CN117066115B

CN117066115B - Coarse-fine gradient classifying powder concentrator and classifying method and design method thereof

Info

Publication number: CN117066115B
Application number: CN202311020536.5A
Authority: CN
Inventors: 豆海建; 李洪; 王维莉; 李铭哲; 刘智涛
Original assignee: Tianjin Cement Industry Design and Research Institute Co Ltd
Current assignee: Tianjin Cement Industry Design and Research Institute Co Ltd
Priority date: 2023-08-14
Filing date: 2023-08-14
Publication date: 2026-01-16
Anticipated expiration: 2043-08-14
Also published as: CN117066115A

Abstract

This invention discloses a coarse-fine gradient classifier and its classification method and design method. From bottom to top, it forms a series of interconnected air distribution and material distribution zones, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return connection zone, and a medium-coarse and fine powder classification zone. The air distribution and material distribution zone includes an air inlet shell, an air inlet, a coarse particle outlet, a guide cone, and an annular air ring. The pre-dispersion and coarse particle classification zone includes a coarse particle sorting shell, a coarse particle sorting drum, a material distribution device, and a coarse particle sorting drive. The feeding and medium-coarse powder return connection zone and the medium-coarse and fine powder classification zone include a feeding pipe, a medium-coarse powder return pipe, and a fine classification device. In addition to the separation function of traditional dynamic separators, this invention is a combined device with dispersion, material distribution, and coarse-medium-fine particle separation. It can achieve clearer coarse-fine particle gradient classification without using V-separation, solving a series of problems caused by the common issues of V-separation and meeting the material classification requirements of combined/semi-finished grinding systems.

Description

Coarse-fine gradient classifying powder concentrator and classifying method and design method thereof

Technical Field

The invention relates to the technical field of powder selection, in particular to a coarse-fine gradient grading powder selector, a grading method and a design method thereof.

Background

In the grinding process, since the material bed extrusion equipment such as a roller press and a vertical roller mill is more suitable for grinding particles (d is more than 0.2 mm) with larger particle diameters, the excessive fine materials are difficult to form a stable material bed to cause vibration of the equipment, the idle work is increased, the energy consumption is higher, meanwhile, water spraying for stabilizing the material bed can also influence the quality of a finished product, and the fine grinding equipment such as a tube mill, a stirring mill and the like is more suitable for grinding particles (d is less than 0.2 mm) with smaller particle diameters, the grinding efficiency is reduced due to the excessive coarse materials, and the large particles run coarsely, so that the fineness requirement of the finished product cannot be met. Accordingly, in a combined/semi-finishing system consisting of an extrusion device and a fine grinding device, corresponding demands are made on the classification of the coarse and fine gradients.

In the traditional combined/semi-finished grinding system, the material pre-ground by a roller press is brought into a fine dynamic powder concentrator by a V-shaped powder concentrator for separation. The V-shaped powder concentrator is used for classifying semi-finished products completely by virtue of an inertial force field, the controllability of the classifying process is poor, the problem of local high wind speed caused by wind short circuit exists at the top of the V-shaped powder concentrator, so that a large amount of coarse particles directly enter the fine dynamic powder concentrator, on one hand, the concentration of the powder concentrator is increased, on the other hand, the rotation speed of the powder concentrator is inevitably increased under the condition of controlling the fineness of the same finished product due to the entering of the coarse particles, and further the efficiency of the powder concentrator is reduced, the cyclic load is increased, the definition of the classified powder is reduced, more finished products are recycled to the roller compactor, the material layer is unstable, the vibration and the grinding efficiency of the mill are reduced, the time of the bench is reduced and the electricity consumption is increased, and meanwhile, the powder returned by the dynamic powder concentrator entering the roller compactor is mixed with coarse particles with d of more than 0.2mm, so that the grinding load of the tube mill is increased, the powder concentrator is reduced, the powder concentrating efficiency and the grinding efficiency are reduced, and the time of the bench is reduced and the electricity consumption is increased.

Disclosure of Invention

In order to solve the above-mentioned series of problems caused by the commonality problem of unclear V-selection coarse and fine separation in the existing combined/semi-final grinding system, the invention provides a coarse and fine gradient classifying powder concentrator, a classifying method and a designing method thereof, wherein the coarse and fine gradient classifying powder concentrator has the coarse and fine powder separating function of the traditional dynamic powder concentrator, and is a combined device with the functions of scattering, distributing and coarse and fine particle separating, which is sequentially provided with a wind distribution and distribution area, a pre-scattering and coarse particle classifying area, a feeding and coarse powder return connection area, a coarse and fine powder classifying area from bottom to top. Unlike the V-shaped powder concentrator and the fine dynamic powder concentrator matched with the traditional combined/semi-finished powder concentrating system, the coarse-fine gradient classifying powder concentrator can finish clearer gradient classification of coarse and fine particles under the condition of not using the V-shaped powder concentrator, solves a series of problems caused by the V-shaped powder concentrating problem, enables coarse particles (d >0.2 mm) to return to a material bed extrusion device, fine powder is taken as a finished product to be selected away (d <0.045 mm), and middlings (0.045 mm < d <0.2 mm) to return to the fine powder concentrating device, so that the requirements of the combined/semi-finished powder concentrating system on materials with different fineness are met.

The invention is realized in such a way that the coarse-fine gradient classifying powder concentrator is provided with an air distribution and distribution area, a pre-scattering and coarse particle classifying area, a feeding and coarse powder return material connecting area and a coarse powder and fine powder classifying area which are sequentially connected from bottom to top.

The air distribution area comprises an air inlet shell, an air inlet, coarse particle outlets, a guide cone and an annular air ring, wherein the air inlet is located on the side face of the air inlet shell, the coarse particle outlets are located at the bottom of the air inlet shell, the guide cone is located inside the air inlet shell and is coaxially arranged, and the annular air ring is installed between the outer edge above the guide cone and the inner edge at the top of the air inlet shell.

