higher the acceleration, and the less time it takes to reach the maximum speed.

4 is a graph showing the flight distance according to the flight time of fine powders having different particle sizes.

Referring to FIG. 4, it can be seen that the total flight distance increases as the particle size of the fine powder increases from 150 μm to 5 μm. That is, it can be seen that the smaller the particle size of the fine powder, the greater the total flight distance.

Referring back to FIG. 2, the fine powders 10 have a low flight speed and a short flight distance due to a greater drag force in the flight space FS of the multi-stage collector 300 as the particle size increases, and a smaller drag force decreases as the particle size decreases. It has a high flight speed and a long flight distance.

That is, the fine powder 10 having different particle sizes flying the flight space FS of the multi-stage collector 300 from the gas inlet 200 in the first direction (X) is flying distance in order from smallest to largest. Is sequentially increased to sequentially fall into a plurality of classification spaces (CS) disposed along the first direction (X), so that the fine powders (10) having different particle sizes are multiple of the multi-stage collector (300) according to the particle size. Classified spaces (CS).

As described above, the fine powder classifying apparatus according to an embodiment, the fine powder 10 having different particle sizes by using the powder supply hopper 100 and the gas inlet 200 to fly in the first direction (X), By using the multi-stage collector 300 to classify the fine powder 10 according to the flight distance according to the particle size, it is possible to maximize the classification efficiency and the classification processing capacity of the fine powder 10.

In addition, the fine powder classifying apparatus according to an embodiment may increase the classification processing capacity of the fine powder 10 by simply increasing the size of the powder supply hopper 100 and the size of the gas inlet 200, so that the fine powder Even if the classification processing capacity of (10) is increased, manufacturing cost and manufacturing time are reduced.

Hereinafter, experimental examples in which the effect of the fine powder classifying apparatus according to an embodiment is confirmed will be described with reference to FIGS. 2, 5, and 6.

5 is a table showing experimental examples of a fine powder classifying apparatus according to an embodiment.

5 and 2, in the experimental examples and comparative examples of the fine powder classification apparatus according to an embodiment, STS316L powder prepared by an ultra high pressure water spray process was used as an initial raw material. The powder used for the evaluation was kept in an electric oven for a period of time before the experiment to completely dry the moisture.

In the experimental examples of the fine powder classifying apparatus according to an embodiment, the diameter of the powder inlet 120 located at the bottom of the powder supply hopper 100 was set to 8 mm, and at this time, the powder through the powder inlet 120 The discharge speed is about 150 kg/h.

In the experimental examples, the diameter of the inlet body 210 of the gas inlet 200 connected to the powder inlet 120 was changed to 20 mm to 70 mm.

In the experimental examples, the gas velocity according to the diameter of the inlet body 210 and the gas flow rate of the gas inlet 200 was changed.

In the experimental examples, the classifying spaces (CS) of the multi-stage collector 300 for collecting the flying powder were composed of a total of 8 stages at 50 cm intervals. The height of the bulkheads 320 of the multi-stage collector 300 was set to 50 cm or more from the extension line EL, and was set to 80 cm bottom.

In Experimental Examples 1 to 6, the diameter of the inlet body 210 of the gas inlet 200 was set to 30 mm.

In Experimental Example 1, the gas velocity was set to 2.4 m/sec according to the gas flow rate of 100 L/min.

In Experimental Example 2, the gas velocity was set to 4.7 m/sec according to the gas flow rate of 200 L/min.

In Experimental Example 3, the gas velocity was set to 7.1 m/sec according to the gas flow rate of 300 L/min.

In Experimental Example 4, the gas velocity was set to 9.4 m/sec according to the gas flow rate of 400 L/min.

In Experimental Example 5, the gas velocity was set to 11.8 m/sec according to the gas flow rate of 500 L/min.

In Experimental Example 6, the gas velocity was set to 14.1 m/sec according to the gas flow rate of 600 L/min.

In Comparative Example 1, a conventional sieve device was used.

Comparative Example 2 used a conventional Turbo Classifier (Turbo Classifier) device.

In Comparative Example 3, a conventional Cyclone Type device was used.

FIG. 6 is a table showing classification results of Comparative Examples 1 to 3 and classification results of Experimental Examples 1 to 6 of the fine powder classification device according to an embodiment.

Referring to FIG. 6, in Comparative Example 1, the classification treatment capacity was excellent, but in the case of a fine powder of 45 μm or less, classification was impossible.

Comparative Example 2 and Comparative Example 3 has a limit in increasing the classification treatment capacity, and the recovery rate of the powder also occurred compared to the input powder. In addition, looking at the results of the particle size analysis of the powder classified to 20㎛ or less, it was confirmed that the particle size control of the fine region is not completely achieved.

In contrast to Comparative Examples 1, 2, and 3, Experimental Examples 1 to 6 have a difference in the collecting position of the multi-stage collector located at the bottom because the flying distance of the powder varies depending on the gas velocity, but the particle size of the powder According to the screening operation according to the results, the particle size analysis results of powders classified to 20 μm or less showed better powder classification efficiency than that of the conventional method.

That is, as confirmed by Experimental Examples 1 to 6, the fine powder classifying apparatus according to an embodiment can maximize the classification efficiency and classification processing capacity of the fine powders, and at the same time, manufacturing cost and manufacturing time are reduced.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited to this, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

Powder supply hopper 100, gas inlet 200, multi-stage collector 300

Claims (9)

A powder supply hopper for supplying fine powders having different particle sizes;
A gas inlet connected to the powder supply hopper and flying the fine powders supplied from the powder supply hopper in a first direction using gas; And
A multi-stage collector connected to the gas inlet and classifying the fine powders flying in the first direction according to the flight distance
Fine powder classification device comprising a. In claim 1,
The powder supply hopper,
A hopper body for storing the fine powders; And
Powder inlet extending from the bottom of the hopper body in a second direction crossing the first direction and connected to a part of the gas inlet
Fine powder classification device comprising a. In claim 2,
The powder inlet has a diameter of 2mm to 20mm fine powder classification device. In claim 1,
The gas inlet,
An inlet body connected to the powder supply hopper and extending in the first direction; And
A gas supply unit connected to the main body of the inlet to supply gas having a flow rate set in the first direction
Fine powder classification device comprising a. In claim 4,
A fine powder classification device having a diameter of 5 mm to 100 mm in the main body of the inlet. In claim 4,
The set flow rate of the gas supplied from the gas supply unit is 50 L/min to 1000 L/min. In claim 1,
The multi-stage collector,
A collector body communicating with the gas inlet and forming a flight space extending in the first direction; And
Located in the collector body, a plurality of partition walls communicating with the flight space and extending in a second direction intersecting the first direction to form a plurality of classification spaces disposed along the first direction
Fine powder classification device comprising a. In claim 7,
The distance between the centers of the neighboring classification spaces among the plurality of classification spaces is a fine powder classification device of 20 cm to 100 cm in the first direction. In claim 7,
The uppermost parts of the plurality of partition walls are fine powder classifying apparatus spaced from 30 cm to 100 cm in the second direction from an extension line in the first direction of the center of the gas inlet.

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