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CN-121988527-A - Air flow classifying device

CN121988527ACN 121988527 ACN121988527 ACN 121988527ACN-121988527-A

Abstract

An air flow classification device belongs to the technical field of air flow classification and comprises a shell, wherein an upper classification wheel, a collecting bin, a scattering disc and a feeding pipe are sequentially arranged in the shell from top to bottom. The bottom surface of the scattering disc is coaxially and fixedly connected with a lower grading wheel, a plurality of hammerheads positioned inside the lower grading wheel are arranged on the bottom surface of the scattering disc along the circumference, the top of the collecting bin is communicated with the bottom of the upper grading wheel, a discharging pipe is arranged on the side surface of the collecting bin and penetrates through the outer portion of the shell, a vertically downward driving shaft is arranged on the top of the shell in a penetrating mode, the driving shaft is driven by a motor, the upper grading wheel and the scattering disc are coaxially connected to the driving shaft, the driving shaft penetrates through the collecting bin, a sealing sleeve is arranged between the outer wall of the driving shaft and the collecting bin, the upper end of the feeding pipe is positioned below the scattering disc and inside the lower grading wheel, the lower end of the feeding pipe penetrates through the outer portion of the shell, and a discharging pipe is arranged at the bottom of the shell. The superfine granule can be effectively sieved out to this scheme, has higher hierarchical efficiency and hierarchical effect.

Inventors

  • ZHANG QIAOMIAN
  • WANG BIAO
  • YANG QIAN
  • ZHANG XIAORONG

Assignees

  • 绵阳流能粉体设备有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (9)

  1. 1. An air flow classifying device is characterized by comprising a shell (1), wherein an upper classifying wheel (2), a collecting bin (3), a scattering disc (4) and a feeding pipe (5) are sequentially arranged in the shell from top to bottom; The bottom surface of the scattering disc (4) is coaxially and fixedly connected with a lower grading wheel (6), a plurality of hammerheads (41) positioned inside the lower grading wheel (6) are arranged on the bottom surface of the scattering disc (4) along the circumference, annular intervals are arranged between the upper grading wheel (2) and the inner wall of the shell (1) and between the lower grading wheel (6) and the inner wall of the shell (1), and the gaps among the blades of the lower grading wheel (6) are larger than those among the blades of the upper grading wheel (2); The top of the aggregate bin (3) is communicated with the bottom of the upper classifying wheel (2), and a discharging pipe (31) is communicated with the side surface of the aggregate bin (3) and penetrates through the outer part of the shell (1); A vertical downward driving shaft (11) is arranged on the top of the shell (1) in a penetrating way, the driving shaft (11) is driven by a motor, the upper classifying wheel (2) and the scattering disc (4) are coaxially connected to the driving shaft (11), the driving shaft (11) penetrates through the collecting bin (3), and a sealing sleeve (12) is arranged between the outer wall of the driving shaft (11) and the collecting bin (3); the upper end of inlet pipe (5) is located the below of breaking up dish (4), and is located the inside of lower classifying wheel (6), and the outside to shell (1) is worn to establish by the lower extreme of inlet pipe (5), and the bottom of shell (1) is equipped with row material pipe (13).
  2. 2. An air flow classifying device according to claim 1, characterized in that the lower part of the scattering disk (4) is coaxially provided with a flow guiding pipe (7) which is positioned outside the hammer head (41) and inside the lower classifying wheel (6), an annular interval is arranged between the outer wall of the flow guiding pipe (7) and the lower classifying wheel (6), an interval is arranged between the top surface of the flow guiding pipe (7) and the bottom surface of the scattering disk (4), the upper end of the feed pipe (5) is aligned with the lower end of the flow guiding pipe (7), and the flow guiding pipe (7) is connected to the inner wall of the shell (1).
  3. 3. An air classifier as claimed in claim 2, wherein the inner wall of the duct (7) is provided with ribs parallel to its axis, and the ribs are provided in a plurality along the circumferential array of the duct (7).
  4. 4. An air classifier as claimed in claim 2, wherein the lower end of the draft tube (7) is annularly spaced from the lower end of the lower classifying wheel (6).
  5. 5. An air classifier as claimed in claim 1, wherein the classifying blades of the lower classifier wheel (6) are inclined toward the outer side of the lower classifier wheel (6) toward the side in the rotation direction of the drive shaft (11).
  6. 6. An air classifier as claimed in claim 1, wherein the outer diameter of the scattering disk (4) is larger than the outer diameter of the upper classifying wheel (2), a plurality of spoilers (42) are provided on the top surface of the scattering disk (4) in a circumferential array, the radius of the track of the array of spoilers (42) is larger than the radius of the upper classifying wheel (2), and the side of the spoilers (42) toward the rotation direction of the drive shaft (11) is inclined toward above the axis of the upper classifying wheel (2).
  7. 7. An air classifier as claimed in claim 1, wherein the top of the housing (1) is provided with a drive motor (8) and the lower end of the main shaft is coaxially connected to the drive shaft (11).
  8. 8. An air flow classifying device according to claim 1, characterized in that the housing (1) is provided with an upper, middle and lower three-section assembly structure, the upper classifying wheel (2) is arranged at the upper section of the housing (1), the collecting bin (3), the scattering disc (4) and the lower classifying wheel (6) are arranged at the middle section of the housing (1), and the feed pipe (5) is arranged at the lower section of the housing (1).
  9. 9. An air classifier as claimed in claim 1, wherein the bottom of the break-up disc (4) is coaxially provided with an inverted cone (43).

