High-efficiency low-resistance coarse-fine gradient grading powder separator and grading method and design method thereof

Abstract

This invention discloses a high-efficiency, low-resistance coarse-fine gradient classifier and its classification method and design method. From bottom to top, it comprises a sequentially connected air distribution and material distribution zone, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return zone, and a medium-coarse and fine powder classification zone. The air distribution and material distribution zone includes an air inlet shell, an air inlet, a coarse particle outlet, a guide cone, and an annular air ring. The pre-dispersion and coarse particle classification zone includes a coarse particle sorting shell, a coarse particle sorting drum, a material distribution device, and a coarse particle sorting drive. The feeding and medium-coarse powder return zone and the medium-coarse and fine powder classification zone include a main feed pipe, a medium-coarse powder return pipe, and a fine classification device. This invention features a combined device for dispersion, material distribution, and separation of coarse, medium, and fine particles. It can achieve clearer coarse-fine particle gradient classification without using V-separation, resulting in lower classification resistance and longer service life of wear parts. It solves a series of problems caused by common issues of V-separation and meets the material classification requirements of combined / semi-finished grinding systems.

Description

Technical Field

[0001] This invention relates to the field of powder classification technology, and in particular to a high-efficiency, low-resistivity coarse-fine gradient powder classifier and its classification method and design method. Background Technology

[0002] In grinding processes, material bed extrusion equipment such as roller presses and vertical roller mills are more suitable for grinding particles with larger diameters (d > 0.2 mm). Excessively fine materials are difficult to form a stable material bed, causing equipment vibration, increasing wasted effort, and resulting in high energy consumption. Furthermore, water spraying to stabilize the material bed can also affect the quality of the finished product. Conversely, fine grinding equipment such as tube mills and stirred mills are more suitable for grinding particles with smaller diameters (d < 0.2 mm). Excessively coarse materials can easily lead to reduced grinding efficiency, with large particles becoming coarse and failing to meet the fineness requirements of the finished product. Therefore, in combined / semi-finished grinding systems consisting of extrusion equipment and fine grinding equipment, corresponding requirements for coarse-fine gradient classification are proposed.

[0003] In traditional combined / semi-finished grinding systems, the material pre-ground by the roller press is carried by a V-type classifier to a fine dynamic classifier for separation. Because the V-type classifier relies entirely on inertial force to classify the semi-finished product, the separation process has poor controllability. Furthermore, the V-type classifier suffers from the common problem of localized high wind velocities caused by air short-circuiting at the top, resulting in a large amount of coarse particles directly entering the fine dynamic classifier. This leads to an increase in the classifier's concentration and, under the same finished product fineness control conditions, an increase in the classifier's rotational speed due to the influx of coarse particles. This results in reduced classifier efficiency, increased circulating load, and decreased separation clarity. More finished product returns to the roller press, causing material layer instability, mill vibration, reduced grinding efficiency, reduced operating hours, and increased power consumption. Simultaneously, the material returning to the dynamic classifier in the tube mill also contains coarse particles (d>0.2mm) that should have entered the roller press, increasing the grinding load and circulating load of the tube mill, reducing both classifier and grinding efficiency, further reducing operating hours and increasing power consumption. Summary of the Invention

[0004] To address the aforementioned series of problems caused by the common issue of unclear coarse and fine particle separation in existing combined / semi-finish grinding systems, this invention provides a high-efficiency, low-resistivity coarse-fine gradient classifier and its classification method and design method. In addition to the coarse and fine powder separation function of traditional dynamic classifiers, this high-efficiency, low-resistivity coarse-fine gradient classifier is a combined device with dispersing, feeding, and separation of coarse, medium, and fine particles. From bottom to top, it consists of an air and feeding zone, a pre-dispersing and coarse particle classification zone, a feeding and medium-coarse powder return zone, and a medium-coarse powder and fine powder classification zone. Unlike traditional V-type classifiers and fine dynamic classifiers used in combined / semi-finish grinding systems, this coarse-fine gradient classifier can achieve clearer classification of coarse and fine particles without the use of a V-type classifier. It has lower classification resistance and longer service life of wear parts. It solves a series of problems caused by the common problems of V-type classifiers, allowing coarse particles (d>0.2mm) to return to the material bed extrusion equipment, fine powder to be selected as finished product (d<0.045mm), and medium-coarse powder (0.045mm<d<0.2mm) to return to the fine grinding equipment, thus meeting the requirements of combined / semi-finish grinding systems for materials of different fineness.

[0005] The present invention is implemented as follows: a high-efficiency, low-resistance coarse and fine gradient classifier, wherein the coarse and fine gradient classifier is formed from bottom to top as a sequentially connected air distribution and material distribution zone, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return zone, and a medium-coarse powder and fine powder classification zone.

[0006] The air distribution area includes an air inlet housing, an air inlet, a coarse particle outlet, a guide cone, and an annular air ring. The air inlet is located on the side of the air inlet housing, the coarse particle outlet is located at the bottom of the air inlet housing, the guide cone is located inside the air inlet housing and is arranged coaxially, and the annular air ring is installed between the outer edge of the guide cone and the inner edge of the top of the air inlet housing.

[0007] The pre-dispersing and coarse particle classification zone includes a coarse particle sorting shell, a coarse particle sorting rotating cage, a feeding device, and a coarse particle sorting drive. The coarse particle sorting rotating cage is located inside the coarse particle sorting shell. The coarse particle sorting rotating cage includes coarse particle classification blades located around the perimeter and cage cones coaxially arranged inside the coarse particle classification blades. The top of the coarse particle sorting rotating cage is provided with an upper ring plate, the middle with a middle ring plate, and the bottom with a lower ring plate. The coarse particle classification blades are located between the upper, middle, and lower ring plates, close to the outer edges of the upper, middle, and lower ring plates, and are evenly radially distributed. A support cover plate is installed above the particle sorting shell and the coarse particle grading blades. The bottom surface of the support cover plate is fixedly connected to the coarse particle sorting shell, and the bottom surface of the support cover plate is connected to the upper ring plate of the coarse particle sorting drum in a dynamic sealing manner, forming the upper seal of the coarse particle sorting drum. The support cover plate, the coarse particle sorting shell, and the coarse particle grading blades together form the coarse particle grading zone. The inner edge of the top surface of the support cover plate is connected to the outlet air duct of the coarse particle sorting drum. The lower ring plate of the coarse particle sorting drum is connected to the inner ring of the annular air ring in a dynamic sealing manner, forming the lower seal of the coarse particle sorting drum.

[0008] The feeding device is located at the top of the coarse particle grading zone and above the upper ring plate of the coarse particle sorting drum. The feeding device consists of a feeding disc and dispersing blades. The feeding disc is fastened to the upper ring plate by bolts. The dispersing blades are evenly radially distributed on the feeding disc. Multiple feeding ports are evenly opened on the support cover plate corresponding to the position directly above the feeding disc.

[0009] A lifting platform is provided between the coarse particle sorting shell and the air inlet shell, and the lower side of the lifting platform is adjacent to the annular air ring.

[0010] The coarse particle sorting drive is connected to the coarse particle sorting rotating drum via a shaft system 1, and is used to drive the coarse particle sorting rotating drum to rotate.

[0011] The feeding and coarse powder return area and the coarse and fine powder classification area include a main feeding pipe, a coarse powder return pipe and a fine classification device. The main feeding pipe is connected to the corresponding feeding port through various branch feeding pipes. One end of the coarse powder return pipe is connected to the coarse powder return cone of the fine classification device, and the other end extends out of the fine classification shell. The fine classification shell is connected to the outlet air duct of the coarse particle sorting drum, forming a dust-laden airflow rising channel.

[0012] Preferably, the upper seal of the coarse particle sorting drum is a "groove" type dynamic seal structure, and the "groove" type dynamic seal structure is close to the inner edge of the cloth feeding device; the "groove" type dynamic seal structure is composed of a dynamic sealing ring and a dynamic sealing groove, the dynamic sealing ring is fixed to the inner edge of the upper ring plate, the dynamic sealing groove is fixed to the bottom surface of the support cover plate, the dynamic sealing ring extends into the dynamic sealing groove and cooperates with the dynamic sealing groove, and the cooperation gaps in all directions are 10-20mm.

[0013] Preferably, a dynamic sealing outer ring is fixedly connected to the lower outer edge of the lower ring plate, and a dynamic sealing inner ring is provided on the inner ring of the annular air ring. The dynamic sealing outer ring and the dynamic sealing inner ring cooperate to form the lower seal of the coarse particle sorting rotating cage, and the dynamic sealing gap of the lower seal of the coarse particle sorting rotating cage is 10-20mm. Preferably, the upper ring plate is connected to the cage cone through a rotating cage tie rod. The arrangement direction of the rotating cage tie rod is consistent with the rotation direction of the coarse particle sorting rotating cage and is evenly distributed along the axis of the coarse particle sorting rotating cage. The inner edge of the lower ring plate is connected to the cage cone. The inner edge of the middle ring plate is connected to the cage cone through a tie rod or a stiffening plate.

[0014] Preferably, the shaft system includes a main shaft and a main shaft sleeve fitted on the main shaft, and a hub is provided at the top of the main shaft, the hub being connected to the cage cone.

[0015] Preferably, the air distribution and material distribution area and the pre-dispersing and coarse particle classification area, as well as the feeding and medium-coarse powder return area and the medium-coarse powder and fine powder classification area, can be used as two independent parts and arranged at different heights according to process requirements. In this case, the outlet air duct of the coarse particle sorting drum is replaced with a non-standard connecting air duct, and the air distribution and material distribution area and the pre-dispersing and coarse particle classification area are connected to the medium-coarse powder and fine powder classification area through the non-standard connecting air duct.

