Coarse and fine separation mechanism of a grading classifier and application thereof

Abstract

The application discloses a coarse-fine separation mechanism of a grading powder separator and application thereof, and the coarse-fine separation mechanism comprises, from bottom to top, a wind distribution and material distribution area and a pre-scattering and coarse particle grading area which are connected with each other; the wind distribution and material distribution area comprises an air inlet shell, an air inlet, a coarse particle outlet, a flow guide cone and a ring-shaped air ring; the pre-scattering and coarse particle grading area comprises a coarse particle separation shell, a coarse particle separation rotating cage, a material distribution device and a coarse particle separation drive; a material lifting platform is arranged between the coarse particle separation shell and the air inlet shell, and the material lifting platform is located at the outside of the material distribution area outlet and is adjacent to the ring-shaped air ring at the lower side; the coarse particle separation drive is connected with the coarse particle separation rotating cage and the material distribution cone platform through a shaft system, and is used for driving the coarse particle separation rotating cage and the material distribution cone platform to rotate. The application is a kind of mechanism with the functions of scattering, material distribution and coarse-fine particle separation, can be well matched with a traditional dynamic powder separator, complete more clear particle separation, and solve a series of problems caused by the common problems of V selection.

Description

A coarse and fine separation mechanism for a classifying powder separator and its application Technical Field

[0001] This invention relates to the field of powder selection technology, and in particular to a coarse and fine separation mechanism of a grading powder classifier and its application. 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 coarse and fine particle separation mechanism for a classifying air classifier and its application. This mechanism has functions of dispersing, distributing, and separating coarse and fine particles. From bottom to top, it consists of an air and material distribution zone and a pre-dispersing and coarse particle classification zone. It can work well with traditional dynamic air classifiers to achieve clearer particle separation, solving a series of problems caused by the common issues of V-separation. Coarse particles (d > 0.2 mm) are returned to the material bed extrusion equipment, medium and coarse particles (0.045 mm < d < 0.2 mm) are returned to the fine grinding equipment, and fine particles (d < 0.045 mm) are selected as finished products. This better adapts to traditional combined / semi-finish grinding systems and meets the requirements for materials with different fineness.

[0005] The present invention is implemented as follows: a coarse and fine separation mechanism of a classifying powder separator, which includes, from bottom to top, a connected air and material distribution area and a pre-dispersing and coarse particle classification area.

[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 above 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, a cage cone arranged coaxially inside the coarse particle classification blades, and dispersing round steel located on the upper inner side of the cage cone. The coarse particle sorting rotating cage is provided with an upper ring plate at the top, a middle ring plate in the middle, and a lower ring plate at the bottom. The coarse particle classification blades are located... The upper, middle, and lower ring plates are evenly radially distributed near their outer edges; a support cover plate is provided above the coarse 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 by a dynamic seal, forming the outer seal of the coarse particle sorting drum; the support cover plate, the coarse particle sorting shell, and the coarse particle grading blades together constitute the coarse particle grading zone;

[0008] The top of the cage cone is connected to a feeding pipe, and the feeding pipe and the cage cone are connected by a dynamic seal to form an internal seal of the coarse particle sorting rotating cage; the material distribution device is coaxially arranged below the cage cone, and the material distribution device and the cage cone form an upper material dispersion area and a lower material distribution area; a lifting platform is provided between the coarse particle sorting shell and the air inlet shell, and the lifting platform is located on the outside of the material distribution area outlet and adjacent to the annular air ring on its lower side; the top surface of the support cover plate is connected to the outlet air duct of the coarse particle sorting rotating cage;

[0009] The coarse particle sorting drive is connected to the coarse particle sorting drum and the fabric disc cone via a shaft system, and is used to drive the coarse particle sorting drum and the fabric disc cone to rotate.

[0010] Preferably, the bottom surface of the support cover plate is fixedly connected to an outer sealing ring located on the outer side of the upper ring plate and an inner sealing ring located on the inner side of the upper ring plate. The outer sealing ring and the inner sealing ring cooperate with the upper ring plate to form a rotating cage outer seal. The rotating cage outer seal is a dynamic seal, and the dynamic sealing gap of the rotating cage outer seal is 10-20mm.

[0011] A rotating cage inner sealing ring is provided around the outer edge of the cage cone near the feeding pipe. The rotating cage inner sealing ring and the feeding pipe cooperate to form the rotating cage inner seal of the coarse particle sorting rotating cage. The rotating cage inner seal is a dynamic seal. The dynamic sealing gap of the rotating cage inner seal is 10-20mm. The radial positions of the rotating cage inner sealing ring and the feeding pipe are interchangeable.

[0012] Preferably, the coarse particle sorting drum and the feeding device are driven by the same drive. In this case, the shaft system includes a main shaft and a main shaft sleeve sleeved on the main shaft. A hub is provided on the top of the main shaft. The upper part of the hub is connected to the dispersing round steel, and the lower part of the hub is connected to the feeding device. An anti-wear cap is provided on the top of the hub.

[0013] Preferably, the coarse particle sorting drum and the feeding device are driven independently by two drives. In this case, the coarse particle sorting drive includes an independent drive one and an independent drive two. The shaft system one includes an inner drive shaft and an outer drive sleeve shaft. The upper end of the inner drive shaft is connected to the dispersing round steel through a hub, and the lower end is connected to the independent drive one. The outer drive sleeve shaft is sleeved on the inner drive shaft. The upper end of the outer drive sleeve shaft is connected to the feeding device, and the lower end is connected to the independent drive two through a pulley set.

[0014] Preferably, the material distribution device comprises a material distribution disc cone and a material distribution disc base plate. The material distribution disc cone is located below the cage cone, and the outer edge of the bottom end of the material distribution disc cone is connected to the material distribution disc base plate. A material flow distribution channel is formed between the material distribution disc base plate and the lower ring plate. The gap H2 between the material distribution disc base plate and the lower ring plate is 250-350mm, the gap H3 between the material distribution disc base plate and the annular air ring outlet is 50-150mm, and the outer diameter D of the material distribution disc base plate is... 2. The diameter D1 of the coarse particle sorting drum is 0-50 mm smaller than that of the drum. The height H5 of the lifting platform is 1.1-1.3 times the gap between the lower ring plate and the outlet of the annular air ring. The angle θ4 between the lifting platform and the horizontal direction is 45-55°. When the coarse particle sorting drum and the material distribution device are driven by the same drive, the material distribution channel is evenly distributed with round steel bars. The top end of the round steel bars is connected to the lower ring plate, and the bottom end is connected to the bottom plate of the material distribution plate.

