A lithium iron phosphate high-efficiency airflow classifier

Abstract

A lithium iron phosphate high-efficiency airflow classifier belongs to the technical field of using airflow and centrifugal force to classify and screen solid materials. The classifier includes: a shell, and a classifying impeller is arranged inside it. The airflow classifier also includes: a feed pipe, an air intake pipe and a centrifugal disc. The feed pipe is arranged in the shell; the air intake pipe is arranged in the feed pipe, and the side wall of the lower end thereof is provided with an air jet hole, and the side wall of the air intake pipe is provided with a rotating blade; the centrifugal disc is coaxially arranged at the lower end of the air intake pipe and is located below the air jet hole. There is a predetermined interval between the top surface of the centrifugal disc and the bottom plate of the classifying impeller, and a plurality of convex strips are arranged along the circumferential array on the top surface of the centrifugal disc; the classifying impeller is arranged outside the feed pipe, and a transmission mechanism is arranged between the air intake pipe and the classifying impeller. A driver is arranged on the top of the feed pipe for driving the air intake pipe to rotate, and the air intake pipe drives the classifying impeller to rotate through the transmission mechanism. This scheme can effectively prevent the agglomerated lithium iron phosphate from accumulating inside the classifier, which helps to improve the classification efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of grading and screening solid materials by utilizing airflow and centrifugal force, and in particular relates to a lithium iron phosphate high-efficiency airflow classifier. Background Art

[0002] Lithium iron phosphate is an important lithium battery electrode material. Its solid material is mainly prepared by mixing, grinding, drying, sintering, crushing, screening and other processes using raw materials such as iron phosphate, lithium carbonate and glucose. The intermediate product after sintering is easy to form agglomerates under high temperature. An invention patent applied for by the applicant in the early stage, with application number 202310799537.8, specifically discloses an airflow classification device, which includes a shell, an impeller assembly, a first funnel, an annular trough and a feed pipe, etc. During production, the lithium iron phosphate solid material is input into the annular trough from the feed pipe and discharged downward from the discharge hole. During the test, it was found that the slightly larger agglomerated materials after agglomeration were difficult to be discharged smoothly from the material hole below the annular trough. After the equipment has been running for a period of time, the annular trough will be filled with agglomerated materials. Although a scraper was initially set to push the material inside the annular trough, most of the time it could only push the agglomerated materials to rotate in the annular trough, and could not make the agglomerated materials fall smoothly. Due to the above-mentioned feeding problems, it is difficult to improve the classification efficiency of lithium iron phosphate. In order to solve the above problems, a new airflow classification device is proposed, which can pre-break up the agglomerated materials during the feeding stage. It can effectively prevent the accumulation of feed and ensure the efficiency of airflow classification. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the present invention provides a lithium iron phosphate high-efficiency airflow classifier, which can effectively prevent agglomerated lithium iron phosphate from accumulating inside the classifier, thereby helping to improve the classification efficiency.

[0004] In order to achieve the purpose of the present invention, the following scheme is proposed:

[0005] A lithium iron phosphate high-efficiency airflow classifier comprises: a shell, which comprises an upper cavity and a lower cavity which are connected to each other, a discharge pipe is connected to the side wall of the upper cavity, and a discharge pipe is connected to the end of the discharge pipe to connect to a cyclone collector, and a classifying impeller is arranged in the lower cavity, and a top of the impeller is connected to the upper cavity.

[0006] The airflow classifier also includes: a feed pipe, an air inlet pipe and a centrifugal disc.

[0007] The feed pipe is vertically arranged in the shell, and the side wall of the feed pipe is connected to the top of the shell corresponding to the feed connection pipe. The top of the feed pipe is a closed structure, and the bottom is an open structure, and the bottom opening extends into the lower cavity;

[0008] The air inlet pipe is coaxially arranged in the feed pipe, the upper end of the air inlet pipe protrudes from the top of the feed pipe, the side wall of the lower end of the air inlet pipe is provided with an air jet hole, and the side wall of the air inlet pipe is provided with a rotating blade;

[0009] The centrifugal disc is coaxially arranged at the lower end of the air inlet pipe and is located below the air jet hole. There is a predetermined interval between the top surface of the centrifugal disc and the bottom plate of the grading impeller. The top surface of the centrifugal disc is provided with a plurality of convex strips along the circumference array, and the length direction thereof is consistent with the radial direction of the centrifugal disc.