The coarse particle sorting rotating cage comprises coarse particle sorting blades, a cage frustum and scattered round steel, wherein the coarse particle sorting blades are arranged around the coarse particle sorting rotating cage, the cage frustum is coaxially arranged inside the coarse particle sorting blades, the scattered round steel is arranged at the upper part of the inner side of the cage frustum, an upper annular plate is arranged at the top of the coarse particle sorting rotating cage, a middle annular plate is arranged in the middle of the coarse particle sorting rotating cage, a lower annular plate is arranged at the bottom of the coarse particle sorting rotating cage, coarse particle sorting blades are arranged among the upper annular plate, the middle annular plate and the lower annular plate and are distributed in a uniform radial mode and close to the outer edges of the upper annular plate, the middle annular plate and the lower annular plate, a supporting cover plate is arranged above the coarse particle sorting shell and the coarse particle sorting blades, the bottom surface of the supporting cover plate is fixedly connected with the coarse particle sorting shell, the bottom surface of the supporting cover plate is connected with the upper annular plate of the coarse particle sorting rotating cage in a dynamic sealing mode, the outer sealing of the rotating cage of the coarse particle sorting rotating cage is formed, and the coarse particle sorting cover plate and the coarse particle sorting rotating cage form a coarse particle sorting region together.

The material distribution device comprises a material distribution tray frustum and a material distribution tray bottom plate, wherein the material distribution tray frustum is coaxially arranged below the cage frustum, the outer edge of the bottom end of the material distribution tray frustum is connected with the material distribution tray bottom plate, a material flow material distribution channel is formed between the material distribution tray bottom plate and the lower annular plate, a material lifting table is arranged between the coarse particle sorting shell and the air inlet shell, the material lifting table is correspondingly arranged on the outer side of the material flow material distribution channel and the lower side of the material lifting table is close to the annular air ring, and the material distribution tray bottom plate is connected with the inner ring of the annular air ring in a dynamic sealing mode to form dynamic sealing of the material distribution device.

The coarse particle sorting drive is connected with the coarse particle sorting rotating cage and the distribution disc frustum through a shafting I and is used for driving the coarse particle sorting rotating cage and the distribution disc frustum to rotate.

The feeding and coarse powder return material connection area and the coarse powder and fine powder classification area comprise a feeding pipe, a coarse powder return material pipe and a fine classification device, wherein the feeding pipe penetrates through a fine classification shell of the fine classification device and is communicated with the interior of a cage frustum through an inner connection pipe, the inner connection pipe is connected with the cage frustum in a dynamic sealing mode to form a rotating cage inner seal of a coarse particle sorting rotating cage, one end of the coarse powder return material pipe is connected with a coarse powder return material cone of the fine classification device, the other end of the coarse powder return material pipe penetrates out of the fine classification shell, the coarse powder return material cone is communicated or not communicated with the interior of the cage frustum, and the fine classification shell is connected with a supporting cover plate to form a dust-containing airflow ascending channel.

Preferably, the feeding pipe is positioned right above the center of the coarse particle sorting rotating cage, and the fine grading shell is connected with the supporting cover plate through an external connecting air pipe;

the inner sealing ring of the rotating cage is arranged at the position, close to the inner connecting pipe, of the outer periphery of the cage frustum, the inner sealing ring of the rotating cage is matched with the inner connecting pipe to form the inner sealing of the rotating cage of the coarse particle sorting rotating cage, the dynamic sealing gap of the inner sealing of the rotating cage is 10-20 mm, and the radial positions of the inner sealing ring of the rotating cage and the inner connecting pipe are interchangeable;

the bottom surface of the support cover plate is fixedly connected with an outer sealing outer ring positioned at the outer side of the upper ring plate and an outer sealing inner ring positioned at the inner side of the upper ring plate, the outer sealing outer ring and the outer sealing inner ring are matched with the upper ring plate to form a rotating cage outer seal, and the dynamic sealing gap of the rotating cage outer seal is 10-20 mm;

The automatic sealing device is characterized in that a dynamic sealing outer ring of the distributing device is fixedly connected to the outer edge of the lower side of the bottom plate of the distributing disc, a dynamic sealing inner ring of the distributing device is arranged on the inner ring of the annular air ring, the dynamic sealing outer ring of the distributing device and the dynamic sealing inner ring of the distributing device are matched to form dynamic sealing of the distributing device, and the dynamic sealing gap of the dynamic sealing of the distributing device is 10-20 mm.

The upper ring plate is connected with the cage frustum through a rotating cage pull rod, the arrangement direction of the rotating cage pull rod is consistent with the rotation direction of the coarse particle sorting rotating cage and is uniformly distributed along the axis of the coarse particle sorting rotating cage, the inner edge of the lower ring plate is connected with the cage frustum, and the inner edge of the middle ring plate is connected with the cage frustum through a pull rod or a rib plate.

Preferably, the feeding pipe at the feeding part of the coarse-fine gradient classifying powder separator can be omitted, replaced by being connected with other static classifying equipment or grinding equipment in series, and dust-containing airflow is introduced in a wind sweeping mode.

Preferably, the coarse particle sorting rotating cage and the material distribution disc frustum are driven together by the same driving device, at this time, the first shafting comprises a main shaft and a main shaft sleeve sleeved on the main shaft, a hub is arranged at the top of the main shaft, the upper part of the hub is connected with the scattering round steel, the lower part of the hub is connected with the material distribution disc frustum, and an anti-abrasion cap is arranged at the top of the hub.

Preferably, the coarse particle sorting rotating cage and the material distribution disc frustum are independently driven by two drives respectively, at the moment, the coarse particle sorting driving comprises an independent driving first and an independent driving second, the shafting first comprises an inner transmission shaft and an outer transmission sleeve shaft, the upper end of the inner transmission shaft is connected with the scattering round steel through a hub, the lower end of the inner transmission shaft is connected with the independent driving first, the outer transmission sleeve shaft is sleeved on the inner transmission shaft, the upper end of the outer transmission sleeve shaft is connected with the material distribution disc frustum, and the lower end of the outer transmission sleeve shaft is connected with the independent driving second through a belt pulley group.