[0015] The outer edge of the bottom plate of the fabric tray is fixedly connected to the dynamic sealing outer ring of the fabric device, and the inner ring of the annular air ring is provided with the dynamic sealing inner ring of the fabric device. The dynamic sealing outer ring and the dynamic sealing inner ring of the fabric device constitute the dynamic seal of the fabric device, and the dynamic sealing gap of the dynamic seal of the fabric device is 10-20mm.

[0016] Preferably, the feeding pipe is located directly above the center of the coarse particle sorting drum, the feeding pipe is connected to the inside of the drum cone, and the feeding pipe and the outlet air duct of the coarse particle sorting drum form a dust-laden airflow rising channel.

[0017] The diameter of the feed tube is D4 (mm):

[0018]

[0019] Where P is the system design output (t / h), the system circulating 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;

[0020] The diameter D1 (mm) of the coarse particle sorting drum is:

[0021]

[0022] The diameter-to-height ratio (D / H) of the coarse particle separator is 1.8–2.0, and the radial velocity (V2) of the coarse particle separator is 1.5–2.5 m / s; Q is the system's air volume for powder separation (m³ / s). 3 / h);

[0023]

[0024] Where P is the system design output (t / h), the system circulating load k = 3 ± 1, and the powder concentration C s =800±200g / m 3 Feed concentration F s =2.5±0.5kg / m 3 .

[0025] The diameter D3 (mm) of the outlet duct of the coarse particle sorting rotary drum is:

[0026]

[0027] Among them, the outlet wind speed V1 of the coarse particle sorting drum is 10-15 m / s;

[0028] The angle θ6 between the coarse particle sorting shell and the horizontal direction is 65-75°, and the upper diameter D5 of the inner cavity of the coarse particle sorting shell is 300-500 mm larger than the diameter D1 of the coarse particle sorting drum.

[0029] Preferably, the upper ring plate is connected to the cage cone via a rotating cage tie rod, and 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; and the inner edge of the middle ring plate is connected to the cage cone via a tie rod or a stiffening plate.

[0030] 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.

[0031] 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;

[0032] 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.

[0033] 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 θ7 between the dispersing plates of the annular "stepped" dispersing device and the annular "Z"-shaped dispersing device and the horizontal direction is 40-50°.

[0034] Preferably, the annular wind ring includes an inner wind ring, an outer wind ring, and several wind ring guide vanes inclinedly disposed between the inner and outer wind rings; the top diameter D6 of the inner wind ring is 40-60 mm smaller than the outer diameter D2 of the fabric tray bottom plate, and the angle θ1 between the inner wind ring and the horizontal direction is 50-70°.

[0035] The outer diameter of the air ring or the inner diameter of the air inlet housing, D7 (mm):

[0036]

[0037] Where V3 is the outlet velocity of the annular air ring (m / s), D6 is the top diameter of the inner ring of the air ring (mm), and Q is the system's powder separation air volume (m³ / s). 3 / h);

[0038] Number of wind guide vanes n (units):

[0039]

[0040] Where n is rounded to the nearest integer;

[0041] Annular wind ring height H4 (mm):

[0042]

[0043] Where θ2 is the angle (°) between the wind ring guide blade and the horizontal direction, 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, and t is the thickness of the wind ring guide blade.

[0044] The outlet wind speed V3 of the annular wind ring is 8-12 m / s, the gap wind speed V4 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 35-45°, the thickness t of the wind ring guide vanes is 10-20 mm, the gap d1 between two adjacent wind ring guide vanes is 100-200 mm, and the ratio S1:S2 of the horizontal projection overlap length S1 of two adjacent wind ring guide vanes to the horizontal projection length S2 of a single wind ring guide vane is 0.3-0.8.

[0045] Preferably, the bottom end of the guide cone is connected to a coarse material guide cone, the angle θ3 between the guide cone and the horizontal direction is 50-70°, and the angle θ5 between the coarse material guide cone and the horizontal direction is 55-65°.

[0046] Guide cone - Coarse material guide cone interface diameter D8 (mm):

[0047]

[0048] Among them, V5 is the air inlet boosting speed, which is 3 to 5 m / s.

[0049] The advantages and positive effects of this invention are:

[0050] This invention features a coarse particle sorting drum with an independently driven forced vortex field that completely shields coarse particles. This ensures that when the coarse and fine particle sorting mechanism is used in conjunction with a traditional dynamic classifier, coarse particles do not enter the subsequent fine powder classification process, achieving gradient classification of coarse, medium, and fine particles to meet the grinding requirements of different equipment in combined / semi-finished grinding systems. The coarse particle sorting drum also incorporates internal dispersing round steel bars that break up the material cake formed by the material bed extrusion equipment, thus reducing the significant height difference required for static dispersal, lowering the building height, and saving on construction costs. A material distribution device below the coarse particle sorting drum evenly distributes the broken material cake onto the annular air ring, facilitating the settling of coarse particles and the lifting of medium and fine powders. The inclusion of a guide cone and 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 sorting zone, lower circulating load and material concentration, reduced equipment resistance, and lower power consumption of the circulating fan. This coarse and fine separation mechanism has a compact structure and solves the problem of uneven airflow and material flow in traditional V-type air classifiers. When used in conjunction with traditional dynamic air classifiers, it can achieve precise classification of coarse particles, medium-coarse powder, and fine powder. Its performance is completely superior to the traditional V-type air classifier and fine dynamic air classifier in series, and it can replace them. Attached Figure Description

[0051] 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.

