An adjustable air ring device for powder selecting machine

Abstract

The present invention belongs to the technical field of powder selecting machines, and specifically discloses an adjustable air ring device for powder selecting machines, including an air ring body, the air ring body including a plurality of segmented air rings, the plurality of segmented air rings are spliced ​​together along the circumferential direction to form a complete air ring body; a connecting long hole is provided on one side of the segmented air ring, the segmented air ring is connected to the powder selecting machine housing through a connecting piece, the connecting piece is inserted into the connecting long hole and can move in the connecting long hole to adjust the position of the segmented air ring in the vertical direction. The present invention can adjust the cross-sectional area of ​​the air ring flow and improve the powder selecting quality.

Description

Technical Field

[0001] The invention relates to the technical field of powder classifiers, and in particular to an adjustable air ring device for a powder classifier. Background Art

[0002] The powder classifier is one of the important equipment in the grinding system. The large powder classifier is integrated into the vertical mill equipment. By setting up centrifugal components such as external fans and cage wheels, the ground mixed powder flows through the inner cavity of the powder classifier under the impetus of airflow, and the coarse powder and fine powder in the mixed powder are separated. The fine powder that meets the particle size requirements enters the next process, and the coarse powder that does not meet the particle size requirements returns to the grinding disc through the ash hopper under the action of gravity for re-grinding. The next process of material grinding has requirements for the particle size of the powder. Taking the calcination process as an example, too coarse particles may cause insufficient calcination and affect the quality of the finished product after calcination; too fine particles may cause excessive grinding of the material, resulting in an increase in production costs. Therefore, the separation of the mixed powder by the powder classifier is of vital importance in the entire production process and directly determines the quality of the final product.

[0003] The powder separator mainly separates the mixed powder through the centrifugal effect. The powder separator applies the centrifugal effect to the powder through the rotating cage wheel structure. Under the centrifugal effect, the sedimentation speed of the powder particles is ,in z is the vertical position of the powder particles, t is the action time, d is the powder particle diameter, σ is the density of powder particles, ρ is the density of the mixed powder, η is the viscosity coefficient, ω is the cage wheel speed, r is the rotation radius of the powder particles. When the density of the powder particles is less than the density of the mixed powder, the powder particles will rise and eventually enter the next process through the powder selector outlet; if they are equal, they will be suspended; if they are less than, they will fall and eventually enter the grinding disc through the ash hopper for re-grinding. For the rising powder particles, the finer the powder particles are, the easier it is to combine with the air, the smaller the actual density is, and the faster the rising speed is, so that the particle size of the powder in the air tends to increase from top to bottom in the powder selector cavity.

[0004] When the powder separator is working, there is a gap between the fixed air ring and the rotating cage wheel, which is the main flow channel of the air. According to the theory of fluid mechanics, the air volume passing through the air ring is ,in is the flow coefficient, F is the cross-sectional area of ​​the air ring, and p is the pressure difference on both sides of the air ring. ρis the airflow density. The larger the area F is, the greater the air volume passing through, and the easier it is to obtain the lower airflow, so that the particle size of the powder after powder selection is larger. On the contrary, the smaller the area F is, the smaller the particle size of the powder after powder selection is. Therefore, by adjusting the position of the air ring, the cross-sectional area of ​​the air ring flow can be adjusted to control the particle size of the powder after powder selection. The cross-sectional area F of the air ring flow is composed of two parts. One part is formed by the gap between the segmented air ring and the cage wheel, which is the main part, and the other part is formed by the gap between two adjacent segmented air rings. Among them, if the gap between the two segmented air rings is too large, it may cause air leakage and affect the quality of powder selection.

