A high efficiency powder selection device and method of use thereof

Abstract

This invention relates to a high-efficiency powder classifier, comprising a housing with a feed inlet and a powder outlet. A blower plate and an agitator are installed inside the housing. The blower plate is installed at the bottom of the housing, and the agitator is located above the blower plate, used to agitate the dust accumulated on the blower plate through friction. By agitating the dust material piled on the blower plate, large-mesh dust particles are re-floated by the airflow from the blower plate, improving powder classification efficiency and ensuring more thorough one-time powder classification. This effectively reduces the proportion of large-mesh dust in the discharged powder. Simultaneously, the agitator increases the friction between itself and the dust material, effectively grinding large dust particles. The agitator also disturbs the dust material, maintaining the flow of dust even when the blower plate is operating at low power.

Description

Technical Field

[0001] This invention relates to the field of ultrafine powder classifier technology, and in particular to a high-efficiency powder classifier and its usage method. Background Technology

[0002] Powder classifiers are mechanical devices used for classifying powders, typically in powder processing, to screen, separate, and classify powder raw materials to obtain powder products with different particle size distributions. In this industry, "mesh" is a unit representing particle size, defined as the number of openings per inch (25.4 mm) of sieve mesh. A higher mesh number indicates finer particles and smaller sieve openings. In powder preparation and processing, "mesh" is commonly used to describe the fineness of the powder. Ultrafine powders, as powder materials with special application requirements, have very high fineness requirements, therefore typically using sieves with a mesh size of 800 or higher for sieving.

[0003] To improve powder selection accuracy, the applicant previously applied for and was granted a patent (No. 202420128054.5) for a novel powder selection device. This device innovatively designed a blower plate, which, by adjusting the air pressure and speed, forms an "air film" between the blower plate surface and the dust particles. This allows the flowing sand-like material to move along the blower plate, and during this flow, small dust particles (0.035~0.075mm) are blown up, achieving high-precision powder selection and preventing the mixing of dust particles of different mesh sizes, which would otherwise require further sieving. While the applicant's current blower plate powder selection device achieves the required mesh size accuracy, its efficiency is still insufficient. Furthermore, some ultrafine powders that meet the selection criteria are not selected within the material after blower-based powder selection, requiring secondary selection, resulting in incomplete selection. Therefore, the applicant is further refining the design. Summary of the Invention

[0004] Therefore, it is necessary to provide an efficient powder classifier and its usage method to address the above problems.

[0005] A high-efficiency powder classifier includes a housing with a feed inlet and a powder outlet. A blower plate and an agitator are installed inside the housing. The blower plate is installed at the bottom of the housing, and the agitator is located above the blower plate for stirring the dust accumulated on the blower plate by friction.

[0006] Preferably, the stirrer is vertical, horizontal, or inclined.

[0007] Preferably, the agitator includes a mounting frame, a main motor, several agitator blades and a rotating shaft. The main motor is mounted outside the housing, the rotating shaft passes through the housing via bearings, the output end of the main motor is connected to the upper end of the rotating shaft, the mounting frame is connected to the rotating shaft, and several agitator blades are mounted on the mounting frame.

[0008] Preferably, the blower plate includes a plate body and a plurality of blower caps, the plurality of blower caps are vertically mounted on the plate body, the blower caps are connected to the hollow plate body, the side walls of the blower caps are provided with a plurality of air outlet holes, and the outer wall of the blower caps is provided with a wear-resistant rough coating.

[0009] Preferably, the stirring blade is rod-shaped or spiral-shaped.

[0010] Preferably, a fabric feeder is provided at the bottom of the box, and the fabric feeder is connected to the box.

[0011] Preferably, the material feeder includes a plurality of discharge pipes and air outlet pipes, the upper end of the plurality of discharge pipes and air outlet pipes having a height higher than the upper surface of the blower plate, the upper end of the plurality of discharge pipes having unequal heights, and the upper end of the air outlet pipe having a height higher than the discharge pipes.

[0012] Preferably, the material distributor is tower-shaped, and several discharge pipes are arranged around the air outlet pipe, with the height of the upper end of the discharge pipe gradually increasing towards the air outlet pipe.

[0013] Preferably, the material feeder is in the shape of an oblique triangle, and the plurality of discharge pipes are arranged in a stepped manner, with the height of the upper end of the pipe gradually increasing towards the air outlet pipe.