[0052] Figure 1 is a schematic diagram of the coarse and fine sorting mechanism of the present invention;

[0053] Figure 2 is the AA view in Figure 1;

[0054] Figure 3 is the BB view in Figure 1;

[0055] Figure 4 is a schematic diagram of the structure of the coarse particle sorting drum and the cloth feeding device of the present invention being driven independently.

[0056] Figure 5 is a partial detail view of part A in Figure 4 of the present invention;

[0057] Figure 6 is a partial detail view of part B in Figure 4 of the present invention;

[0058] Figure 7 is a partial detail view of part C in Figure 4 of the present invention;

[0059] Figure 8 is a schematic diagram of the coarse and fine separation mechanism of the present invention, which introduces dust-laden airflow in the form of wind sweeping.

[0060] Figure 9 is a schematic diagram of the structure of the annular "stepped" shaped dispersing device of the present invention;

[0061] Figure 10 is a schematic diagram of the annular "Z"-shaped dispersing device of the present invention;

[0062] Figure 11 is a schematic diagram of the coarse and fine separation mechanism of the present invention in conjunction with a traditional dynamic air classifier;

[0063] Figure 12 is a schematic diagram of the process structure parameters of the coarse and fine separation mechanism of the present invention;

[0064] Figure 13 is a schematic diagram of the process structure parameters of the annular "stepped" shaped dispersing device of the present invention;

[0065] Figure 14 is a schematic diagram of the process structure parameters of the annular "Z"-shaped dispersing device of the present invention.

[0066] The components include: 1. Air inlet; 2. Outer ring of the air ring; 3. Air ring guide vanes; 4. Inner ring of the air ring; 5. Coarse particle sorting drum; 6. Feeding device; 7. Coarse particle sorting shell; 8. Feeding pipe; 9. Outlet air duct of the particle sorting drum; 10. Air distribution and feeding area and pre-dispersing and coarse particle grading area; 11. Upper bearing seat; 12. Drum pull rod; 13. Dispersing round steel; 14. Hub; 15. Anti-wear cap; 16. Inner seal of the drum; 16-1. Inner sealing ring of the drum; 17. Upper ring plate; 18. Outer seal of the drum; 18-1. Outer sealing ring; 18-2. Inner sealing ring; 19. Support cover plate; 20. Middle ring plate; 21. Coarse particle grading vanes; 22. Lower ring plate; 23. Feeding round steel; 24. Bottom plate of the feeding tray; 25. Annular air ring; 26. Support platform of the upper bearing seat; 7. Air inlet housing; 28. Coarse particle outlet; 29. ​​Drive unit base; 30. Material distribution disc cone; 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. Foundation support; 40. Support flange; 41. Main shaft; 42. Coarse particle sorting drive; 43. Inner drive shaft; 44. Outer drive sleeve shaft; 45. Pulley assembly; 46. Independent drive one; 47. Independent drive two; 48. Grading equipment or grinding equipment; 49. Support device; 50. Connecting stiffener; 51. Annular "stepped" shaped dispersing device; 52. Dispersing plate; 53. Annular "Z" shaped dispersing device; 54. Material distribution device dynamic seal outer ring; 55. Material distribution device dynamic seal inner ring. Detailed Implementation

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Example

[0071] Please refer to Figures 1 to 11. An embodiment of the present invention provides a coarse and fine separation mechanism for a grading and classifying powder machine, which includes, from bottom to top, a connected air and material distribution area and a pre-dispersing and coarse particle grading area.

[0072] The air distribution and fabric spreading area is located at the bottom and includes an air inlet housing 27, an air inlet 1, 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 sits on the foundation support 39 and is connected to the foundation by outer support ribs. The air inlet 1 is located on the side of the air inlet housing 27, and the air intake of the air inlet 1 is either tangential or vertical. The coarse particle outlet 28 is located at the bottom of the air inlet housing 27 and is provided with... There are multiple guide cones 36 and 37, which are arranged in a ring-shaped 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. The annular air ring 25 is installed between the upper outer edge of the guide cone 36 and the upper 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 is close to the inner wall of the air inlet housing 27. The upper inner edge of the annular air ring 25 is connected to the bearing seat support platform 26. The annular air ring 25 includes an inner ring 4, an outer ring 2, and several air ring guide vanes 3 that are inclined between the inner ring 4 and the outer ring 2. The top diameter D6 of the inner ring 4 of the wind ring is 40-60 mm smaller than the outer diameter D2 of the bottom plate 24 of the fabric tray. The angle θ1 between the inner ring 4 and the horizontal direction is 50-70°. The outlet wind speed V3 of the annular wind ring is 8-12 m / s. The gap wind speed V4 of the wind ring guide vane 3 is 18±2 m / s. The angle θ2 between the wind ring guide vane 3 and the horizontal direction is 35-45°. The thickness t of the wind ring guide vane is 10-20 mm. The gap d1 between two adjacent wind ring guide vanes is 100-200 mm. The ratio S1:S2 of the horizontal projection overlap length of two adjacent wind ring guide vanes 3 to the horizontal projection length of a single wind ring guide vane 3 is 0.3-0.8.

[0073] Above the annular air ring 25 is a pre-dispersing and coarse particle classification zone, which includes a coarse particle sorting shell 7, a coarse particle sorting rotating cage 5, a feeding device 6, and a coarse particle sorting drive 42. The coarse particle sorting rotating cage 5 is located inside the coarse particle sorting shell 7. The coarse particle sorting rotating cage 5 includes coarse particle classification blades 21 located around the perimeter, a cage cone 31 coaxially arranged inside the coarse particle classification blades 21, and dispersing round steel 13 located on the upper inner side of the cage cone 31. The dispersing round steel 13 is radially evenly distributed and its outer surface is treated with wear resistance. The top of the coarse particle sorting rotating cage 5 is provided with an upper ring plate 17, the middle is provided with a middle ring plate 20, and the bottom is provided with a lower ring plate 22. The coarse particle classification blades 21 are located between the upper ring plate 17, the middle ring plate 20, and the lower ring plate 22, and are close to the outer edges of the upper ring plate 17, the middle ring plate 20, and the lower ring plate 22 and are evenly radially distributed. A support cover plate 19 is provided above the coarse particle sorting shell 7 and the coarse particle grading 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 outer seal 18 of the coarse particle sorting drum. The support cover plate 19, the coarse particle sorting shell 7, and the coarse particle grading blades 21 together constitute the coarse particle grading zone.

