A multi-stage screening and collecting device for superfine atomized powder

Abstract

The utility model discloses a kind of multi-stage screening and collecting devices of superfine atomization powder making, including bottom support by utilizing multiple groups of steel pipe welding, still include: multistage screening cylinder, by several different mesh screen welding is made, outside welding has the outer rib rack of supporting this multistage screening cylinder, wherein the mesh number of screen gradually increases from back to front, discharge hopper, welding in bottom support top, and with the different mesh number of multistage screening cylinder adaptive arrangement, inclined frame, by several steel pipe welding formation and fixedly connected in bottom support top, for carrying multistage screening cylinder, the inclined frame is inclined to rear side.The utility model is formed by double airflow symmetrical convergence and forms the effect of counter shearing, in combination with the periodic transient impact of pulse type high pressure airflow, high efficiency break up powder agglomeration, wherein the shear force and turbulent collision force of airflow convergence generation destroy the adhesion force inside agglomeration, the pressure mutation of pulse airflow further crushes stubborn agglomeration, significantly improves powder dispersion uniformity.

Description

Technical Field

[0001] This utility model relates to the field of ultrafine atomization powder production technology, and in particular to a multi-stage sieving and collection device for ultrafine atomization powder production. Background Technology

[0002] The core principle of ultrafine atomization powder production is to use energy carriers such as high-pressure airflow, centrifugal force, or plasma to break molten metal, ceramic, or polymer materials into tiny droplets. The droplets then rapidly solidify in a cooling medium, ultimately forming ultrafine powder with particle sizes typically ranging from micrometers to submicrometers. This process is widely used in aerospace, electronics, high-end manufacturing, and biomedicine due to its advantages such as precise control of powder particle size, high purity, and good sphericity. However, because the prepared powder has extremely small particle size, a significantly increased specific surface area, and a markedly enhanced surface energy, the powder particles are easily attracted to each other by van der Waals forces, electrostatic forces, and intermolecular adsorption. At the same time, slight adhesion may occur during the cooling process of the atomized droplets, and the powder may collide and aggregate during the conveying and sieving stages, leading to a high likelihood of clumping in the ultrafine powder.

[0003] Powder agglomeration can cause a series of serious problems: On the one hand, agglomerated powder can lead to the failure of sieving and grading, with coarse and fine powders mixed together, making it impossible to obtain qualified products with uniform particle size. This directly affects the quality of subsequent processing steps such as molding and sintering, reducing the performance stability of the final product. On the other hand, agglomerated powder easily clogs screen pores, pipelines, and equipment feed inlets, causing production interruptions and requiring frequent shutdowns for cleaning, significantly reducing production efficiency and increasing maintenance costs. Breaking agglomerates is extremely difficult, mainly because ultrafine powder agglomeration is not just simple physical aggregation, but also involves weak chemical bonds and adhesion on the particle surface. The mechanical sieving force of the rotating screen cylinder has limited energy transfer and cannot break the internal structure of stubborn agglomerates. Traditional agglomeration breaking devices often use additional crushing mechanisms, which are not only complex and energy-intensive, but also prone to secondary powder contamination. Furthermore, they have poor coordination with the sieving process, making it difficult to simultaneously achieve efficient agglomeration breaking during sieving, and failing to fundamentally solve the impact of agglomeration on the post-processing of ultrafine atomized powder. Based on the above viewpoints, those skilled in the art have proposed a multi-stage sieving and collection device for ultrafine atomized powder production. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage sieving and collecting device for ultra-fine atomized powder production. This device utilizes the symmetrical convergence of two airflows to create a counter-shearing effect, combined with the periodic instantaneous impact of pulsed high-pressure airflow, to efficiently break up powder agglomerates. The shearing force and turbulent collision force generated by the convergence of airflows destroy the internal adhesion of the agglomerates, and the pressure change of the pulsed airflow further breaks up stubborn agglomerates, significantly improving the uniformity of powder dispersion.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage sieving and collecting device for ultrafine atomized powder production includes a bottom support made of multiple sets of welded steel pipes, and further includes: The multi-stage screening cylinder is made of several screens with different mesh sizes welded together. The outer side is welded with an outer rib frame to support the multi-stage screening cylinder. The mesh number of the screens gradually increases from the inlet to the outlet. The discharge hopper is welded to the top of the bottom support and is arranged to match the different mesh counts of the multi-stage screen cylinder; The inclined frame, formed by welding several steel pipes and fixed to the top of the bottom support, is used to support the multi-stage screen cylinder. The inclined frame is tilted to the rear. Two sets of drive mechanisms are installed on the left and right sides of the inclined frame, respectively, to drive the multi-stage screen cylinder to rotate; The pulse airflow assembly is fixed to the front and rear side walls of the inclined frame and penetrates the inside of the multi-stage screening cylinder. The pulse airflow assembly includes a front fixed bracket and a rear fixed bracket fixed to the front and rear sides of the inclined frame. An exhaust pipe is fixedly connected between the two. The exhaust pipe is provided with several air distribution grooves for introducing airflow into the bottom of the multi-stage screening cylinder.

