CN211190982U

CN211190982U - Superfine powder grader

Info

Publication number: CN211190982U
Application number: CN201922240824.7U
Authority: CN
Inventors: 徐中州; 吕海峰
Original assignee: Jiangsu Jinengda Enviroment Energy Technology Co ltd
Current assignee: Jiangsu Jinengda Enviroment Energy Technology Co ltd
Priority date: 2019-12-14
Filing date: 2019-12-14
Publication date: 2020-08-07
Anticipated expiration: 2029-12-14

Abstract

The utility model discloses an ultrafine powder grader, which comprises a shell, a grading rotor, a wind guide vane group, a driving device, a transmission shaft, a feeding and distributing device, a wind guide cone, a flushing and dispersing device, a coarse powder collecting device and a wind inlet pipe, wherein the feeding and distributing device is arranged on a lower annular plate of the grading rotor, the wind guide cone is positioned below the lower end of the transmission shaft, the wind guide cone is arranged in the shell through a support rod, the flushing and dispersing device comprises an air inlet pipe, the upper part of the flushing and dispersing device is arranged at the lower end of the shell, the lower part of the flushing and dispersing device is connected with the upper part of the coarse powder collecting device, the upper end of the wind inlet pipe penetrates through the coarse powder collecting device and the flushing and dispersing device and is positioned in the shell, the upper end of the wind inlet pipe is positioned below the wind guide cone, the lower end of, the upper part of the shell is provided with a plurality of air outlets. The utility model discloses not only the classification accuracy is high, and classification efficiency is high, output is big moreover.

Description

Superfine powder grader

Technical Field

The utility model relates to an ultrafine powder grading plant specifically is an ultrafine powder grader.

Background

The technical research of the ultrafine powder has become a new hot subject, and according to the current situation and the national conditions, the powder with the particle size of less than 30um is called the ultrafine powder. The superfine powder has the factors of large surface energy, surface atom number, specific surface area and the like, so that the surface tension of the superfine powder is rapidly increased along with the reduction of the particle size, and the special properties cause that the light, sensitivity, heat, magnetism, inductive characteristics, surface stability and the like of the superfine powder are different from those of common powder, so that the superfine powder has special properties and is widely applied to the fields of automobiles, materials, metallurgy, chemical engineering, compounding, bioengineering, medicine and the like. In particular, in recent years, research and application of ultrafine powder have been rapidly developed, and the ultrafine powder has been applied to almost all high, fine, sharp, and advanced disciplines and fields, and it can be said that the ultrafine powder material has penetrated all industrial fields and high-tech fields. The superfine powder concentrator is one of important devices in the powder preparation industry, and various types of powder concentrators in the current market can sort superfine particles of several microns, but the grading precision and the grading efficiency are not high, the finished product quantity is only 6 tons/hour, and the powder concentrator which can be really used in industrial production at present has high grading precision, large processing capacity and high finished product yield is yet to be developed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a superfine powder grader is provided, this superfine powder grader not only grading accuracy is high, and grading efficiency is high, output is big moreover.