[0074] The top of the cage cone 31 is connected to the feeding pipe 8, and the feeding pipe 8 and the cage cone 31 are connected by a dynamic seal to form the inner seal 16 of the coarse particle sorting rotating cage.

[0075] The material distribution device 6 is coaxially arranged below the cage cone 31, and the material distribution device 6 and the cage cone 31 form an upper material dispersing area and a lower material distribution area.

[0076] The feeding device 6 consists of a feeding disc cone 30 and a feeding disc base plate 24. The feeding disc cone 30 is coaxially arranged below the cage cone 31. The outer edge of the bottom of the feeding disc cone 30 is connected to the feeding disc base plate 24. A material flow feeding channel is formed between the feeding disc base plate 24 and the lower ring plate 22. The gap H2 between the feeding disc base plate and the lower ring plate is 250-350mm, and the gap H3 between the feeding disc base plate and the annular air ring outlet is 50-150mm. The outer diameter D2 of the feeding disc base plate is 0-50mm smaller than the diameter D1 of the coarse particle sorting drum. Feeding round steel bars 23 are evenly distributed around the circumference of the material flow feeding channel. The top end of the feeding round steel bars 23 is connected to the lower ring plate 22, and the bottom end is connected to the feeding disc base plate 24. While feeding the material, the feeding round steel bars 23 also connect the feeding disc base plate 24 and the lower ring plate 22 into a whole. If the coarse particle sorting drum 5 and the feeding device 6 are driven independently, the feeding round steel 23 can be eliminated.

[0077] As shown in Figure 6, a dynamic sealing outer ring 54 of the material distribution device is fixedly connected to the lower outer edge of the bottom plate 24 of the material distribution tray, and a dynamic sealing inner ring 55 of the material distribution device is provided on the inner ring 4 of the annular air ring 25. Together, they constitute the dynamic seal of the material distribution device. The dynamic sealing gap of the material distribution device dynamic seal is 10-20mm to prevent the material to be sorted from being discharged from the system through the inner ring 4 of the air ring and the guide cone 36. Specifically, the dynamic sealing inner ring 55 of the material distribution device is fixedly connected to the upper edge of the inner ring 4 of the air ring and close to the outer edge of the upper bearing seat support platform 26, and the dynamic sealing outer ring 54 of the material distribution device is fixedly connected to the lower side of the outer edge of the bottom plate 24 of the material distribution tray.

[0078] A lifting platform 34 is provided between the coarse particle sorting shell 7 and the air inlet shell 27. The height H5 of the lifting platform is 1.1 to 1.3 times the gap between the lower ring plate 22 and the outlet of the annular air ring. The angle θ4 between the lifting platform and the horizontal direction is 45 to 55°. The lifting platform 34 is located on the outside of the material flow distribution channel and its lower side is adjacent to the annular air ring 25. The top surface of the support cover plate is connected to the outlet air duct 9 of the coarse particle sorting drum.

[0079] The coarse particle sorting drive 42 is connected to the coarse particle sorting drum 5 and the material distribution cone 30 via a shaft system, and is used to drive the coarse particle sorting drum 5 and the material distribution cone 30 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 a coarse material guide cone 38. The angle θ3 between the guide cone and the horizontal direction is 50-70°, and the angle θ5 between the coarse material guide cone and the horizontal direction is 55-65°. The guide cone 36 and the coarse material guide cone 38 together isolate the material flow and airflow outside the shaft system.

[0080] Specifically, the feeding pipe 8 is located directly above the center of the coarse particle sorting drum 5. The feeding pipe 8 is connected to the inside of the drum cone 31. The material to be sorted is fed into the drum cone 31 through the feeding pipe 8 for pre-dispersion and the fed material flow is separated from the outside airflow. The feeding pipe 8 and the outlet air duct 9 of the coarse particle sorting drum form a dust-laden airflow rising channel. As shown in Figure 7, a rotating cage inner seal 16 is provided around the outer edge of the cage cone 31 near the feeding pipe 8. It consists of a rotating cage inner seal ring 16-1 and the feeding pipe 8. The rotating cage inner seal ring 16-1 and the feeding pipe 8 cooperate to form the rotating cage inner seal 16 of the coarse particle sorting rotating cage. The dynamic sealing gap of the rotating cage inner seal 16 is 10-20mm to prevent the sorted medium and coarse powder and the material to be sorted from entering each other in the opposite direction. The radial positions of the rotating cage inner seal ring 16-1 and the feeding pipe 8 are interchangeable.

[0081] As shown in Figure 5, a rotating cage outer seal 18 is provided around the bottom surface of the support cover plate 19 near the inner and outer edges of the upper ring plate 17. This seal consists of an outer sealing ring 18-1, an inner sealing ring 18-2, and the upper ring plate 17. The outer sealing ring 18-1 is fixed to the bottom surface of the support cover plate 19 and located at the outer edge of the upper ring plate 17. The inner sealing ring 18-2 is also fixed to the bottom surface of the support cover plate 19 and located at the inner edge of the upper ring plate 17. The outer sealing ring 18-1 and the inner sealing ring 18-2, together with the upper ring plate 17, form the rotating cage outer seal 18. The dynamic sealing gap of the rotating cage outer seal 18 is 10-20 mm to prevent coarse particles from directly passing through the coarse particle sorting rotating cage 5 without being sorted and entering the subsequent sorting process. Both the inner seal 16 and the outer seal 18 are dynamic seals, ensuring that interference and collision do not occur when the coarse particle sorting rotating cage 5 rotates.

[0082] As shown in Figure 1, 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 5 and is evenly distributed along the axis of the coarse particle sorting rotating cage 5. 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 5, 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.