[0005] In actual production, there may be air leakage and blockage in the pipeline, which will cause the pressure difference on both sides of the air ring to change, making the originally set cross-sectional area of ​​the air ring not meet the requirements, affecting the quality of powder selection. Therefore, the cross-sectional area of ​​the air ring needs to be adjusted. At present, the air ring position of large vertical mill powder selectors is fixed, which cannot meet the needs of actual production changes. After a period of operation, the fine powder particle size at the outlet of the powder selector deviates from the set value, affecting the subsequent processes. In severe cases, it will lead to the output of unqualified terminal products. At the same time, the powder selector itself has air leakage problems, which further aggravates the aforementioned contradictions. Summary of the invention

[0006] The invention provides an adjustable air ring device for a powder classifier, aiming to be able to adjust the flow cross-sectional area of ​​the air ring and improve the powder selection quality.

[0007] The present invention is achieved through the following technical scheme: an adjustable air ring device for a powder classifier, comprising an air ring body, wherein the air ring body comprises a plurality of segmented air rings, and the plurality of segmented air rings are spliced ​​together along the circumferential direction to form a complete air ring body; a connecting long hole is provided on one side of the segmented air ring, and the segmented air ring is connected to the powder classifier housing through a connecting piece, and the connecting piece is inserted into the connecting long hole and can move in the connecting long hole to adjust the position of the segmented air ring in the vertical direction.

[0008] Beneficial effect: The air ring device in the present technical solution can adjust the position of the segmented air ring by changing the position of the connecting piece in the connecting long hole, thereby adjusting the cross-sectional area of ​​the air ring flow, thereby controlling the particle size of the powder after separation, thereby improving the powder selection quality.

[0009] In addition, the segmented arrangement of the air ring body in this solution effectively reduces the weight of a single segmented air ring and facilitates the manufacture, installation, disassembly, and maintenance of the segmented air ring.

[0010] Furthermore, the connecting long hole is an inclined long hole arranged obliquely.

[0011] Beneficial effect: The connecting long hole in this solution is an inclined long hole, so when adjusting the position of the segmented air ring, the position of the segmented air ring can be adjusted in the vertical direction while the position of the segmented air ring can be adjusted in the horizontal direction, so that the gap between two adjacent segmented air rings is indirectly adjusted to avoid air leakage caused by excessive gaps between two adjacent segmented air rings. After adjusting the position of the segmented air ring, since the connecting long hole is inclined, it can support the connecting piece, thereby having a certain self-locking effect, making the entire connection structure more stable and firm.

[0012] Furthermore, the tangent value of the expansion slope angle of the inclined long hole is smaller than the friction coefficient between the segmented air ring and the connecting member.

[0013] Beneficial effect: Since the segmented air ring is connected to the powder classifier housing through a connecting piece, and the powder classifier housing has a connecting long hole, the tangent value of the expanded slope angle of the inclined long hole in this scheme is smaller than the friction coefficient between the segmented air ring and the connecting piece, so that the self-locking of the connecting piece during later installation can be achieved to prevent relative displacement of the connecting piece, thereby locking the position of each segmented air ring after adjustment.

[0014] Furthermore, the segmented air ring has a fan-shaped structure, and a plurality of connecting long holes are provided at intervals on one side of the segmented air ring.

[0015] Beneficial effect: The segmented air ring in this solution is fan-shaped, so that multiple segmented air rings are spliced ​​together to form a complete annular air ring body, so that the assembly accuracy between the air ring body and the powder classifier is higher. And there are multiple connecting long holes on the segmented air ring to ensure stable and reliable installation and uniform force.

[0016] Furthermore, the connecting long hole is a vertical long hole arranged vertically.

[0017] Beneficial effect: This solution discloses another structure of a connecting long hole, which is vertically arranged so that the segmented air ring can be adjusted in position in the vertical direction.

[0018] Furthermore, the segmented air ring includes a bottom plate, an inner plate and an outer plate, and the outer plate is vertically connected to the outer side of the bottom plate upward, and the inner plate is vertically connected to the inner side of the bottom plate downward; the connecting long hole is located on the outer plate.