In order to solve the technical problem, the utility model relates to an ultrafine powder grader, contain casing, hierarchical rotor, wind-guiding blade group, drive arrangement, transmission shaft, drive arrangement sets up on the top of casing, the upper end of transmission shaft is located the outside at casing top and links to each other with drive arrangement, the upper end of transmission shaft constitutes to rotate with the top of casing to be connected, the lower extreme of transmission shaft is located the inside of casing, the lower extreme of transmission shaft constitutes to rotate with the support to be connected, the support sets up in the inside of casing; the wind guide blade group forms a circular structure, the upper end of the wind guide blade group is arranged on the upper circular fixing plate, the lower end of the wind guide blade group is arranged on the lower circular fixing plate, and the upper circular fixing plate and the lower circular fixing plate are both arranged in the shell; the grading rotor comprises a fixed frame, a plurality of powder selecting blades, an upper circular plate and a lower circular plate, wherein the upper circular plate and the lower circular plate are respectively arranged at the upper end and the lower end of the fixed frame; the grading rotor is positioned in the wind guide blade group with the circular structure; still contain the pay-off feed divider, the guide cone, wash the dispersion devices, middlings collection device and air inlet pipe, the pay-off feed divider sets up on the lower ring plate of hierarchical rotor, the guide cone is located the below of transmission shaft lower extreme, the guide cone passes through branch setting in the casing, wash the dispersion devices and include the air-supply line, wash the upper portion of dispersion devices and set up on the lower end of casing, it links to each other with the upper portion of middlings collection device to wash the lower part of dispersion devices, the upper end of air inlet pipe passes the middlings collection device and washes the dispersion devices and is located the casing inside, and the upper end of air inlet pipe is located the below of guide cone, the lower extreme of air inlet pipe is located the outside of middlings collection device, be equipped with the feed inlet.

The feeding and distributing device comprises an aggregate cylinder and a plurality of material guiding units, wherein the aggregate cylinder comprises an inner cylinder, an outer cylinder, a circular ring bottom plate and a plurality of material separating plates, the lower end of the inner cylinder and the lower end of the outer cylinder are respectively arranged on the inner hole and the outer periphery of the circular ring bottom plate, the upper end of the inner cylinder is arranged on the lower circular ring plate of the grading rotor, the plurality of material separating plates are respectively and uniformly distributed on the circular ring bottom plate, one end of each material separating plate is arranged on the outer peripheral surface of the inner cylinder, the other end of each material separating plate is arranged on the inner peripheral surface of the outer cylinder, and an opening is formed in the peripheral surface of the outer cylinder at the; the guide unit includes the stock guide, the back striker plate, preceding striker plate and deep bead, the back striker plate sets up on the rear end edge of stock guide, preceding striker plate and deep bead pass through the hinge and constitute articulatedly, preceding striker plate sets up on the rear portion of the front end edge of stock guide, the rear end of stock guide constitutes feed opening with the rear end of back striker plate and the rear end of preceding baffle, feed opening sets up on the opening that is equipped with on the outer barrel is global, the front end of stock guide and the front end of the front striker plate of back striker plate constitute ejection of compact opening, the deep bead can open and close ejection of compact opening.

The lower circular ring-shaped fixing plate is provided with a material blocking ring which is of a cylindrical tube structure, the upper end of the material blocking ring is arranged on the lower circular ring-shaped fixing plate, the lower end of the material blocking ring is located above the upper end of the outer barrel, and the material blocking ring is made of a rubber plate.

The material guide plate is of a triangular structure.

The number of the plurality of material guide units is 6 to 12.

The grading rotor is characterized in that a convex ring is arranged on an upper circular ring plate of the grading rotor, a concave ring is arranged on an upper circular ring fixing plate, the convex ring is matched with the concave ring, and the convex ring is located in the concave ring.

The cross section of the convex ring is rectangular, and the cross section of the concave ring is channel steel.