[0083] As shown in Figure 1, the coarse particle sorting drum 5 and the feeding disc cone 30 are driven by the same drive. At this time, 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. The upper part of the hub 14 is connected to the dispersing round steel 13, and the lower part of the hub 14 is connected to the feeding disc cone 30. An anti-wear cap 15 is provided on the top of the hub 14. 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 5 and the feeding disc cone 30.

[0084] To further achieve precise sorting of coarse particles and optimal fabric rotation speed, the coarse particle sorting drum 5 and the fabric disc cone 30 can be driven independently. Specifically, as shown in Figure 4, the coarse particle sorting drum 5 and the fabric disc cone 30 are driven independently by two separate drives. The coarse particle sorting drive includes independent drive one 46 and independent drive two 47. The shaft system one includes an inner drive shaft 43 and an outer drive sleeve shaft 44. The upper end of the inner drive shaft 43 is connected to the dispersing round steel 13 through a hub 14, and the lower end is connected to independent drive one 46, which can be frequency-controlled. The outer drive sleeve shaft 44 is sleeved on the inner drive shaft 43. The upper end of the outer drive sleeve shaft 44 is connected to the fabric disc cone 30, and the lower end is connected to independent drive two 47 through a pulley group 45, which can be frequency-controlled. Specifically, the inner drive shaft 43 is supported by its matching upper and lower bearings or upper, middle and lower bearing assemblies. The upper bearing assembly can be located on the upper part of the bearing seat 11 of the feeding disc cone 30, or inside the bearing seat 11 of the feeding disc cone 30. The outer drive sleeve shaft 44 is supported by its matching upper and lower bearings or upper, middle and lower bearing assemblies. The upper bearing assembly is located inside the bearing seat 11 of the feeding disc cone 30. The coarse particle sorting drum 5 and the feeding disc cone 30 can achieve independent speed adjustment according to the different speed requirements of feeding and sorting. At this time, the entire equipment is a three-drive type.

[0085] As shown in Figure 8, in order to further achieve more levels of sorting or ultra-fine sorting, a dust-laden airflow can be introduced in series with a grading device or a grinding device 48 in a wind-swept manner. Specifically, the air inlet 1 is connected to a grading device (such as a static classifier) ​​or a grinding device (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.

[0086] To further improve the clarity of particle classification, specifically, an annular "stepped" shaped dispersing device 51 (see Figure 9) or an annular "Z" shaped dispersing device 53 (see Figure 10) is provided below the annular air ring 25 and inside the air inlet housing 27. The dispersing plates 52 of the annular "stepped" shaped dispersing device 51 are all supported on the inner wall of the air inlet housing 27 by support devices 49, arranged in a stepped structure with a certain spacing. Adjacent dispersing plates 52 are connected by connecting ribs 50. Part of the dispersing plates 52 of the annular "Z" shaped dispersing device 53 are supported on the inner wall of the air inlet housing 27 by support devices 49, and part are supported on the outer wall of the guide cone 36 by support devices 49. The dispersing plates 52 on both sides are arranged in a stepped structure with a certain spacing, forming a dispersing and classification channel between adjacent dispersing plates 52 on both sides, 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 51 or the annular "Z" shaped dispersing device 53. After being impacted by their respective dispersing plates 52, the material is dispersed and then blown by the rising airflow between the dispersing plates 52. Small particles pass upward through the annular air ring 25 and enter the coarse particle sorting zone 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.

[0087] The grading process of the coarse and fine separation mechanism of the grading classifier is as follows:

[0088] The material to be sorted is fed into the pre-dispersing and coarse particle classification zone through the feeding pipe 8. Under the action of the anti-wear cap 15, it is dispersed onto the dispersing round steel 13 inside the coarse particle sorting drum 5. The dispersing round steel 13 fully disperses the material cake contained in the material. After being fully dispersed by the dispersing round steel 13, the material is distributed and evenly thrown onto the lifting platform 34 by the lower rotating distribution disc cone 30 and the distribution disc bottom plate 24. Then, under the action of gravity, it falls downward with a certain kinetic energy to the annular air ring 25 in the air distribution zone. Under the action of falling kinetic energy and inertia, it impacts the air ring guide vanes and is further fully dispersed by the air ring guide vanes 3 of the annular air ring 25 and the annular "stepped" dispersing device 51 or annular "Z" shaped dispersing device 53 below the annular air ring 25. This further disperses the fine particles (medium and coarse powder and fine powder) mixed between the "clumps" of material flow and the fine powder adhering to the surface of the coarse particles. The material is fully dispersed and separated; 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. The dispersed material is concentrated and blown at high speed to complete the first coarse particle classification. Most of the coarse particles return to the material bed extrusion equipment for further grinding under the action of gravity through the coarse particle outlet 28. A small portion of coarse particles, most of the medium and coarse powder and fine powder pass upward with the sorting airflow through the annular air ring 25 and enter the coarse particle sorting drum 5 to complete the second coarse and fine particle classification. The rotation of the coarse particle sorting drum 5 forms a forced vortex field, so it can more accurately control the coarse particles from passing through the coarse particle classification blades 21 to enter the subsequent classification process. The dust-laden airflow after sorting (passing through the coarse particle classification blades 21) is discharged along the dust-laden airflow rising channel or enters the subsequent fine dynamic classifier.

[0089] The process structure parameters of the present invention are shown in Figures 12 to 14. To facilitate the explanation of the design method of the present invention, the following main process structure parameters are set:

