Airflow grading device

Abstract

The airflow classification device comprises a feeding assembly, airflow classification equipment, a dust remover and a draught fan, the airflow classification equipment comprises a barrel, the barrel comprises a straight barrel section and a conical barrel section, a feeding port is formed in the circumferential wall of the upper end of the straight barrel section, and a first discharging port is formed in the end, away from the straight barrel section, of the conical barrel section; the driving assembly is arranged above the straight barrel section, and a second discharging opening is formed in the driving assembly; and the grading wheel is arranged in the straight barrel section and communicates with the second discharging opening. When the device is used, materials enter the barrel under the negative pressure generated by the draught fan, then the materials collide with the inner circumferential wall of the barrel in the spiral movement process of the barrel to generate friction resistance, the sedimentation time of the materials in the barrel is prolonged, and therefore the materials can be classified more sufficiently, and the classification precision of the materials is improved. In addition, air does not need to be fed for multiple times, and therefore the situation that the negative pressure at the feeding port is too low, and the feeding amount is affected can be avoided.

Description

Technical Field

[0001] The present application generally relates to the technical field of material classification devices. More specifically, the present application relates to an airflow classification device. Background Art

[0002] An air classifier is a device that uses the difference in settling velocity of particles of varying sizes in an airflow to classify them. Currently, the classification process of a common air classifier involves sending the material into a classification chamber, where the centrifugal airflow generated by the rotation of the classifying wheel and the induced draft airflow generated by negative pressure cooperate to classify the material. While this classification operation can meet the material classification requirements to a certain extent, it also has the limitation of poor classification results. To improve the classification effect, many classifiers use multiple air inlets or structures with multiple classifying wheels. While these designs improve classification accuracy to a certain extent, they also complicate the overall structure of the machine, increasing the difficulty of manufacturing and maintenance.

[0003] In addition, when the air classifier adopts multiple air inlet methods, the negative pressure of the front hopper will be too low and the air volume will be reduced, thereby affecting the feeding efficiency of the material and reducing production capacity.

[0004] In summary, the air flow classifiers in the prior art are either complex in structure or difficult to achieve ideal classification effects for materials requiring a narrow particle size distribution range, thus limiting the use of air flow classifiers in certain specific application scenarios.

[0005] In view of this, there is an urgent need to provide an airflow classification device with a simple structure, high classification efficiency and classification accuracy. Utility Model Content

[0006] In order to at least solve one or more of the technical problems mentioned above, the present application proposes an airflow classification device with a simple structure, high classification efficiency and high classification accuracy.

[0007] The present application provides an airflow classification device, comprising a feed assembly, an airflow classification device, a dust collector and a fan connected in sequence, wherein the airflow classification device comprises: a cylinder, the cylinder comprising a connected cylindrical straight cylinder section and a conical tapered cylinder section, wherein a feed port connected to the feed assembly is provided on the peripheral wall of the upper end of the straight cylinder section, and a first discharge port is provided at one end of the tapered cylinder section away from the straight cylinder section; a drive assembly, which is arranged above the straight cylinder section and has a second discharge port on the drive assembly, wherein the second discharge port is respectively connected to the straight cylinder section and the dust collector; and a classifying wheel, which is arranged in the straight cylinder section and is connected to the second discharge port.

[0008] In some embodiments, along the longitudinal section of the feed port in the length direction, the feed port has at least one contour line that is tangent to the contour line of the inner wall of the barrel.

[0009] In some embodiments, the center point of the feed port and the center point of the classifying wheel are located on a horizontal line.

[0010] In some embodiments, the rotation direction of the classifying wheel is opposite to the movement direction of the material after entering the cylinder.

[0011] In some embodiments, the ratio of the height h1 of the classifying wheel to the height h2 of the feed port ranges from 0.3 to 1.

[0012] In some embodiments, the classifying wheel is cylindrical; the ratio of the diameter D of the straight cylindrical section to the outer diameter d1 of the classifying wheel is in the range of 1.5 to 3.

[0013] In some embodiments, the ratio of the height L1 of the straight tube section to its diameter D is in the range of 1 to 2.5.

[0014] In some embodiments, the ratio of the height L2 of the tapered section to the diameter D of the straight section ranges from 1.5 to 2.5.