[0010] The classifying impeller is coaxially sleeved on the outside of the lower end of the feed pipe, a transmission mechanism is provided between the air inlet pipe and the classifying impeller, and a driver is provided on the top of the feed pipe for driving the air inlet pipe to rotate. The air inlet pipe drives the classifying impeller to rotate through the transmission mechanism.

[0011] The beneficial effects of the present invention are:

[0012] 1. The air intake pipe is inserted into the feed pipe to save installation space of the air intake pipe, making the interior of the classifier more compact, and rotating blades are arranged on the side wall of the air intake pipe to break up the lithium iron phosphate entering the feed pipe, thereby preventing the agglomerated lithium iron phosphate from accumulating in the feed pipe.

[0013] 2. While the lithium iron phosphate is thrown out by the centrifugal disk, the lithium iron phosphate is dispersed again, thereby improving the dispersion effect of the lithium iron phosphate, thereby ensuring the classification efficiency and improving the output rate of the lithium iron phosphate after sintering.

[0014] 3. The centrifugal disc and the classifying impeller are driven simultaneously by the air inlet pipe, making the driving scheme of the classifier simpler and the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0016] Figure 1 A schematic diagram of the overall external structure of the present application is shown.

[0017] Figure 2 A schematic diagram of the internal structure of the present application is shown.

[0018] Figure 3 Shows Figure 2 A partial enlarged view of point A in the middle.

[0019] Figure 4 A schematic diagram of the bottom structure of the grading impeller is shown.

[0020] Figure 5 A schematic diagram of the structure of the air intake pipe and the centrifugal disk is shown.

[0021] Figure 6An overall cross-sectional view of the present application is shown.

[0022] Figure 7 Shows Figure 6 A partial enlarged view of point B in the middle.

[0023] Markings in the figure: shell -1, upper cavity -11, lower cavity -12, discharge pipe -13, funnel -14, feed pipe -2, feed connecting pipe -21, idler -22, circular tube -23, grading impeller -3, bottom plate -31, inner gear ring -32, sealing plate -33, guide ring -34, annular groove -341, conical surface -342, wear-resistant strip -343, air intake pipe -4, jet hole -41, rotating blade -42, outer gear ring -43, centrifugal disc -5, convex strip -51, inner ring groove -52, first outer side wall -521, first inner side wall -522, outer ring groove -53, second outer side wall -531, second inner side wall -532, discharge gap -533, annular protrusion -54, feed gap -541, driver -6. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Embodiment 1, as Figure 1 , Figure 2 As shown, a lithium iron phosphate high-efficiency airflow classifier comprises: a shell 1, which comprises an upper cavity 11 and a lower cavity 12 which are interconnected, a discharge pipe 13 is connected to the side wall of the upper cavity 11, and a discharge pipe 13 is provided at the end thereof for connecting to a cyclone collector, a classifying impeller 3 is provided in the lower cavity 12, and a top thereof is connected to the upper cavity 11, and a rotating sealing structure is adopted between the outer peripheral side of the upper end of the classifying impeller 3 and the inner wall of the lower end of the upper cavity 11.

[0026] like Figures 2 to 7 As shown, the lithium iron phosphate high-efficiency airflow classifier also includes: a feed pipe 2, an air intake pipe 4 and a centrifugal disc 5.

[0027] The feed pipe 2 is vertically penetrated through the shell 1 , and a feed connecting pipe 21 is provided on the side wall of the feed pipe 2 corresponding to the upper part of the shell 1 . The top of the feed pipe 2 is a closed structure, and the bottom is an open structure for dropping materials, and the bottom opening extends into the lower cavity 12 .

[0028] The air intake pipe 4 is coaxially arranged in the feed pipe 2, the upper end of the air intake pipe 4 protrudes from the top of the feed pipe 2, the top of the air intake pipe 4 is connected to the air pump through a rotating structure and a pipeline, the side wall of the lower end of the air intake pipe 4 is provided with an injection hole 41, and the side wall of the air intake pipe 4 is provided with a rotating blade 42 for breaking up the agglomerated lithium iron phosphate.