[0019] Beneficial effect: In this scheme, the outer plate and the inner plate of the segmented air ring are respectively arranged on both sides of the bottom plate, so that the outer plate is convenient for connecting with the middle shell of the powder classifier, and the inner plate and the bottom plate are convenient for forming an air outlet with the top of the cage wheel in the powder classifier, so as to form a wind direction flow channel.

[0020] Furthermore, the inner plate and the outer plate are both arc-shaped plates.

[0021] Beneficial effect: With such an arrangement, the inner and outer sides of the air ring body after the multiple segmented air rings are spliced ​​together are both circular, so that the matching accuracy of the segmented air ring and the powder classifier is higher.

[0022] Furthermore, a rib plate is connected between the bottom plate and the outer plate of each segmented air ring.

[0023] Beneficial effect: The setting of the rib plate can enhance the strength and stability of the segmented air ring.

[0024] Furthermore, the connecting piece includes a connecting bolt and a nut. The connecting bolt passes through the powder classifier housing and the segmented air ring in sequence and is fixed by the nut. A flat washer and a spring washer are installed between the connecting bolt and the nut in sequence.

[0025] Beneficial effects: In this solution, the flat washer is provided to expand the force-bearing area and stabilize the connection of the connecting bolts; the spring washer is provided to absorb the vibration of the equipment caused by the vertical mill grinding the raw materials and prevent the connection of the connecting bolts from loosening.

[0026] Furthermore, two nuts are provided, the two nuts are threadedly connected to the connecting bolts, and the nut located on the outside is spot welded and reinforced to the connecting bolts.

[0027] Beneficial effect: The two nuts can enhance the tightness of the connection between the segmented air ring and the middle shell of the powder classifier, and can prevent the nuts from loosening due to equipment vibration when the vertical mill powder classifier grinds raw materials. At the same time, this solution also performs spot welding reinforcement between the nuts on the outside and the connecting bolts, which can further prevent the nuts from loosening, and the spot welding parts can be knocked off manually, which is convenient for adjusting the position of the segmented air ring during production and use.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] The present invention abandons the traditional method of threaded connection between the air ring and the shell of the powder classifier through ordinary screw holes. By arranging connecting long holes on the air ring and arranging ordinary screw holes on the powder classifier shell, the purpose of flexibly adjusting the position of the air ring of the powder classifier is achieved.

[0030] By adjusting the position of the segmented air ring of the powder classifier, the gap area between the segmented air ring of the powder classifier and the cage wheel of the powder classifier can be adjusted, that is, the air outlet area of ​​the powder classifier can be adjusted. According to the theory of fluid mechanics, after the fluid density and pressure difference on both sides of the air ring are given, adjusting the air outlet area of ​​the powder classifier can directly affect the air volume of the powder classifier. Under the centrifugal action of the cage wheel, the particle size of the upper powder in the powder classifier cavity is small, and the particle size of the lower powder in the cavity is large. Reducing the air volume of the powder classifier can select more upper airflow, so that the particle size of the powder after powder selection is smaller; increasing the air volume of the powder classifier can select more lower airflow, so that the particle size of the powder after powder selection is larger, and finally the particle size of the powder after powder selection is controlled. Compared with the vertical long holes set vertically which can only adjust the position of the segmented air ring in the vertical direction, the present invention provides a method of setting an inclined long hole on the segmented air ring, so that the connecting piece can move in the inclined long hole to adjust the position of the segmented air ring. In this way, when the segmented air ring is adjusted, it can be adjusted in the vertical direction while also having the function of adjusting the position of the segmented air ring in the horizontal direction, thereby indirectly adjusting the gap between two adjacent segmented air rings to avoid air leakage caused by excessive gap between two adjacent segmented air rings.