[0015] In some embodiments, the ratio of the diameter d2 of the through hole 1013 on the end cover 1012 of the straight section 1011 to the diameter D of the straight section 1011 ranges from 0.25 to 0.45.

[0016] In some embodiments, N airflow classification devices are connected in series in the airflow classification apparatus, where N is a positive integer greater than or equal to 1.

[0017] Through the airflow grading equipment provided as above, the embodiment of the present application is to set a feed port on the peripheral wall of the upper end of the straight cylinder section on the grading equipment, and set a second discharge port connected to the straight cylinder section on the driving assembly, and the second discharge port is connected to the fan through a dust collector. When in use, the material enters the cylinder from the feed port under the action of the fan, and then the material collides with the inner peripheral wall of the cylinder during the spiral motion of the cylinder to generate friction resistance, resulting in its sedimentation time in the cylinder being prolonged, so that the material can be more fully graded and the grading accuracy of the material is improved. Furthermore, in some embodiments, by making the rotation direction of the grading wheel opposite to the movement direction of the material after entering the cylinder, the movement speed of the material can be reduced under the action of the centrifugal airflow generated by the grading wheel, so that the material can be better deagglomerated and graded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 A schematic diagram showing an airflow classification device in an airflow classification apparatus according to an embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram of a cylinder according to an embodiment of the present application is shown;

[0021] Figure 3 A cross-sectional view of the barrel at the feed port of an embodiment of the present application is shown;

[0022] Figure 4 A schematic structural diagram of a grading wheel according to an embodiment of the present application is shown;

[0023] Figure 5 A schematic structural diagram of the upper flange on the classifying wheel according to an embodiment of the present application is shown;

[0024] Figure 6 A schematic structural diagram of the lower cover on the grading wheel in an embodiment of the present application is shown;

[0025] Figure 7 A schematic structural diagram of a feed assembly according to an embodiment of the present application is shown;

[0026] Figure 8 An airflow classification device according to an embodiment of the present application is shown;

[0027] Figure 9 Another airflow classification device in an embodiment of the present application is shown.

[0028] In the figure: 100, airflow classification equipment; 200, dust collector; 300, feeder; 400, airflow classification device;

[0029] 101, cylinder; 103, fan; 104, fan off; 105, feed assembly;

[0030] 1011, straight section; 1012, end cover; 1013, through hole; 1014, feed port; 1015, tapered section; 1016, first discharge port; 1017, sleeve;

[0031] 1021. Drive assembly; 1022. Motor; 1023. Coupling; 1024. Bearing seat; 1025. Classifying shaft; 1026. Second discharge port; 1027. Classifying wheel; 1028. Upper flange; 1029. Blade; 1030. Connecting sleeve; 1031. Lower cover;

[0032] 1041, flange;

[0033] 1051, straight tube; 1052, funnel;

[0034] 201. The second level of fan. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0036] It should be understood that the terms "include" and "comprising" used in the description and claims of this application indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this specification and claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" as used in this specification and claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0038] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0039] The specific implementation of the present application will be described in detail below with reference to the accompanying drawings.

[0040] like Figure 1-9As shown, the present application provides an airflow classification device 400, which includes a feed assembly 105, an airflow classification device 100, a dust collector 200, and a fan 103 connected in sequence. The airflow classification device 400 can be used to classify positive electrode materials, negative electrode materials, additives, etc. of different particle sizes for batteries, and can also be used to classify materials used in the manufacture of other products. The airflow classification device 100 in the airflow classification device 400 is now described in detail.

[0041] like Figure 1 and Figure 2 As shown, in some embodiments, the airflow classification device 100 includes a cylinder 101, a drive assembly 1021, and a classification wheel 1027. Specifically, the cylinder 101 is a hollow structure surrounded by a shell, which includes a cylindrical straight section 1011 and a conical tapered section 1015, wherein the tapered section 1015 is arranged below the straight section 1011 and is connected to the straight section 1011 by welding or bolts. A feed port 1014 is provided on the peripheral wall of the straight section 1011, which is connected to the outside and is used for materials to enter the cylinder. A first discharge port 1016 is provided at one end of the tapered section 1015 away from the straight section 1011 to discharge the classified materials from the cylinder 101.