Description

Air flow classifying device Technical Field The invention belongs to the technical field of air flow classification, and particularly relates to an air flow classification device. Background The particle size index is one of parameters for controlling the core of the superfine powder, and the accurate separation of the powder with the target particle size is realized through a professional classification technology. The superfine powder has the characteristics of small particle size, large specific surface area and high surface energy, has obvious inter-particle adhesion effect and high dispersion difficulty, and further directly influences the sorting effect of qualified particle size powder. For example, carbon powder as a negative electrode of a battery, which has a specific requirement for minimum particle size, requires a particle size of >2 μm, but the raw material is processed to produce ultrafine particles of <2 μm, and the portion of unacceptable ultrafine particles is removed by a classification process. However, because carbon powder has the inherent properties of high surface energy and strong viscosity, agglomeration of particles is very easy to occur, and secondary particles formed by agglomeration can damage the granularity screening precision in the classification process, so that ultrafine powder with the particle size of <2 μm cannot be effectively separated. In the prior art, in order to make the incoming material flow uniform and stable and improve the classification efficiency and the powder classification effect, a gas classifier is disclosed in the chinese patent document with the application number CN201721108857.0, and the side of the classifying cylinder is connected with a pneumatic feeding pipe, a section of the pneumatic feeding pipe, which is located outside the classifying cylinder, is provided with a feeding funnel, and a material dispersing device, which is arranged upwards, is installed on the material inlet end. However, the dispersing device of the scheme utilizes the dispersing blades to disperse materials, although the classifying precision can be improved, agglomeration among particles is reduced, the dispersing blades can generate upward air flow when dispersing the materials, and the air flow directly faces the bottom of the classifying impeller, when the upward air flow is blocked by the bottom of the classifying impeller, part of the air flow downwards flows, a turbulence area is formed between the classifying impeller and the dispersing blades, so that part of the materials can turn over and stay in the turbulence area for a long time, the rising speed of the materials is influenced, and then the classifying efficiency is adversely affected. Disclosure of Invention In order to solve the defects in the prior art, the invention provides an air flow classifying device which can effectively screen ultrafine particles and has higher classifying efficiency and classifying effect. In order to achieve the object of the invention, the following scheme is adopted: An air flow classifying device comprises a shell, wherein an upper classifying wheel, a collecting bin, a scattering disc and a feeding pipe are sequentially arranged in the shell from top to bottom; The bottom surface of the scattering disc is coaxially and fixedly connected with a lower grading wheel, a plurality of hammerheads positioned inside the lower grading wheel are arranged on the bottom surface of the scattering disc along the circumference, annular spaces are arranged between the upper grading wheel and the inner wall of the shell as well as between the lower grading wheel and the inner wall of the shell, and the gaps between the lower grading wheel blades are larger than those between the upper grading wheel blades; The top of the aggregate bin is communicated with the bottom of the upper classifying wheel, and the side surface of the aggregate bin is communicated with a discharging pipe which penetrates through the outer part of the shell; A vertical downward driving shaft is penetrated at the top of the shell, the driving shaft is driven by a motor, the upper grading wheel and the scattering disc are coaxially connected to the driving shaft, the driving shaft penetrates through the collecting bin, and a sealing sleeve is arranged between the outer wall of the driving shaft and the collecting bin; The upper end of inlet pipe is located the below of breaking up the dish, and is located the inside of lower grading wheel, and the outside to the shell is worn to establish by the lower extreme of inlet pipe, and the bottom of shell is equipped with row material pipe. The method has the beneficial effects that the method can not only effectively improve the grading efficiency, but also greatly improve the sieving rate of ultrafine particles through repeated scattering and grading treatment. Drawings The drawings described herein are for illustration of selected embodiments only and not all possible impleme