[0031] In the present invention, the tangent value of the expansion slope angle of the inclined long hole is set to be smaller than the friction coefficient between the segmented air ring and the connecting piece, so that the connecting bolt forms a self-locking on the inclined long hole of the segmented air ring. The connecting bolt does not shift during the production process, locks the position of each segmented air ring, and indirectly locks the flow cross-sectional area of ​​the air ring, so that the particle size of the powder after powder selection remains stable. By segmenting the air ring, the weight of a single air ring is effectively reduced, and manufacturing, installation, disassembly, and maintenance are facilitated. By setting a flat washer and a spring washer in the connection between the connecting bolt and the nut, the installation stress of the air ring is dispersed, the vibration during the grinding process of the vertical mill is absorbed, and the loosening of the air ring during the operation of the powder selection machine is prevented. By setting a double nut, and after the double nuts are tightened in turn, the outer nut and the connecting bolt are spot welded, the loosening of the air ring during the operation of the powder selection machine is further prevented, because the spot welding part can be knocked off manually, which provides convenience for adjusting the position of the air ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0033] Figure 1 A three-dimensional diagram of a segmented air ring in an embodiment of an adjustable air ring device for a powder classifier of the present invention;

[0034] Figure 2 A top view of an embodiment of an adjustable air ring device for a powder classifier according to the present invention;

[0035] Figure 3A partial cross-sectional view of an adjustable air ring device for a powder classifier according to the present invention after the segmented air ring is connected to the powder classifier Figure 1 ;

[0036] Figure 4 A partial cross-sectional view of an adjustable air ring device for a powder classifier according to the present invention after the segmented air ring is connected to the powder classifier Figure 2 ;

[0037] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0038] Figure 6 A schematic diagram of the structure for generating a gap between two adjacent segmented air rings;

[0039] Figure 7 The present invention is a stereoscopic diagram of a segmented air ring in another embodiment of an adjustable air ring device for a powder classifier.

[0040] Marks and corresponding parts names in the attached drawings:

[0041] Flat washer 1, spring washer 2, nut 3, segmented air ring 4, bottom plate 401, outer plate 402, rib plate 403, inner plate 404, connecting long hole 4021, powder classifier upper shell 5, powder classifier middle shell 6, connecting bolt 7, cage wheel 8, air guide ring 9, powder classifier lower shell 10. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. Example

[0043] like Figure 1-Figure 2 As shown, this embodiment provides an adjustable air ring device for a powder selector, including an air ring body, the air ring body including a plurality of segmented air rings 4, the plurality of segmented air rings 4 are spliced ​​together along the circumferential direction to form a complete air ring body, in this embodiment, the segmented air ring 4 is fan-shaped, and a plurality of connecting long holes 4021 are arranged at intervals on one side of the segmented air ring 4. The segmented air ring 4 effectively reduces the weight of a single air ring, which is conducive to the manufacture, installation, disassembly, and maintenance of the segmented air ring 4.

[0044] A connecting long hole 4021 is opened on one side of the segmented air ring 4, and the segmented air ring 4 is connected to the powder classifier housing through a connecting piece. The connecting piece is inserted into the connecting long hole 4021 and can move in the connecting long hole 4021 to adjust the position of the segmented air ring 4 in the vertical direction.

[0045] like Figure 1As shown, in this embodiment, the segmented air ring 4 includes a bottom plate 401, an inner plate 404 and an outer plate 402, the bottom plate 401 is horizontally arranged, and the outer plate 402 is vertically connected to the outer side of the bottom plate 401 upward, and the inner plate 404 is vertically connected to the inner side of the bottom plate 401 downward, so that a Z-shaped structure is formed between the inner plate 404, the bottom plate 401 and the outer plate 402, and the inner plate 404 and the outer plate 402 face opposite directions. Both the inner plate 404 and the outer plate 402 are arc-shaped plates, so that when multiple segmented air rings 4 are spliced ​​together, a wind ring body with a circular ring structure is formed.

[0046] In this embodiment, a rib plate 403 is connected between the bottom plate 401 and the outer plate 402 of each segmented air ring 4 . In this embodiment, three rib plates 403 are welded and fixed on each segmented air ring 4 .