[0029] The centrifugal disc 5 is coaxially arranged at the lower end of the air inlet pipe 4 and is located below the air jet hole 41. There is a predetermined interval between the top surface of the centrifugal disc 5 and the bottom plate 31 of the classifying impeller 3, which is used to disperse the broken material outward, that is, the lithium iron phosphate powder. The top surface of the centrifugal disc 5 is provided with a plurality of convex strips 51 along the circumferential array, and the length direction of the convex strips 51 is consistent with the radial direction of the centrifugal disc 5. When the centrifugal disc 5 disperses the material outward, the centrifugal force of the material can be increased, so that the material can be dispersed outward faster and more dispersed.

[0030] The classifying impeller 3 is coaxially sleeved on the outside of the lower end of the feed pipe 2, a transmission mechanism is provided between the air inlet pipe 4 and the classifying impeller 3, a driver 6 is provided on the top of the feed pipe 2 for driving the air inlet pipe 4 to rotate, and the air inlet pipe 4 drives the classifying impeller 3 to rotate through the transmission mechanism.

[0031] The principle of using the above scheme to perform airflow classification on the agglomerated lithium iron phosphate after sintering is as follows: the agglomerated lithium iron phosphate is fed into the feed pipe 2 through the feed connection pipe 21, and the driver 6 drives the air intake pipe 4 to rotate, so as to use the rotating blades 42 provided on the air intake pipe 4 to preliminarily break up the agglomerated lithium iron phosphate to prevent the lithium iron phosphate from accumulating inside the feed pipe 2. The lithium iron phosphate that has been preliminarily broken up automatically falls on the centrifugal disk 5, and the centrifugal disk 5 rotates together with the air intake pipe 4. The lithium iron phosphate that falls on the centrifugal disk 5 is rapidly dispersed outward along the circumference under the centrifugal force when the centrifugal disk 5 rotates, and under the action of the airflow ejected from the air jet hole 41, and is thrown out from the gap between the centrifugal disk 5 and the bottom plate 31. In the process of lithium iron phosphate being thrown outward by the centrifugal disk 5, the convex strips 51 play a major role in promoting the lithium iron phosphate material, providing sufficient centrifugal force for the lithium iron phosphate, so that the lithium iron phosphate is thrown outward more dispersedly, and the convex strips 51 also play a role in further breaking up the lithium iron phosphate to prevent the rotating blades 42 from missing it during the preliminary breaking up. Under the suction of the discharge pipe 13, after the lithium iron phosphate is thrown out from between the centrifugal disk 5 and the bottom plate 31, it will rise upward, and then the lithium iron phosphate will be classified by the grading impeller 3. The particles with qualified particle size will enter the grading impeller 3 through the gap between the blades of the grading impeller 3, and then enter the upper cavity 11 from the top of the grading impeller 3, and then be discharged from the discharge pipe 13, and finally the lithium iron phosphate will be collected by the cyclone collector; this scheme uses the rotating blades 42 and the convex strips 51 to break up the agglomerated lithium iron phosphate twice, which has a good breaking up effect, and can prevent the agglomerated lithium iron phosphate from accumulating in the feed pipe 2, which helps to improve the classification efficiency.

[0032] As a preferred solution, Figure 2 , Figure 6As shown, the driver 6 is a reduction motor, and the upper end of the intake pipe 4 rotates through the rotation center of the driver 6. As another preferred solution, the intake pipe 4 can be driven to rotate by chain drive, belt drive or mutually meshing gear drive. Specifically, the upper end of the intake pipe 4 is coaxially inserted into a sprocket in the chain drive structure, and the other sprocket is driven by a motor; the upper end of the intake pipe 4 can also be coaxially inserted into a pulley in the belt drive structure, and the other pulley is driven by a motor; or the upper end of the intake pipe 4 is coaxially inserted into a gear in the gear drive structure, and the other gear is driven by a motor.

[0033] Preferably, Figure 5 As shown, a plurality of layers of rotating blades 42 are provided on the outer wall of the air intake pipe 4, and the distance between the distal end of the upper layer of rotating blades 42 and the axis of the air intake pipe 4 is smaller than the distance between the distal end of the lower layer of rotating blades 42 and the axis of the air intake pipe 4. This structural design is to adapt to the large volume of lithium iron phosphate agglomerates when the lithium iron phosphate is just put into the feed pipe 2, and to prevent the agglomerated lithium iron phosphate from getting stuck in the rotating blades 42; and in the feed pipe 2, the volume of the agglomerates will be smaller as they go down, and the rotating blades 42 with larger lengths can further break up the agglomerated lithium iron phosphate, thereby improving the breaking efficiency.