The flushing and dispersing device comprises a snail shell, a plurality of flushing and dispersing blades, a plurality of cleaning cones and a landing assistant cone, wherein the snail shell comprises a peripheral surface, a top part and a bottom surface, a first air inlet pipe and a second air inlet pipe are respectively arranged on the peripheral surface of the snail shell, the first air inlet pipe and the second air inlet pipe are symmetrical relative to the central line of the snail shell, an upper through hole is arranged on the top surface, a lower through hole is arranged on the bottom surface, an upper feeding pipe is arranged on the upper through hole on the top surface, the center of the upper through hole is superposed with the central line of the snail shell, the flushing and dispersing blades are uniformly distributed in the snail shell, the flushing and dispersing blades form a circular ring shape, an angle is formed between every two adjacent flushing and dispersing blades, the circular ring shape formed by the flushing and dispersing blades is positioned below the through hole on the top surface of the snail shell, the lower end of the circular ring shape formed by the flushing, the large opening of the landing assisting cone is arranged on a lower through hole formed in the bottom surface of the snail shell, the plurality of cleaning cones are of the same structure and are of a hollow round cone structure, the upper end of each cleaning cone is a small opening, the lower end of each cleaning cone is a large opening, the plurality of cleaning cones are arranged at the same interval from top to bottom, the plurality of cleaning cones form an integral structure through connecting strips and are arranged on the snail shell, the plurality of cleaning cones are located in the center of a circular ring formed by the plurality of dispersing blades, the cleaning cone located at the first upper end of each cleaning cone is located in the upper feeding pipe, and the upper feeding pipe is arranged at the lower end of the shell; the upper part of the air inlet feeding pipe is positioned in the centers of the cleaning cones and the landing assistant cones.

The angle formed between two adjacent scattering blades is 10-20 degrees.

The coarse powder collecting device comprises a material guide cylinder and a cone, the large opening of the cone is arranged at the lower end of the material guide cylinder, the lower end of the cone is provided with a coarse powder discharge hole, and the upper end of the material guide cylinder is arranged on the large opening of the landing assistant cone of the flushing and dispersing device; the lower part of the air inlet feeding pipe is positioned in the material guide cylinder and the cone, and the lower end of the air inlet feeding pipe penetrates through the cone and is positioned on the outer side of the cone.

When the ultrafine powder grader is used, a plurality of air outlets arranged on the upper part of the shell are respectively connected with a dust collector, an air blower is connected on an air inlet pipe of the flushing and dispersing device, a fan is connected on an air inlet pipe, the grading rotor rotates under the drive of the transmission shaft, crushed materials enter from a feed inlet of the air inlet pipe, air flow and the materials are mixed to move along the air inlet pipe and reach powder selecting blades of the grading rotor through an air guide cone, a channel formed between the feeding and distributing device and the shell and an air guide blade group, mixed gas obtained after rectification and jet flow dispersion of the materials between the air guide blades and the powder selecting blades forms rotary air flow, coarse powder and fine powder are separated under the action of powerful grading vortex force, fine powder reaching the granularity requirement enters the dust collector along with the air flow through the grading rotor, and. The coarse powder and a small amount of agglomerated fine powder fall into a feeding and distributing device, the feeding and distributing device is driven by a grading rotor to scatter the materials entering the feeding and distributing device towards the inner wall surface of the lower part of a shell, the materials are further dispersed after colliding with the inner wall surface of the shell, particularly the agglomerated fine powder is separated, the separated fine powder enters the grading rotor along with an ascending airflow to be sorted, the rest materials after dispersion spirally descend to a flushing and distributing device along the surface of the shell, the materials are intensively flushed by the spiral centrifugal ascending airflow entering the flushing and distributing device, the agglomerated fine powder is scattered again, the coarse powder and the fine powder are separated again, pure coarse powder is discharged by a coarse powder collecting device, and the fine powder enters a channel formed between the powder collecting device and the shell along with the ascending airflow to reach the grading rotor to be sorted. As can be seen from the above, the materials after being sorted by the grading rotor are firstly dispersed by the feeding and distributing device and then further dispersed after colliding with the inner wall of the shell, and then are intensively washed by the washing and dispersing device, the agglomerated fine powder is broken up again, and the coarse powder and the fine powder are separated again. The ultrafine powder grader sorts, separates, disperses and washes materials, and then sorts, separates again, disperses and washes again, and through the circulation reciprocating, the grading precision is high, the grading efficiency is high, and the yield is large.

Drawings

Fig. 1 is a schematic view of the structure of a micropowder classifier;

FIG. 2 is an enlarged schematic view of the cross-sectional structure A-A in FIG. 1:

FIG. 3 is an enlarged schematic view of the sectional structure of H-H in FIG. 1;

fig. 4 is an enlarged schematic view of the structure of the portion C in fig. 1.