[0006] Preferably, the front side wall of the exhaust pipe is equipped with an air valve for connecting to an external air source, and the air outlet of the air valve is interconnected with several air distribution channels.

[0007] Preferably, the front end of the multi-stage screening cylinder is fixedly connected with crown teeth, and a push rod is connected to the front fixed bracket by a spring. The push rod is made of wear-resistant structure and is adapted to the crown teeth. An air baffle is slidably fitted inside the exhaust pipe. A groove is provided inside the air baffle for connecting the air distribution groove.

[0008] Preferably, the drive mechanism includes: The drive motor is mounted on the side steel tube of the tilting frame; Several drive pulleys are installed on the side wing steel pipes of the inclined frame. The centers of the several drive pulleys on the same side are coaxial and abut against the outer wall of the annular steel of the multi-stage screen cylinder outer rib frame. A drive shaft, fixed to the axis of several drive pulleys, is used to connect drive pulleys on the same side; The connecting component connects the output end of the drive motor to the drive shaft to drive the drive shaft to rotate.

[0009] Preferably, the connecting assembly includes belt teeth respectively installed on the movable end of the drive motor and fixed to the outer wall of the drive shaft, and a belt sleeved on the outside of the two belt teeth.

[0010] Preferably, front guide rollers are installed on both sides of the longitudinally extending support of the front side wall of the inclined frame, which abut against the front side wall of the multi-stage screen cylinder.

[0011] This utility model has the following beneficial effects: 1. In this utility model, the opposing shear effect is formed by the symmetrical convergence of two airflows, combined with the periodic instantaneous impact of pulsed high-pressure airflow, which effectively breaks up powder agglomerates. The shear force and turbulent collision force generated by the convergence of airflow destroy the adhesion force inside the agglomerates, and the pressure change of the pulsed airflow further breaks up stubborn agglomerates, significantly improving the uniformity of powder dispersion.

[0012] 2. In this utility model, the rotation of the screen cylinder and the pulsed airflow work together, and the crown teeth work with the baffle plate to realize the pulsed airflow, which does not require an additional power source and reduces energy consumption; the airflow not only breaks up the agglomerates, but also blows away the powder adhering to the inner wall of the screen, effectively preventing screen blockage and ensuring continuous screening. Attached Figure Description

[0013] Figure 1 This is a perspective view of a multi-stage sieving and collecting device for ultrafine atomized powder production proposed in this utility model. Figure 2 This is a partial schematic diagram of the drive mechanism in a multi-stage sieving and collecting device for ultrafine atomized powder production proposed in this utility model. Figure 3 This is a partial schematic diagram of the front part of a multi-stage sieving and collecting device for ultra-fine atomized powder production proposed in this utility model. Figure 4 This is a schematic diagram of the pulse airflow component in a multi-stage sieving and collecting device for ultrafine atomized powder production proposed in this utility model. Figure 5 This is a partial structural diagram of the pulse airflow component in a multi-stage sieving and collecting device for ultrafine atomized powder production proposed in this utility model. Figure 6 This is a schematic diagram showing the cooperation between the crown protrusions, push rod, and air baffle in a multi-stage sieving and collecting device for ultra-fine atomized powder production proposed in this utility model.

[0014] Legend: 1. Bottom support; 2. Discharge hopper; 3. Drive mechanism; 4. Multi-stage screening cylinder; 5. Inclined frame; 6. Pulse airflow assembly; 7. Front guide roller; 8. Crown teeth; 32. Drive motor; 33. Drive shaft; 34. Connecting assembly; 35. Drive pulley; 61. Rear fixed bracket; 62. Exhaust duct; 63. Front fixed bracket; 64. Air valve; 65. Air distribution channel; 66. Air baffle; 67. Push rod. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Reference Figure 1-6 This utility model provides an embodiment of a multi-stage sieving and collecting device for ultra-fine atomized powder production, comprising a bottom support 1 welded from multiple sets of steel pipes, and further comprising: a multi-stage sieve cylinder 4, made of several sieves with different mesh sizes welded together, with an outer rib frame welded to the outside to support the multi-stage sieve cylinder 4, wherein the mesh size of the sieves gradually increases from the inlet to the outlet; a discharge hopper 2, welded to the top of the bottom support 1 and arranged to match the different mesh sizes of the multi-stage sieve cylinder 4; and an inclined frame 5, formed by welding several steel pipes and fixed to the bottom support. 1. The top is used to support the multi-stage screening cylinder 4. The tilting frame 5 tilts to the rear. Two sets of drive mechanisms 3 are respectively installed on the steel pipes on the left and right sides of the tilting frame 5 to drive the multi-stage screening cylinder 4 to rotate. The pulse airflow assembly 6 is fixed to the front and rear side walls of the tilting frame 5 and penetrates the inside of the multi-stage screening cylinder 4. The pulse airflow assembly 6 includes a front fixed bracket 63 and a rear fixed bracket 61 fixed to the front and rear sides of the tilting frame 5. An exhaust pipe 62 is fixedly connected between the two. The exhaust pipe 62 is provided with an air distribution groove 65 for introducing airflow into the bottom of the multi-stage screening cylinder 4.