[0034] As a further preferred structure, the angles between each layer of rotating blades 42 and the axis of the air inlet pipe 4 are different, so as to improve the effect of breaking up the agglomerates by using rotating blades 42 at different angles.

[0035] Preferably, Figure 2 , Figure 6 As shown, a funnel 14 is provided on the inner wall of the feed pipe 2 corresponding to the lower portion of each layer of rotating blades 42 for gathering the lithium iron phosphate dispersed by the upper rotating blades 42 to the middle portion, thereby helping the lower rotating blades 42 to disperse the lithium iron phosphate.

[0036] Embodiment 2, as Figures 3 to 5 and Figure 7 As shown, the transmission mechanism recorded in Example 1 includes an outer gear ring 43 coaxially arranged at the lower end of the intake pipe 4, an idler wheel 22 arranged at the lower end of the feed pipe 2, and an inner gear ring 32 coaxially arranged below the bottom plate 31 of the classification impeller 3; the outer gear ring 43 is connected to the intake pipe 4 through a plurality of spokes, the inner diameter of the outer gear ring 43 is larger than the inner diameter of the feed pipe 2, and the idler wheel 22 meshes with the outer gear ring 43 and the inner gear ring 32. When the intake pipe 4 rotates, the outer gear ring 43 will rotate together with the intake pipe 4, thereby driving the inner gear ring 32 and the classification impeller 3 to rotate through the idler wheel 22. By adopting the above transmission scheme, not only can the intake pipe 4 be used to synchronously drive the classification impeller 3 to rotate, but the transmission structure is simpler and only one driving element is required, which can effectively reduce energy consumption and equipment manufacturing costs, and will not affect the feeding of the feed pipe 2.

[0037] Preferably, Figure 3 As shown, a circular tube 23 is provided at the lower end of the feed pipe 2 extending downward, and the upper end of the outer gear ring 43 is rotatably sleeved on the outside of the circular tube 23 to improve the stability of the installation position of the outer gear ring 43 and prevent the intake pipe 4 from being eccentric when rotating, because only one side of the outer gear ring 43 bears the torque transmitted by the idler wheel 22; a sealing plate 33 of a circular ring structure is provided on the lower end face of the inner gear ring 32, and a rotating sealing structure is provided between the top surface of the inner side of the sealing plate 33 and the bottom surface of the outer gear ring 43. By setting the sealing plate 33, the connection between the idler wheel 22 and the outer gear ring 43 and the inner gear ring 32 can be closed to prevent lithium iron phosphate from entering the transmission area, improve the stability of the equipment operation, and prevent impurities generated by the transmission mechanism from mixing into the lithium iron phosphate. Although a magnetic de-ironization process will be set before packaging in the later process, it is also necessary to try to avoid impurities from mixing in the production process at each stage; specifically, the rotating sealing structure can be achieved by a rubber sealing ring coaxially arranged below the outer gear ring 43.

[0038] Embodiment 3, as Figure 7 As shown, on the basis of Example 1, an inner annular groove 52 and an outer annular groove 53 are coaxially formed on the top surface of the centrifugal disk 5, the diameter of the inner annular groove 52 is smaller than that of the outer annular groove 53, an annular protrusion 54 is formed between the inner annular groove 52 and the outer annular groove 53, the cross-sections of the inner annular groove 52 and the outer annular groove 53 are both V-shaped structures, the two side surfaces of the inner annular groove 52 are respectively a first outer side wall 521 and a first inner side wall 522, wherein the first inner side wall 522 not only forms an inner annular groove 52 with a V-shaped cross-section with the first outer side wall 521, but also prevents lithium iron phosphate from accumulating in the middle of the centrifugal disk 5, the two side surfaces of the outer annular groove 53 are respectively a second outer side wall 531 and a second inner side wall 532, the first outer side wall 521 and the second outer side wall 531 are both inclined toward the upper side of the axis of the centrifugal disk 5, the first inner side wall 522 and the second inner side wall 532 are both inclined toward the upper side of the outer side of the centrifugal disk 5, and the convex strip 51 is provided on the first outer side wall 521.