Detailed Description

The technical scheme of the utility model is further explained in detail with the attached drawings as follows:

as shown in fig. 1, the utility model discloses an ultrafine powder grader, contain casing 40, hierarchical rotor, wind-guiding blade group 5, drive arrangement 1, transmission shaft 2, drive arrangement 1 sets up on the top of casing 40. The upper end of the transmission shaft 2 is located outside the top of the housing 40 and is connected to the driving device 1. The upper end of transmission shaft 2 constitutes to rotate with the top of casing 40 and is connected, and the lower extreme of transmission shaft 40 is located the inside of casing 40, and the lower extreme of transmission shaft 2 constitutes to rotate with the support and is connected, and the support setting is in the inside of casing 40. The wind guide blade group 5 forms a circular ring structure, the upper end of the wind guide blade group 5 is arranged on the upper circular ring fixing plate 4, and the lower end of the wind guide blade group 5 is arranged on the lower circular ring fixing plate 7. The upper circular fixing plate 4 and the lower circular fixing plate 7 are both arranged in the shell 40. The classifying rotor comprises a fixing frame 23, a plurality of powder selecting blades 6, an upper circular plate 25 and a lower circular plate 9, wherein the upper circular plate 25 and the lower circular plate 9 are respectively arranged at the upper end and the lower end of the fixing frame 23, the powder selecting blades 6 are uniformly distributed between the upper circular plate 25 and the lower circular plate 9, a shaft sleeve is arranged in the center of the fixing frame 23, and the shaft sleeve is arranged in the middle of the transmission shaft 2. The grading rotor is positioned in the wind guide blade group 5 with a circular ring structure. The superfine powder classifier also comprises a feeding and distributing device 8, an air guide cone 10, a flushing and dispersing device 21, a coarse powder collecting device and an air inlet and feeding pipe 18. The feeding and distributing device 8 is arranged on a lower annular plate 9 of the grading rotor. The air guide cone 10 is positioned below the lower end of the transmission shaft 2, and the air guide cone 10 is arranged in the shell 40 through a support rod. The washing and dispersing device 21 comprises an air inlet pipe, the upper part of the washing and dispersing device 21 is arranged on the lower end of the shell 40, and the lower part of the washing and dispersing device 21 is connected with the upper part of the coarse powder collecting device. The upper end of the air inlet feed pipe 18 penetrates through the coarse powder collecting device and the flushing and dispersing device 21 and is positioned inside the shell 40, and the upper end of the air inlet feed pipe 18 is positioned below the air guide cone 10. The lower end of the air inlet feeding pipe 18 is positioned at the outer side of the coarse powder collecting device, a feeding hole 19 is arranged at the lower end of the air inlet feeding pipe 18, and a plurality of air outlets 3 are arranged at the upper part of the shell 40.

The feeding and distributing device 8, as shown in fig. 1 and 2, includes an aggregate cylinder and a plurality of material guiding units, wherein the aggregate cylinder includes an inner cylinder 26, an outer cylinder 28, a circular bottom plate 27 and a plurality of material separating plates 36. The lower end of the inner cylinder 26 and the lower end of the outer cylinder 28 are disposed on the inner hole and the outer circumference of the annular bottom plate 27, respectively. The upper end of the inner cylinder 26 is disposed on the lower annular plate 9 of the classifying rotor. The material separating plates 36 are respectively and uniformly distributed on the circular bottom plate 27, one end of each material separating plate 36 is arranged on the outer circumferential surface of the inner cylinder 26, and the other end of each material separating plate 36 is arranged on the inner circumferential surface of the outer cylinder 28. The outer cylinder 28 is provided with an opening 35 on the circumferential surface thereof where the material-separating plate 36 intersects the outer cylinder 28. The material guiding unit comprises a material guiding plate 33, a rear material blocking plate 34, a front material blocking plate 29 and a wind shielding plate 31. The rear striker plate 34 is provided on the rear end edge of the guide plate 33. The front material stop plate 29 and the wind deflector 31 are hinged by a hinge 30. The front retainer plate 29 is provided on the rear of the front end edge of the retainer plate 33, as shown in fig. 2. The rear end of the guide plate 33, the rear end of the rear baffle plate 34 and the rear end of the front baffle plate 29 form a feeding opening, and the feeding opening is arranged on an opening 35 arranged on the circumferential surface of the outer cylinder 28. The front end of the guide plate 33, the front end of the rear striker plate 34 and the front end of the front striker plate 29 form a discharge opening 32, and the wind shield 31 can open and close the discharge opening 32. When the material in the material guiding unit reaches a certain amount, the material pushes the wind shield 31 open under the action of the centrifugal force of the material, and is spread out from the discharging opening 32. The spilled material is further dispersed after colliding with the inner wall surface of the housing 40.

