High-efficiency low-resistance thick-thin gradient grading and sorting mechanism and application thereof

Abstract

The application discloses a kind of high-efficiency low-resistance coarse-fine gradient grading and sorting mechanism and its application, from bottom to top including the air distribution material distribution area and pre-dispersion and coarse particle grading area connected;Air distribution material distribution area includes air inlet shell, air inlet, coarse particle outlet, flow guide cone and annular air ring, pre-dispersion and coarse particle grading area includes coarse particle sorting shell, coarse particle sorting rotating cage, distribution device and coarse particle sorting drive, distribution device is located at the top of coarse particle grading area and is located above the upper ring plate of coarse particle sorting rotating cage, distribution device is composed of distribution disc and dispersion vane, distribution disc is fastened on the upper ring plate, and dispersion vane is evenly distributed on distribution disc in uniform radial distribution;Multiple feeding ports are evenly provided on the support cover plate corresponding to the top of distribution disc.The present application has the functions of dispersion, distribution, coarse-fine particle separation, can be well matched with traditional dynamic powder concentrator, complete more clear particle sorting, coarse particle sorting clarity is higher, powder selection resistance is lower, and the service life of wearing parts is longer.

Description

Technical Field

[0001] This invention relates to the field of powder selection technology, and in particular to a high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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 high-efficiency, low-resistance coarse-fine gradient classification and separation mechanism and its application. This mechanism integrates functions of dispersing, distributing, and separating coarse and fine particles. From bottom to top, it consists of an air distribution and distributing zone and a pre-dispersing and coarse particle classification zone. It can work well with traditional dynamic classifiers to achieve clearer particle separation, lower classification resistance, and longer service life of wear parts. It solves a series of problems caused by the common issues of V-separation, allowing coarse particles (d > 0.2 mm) to return to the material bed extrusion equipment, medium-coarse particles (0.045 mm < d < 0.2 mm) to return to the fine grinding equipment, and fine particles (d < 0.045 mm) to be 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 high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism, which includes, from bottom to top, a connected air-and-material distribution area and a pre-dispersing and coarse particle grading 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 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 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. 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;

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

[0011] 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.

[0012] 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 a 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.

[0013] 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.

[0014] The height H5 of the lifting platform is 15-25% of the height H1 of the coarse particle sorting drum, and the angle θ4 between the lifting platform and the horizontal direction is 45-55°.

[0015] Preferably, the diameter D1 (mm) of the coarse particle sorting drum is:

[0016]

[0017] 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);

[0018]

[0019] Where P is the system design output (t / h), the system circulating load k = 3 ± 1, and the powder concentration C s =800±200g / m3 Feed concentration F s =2.5±0.5kg / m 3 .

[0020] The diameter D3 (mm) of the outlet duct of the coarse particle sorting rotary drum is:

[0021]

[0022] Where V1 is the outlet wind speed of the coarse particle sorting drum (m / s), and D4 is the diameter of the feed pipe (mm);

[0023]

[0024] 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, i is the number of feed tubes, generally 2~4.

[0025] The angle θ6 between the coarse particle sorting shell and the horizontal direction is 65-75°, and the diameter D5 of the upper end 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.

[0026] The outer diameter D of the spreading disc 2o (mm), inner diameter D of the spreading disc 2i (mm), height of the dispersed blades h s (mm):

[0027] D 2i =D3 + (150~250)

[0028] D 2O =D 2i +(500~700)

[0029] h s =100±50.

[0030] Preferably, each of the feeding ports is connected to a sub-feeding pipe, and the sub-feeding pipes are connected to the main feeding pipe.

[0031] 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.

[0032] 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.

[0033] 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;

[0034] 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.

[0035] 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°.

[0036] Preferably, the annular air ring includes an inner ring, an outer ring, and several air ring guide vanes inclined between the inner and outer rings; the top diameter D6 of the inner ring is 40-60 mm smaller than the outer diameter D2 of the lower ring plate, the outer diameter D2 of the lower ring plate is 0-50 mm smaller than the diameter D1 of the coarse particle sorting drum, and the angle θ1 between the inner ring and the horizontal direction is 50-70°.