[0042] The classifying wheel 1027 in the airflow classifying apparatus 100 is disposed within the straight section 1011, and the drive assembly 1021 is disposed above the straight section 1011. More specifically, an end cap 1012 is provided at the end of the straight section 1011 away from the conical section 1015. This end cap 1012 has a through-hole 1013 extending therethrough. A classifying shaft 1025 on the drive assembly 1021 passes through this through-hole 1013, connecting the drive assembly 1021 to the classifying wheel 1027. Furthermore, the drive assembly 1021 is provided with a second discharge port 1026 that communicates with the interior of the straight section 1011. This second discharge port 1026 is connected to the fan 103 via the dust collector 200.

[0043] In some specific embodiments, the ratio of the diameter d2 of the through-hole 1013 in the end cap 1012 of the straight cylindrical section 1011 to the diameter D of the straight cylindrical section 1011 ranges from 0.25 to 0.45. By controlling the ratio of the through-hole diameter to the diameter of the straight cylindrical section, the solution provided in this embodiment can optimize the flow characteristics of the material within the cylinder. Smaller through-holes help to concentrate the material, allowing it to pass through the classifying wheel more efficiently, thereby improving classification efficiency.

[0044] In some specific embodiments, the ratio of the diameter D of the straight cylindrical section to the outer diameter d1 of the classifying wheel is in the range of 1.5 to 3. The ratio range provided in this embodiment can ensure that the classifying wheel 1027 has sufficient space to rotate in the straight cylindrical section 1011 while maintaining a sufficient distance to avoid direct contact between the material and the inner circumferential wall of the straight cylindrical section 1011, which helps to form a stable classification area.

[0045] like Figure 3 As shown, in one embodiment, the classifying wheel 1027 is arranged at the end of the straight tube section away from the tapered tube section, and the central axis of the classifying wheel coincides with the central axis of the cylinder. The feed port is arranged on the peripheral wall of the upper end of the straight tube section, and has a certain height and a certain width, wherein the height direction refers to the extension direction from the straight tube section 1011 to the tapered tube section 1015, and the width direction refers to the horizontal length perpendicular to the height direction of the feed port 1014. In this embodiment, along the longitudinal section of the length direction of the feed port, the feed port has at least one contour line that is tangent to the contour line of the inner wall of the cylinder. That is to say, in this embodiment, the feed port is not arranged towards the central axis of the cylinder, and the feed port is connected to the inner peripheral wall of the cylinder in a smooth transition.

[0046] In one embodiment, the center point of the feed port and the center point of the classifying wheel are located on a horizontal line. That is, in this solution, by aligning the feed port 1014 with the classifying wheel 1027 in the vertical direction, it is ensured that when the material enters the classification area, it can interact with the airflow generated by the classifying wheel in an optimal manner, thereby ensuring the stability and consistency of the material when entering, and helping to improve the accuracy and efficiency of classification.

[0047] In some specific embodiments, the ratio of the height h1 of the classifying wheel 1027 to the height of the feed opening h2 ranges from 0.3 to 1. The solution provided in this embodiment can influence the flow rate of material entering the classification area by adjusting the ratio of the height of the classifying wheel 1027 to the height of the feed opening 1014. This helps control the feed rate of the material and ensure the stability and continuity of the classification process.

[0048] In some specific embodiments, the ratio of the height h2 to the width h3 of the feed port 1014 is in the range of 1.0 to 3.0. The feed port 1014 in this embodiment has a relatively high height, which helps control the flow rate of the material and reduces the direct impact of the material on the classifying wheel 1027, thereby reducing wear and improving classification efficiency.

[0049] During use, the material enters the hopper 1052 in the feed assembly 105 from the feeder 300, and then enters the straight pipe 1051 connected to the feed port 1014 from the hopper 1052. The fan 103 connected to the second discharge port 1026 in the airflow classifier is then operated to generate negative pressure in the cylinder 101. After passing through the feed port 1014, the material enters the straight section 1011 of the cylinder 101 in a tangential direction and moves toward the inner circumferential wall of the straight section 1011. The material then spirals downward along the cylinder 101 for classification. The fine powder produced by classification, under the action of negative pressure and induced draft, passes through the classifying wheel 1027 and the second discharge port 1026 and enters the dust collector 200. The coarse powder produced by classification is discharged through the first discharge port 1016 in the conical section.