Preferably, the wind distribution area, the pre-scattering and coarse particle classifying area, the feeding and coarse powder return material connecting area and the coarse powder and fine powder classifying area can be used as independent two parts and are independently separated, the coarse powder return material cone hopper and the cage frustum are not communicated at different heights according to the process requirements, the external connecting air pipe is replaced by a non-standard connecting air pipe, and the wind distribution area, the pre-scattering and coarse particle classifying area are connected with the coarse powder and fine powder classifying area through the non-standard connecting air pipe.

Preferably, the air inlet is connected with classifying equipment or grinding equipment, and the dust-containing airflow to be separated is introduced into the air inlet shell in an air sweeping mode.

Preferably, an annular step-shaped scattering device or an annular Z-shaped scattering device is arranged below the annular air ring and in the inner cavity of the air inlet shell;

The scattering plates of the annular ladder-shaped scattering device are arranged in a ladder-shaped structure with a certain interval overlapped, the projection overlapping distance of bus bars of two adjacent scattering plates is 100-200 mm, the scattering plates are respectively supported on the inner wall of the air inlet shell through the supporting device, and the scattering plates are connected through the connecting rib plates.

The annular Z-shaped scattering device comprises an annular Z-shaped scattering device, a supporting device, a scattering plate, a horizontal direction included angle theta ₉ and an annular Z-shaped scattering device, wherein one part of the scattering plate of the annular Z-shaped scattering device is supported on the inner wall of an air inlet shell through the supporting device, the other part of the scattering plate is supported on the outer wall of a guide cone through the supporting device, the scattering plates on two sides are respectively arranged in a stepped structure with a certain interval overlapped, scattering classification channels are formed between two adjacent scattering plates on two sides and correspond to each other, the distance between the projection point of the tail end of the upper scattering plate on the tail end of the lower scattering plate and the tail end of the scattering plate is 100-200 mm, and the included angles theta ₉ of the scattering plates of the annular Z-shaped scattering device and the annular Z-shaped scattering device in the same horizontal direction are 40-50 degrees.

Preferably, the annular wind ring comprises a wind ring inner ring, a wind ring outer ring and a plurality of wind ring wind guide blades obliquely arranged between the wind ring inner ring and the wind ring outer ring, the gap wind speed of the wind ring wind guide blades is 18+/-2 m/S, the included angle theta ₂ between the wind ring wind guide blades and the horizontal direction is 35-45 degrees, and the ratio S ₁:S₂ = 0.3-0.8 of the horizontal projection overlapping length of two adjacent wind ring wind guide blades and the horizontal projection length of a single wind ring wind guide blade.

Preferably, when coarse particle sorting rotating cage and distributing device are driven jointly by the same drive, distributing round steel is uniformly distributed on one circle of material flow distributing channel, the top end of the distributing round steel is connected with the lower annular plate, and the bottom end of the distributing round steel is connected with the distributing disc bottom plate.

Preferably, the bottom of the diversion cone is connected with a coarse material diversion cone.

Preferably, when the middling feed back cone hopper is communicated with the inside of the cage frustum, a feed back control device is arranged in the middling feed back cone hopper, the feed back control device comprises middling guide cones, middling overflow holes are formed in the middling guide cones so that the feed back control device is communicated with the inside of the cage frustum, an annular area for collecting middlings is formed between the middling guide cones and the middling feed back cone hopper, a plurality of feed separating cones are uniformly distributed in the annular area along the circumferential direction, the feed separating cones are formed by two plates which are lapped together to form a ridge shape, the annular area is divided into a plurality of funnel-shaped material areas together by the middling guide cones positioned in the center of the feed separating cones, a feed back pipe interface is arranged at the bottom of each funnel-shaped material area, the feed back pipe interface is in a large-down funnel shape, the lower end of the feed back pipe interface is connected with a middling feed back pipe, and a middling feed back control valve is arranged on the middling feed back pipe.

According to the classification method of the coarse-fine gradient classification powder separator, materials to be separated are fed into a pre-scattering and coarse particle classification area in equipment through a feeding pipe of a feeding and coarse powder return material connection area, the materials are scattered onto scattered round steel in a coarse particle separation rotating cage, after the scattered round steel is fully scattered, the materials are distributed and evenly scattered onto a material scattering table through a distribution disc conical table and a distribution disc bottom plate rotating on the lower side, then fall at an annular air ring of the air distribution area, further impact on an air ring air guide blade, are sufficiently scattered again through the air ring air guide blade, so that fine particles mixed between material flows and fine powder adhered to the surface of the coarse particles are fully scattered and separated, sorting air enters from an air inlet, and then enters into the annular air ring, concentrated high-speed flushing is conducted on the scattered materials by the air ring air guide blade, the coarse particles are classified for the first time, most of coarse particles pass through a coarse particle outlet return material bed extrusion device under the action of gravity, small part of coarse particles and most coarse powder pass through the annular air ring upwards along with the sorting air flow, enter into a coarse powder classification valve, pass through a coarse powder classification valve and then pass through a coarse powder classification valve, and then pass through a coarse powder classification valve to be further coarse powder classification valve, and coarse powder in the coarse powder is further classified into a coarse powder classification valve, and fine powder classification valve and coarse powder is further fed into a coarse powder classification device through a coarse powder classification valve through a fine powder classification valve to be further classification valve.

The design method of the coarse-fine gradient classifying powder concentrator comprises the following steps of:

1) System powder selection air quantity Q (m ³/h):

According to the system design yield P (t/h), the system cyclic load k, the powder selecting concentration C _s(g/m³, the feeding concentration F _s(kg/m³), the system powder selecting air quantity Q (m ³/h) is calculated:

Wherein, the cyclic load k=3±1, the powder concentration C _s＝800±200g/m³, the feeding concentration F _s＝2.5±0.5kg/m³.