[0090] 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 5 diameter D1 (mm), coarse particle sorting drum 5 height H1 (mm), coarse particle sorting drum 5 diameter-to-height ratio D / H, material distribution plate bottom plate 24 outer diameter D2 (mm), coarse particle sorting drum outlet duct 9 diameter D3 (mm), feed pipe 8 diameter D4 (mm), coarse particle sorting shell 7 inner cavity upper diameter D5 (mm), air ring inner ring 4 diameter D6 (mm), air ring outer ring 2 diameter or air inlet shell 27 inner diameter D7 (mm), guide cone 36 - coarse material guide cone interface straight Diameter D8 (mm), gap H2 (mm) between lower ring plate 22 and bottom plate 24 of distribution disc, gap H3 (mm) between bottom plate 24 of distribution disc and outlet of annular air ring 25, height H4 (mm) of annular air ring 25, height H5 (mm) of lifting platform 34, angle θ1 (°) between inner ring 4 and horizontal direction, number n (pieces) of air ring guide vanes 3, thickness t (mm) of air ring guide vanes 3, angle θ2 (°) between air ring guide vanes 3 and horizontal direction, angle θ3 (°) between guide cone 36 and horizontal direction, lifting platform 34 Angle θ4 (°) with the horizontal direction, angle θ5 (°) with the horizontal direction of the coarse material guide cone 38, angle θ6 (°) with the horizontal direction of the coarse particle sorting shell 7, outlet wind speed V1 (m / s) of the coarse particle sorting drum 5, radial wind speed V2 (m / s) of the coarse particle sorting drum 5, outlet wind speed V3 (m / s) of the annular wind ring 25, gap wind speed (effective wind speed of the annular wind ring 25) V4 (m / s) of the wind ring guide vanes 3, lifting wind speed V5 (m / s) of the air inlet 1, and blowing wind speed of the annular "stepped" shaped dispersing device. V6 (m / s), blowing speed of the annular "Z"-shaped dispersing device V7 (m / s), gap d1 (mm) between two adjacent air ring guide vanes 3, horizontal projection length S2 (mm) of the air ring guide vane 3, horizontal projection overlap length S1 (mm) of two adjacent air ring guide vanes 3, gap (from top to bottom) between two adjacent dispersing plates of the annular "stepped" dispersing device d4 (mm), d5 (mm), d6 (mm), diameter of the lower end of the dispersing plate of the annular "stepped" dispersing device (from top to bottom) D9 (mm), D 10 (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 θ7 (°) between each dispersing plate of the annular "step" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction.

[0091] The calculation steps for the above main process parameters are as follows:

[0092] 1) System powder selection air volume Q (m³) 3 / h):

[0093] 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):

[0094]

[0095] Where, k = 3 ± 1, C s =800±200g / m 3 F s =2.5±0.5kg / m 3 .

[0096] 2) Coarse particle sorting rotary drum 5, diameter D1 (mm):

[0097]

[0098] 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).

[0099] 3) Height H1 (mm) of coarse particle sorting drum 5:

[0100]

[0101] 4) Fabric tray base plate 24 outer diameter D2 (mm):

[0102] D2 = D1 - (0 ~ 50) (4)

[0103] 5) Inner ring diameter D6 (mm):

[0104] D6 = D2 - (40~60) (5)

[0105] 6) Outer diameter of the air ring 2 or inner diameter of the air inlet casing 27 D7 (mm):

[0106]

[0107] Among them, the outlet wind speed of the annular wind ring 25 is V3 = 10 ± 2 m / s.

[0108] 7) Flow guide cone 36 - Coarse material guide cone 38 interface diameter D8 (mm):

[0109]

[0110] Among them, the air inlet 1 increases the wind speed V5 = 4 ± 1 m / s.

[0111] 8) Diameter D5 (mm) at the upper end of the inner cavity of the coarse particle sorting shell 7:

[0112] D5=D1+(400±100)mm (8)

[0113] 9) Feed pipe 8 diameter D4 (mm):

[0114]

[0115] 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.

[0116] 10) Diameter D3 (mm) of the outlet duct of the coarse particle sorting rotary drum:

[0117]

[0118] Among them, the outlet wind speed of the coarse particle sorting drum is V1 = 10~15 (m / s).

[0119] 11) The gap H2 (mm) between the lower ring plate 22 and the bottom plate 24 of the fabric tray:

[0120] H2=300±50(mm) (11)

[0121] 12) The gap H3 (mm) between the bottom plate 24 of the fabric tray and the outlet of the annular air ring 25:

[0122] H3=100±50(mm) (12)

[0123] 13) Number n (blades) of the wind ring guide vanes:

[0124]

[0125] Among them, the gap d1 between two adjacent wind ring guide blades is 150±50 (mm), the gap wind speed V4 between the wind ring guide blades is 18±2 (m / s), and n is rounded to the nearest integer.

[0126] 14) Height H4 (mm) of the annular air ring 25:

[0127]

[0128] Among them, the angle θ2 between the wind ring guide blade 3 and the horizontal direction is 40±5 (°), the ratio of the horizontal projection overlap length S1 of two adjacent wind ring guide blades 3 to the horizontal projection length S2 of a single wind ring guide blade 3 is S1 / S2 = 0.3~0.8, and the thickness t of the wind ring guide blade 3 is 10~20 mm.

[0129] 15) Height H5 (mm) of the lifting platform 34:

[0130] H5=(1.2±0.1)(H2+H3) (15)

[0131] 16) The angle θ1 (°) between the four inner rings of the wind ring and the horizontal direction:

[0132] θ1=60±10 (16)

[0133] 17) The angle θ3 (°) between the guide cone 36 and the horizontal direction:

[0134] θ3=60±10 (17)

[0135] Preferably, θ3 = θ1;

[0136] 18) The angle θ4 (°) between the lifting platform 34 and the horizontal direction:

[0137] θ4=50±5 (18)

[0138] 19) The angle between the coarse material guide cone 38 and the horizontal direction is θ5 (°):

[0139] θ5=60±5 (19)

[0140] 20) The coarse particle sorting shell 7 has an angle θ6 (°) with the horizontal direction:

[0141] θ6=70±5 (20)

[0142] 21) The diameter of the lower end of the dispersing plate of the annular "stepped" dispersing device 51, from top to bottom, is D9 (mm), D...10 (mm), D 11 (mm), D 12 (mm):

[0143]

[0144] D 12 =D8+(500~600) (22)

[0145]

[0146]

[0147] 22) 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:

[0148]

[0149] Among them, the blowing speed of the annular "stepped" shaped dispersing device is V6 = 14 ± 2 (m / s);

[0150] 23) The diameter of the lower end of the dispersing plate of the annular "Z"-shaped dispersing device 72, from top to bottom, is D 13 (mm), D 14 (mm), D 15 (mm), D 16 (mm):

[0151]

[0152]