[0039] A guide ring 34 with a circular structure is provided at the bottom of the bottom plate 31, and a feeding gap 541 with a circular structure is formed between the inner edge of the bottom surface of the guide ring 34 and the annular protrusion 54, and a discharge gap 533 with a circular structure is formed between the outer edge of the bottom surface of the guide ring 34 and the second outer side wall 531, and the height of the feeding gap 541 is greater than the height of the discharge gap 533.

[0040] After adopting the above design scheme, after the lithium iron phosphate falls from the feed pipe 2, under the action of the centrifugal force of the centrifugal disk 5 during rotation and the airflow ejected from the air jet hole 41, the lithium iron phosphate will smoothly enter the inner annular groove 52, and then under the action of the first outer side wall 521, the lithium iron phosphate will be thrown up for the first time, and will be further broken up by the convex strips 51 during the first throwing up. At the same time, under the impact of the convex strips 51 and the action of the airflow, most of the lithium iron phosphate will pass through the feed gap 541, and a small amount of lithium iron phosphate that has not been broken up will not easily pass through the feed gap 541 due to its large volume; the lithium iron phosphate that has passed through the feed gap 541 will enter the outer annular groove 53, and then Under the action of the second outer wall 531, the lithium iron phosphate is thrown up for the second time and discharged from the discharge gap 533. Because the inclination angle of the second outer wall 531 is set upward, the lithium iron phosphate thrown up for the second time will move upward, so that the lithium iron phosphate is closer to the working area of ​​the grading impeller 3, so that the lithium iron phosphate can be quickly graded through the grading impeller 3 to improve the grading efficiency. The present scheme sets a guide ring 34 and makes the height of the feed gap 541 greater than the height of the discharge gap 533. The purpose is to use the guide ring 34 and the centrifugal disk 5 to compress the lithium iron phosphate to be discharged, so that the lithium iron phosphate thrown up for the second time is more dispersed to improve the grading efficiency.

[0041] Embodiment 4, as Figures 2 to 7 As shown, the transmission mechanism recorded in Example 1 includes an outer gear ring 43 coaxially arranged at the lower end of the intake pipe 4, an idler wheel 22 arranged at the lower end of the feed pipe 2, and an inner gear ring 32 coaxially arranged below the bottom plate 31 of the classifying impeller 3; the outer gear ring 43 is connected to the intake pipe 4 through a plurality of spokes, the inner diameter of the outer gear ring 43 is larger than the inner diameter of the feed pipe 2, and the idler wheel 22 is meshed with the outer gear ring 43 and the inner gear ring 32.

[0042] An inner annular groove 52 and an outer annular groove 53 are coaxially formed on the top surface of the centrifugal disk 5. The diameter of the inner annular groove 52 is smaller than that of the outer annular groove 53. An annular protrusion 54 is formed between the inner annular groove 52 and the outer annular groove 53. The cross-sections of the inner annular groove 52 and the outer annular groove 53 are both V-shaped structures. The two side surfaces of the inner annular groove 52 are respectively a first outer side wall 521 and a first inner side wall 522. The two side surfaces of the outer annular groove 53 are respectively a second outer side wall 531 and a second inner side wall 532. The first outer side wall 521 and the second outer side wall 531 are both inclined toward the upper side of the axis of the centrifugal disk 5. The first inner side wall 522 and the second inner side wall 532 are both inclined toward the upper side of the outer side of the centrifugal disk 5. The convex strip 51 is provided on the first outer side wall 521.

[0043] A guide ring 34 with a circular structure is provided at the bottom of the bottom plate 31, and a feeding gap 541 with a circular structure is formed between the inner edge of the bottom surface of the guide ring 34 and the annular protrusion 54, and a discharge gap 533 with a circular structure is formed between the outer edge of the bottom surface of the guide ring 34 and the second outer side wall 531, and the height of the feeding gap 541 is greater than the height of the discharge gap 533.