[0050] In the solution provided in the present application, the material collides with the inner wall of the cylinder 101 during the rotation and downward movement of the cylinder 101, thereby generating frictional resistance, which causes the sedimentation time of the material in the cylinder 101 to be prolonged, thereby enabling the material to be more fully classified.

[0051] Since a classifying wheel is also provided in the cylinder of the airflow classifying device in this application, the above scheme has detailedly described the movement process of the material being classified in the cylinder when the classifying wheel is not moving. Next, the process of the material being classified under the action of the classifying wheel is described.

[0052] In one specific embodiment, the rotation direction of the classifying wheel 1027 is opposite to the direction of movement of the material after entering the cylinder 101. That is, when the material enters the cylinder 101 tangentially and moves downward along the inner wall of the cylinder, it encounters the high-speed airflow generated by the rotation of the classifying wheel 1027. Because the material's movement direction is opposite to the airflow's, the two will collide. This relative motion not only helps break up aggregates in the material, allowing individual particles to be separated, but also reduces the material's speed as it passes through the classification zone, thereby extending the material's residence time in the classification zone and allowing more time for classification.

[0053] It is worth noting that the induced draft and negative pressure generated by the blower 103 can be adjusted to help the material be sucked into the straight section 1011 from the feed port on the side of the cylinder 101, thereby realizing tangential feeding. It is worth noting that the tangential feeding in the present application refers to the material entering the classifier along the side of the straight section 1011 of the cylinder 101, and its movement direction is consistent with the tangential direction of the straight section 1011. In other words, the material in the airflow classification equipment provided by the present application does not fall directly vertically, but is introduced into the interior of the classifier along a straight line direction tangent to the side of the straight section 1011. This means that the path of the material entering intersects with the side of the straight section 1011, forming a tangent angle.

[0054] In some specific embodiments, the ratio of the height L1 of the straight section 1011 to its diameter D is in the range of 1 to 2.5. By limiting the height and diameter of the straight section 1011 to a certain range, this embodiment controls the centrifugal airflow generated by the centrifugal wheel to disperse the material toward the periphery, where it then falls on the inner circumferential wall of the straight section 1011, generating friction and enabling better classification of the material. Furthermore, providing a taller straight section 1011 can increase the residence time of the material in the airflow classification device, allowing the material to have more time to be acted upon by the classification wheel 1027, thereby improving the accuracy and efficiency of classification.

[0055] In some specific embodiments, the ratio of the height L2 of the tapered section 1015 to the diameter D of the straight section 1011 ranges from 1.5 to 2.5. Since the straight section 1011 and the tapered section 1015 are interconnected, the diameter of the straight section 1011 in this embodiment is the maximum diameter of the tapered section 1015. Since the ratio of the height of the tapered section 1015 to the diameter of the straight section 1011 can affect the flow path of the material within the cylinder, the ratio in this embodiment helps guide the material to smoothly transition from the straight section 1011 to the tapered section 1015, reducing flow resistance.

[0056] like Figure 1 As shown, in one embodiment, the drive assembly 1021 above the straight section 1011 includes a bearing seat 1024, a motor 1022, a grading wheel 1027, and a grading shaft 1025. Specifically, the bearing seat 1024 is fixed to the top of the end cover 1012 of the straight section 1011 by bolts or welding, the motor 1022 is mounted on the bearing seat 1024 by bolts, the motor shaft on the motor 1022 is connected to the grading shaft 1025 via a coupling, and the grading shaft 1025 is inserted into the straight section 1011 through the through hole 1013 in the end cover 1012 and connected to the grading wheel 1027.

[0057] like Figure 4-Figure 6 As shown, the classifying wheel 1027 includes a hollow cylindrical connecting sleeve 1030, and a plurality of blades 1029 are evenly distributed radially along the outer circumference of the connecting sleeve 1030. The upper end of the connecting sleeve 1030 and the upper ends of the blades 1029 are welded to the upper flange 1028, and the upper flange 1028 is fixed to the inner surface of the end cover 1012 of the straight cylinder section 1011. The lower end of the connecting sleeve 1030 and the lower ends of the blades 1029 are welded to the lower cover 1031.