[0017] It should be noted that the powder generated by ultrafine atomization is fed into the rear of the multi-stage sieve cylinder 4. Since the multi-stage sieve cylinder 4 is arranged at an incline, the powder slides downward under the action of gravity. The drive mechanism 3 drives the multi-stage sieve cylinder 4 to rotate, thereby separating the powder of different fineness and collecting it through the discharge hopper 2. In order to avoid the powder from clumping and affecting the sieving effect, a strong airflow is introduced through the exhaust pipe 62. The airflow forms two sets of directional airflows with symmetrical angles through the air distribution groove 65.

[0018] The front wall of the exhaust pipe 62 is equipped with an air valve 64 for connecting to an external air source. The air outlet of the air valve 64 is connected to several air distribution channels 65. The front end of the multi-stage screening cylinder 4 is fixedly connected with a crown tooth 8. A push rod 67 is connected to the front fixed bracket 63 by a spring. The push rod 67 is made of wear-resistant structure and is adapted to the crown tooth 8. An air baffle 66 is slidably fitted inside the exhaust pipe 62. A groove is provided inside the air baffle 66, which is used to connect the air distribution channels 65.

[0019] It should be noted that when the multi-stage sieve cylinder 4 rotates, the protrusions of its crown teeth 8 continuously drive the push rod 67 to extend and retract back and forth, thereby driving the baffle plate 66 to slide back and forth inside the exhaust pipe 62, so that the air distribution groove 65 forms intermittent ventilation, and finally blows out pulsed high-pressure air. The pulsed airflow forms periodic instantaneous high-pressure impact. Compared with continuous airflow, the impact force generated by its pressure change is more likely to break through the agglomeration adhesion of the powder. Combined with the shearing and collision effect formed by the convergence of the two airflows, it can more efficiently break the stubborn agglomerates into fine powder, further improving the uniformity of powder dispersion.

[0020] The drive mechanism 3 includes: a drive motor 31, mounted on the side steel pipe of the inclined frame 5 via a motor bracket; several drive pulleys 34, mounted on the side steel pipe of the inclined frame 5, with the centers of the several drive pulleys 34 on the same side being coaxial and abutting against the outer wall of the annular steel of the outer rib of the multi-stage screen cylinder 4; a drive shaft 32, fixed to the axis of the several drive pulleys 34, used to connect the drive pulleys 34 on the same side; and a connecting assembly 33, connecting the output end of the drive motor 31 and the drive shaft 32 to drive the drive shaft 32 to rotate. The connecting assembly 33 includes belt teeth respectively mounted on the movable end of the drive motor 31 and fixed to the outer wall of the drive shaft 32, and a belt sleeved on the two belt teeth. The drive motor 31 drives the belt teeth at its movable end to further drive the drive shaft 32 to rotate, thereby driving the several drive pulleys 34 to rotate simultaneously. When the several drive pulleys 34 rotate synchronously, they will further drive the multi-stage screen cylinder 4 abutting against the drive pulleys 34 to rotate.

[0021] The front guide rollers 7 are installed on both sides of the longitudinally extending support on the front side wall of the tilting frame 5. They abut against the front side wall of the multi-stage screen cylinder 4 and are used to limit and guide the front part of the tilting frame 5.