[0044] After adopting this scheme, the lithium iron phosphate will pass through the feed gap 541 and the discharge gap 533 during the process of being discharged from between the centrifugal disk 5 and the bottom plate 31, and will experience two throwings. During the first throwing, the lithium iron phosphate will continue to be broken up, and a screening process will be achieved by using the feed gap 541 to isolate the unbroken lithium iron phosphate in the inner ring groove 52. This is because even if this part of the lithium iron phosphate is discharged, it cannot pass the classification of the grading impeller 3 and can only fall to the bottom of the shell 1. It will either be returned for re-classification or treated as waste. This method will reduce the unit qualified rate of lithium iron phosphate, increase production costs or cause waste; the second throwing will make the lithium iron phosphate more dispersed and closer to the grading impeller 3, thereby improving the classification efficiency. On the other hand, in the grading process of the present scheme, the centrifugal disk 5 and the guide ring 34 rotate in opposite directions, which effectively increases the contact and collision probability between the lithium iron phosphate and the centrifugal disk 5 and the guide ring 34, thereby further breaking up the clumps that have not been completely dispersed, and the lithium iron phosphate discharged from the discharge gap 533 will form two layers, one layer close to the bottom surface of the guide ring 34, and the other layer close to the surface of the second outer wall 531, so that the state of the lithium iron phosphate when discharged is more dispersed; and the two layers of lithium iron phosphate are thrown in opposite directions, which will further improve the dispersion effect.

[0045] Further preferably, Figure 7 As shown, the bottom surface of the guide ring 34 has an annular groove 341, which forms an annular cavity with the second inner side wall 532, and the inner and outer sides of the annular cavity are respectively connected to the feed gap 541 and the discharge gap 533, and the height of the annular cavity is greater than the height of the feed gap 541; the annular cavity is used to form a material mixing area and a pressurization space between the centrifugal disk 5 and the guide ring 34; the annular cavity can make the lithium iron phosphate entering therein more evenly distributed along the circumference, so that the lithium iron phosphate discharged from the discharge gap 533 is more evenly distributed along the circumference, which helps to improve the classification efficiency of the classification impeller 3 and avoid the lithium iron phosphate from forming a local aggregation area in the classification impeller 3; under the action of the jet hole 41, the annular cavity will form a pressurization space, because the gap height of the discharge gap 533 is small, so the speed of the lithium iron phosphate passing through the discharge gap 533 will be increased, thereby increasing the speed of the lithium iron phosphate when it is thrown out, making it more dispersed, rising higher, and easier to enter the working area of ​​the classification impeller 3.

[0046] Further preferably, Figure 4 , Figure 7 As shown, the inner wall of the guide ring 34 is a conical surface 342, and the extension trajectory of the first outer side wall 521 to the outside intersects with the conical surface 342. When the centrifugal disk 5 rotates, the lithium iron phosphate that has not been broken up will be thrown higher due to its greater weight and thus the centrifugal force. Therefore, the lithium iron phosphate that has not been broken up will collide with the conical surface 342, thereby breaking up the lithium iron phosphate and preventing the lithium iron phosphate that has not been broken up from being accumulated in the inner ring groove 52.

[0047] Further preferably, Figure 4 , Figure 7 As shown, a wear-resistant strip 343 is provided on the conical surface 342 to improve the effect of breaking up the lithium iron phosphate.