For better collection material, be equipped with on the ring shape fixed plate 7 down and keep off the material ring, keep off the material ring and be the cylinder tubular construction, keep off the upper end setting of material ring and on ring shape fixed plate 7 down, keep off the lower extreme of material ring and be located the top of outer barrel 28 upper end, keep off the material of material ring and be the rubber slab.

In order to simplify the structure and improve the material scattering effect, the material guiding plate 33 is a triangular structure.

In order to improve the material scattering effect, the number of the plurality of material guide units is 6 to 12.

In order to further improve the sorting effect, a convex ring 38 is arranged on the upper circular ring plate 25 of the grading rotor, a concave ring 39 is arranged on the upper circular ring fixing plate 4, the convex ring 38 is matched with the concave ring 39, and the convex ring 38 is positioned in the concave ring 39.

For the sake of simplifying the structure, the cross section of the male ring 38 is rectangular, and the cross section of the female ring 39 is channel-shaped, as shown in fig. 4.

In order to simplify the structure and improve the washing effect on the materials, the washing and dispersing device, as shown in fig. 1 and 3, comprises a snail shell 24, a plurality of washing and dispersing blades 13, a plurality of cleaning cones 22 and a landing-assistant cone 22. The snail shell 24 includes a peripheral surface, a top and a bottom surface. The peripheral surface of the snail shell 24 is respectively provided with a first air inlet pipe 12 and a second air inlet pipe 37, the first air inlet pipe 12 and the second air inlet pipe 37 are symmetrical relative to the central line of the snail shell 24, the top surface is provided with an upper through hole, the bottom surface is provided with a lower through hole, the upper through hole on the top surface is provided with an upper feeding pipe 11, and the center of the upper through hole is superposed with the central line of the snail shell. The dispersing blades 13 are uniformly distributed in the snail shell 24, the dispersing blades 13 form a ring shape, an angle is formed between every two adjacent dispersing blades 13, the ring shape formed by the dispersing blades 13 is positioned below a through hole on the top surface of the snail shell 24, and the lower end of the ring shape formed by the dispersing blades 22 is arranged on the annular plate 14. The landing assistant cones 20 are of a broken-end cone structure, the annular plate is arranged on the small opening of the landing assistant cone, the large opening of the landing assistant cone is arranged on the lower through hole formed in the bottom surface of the snail shell, the plurality of cleaning cones 22 are of a hollow round cone structure, the upper end of each cleaning cone 22 is a small opening, the lower end of each cleaning cone 22 is a large opening, the plurality of cleaning cones 22 are arranged at the same interval from top to bottom, the plurality of cleaning cones 22 form an integral structure through connecting strips and are arranged on the snail shell 24, the plurality of cleaning cones 22 are located in the center of the circular ring formed by the plurality of dispersing blades 13, the cleaning cone located at the first upper end of each cleaning cone 22 is located in the upper feeding pipe 11, and the upper feeding pipe 11 is arranged at the lower end of the shell; the upper part of the air inlet feed pipe 18 is positioned in the center of a plurality of cleaning cones 22 and a landing assistant cone 20.