[0058] In some specific embodiments, the ratio of the height h1 of the classifying wheel 1027 to its diameter d1 ranges from 0.3 to 1. The ratio of the height h1 of the classifying wheel 1027 to its diameter affects the residence time and stress conditions of the material near the classifying wheel 1027. The ratio range provided in this embodiment can ensure that the material is fully and evenly dispersed around the classifying wheel 1027, thereby improving classification accuracy.

[0059] It is worth noting that the bearing seat 1024 has a cavity enclosed by a housing, which communicates with the chamber within the classifying wheel 1027. A second discharge port 1026 is provided on the housing of the bearing seat 1024. During operation, the fine powder produced by classification passes through the chamber in the middle of the classifying wheel 1027 and the bearing seat 1024, and then enters the collection device through the second discharge port 1026. Furthermore, the speed of the classifying wheel 1027 in this embodiment is variable frequency adjustable. When the speed of the classifying wheel 1027 increases, the particle size of the fine powder entering the collection device decreases. When the speed of the classifying wheel 1027 decreases, the particle size of the fine powder entering the collection device increases.

[0060] like Figure 7 As shown, in one embodiment, the airflow classification device 100 further includes a feed assembly 105, wherein the feed assembly 105 includes a straight tube 1051 and a funnel 1052. Specifically, one end of the straight tube 1051 is sealed, and the other end is inserted into the feed port 1014 and fixedly connected to the cylinder 101. The straight tube 1051 is provided with a circular hole that communicates with the internal receiving cavity. The funnel 1052 is inserted into the circular hole and is welded to the straight tube 1051. During use, the material enters the receiving cavity of the straight tube 1051 through the funnel 1052, and then enters the cylinder 101 under the action of the fan 103 for classification.

[0061] In one embodiment, the airflow classification apparatus 100 further includes a fan shutoff fan 104, which is connected to the first discharge port 1016. Specifically, a hollow cylindrical sleeve 1017 is welded to the end of the conical section 1015 away from the straight section 1011. The sleeve 1017 forms the first discharge port. A flange 1041 is welded to the end of the sleeve 1017 away from the conical section 1015. The inlet of the fan shutoff fan 104 is welded to the flange 1041 along the tangent direction of the sleeve 1017.

[0062] After the classification process is completed, the coarse particle material will move downward along the cone section 1015 and eventually reach the position of the fan 104. Then, when the rotatable blades 1029 inside the fan 104 rotate to align with the cone discharge port, the material will be guided out of the cylinder 101.

[0063] Those skilled in the art will appreciate that some of the connection methods in the above solutions may be connected using other fixing methods other than welding.

[0064] The airflow classification equipment provided by this solution does not require multiple air intakes or the installation of multiple classification wheels, and has a simple structure. In addition, on the basis of side feeding, this solution also provides a drive assembly and a classification wheel, so that the material rotates and moves downward along the inner circumferential wall of the cylinder under the action of the centrifugal force generated by the classification wheel and its own gravity for classification. Also, because the movement direction of the material in the cylinder in this solution is opposite to the direction of the centrifugal airflow generated by the rotation of the classification wheel, the material stays in the classification area for a long time, so that the reverse airflow generated by the rotation of the classification wheel can be fully utilized for collision and deagglomeration. This solution can not only classify materials with large particle sizes, but also classify materials with small particle sizes, especially for small particle sizes ranging from greater than or equal to 1.0μm to less than or equal to 2.0μm. It has a good classification effect.

[0065] The above describes in detail the airflow classifying device 100 in the airflow classifying apparatus 400 . Next, other structures in the airflow classifying apparatus will be described in detail.

[0066] like Figure 8 As shown, in one embodiment, the airflow classification device 400 further includes a dust collector 200, and a second blower 201 is provided at the lower end of the dust collector 200. Specifically, the feed port of the dust collector 200 is connected to the second discharge port 1026 via a pipeline, and the discharge port of the dust collector 200 is connected to the blower 103 via a pipeline. In other words, the blower 103 is connected to the cylinder 101 via the dust collector 200.

[0067] During use, the fine powder generated during the classification process enters the dust collector 200 through the classifying wheel 1027 and the bearing seat 1024 under the action of negative pressure and induced draft, and gas-solid separation is carried out in the dust collector 200. The clean air is discharged from the device through the fan 103, and the fine powder is discharged from the device through the second-gate fan 201 at the lower end of the dust collector 200.