[0022] Working principle: The powder generated by ultrafine atomization is fed into the rear of the multi-stage sieve cylinder 4. Since the multi-stage sieve cylinder 4 is inclined, the powder slides downward under the action of gravity. At the same time, the drive motor 31 drives the belt teeth at its movable end to further drive the drive shaft 32 to rotate, which in turn drives several drive pulleys 34 to rotate simultaneously. When the drive pulleys 34 rotate synchronously, they further drive the multi-stage sieve cylinder 4, which is abutting against the drive pulleys 34, to rotate. The drive mechanism 3 drives the multi-stage sieve cylinder 4 to rotate, thereby screening out powders of different fineness and collecting them through the discharge hopper 2. To avoid powder agglomeration affecting the screening effect, a strong airflow is introduced through the exhaust pipe 62. The airflow forms two sets of directional airflows with symmetrical angles through the air distribution groove 65. These two sets of airflows are sprayed radially opposite each other along the bottom of the multi-stage sieve cylinder 4, forming a counter-convergence effect in the powder flow area at the bottom of the sieve cylinder. When the two airflows collide and converge, on the one hand, the high-intensity shear force generated by the airflow velocity difference is used to remove the agglomerated powder. Instead of forming a cutting-type dispersion, the converged airflow creates a local turbulent field. The kinetic energy carried by the airflow is transferred to the agglomerated particles through collisions, which destroys the adhesion within the agglomerated particles and crushes large agglomerated particles into fine powder that meets the sieving requirements. At the same time, the converged airflow can also sweep away the powder adhering to the inner wall of the screen cylinder and the surface of the screen mesh, further preventing agglomeration and ensuring that powders of different fineness can be accurately sieved and collected through the discharge hopper 2. When the multi-stage screen cylinder 4 rotates, the protrusions of its crown teeth 8 continuously drive the push rod 67 to extend and retract back and forth, thereby driving the baffle plate 66 to slide back and forth inside the exhaust pipe 62, so that the air distribution groove 65 forms intermittent ventilation, and finally blows out pulsed high-pressure air. The pulsed airflow forms periodic instantaneous high-pressure impacts. Compared with continuous airflow, the impact force generated by its pressure change is more likely to break through the agglomerated adhesion of the powder. Combined with the shearing and collision effect formed by the convergence of the two airflows, it can more efficiently break stubborn agglomerated particles into fine powder, further improving the uniformity of powder dispersion.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage sieving and collecting device for ultrafine atomized powder production, comprising a bottom support (1) welded from multiple sets of steel pipes, characterized in that: Also includes: The multi-stage screening cylinder (4) is made of several screens with different mesh sizes welded together. The outer side is welded with an outer rib frame to support the multi-stage screening cylinder (4). The mesh size of the screens gradually increases from the inlet to the outlet. The discharge hopper (2) is welded to the top of the bottom support (1) and is arranged to match the different mesh numbers of the multi-stage screen cylinder (4); The inclined frame (5) is formed by welding several steel pipes and fixed to the top of the bottom support (1) for supporting the multi-stage screen cylinder (4). The inclined frame (5) is inclined to the rear. Two sets of drive mechanisms (3) are respectively installed on the inclined frame (5) to drive the multi-stage screen cylinder (4) to rotate; The pulse airflow assembly (6) is fixed to the front and rear side walls of the inclined frame (5) and penetrates the interior of the multi-stage screening cylinder (4). The pulse airflow assembly (6) includes a front fixed bracket (63) and a rear fixed bracket (61) fixed to the front and rear sides of the inclined frame (5). An exhaust pipe (62) is fixedly connected between the two. An air distribution groove (65) is provided in the exhaust pipe (62) for introducing airflow into the bottom of the multi-stage screening cylinder (4).

2. The multi-stage sieving and collecting device for ultrafine atomized powder production according to claim 1, characterized in that: The front wall of the exhaust pipe (62) is equipped with an air valve (64) for connecting with an external air source, and the air outlet of the air valve (64) is connected to several air distribution channels (65).

3. The multi-stage sieving and collecting device for ultrafine atomized powder production according to claim 1, characterized in that: The front end of the multi-stage screening cylinder (4) is fixedly connected with crown teeth (8), and a push rod (67) is connected to the front fixed bracket (63) by a spring. The push rod (67) is made of wear-resistant structure and is adapted to the crown teeth (8). A baffle plate (66) is slidably fitted inside the exhaust pipe (62). A groove is provided inside the baffle plate (66) for connecting the air distribution groove (65).

4. The multi-stage sieving and collecting device for ultrafine atomized powder production according to claim 1, characterized in that: The drive mechanism (3) includes: Drive motor (31) is mounted on the side steel tube of the tilting frame (5); Several drive pulleys (34) are installed on the side wing steel pipe of the inclined frame (5). The centers of the several drive pulleys (34) on the same side are coaxial and abut against the outer wall of the annular steel of the outer rib of the multi-stage screen cylinder (4). The drive shaft (32) is fixed to the axis of several drive pulleys (34) and is used to connect the drive pulleys (34) on the same side. The connecting component (33) connects the output end of the drive motor (31) to the drive shaft (32) to drive the drive shaft (32) to rotate.

5. The multi-stage sieving and collecting device for ultrafine atomized powder production according to claim 4, characterized in that: The connecting assembly (33) includes belt teeth respectively installed on the movable end of the drive motor (31) and fixed to the outer wall of the drive shaft (32), and a belt sleeved on the outside of the two belt teeth.

6. The multi-stage sieving and collecting device for ultrafine atomized powder production according to claim 1, characterized in that: The inclined frame (5) has front guide rollers (7) installed on both sides of the longitudinally extending support on the front side wall, which abut against the front side wall of the multi-stage screen cylinder (4).

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