[0016] Preferably, the air inlet is connected to a grading device or a grinding device, and the dust-laden airflow to be sorted is introduced into the air inlet housing in a wind-sweeping manner.

[0017] Preferably, an annular "stepped" shaped dispersing device or an annular "Z" shaped dispersing device is provided below the annular air ring and in the inner cavity of the air inlet housing;

[0018] The dispersing plates of the annular "stepped" dispersing device are arranged in a stepped structure with a certain spacing. The overlap distance of the generatrix projection of two adjacent dispersing plates is 100-200mm. Each dispersing plate is supported on the inner wall of the air inlet shell by a support device, and the dispersing plates are connected by connecting ribs.

[0019] The dispersing plates of the annular "Z"-shaped dispersing device are partially supported on the inner wall of the air inlet housing by a support device, and partially supported on the outer wall of the guide cone by a support device. The dispersing plates on both sides are arranged in a stepped structure with a certain spacing. A dispersing and grading channel is formed between two adjacent dispersing plates on both sides, corresponding to each other. The distance between the projection point of the end of the upper dispersing plate on the lower dispersing plate and the end of the dispersing plate is 100-200mm. The angle θ8 between the dispersing plates of the annular "stepped" dispersing device and the annular "Z"-shaped dispersing device and the horizontal direction is 40-50°.

[0020] Preferably, the annular wind ring includes an inner wind ring, an outer wind ring, and several wind ring guide vanes inclined between the inner and outer wind rings; the gap velocity of the wind ring guide vanes is 18±2 m / s; the angle θ2 between the wind ring guide vanes and the horizontal direction is 35 to 45°; the ratio S1:S2 = 0.3 to 0.8 of the horizontal projection overlap length of two adjacent wind ring guide vanes to the horizontal projection length of a single wind ring guide vane.

[0021] Preferably, the bottom end of the guide cone is connected to a coarse material guide cone.

[0022] Preferably, a return control device is provided inside the medium-coarse powder return cone, the return control device including a medium-coarse powder guide cone, a medium-coarse powder distribution cone, and a medium-coarse powder circulation pipe; an annular area for collecting medium-coarse powder is formed between the medium-coarse powder guide cone and the medium-coarse powder return cone, and several medium-coarse powder distribution cones are evenly distributed along the circumference of the annular area. Each medium-coarse powder distribution cone is formed by two plates stacked together in a ridge shape, and together with the medium-coarse powder guide cone located in the center, the medium-coarse powder distribution cones divide the annular area into several funnel-shaped material zones; each funnel-shaped material zone has a return pipe interface at its bottom. The return pipe interface is funnel-shaped, wider at the top and narrower at the bottom. The lower end of the return pipe interface is connected to the medium-coarse powder return pipe. The upper part of the medium-coarse powder guide cone is provided with a medium-coarse powder overflow hole, and the lower part is provided with a medium-coarse powder discharge hole. The upper end of the medium-coarse powder circulation pipe is connected to the medium-coarse powder discharge hole, and the lower end is connected to the feed pipe. It is used to guide part of the medium-coarse powder overflowing through the medium-coarse powder overflow hole into the feed pipe and then into the coarse particle sorting area for secondary sorting. The medium-coarse powder return pipe is provided with a medium-coarse powder return control valve to adjust the balance between the medium-coarse powder entering the subsequent medium-coarse powder fine grinding process and the secondary sorting of medium-coarse powder.

[0023] The classification method of the above-mentioned high-efficiency, low-resistance coarse-fine gradient classifier is as follows: The material to be classified is fed into the various feed pipes evenly distributed above the support cover plate through the main feed pipe. Then, it enters the distribution disc that rotates with the coarse particle classification drum and is dispersed and thrown out of the distribution disc by the distribution disc and the dispersing blades fixed thereon. Then, under the action of gravity, it passes downward through the coarse particle classification zone. The medium and coarse powder and fine powder that meet the fineness requirements enter the coarse particle classification drum and are carried by the airflow into the subsequent fine classification process. The coarse particles that do not meet the fineness requirements, as well as a small amount of medium and coarse powder and fine powder mixed between the coarse particles, continue to enter the annular air ring and are further dispersed and classified by the air ring guide blades of the annular air ring. This ensures that the small amount of medium and coarse powder and fine powder mixed between the material flow and the fine powder adhering to the surface of the coarse particles are fully dispersed and detached. The classification airflow enters through the air inlet and is evenly distributed and blown at high speed. The material is washed and dispersed, completing the first coarse particle classification. Most of the coarse particles return to the material bed extrusion equipment for further grinding under gravity. A small portion of coarse particles, most of the medium and coarse powder, and fine powder are carried upward by the sorting airflow through the annular air ring and enter the coarse particle sorting zone to complete the second coarse and fine particle classification. The dust-laden airflow after sorting enters the subsequent medium and coarse powder and fine powder classification zone along the dust-laden airflow rising channel. The fine classification device completes the fine classification of medium and coarse powder and fine powder through the dust-laden airflow passing through the stationary blades. The sorted fine powder is collected as finished product. The medium and coarse powder is processed through the return control device, medium and coarse powder return control valve, medium and coarse powder return pipe, medium and coarse powder overflow hole, and medium and coarse powder circulation pipe. Most of it enters the fine grinding equipment for further grinding, and a small portion returns to the coarse particle sorting zone for secondary sorting to maximize the powder selection efficiency of medium and coarse powder.

[0024] The design method for the above-mentioned high-efficiency, low-resistivity coarse-fine gradient classifier includes setting the following process structural parameters:

[0025] 1) System powder selection air volume Q (m³) 3 / h):

[0026] Based on the system design output P (t / h), system circulating load k, and powder concentration C... s (g / m 3 ), feed concentration F s (kg / m 3 ), calculate the air volume Q (m³) of the powder selection system. 3 / h):

[0027]

[0028] Wherein, the system cyclic load k = 3 ± 1, and the powder concentration C s =800±200g / m 3 Feed concentration F s =2.5±0.5kg / m 3 ;

[0029] 2) Diameter D1 (mm) of the coarse particle sorting drum:

[0030]

[0031] Wherein, D / H is the diameter-to-height ratio of the coarse particle sorting drum, D / H = 1.8 to 2.0, and V2 is the radial wind speed of the coarse particle sorting drum, V2 = 1.5 to 2.5 (m / s);

[0032] 3) Coarse particle sorting drum height H1 (mm):

[0033]

[0034] 4) Lower ring plate outer diameter D2 (mm):

[0035] D2 = D1 - (0 ~ 50) (4)

[0036] 5) Outer diameter D of the fabric disc 2o (mm), inner diameter D of fabric tray 2i (mm), height of the dispersed blades h s (mm):

[0037] D 2i =D3+(150~250) (5)

[0038] D 2O =D 2i +(500~700) (6)

[0039] h s =100±50 (7)

[0040] 6) Inner diameter of the wind ring, D6 (mm):

[0041] D6 = D2 - (40~60) (8)

[0042] 7) Outer diameter of the air ring or inner diameter of the air inlet casing, D7 (mm):

[0043]

[0044] Where V3 is the outlet wind speed of the annular wind ring, V3=10±2(m / s);

[0045] 8) Flow guide cone - Coarse material guide cone interface diameter D8 (mm):

[0046]

[0047] Wherein, V5 is the air inlet boost velocity, V5 = 3~5 (m / s);

[0048] 9) Diameter D5 (mm) of the upper end of the inner cavity of the coarse particle sorting shell:

[0049] D5=D1+(400±100)mm (11)

[0050] 10) Feed pipe diameter D4 (mm):

[0051]

[0052] Wherein, the system cyclic load k = 3 ± 1, and the material bulk density ρ s =1.5~1.8 (t / m3), material flow velocity V s =1±0.5(m / s), material filling rate ε=0.5~0.8, i is the number of feed tubes;

[0053] 11) Diameter D3 (mm) of the outlet duct of the coarse particle sorting rotary drum:

[0054]

[0055] Wherein, V1 is the outlet wind speed of the coarse particle sorting drum, V1 = 10~15 (m / s);

[0056] 12) Number of medium and coarse powder return pipes, n1 (units):

[0057] n1=3±1 (14)

[0058] 13) Diameter d2 (mm) of the medium and coarse powder return pipe:

[0059]

[0060] Wherein, the system cyclic load k = 3 ± 1, and the material bulk density ρ s =1.5~1.8 (t / m 3 Material flow velocity V s =1±0.5(m / s), material filling rate ε=0.5~0.8, number of medium and coarse powder return pipes n1=3 (pieces);

[0061] 14) Diameter d3 (mm) of the overflow hole for medium and coarse powder, and diameter d of the discharge hole and circulating pipe for medium and coarse powder. 10 (mm):

[0062] d3=d 10 =d2 (16)

[0063] 15) Number of wind ring guide vanes n3 (units):

[0064]

[0065] Where d1 is the gap between two adjacent wind ring guide vanes, d1 = 100 ~ 200 (mm), V4 is the gap wind speed of the wind ring guide vanes, V4 = 18 ± 2 (m / s), and n3 is rounded to the nearest integer.

