Cyclone device for grading superfine powder

Abstract

A cyclone device for classifying superfine powder relates to the technical field of classifiers and comprises a cyclone cone and an ash bin which are arranged from top to bottom, a secondary air device is arranged between the cyclone cone and the ash bin and comprises an air inlet cavity shell, and a lower port wrapping the cyclone cone and an air distribution barrel of an upper port of the ash bin are arranged in the air inlet cavity shell. And air distribution holes are uniformly distributed in the peripheral wall of the air distribution barrel. The secondary air supply device solves the problems that a secondary air device in the prior art cannot freely adjust the air supply amount, inlet air cannot uniformly act on materials, control over the particle size distribution range of collected objects is reduced, and high-quality products cannot be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of classifiers, in particular to a cyclone device used for classifying ultrafine powders. Background Art

[0002] The cyclone classifier is a widely used separation equipment in industry. Its working principle is: when the dust-laden gas enters the outer cylinder from the air inlet at a high speed along the tangent direction of the outer cylinder, a rotation motion is formed. Due to the restrictions of the inner and outer cylinders and the top cover, the airflow is forced to rotate from top to bottom in a spiral line, which is called an external cyclone. During the rotation of the dust-laden airflow, a large centrifugal force is generated. Since the inertia force of solid dust particles is much greater than that of the gas, they are thrown to the cylinder wall and lose energy and slide down along the wall, gradually separating from the airflow, forming a particle concentration area at the lower part of the outer cylinder wall, and entering the ash storage box through the ash discharge port. When the rotating and descending external cyclone moves downward along the cone, it moves closer to the center of the dust collector as the cone shrinks, and the rotating airflow enters the radius range of the exhaust pipe. Due to the sealed state below, the airflow is forced to start rotating and rising, forming a spiral line motion airflow from bottom to top, called an internal cyclone, also known as a core flow, and finally the purified gas is discharged outward through the exhaust pipe. However, in actual use, especially in the application of lithium battery negative electrode materials industry, due to the viscosity and collision movement of the particles, coarse particles will carry some ultrafine particles into the lower part to be collected. This results in some particles in the collected sinking particles still not meeting the requirements, and even after normal adjustment of the various parameters of the classifier, they still cannot be separated from the target material.

[0003] It should also be noted that in order to improve the collection efficiency of the cyclone collector, there must be no air leakage points. Therefore, no matter where the air supply duct is added, it will inevitably cause a certain degree of reduction in the collection efficiency of the cyclone collector. However, in the lithium battery negative electrode material industry with high quality requirements, in order to collect high-quality target products, a certain degree of reduction in collection efficiency is acceptable.

[0004] According to the previous description, the particles collected by the collector itself contain some ultra-fine unqualified particles. If we can reasonably increase the air supply duct, we can separate these unqualified particles. From this perspective, the collection efficiency is improved.

[0005] The prior art discloses a CN219210294U, which discloses a cyclone classifier with a secondary particle classification function, including an upper body, a cone connected to the lower end of the upper body, and a secondary air inlet device connected to the lower end of the cone; the lower end of the secondary air inlet device is connected to a collection bin; the secondary air inlet device includes a spiral shell, the spiral form of the spiral shell is a plane spiral, and the spiral shell spirals one circle; the spiral shell spiral inner end and outer end are tangentially provided with secondary air inlets, and the secondary air inlets are connected to the inner cavity of the spiral shell; the spiral shell is provided with a plurality of guide blades, and the plurality of guide blades are evenly spaced along the central circumference of the spiral shell, which can collect particles with a narrower particle size distribution range without destroying the original spiral airflow, and obtain high-quality products. However, the air supply volume of the above-mentioned secondary air device is determined by the air volume of the air supply duct, and the air supply volume cannot be freely adjusted. Too much or too little air supply volume will affect the classification effect, and even worse, the function of the entire cyclone classifier may be greatly reduced.

[0006] The prior art also discloses a CN202410854U, which includes a cylinder, a cyclone inlet and an air outlet are provided on the upper part of the cylinder, a cone is provided at the bottom of the cylinder, a flow stabilizer is provided at the bottom of the cone, an air inlet chamber connected to the flow stabilizer is provided outside the flow stabilizer, a cyclone regulating valve is provided on the air inlet chamber, and a discharge valve is provided at the bottom of the flow stabilizer. When working, the cyclone regulating valve is adjusted to adjust the size of the bottom air inlet, the air inlet chamber is connected to the flow stabilizer, and the bottom air enters the cone through the flow stabilizer. The setting of the bottom air can reduce the number of particles contained in the finished product, improve the grading efficiency, and ensure uniform grading.

[0007] As the existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, which are mainly manifested in the following aspects:

[0008] The existing secondary air device cannot freely adjust the amount of air supply, and the incoming air cannot act evenly on the material, which reduces the control over the particle size distribution range of the collected material and makes it impossible to obtain high-quality products.