2) Coarse particle sorting rotor diameter D ₁ (mm):

Wherein the diameter-to-height ratio D/H of the coarse particle sorting rotating cage is 1.8-2.0, and the radial wind speed V ₂ of the coarse particle sorting rotating cage is 1.5-2.5 (m/s).

3) Coarse particle sorting rotor height H ₁ (mm):

4) The outer diameter D ₂ (mm) of the bottom plate of the central feeding cloth tray:

D₂＝D₁-(0~50) (4)

5) Wind ring inner diameter D ₆ (mm):

D₆＝D₂-(40~60) (5)

6) The diameter of the outer ring of the air ring or the inner diameter D ₇ (mm) of the air inlet shell:

Wherein V ₃ = 10 ± 2 is the annular wind ring outlet wind speed (m/s);

7) Diameter D ₈ (mm) of interface of guide cone and coarse material guide cone:

wherein, V ₅ = 4 + -1 is the lifting wind speed (m/s) of the air inlet;

8) Coarse particle sorting shell inner cavity upper end diameter D ₅ (mm):

D₅＝D₁+(400±100)mm (8)

9) Inner connecting tube diameter D ₄ (mm):

Wherein, the system cyclic load k=3±1, the material volume weight ρ _s =1.5 to 1.8 (t/m 3), the material flow velocity V _s =1±0.5 (m/s), and the material filling rate epsilon=0.5 to 0.8;

10 External connection air pipe diameter D ₃ (mm):

Wherein V ₁ = 10-15 is coarse particle sorting rotor cage outlet wind speed (m/s);

11 N ₁ (number) of coarse powder feed back pipes and n ₂ (number) of coarse powder overflow holes:

n₁＝n₂=3±1 (11)

12 Coarse powder feed back tube diameter d ₂ (mm):

Wherein, the system circulation load k=3±1, the material volume weight ρ _s＝1.5～1.8(t/m³), the material flow velocity V _s =1±0.5 (m/s), the material filling rate epsilon=0.5-0.8, and the number n ₁ =3 (number) of medium coarse powder return pipes;

13 Coarse powder overflow aperture diameter d ₃ (mm):

d₃＝d₂ (13)

14 Gap H ₂ (mm) between the lower annular plate and the bottom plate of the distributing disc:

H₂=300±50(mm) (14)

15 A cloth tray bottom plate is separated from an annular air ring outlet gap H ₃ (mm):

H₃=100±50(mm) (15)

16 Number n ₃ (number of) wind guide blades of the wind ring:

Wherein d ₁ is the gap between two adjacent wind guiding blades of the wind ring, d ₁＝100～200(mm),V₄ is the gap wind speed of the wind guiding blades of the wind ring, and V ₄＝18±2(m/s),n₃ is rounded to an integer;

17 Annular wind ring height H ₄ (mm):

Wherein θ ₂ =40±5 is the included angle (DEG) between the wind-guiding blades of the wind ring and the horizontal direction, S ₁/S₂ =0.3 to 0.8 is the ratio of the horizontal projection overlapping length of two adjacent wind-guiding blades of the wind ring to the horizontal projection length of a single wind-guiding blade of the wind ring, and t=10 to 20 (mm) is the thickness of the wind-guiding blade of the wind ring;

18 Height H ₅ (mm):

H₅＝(1.2±0.1)(H₂+H₃) (18)

19 Vertical clearance H ₆ (mm) between the lower edge of the coarse powder overflow hole and the upper edge of the feeding pipe joint:

H₆=300±50 (19)

20 Vertical clearance H ₇ (mm) between the lower edge of the feed back pipe joint and the upper edge of the connecting pipe:

H₇=200±50 (20)

21 Angle theta ₁ (DEG) between the inner ring of the wind ring and the horizontal direction:

θ₁=60±10 (21)

22 Angle theta ₃ (DEG) between the diversion cone and the horizontal direction:

θ₃=60±10 (22)

23 Angle theta ₄ (DEG) between the material lifting table and the horizontal direction:

θ₄=50±5 (23)

24 Angle theta ₅ (DEG) between the coarse material guide cone and the horizontal direction:

θ₅=60±5 (24)

25 Angle theta ₆ (DEG) between the coarse particle sorting shell and the horizontal direction:

θ₆=70±5 (25)

26 Angle theta ₇ (DEG) between the coarse powder guide cone and the horizontal direction:

θ₇=65±10 (26)

27 Under the overflow hole of coarse powder and coarse powder feed back cone bucket the included angle theta ₈ (DEG) between the upper edge connecting line and the horizontal direction is:

θ₈=45±10 (27)

28 The diameter of the lower end of the scattering plate of the annular ladder-shaped scattering device is D ₉(mm)、D₁₀(mm)、D₁₁(mm)、D₁₂ (mm) from top to bottom respectively:

D₁₂＝D₈+(500~600) (29)

29 Adjacent two scattering plate gaps of the annular ladder-shaped scattering device are d ₄(mm)、d₅(mm)、d₆ (mm) from top to bottom respectively:

Wherein, V ₆ = 14 ± 2 is the blowing wind speed (m/s) of the annular "step" shaped scattering device;

30 The diameter of the lower end of the scattering plate of the annular Z-shaped scattering device is D ₁₃(mm)、D₁₄(mm)、D₁₅(mm)、D₁₆ (mm) from top to bottom respectively:

31 Adjacent two scattering plate gaps of the annular Z-shaped scattering device are d ₇(mm)、d₈(mm)、d₉ (mm) from top to bottom respectively:

Wherein V ₇ = 14 ± 2 is the annular "Z" shaped break up device purge wind speed (m/s);