[0066] 16) Height H2 of the annular air ring (mm):

[0067]

[0068] Wherein, θ2 is the angle between the wind ring guide blade and the horizontal direction, θ2=40±5(°); S1 / S2 is the ratio of the horizontal projection overlap length of two adjacent wind ring guide blades to the horizontal projection length of a single wind ring guide blade, S1 / S2=0.3~0.8; t is the thickness of the wind ring guide blade, t=10~20(mm);

[0069] 17) Height of the lifting platform H3 (mm):

[0070] H3=(0.2±0.05)H1 (19)

[0071] 18) The vertical clearance H4 (mm) between the lower edge of the return pipe interface and the bottom of the medium-coarse powder return cone:

[0072] H4=200±50 (20)

[0073] 19) The vertical clearance H5 (mm) between the lower edge of the overflow hole for medium and coarse powder and the upper edge of the return pipe interface:

[0074] H5=300±50 (21)

[0075] 20) The angle θ1 (°) between the inner ring of the wind ring and the horizontal direction:

[0076] θ1=60±10 (22)

[0077] 21) The angle θ3 (°) between the guide cone and the horizontal direction:

[0078] θ3=60±10 (23)

[0079] 22) The angle θ4 (°) between the lifting platform and the horizontal direction:

[0080] θ4=50±5 (24)

[0081] 23) The angle θ5 (°) between the coarse material guide cone and the horizontal direction:

[0082] θ5=60±5 (25)

[0083] 24) The angle θ6 (°) between the coarse particle sorting shell and the horizontal direction:

[0084] θ6=70±5 (26)

[0085] 25) The angle θ7 (°) between the medium and coarse powder guide cone and the horizontal direction:

[0086] θ7=65±10 (27)

[0087] 26) The line connecting the lower edge of the medium-coarse powder overflow hole and the upper edge of the medium-coarse powder return cone is at the same horizontal angle θ9 (°):

[0088] θ9=45±10 (28)

[0089] 27) The diameters of the lower end of the dispersing plate of the annular "stepped" dispersing device, from top to bottom, are D9 (mm), D... 10 (mm), D 11 (mm), D 12 (mm):

[0090]

[0091] D 12 =D8+(500~600) (30)

[0092]

[0093]

[0094] 28) The gaps between two adjacent dispersing plates of the annular "stepped" dispersing device, from top to bottom, are d4 (mm), d5 (mm), and d6 (mm), respectively:

[0095]

[0096] Among them, V6=14±2 is the blowing speed (m / s) of the annular "stepped" shaped dispersing device;

[0097] 29) The diameter of the lower end of the dispersing plate of the annular "Z"-shaped dispersing device, from top to bottom, is D 13 (mm), D 14 (mm), D 15 (mm), D 16 (mm):

[0098]

[0099]

[0100] 30) The gaps between two adjacent dispersing plates of the annular "Z"-shaped dispersing device, from top to bottom, are d7 (mm), d8 (mm), and d9 (mm), respectively:

[0101]

[0102]

[0103]

[0104] Among them, V7 is the blowing speed of the annular "Z"-shaped dispersing device, V7=14±2(m / s);

[0105] 31) The overlap distances of the generatrice projections of two adjacent dispersing plates in the annular "stepped" dispersing device, from top to bottom, are S3 (mm), S4 (mm), and S5 (mm):

[0106] S3=S4=S5=150±50 (39)

[0107] If S3, S4, and S5 do not meet the requirements of equation (39), then D9 and D can be adjusted appropriately. 10 D 11 Calculated value;

[0108] 32) The distances from the projection point of the end of the upper dispersing plate onto the lower dispersing plate of the annular "Z"-shaped dispersing device to the end of the dispersing plate are S7 (mm), S8 (mm), and S9 (mm) from top to bottom:

[0109] S7=S8=S9=150±50 (40)

[0110] If S7, S8, and S9 do not meet the requirements of equation (40), then D can be adjusted appropriately. 14 D 15 D 16 Calculated value;

[0111] 33) The angle θ8 (°) between the dispersing plates of the annular "stepped" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction:

[0112] θ8=45±5 (41).

[0113] The advantages and positive effects of this invention are:

[0114] This invention utilizes a coarse particle sorting drum with an independently driven forced vortex field that completely shields coarse particles from entering the subsequent fine powder classification process, thus achieving gradient classification of coarse, medium, and fine particles and meeting the grinding requirements of different equipment in combined / semi-finished grinding systems. A material distribution device is installed at the top of the coarse particle classification zone, where dispersing blades break up the material cake formed by the material bed extrusion equipment, shortening the large height difference required for static dispersal, reducing building height, and saving civil engineering costs. The material distribution disc evenly throws out the broken material cake, which then passes downwards through the coarse particle classification zone under gravity, fully utilizing the scouring effect of gas-solid countercurrent flow. This increases the effective classification time of the material to be sorted and achieves clearer separation of coarse and fine particles by utilizing the difference in inertia. The inclusion of a guide cone and an annular air ring, compared to traditional V-type classifiers, results in a more uniform airflow distribution, more precise coarse particle cutting, reduced coarse particles entering the classification zone, lower circulating load and material concentration, reduced equipment resistance, and lower power consumption of the circulating fan. This high-efficiency, low-resistance coarse-fine gradient classifier has a compact structure and solves the problem of uneven airflow and material flow in traditional V-type classifiers. It also achieves accurate classification of coarse particles, medium-coarse powder, and fine powder. The coarse particle separation clarity is higher, the classifier resistance is lower, and the service life of wear parts is longer. Its performance is completely superior to the traditional V-type classifier and fine dynamic classifier in series, and it can replace them. Attached Figure Description

[0115] To more clearly illustrate the technical solutions of the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some specific embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0116] Figure 1 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse-fine gradient classifier of the present invention;

[0117] Figure 2 yes Figure 1 AA view;

[0118] Figure 3 yes Figure 1 Partial detail of section A;

[0119] Figure 4 yes Figure 1 Partial detail of section B;

[0120] Figure 5 This is a schematic diagram of the structure of the fabric distribution area, pre-dispersion area and coarse particle classification area of ​​the present invention;

[0121] Figure 6 yes Figure 5 BB view;

[0122] Figure 7 yes Figure 5 CC view;

[0123] Figure 8 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse-fine gradient classifier with independent upper and lower partitions of the present invention;

[0124] Figure 9 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse-fine gradient classifier of the present invention, which introduces dust-laden airflow in a wind-sweeping manner;

[0125] Figure 10 This is a schematic diagram of the annular "stepped" shaped dispersing device of the present invention;

[0126] Figure 11 This is a schematic diagram of the annular "Z"-shaped dispersing device of the present invention;

[0127] Figure 12 This is a schematic diagram of the process structure parameters of the high-efficiency, low-resistivity coarse-fine gradient classifier of the present invention;

[0128] Figure 13 This is a schematic diagram of the process structure parameters of the annular "stepped" shaped dispersing device of the present invention;

[0129] Figure 14 This is a schematic diagram of the process structure parameters of the annular "Z"-shaped dispersing device of the present invention.

[0130] The components include: 1. Fine grading drive; 2. Fine grading shell; 3. Fine powder sorting drum; 4. Stationary blades; 5. Return material control device; 5-1. Medium and coarse powder overflow hole; 5-2. Medium and coarse powder circulation pipe; 5-3. Medium and coarse powder discharge hole; 6. Medium and coarse powder return pipe; 7. Coarse particle sorting shell; 8. Main feed pipe; 8-1. Sub-feed pipe; 9. Particle sorting drum outlet air duct; 10. Air distribution and pre-dispersion and coarse particle grading zone; 11. Upper bearing seat; 12. Drum. 13. Tie rod; 14. Upper seal of coarse particle sorting drum; 15. Hub; 16. Lower seal of coarse particle sorting drum; 17. Distribution disc; 18. Upper ring plate; 19. Dispersing blades; 20. Support cover plate; 21. Middle ring plate; 22. Coarse particle grading blades; 23. Lower ring plate; 24. Dynamic sealing ring; 25. Dynamic sealing groove; 26. Annular air ring; 27. Upper bearing seat support platform; 28. Air inlet housing; 29. ​​Coarse particle outlet; 30. Drive unit base; 21. Feed port; 31. Cage cone; 32. Bearing seat support; 33. Ear plate; 34. Lifting platform; 35. Main shaft sleeve; 36. Guide cone; 37. Lower bearing seat; 38. Coarse material guide cone; 39. Equipment foundation support; 40. Support flange; 41. Main shaft; 42. Coarse particle sorting drive; 43. Return chute; 44. Return pipe interface; 45. Medium and coarse powder separating cone; 46. Medium and coarse powder guide cone; 47. Air inlet; 48. Outer ring of air ring; 49. Air ring guide vane; 50. 51. Inner ring of the air ring; 52. Coarse particle sorting drum; 53. Material feeding device; 54. Dynamic seal outer ring; 55. Dynamic seal inner ring; 56. Medium and coarse powder return control valve; 57. Grading equipment or grinding equipment; 58. Medium and coarse powder return cone; 59. Medium, coarse and fine powder grading zone; 60. Support; 61. Non-standard connecting air duct; 62. Support device; 63. Connecting stiffener; 64. Annular "stepped" shaped dispersing device; 65. Dispersing plate; 66. Annular "Z" shaped dispersing device. Detailed Implementation

[0131] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0132] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0133] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0134] Example

[0135] Please see Figures 1 to 11 This invention provides a high-efficiency, low-resistivity coarse-fine gradient classifier. The high-efficiency, low-resistivity coarse-fine gradient classifier is formed from bottom to top as follows: an air distribution and material distribution zone, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return zone, and a medium-coarse powder and fine powder classification zone. Among them, the air distribution and material distribution zone and the pre-dispersion and coarse particle classification zone 10 (the part circled by the double dotted line) are the core parts of this invention.

[0136] The air distribution and material distribution area is located at the bottom of the equipment and includes an air inlet housing 27, an air inlet 47, a coarse particle outlet 28, a guide cone 36, and an annular air ring 25. The air inlet housing 27 surrounds the outermost part, forming a closed airflow guiding, dispersing, and sorting space. The air inlet housing 27 is located on the equipment foundation support 39. The air inlet 47 is located on the side of the air inlet housing 27, and the air intake form of the air inlet 47 is tangential or vertical. The coarse particle outlet 28 is located at the bottom of the air inlet housing 27. Multiple coarse particle outlets 28 are provided and are arranged in an annular mirror distribution to avoid interference with the lower coarse particle sorting drive 42. The guide cone 36 is located inside the air inlet housing 27 and is coaxially arranged. The shape of the guide cone 36 is an inverted frustum or a cylinder.