[0037] The outer diameter of the air ring or the inner diameter of the air inlet housing, D7 (mm):

[0038]

[0039] 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); Number of air guide vanes n (units):

[0040]

[0041] Where n is rounded to the nearest integer;

[0042] Annular wind ring height H4 (mm):

[0043]

[0044] 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 (mm) of the wind ring guide blade.

[0045] 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.

[0046] 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°.

[0047] Guide cone - Coarse material guide cone interface diameter D8 (mm):

[0048]

[0049] V5 is the air inlet boost velocity, which is 3 to 5 m / s.

[0050] The advantages and positive effects of this invention are:

[0051] This invention, through the setting of a coarse particle sorting drum, creates a forced vortex field that completely shields coarse particles. This ensures that when the coarse and fine particle sorting mechanism of this invention 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 a combined / semi-finished grinding system. A material distribution device is set at the top of the coarse particle classification zone, where the dispersing blades break up the material cake formed by the material bed extrusion equipment, thereby shortening the huge height difference required for static dispersal, reducing the building height, and saving civil engineering costs. The material distribution disc evenly throws out the broken material cake, which then passes downward through the coarse particle classification zone under gravity, facilitating the settling of coarse particles and the lifting of medium-coarse and fine powders. The setting of a guide cone and annular air ring results in a more uniform airflow distribution compared to a traditional V-type classifier, with a more clearly defined coarse particle size, reducing the amount of coarse particles brought into the sorting zone, lowering the circulating load and material concentration, reducing equipment resistance, and reducing the power consumption of the circulating fan. This coarse-fine gradient 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. It has higher clarity in coarse particle separation, lower air classifier resistance, and longer service life of wear parts. 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

[0052] 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.

[0053] Figure 1 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse and fine gradient sorting mechanism of the present invention;

[0054] Figure 2 yes Figure 1 AA view;

[0055] Figure 3 yes Figure 1 BB view;

[0056] Figure 4 This is the present invention. Figure 1 Partial detail of section D;

[0057] Figure 5 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse and fine gradient sorting mechanism of the present invention, which introduces dust-laden airflow in the form of wind sweeping;

[0058] Figure 6This is a schematic diagram of the annular "stepped" shaped dispersing device of the present invention;

[0059] Figure 7 This is a schematic diagram of the annular "Z"-shaped dispersing device of the present invention;

[0060] Figure 8 This is a schematic diagram of the structure of the high-efficiency, low-resistance coarse and fine gradient separation mechanism of the present invention combined with a traditional dynamic air classifier;

[0061] Figure 9 This is a schematic diagram of the process structure parameters of the high-efficiency, low-resistance coarse and fine gradient sorting mechanism of the present invention;

[0062] Figure 10 This is a schematic diagram of the process structure parameters of the annular "stepped" shaped dispersing device of the present invention;

[0063] Figure 11 This is a schematic diagram of the process structure parameters of the annular "Z"-shaped dispersing device of the present invention.

[0064] 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. Material distribution device; 7. Coarse particle sorting shell; 8. Main feed pipe; 8-1. Sub-feed pipe; 9. Outlet air duct of the particle sorting drum; 10. Air distribution and material distribution area and pre-dispersing and coarse particle grading area; 11. Upper bearing seat; 12. Drum pull rod; 13. Upper seal of the coarse particle sorting drum; 14. Hub; 15. Lower seal of the coarse particle sorting drum; 16. Material distribution disc; 17. Upper ring plate; 18. Dispersing blades; 19. Support cover plate; 20. Middle ring plate; 21. Coarse particle grading blades; 22. Lower ring plate; 23. Dynamic sealing ring; 24. Dynamic sealing groove; 5. Annular air ring; 26. Upper bearing seat support platform; 27. Air inlet shell; 28. Coarse particle outlet; 29. ​​Drive unit base; 30. 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. Foundation support; 40. Support flange; 41. Main shaft; 42. Coarse particle sorting drive; 43. Dynamic seal outer ring; 44. Dynamic seal inner ring; 45. Annular "stepped" shaped dispersing device; 46. Dispersing plate; 47. Annular "Z" shaped dispersing device; 48. Grading equipment or grinding equipment; 49. Support device; 50. Connecting rib plate. Detailed Implementation

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Example

[0069] Please see Figures 1 to 8 This invention provides a high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism, which includes, from bottom to top, a connected air-fabricating area and a pre-dispersing and coarse particle grading area.