32 The projection overlapping distance of the bus of two adjacent scattering plates of the annular ladder-shaped scattering device is S ₃(mm)、S₄(mm)、S₅ (mm) from top to bottom respectively:

S₃＝S₄＝S₅=150±50 (38)

If S ₃、S₄、S₅ fails to meet the requirement of the formula (38), the calculated value of D ₉、D₁₀、D₁₁ can be properly adjusted;

33 The projection point of the tail end of the upper scattering plate of the annular Z-shaped scattering device on the lower scattering plate is distant from the tail end of the scattering plate, and the projection point is respectively S ₇(mm)、S₈(mm)、S₉ (mm) from top to bottom:

S₇＝S₈＝S₉=150±50 (39)

If S ₇、S₈、S₉ fails to meet the requirement of the formula (39), the calculated value of D ₁₄、D₁₅、D₁₆ can be properly adjusted;

34 Annular step-shaped scattering device and annular Z-shaped scattering device, and the included angle theta ₉ (DEG) between the scattering plates and the horizontal direction is equal to the angle theta ₉ (DEG):

θ₉=45±5 (40)。

The invention has the advantages and positive effects that:

The coarse particle sorting rotating cage is arranged, the coarse particle sorting rotating cage is independently driven to form a forced vortex field, coarse particles can be completely shielded and do not enter a subsequent fine powder grading process, so that coarse, middle and fine gradient grading is achieved, grinding requirements of different equipment in a combined/semi-final grinding system are met, scattered round steel in the coarse particle sorting rotating cage can break cakes formed by extrusion of material bed extrusion equipment, large height difference required by static scattering is shortened, floor height is reduced, civil engineering cost is saved, a distributing disc is arranged below the coarse particle sorting rotating cage, the broken cakes can be evenly scattered to an annular air ring, sedimentation of coarse particles at the annular air ring and lifting of coarse powder and fine powder are facilitated, a diversion cone and the annular air ring are arranged, the air flow field distribution is more uniform, the coarse particle cutting particle size is more definite, the coarse particles brought into a sorting area are reduced, circulation load and material concentration are reduced, equipment resistance is reduced, and circulation fan consumption is reduced. The coarse-fine gradient classifying powder concentrator has a compact structure, solves the problem of uneven airflow and material flow of the traditional V-shaped powder concentrator, realizes accurate classification of coarse particles, medium coarse powder and fine powder, has performance completely superior to that of the traditional V-shaped powder concentrator and the fine dynamic powder concentrator in series connection, and can replace the traditional V-shaped powder concentrator.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of a coarse-fine gradient classifying powder concentrator of the present invention;

FIG. 2 is a view A-A of FIG. 1;

FIG. 3 is a partial detail view of section A of FIG. 1 in accordance with the present invention;

FIG. 4 is a partial detail view of the portion B of FIG. 1 in accordance with the present invention;

FIG. 5 is a partial detail view of section C of FIG. 1 in accordance with the present invention;

FIG. 6 is a schematic view of the structure of the wind distribution area, the pre-break up and coarse particle classification area of the present invention;

FIG. 7 is a view B-B of FIG. 6;

FIG. 8 is a view C-C of FIG. 6;

FIG. 9 is a schematic view of the structure of the coarse particle sorting rotor of the present invention independently driven from the distributing device;

FIG. 10 is a schematic diagram of the structure of the upper and lower independent partitions of the coarse and fine gradient classification powder concentrator of the present invention;

FIG. 11 is a schematic diagram of the structure of the coarse-fine gradient classifying powder concentrator of the present invention introducing dust-containing gas flow in the form of wind sweep;

FIG. 12 is a schematic view of the annular "step" shaped break up device of the present invention;

FIG. 13 is a schematic view of the structure of the annular "Z" shaped scattering device of the present invention;

FIG. 14 is a schematic view of the process parameters of the coarse and fine gradient classification powder concentrator of the present invention;

FIG. 15 is a schematic view of process parameters of the annular "step" shaped breaking device of the present invention;

FIG. 16 is a schematic view of the process parameters of the annular "Z" shaped breaking device of the present invention.

1, Finely grading driving; 2, finely grading the shell; 3, fine powder sorting rotating cages; the coarse powder material is separated by a coarse powder material separating device, which comprises a fixed blade, a stationary blade, a material returning control device, a coarse powder material returning pipe, a fixed blade, a coarse powder material returning pipe, a fine powder material returning pipe, a coarse powder material returning pipe, a fine powder material separating pipe, a coarse powder material returning pipe, a fine powder material separating pipe, a coarse powder material separating pipe, a material returning pipe, a material separating device, a coarse powder material separating pipe, a material returning pipe, a material separating device, a coarse powder material separating pipe, a material separating device, a coarse powder material separating pipe, a material separating box, a material separating the coarse material, a, respectively, respectively, respectively, a, respectively material, the non-standard connection air pipe, a 63 pipe sealing piece, a 64 material scattering inverted cone, a 65 medium coarse powder overflow hole, a 66 medium coarse powder return control valve, a 67 grading device or grinding device, a 68 supporting device, a 69 connecting rib plate, a 70 annular step-shaped scattering device, a 71 scattering plate, a 72 annular Z-shaped scattering device, a 73 material distributing device dynamic seal outer ring, a 74 material distributing device dynamic seal inner ring and a 75 coarse particle sorting shell.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples

Referring to fig. 1 to 13, an embodiment of the present invention provides a coarse-fine gradient classifying powder separator, which sequentially forms a wind distribution region, a pre-scattering and coarse-grain classifying region, a feeding and coarse-grain return material joining region, and a coarse-grain and fine-grain classifying region from bottom to top, wherein the wind distribution region and the pre-scattering and coarse-grain classifying region 10 (a double-stippling coil-out portion) are core portions of the present invention.