[0014] A method for using a high-efficiency air classifier includes the following steps: S1, add the powder to be selected into the box through the feed inlet; S2, start the blower plate to blow air into the chamber for powder selection; S3, start the mixer to stir the powder accumulated on the blower plate; S4, the stirring rate of the agitator is adjusted according to the air volume of the blower plate. If the air volume of the blower plate increases, the stirring rate of the agitator decreases; if the air volume of the blower plate decreases, the stirring rate of the agitator increases.

[0015] The advantages of this invention are: by using an agitator to stir the dust material piled on the blower plate, the large-mesh dust is re-floated under the action of the airflow of the blower plate, which improves the powder selection efficiency, makes the powder selection more thorough in one go, and effectively reduces the proportion of large-mesh dust in the discharged powder. At the same time, the agitator can also increase the friction between the agitator and the material dust, which can grind large particles of dust. The agitator can disturb the material dust and maintain the flow of material dust when the blower plate is running at low power. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a high-efficiency powder classifier in one embodiment; Figure 2This is a schematic diagram of a high-efficiency powder classifier according to another embodiment. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] like Figures 1-2As shown, a high-efficiency powder classifier includes a housing 1, with an inlet 11 and an outlet 12. An air blower 2 and a stirrer 3 are installed inside the housing 1. The air blower 2 is installed at the bottom of the housing 1, and the stirrer 3 is located above the air blower 2, used to stir and agitate the dust accumulated on the air blower 2. Specifically, during powder classification, the user pours the raw material into the housing 1 through the inlet 11. The external blower is connected to the air blower 2, which blows out several tiny airflows. For the specific design of the air blower 2, please refer to application numbers CN202420128054 and 2025203319101; one is a flat plate blower, and the other is an air-film bladder blower, both of which can achieve ultra-fine powder classification. The powder after classification accumulates on the air blower 2. It is understandable that during powder selection, some ultrafine powder that meets the mesh size standard will mix with other smaller mesh dust and accumulate on the blower plate 2. The existing method is to simply wait for it to be discharged after the powder selection is completed, which leads to low powder selection efficiency and incomplete powder selection. Based on the existing technical solution, this solution adds a stirrer 3 to stir the material accumulated on the blower plate 2. Together with the airflow blown out by the blower plate 2, it disperses dust in the housing 1, making it easier for the ultrafine powder that meets the standard to float up and overflow from the powder outlet 12 along the blowing direction of the blower plate 2. This effectively improves the powder selection efficiency and makes the powder selection more thorough. Meanwhile, when the blower plate 2 operates at low power, i.e., the blown airflow is in a low-speed, low-pressure state, the material dust easily stagnates on the blower plate 2, lacking fluidity. The presence of the agitator 3 can disturb the powder accumulated on the blower plate 2, causing it to "flow" again on the blower plate 2. By adjusting the power of the agitator 3, precise powder control can be achieved, completely controlling the flow rate of the powder on the blower plate, making the adjustment of the powder flow rate more convenient and quick. At the same time, when the agitator 3 is agitating, the blades of the agitator 3 come into contact with the material dust, increasing the friction between the two, grinding the particles in the powder, and friction shaping, which can effectively grind and cut larger particles in the material into smaller particles. The agitator 3 is installed in the housing 1, and its shape is not specifically limited. It can be installed vertically, horizontally, or directly at an angle. The number of agitators 3 in one housing 1 is also not specifically limited, as long as it can agitate the material dust. The agitator blades are also not fixed, and the number, angle, area, and shape of the blades can be set according to the powder agitation requirements.

[0021] like Figure 1As shown in Figure 3, the agitator 3 includes a mounting frame 31, a main motor 32, several agitator blades 33, and a rotating shaft 34. The main motor 32 is mounted outside the housing 1, and the rotating shaft 34 passes through the housing 1 via bearings. The output end of the main motor 32 is connected to the upper end of the rotating shaft 34. The mounting frame 31 is connected to the rotating shaft 34, and several agitator blades 33 are mounted on the mounting frame 31. Specifically, because this technical solution belongs to the field of ultrafine powder selection, in order to avoid dust affecting the motor's state, this solution places the main motor 32 outside the housing 1. The main motor 32 drives the mounting frame 31 to rotate inside the housing 1 via the rotating shaft 34, which in turn drives the agitator blades 33 connected to the mounting frame 31 to rotate. This causes the dust material piled up inside the housing 1 to float again under the action of airflow, resulting in higher powder selection efficiency. At the same time, the friction between the agitator blades 33 and the dust material effectively breaks up large dust particles. Simultaneously, the agitation effectively disturbs the dust, preventing it from stagnating on the blower plate. This results in a larger amount of ultrafine powder being obtained from the raw material at one time, and the powder selection is more thorough. Furthermore, the stirring blade 33 can be rod-shaped, blade-shaped, or spiral-shaped, etc., without being specifically limited here.