[0153] 24) 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:

[0154]

[0155]

[0156]

[0157] Among them, the blowing speed of the annular "Z"-shaped dispersing device is V7 = 14 ± 2 (m / s);

[0158] 25) The overlap distances of the generatrix projections of two adjacent dispersing plates in the annular "stepped" dispersing device, from top to bottom, are S3 (mm), S4 (mm), and S5 (mm):

[0159] S3=S4=S5=150±50 (31)

[0160] If S3, S4, and S5 cannot meet the requirements of equation (31), then D9 and D can be adjusted appropriately. 10 D 11 Calculated value;

[0161] 26) 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, respectively:

[0162] S7=S8=S9=150±50 (32)

[0163] If S7, S8, and S9 cannot meet the requirements of (32), then D can be adjusted appropriately. 14 D 15 D 16 Calculated value;

[0164] 27) The angle θ7 (°) between the dispersing plates of the annular "stepped" shaped dispersing device and the annular "Z" shaped dispersing device and the horizontal direction:

[0165] θ7=45±5 (33).

[0166] To verify the technical effect of the present invention, a semi-industrial combined grinding test system based on TRP ф400x100mm-ф750x2500mm was used. The coarse and fine separation mechanism of the present invention was combined with a traditional dynamic air classifier, and the system's air volume for air separation was designed to be 4000m³ / h. 3 / h, a grading and classifying mill with specifications Cф300*550-Fф300-570mm was compared with the original V-type mill in the same system under basically the same working conditions. 40 sets of comparative tests were conducted on grinding PO425 cement. The test statistical data results are shown in Table 1.

[0167] Table 1 Comparison of the air classifier of the present invention with the traditional V-classifier.

[0168]

[0169] As shown in Table 1, in terms of powder selection efficiency, compared with traditional V-separation technology, under essentially the same operating conditions, the powder selection efficiency of this invention significantly decreases for particles >0.2mm, with a cumulative decrease of 35.4%, while the powder selection efficiency for fine particles ≤0.2mm increases by 20.9%. The decrease in coarse particle selection efficiency means more coarse particles return to the grinding equipment, while the increased efficiency for ≤0.2mm small particles 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 powder selection clarity of this invention is significantly improved, solving the common problem of unclear separation in traditional V-separation, where "coarse particles contain fine particles, and fine particles contain coarse particles," thus achieving the intended purpose.

[0170] According to the experimental statistics in Table 1, in terms of system performance improvement, the system's hourly rate increased from 1.51 t / h to 1.78 t / h, an increase of 17.8%, and the specific surface area of ​​the finished product increased from 3183 cm². 2 / g increased to 3472cm 2 / g, an increase of 7.6%, 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 17.9kW to 21.4kW, an increase of 19.6%, 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 21.1 kWh / t to 18.3 kWh / t, a reduction of 13.2%.

[0171] In summary, compared with traditional V-selection technology, the present invention has a significant effect on increasing production and reducing consumption.

[0172] 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 coarse and fine separation mechanism for a grading and classifying air classifier, characterized in that: The coarse and fine particle separation mechanism includes, from bottom to top, a connected air distribution and material distribution area and a pre-dispersion and coarse particle classification area. The air distribution and material 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 coaxially arranged, 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. The pre-dispersion and coarse particle classification area includes a coarse particle sorting housing, a coarse particle sorting drum, a material distribution device, and a coarse particle sorting drive. The coarse particle sorting drum is located between the coarse particle... Inside the sorting housing, the coarse particle sorting drum includes coarse particle grading blades located around the perimeter, a cage cone coaxially arranged inside the coarse particle grading blades, and a dispersing round steel bar located on the upper inner side of the cage cone. The coarse particle sorting drum has an upper ring plate at the top, a middle ring plate in the middle, and a lower ring plate at the bottom. The coarse particle grading blades are located between the upper, middle, and lower ring plates, close to their outer edges and evenly radially distributed. A support cover plate is provided above the coarse particle sorting housing and the coarse particle grading blades, and the support cover plate is fixedly connected to the coarse particle sorting housing to provide support. The cover plate is connected to the upper ring plate of the coarse particle sorting drum using a dynamic seal, forming the outer seal of the coarse particle sorting drum; the supporting cover plate, together with the coarse particle sorting shell and the coarse particle grading blades, forms the coarse particle grading zone; the top of the cage cone is connected to a feeding pipe, and the feeding pipe is connected to the cage cone using a dynamic seal, forming the inner seal of the coarse particle sorting drum; the material distribution device is coaxially arranged below the cage cone, and the material distribution device and the cage cone form an upper material dispersion zone and a lower material distribution zone; a lifting platform is provided between the coarse particle sorting shell and the air inlet shell. The lifting platform is located outside the outlet of the material distribution area and adjacent to the annular air ring on its lower side; the top surface of the support cover plate is connected to the outlet air duct of the coarse particle sorting drum; the coarse particle sorting drive is connected to the coarse particle sorting drum and the material distribution disc cone via a shaft system, and is used to drive the coarse particle sorting drum and the material distribution disc cone to rotate; the material distribution device consists of a material distribution disc cone and a material distribution disc base plate, the material distribution disc cone is located below the drum cone, the outer edge of the bottom end of the material distribution disc cone is connected to the material distribution disc base plate, and a material flow distribution channel is formed between the material distribution disc base plate and the lower ring plate; the gap H2 between the material distribution disc base plate and the lower ring plate is 250~350 mm. mm, the gap H3 between the bottom plate of the material distribution tray and the outlet of the annular air ring is 50-150 mm, the outer diameter D2 of the bottom plate of the material distribution tray is 0-50 mm smaller than the diameter D1 of the coarse particle sorting drum; the height H5 of the lifting platform is 1.1-1 mm of the gap between the lower ring plate and the outlet of the annular air ring.The material lifting platform has an angle θ4 of 45°–55° with the horizontal direction. When the coarse particle sorting drum and the material distribution device are driven by the same drive, the material distribution channel is evenly distributed with round steel bars. The top end of the round steel bars is connected to the lower ring plate, and the bottom end is connected to the bottom plate of the material distribution tray. The outer ring of the dynamic seal of the material distribution device is fixed to the lower outer edge of the bottom plate of the material distribution tray. The inner ring of the dynamic seal of the material distribution device is provided on the inner ring of the annular air ring. The outer ring and the inner ring of the dynamic seal of the material distribution device constitute the dynamic seal of the material distribution device. The dynamic seal gap of the dynamic seal of the material distribution device is 10–20 mm.

2. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The bottom surface of the support cover plate is fixedly connected to an outer sealing ring located outside the upper ring plate and an inner sealing ring located inside the upper ring plate. The outer sealing ring and the inner sealing ring cooperate with the upper ring plate to form an outer seal of the rotating cage. The outer seal of the rotating cage is a dynamic seal, and the dynamic sealing gap of the outer seal of the rotating cage is 10~20mm. An inner sealing ring of the rotating cage is provided around the outer edge of the cage cone near the feeding pipe. The inner sealing ring of the rotating cage cooperates with the feeding pipe to form an inner seal of the coarse particle sorting rotating cage. The inner seal of the rotating cage is a dynamic seal, and the dynamic sealing gap of the inner seal of the rotating cage is 10~20mm. The radial positions of the inner sealing ring of the rotating cage and the feeding pipe are interchangeable.

3. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The coarse particle sorting drum and the feeding device are driven by the same drive. At this time, the shaft system includes a main shaft and a main shaft sleeve sleeved on the main shaft. A hub is provided on the top of the main shaft. The upper part of the hub is connected to the dispersing round steel, and the lower part of the hub is connected to the feeding device. An anti-wear cap is provided on the top of the hub.

4. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The coarse particle sorting drum and the feeding device are driven independently by two drives. The coarse particle sorting drive includes independent drive one and independent drive two. The shaft system one includes an inner drive shaft and an outer drive sleeve shaft. The upper end of the inner drive shaft is connected to the dispersing round steel through a hub, and the lower end is connected to independent drive one. The outer drive sleeve shaft is sleeved on the inner drive shaft. The upper end of the outer drive sleeve shaft is connected to the feeding device, and the lower end is connected to independent drive two through a pulley set.

5. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The feeding pipe is located directly above the center of the coarse particle sorting drum. The feeding pipe communicates with the interior of the drum's cone-shaped structure, and forms an upward channel for dust-laden airflow between the feeding pipe and the outlet duct of the coarse particle sorting drum. The diameter of the feeding pipe is D4. Where D4 is in mm; P is the system design output in t / h; and the system cyclic load is... Material bulk density t / m 3 Material flow rate m / s, material filling rate The diameter D1 of the coarse particle sorting drum is: Where D1 is in mm; the diameter-to-height ratio of the coarse particle sorting rotary drum. The radial air velocity V2 of the coarse particle sorting drum is 1.8~2.0 m / s; Q is the system's powder sorting air volume, in m³ / s. 3 / h; Among them, system cyclic load Powder concentration g / m 3 Feed concentration kg / m 3 The diameter D3 of the outlet duct of the coarse particle sorting rotary drum is: Where D3 is in mm; the outlet wind speed V1 of the coarse particle sorting drum is 10~15m / s; the angle θ6 between the coarse particle sorting shell and the horizontal direction is 65~75º; and the upper diameter D5 of the inner cavity of the coarse particle sorting shell is 300~500 mm larger than the diameter D1 of the coarse particle sorting drum.

6. The coarse and fine separation mechanism of the classifying air 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.

7. The coarse and fine separation mechanism of the classifying air 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 coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, Below the annular air ring, within the inner cavity of the air inlet housing, is an annular "stepped" or annular "Z" shaped dispersing device. The dispersing plates of the annular "stepped" dispersing device are arranged in a stepped structure with a certain spacing, and 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 housing by a support device. Part of the dispersing plates of the annular "Z" shaped dispersing device are supported on the inner wall of the air inlet housing by a support device, and part are 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, and a dispersing and grading channel is formed between two adjacent dispersing plates on both sides, corresponding to each other. The distance from the projection point of the end of the upper dispersing plate on the lower dispersing plate to the end of the dispersing plate is 100-200 mm. The angle θ7 between the dispersing plates of the annular "stepped" and annular "Z" shaped dispersing devices and the horizontal direction is 40-50º.

9. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The annular air ring includes an inner ring, an outer ring, and several air guide vanes inclined between the inner and outer rings; the top diameter D6 of the inner ring is 40-60mm smaller than the outer diameter D2 of the fabric tray bottom plate, and the angle θ1 between the inner ring and the horizontal direction is 50-70º; the diameter of the outer ring or the inner diameter of the air inlet housing D7 is: Where D7 is in mm; V3 is the outlet velocity of the annular air ring in m / s; D6 is the top diameter of the inner ring of the air ring in mm; and Q is the system's powder-selecting air volume in m³ / s. 3 / h; Number of air guide vanes n: Where n is rounded to the nearest integer; the height of the annular wind ring H4: In this context, H4 is measured in mm. The angle between the air guide vanes of the air ring and the horizontal direction is expressed in degrees (º). 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 is given by t, where t is the thickness of the wind ring guide vane in mm. The outlet wind speed V3 of the annular wind ring is 8~12 m / s, the gap wind speed V4 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 35~45°, the thickness t of the wind ring guide vanes is 10~20 mm, the gap d1 between two adjacent wind ring guide vanes is 100~200 mm, and the ratio S1:S2 = 0.3~0.8 is given by the ratio of the horizontal projection overlap length S1 of two adjacent wind ring guide vanes to the horizontal projection length S2 of a single wind ring guide vane.

10. The coarse and fine separation mechanism of the classifying air classifier according to claim 1, characterized in that, The bottom end of the guide cone is connected to a coarse material guide cone. The angle θ3 between the guide cone and the horizontal direction is 50-70º, and the angle θ5 between the coarse material guide cone and the horizontal direction is 55-65º; the diameter D8 of the guide cone-coarse material guide cone interface is: Where D8 is in mm; V5 is the inlet boost velocity, which is 3~5 m / s.

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