[0137] The annular air ring 25 is installed between the outer edge of the guide cone 36 and the inner edge of the top of the air inlet housing 27. The guide cone 36 is adjacent to the annular air ring 25. The upper outer edge of the annular air ring 25 is close to the lower edge of the lifting platform 34 and abuts against the inner wall of the air inlet housing 27. The upper inner edge of the annular air ring 25 is connected to the upper bearing seat support platform 26. The annular air ring 25 includes an inner ring 50, an outer ring 48, and several air ring guide vanes 49 inclined between the inner ring 50 and the outer ring 48. The lower edge of the inner ring 50 is fixed to the upper edge of the guide cone 36, and the upper bearing seat support platform 26 is fixed to the upper edge of the air ring 50.

[0138] The gap wind speed of the wind ring guide blade 49 is 18±2m / s; the angle θ2 between the wind ring guide blade 49 and the horizontal direction is 35~45°; the ratio S1:S2=0.3~0.8 of the horizontal projection overlap length of two adjacent wind ring guide blades 49 to the horizontal projection length of a single wind ring guide blade 49.

[0139] Above the annular air ring 25 is a pre-dispersing and coarse particle classification zone, which includes a coarse particle sorting shell 7, a lifting platform 34, a coarse particle sorting rotating cage 51, a feeding device 52, and a coarse particle sorting drive 42. The coarse particle sorting rotating cage 51 is located inside the coarse particle sorting shell 7. The coarse particle sorting rotating cage 51 includes coarse particle classification blades 21 located around the perimeter and cage cones 31 coaxially arranged inside the coarse particle classification blades 21. The coarse particle sorting rotating cage 51 is provided with an upper ring plate 17 at the top, a middle ring plate 20 in the middle, and a bottom ring plate 17 at the bottom. A lower ring plate 22 is provided in the part, and the coarse particle classifying blades 21 are located between the upper ring plate 17, the middle ring plate 20, and the lower ring plate 22, close to the outer edges of the upper ring plate 17, the middle ring plate 20, and the lower ring plate 22 and evenly radially distributed. A support cover plate 19 is provided above the coarse particle sorting shell 7 and the coarse particle classifying blades 21. The bottom surface of the support cover plate 19 is fixedly connected to the coarse particle sorting shell 7, and the bottom surface of the support cover plate 19 is connected to the upper ring plate 17 of the coarse particle sorting drum by a dynamic seal, forming the upper seal 18 of the coarse particle sorting drum. The support cover plate 19, the coarse particle sorting shell 7, and the coarse particle classifying blades 21 together constitute the coarse particle classification area. The inner edge of the top surface of the support cover plate 19 is connected to the outlet air duct 9 of the coarse particle sorting drum. The lower ring plate 22 of the coarse particle sorting drum 51 is connected to the inner ring 50 of the annular air ring 25 by a dynamic seal, forming the lower seal 15 of the coarse particle sorting drum.

[0140] The feeding device 52 is located at the top of the coarse particle grading zone and above the upper ring plate 17 of the coarse particle sorting drum 51. The feeding device 52 consists of a feeding disc 16 and dispersing blades 18. The feeding disc 16 is fastened to the upper ring plate 17 with bolts, and the dispersing blades 18 are evenly radially distributed on the feeding disc 16. Multiple feeding ports 30 are evenly provided on the support cover plate 19 corresponding to the position directly above the feeding disc 16. Each feeding port 30 is connected to a sub-feeding pipe 8-1, and they are all connected to the main feeding pipe 8. A lifting platform 34 is provided between the coarse particle sorting shell 7 and the air inlet shell 27. The lower side of the lifting platform 34 is adjacent to the annular air ring 25. The functions of the lifting platform 34 are: firstly, to cooperate with the airflow of the annular air ring 25 to guide the material to be sorted onto the inner wall of the upper shell, where it is dispersed by impact, thus increasing the coarse and fine grading; and secondly, to evenly distribute airflow to the coarse particle sorting drum 5.

[0141] The coarse particle sorting drive 42 is connected to the coarse particle sorting drum 51 via shaft system 1, and is used to drive the coarse particle sorting drum 51 to rotate; the coarse particle sorting drive 42 is located directly below the guide cone 36. The bottom end of the guide cone 36 is connected to the coarse material guide cone 38, and the guide cone 36 and the coarse material guide cone 38 together isolate the material flow and airflow outside the shaft system 1.

[0142] The feeding and coarse powder return zone and the coarse and fine powder classification zone 58 include a main feeding pipe 8, a coarse powder return pipe 6, and a fine classification device. The main feeding pipe 8 is connected to the corresponding feeding port 30 through each branch feeding pipe 8-1. The material to be classified is fed into the coarse particle classification zone for pre-dispersion through each branch feeding pipe 8-1. One end of the coarse powder return pipe 6 is connected to the lower part of the coarse powder return cone 57 of the fine classification device, and the other end passes through the fine classification shell. The coarse powder return pipes 6 are evenly distributed at equal angles. The fine classification shell is connected to the outlet air duct 9 of the coarse particle sorting drum to form a dust-laden airflow rising channel.

[0143] The fine grading device includes a fine grading shell 2, stationary blades 4, a fine powder sorting drum 3, a medium-coarse powder return cone 57, and a fine grading drive 1. The stationary blades 4 and the fine powder sorting drum 3 are both located on the inner side of the middle of the fine grading shell 2. The stationary blades 4 are concentrically distributed around the outer periphery of the fine powder sorting drum 3. A fine powder outlet is provided on the fine grading shell 2 above the fine powder sorting drum 3. The top of the medium-coarse powder return cone 57 is connected to the bottom of the stationary blades 4. The fine grading drive 1 is connected to the fine powder sorting drum 3 and is located on the fine grading shell 2 above the fine powder outlet.

[0144] Specifically, such as Figure 3 As shown, a coarse particle sorting drum upper seal 13 is provided around the bottom surface of the support cover plate 19 near the inner edge of the upper ring plate 17. The coarse particle sorting drum upper seal 13 is a "groove" type dynamic seal structure, and the "groove" type dynamic seal structure is close to the inner edge of the feeding device 52 to prevent coarse particles from passing directly through the coarse particle sorting drum 51 without sorting and entering the subsequent sorting process. The "groove" type dynamic seal structure consists of a dynamic sealing ring 23 and a dynamic sealing groove 24. The dynamic sealing ring 23 is fixed to the inner edge of the upper surface of the upper ring plate 17, and the dynamic sealing groove 24 is fixed to the bottom surface of the support cover plate 19. The dynamic sealing ring 23 extends into the dynamic sealing groove 24 and cooperates with the dynamic sealing groove 24. The cooperation gaps in all directions are 10-20mm.

[0145] like Figure 4As shown, a dynamic sealing outer ring 53 is fixedly connected to the lower outer edge of the lower ring plate 22, and a dynamic sealing inner ring 54 is provided on the inner ring 50 of the annular air ring 25. The dynamic sealing outer ring 53 and the dynamic sealing inner ring 54 cooperate to form the lower seal 15 of the coarse particle sorting drum. The dynamic sealing gap of the lower seal 15 of the coarse particle sorting drum is 10-20mm to prevent the material to be sorted from being discharged from the system through the inner ring 50 of the air ring and the guide cone 36. Specifically, the dynamic sealing inner ring 54 is fixedly connected to the upper edge of the inner ring 50 of the air ring and close to the outer edge of the upper bearing seat support platform 26, and the dynamic sealing outer ring 53 is fixedly connected to the lower side of the outer edge of the lower ring plate 22.

[0146] Both the upper seal 13 and the lower seal 15 of the coarse particle sorting drum are dynamic seals, ensuring that the coarse particle sorting drum 5 will not interfere or collide during rotation.

[0147] like Figure 5 As shown, the upper ring plate 17 is connected to the cage cone 31 via the rotating cage tie rod 12. The arrangement direction of the rotating cage tie rod 12 is consistent with the rotation direction of the coarse particle sorting rotating cage 51 and is evenly distributed along the axis of the coarse particle sorting rotating cage 51. The inner edge of the lower ring plate 22 is connected to the cage cone 31. The outer edge of the middle ring plate 20 is connected to the coarse particle grading blade 21, and the inner edge is connected to the cage cone 31 via tie rods or stiffeners. The middle ring plate 20 strengthens and fixes the coarse particle grading blade 21. The upper ring plate 17, middle ring plate 20, and lower ring plate 22 are located at the upper, middle, and lower parts of the coarse particle sorting rotating cage 51, respectively. The upper ring plate 17, middle ring plate 20, lower ring plate 22, rotating cage tie rod 12, and cage cone 31 together constitute the cage frame.

[0148] like Figure 5 As shown, the shaft system includes a main shaft 41 and a main shaft sleeve 35 sleeved on the main shaft 41. A hub 14 is provided on the top of the main shaft 41, and the upper part of the hub 14 is connected to the cage cone 31. Specifically, the upper part of the main shaft 41 is supported by a bearing assembly installed in the upper bearing seat 11, and the lower part is supported by a bearing assembly installed in the lower bearing seat 37. The upper and lower bearing seats are arranged coaxially. There are bearing seat supports 32 around the outer side of the upper bearing seat 11. The bearing seat supports 32 are connected to the ear plate 33. The ear plate 33 is connected to the upper bearing seat support platform 26. The radial force is transmitted to the air inlet shell 27 through the upper bearing seat support platform 26 and the annular air ring 25. A support flange 40 is provided on the outer side of the lower bearing seat 37. The support flange 40 is connected to the equipment foundation support 39. The axial force is transmitted to the civil foundation through the equipment foundation support 39. The drive device base 29 is connected below the equipment foundation support 39. The lower coarse particle sorting drive 42 is connected below the drive device base 29. The lower coarse particle sorting drive 42 is the power source for the entire coarse particle sorting drum 51 and the feeding device 52.