[0047] In this embodiment, the connecting long holes 4021 are located on the outer plate 402, and in this embodiment, there are four connecting long holes 4021 on the outer plate 402 of each segmented air ring 4, two of which are located on the left side of the middle rib plate 403, and the other two are located on the right side of the middle rib plate 403. The provision of the four connecting long holes 4021 ensures stable and reliable installation of the segmented air ring 4 and uniform force.

[0048] Combination Figure 3 and Figure 4 As shown, the connecting piece in this embodiment includes a connecting bolt 7 and a nut 3. The connecting bolt 7 passes through the powder classifier housing and the segmented air ring 4 in sequence and is fixed by the nut 3.

[0049] like Figure 1 As shown, in this embodiment, the connecting long hole 4021 is an inclined long hole set obliquely, and the inner plate 404 and the outer plate 402 are both arc-shaped plates. Therefore, the inclined long hole located on the outer plate 402 in this embodiment is a spiral long hole, that is, the inclined long hole is one section of the spiral section, and the tangent value of the expansion slope angle θ of the inclined long hole is Smaller than the friction coefficient between the segmented air ring 4 and the connecting parts Specifically: In this embodiment, the tangent value of the expansion slope angle θ of the inclined long hole is smaller than the friction coefficient between the segmented air ring 4 and the connecting bolt 7 of the connecting member. ', realize the self-locking of the connector after installation, so that the connector does not shift, and locks the position of each segmented air ring 4 after adjustment. Figure 7 As shown, in another embodiment, the connecting long hole 4021 is a vertical long hole arranged vertically.

[0050] Combination Figure 4 and Figure 5 As shown, a flat washer 1 and a spring washer 2 are sequentially installed between the connecting bolt 7 and the nut 3. Specifically:

[0051] The powder classifier housing includes a powder classifier middle housing 6, a powder classifier upper housing 5 and a powder classifier lower housing 10. The powder classifier cage wheel 8 is located between the powder classifier upper housing 5 and the powder classifier lower housing 10. The powder classifier middle housing 6 is connected between the powder classifier upper housing 5 and the powder classifier lower housing 10. The segmented air ring 4 in this embodiment is located above the cage wheel 8 and is connected to the powder classifier middle housing 6.

[0052] like Figure 4 As shown, an air flow channel is formed between the segmented air ring 4 and the cage wheel 8 ( Figure 4 The dotted line with an arrow in the middle represents the air flow channel). In this embodiment, a common screw hole is provided on the shell 6 of the powder selector corresponding to the connecting long hole 4021 on the segmented air ring 4. In this embodiment, the flat washer 1 and the spring washer 2 are both sleeved on the connecting bolt 7. The flat washer 1 can expand the force bearing area and stabilize the connection of the connecting bolt 7. The spring washer 2 can absorb the vibration of the equipment caused by the vertical mill grinding the raw material. When the nut 3 is tightened, the spring washer 2 and the flat washer 1 can be pressed tightly to prevent the connection of the connecting bolt 7 from loosening.

[0053] In this embodiment, two nuts 3 are provided, and the two nuts 3 are threadedly connected to the connecting bolts 7 , and the nuts 3 located on the outer sides are spot welded and reinforced with the connecting bolts 7 .

[0054] The specific implementation process is as follows:

[0055] Move the segmented air ring 4 to the initial setting position, install the connecting bolt 7, flat washer 1, spring washer 2, and two nuts 3 in sequence, fully tighten the first nut 3 when installing it, then install the second nut 3 and tighten it again, and finally spot weld the outer side of the second nut 3 to the bolt. Continue in sequence until all segmented air rings 4 are installed to form a complete set of powder classifier air ring device.

[0056] During the production process, according to the actual particle size of the powder selection product and the air flow parameters in the inner cavity of the powder selection machine, the vertical position of the segmented air ring 4 that needs to be adjusted is calculated, the spot welds are knocked off in turn, the nuts 3, spring washers 2, and flat washers 1 are removed, the segmented air ring 4 is moved to the adjustment position, and the segmented air ring 4 is installed according to the initial installation method to form a complete set of powder selection machine air ring device after adjustment.