[0022] like Figures 1-2 As shown, the blower plate 2 includes a plate body 21 and several air caps 22. The air caps 22 are vertically mounted on the plate body 21 and are connected to the hollow plate body 21. Several air outlet holes are opened on the side wall of the air caps 22, and the outer wall of the air caps 22 is provided with a wear-resistant rough coating. Specifically, the external blower introduces gas into the hollow plate body 21, and then through several parallel and spaced air caps 22, it is divided into several tiny airflows that enter the housing 1, causing the powder accumulated on the blower plate 2 to "bubble," thereby selecting out small dust particles. The wind cap 22 in this design is elongated, and its cross-section can be a square tube, a round tube, or other shapes. To avoid the top of the wind cap 22 colliding with the stirring blade 33, the wind cap 22 and the stirring blade 33 are designed to be staggered. When the stirring blade 33 is stirring the powder, the powder is always in a flowing state, which causes the powder to rub against the outer wall of the wind cap 22. This mimics the principle of river erosion friction. The rough coating on the outer wall of the wind cap 22 is used to polish the dust particles, making the particle shape in the dust more in line with product standards, in order to exceed the quality of natural sand.

[0023] like Figures 1-2 As shown, a material feeder 4 is provided at the bottom of the box 1. The material feeder 4 is connected to the box 1. The material feeder 4 is used to discharge the material that has been selected and piled on the surface of the blower plate 2. The material can be crushed again and then recycled into the box 1 for selection again, thereby reducing material costs.

[0024] like Figures 1-2As shown, the material distributor 4 includes several discharge pipes 41 and air outlet pipes 42. The height of the upper openings of the discharge pipes 41 and air outlet pipes 42 is higher than the upper surface of the blower plate 2. The heights of the upper openings of the discharge pipes 41 are unequal, and the height of the upper opening of the air outlet pipe 42 is higher than the height of the discharge pipes 41. Specifically, it can be understood that after the powder is separated by the blower, the separated material is piled up on the blower plate 2 in a quicksand-like manner. After piling up to a certain height, the material flows out from the discharge pipes 41 of the material distributor 4 in a distributed manner. One discharge pipe 41 is connected to one screening machine. The discharge pipes 41 of different heights meet the material piling height, avoiding the situation where a single discharge pipe 41 is not discharging in time or piling up too high. The material discharged from the discharge pipes 41 of the same height is sufficient to meet the full-load screening requirements of one screening machine. This design also includes an exhaust pipe 42, which is the tallest part of the design. This prevents the powder from leaking out of the exhaust pipe 42. Since the blower plate 2 continuously introduces gas into the housing 1, which is a sealed space, the continuous introduction of gas maintains a high pressure inside the housing 1. The function of the exhaust pipe 42 is to exhaust the gas and maintain the pressure balance inside the housing 1.

[0025] like Figure 2 As shown, the material distributor 4 is tower-shaped, with several discharge pipes 41 arranged around the air outlet pipe 42. The height of the upper opening of each discharge pipe 41 increases progressively towards the air outlet pipe 42. Specifically, several discharge pipes 41 with the same upper opening height are arranged in a ring, and the height of the discharge pipes 41 gradually increases towards the central air outlet pipe 42, with the highest and centrally located air outlet pipe 42. This ensures that the discharge pipes 41 can smoothly discharge large particles of powder accumulated on the blower plate 2. The tower-shaped material distributor 4 is conveniently positioned in the middle of the blower plate 2.