The air distribution and distribution area is located at the bottommost part of the equipment and comprises an air inlet shell 27, an air inlet 47, a coarse particle outlet 28, a flow guide cone 36 and an annular air ring 25, wherein the air inlet shell 27 surrounds the bottommost part to form a closed flow guide scattering separation space, the air inlet shell 27 is located on an equipment foundation support 39, the air inlet 47 is located on the side surface of the air inlet shell 27, the air inlet 47 is in a tangential air inlet or vertical air inlet mode, the coarse particle outlet 28 is located at the bottom of the air inlet shell 27, the coarse particle outlet 28 is provided with a plurality of coarse particle outlets, interference with a coarse particle separation drive 42 arranged below is avoided through annular mirror distribution, the flow guide cone 36 is located inside the air inlet shell 27 and is coaxially arranged, and the flow guide cone 36 is in an inverted circular table shape or a cylindrical shape.

The annular wind ring 25 is arranged between the upper outer edge of the guide cone 36 and the top inner edge of the air inlet shell 27, the upper part of the guide cone 36 is closely adjacent to the annular wind ring 25, the outer upper edge of the annular wind ring 25 is close to the lower edge of the material lifting table 34 and closely abuts against the inner wall of the air inlet shell 27, the inner upper edge of the annular wind ring 25 is connected with the upper bearing seat supporting table 26, and the annular wind ring 25 comprises a wind ring inner ring 50, a wind ring outer ring 48 and a plurality of wind ring wind guide blades 49 obliquely arranged between the wind ring inner ring 50 and the wind ring outer ring 48. The lower edge of the wind ring inner ring 50 is fixedly connected with the upper edge of the guide cone 36, and the upper bearing seat supporting platform 26 is fixedly connected with the upper edge of the wind ring inner ring 50.

The gap wind speed of the wind ring wind guide vanes 49 is 18+/-2 m/S, the included angle theta ₂ between the wind ring wind guide vanes 49 and the horizontal direction is 35-45 degrees, and the ratio S ₁:S₂ = 0.3-0.8 of the horizontal projection overlapping length of two adjacent wind ring wind guide vanes 49 and the horizontal projection length of a single wind ring wind guide vane 49.

The upper part of the annular wind ring 25 is a pre-scattering and coarse particle classifying area, the pre-scattering and coarse particle classifying area comprises a coarse particle classifying shell 75, a lifting table 34, a coarse particle classifying rotary cage 51, a distributing device 52 and a coarse particle classifying drive 42, the coarse particle classifying rotary cage 51 is located in the coarse particle classifying shell 75, the coarse particle classifying rotary cage 51 comprises coarse particle classifying blades 21 located around, cage conical tables 31 coaxially arranged in the coarse particle classifying blades 21 and scattering round steel 13 located at the upper part of the inner side of the cage conical tables 31, an upper ring plate 17 is arranged at the top of the coarse particle classifying rotary cage 51, a middle ring plate 20 is arranged in a part, a lower ring plate 22 is arranged at the bottom of the coarse particle classifying rotary cage 51, the coarse particle classifying blades 21 are located between the upper ring plate 17, the middle ring plate 20 and the lower ring plate 22 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 distributed radially, a supporting cover plate 19 is arranged above the coarse particle classifying shell 75 and the coarse particle classifying rotary cage 21, the bottom surface of the supporting cover plate 19 is fixedly connected with the bottom surface of the coarse particle classifying rotary cage 18, and the bottom of the coarse particle classifying rotary cage 19 is connected with the coarse particle classifying rotary cage 18 in a sealing mode. The support cover plate 19 and the coarse particle sorting housing and the coarse particle sorting blade 21 together form a coarse particle sorting area. The scattered round steel 13 is uniformly distributed radially, and the outer surface of the scattered round steel is subjected to wear-resistant treatment.

The material distributing device 52 comprises a material distributing disc frustum 30 and a material distributing disc bottom plate 24, the material distributing disc frustum 30 is coaxially arranged below the cage frustum 31, the outer edge of the bottom end of the material distributing disc frustum 30 is connected with the material distributing disc bottom plate 24, a material flow material distributing channel is formed between the material distributing disc bottom plate 24 and the lower annular plate 22, material distributing round steel 23 is uniformly distributed on one circle of the material flow material distributing channel, the top end of the material distributing round steel 23 is connected with the lower annular plate 22, the bottom end of the material distributing round steel 23 is connected with the material distributing disc bottom plate 24, and the material distributing round steel 23 also connects the material distributing disc bottom plate 24 and the lower annular plate 22 into a whole while distributing materials. If the coarse grain sorting rotating cage 51 and the distributing device 52 are independently driven, the distributing round steel 23 is canceled. The outer edge of the lower side of the distributing disc bottom plate 24 is fixedly connected with a distributing device dynamic seal outer ring 73, a distributing device dynamic seal inner ring 74 is arranged on the wind ring inner ring 50 of the annular wind ring 25, the two form a distributing device dynamic seal together, and the dynamic seal gap of the distributing device dynamic seal is 10-20 mm, so that materials to be sorted are prevented from being discharged out of the system through the wind ring inner ring 50 and the diversion cone 36. Specifically, the dynamic seal inner ring 74 of the distributing device is fixedly connected to the upper edge of the inner ring 50 of the wind ring and abuts against the outer edge of the supporting platform 26 of the upper bearing seat, and the dynamic seal outer ring 73 of the distributing device is fixedly connected to the lower side of the outer edge of the bottom plate 24 of the distributing disc. A material lifting table 34 is arranged between the coarse particle sorting shell and the air inlet shell 27, and the material lifting table 34 is correspondingly positioned on the outer side of the material flow distribution channel and the lower side of the material flow distribution channel is close to the annular air ring 25.

The coarse particle sorting drive 42 is connected with the coarse particle sorting rotary cage 51 and the distribution disc frustum 30 through a shafting I and is used for driving the coarse particle sorting rotary cage 51 and the distribution disc frustum 30 to rotate, and the coarse particle sorting drive 42 is arranged right below the guide cone 36. The bottom end of the diversion cone 36 is connected with a coarse material diversion cone 38, and the diversion cone 36 and the coarse material diversion cone 38 jointly isolate the material flow and the air flow outside a shafting.