[0057] Combination Figure 6 As shown, two adjacent segmented air rings 4 are described by taking air ring I and air ring II as an example. There is an air ring gap III between air ring I and air ring II. When two adjacent segmented air rings 4 (such as Figure 6If the gap between air ring I and air ring II is too large, causing air leakage, you can refer to the above method to move one or two of the two adjacent segmented air rings 4. If necessary, you can move the entire segmented air ring 4 to reduce the gap between the two adjacent segmented air rings 4 and solve the air leakage of the segmented air ring 4. Due to the self-locking function of the segmented air ring 4, the cross-sectional area of ​​the air ring remains stable during operation, and the particle size of the powder after powder selection also remains stable.

[0058] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

[0059] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0060] In the description of this document, terms such as "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0061] In the description of this document, some terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0062] In the description of this document, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] The structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in this technical briefing book for technical personnel in this field to understand and read, and are not used to limit the restrictive conditions for the implementation of this application. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0064] The terms used in this document are those common terms currently widely used in the art in consideration of the functions of the present disclosure, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the document should not be understood as simple names, but rather as an overall description based on the meaning of the terms and the present disclosure.

[0065] Flowcharts or text are used in this document to illustrate the operating steps performed according to the embodiments of the present application. It should be understood that the operating steps in the embodiments of the present application are not necessarily accurately performed in the order of recording. On the contrary, various steps can be processed in reverse order or simultaneously as needed. At the same time, other operations can also be added to these processes, or a certain step or several steps can be removed from these processes.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable air ring device for a powder classifier, comprising an air ring body, characterized in that: The air ring body includes a plurality of segmented air rings, which are spliced ​​with each other along the circumferential direction to form a complete air ring body; a connecting long hole is provided on one side of the segmented air ring, and the segmented air ring is connected to the powder classifier housing through a connecting piece, and the connecting piece is inserted into the connecting long hole and can move in the connecting long hole to adjust the position of the segmented air ring in the vertical direction; the connecting long hole is an inclined long hole set at an angle.

2. The adjustable air ring device for a powder classifier according to claim 1, characterized in that: The tangent value of the expansion slope angle of the inclined long hole is smaller than the friction coefficient between the segmented air ring and the connecting piece.

3. The adjustable air ring device for a powder classifier according to claim 1, characterized in that: The segmented air ring is in a fan-shaped structure, and a plurality of connecting long holes are arranged at intervals on one side of the segmented air ring.

4. The adjustable air ring device for a powder classifier according to claim 1, characterized in that: The connecting long hole is a vertical long hole arranged vertically.

5. An adjustable air ring device for a powder classifier according to any one of claims 1 to 4, characterized in that: The segmented air ring comprises a bottom plate, an inner plate and an outer plate, wherein the outer plate is vertically connected to the outer side of the bottom plate upwards, and the inner plate is vertically connected to the inner side of the bottom plate downwards; the connecting long hole is located on the outer plate.

6. The adjustable air ring device for a powder classifier according to claim 5, characterized in that: The inner plate and the outer plate are both arc-shaped plates.

7. The adjustable air ring device for a powder classifier according to claim 5, characterized in that: A rib plate is connected between the bottom plate and the outer plate of each segmented air ring.

8. The adjustable air ring device for a powder classifier according to claim 1, characterized in that: The connecting piece includes a connecting bolt and a nut. The connecting bolt passes through the powder selector housing and the segmented air ring in sequence and is fixed by the nut. A flat washer and a spring washer are installed between the connecting bolt and the nut in sequence.

9. The adjustable air ring device for a powder classifier according to claim 8, characterized in that: The nuts are provided with two, the two nuts are threadedly connected with the connecting bolts, and the nuts located on the outer sides are spot welded and reinforced with the connecting bolts.

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