[0068] The dust collector of this solution can be a bag dust collector, a filter element dust collector, a filter plate dust collector, etc. It will be understood by those skilled in the art that the dust collectors listed above are exemplary and non-limiting, and other equipment with dust removal functions can also be used in production.

[0069] In one embodiment, the airflow classifier 400 further includes a feeder 300 having a feed port and a discharge port, wherein the discharge port is located above the funnel 1052 in the feed assembly 105. During use, the material can be uniformly and continuously fed into the funnel 1052 through the feeder 300, then enter the straight pipe 1051 through the funnel 1052, and finally enter the barrel under the action of the fan 103 for classification.

[0070] The feeder of this solution can be a screw feeder, a vibrating feeder, a disc feeder, etc. It will be understood by those skilled in the art that the feeders listed above are exemplary rather than restrictive, and other equipment with a feeding function can also be used in production.

[0071] In one embodiment, N airflow classifying devices are connected in series in the airflow classifying apparatus, where N is a positive integer greater than or equal to 1. Specifically, a plurality of airflow classifying devices 100 are connected in series between the feeder 300 and the dust collector 200 of the airflow classifying apparatus.

[0072] More specifically, if Figure 9 As shown, two airflow classifying devices 100 are connected in series between the airflow classifying device feeder 300 and the dust collector 200 provided in this embodiment, so that products with multiple particle size ranges can be classified.

[0073] During use, the speed of the classifying wheel in the airflow classifier connected to the feeder is controlled to perform coarse classification within the airflow classifier. The airflow classifier connected to the dust collector is then adjusted to perform fine classification within the airflow classifier. This solution allows for multiple particle classifications based on user needs, further improving particle classification accuracy.

[0074] Although multiple embodiments of the present application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present application. It should be understood that in the process of practicing the present application, various alternatives to the embodiments of the present application described herein can be adopted. The accompanying claims are intended to define the scope of protection of the present application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An airflow classification device, comprising a feed assembly, an airflow classification device, a dust collector and a fan connected in sequence, characterized in that: The airflow classification equipment comprises: The cylinder comprises a cylindrical straight section and a conical tapered section connected to each other, wherein a feed port connected to the feed assembly is provided on the circumferential wall of the upper end of the straight section, and a first discharge port is provided at one end of the tapered section away from the straight section; a drive assembly disposed above the straight tube section, and having a second discharge port on the drive assembly, wherein the second discharge port is respectively connected to the straight tube section and the dust collector; and A grading wheel is arranged in the straight cylinder section and is communicated with the second discharge port.

2. The airflow classification device according to claim 1, characterized in that In a longitudinal section along the length direction of the feed port, at least one contour line of the feed port is tangent to the contour line of the inner wall of the cylinder.

3. The airflow classification device according to claim 2, characterized in that: The center point of the feed port and the center point of the classifying wheel are located on a horizontal line.

4. The airflow classification device according to claim 1, characterized in that: The rotation direction of the classifying wheel is opposite to the movement direction of the material after entering the cylinder.

5. The airflow classification device according to any one of claims 1 to 4, characterized in that: The ratio of the height h1 of the grading wheel to the height h2 of the feed port is in the range of 0.3 to 1.

6. The airflow classification device according to any one of claims 1 to 4, characterized in that: The grading wheel is cylindrical; The ratio of the diameter D of the straight cylindrical section to the outer diameter d1 of the classifying wheel is in the range of 1.5 to 3.

7. The airflow classification device according to any one of claims 1 to 4, characterized in that: The ratio of the height L1 of the straight tube section to its diameter D is in the range of 1 to 2.

5.

8. The airflow classification device according to any one of claims 1 to 4, characterized in that: The ratio of the height L2 of the tapered section to the diameter D of the straight section is in the range of 1.5 to 2.

5.

9. The airflow classification device according to any one of claims 1 to 4, characterized in that: The ratio of the diameter d2 of the through hole on the end cover of the straight tube section to the diameter D of the straight tube section is in the range of 0.25 to 0.

45.

10. The airflow classification device according to claim 1, characterized in that: N airflow classification devices are connected in series in the airflow classification apparatus, where N is a positive integer greater than or equal to 1.

Images