[0070] 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 lower ring plate 22. The outer diameter D2 of the lower ring plate 22 is 0-50 mm smaller than the diameter D1 of the coarse particle sorting drum 5. 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 vanes 3 is 18±2 m / s. The angle θ2 between the wind ring guide vanes 3 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. 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.

[0071] Above the annular air ring 25 is the pre-dispersion and coarse particle classification zone. The pre-dispersion and coarse particle classification zone 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 and cage cones 31 coaxially arranged inside the coarse particle classification blades 21. The top of the coarse particle sorting rotating cage 5 is provided with an upper ring plate 17, the middle with a middle ring plate 20, and the bottom 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 in a dynamic seal manner, forming the upper seal 13 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. 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 5 is connected to the inner ring 4 of the annular air ring 25 in a dynamic seal manner, forming the lower seal 15 of the coarse particle sorting drum.

[0072] The feeding device 6 is located at the top of the coarse particle grading zone and above the upper ring plate 17 of the coarse particle sorting drum 5. The feeding device 6 consists of a feeding disc 16 and dispersing blades 18. The feeding disc 16 is fastened to the upper ring plate 17 by bolts, and the dispersing blades 18 are evenly radially distributed on the feeding disc 16.

[0073] Multiple feeding ports 30 are evenly provided on the support cover plate 19 at the position directly above the fabric tray 16. Each feeding port 30 is connected to a sub-feeding pipe 8-1 and is connected to the main feeding pipe 8.

[0074] The seal 13 on the coarse particle sorting drum is a groove-shaped dynamic seal structure, and the groove-shaped dynamic seal structure is close to the inner edge of the feeding device 6 to prevent coarse particles from passing directly through the coarse particle sorting drum 5 without being sorted and entering the subsequent sorting process. The groove-shaped 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 clearance between the upper, lower, left and right sides is 10-20mm.

[0075] A dynamic sealing outer ring 43 is fixedly connected to the lower outer edge of the lower ring plate 22. A dynamic sealing inner ring 44 is provided on the inner ring 4 of the annular air ring 25. The dynamic sealing outer ring 43 and the dynamic sealing inner ring 44 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 44 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 43 is fixedly connected to the lower side of the outer edge of the lower ring plate 22.

[0076] 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.

[0077] 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 15-25% of the height H1 of the coarse particle sorting drum, and the angle θ4 between the lifting platform and the horizontal direction is 45-55°. The lower side of the lifting platform 34 is adjacent to the annular air ring 25. The functions of the lifting platform 34 are: first, to cooperate with the airflow of the annular air ring 25 to guide the material to be sorted to the inner wall of the upper shell, where it is dispersed by impact, thus increasing the coarse and fine classification; second, to uniformly distribute air to the coarse particle sorting drum 5.

[0078] The coarse particle sorting drive 42 is connected to the coarse particle sorting rotating drum 5 via shaft system 1, and is used to drive the coarse particle sorting rotating drum 5 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. 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 1.

[0079] like Figure 1 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 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 inner edge of the middle ring plate 20 is connected to the cage cone 31 via tie rods or stiffeners. The middle ring plate 20 strengthens and fixes the coarse particle grading blades 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.

[0080] 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 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 5.

[0081] like Figure 5 As shown, 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.

[0082] To further improve the clarity of particle classification, specifically, an annular "stepped" shaped dispersing device 45 is provided below the annular air ring 25 and inside the air inlet housing 27 (see...). Figure 6 ) or a ring-shaped "Z"-shaped dispersing device 47 (see Figure 7 The dispersing plates 46 of the annular "stepped" dispersing device 45 are all supported on the inner wall of the air inlet housing 27 by the support device 49, and are arranged in a stepped structure with a certain spacing. Adjacent dispersing plates 46 are connected by connecting ribs 50. The dispersing plates 46 of the annular "Z" shaped dispersing device 47 are partly supported on the inner wall of the air inlet housing 27 by the support device 49, and partly supported on the outer wall of the guide cone 36 by the support device 49. The dispersing plates 46 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 46 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 45 or the annular "Z" shaped dispersing device 47. After being impacted by the corresponding dispersing plates 46, it is dispersed and then blown by the rising airflow between the dispersing plates 46. 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.