In order to further improve the washing effect on the materials, an angle formed between every two adjacent dispersing blades 13 is 10-20 degrees, as shown in fig. 3.

For simplifying the structure, the coarse powder collecting device, as shown in fig. 1, comprises a material guiding cylinder 15 and a cone 16, wherein a large opening of the cone 16 is arranged on the lower end of the material guiding cylinder 15, a coarse powder discharging opening 17 is arranged on the lower end of the cone 16, and the upper end of the material guiding cylinder 15 is arranged on a large opening of a landing assistant cone 20 of the flushing and dispersing device. The middle part of the air inlet pipe 18 is positioned in the guide cylinder 15 and the cone 16, and the lower end part of the air inlet pipe 18 penetrates through the cone 16 and is positioned on the outer side of the cone 16.

When the ultrafine powder grader is used, a plurality of air outlets 3 arranged on the upper part of the shell 40 are respectively connected with a dust collector, an air inlet pipe I12 and an air inlet pipe II 37 of the washing and dispersing device 21 are respectively connected with an air blower, an air inlet pipe 18 is connected with a fan, and a grading rotor and a feeding and distributing device 8 rotate under the driving of the transmission shaft 2. The crushed materials enter from a feed inlet 19 of an air inlet feed pipe 18, the air flow and the materials are mixed to move along the air inlet feed pipe 18, the materials pass through a channel formed between an air guide cone 10, a feeding and distributing device 8 and a shell 40 and an air guide blade group 5 to reach a powder selecting blade 6 of a classifying rotor, the mixed gas of the materials after rectification and jet flow dispersion between the air guide blade group 5 and the powder selecting blade 6 forms rotary air flow, coarse powder and fine powder are separated under the action of strong classifying vortex force, fine powder reaching the particle size requirement enters a dust collector through the classifying rotor along with the air flow through an air outlet 3, and the fine powder is collected. The coarse powder and a small amount of agglomerated fine powder fall into a material collecting barrel of a feeding and distributing device 8, the feeding and distributing device 8 is driven by a grading rotor to uniformly distribute the materials in the material collecting barrel to the inner wall surface of a shell 40 through a discharge opening 32 of a material guide unit, the materials collide with the inner wall surface of the shell 40 to obtain further dispersion, particularly, the agglomerated fine powder is separated, the separated fine powder enters the grading rotor along with ascending airflow to be sorted, the residual materials after dispersion spirally downwards pass through an upper feed pipe 11 along the inner wall surface of the shell 40 to be washed and distributed in a dispersing device, the materials entering a washing and distributing device 21 are firstly collided with a plurality of washing blades 13 under the driving of the airflow, further dispersion and separation are obtained after collision, then the materials are washed, separated, agglomerated fine powder is scattered again through a plurality of times of washing cones 22 which are arranged at the same interval from top to bottom by spirally and upwards through an ascending airflow, coarse powder and fine powder are separated again, pure coarse powder is discharged through a coarse powder discharge port 9 of a coarse powder collecting device, fine powder enters a channel formed between a feeding and distributing device 8 and a shell 40 along with an ascending airflow and then enters a mixed gas formed by rectification and jet flow dispersion between an air guide blade group 5 and a powder selecting blade 6 of a grading rotor to form a rotating airflow, coarse powder and fine powder are separated under the action of a strong grading vortex force, and fine powder meeting the requirement of granularity enters a dust collector through the grading rotor along with the airflow through an air outlet 3, so that the fine powder is collected. The coarse powder and a small amount of agglomerated fine powder fall into a material collecting barrel of the feeding and distributing device 8, the feeding and distributing device 8 is driven by the grading rotor to uniformly distribute the materials in the material collecting barrel to the inner wall surface of the shell 40 through the material guide unit, the materials are further dispersed after colliding with the inner wall surface of the shell 40, particularly the agglomerated fine powder is separated, and the separated fine powder enters the grading rotor along with the ascending air flow to be sorted.