The feeding and middling feed back connection area and the middling and fine powder classification area 58 comprise a feeding pipe 8, a middling feed back pipe 6 and a fine classification device, wherein the feeding pipe 8 penetrates through a fine classification shell of the fine classification device to be communicated with the interior of the cage frustum 31, one end of the middling feed back pipe 6 is connected with the lower part of a middling feed back cone 60 of the fine classification device, the other end of the middling feed back pipe penetrates out of the fine classification shell, the middling feed back pipe 6 is uniformly distributed at equal angles, the middling feed back cone 60 is communicated or not communicated with the interior of the cage frustum 31, and the fine classification shell is connected with a supporting cover plate 19 to form a dust-containing airflow ascending channel.

The fine classifying device comprises a fine classifying shell 2, static blades 4, a fine powder classifying rotary cage 3, a middling material returning cone bucket 60 and a fine classifying drive 1, wherein the static blades 4 and the fine powder classifying rotary cage 3 are both positioned on the inner side of the middle part of the fine classifying shell 2, the static blades 4 are concentrically distributed around the outer side of the fine powder classifying rotary cage 3, a fine powder outlet is formed in the fine classifying shell 2 above the fine powder classifying rotary cage 3, the top end of the middling material returning cone bucket 60 is connected with the bottom end of the static blades 4, and the fine classifying drive 1 is connected with the fine powder classifying rotary cage 3 and is positioned on the fine classifying shell 2 above the fine powder outlet.

Specifically, the feeding pipe 8 is located right above the center of the coarse particle sorting rotating cage 51, the feeding pipe 8 is communicated with the inside of the cage frustum 31 through the inner connecting pipe 7, the feeding pipe 8 is inserted into the inner connecting pipe 7 and feeds materials to be sorted into the cage frustum 31 through the inner connecting pipe 7 to be pre-dispersed, the fed material flow is separated from the outside air flow through the inner connecting pipe 7, the fine classification shell is connected with the supporting cover plate 19 through the outer connecting air pipe 9, the lower part of the outer connecting air pipe 9 is connected with the supporting cover plate 19, the upper part of the fine classification shell is connected with the fine classification shell, and a dust-containing air flow ascending channel is formed between the inner connecting pipe 7 and the outer connecting air pipe 9. As shown in fig. 5, the inner seal 16 of the rotating cage is arranged at the position close to the inner connecting pipe 7 along the periphery of the upper outer edge of the cage frustum 31, and is composed of an inner seal ring 16-1 of the rotating cage and an inner connecting pipe 7, the inner seal ring 16-1 of the rotating cage is arranged at the position close to the inner connecting pipe 7 along the periphery of the upper outer edge of the cage frustum 31, the inner seal ring 16-1 of the rotating cage and the inner connecting pipe 7 are matched to form the inner seal 16 of the rotating cage of the coarse particle sorting rotating cage, the dynamic seal gap of the inner seal 16 of the rotating cage is 10-20 mm, coarse powder after sorting and materials to be sorted are prevented from reversely entering each other, and the radial positions of the inner seal ring 16-1 of the rotating cage and the inner connecting pipe 7 are interchangeable.

As shown in fig. 3, a rotating cage outer seal 18 is disposed on a periphery of the bottom surface of the support cover plate 19 near the inner and outer edges of the upper ring plate 17, and is composed of an outer seal outer ring 18-1, an outer seal inner ring 18-2 and the upper ring plate 17, wherein the outer seal outer ring 18-1 is fixedly connected to the bottom surface of the support cover plate 19 and is located at the outer edge of the upper ring plate 17, the outer seal inner ring 18-2 is fixedly connected to the bottom surface of the support cover plate 19 and is located at the inner edge of the upper ring plate 17, the outer seal outer ring 18-1 and the outer seal inner ring 18-2 are matched with the upper ring plate 17 to form the rotating cage outer seal 18, and a dynamic seal gap of the rotating cage outer seal 18 is 10-20 mm, so that coarse particles are prevented from directly passing through the coarse particle sorting rotating cage 51 to enter a subsequent sorting process without sorting. The inner seal 16 and the outer seal 18 are both dynamic seals, so that the coarse particle sorting rotating cage 51 does not interfere and collide during the rotating motion.

As shown in fig. 6, the upper ring plate 17 is connected with the cage frustum 31 through a rotating cage pull rod 12, the arrangement direction of the rotating cage pull rod 12 is consistent with the rotation direction of the coarse particle sorting rotating cage 51 and is uniformly distributed along the axis of the coarse particle sorting rotating cage 51, the inner edge of the lower ring plate 22 is connected with the cage frustum 31, the outer edge of the middle ring plate 20 is connected with the coarse particle grading blade 21, the inner edge of the middle ring plate 20 is connected with the cage frustum 31 through a pull rod or a rib plate, the middle ring plate 20 reinforces and fixes the coarse particle grading blade 21, the upper ring plate 17, the middle ring plate 20 and the lower ring plate 22 are respectively positioned at the upper part, the middle part and the lower part of the coarse particle sorting rotating cage 51, and the upper ring plate 17, the middle ring plate 20, the lower ring plate 22, the rotating cage pull rod 12 and the cage frustum 31 jointly form a cage frame.