[0083] The grading method for a high-efficiency, low-resistance coarse-fine gradient sorting mechanism is as follows:

[0084] 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 5, 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 5 and are carried by the airflow into the subsequent fine sorting 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 25, and are dispersed by the air ring guide vanes 3 and the air ring below the annular air ring 25. The annular "stepped" shaped dispersing device 45 or the annular "Z" shaped dispersing device 47 further disperses and classifies the material, ensuring that the small amount of medium and coarse powder and fine powder mixed in the "clump" of material, as well as the fine powder adhering to the surface of the 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. The dispersed material is blown at high speed, and most of the coarse particles enter the coarse particle outlet 28 and return to the material bed extrusion equipment for further grinding. A small portion of the coarse particles, most of the medium and coarse powder, and fine powder enter the coarse particle sorting area with the airflow for secondary sorting. By feeding the material at the top of the coarse particle classification area, the coarse particle sorting clarity is higher, the resistance of the classifier is lower, and the service life of the wear parts is longer.

[0085] The process structure parameters of the present invention are as follows: Figures 9-11 As shown, to facilitate the explanation of the design method of the present invention, the following main process structure parameters are set:

[0086] 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, number of feed pipes i, 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), lower ring plate 22 outer diameter D2 (mm), coarse particle sorting drum 5 height H1 (mm), coarse particle sorting drum 5 diameter-to-height ratio D / H, 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), 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 diameter D8 (mm), annular air ring 25 height H4 (mm), lifting platform 34 height H5 (mm) mm), the inner ring of the wind ring 4 has an angle θ1 (°) with the horizontal direction, the number of wind ring guide vanes 3 n (pieces), the thickness of the wind ring guide vanes 3 t (mm), the angle of the wind ring guide vanes 3 with the horizontal direction θ2 (°), the guide cone 36 has an angle θ3 (°) with the horizontal direction, the lifting platform 34 has an angle θ4 (°) with the horizontal direction, the coarse material guide cone has an angle θ5 (°) with the horizontal direction, the coarse particle sorting shell 7 has an angle θ6 (°) with the horizontal direction, coarse The following parameters are listed: outlet velocity of particle sorting drum 5 (V1, m / s), radial velocity of coarse particle sorting drum 5 (V2, m / s), outlet velocity of annular air ring 25 (V3, m / s), gap velocity of air ring guide vanes 3 (effective velocity of annular air ring 25) (V4, m / s), lifting velocity of inlet 1 (V5, m / s), blowing velocity of annular "stepped" shaped dispersing device (V6, m / s), and blowing velocity of annular "Z" shaped dispersing device (V7, m / s). ), the gap between two adjacent wind ring guide vanes 3 d1 (mm), the horizontal projection length of wind ring guide vane 3 S2 (mm), the horizontal projection overlap length of two adjacent wind ring guide vanes 3 S1 (mm), the gap between two adjacent dispersing plates of the annular "stepped" dispersing device (from top to bottom) d4 (mm), d5 (mm), d6 (mm), the lower diameter 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.

[0087] The calculation steps for the above main process parameters are as follows:

[0088] 1) System powder selection air volume Q (m³) 3 / h):

[0089] 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):

[0090]

[0091] Where, k = 3 ± 1, C s =800±200g / m 3 F s =2.5±0.5kg / m 3 .

[0092] 2) Coarse particle sorting rotary drum 5, diameter D1 (mm):

[0093]

[0094] 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).

[0095] 3) Height H1 (mm) of coarse particle sorting drum 5:

[0096]

[0097] 4) Lower ring plate 22 outer diameter D2 (mm):

[0098] D2 = D1 - (0 ~ 50) (4)

[0099] 5) Fabric disc 16 outer diameter D 2o (mm), inner diameter D of fabric tray 2i (mm), height of the dispersed blades h s (mm):

[0100] D 2i =D3+(150~250) (5)

[0101] D 2O =D 2i +(500~700) (6)

[0102] h s =100±50 (7)

[0103] 6) Inner ring diameter D6 (mm):

[0104] D6 = D2 - (40~60) (8)

[0105] 7) 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] 8) 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] 9) Diameter D5 (mm) of the upper end of the inner cavity of the coarse particle sorting shell 7:

[0112] D5=D1+(400±100)mm (11)

[0113] 10) Feed pipe 8-1, 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, i is the number of feed tubes, generally 2~4.