As can be seen from the above, the materials after being sorted by the classifying rotor are firstly dispersed by the feeding and distributing device 8 and then further dispersed after colliding with the inner wall of the shell 40, and then are intensively washed by the washing and dispersing device 21, the agglomerated fine powder is broken up again, and the coarse powder and the fine powder are separated again. The ultrafine powder selecting machine is used for sorting, separating, dispersing and flushing materials, and then sorting, re-separating, dispersing and re-flushing the materials, and through the cyclic reciprocating motion, the sorting precision is high, the sorting efficiency is high, and the yield is high. Practice shows that compared with the prior art, the graded product d50 is below 6 um; the sorting efficiency is more than 80%; the single machine material handling capacity is more than 200 tons, and the finished product amount is more than 100 tons, the energy consumption of the unit product is reduced by 50 percent, and the method can be really used for industrial production.

The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An ultrafine powder classifier comprises a shell, a classifying rotor, an air guide blade group, a driving device and a transmission shaft, wherein the driving device is arranged on the top of the shell, the upper end of the transmission shaft is positioned on the outer side of the top of the shell and is connected with the driving device, the upper end of the transmission shaft is rotatably connected with the top of the shell, the lower end of the transmission shaft is positioned in the shell, the lower end of the transmission shaft is rotatably connected with a support, and the support is arranged in the shell; the wind guide blade group forms a circular structure, the upper end of the wind guide blade group is arranged on the upper circular fixing plate, the lower end of the wind guide blade group is arranged on the lower circular fixing plate, and the upper circular fixing plate and the lower circular fixing plate are both arranged in the shell; the grading rotor comprises a fixed frame, a plurality of powder selecting blades, an upper circular plate and a lower circular plate, wherein the upper circular plate and the lower circular plate are respectively arranged at the upper end and the lower end of the fixed frame; the grading rotor is positioned in the wind guide blade group with the circular structure; the device is characterized by further comprising a feeding and distributing device, an air guide cone, a flushing and dispersing device, a coarse powder collecting device and an air inlet feeding pipe, wherein the feeding and distributing device is arranged on a lower annular plate of the grading rotor, the air guide cone is located below the lower end of the transmission shaft, the air guide cone is arranged in the shell through a supporting rod, the flushing and dispersing device comprises an air inlet pipe, the upper portion of the flushing and dispersing device is arranged at the lower end of the shell, the lower portion of the flushing and dispersing device is connected with the upper portion of the coarse powder collecting device, the upper end of the air inlet feeding pipe penetrates through the coarse powder collecting device and is located inside the shell, the upper end of the air inlet feeding pipe is located below the air guide cone, the lower end of the air inlet feeding pipe is located on the outer side of.

2. An ultrafine powder grader according to claim 1, wherein the feeding and distributing device comprises an aggregate cylinder and a plurality of material guiding units, the aggregate cylinder comprises an inner cylinder, an outer cylinder, a circular bottom plate and a plurality of material separating plates, the lower end of the inner cylinder and the lower end of the outer cylinder are respectively arranged on the inner hole and the outer periphery of the circular bottom plate, the upper end of the inner cylinder is arranged on the lower circular plate of the grading rotor, the plurality of material separating plates are respectively and uniformly distributed on the circular bottom plate, one end of each material separating plate is arranged on the outer periphery of the inner cylinder, the other end of each material separating plate is arranged on the inner periphery of the outer cylinder, and an opening is arranged on the periphery of the outer cylinder at the intersection of the material separating plates and the outer cylinder; the guide unit includes the stock guide, the back striker plate, preceding striker plate and deep bead, the back striker plate sets up on the rear end edge of stock guide, preceding striker plate and deep bead pass through the hinge and constitute articulatedly, preceding striker plate sets up on the rear portion of the front end edge of stock guide, the rear end of stock guide constitutes feed opening with the rear end of back striker plate and the rear end of preceding baffle, feed opening sets up on the opening that is equipped with on the outer barrel is global, the front end of stock guide and the front end of the front striker plate of back striker plate constitute ejection of compact opening, the deep bead can open and close ejection of compact opening.