[0048] The above description is only a preferred embodiment of the present invention, and is not intended to be the only one or to limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A lithium iron phosphate high-efficiency airflow classifier, comprising a housing (1), which comprises an upper cavity (11) and a lower cavity (12) which are interconnected, a discharge pipe (13) being provided in communication with the side wall of the upper cavity (11), the end of which is used to connect to a cyclone collector, a classifying impeller (3) being provided in the lower cavity (12), the top of which is in communication with the upper cavity (11), and characterized in that: The air classifier also includes: A feed pipe (2) is vertically arranged through the shell (1), a side wall of the feed pipe (2) corresponding to the upper side of the shell (1) is connected to a feed connection pipe (21), the top of the feed pipe (2) is a closed structure, the bottom is an open structure, and the bottom opening extends into the lower cavity (12); An air intake pipe (4) is coaxially arranged in the feed pipe (2), the upper end of the air intake pipe (4) protrudes from the top of the feed pipe (2), a jet hole (41) is formed on the side wall of the lower end of the air intake pipe (4), and a rotating blade (42) is formed on the side wall of the air intake pipe (4); A centrifugal disc (5) is coaxially arranged at the lower end of the air inlet pipe (4) and is located below the air injection hole (41); a predetermined interval is provided between the top surface of the centrifugal disc (5) and the bottom plate (31) of the classification impeller (3); and a plurality of convex strips (51) are provided on the top surface of the centrifugal disc (5) in a circumferential array, the length direction of which is consistent with the radial direction of the centrifugal disc (5); The classifying impeller (3) is coaxially sleeved on the outside of the lower end of the feed pipe (2); a transmission mechanism is provided between the air intake pipe (4) and the classifying impeller (3); a driver (6) is provided on the top of the feed pipe (2) for driving the air intake pipe (4) to rotate; the air intake pipe (4) drives the classifying impeller (3) to rotate through the transmission mechanism; An inner annular groove (52) and an outer annular groove (53) are coaxially formed on the top surface of the centrifugal disk (5), the diameter of the inner annular groove (52) being smaller than that of the outer annular groove (53), an annular protrusion (54) being formed between the inner annular groove (52) and the outer annular groove (53), the cross sections of the inner annular groove (52) and the outer annular groove (53) both being V-shaped structures, the two side surfaces of the inner annular groove (52) being respectively a first outer side wall (521) and a first inner side wall (522), the two side surfaces of the outer annular groove (53) being respectively a second outer side wall (531) and a second inner side wall (532), the first outer side wall (521) and the second outer side wall (531) both being inclined toward the upper side of the axis of the centrifugal disk (5), the first inner side wall (522) and the second inner side wall (532) both being inclined toward the upper side of the outer side of the centrifugal disk (5), and the convex strip (51) being provided on the first outer side wall (521); A guide ring (34) with a circular structure is provided at the bottom of the bottom plate (31); a feeding gap (541) with a circular structure is formed between the inner edge of the bottom surface of the guide ring (34) and the annular protrusion (54); a discharge gap (533) with a circular structure is formed between the outer edge of the bottom surface of the guide ring (34) and the second outer side wall (531); and the height of the feeding gap (541) is greater than the height of the discharge gap (533).

2. A lithium iron phosphate high-efficiency airflow classifier according to claim 1, characterized in that: The driver (6) is a reduction motor, and the upper end of the air intake pipe (4) rotates through the rotation center of the driver (6).

3. A lithium iron phosphate high-efficiency airflow classifier according to claim 1, characterized in that: A plurality of rotating blades (42) are provided on the outer wall of the air inlet pipe (4), and the distance between the distal end of the rotating blades (42) of an upper layer and the axis of the air inlet pipe (4) is smaller than the distance between the distal end of the rotating blades (42) of a lower layer and the axis of the air inlet pipe (4).

4. A lithium iron phosphate high-efficiency airflow classifier according to claim 3, characterized in that: A funnel (14) is provided on the inner wall of the feed pipe (2) below each layer of rotating blades (42).

5. A lithium iron phosphate high-efficiency airflow classifier according to claim 1, characterized in that: The transmission mechanism comprises an outer gear ring (43) coaxially arranged at the lower end of the intake pipe (4), an idler wheel (22) arranged at the lower end of the feed pipe (2), and an inner gear ring (32) coaxially arranged below the grading impeller (3); the outer gear ring (43) is connected to the intake pipe (4) via a plurality of spokes, the inner diameter of the outer gear ring (43) is larger than the inner diameter of the feed pipe (2), and the idler wheel (22) meshes with the outer gear ring (43) and the inner gear ring (32).

6. A lithium iron phosphate high-efficiency airflow classifier according to claim 5, characterized in that: A circular tube (23) is provided at the lower end of the feed pipe (2) extending downward, and the upper end of the outer gear ring (43) is rotatably sleeved on the outside of the circular tube (23); a sealing plate (33) with a circular ring structure is provided on the lower end surface of the inner gear ring (32), and a rotating sealing structure is provided between the top surface of the inner side of the sealing plate (33) and the bottom surface of the outer gear ring (43).

7. A lithium iron phosphate high-efficiency airflow classifier according to claim 1, characterized in that: The bottom surface of the guide ring (34) has an annular groove (341), which forms an annular cavity with the second inner wall (532); the inner and outer sides of the annular cavity are respectively connected to the feed gap (541) and the discharge gap (533); and the height of the annular cavity is greater than the height of the feed gap (541).

8. A lithium iron phosphate high-efficiency airflow classifier according to claim 1, characterized in that: The inner wall of the guide ring (34) is a conical surface (342), and the extension trajectory of the first outer side wall (521) intersects with the conical surface (342).

9. A lithium iron phosphate high-efficiency airflow classifier according to claim 8, characterized in that: A wear-resistant strip (343) is provided on the conical surface (342).

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