[0149] like Figure 9As shown, in order to further achieve more levels of sorting or ultra-fine sorting, a dust-laden airflow can be introduced in series with the grading equipment or grinding equipment 56 in a wind-swept manner. Specifically, the air inlet 47 is connected to the grading equipment (such as a static classifier) ​​or the grinding equipment (such as a wind-swept mill), and the dust-laden airflow to be sorted is introduced into the air inlet housing 27 in a wind-swept manner.

[0150] like Figure 2 As shown, a return control device 5 is installed inside the medium-coarse powder return cone 57. The return control device 5 includes a medium-coarse powder guide cone 46, a medium-coarse powder distribution cone 45, and a medium-coarse powder circulation pipe 5-2. An annular area for collecting medium-coarse powder is formed between the medium-coarse powder guide cone 46 and the medium-coarse powder return cone 57. Several medium-coarse powder distribution cones 45 are evenly distributed along the circumference of this annular area. Each medium-coarse powder distribution cone 45 consists of two plates stacked together in a ridge shape. Together with the central medium-coarse powder guide cone 46, the medium-coarse powder distribution cones 45 divide the annular area into several funnel-shaped material zones. Each funnel-shaped material zone has a return pipe interface 44 at its bottom. The return pipe interface 44 is funnel-shaped, wider at the top and narrower at the bottom, completely preventing material accumulation. The lower end of the return pipe interface 44 is connected to a return chute 43, and the lower end of the return chute 43 is connected to a medium-coarse powder return pipe 6. The return chute 43 and the medium-coarse powder return pipe 5-2 are connected... The two pipes 6 are connected by bolts, and the position and angle of the medium and coarse powder return are adjusted according to the material flow direction required by the process. The medium and coarse powder guide cone 46 is provided with a medium and coarse powder overflow hole 5-1 at the top and a medium and coarse powder discharge hole 5-3 at the bottom. The upper end of the medium and coarse powder circulation pipe 5-2 is connected to the medium and coarse powder discharge hole 5-3, and the lower end is connected to the feed pipe 8-1. It is used to guide part of the medium and coarse powder overflowing through the medium and coarse powder overflow hole 5-1 into the feed pipe 8-1, and then enter the coarse particle sorting area for secondary sorting through the material distribution device 52. The medium and coarse powder return pipe 6 is provided with a medium and coarse powder return control valve 55, which is used to adjust the balance of medium and coarse powder entering the subsequent medium and coarse powder fine grinding process and the secondary sorting of medium and coarse powder.

[0151] like Figure 8 As shown, to further realize the flexible arrangement requirements of the coarse particle sorting section, the medium-coarse powder and fine powder sorting section, specifically, the air distribution and material distribution area and the pre-dispersing and coarse particle classification area 10, and the feeding and medium-coarse powder return area and the medium-coarse powder and fine powder classification area 58 can be used as two independent parts, arranged at different heights according to process requirements. In this case, the coarse particle sorting drum outlet air duct 9 is replaced with a non-standard connecting air duct 60. The air distribution and material distribution area and the pre-dispersing and coarse particle classification area 10 are located at the bottom and are connected to the medium-coarse powder and fine powder classification area 58 through the non-standard connecting air duct 60. The medium-coarse powder and fine powder classification area 58 is fixed to the platform at the process elevation through the support 59.

[0152] To further improve the clarity of particle classification, specifically, an annular "stepped" shaped dispersing device 63 is provided below the annular air ring 25 and inside the air inlet housing 27 (see...). Figure 10 ) or a ring-shaped "Z" shaped dispersing device 65 (see Figure 11 The dispersing plates 64 of the annular "stepped" dispersing device 63 are all supported on the inner wall of the air inlet housing 27 by the support device 61, and are arranged in a stepped structure with a certain spacing. Adjacent dispersing plates 64 are connected by connecting ribs 62. The dispersing plates 64 of the annular "Z" shaped dispersing device 65 are partly supported on the inner wall of the air inlet housing 27 by the support device 61, and partly supported on the outer wall of the guide cone 36 by the support device 61. The dispersing plates 64 on both sides are arranged in a stepped structure with a certain spacing, and a dispersing and grading channel is formed between adjacent dispersing plates 64, corresponding to each other. The working principle is as follows: The material falling through the annular air ring 25 falls at a certain speed under the action of gravity to the annular "step" shaped dispersing device 63 or the annular "Z" shaped dispersing device 65. After being impacted by their respective dispersing plates 64, the material is dispersed and then blown by the rising airflow between the dispersing plates 64. Small particles pass upward through the annular air ring 25 and enter the coarse particle sorting area for further sorting, while large particles leave the classifier through the coarse particle outlet 28 and enter the coarse particle collection bin, returning to the grinding host (roller press, vertical mill, etc.) for further grinding.

[0153] The classification method of the above-mentioned high-efficiency, low-resistivity coarse-fine gradient classifier is as follows:

[0154] The material to be sorted is fed into the various feed pipes 8-1 evenly distributed on the upper part of the support cover plate 19 through the main feed pipe 8. Then it enters the distribution disc 16 that rotates with the coarse particle sorting drum 51 and is dispersed and thrown out of the distribution disc 16 by the distribution disc 16 and the dispersing blades 18 fixed thereon. Then, under the action of gravity, it passes downward through the coarse particle classification zone. The medium and coarse powder and fine powder that meet the fineness requirements enter the coarse particle sorting drum 51 and enter the subsequent fine sorting process with the airflow. The coarse particles that do not meet the fineness requirements and the small amount of medium and coarse powder and fine powder mixed between the coarse particles continue to enter the annular air ring 25 and are dispersed by the air ring guide blades 49 of the annular air ring 25 and the annular "stepped" shaped dispersing device 63 or annular "Z" shaped dispersing device below the annular air ring 25. 65 Further dispersing and grading ensures that the small amount of medium and coarse powder and fine powder mixed in the "clump" of material flow, as well as the fine powder adhering to the surface of coarse particles, are fully dispersed and detached; the sorting airflow enters from the air inlet 1 on the lower side of the air distribution and material distribution area, and is evenly distributed under the combined action of the coarse material guide cone 38, the guide cone 36, and the air inlet shell 27, and blows the dispersed material at high speed. Most of the coarse particles enter the coarse particle outlet 28 downwards and return to the material bed extrusion equipment for further grinding, while a small portion of coarse particles, most of the medium and coarse powder and fine powder enter the coarse particle sorting area upwards with the airflow for secondary sorting; the coarse particle sorting drum 51 rotates to form a forced vortex field, thus enabling more precise control to prevent coarse particles from passing through the coarse particle grading blades 21 and entering the subsequent grading process. After being sorted (passing through the coarse particle classifying blades 21), the dust-laden airflow ascends along the dust-laden airflow rising channel into the subsequent medium-coarse and fine powder classification zone 58. The fine classification device (guided by the stationary blades 4, and then by the rotation of the fine powder classification drum 3) completes the fine classification of the medium-coarse and fine powders in the airflow passing through the stationary blades 4. The sorted fine powder is collected as finished product. The medium-coarse powder, through the return material control device 5, the medium-coarse powder return material control valve 55, the medium-coarse powder return pipe 6, the medium-coarse powder overflow hole 5-1, and the medium-coarse powder circulation pipe 5-2, mostly enters the fine grinding equipment for further grinding, while a small portion returns to the coarse particle classification zone for secondary classification, in order to maximize the powder classification efficiency of the medium-coarse powder. By feeding from the top of the coarse particle classification zone, the coarse particle classification clarity is improved, the classifier resistance is lower, and the service life of wear parts is extended.

[0155] The process structure parameters of the present invention are as follows: Figures 12-14 As shown, to facilitate the explanation of the design method of the present invention, the following main process structure parameters are set:

[0156] System design output P (t / h), material bulk density ρ s (t / m 3 Material flow velocity V s (m / s), material filling rate ε=0.5~0.8, system circulating load k, powder concentration C s (g / m 3 ), feed concentration F s(kg / m 3 The system's powder selection air volume Q (m³) 3 / h), coarse particle sorting drum 51 diameter D1 (mm), coarse particle sorting drum 51 height H1 (mm), coarse particle sorting drum 51 diameter-to-height ratio D / H, lower ring plate outer diameter D2 (mm), cloth disc 16 inner diameter D 2i (mm), Fabric tray 16 outer diameter D 2o (mm), the blade height h is 18. s (mm), coarse particle sorting drum outlet air duct 9 diameter D3 (mm), feed pipe 8-1 diameter D4 (mm), upper end diameter of coarse particle sorting shell inner cavity D5 (mm), inner ring of air ring 50 diameter D6 (mm), outer ring of air ring 48 diameter or air inlet shell 27 inner diameter D7 (mm), guide cone 36 - coarse material guide cone interface diameter D8 (mm), annular air ring 25 height H2 (mm), lifting platform 34 height The vertical clearance H3 (mm) between the lower edge of the return pipe interface 44 and the bottom of the medium-coarse powder return cone 57, the vertical clearance H5 (mm) between the lower edge of the medium-coarse powder overflow hole 5-1 and the upper edge of the return pipe interface 44, the diameter d2 (mm) of the medium-coarse powder return pipe 6, the number of medium-coarse powder return pipes n1, the diameter d3 (mm) of the medium-coarse powder overflow hole 5-1, and the diameter d of the medium-coarse powder discharge hole and the medium-coarse powder circulation pipe 5-2. 10 (mm), the angle between the inner ring 50 and the horizontal direction is θ1 (°), the number of air guide blades 49 in the air ring is n3 (pieces), the thickness of the air guide blades 49 in the air ring is t (mm), the angle between the air guide blades 49 and the horizontal direction is θ2 (°), the angle between the guide cone 36 and the horizontal direction is θ3 (°), the angle between the lifting platform 34 and the horizontal direction is θ4 (°), the angle between the guide cone and the horizontal direction is θ5 (°), the angle between the coarse particle sorting shell and the horizontal direction is θ6 (°), the angle between the return control device 5 and the horizontal direction is θ7 (°), the angle between the line connecting the lower edge of the medium and coarse powder overflow hole and the upper edge of the medium and coarse powder return cone is θ9 (°), the outlet wind speed of the coarse particle sorting drum 51 is V1 (m / s), the radial wind speed of the coarse particle sorting drum 51 is V2 (m / s), and the outlet wind speed of the annular air ring 25 is... Speed ​​V3 (m / s), gap velocity of the air ring guide vane 49 (effective air velocity of the annular air ring 25) V4 (m / s), boost velocity of the air inlet 47 V5 (m / s), blowing velocity of the annular "stepped" shaped dispersing device V6 (m / s), blowing velocity of the annular "Z" shaped dispersing device V7 (m / s), gap d1 (mm) between two adjacent air ring guide vanes 49, horizontal projection length S2 (mm) of the air ring guide vane 49, horizontal projection overlap length S1 (mm) of two adjacent air ring guide vanes 49, gap (from top to bottom) of two adjacent dispersing plates of the annular "stepped" shaped dispersing device d4 (mm), d5 (mm), d6 (mm), lower diameter (from top to bottom) of the dispersing plate of the annular "stepped" shaped dispersing device D9 (mm), D10 (mm), D 11 (mm), D 12 (mm), the overlapping distance of the generatrix projection of two adjacent dispersing plates of the annular "stepped" dispersing device (from top to bottom) S3 (mm), S4 (mm), S5 (mm), the gap between two adjacent dispersing plates of the annular "Z" shaped dispersing device (from top to bottom) d7 (mm), d8 (mm), d9 (mm), the diameter of the lower end of the dispersing plate of the annular "Z" shaped dispersing device (from top to bottom) D 13 (mm), D 14 (mm), D 15 (mm), D 16 (mm), the distances from the projection point of the end of the upper dispersing plate of the annular "Z" shaped dispersing device to the end of the dispersing plate are S7 (mm), S8 (mm), and S9 (mm), and the angle θ8 (°) between each dispersing plate of the annular "stepped" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction.

[0157] The calculation steps for the above main process parameters are as follows:

[0158] 1) System powder selection air volume Q (m³) 3 / h):

[0159] Based on the system design output P (t / h), system circulating load k, and powder concentration C... s (g / m 3 ), feed concentration F s (kg / m 3 ), calculate the air volume Q (m³) of the powder selection system. 3 / h):

[0160]

[0161] Wherein, the system cyclic load k = 3 ± 1, and the powder concentration C s =800±200g / m 3 Feed concentration F s =2.5±0.5kg / m 3 ;

[0162] 2) Diameter D1 (mm) of coarse particle sorting rotary drum 51:

[0163]

[0164] Wherein, D / H is the diameter-to-height ratio of the coarse particle sorting drum, D / H = 1.8 to 2.0, and V2 is the radial wind speed of the coarse particle sorting drum, V2 = 1.5 to 2.5 (m / s);

[0165] 3) Height H1 (mm) of coarse particle sorting drum 51:

[0166]

[0167] 4) Lower ring plate 22 outer diameter D2 (mm):

[0168] D2 = D1 - (0 ~ 50) (4)

[0169] 5) Fabric disc 16 outer diameter D 2o (mm), Fabric tray 16 inner diameter D 2i (mm), height h of the broken blades 18 s (mm):

[0170] D 2i =D3+(150~250) (5)

[0171] D 2O =D 2i +(500~700) (6)

[0172] h s =100±50 (7)

[0173] 6) Inner ring of the wind ring, 50mm diameter D6 (mm):

[0174] D6 = D2 - (40~60) (8)

[0175] 7) Outer diameter of the air ring: 48mm or inner diameter of the air inlet casing: 27mm (D7mm):

[0176]

[0177] Where V3 is the outlet wind speed of the annular wind ring, V3=10±2(m / s);

[0178] 8) Flow guide cone 36 - Coarse material guide cone 38 interface diameter D8 (mm):

[0179]

[0180] Wherein, V5 is the air inlet boost velocity, V5 = 3~5 (m / s);

[0181] 9) Diameter D5 (mm) of the upper end of the inner cavity of the coarse particle sorting shell 7:

[0182] D5=D1+(400±100)mm (11)

[0183] 10) Feed pipe 8-1, diameter D4 (mm):

[0184]

[0185] Wherein, the system cyclic load k = 3 ± 1, and the material bulk density ρs =1.5~1.8 (t / m3), material flow velocity V s =1±0.5(m / s), material filling rate ε=0.5~0.8, i is the number of feed tubes, generally 2~4;

[0186] 11) Diameter D3 (mm) of the outlet duct of the coarse particle sorting rotary drum:

[0187]

[0188] Wherein, V1 is the outlet wind speed of the coarse particle sorting drum, V1 = 10~15 (m / s);

[0189] 12) Number of medium and coarse powder return pipes (n1):

[0190] n1=3±1 (14)

[0191] 13) Diameter d2 (mm) of medium and coarse powder return pipe 6:

[0192]

[0193] Wherein, the system cyclic load k = 3 ± 1, and the material bulk density ρ s =1.5~1.8 (t / m 3 Material flow velocity V s =1±0.5(m / s), material filling rate ε=0.5~0.8, number of medium and coarse powder return pipes n1=3 (pieces);

[0194] 14) The diameter of the overflow hole 5-1 for medium and coarse powder is d3 (mm), and the diameter of the discharge hole 5-3 and the circulating material pipe 5-2 for medium and coarse powder is d3 (mm). 10 (mm):

[0195] d3=d 10 =d2 (16)

[0196] 15) Number of wind ring guide vanes: n3 (units):

[0197]

[0198] Where d1 is the gap between two adjacent wind ring guide vanes, d1 = 100 ~ 200 (mm), V4 is the gap wind speed of the wind ring guide vanes, V4 = 18 ± 2 (m / s), and n3 is rounded to the nearest integer.

[0199] 16) Height H2 (mm) of the annular air ring 25:

[0200]

[0201] Wherein, θ2 is the angle between the wind ring guide blade and the horizontal direction, θ2=40±5(°); S1 / S2 is the ratio of the horizontal projection overlap length of two adjacent wind ring guide blades to the horizontal projection length of a single wind ring guide blade, S1 / S2=0.3~0.8; t is the thickness of the wind ring guide blade, t=10~20(mm);

[0202] 17) Height H3 (mm) of the lifting platform 34:

[0203] H3=(0.2±0.05)H1 (19)

[0204] 18) The vertical clearance H4 (mm) between the lower edge of the return pipe interface 44 and the bottom of the medium-coarse powder return cone 57:

[0205] H4=200±50 (20)

[0206] 19) The vertical gap H5 (mm) between the lower edge of the medium-coarse powder overflow hole 5-1 and the upper edge of the return pipe interface 44:

[0207] H5=300±50 (21)

[0208] 20) The angle θ1 (°) between the inner ring of the wind ring and the horizontal direction is 50°:

[0209] θ1=60±10 (22)

[0210] 21) The angle θ3 (°) between the guide cone 36 and the horizontal direction:

[0211] θ3=60±10 (23)

[0212] 22) The angle θ4 (°) between the lifting platform 34 and the horizontal direction:

[0213] θ4=50±5 (24)

[0214] 23) The angle between the coarse material guide cone 38 and the horizontal direction is θ5 (°):

[0215] θ5=60±5 (25)

[0216] 24) The coarse particle sorting shell 7 has an angle θ6 (°) with the horizontal direction:

[0217] θ6=70±5 (26)

[0218] 25) The angle between the 46 and horizontal directions of the medium and coarse powder guide cone is θ7 (°):

[0219] θ7=65±10 (27)

[0220] 26) The line connecting the lower edge of the medium-coarse powder overflow hole 5-1 and the upper edge of the medium-coarse powder return cone 57 is in the same horizontal direction, with an included angle θ9 (°):

[0221] θ9=45±10 (28)

[0222] 27) The diameter of the lower end of the dispersing plate of the annular "stepped" dispersing device 63, from top to bottom, is D9 (mm), D... 10 (mm), D 11 (mm), D 12 (mm):

[0223]

[0224] D 12 =D8+(500~600) (30)

[0225]

[0226]

[0227] 28) The gaps between two adjacent dispersing plates of the annular "stepped" dispersing device 63, from top to bottom, are d4 (mm), d5 (mm), and d6 (mm), respectively:

[0228]

[0229] Among them, V6=14±2 is the blowing speed (m / s) of the annular "stepped" shaped dispersing device;

[0230] 29) The diameter of the lower end of the dispersing plate of the annular "Z"-shaped dispersing device 65, from top to bottom, is D 13 (mm), D 14 (mm), D 15 (mm), D 16 (mm):

[0231]

[0232]

[0233] 30) The gaps between two adjacent dispersing plates of the annular "Z"-shaped dispersing device 65, from top to bottom, are d7 (mm), d8 (mm), and d9 (mm), respectively:

[0234]

[0235]

[0236]

[0237] Among them, V7 is the blowing speed of the annular "Z"-shaped dispersing device, V7=14±2(m / s);

[0238] 31) The overlap distances of the generatrix projections of two adjacent dispersing plates of the annular "stepped" dispersing device 63, from top to bottom, are S3 (mm), S4 (mm), and S5 (mm):

[0239] S3=S4=S5=150±50 (39)

[0240] If S3, S4, and S5 do not meet the requirements of equation (39), then D9 and D can be adjusted appropriately. 10 D 11 Calculated value;

[0241] 32) The distances from the projection point of the end of the upper dispersing plate onto the lower dispersing plate of the annular "Z"-shaped dispersing device 65 to the end of the dispersing plate, from top to bottom, are S7 (mm), S8 (mm), and S9 (mm):

[0242] S7=S8=S9=150±50 (40)

[0243] If S7, S8, and S9 do not meet the requirements of equation (40), then D can be adjusted appropriately. 14 D 15 D 16 Calculated value;

[0244] 33) The angle θ8 (°) between the dispersing plates of the annular "stepped" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction:

[0245] θ8=45±5 (41).