3. An ultrafine powder grader according to claim 2 wherein the lower annular fixing plate is provided with a baffle ring, the baffle ring is of a cylindrical tube structure, the upper end of the baffle ring is arranged on the lower annular fixing plate, the lower end of the baffle ring is positioned above the upper end of the outer cylinder, and the baffle ring is made of a rubber plate.

4. An ultra fine powder classifier as claimed in claim 2, wherein said guide plate is of triangular configuration.

5. An ultra-fine powder classifier as claimed in claim 2, wherein the number of said plurality of guide units is 6 to 12.

6. An ultra-fine powder classifier as claimed in claim 1, wherein said classifying rotor is provided with a convex ring on an upper annular plate and a concave ring on an upper annular fixing plate, said convex ring being fitted with said concave ring, said convex ring being located in said concave ring.

7. A superfine powder classifier as claimed in claim 6, wherein the cross section of the convex ring is rectangular and the cross section of the concave ring is channel-steel.

8. An ultrafine powder grader according to claim 1, wherein the flushing and dispersing device comprises a snail shell, a plurality of flushing and dispersing blades, a plurality of cleaning cones and a landing cone, the snail shell comprises a peripheral surface, a top surface and a bottom surface, a first air inlet pipe and a second air inlet pipe are respectively arranged on the peripheral surface of the snail shell, the first air inlet pipe and the second air inlet pipe are symmetrical relative to the central line of the snail shell, an upper through hole is arranged on the top surface, a lower through hole is arranged on the bottom surface, an upper feed pipe is arranged on the through hole on the top surface, the center of the upper through hole is coincident with the central line of the snail shell, a plurality of flushing and dispersing blades are uniformly distributed in the snail shell, a plurality of flushing and dispersing blades form a circular ring shape, an angle is formed between two adjacent flushing and dispersing blades, the circular ring shape formed by a plurality of flushing and dispersing blades is positioned below the through hole on the top surface of the, the landing assisting cone is of a broken-end cone structure, the annular plate is arranged on the small opening of the landing assisting cone, the large opening of the landing assisting cone is arranged on the lower through hole formed in the bottom surface of the snail shell, the cleaning cones are of hollow round cone structures and have the same structure, the upper end of each cleaning cone is a small opening, the lower end of each cleaning cone is a large opening, the cleaning cones are arranged at the same interval from top to bottom, the cleaning cones form an integral structure through connecting strips and are arranged on the snail shell, the cleaning cones are located in the center of a circular ring formed by the scattered blades, the cleaning cone located at the first upper end of each cleaning cone is located in the upper feeding pipe, and the upper feeding pipe is arranged at the lower end of the shell; the upper part of the air inlet feeding pipe is positioned in the centers of the cleaning cones and the landing assistant cones.

9. An ultra-fine powder classifier as claimed in claim 8, wherein said adjacent two dispersing blades form an angle of 10 ° to 20 °.

10. An ultrafine powder grader according to claim 8, wherein the coarse powder collecting device comprises a guide cylinder and a cone, the large opening of the cone is arranged at the lower end of the guide cylinder, the lower end of the cone is provided with a coarse powder discharging opening, and the upper end of the guide cylinder is arranged on the large opening of the landing assistant cone of the flushing and dispersing device; the lower part of the air inlet feeding pipe is positioned in the material guide cylinder and the cone, and the lower end of the air inlet feeding pipe penetrates through the cone and is positioned on the outer side of the cone.