[0009] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0010] In view of the defects in the prior art, the utility model solves the problems that the secondary air device in the traditional technology cannot freely adjust the amount of air supply, and the incoming air cannot act evenly on the material, which reduces the control over the particle size distribution range of the collected material and makes it impossible to obtain high-quality products.

[0011] In order to solve the above problems, the utility model provides the following technical solutions:

[0012] A cyclone device for ultrafine powder classification comprises a cyclone cone and an ash bin arranged from top to bottom, a secondary air device is arranged between the cyclone cone and the ash bin, the secondary air device comprises an air inlet cavity shell, an air distribution cylinder covering a lower port of the cyclone cone and an upper port of the ash bin is arranged in the air inlet cavity shell, and air distribution holes are evenly distributed on the surrounding wall of the air distribution cylinder.

[0013] As an optimized solution, the air distribution cylinder is arranged in a conical shape, and the small-diameter end is arranged downward.

[0014] As an optimized solution, ventilation discs are respectively provided on the opposite outer walls of the air inlet cavity shell.

[0015] As an optimized solution, the air inlet chamber shell includes an upper cover and a lower cover arranged side by side from top to bottom, and through holes are respectively opened in the centers of the upper cover and the lower cover, and the two ends of the air distribution cylinder are fixedly connected to the two through holes accordingly.

[0016] As an optimized solution, a panel is fixedly connected between the outer walls of the upper cover and the lower cover, and mounting holes are opened on the opposite side walls of the panel, and the two ventilation discs are correspondingly arranged in the mounting holes.

[0017] As an optimized solution, the ventilation plate includes a mounting ring fixedly connected to the mounting hole, a base plate fixedly connected to the mounting ring, a plurality of base plate air holes are arranged around the center of the base plate, a panel is frictionally rotated on one side of the base plate, a plurality of panel air holes corresponding to the base plate air holes are opened on the panel, and the panel closes the base plate air holes through the area between adjacent panel air holes.

[0018] As an optimized solution, a bolt penetrating the base plate and the panel is provided in the mounting ring, a butterfly nut is threadedly connected to the bolt, and the shank end of the bolt and the butterfly nut are respectively against the base plate and the panel.

[0019] As an optimized solution, the upper cover and the lower cover are respectively provided with threaded holes, and are connected to the lower port flange of the cyclone cone and the upper port flange of the ash bin through the threaded holes.

[0020] As an optimized solution, a feed inlet and a fine powder outlet are provided at the upper end of the cyclone cone.

[0021] As an optimized solution, a blanking valve is provided at the lower end of the ash bin, and the blanking valve is connected to a blanking pipe.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] By setting a ventilation plate and rotating the panel, the deviation between the panel air holes and the bottom plate air holes is adjusted to adjust the air intake and switch it on and off. By setting an air distribution tube and evenly distributing air distribution holes on the surrounding wall, the air intake is evenly distributed, so that the air acts evenly on the material, improving the control of the particle size distribution range of the collected material, and obtaining high-quality products.

[0024] The amount of secondary air supply can be freely controlled, so that particles with a narrower particle size distribution range can be collected to obtain high-quality product particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the secondary air device of the utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the bottom plate air holes and the panel air holes of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the bottom plate and the panel of the utility model.

[0030] In the figure: 1-cyclone cone; 2-ash bin; 3-secondary air device; 4-feeding valve; 5-feeding pipe; 6-fine powder outlet; 7-feeding port; 8-upper cover; 9-lower cover; 10-air distribution cylinder; 11-air distribution hole; 12-ventilation plate; 13-mounting ring; 14-bottom plate air hole; 15-panel air hole; 16-bottom plate; 17-panel; 18-bolt; 19-butterfly nut. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0032] like Figures 1 to 4As shown, the cyclone device for ultrafine powder classification includes a cyclone cone 1 and an ash bin 2 arranged from top to bottom, a secondary air device 3 is arranged between the cyclone cone and the ash bin 2, the secondary air device 3 includes an air inlet cavity shell, an air distribution cylinder 10 covering the lower port of the cyclone cone 1 and the upper port of the ash bin 2 is arranged in the air inlet cavity shell, and air distribution holes 11 are evenly distributed on the surrounding wall of the air distribution cylinder 10.

[0033] The air distribution cylinder 10 is arranged in a conical shape, and the small-diameter end is arranged downward.

[0034] Ventilation discs 12 are respectively provided on the opposite outer walls of the air inlet chamber shell.

[0035] The air inlet chamber shell includes an upper cover 8 and a lower cover 9 which are arranged side by side from top to bottom. Through holes are respectively opened in the centers of the upper cover 8 and the lower cover 9. Both ends of the air distribution cylinder 10 are fixedly connected to the two through holes accordingly.

[0036] A surrounding plate is fixedly connected between the outer walls of the upper cover 8 and the lower cover 9. Mounting holes are opened on the opposite side walls of the surrounding plate, and two ventilation discs 12 are correspondingly arranged in the mounting holes.