[0246] To verify the technical effects of this invention, a semi-industrial combined grinding test system based on TRP ф400x100mm-ф750x2500mm was designed, with a system air volume of 4000m³ / h for powder selection. 3 A high-efficiency, low-resistance coarse-fine gradient classifier with specifications CEф300*550-Fф300-570mm was used in a comparative study of 28 groups of grinding PO425 cement with the existing V-type classifier in the same system under basically the same working conditions. The statistical data of the tests are shown in Table 1.

[0247] Table 1 Comparison of the air classifier of the present invention with the traditional V-classifier.

[0248]

[0249]

[0250] As shown in Table 1, compared to traditional V-separation technology, under essentially the same operating conditions, the separation efficiency for particles >0.2mm decreased significantly, with a cumulative decrease of 42.0%, while the separation efficiency for fine particles ≤0.2mm increased by 23.7%. The reduced separation efficiency for coarse particles means more coarse particles return to the grinding equipment, while the increased separation efficiency for small particles ≤0.2mm means more finished particles leave the grinding equipment without returning for further grinding, thus disrupting the material layer stability and reducing grinding efficiency. Therefore, the separation clarity of this invention is significantly improved, solving the common problem of unclear separation in traditional V-separation, where there is "coarse within fine and fine within coarse," and achieving the intended purpose.

[0251] According to the experimental statistics in Table 1, in terms of system performance improvement, the system hourly rate increased from 1.39 t / h to 1.71 t / h, an increase of 23%, and the specific surface area of ​​the finished product increased from 3210 cm². 2 / g increased to 3556cm 2 / g, an increase of 10.8%, significantly improving the quality of the finished product. Regarding the main machine output, thanks to the classifying performance that "the classifying efficiency for particles >0.2mm is significantly reduced, while the classifying efficiency for particles ≤0.2mm is increased," the amount of fine powder returning to the roller press is greatly reduced, improving the stability of the material layer. The roller press's absorbed power increased from 17.1kW to 19.8kW, an increase of 15.8%, significantly increasing the main machine output and providing an important guarantee for increasing production and reducing consumption. Regarding the main machine's power consumption, although the nominal power consumption reduction is not significant, when converted to the same 3200cm³... 2 The equivalent comparable power consumption per g specific surface area decreased from 23.1 kWh / t to 18.2 kWh / t, a decrease of 21.0%; the sorting resistance decreased from 1330 Pa to 1220 Pa, a decrease of 8.2%.

[0252] In summary, compared with traditional V-selection technology, the present invention has a significant effect on increasing production and reducing consumption.

[0253] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-efficiency, low-resistance coarse-fine gradient classifier, characterized in that: The coarse and fine gradient classifier consists of a series of interconnected zones from bottom to top: a distribution zone, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return zone, and a medium-coarse powder and fine powder classification zone. The air distribution area includes an air inlet housing, an air inlet, a coarse particle outlet, a guide cone, and an annular air ring. The air inlet is located on the side of the air inlet housing, the coarse particle outlet is located at the bottom of the air inlet housing, the guide cone is located inside the air inlet housing and is arranged coaxially, and the annular air ring is installed between the outer edge above the guide cone and the inner edge of the top of the air inlet housing. The pre-dispersing and coarse particle classification zone includes a coarse particle sorting shell, a coarse particle sorting rotating cage, a feeding device, and a coarse particle sorting drive. The coarse particle sorting rotating cage is located inside the coarse particle sorting shell. The coarse particle sorting rotating cage includes coarse particle classification blades located around the perimeter and cage cones coaxially arranged inside the coarse particle classification blades. The top of the coarse particle sorting rotating cage is provided with an upper ring plate, the middle with a middle ring plate, and the bottom with a lower ring plate. The coarse particle classification blades are located between the upper, middle, and lower ring plates, close to the outer edges of the upper, middle, and lower ring plates, and are evenly radially distributed. A support cover plate is installed above the particle sorting shell and the coarse particle grading blades. The bottom surface of the support cover plate is fixedly connected to the coarse particle sorting shell, and the bottom surface of the support cover plate is connected to the upper ring plate of the coarse particle sorting drum in a dynamic sealing manner, forming the upper seal of the coarse particle sorting drum. The support cover plate, the coarse particle sorting shell, and the coarse particle grading blades together form the coarse particle grading zone. The inner edge of the top surface of the support cover plate is connected to the outlet air duct of the coarse particle sorting drum. The lower ring plate of the coarse particle sorting drum is connected to the inner ring of the annular air ring in a dynamic sealing manner, forming the lower seal of the coarse particle sorting drum. The feeding device is located at the top of the coarse particle grading zone and above the upper ring plate of the coarse particle sorting drum. The feeding device consists of a feeding disc and dispersing blades. The feeding disc is fastened to the upper ring plate by bolts. The dispersing blades are evenly radially distributed on the feeding disc. Multiple feeding ports are evenly opened on the support cover plate corresponding to the position directly above the feeding disc. A lifting platform is provided between the coarse particle sorting shell and the air inlet shell, and the lower side of the lifting platform is adjacent to the annular air ring. The coarse particle sorting drive is connected to the coarse particle sorting rotating drum via a shaft system 1, and is used to drive the coarse particle sorting rotating drum to rotate. The feeding and coarse powder return area and the coarse and fine powder classification area include a main feeding pipe, a coarse powder return pipe and a fine classification device. The main feeding pipe is connected to the corresponding feeding port through various branch feeding pipes. One end of the coarse powder return pipe is connected to the coarse powder return cone of the fine classification device, and the other end extends out of the fine classification shell. The fine classification shell is connected to the outlet air duct of the coarse particle sorting drum, forming a dust-laden airflow rising channel.

2. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The coarse particle sorting drum is sealed with a "groove" type dynamic seal structure, and the "groove" type dynamic seal structure is close to the inner edge of the feeding device; the "groove" type dynamic seal structure consists of a dynamic sealing ring and a dynamic sealing groove. The dynamic sealing ring is fixed to the inner edge of the upper ring plate, and the dynamic sealing groove is fixed to the bottom surface of the support cover plate. The dynamic sealing ring extends into the dynamic sealing groove and cooperates with the dynamic sealing groove. The clearance between the upper, lower, left and right sides is 10~20mm.

3. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, A dynamic sealing outer ring is fixed to the lower outer edge of the lower ring plate, and a dynamic sealing inner ring is provided on the inner ring of the annular air ring. The dynamic sealing outer ring and the dynamic sealing inner ring cooperate to form the lower seal of the coarse particle sorting drum. The dynamic sealing gap of the lower seal of the coarse particle sorting drum is 10~20mm.

4. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The upper ring plate is connected to the cage cone via a rotating cage tie rod. The rotating cage tie rod is arranged in the same direction as the rotation direction of the coarse particle sorting rotating cage and is evenly distributed along the axis of the coarse particle sorting rotating cage. The inner edge of the lower ring plate is connected to the cage cone. The inner edge of the middle ring plate is connected to the cage cone via a tie rod or a stiffening plate.

5. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The shaft system includes a main shaft and a main shaft sleeve fitted on the main shaft. A hub is provided at the top of the main shaft, and the hub is connected to the cage cone.

6. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The air distribution and material distribution area and the pre-dispersing and coarse particle classification area, as well as the feeding and medium-coarse powder return area and the medium-coarse powder and fine powder classification area, can be used as two independent parts. They can be arranged at different heights according to process requirements. In this case, the outlet air duct of the coarse particle sorting drum is replaced with a non-standard connecting air duct. The air distribution and material distribution area and the pre-dispersing and coarse particle classification area are connected to the medium-coarse powder and fine powder classification area through the non-standard connecting air duct.

7. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The air inlet is connected to a grading device or a grinding device, and introduces the dust-laden airflow to be sorted into the air inlet housing in a wind-sweeping manner.

8. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, Below the annular air ring, an annular "stepped" shaped dispersing device or an annular "Z" shaped dispersing device is provided in the inner cavity of the air inlet housing; The dispersing plates of the annular "stepped" dispersing device are arranged in a stepped structure with a certain spacing. The overlap distance of the generatrix projection of two adjacent dispersing plates is 100-200 mm. Each dispersing plate is supported on the inner wall of the air inlet shell by a support device, and the dispersing plates are connected by connecting ribs. The dispersing plates of the annular "Z"-shaped dispersing device are partially supported on the inner wall of the air inlet housing by a support device, and partially supported on the outer wall of the guide cone by a support device. The dispersing plates on both sides are arranged in a stepped structure with a certain spacing. A dispersing and grading channel is formed between two adjacent dispersing plates on both sides, corresponding to each other. The distance from the end of the upper dispersing plate to the end of the lower dispersing plate is 100-200 mm. The angle between the dispersing plates of the annular "stepped" dispersing device and the annular "Z"-shaped dispersing device and the horizontal direction is... θ 8 represents 40–50°.

9. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The annular wind ring includes an inner ring, an outer ring, and several wind ring guide vanes inclined between the inner and outer rings; the gap velocity of the wind ring guide vanes is 18±2 m / s; the angle between the wind ring guide vanes and the horizontal direction is... θ 2 is 35-45°; the ratio of the horizontal projection overlap length of two adjacent wind ring guide blades to the horizontal projection length of a single wind ring guide blade, S1:S2 = 0.3-0.

8.

10. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, The bottom end of the guide cone is connected to a coarse material guide cone.

11. The high-efficiency, low-resistivity coarse-fine gradient classifier according to claim 1, characterized in that, A return control device is installed inside the medium-coarse powder return cone. This device includes a medium-coarse powder guide cone, a medium-coarse powder distribution cone, and a medium-coarse powder circulation pipe. An annular area for collecting medium-coarse powder is formed between the medium-coarse powder guide cone and the medium-coarse powder return cone. Several medium-coarse powder distribution cones are evenly distributed along the circumference of this annular area. Each distribution cone consists of two plates joined together in a ridge shape. Together with the central medium-coarse powder guide cone, the distribution cones divide the annular area into several funnel-shaped material zones. Each funnel-shaped material zone has a return pipe interface at its bottom. The return pipe interface is funnel-shaped, wider at the top and narrower at the bottom. The lower end of the return pipe interface is connected to the medium-coarse powder return pipe. The upper part of the medium-coarse powder guide cone is provided with a medium-coarse powder overflow hole, and the lower part is provided with a medium-coarse powder discharge hole. The upper end of the medium-coarse powder circulation pipe is connected to the medium-coarse powder discharge hole, and the lower end is connected to the feed pipe. It is used to guide part of the medium-coarse powder overflowing through the medium-coarse powder overflow hole into the feed pipe and then into the coarse particle sorting area for secondary sorting. The medium-coarse powder return pipe is provided with a medium-coarse powder return control valve to adjust the balance between the medium-coarse powder entering the subsequent medium-coarse powder fine grinding process and the secondary sorting of medium-coarse powder.

12. A classification method based on the high-efficiency, low-resistivity coarse-fine gradient classifier according to any one of claims 1 to 11, characterized in that, The material to be sorted is fed into the various feed pipes evenly distributed above the support cover plate through the main feed pipe. It then enters the distribution disc, which rotates with the coarse particle sorting drum. The material is dispersed and thrown out of the distribution disc by the disc and the dispersing blades fixed to it. Under gravity, it flows downwards through the coarse particle classification zone. Medium and fine particles that meet the fineness requirements enter the coarse particle sorting drum and are carried by the airflow into the subsequent fine sorting process. Coarse particles that do not meet the fineness requirements, along with a small amount of medium and fine particles mixed in between, continue downwards into the annular air ring. There, they are further dispersed and classified by the air ring's guide vanes, ensuring that the small amount of medium and fine particles mixed in the material flow and the fine particles adhering to the surface of the coarse particles are fully dispersed and removed. The sorting airflow enters through the air inlet and is evenly distributed, then high-speed blows the material being separated. The loose material undergoes the first coarse particle classification. Most of the coarse particles return to the material bed extrusion equipment for further grinding under gravity. A small portion of the coarse particles, most of the medium and coarse powder, and fine powder are carried upward by the sorting airflow through the annular air ring and enter the coarse particle sorting zone to complete the second coarse and fine particle classification. The dust-laden airflow after sorting enters the subsequent medium and coarse powder and fine powder classification zone along the dust-laden airflow rising channel. The fine classification device completes the fine classification of the medium and coarse powder and fine powder through the dust-laden airflow passing through the stationary blades. The sorted fine powder is collected as finished product. The medium and coarse powder is processed through the return control device, the medium and coarse powder return control valve, the medium and coarse powder return pipe, the medium and coarse powder overflow hole, and the medium and coarse powder circulation pipe. Most of the medium and coarse powder enters the fine grinding equipment for further grinding, while a small portion returns to the coarse particle sorting zone for secondary sorting.

13. A design method for a high-efficiency, low-resistivity coarse-fine gradient classifier based on any one of claims 1 to 11, characterized in that, This includes setting the following process structure parameters: 1) System powder selection air volume Q : Based on system design output P System cyclic load k Powder concentration C s Feed concentration F s Calculate the air volume of the powder selection system Q : in, Q The unit is m 3 / h, P The unit is t / h, system cyclic load. Powder concentration g / m 3 Feed concentration kg / m 3 ; 2) Diameter of the coarse particle sorting drum D 1: in, D The unit of 1 is mm; For coarse particle sorting, the diameter-to-height ratio of the rotating drum is... =1.8~2.0, V 2 represents the radial velocity of the coarse particle sorting drum. V 2 = 1.5~2.5 m / s; 3) Coarse particle sorting drum height H 1: 4) Outer diameter of the lower ring plate D 2: 5) Outer diameter of the fabric tray D 2O Inner diameter of fabric tray D 2i , Disperse the height of the blades h s : 6) Inner diameter of the wind ring D 6: in, H 1. D 2. D 2O , D 2i , h s , D The unit for 6 is mm; 7) Diameter of the outer ring of the air circumference or the inner diameter of the air inlet casing D 7: in, D The unit for 7 is mm; This refers to the outlet wind speed of the annular wind ring. m / s; 8) Diameter of the guide cone-coarse material guide cone interface D 8: in, D The unit of 8 is mm. To increase the airflow speed at the air inlet, V 5 = 3~5 m / s; 9) Diameter of the upper end of the inner cavity of the coarse particle sorting shell D 5: 10) Feed pipe diameter D 4: in, D The unit of 5 is mm. D The unit of 4 is mm, representing the system cyclic load. Material bulk density t / m 3 Material flow rate m / s, material filling rate , i The number of feed tubes; 11) Diameter of the outlet duct of the coarse particle sorting rotary drum D 3: in, D The unit of 3 is mm. For the outlet air velocity of the coarse particle sorting drum, V 1 = 10~15 m / s; 12) Number of medium and coarse powder return pipes n 1: 13) Diameter of medium and coarse powder return pipe d 2: in, d The unit of 2 is mm, and the system cyclic load is... Material bulk density t / m 3 Material flow rate m / s, material filling rate Number of medium and coarse powder return pipes indivual; 14) Diameter of overflow hole for medium and coarse powder d 3. Diameter of the discharge port and circulating feed pipe for medium and coarse powder d 10 : 15) Number of air guide blades in the air ring n 3: in, This refers to the gap between two adjacent wind ring guide blades. mm, The gap velocity of the wind ring guide vanes. m / s, n 3. Round to the nearest integer; 16) Height of the Annular Wind Ring H 2: in, H The unit of 2 is mm. The angle between the wind ring guide vanes and the horizontal direction. ; It is the ratio of the horizontal projection overlap length of two adjacent wind ring guide vanes to the horizontal projection length of a single wind ring guide vane. ; t The thickness of the wind ring guide blades. t= 10~20 mm; 17) Height of the lifting platform H 3: 18) Vertical gap between the lower edge of the return pipe interface and the bottom of the medium-coarse powder return cone hopper H 4: 19) Vertical gap between the lower edge of the overflow hole for medium and coarse powder and the upper edge of the return pipe interface H 5: in, H 3. H 4. H The unit for 5 is mm; 20) Angle between the inner ring of the wind ring and the horizontal direction θ 1: 21) Angle between the guide cone and the horizontal direction θ 3: 22) Angle between the lifting platform and the horizontal direction θ 4: 23) Angle between the coarse material guide cone and the horizontal direction θ 5: 24) Angle between the coarse particle sorting shell and the horizontal direction θ 6: 25) Angle between the medium and coarse powder guide cone and the horizontal direction θ 7: 26) The angle between the lower edge of the medium-coarse powder overflow hole and the upper edge of the medium-coarse powder return cone is the same as the horizontal direction. θ 9: in, θ 1. θ 3. θ 4. θ 5. θ 6. θ 7. θ The unit for 9 is °; 27) The diameters of the lower end of the dispersing plate of the annular "stepped" dispersing device, from top to bottom, are respectively: D 9. D 10 , D 11 , D 12 : 28) The gaps between two adjacent dispersing plates of the annular "stepped" dispersing device, from top to bottom, are respectively d 4. d 5. d 6: in, d 4. d 5. d The unit for 6 is mm; m / s, The blowing speed of the ring-shaped "stepped" dispersing device; 29) The diameters of the lower end of the dispersing plate of the annular "Z"-shaped dispersing device, from top to bottom, are respectively: D 13 , D 14 , D 15 , D 16 : in, D 9. D 10 , D 11 , D 12 , D 13 , D 14 , D 15 , D 16 The units are all mm; 30) The gaps between two adjacent dispersing plates of the annular "Z"-shaped dispersing device, from top to bottom, are respectively d 7. d 8. d 9: in, d 7. d 8. d All units for 9 are mm; The blowing speed of the annular "Z"-shaped dispersing device is... m / s; 31) The overlap distance of the generatrix projections of two adjacent dispersing plates in the annular "stepped" dispersing device, from top to bottom, is as follows: S 3. S 4. S 5: like S 3. S 4. S If the requirements are not met, make appropriate adjustments. D 9. D 10 , D 11 Calculated value; 32) The distances from the projection point of the end of the upper dispersing plate onto the lower dispersing plate of the annular "Z"-shaped dispersing device to the end of the dispersing plate, from top to bottom, are respectively: S 7. S 8. S 9: like S 7. S 8. S If 9 does not meet the requirements, then make appropriate adjustments. D 14 , D 15 , D 16 Calculated value; in, S 3. S 4. S 5. S 7. S 8. S All units for 9 are mm; 33) The angle between each dispersing plate of the annular "stepped" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction θ 8: in, θ The unit for 8 is °.

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