[0026] like Figure 1 As shown, the material distributor 4 is a slanted triangle, and several discharge pipes 41 are arranged in a stepped manner, with the height of their upper pipe openings gradually increasing towards the air outlet pipe 42. Specifically, the material distributor 4 is designed as a slanted triangle to facilitate its placement at the corner of the blower plate 2. Several discharge pipes 41 with the same upper port height are arranged side by side, and then the pipe openings of the discharge pipes 41 gradually increase in height, culminating in the air outlet pipe 42 at the highest point. The triangular shape of the material distributor 4 makes it convenient to place it at the corner of the housing 1.

[0027] A method for using a high-efficiency air classifier includes the following steps: S1, the powder to be selected is added into the box through the feed inlet. Specifically, after the powder is introduced through the feed inlet 11, the valve in the feed inlet 11 is closed and the valve in the discharge outlet 12 is opened, so that the selected dust can enter the collector through the discharge outlet 12.

[0028] S2, activate the blower plate to blow air into the chamber for powder separation. Specifically, the blower is connected to the blower plate, and the airflow is divided into several micro-airflows by the blower plate before entering the chamber to separate the powder deposited on the blower plate, causing small dust particles to float up.

[0029] S3, start the agitator to stir the powder accumulated on the blower plate. Specifically, the agitator increases the fluidity of the powder deposited on the blower plate, and the stirring of the powder makes it easier for small dust particles to be blown away by the airflow from the blower plate, achieving complete powder selection in one go.

[0030] S4, the stirring rate of the agitator is adjusted according to the air volume of the blower plate. If the air volume of the blower plate increases, the stirring rate of the agitator decreases; if the air volume of the blower plate decreases, the stirring rate of the agitator increases. Specifically, by using the blower plate and the agitator in combination, the flow rate of dust deposited on the blower plate and the dust discharge efficiency are controlled. Compared with the previous method of controlling the flow rate solely through the blower plate, the control accuracy is higher.

[0031] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-efficiency powder classifier, characterized in that: The device includes a housing with a feed inlet and a powder outlet. Inside the housing are a blower plate and a stirrer. The blower plate is installed at the bottom of the housing, and the stirrer is located above the blower plate to agitate dust accumulated on it. The stirrer includes a mounting frame, a main motor, several stirring blades, and a rotating shaft. The main motor is installed outside the housing, and the rotating shaft passes through the housing via bearings. The output end of the main motor is connected to the upper end of the rotating shaft. The mounting frame is connected to the rotating shaft, and several stirring blades are mounted on the mounting frame. The blower plate includes a plate body and several air caps. Several air caps are vertically mounted on the plate body and communicate with the hollow plate body. Several air outlets are provided on the side walls of the air caps. The outer wall of the blower cap is provided with a wear-resistant, rough coating for grinding dust particles. The stirring blades are rod-shaped or rotary-shaped. A material distributor is provided at the bottom of the housing, and the material distributor is connected to the housing. The material distributor includes several discharge pipes and air outlet pipes. The height of the upper openings of the discharge pipes and air outlet pipes is higher than the upper surface of the blower plate. The heights of the upper openings of the discharge pipes are unequal, and the height of the upper opening of the air outlet pipes is higher than the height of the discharge pipe openings. The stirring speed of the agitator is adjusted according to the air volume of the blower plate. If the air volume of the blower plate increases, the stirring speed of the agitator decreases; if the air volume of the blower plate decreases, the stirring speed of the agitator increases.

2. The high-efficiency powder classifier as described in claim 1, characterized in that: The stirrer can be vertical, horizontal, or tilted.

3. The high-efficiency powder classifier as described in claim 1, characterized in that: The material distributor is tower-shaped, and several discharge pipes are arranged around the air outlet pipe. The height of the upper end of the discharge pipe increases gradually towards the air outlet pipe.

4. The high-efficiency powder classifier as described in claim 1, characterized in that: The material feeder is triangular in shape, and the discharge pipes are arranged in a stepped manner, with the height of the upper pipe openings gradually increasing towards the air outlet pipe.

5. The method of using a high-efficiency air classifier as described in any one of claims 1 to 4, characterized in that: Includes the following steps, S1, add the powder to be selected into the box through the feed inlet; S2, activate the blower plate to blow air into the chamber for powder selection; S3, start the mixer to stir the powder accumulated on the blower plate; S4, the stirring rate of the agitator is adjusted according to the air volume of the blower plate. If the air volume of the blower plate increases, the stirring rate of the agitator decreases; if the air volume of the blower plate decreases, the stirring rate of the agitator increases.

Images