[0037] The ventilation disc 12 includes a mounting ring 13 fixed in the mounting hole, a bottom plate 16 is fixed in the mounting ring 13, a plurality of bottom plate air holes 14 are arranged around the center of the bottom plate 16, a panel 17 is provided on one side of the bottom plate 16 for frictional rotation, a plurality of panel air holes 15 corresponding to the air holes of the bottom plate 16 are opened on the panel 17, and the panel 17 closes the bottom plate air holes 14 through the area between adjacent panel air holes 15.

[0038] A bolt 18 penetrating the bottom plate 16 and the panel 17 is disposed in the mounting ring 13 . A butterfly nut 19 is threadedly connected to the bolt 18 . The handle end of the bolt 18 and the butterfly nut 19 abut against the bottom plate 16 and the panel 17 respectively.

[0039] The upper cover 8 and the lower cover 9 are respectively provided with threaded holes, and are connected to the lower port flange of the cyclone cone 1 and the upper port flange of the ash bin 2 through the threaded holes.

[0040] A feed inlet 7 and a fine powder outlet 6 are provided at the upper end of the cyclone cone 1 .

[0041] A blanking valve 4 is provided at the lower end of the ash bin 2 , and a blanking pipe 5 is connected to the blanking valve 4 .

[0042] The blanking valve 4 is a butterfly valve, two of which are used in series and switched on and off alternately, which can ensure the negative pressure working environment in the cyclone collector and help the outflow and cutoff of the powder.

[0043] The working principle of this device is:

[0044] By setting the ventilation plate 12 and rotating the panel 17, the deviation between the panel air holes 15 and the bottom plate air holes 14 is adjusted to adjust the air intake and switch it on and off. By setting the air distribution cylinder 10 and evenly distributing the air distribution holes 11 on the surrounding wall, the air intake is evenly distributed, so that the air acts evenly on the material, improving the control of the particle size distribution range of the collected material, and obtaining high-quality products.

[0045] The amount of secondary air supply can be freely controlled, so that particles with a narrower particle size distribution range can be collected to obtain high-quality product particles.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A cyclone device for ultrafine powder classification, comprising a cyclone cone (1) and an ash bin (2) arranged from top to bottom, wherein a secondary air device (3) is arranged between the cyclone cone (1) and the ash bin (2), and characterized in that: The secondary air device (3) comprises an air inlet chamber shell, wherein an air distribution cylinder (10) covering the lower port of the cyclone cone (1) and the upper port of the ash bin (2) is provided in the air inlet chamber shell, and air distribution holes (11) are evenly distributed on the peripheral wall of the air distribution cylinder (10).

2. The cyclone device for ultrafine powder classification according to claim 1, characterized in that: The air distribution cylinder (10) is arranged in a conical shape, with the small-diameter end arranged downward.

3. The cyclone device for ultrafine powder classification according to claim 1, characterized in that: Ventilation disks (12) are respectively provided on the opposite outer walls of the air inlet chamber shell.

4. The cyclone device for ultrafine powder classification according to claim 3, characterized in that: The air inlet chamber shell comprises an upper cover (8) and a lower cover (9) arranged side by side from top to bottom, and through holes are respectively opened in the center of the upper cover (8) and the lower cover (9), and the two ends of the air distribution cylinder (10) are fixedly connected to the two through holes.

5. The cyclone device for ultrafine powder classification according to claim 4, characterized in that: A panel is fixedly connected between the outer walls of the upper cover (8) and the lower cover (9), and mounting holes are provided on the opposite side walls of the panel. The two ventilation discs (12) are correspondingly arranged in the mounting holes.

6. The cyclone device for ultrafine powder classification according to claim 5, characterized in that: The ventilation plate (12) includes a mounting ring (13) fixedly connected to the mounting hole, a bottom plate (16) fixedly connected to the mounting ring (13), a plurality of bottom plate air holes (14) being arranged around the center of the bottom plate (16), a panel (17) being frictionally rotated on one side of the bottom plate (16), a plurality of panel air holes (15) corresponding to the bottom plate (16) air holes being opened on the panel (17), and the panel (17) closing the bottom plate air holes (14) through the area between adjacent panel air holes (15).

7. The cyclone device for ultrafine powder classification according to claim 6, characterized in that: A bolt (18) penetrating the base plate (16) and the panel (17) is arranged in the mounting ring (13); a butterfly nut (19) is threadedly connected to the bolt (18); the handle end of the bolt (18) and the butterfly nut (19) respectively abut against the base plate (16) and the panel (17).

8. The cyclone device for ultrafine powder classification according to claim 4, characterized in that: The upper cover (8) and the lower cover (9) are respectively provided with threaded holes, and are connected to the lower port flange of the cyclone cone (1) and the upper port flange of the ash bin (2) through the threaded holes.

9. The cyclone device for ultrafine powder classification according to claim 1, characterized in that: The upper end of the cyclone cone (1) is provided with a feed inlet (7) and a fine powder outlet (6).

10. The cyclone device for ultrafine powder classification according to claim 1, characterized in that: A material dropping valve (4) is provided at the lower end of the ash bin (2), and the material dropping valve (4) is connected to a material dropping pipe (5).

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