[0116] 11) 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] 14) Number n (blades) of the wind ring guide vanes:

[0120]

[0121] 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.

[0122] 15) Height H4 (mm) of the annular air ring 25:

[0123]

[0124] 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.

[0125] 16) Height H5 (mm) of the lifting platform 34:

[0126] H5=(0.2±0.05)H1 (18)

[0127] 17) The angle θ1 (°) between the four inner rings of the wind ring and the horizontal direction:

[0128] θ1=60±10 (19)

[0129] 18) The angle θ3 (°) between the guide cone 36 and the horizontal direction:

[0130] θ3=60±10 (20)

[0131] Preferably, θ3 = θ1;

[0132] 19) The angle θ4 (°) between the lifting platform 34 and the horizontal direction:

[0133] θ4=50±5 (21)

[0134] 20) The angle between the coarse material guide cone 38 and the horizontal direction is θ5 (°):

[0135] θ5=60±5 (22)

[0136] 21) The coarse particle sorting shell 7 has an angle θ6 (°) with the horizontal direction:

[0137] θ6=70±5 (23)

[0138] 22) The diameter of the lower end of the dispersing plate of the annular "stepped" dispersing device 45, from top to bottom, is D9 (mm), D... 10 (mm), D 11 (mm), D 12 (mm):

[0139]

[0140] D 12 =D8+(500~600) (25)

[0141]

[0142]

[0143] 23) 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:

[0144]

[0145] Among them, the blowing speed of the annular "stepped" shaped dispersing device is V6 = 14 ± 2 (m / s);

[0146] 24) The diameter of the lower end of the dispersing plate of the annular "Z"-shaped dispersing device 47, from top to bottom, is D 13 (mm), D 14 (mm), D 15 (mm), D 16 (mm):

[0147]

[0148]

[0149] 25) 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:

[0150]

[0151]

[0152]

[0153] Among them, the blowing speed of the annular "Z"-shaped dispersing device is V7 = 14 ± 2 (m / s);

[0154] 26) 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):

[0155] S3=S4=S5=150±50 (34)

[0156] If S3, S4, and S5 cannot meet the requirements of equation (34), then D9 and D can be adjusted appropriately. 10 D 11 Calculated value;

[0157] 27) 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 S7 (mm), S8 (mm), and S9 (mm):

[0158] S7=S8=S9=150±50 (35)

[0159] If S7, S8, and S9 cannot meet the requirements of (35), then D can be adjusted appropriately. 14 D 15 D 16 Calculated value;

[0160] 28) 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:

[0161] θ7=45±5 (36)

[0162] To verify the technical effects of this invention, a semi-industrial combined grinding test system based on TRP ф400x100mm-ф750x2500mm was used. The high-efficiency, low-resistance coarse-fine gradient classification and separation mechanism of this invention was combined with a traditional dynamic air classifier, and the system's air volume for air classification was designed to be 4000 m³ / h. 3 / h, a high-efficiency, low-resistance coarse and fine gradient classifier with specifications CEф300*550-Fф300-570mm was compared with the original V-type classifier in the same system under basically the same working conditions. 28 sets of comparative tests were conducted on grinding PO425 cement. The test statistical data results are shown in Table 1.

[0163] Table 1 Comparison of the air classifier of the present invention with the traditional V-classifier.

[0164]

[0165]

[0166] 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.

[0167] 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%.

[0168] In summary, compared with traditional V-selection technology, the present invention has a significant effect on increasing production and reducing consumption.

[0169] 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 grading and sorting mechanism, characterized in that: The coarse and fine gradient grading and sorting mechanism includes, from bottom to top, a connected air-fabricating area and a pre-dispersing and coarse particle grading area. 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 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. 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; The coarse particle sorting drive is connected to the coarse particle sorting rotating drum via a shaft system, and is used to drive the coarse particle sorting rotating drum to rotate.

2. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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 mates with the dynamic sealing groove. The mating gaps in all directions are 10~20mm.

3. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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-resistance coarse-fine gradient grading and sorting mechanism 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. The height of the lifting platform H 5 represents the height of the coarse particle sorting drum. H 15-25% of 1, the angle between the lifting platform and the horizontal direction θ 4 is 45-55°.

5. The high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism according to claim 1, characterized in that, The diameter of the coarse particle sorting drum D 1: in, D The unit of 1 is mm, and the ratio of the diameter to the height of the rotating drum for coarse particle sorting is... The radial wind speed of the coarse particle sorting drum is 1.8~2.

0. V 2 is 1.5~2.5 m / s; Q The system's powder selection air volume is expressed in meters (m³). 3 / h: in, P The system design output is expressed in t / h, and the system cyclic load is given. Powder concentration g / m 3 Feed concentration kg / m 3 ; The diameter of the outlet duct of the coarse particle sorting rotary drum D 3: in, D The unit of 3 is mm. V 1 = 10~15 m / s is the outlet wind velocity of the coarse particle sorting drum. D 4 represents the diameter of the feed tube; in, D The unit of 4 is mm. P The system's designed output and cyclic load are as follows: Material bulk density t / m 3 Material flow rate m / s, material filling rate , i The number of feed tubes; The angle between the coarse particle sorting shell and the horizontal direction θ 6 is 65-75°, the diameter of the upper end of the inner cavity of the coarse particle sorting shell. D 5. Coarse particle sorting drum diameter D 1 large 300~500 mm; The outer diameter of the fabric disc D 2O Inner diameter of fabric tray D 2i , Disperse the height of the blades h s : in, D 2O , D 2i , h s All units are mm.

6. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism according to claim 1, characterized in that, Each of the feeding ports is connected to a sub-feeding pipe, and the two are connected together to the main feeding pipe.

7. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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.

8. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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.

9. The high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism 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. 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 7 is 40-50°.

10. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism 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 top diameter of the inner ring is... D 6 compared to the outer diameter of the lower ring plate D 2. Smaller 40-60mm, lower ring plate outer diameter D 2. Coarse particle sorting drum diameter D 1. Small 0~50mm, the angle between the inner ring of the wind ring and the horizontal direction. θ 1 is 50–70°; outer diameter of the air ring or inner diameter of the air inlet casing D 7: in, D All units for 7 are mm; V 3 represents the outlet velocity of the annular wind ring, in m / s; D 6 represents the top diameter of the inner ring of the air ring, in mm; Q The system's powder selection air volume is expressed in meters (m³). 3 / h; Number of wind ring guide vanes n : in, n Round to the nearest whole number, unit: one; Annular wind ring height H 4: in, H The unit for 4 is mm; The angle between the air guide vanes of the air ring and the horizontal direction, expressed in degrees (°). 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 air guide vanes in the air ring is in mm. The annular wind ring outlet wind speed V 3 is 8~12 m / s, the gap velocity of the wind ring guide vanes. V 4 is 18±2 m / s, and the angle between the wind ring guide vanes and the horizontal direction is... θ 2 is 35-45°, and the thickness of the wind ring guide blades is... t The gap between two adjacent air guide vanes is 10~20mm. d 1 represents the horizontal projection overlap length of two adjacent wind ring guide vanes, ranging from 100 to 200 mm. S 1. Horizontal projected length of a single wind ring guide vane S The ratio of 2, S1:S2, is 0.3 to 0.

8.

11. The high-efficiency, low-resistivity coarse-fine gradient grading and sorting mechanism according to claim 1, characterized in that, The bottom end of the guide cone is connected to a coarse material guide cone, and the guide cone forms an angle with the horizontal direction. θ 3 is 50-70°, the angle between the coarse material guide cone and the horizontal direction. θ 5 is 55-65°; Guide cone - Coarse material guide cone interface diameter D 8: in, D The unit for 8 is mm; V 5 increases the airflow speed at the air inlet. V 5 represents 3~5 m / s.

12. An application of the high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism according to any one of claims 1-11, characterized in that, The high-efficiency, low-resistance coarse-fine gradient grading and sorting mechanism can be applied to a grading and classifying air classifier.

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