As shown in fig. 6, the coarse particle sorting rotating cage 51 and the distribution disc frustum 30 are driven together by the same driving device, at this time, the shafting one comprises a main shaft 41 and a main shaft sleeve 35 sleeved on the main shaft 41, the top of the main shaft 41 is provided with a hub 14, the upper part of the hub 14 is connected with the scattering round steel 13, the lower part of the hub 14 is connected with the distribution disc frustum 30, and the top of the hub 14 is provided with an anti-wear cap 15. Specifically, the upper part of the main shaft 41 is supported by a bearing assembly arranged in the upper bearing seat 11, the lower part of the main shaft is supported by a bearing assembly arranged in the lower bearing seat 37, the upper bearing seat and the lower bearing seat are coaxially arranged, bearing seat supports 32 are arranged around the outer side of the upper bearing seat 11, the bearing seat supports 32 are connected with lug plates 33, the lug plates 33 are connected with an upper bearing seat support table 26 and transmit the radial force to an air inlet shell 27 through the upper bearing seat support table 26 and an annular air ring 25, a support flange 40 is arranged on the outer side of the lower bearing seat 37, the support flange 40 is connected with an equipment foundation support 39 and transmit the axial force to a civil engineering foundation through the equipment foundation support 39, a driving device base 29 is connected below the equipment foundation support 39, a lower coarse particle sorting driving 42 is connected below the driving device base 29, and the lower coarse particle sorting driving 42 is a power source of the whole coarse particle sorting rotating cage 51 and a distribution cone table 30.

In order to further realize the precise coarse particle sorting and optimal material distribution rotating speed requirements, the coarse particle sorting rotating cage 51 and the material distribution disc frustum 30 can be respectively and independently driven, specifically, as shown in fig. 9, the coarse particle sorting rotating cage 51 and the material distribution disc frustum 30 are respectively and independently driven by two drives, at the moment, the coarse particle sorting driving comprises an independent driving one 56 and an independent driving two 57, the shafting one comprises an inner transmission shaft 53 and an outer transmission sleeve shaft 54, the upper end of the inner transmission shaft 53 is connected with the scattered round steel 13 through a hub 14, the lower end of the inner transmission shaft 53 is connected with the independent driving one 56, the independent driving one 56 can be used for variable frequency speed regulation, the outer transmission sleeve shaft 54 is sleeved on the inner transmission shaft 53, the upper end of the outer transmission sleeve shaft 54 is connected with the material distribution disc frustum 30, the lower end of the outer transmission sleeve shaft 54 is connected with the independent driving two 57 through a belt pulley group 55, and the independent driving two 57 can be used for variable frequency speed regulation. Specifically, the inner transmission shaft 53 is supported by its matched upper and lower bearings or upper, middle and lower bearing assemblies, wherein the upper bearing assembly can be positioned at the upper part of the bearing seat 11 of the material distribution disc frustum 30 or can be positioned inside the bearing seat 11 of the material distribution disc frustum 30, and the outer transmission sleeve shaft 54 is supported by its matched upper and lower bearings or upper, middle and lower bearing assemblies, and the upper bearing assembly is positioned inside the bearing seat 11 of the material distribution disc frustum 30. The coarse particle sorting rotating cage 51 and the material distribution disc frustum 30 can realize independent and adjustable rotating speeds according to different requirements of material distribution and sorting on the rotating speeds, and the whole equipment is in a three-drive mode.

As shown in fig. 11, to further achieve a greater number of stages of classification or ultra-fine classification, a dusty gas stream may be introduced in series with classification or grinding equipment 67 in the form of a wind sweep. Specifically, the air inlet 47 is connected to a classifying device (such as a static powder separator) or a grinding device (such as a wind mill), and introduces the dust-containing air flow to be separated into the air inlet housing 27 in a wind sweeping manner.

As shown in fig. 1, when the middling feed back cone hopper 60 is communicated with the interior of the cage cone table 31, a feed back control device 5 is disposed in the middling feed back cone hopper 60, the feed back control device 5 comprises a middling guide cone 46, and a middling overflow hole 65 is disposed on the middling guide cone 46, so that the feed back control device 5 is communicated with the interior of the cage cone table 31.

An annular area for collecting coarse powder is formed between the coarse powder guide cone 46 and the coarse powder return cone hopper 60, a plurality of separating cones 45 are uniformly distributed in the annular area along the circumferential direction, the separating cones 45 are formed by two plates which are lapped together to form a ridge shape, the annular area is divided into a plurality of funnel-shaped material areas by the separating cones 45 together with the coarse powder guide cone 46 positioned in the center, a return pipe interface 44 is arranged at the bottom of each funnel-shaped material area, the return pipe interface 44 is in a large upper part and a small lower part, the accumulation of materials can be completely avoided, the lower end of the return pipe interface 44 is connected with a return chute 43, the lower end of the return chute 43 is connected with a coarse powder return pipe 6, the return chute 43 and the coarse powder return pipe 6 are connected through bolts, the coarse powder return position and the angle are adjusted according to the material flow direction required by the process, a coarse powder return control valve 66 is arranged on the coarse powder return pipe 6, and coarse powder secondary classification of coarse powder is realized by adjusting the opening degree of the coarse powder return control valve 66 through the coarse powder return hole 65 on the coarse powder guide cone 46.

As shown in fig. 10, in order to further realize the flexible arrangement requirements of the coarse particle sorting part, the coarse powder sorting part and the fine powder sorting part, specifically, the wind distribution and distribution area and the pre-scattering and coarse particle classifying area 10 and the feeding and coarse powder return material joining area and the coarse powder and fine powder classifying area 58 can be independently and separately used as independent two parts, and are arranged at different heights according to the process requirements, at this time, the coarse powder return cone 60 is not communicated with the inside of the cage cone 31, and the external connecting air pipe 9 is replaced by a nonstandard connecting air pipe 62. The air distribution and distribution area and the pre-scattering and coarse particle classifying area 10 are positioned at the bottom and connected with the coarse powder and fine powder classifying area 58 through a non-standard connecting air pipe 62, the coarse powder and fine powder classifying area 58 is fixed with a platform with a process elevation through a support 59, a feeding pipe 8 is inserted into the non-standard connecting air pipe 62 and extends to the central axis and then is connected with a vertically downward built-in pipe 61, the built-in pipe 61 extends downwards to the interior of the internal connecting pipe 7 and is sealed with the internal connecting pipe 7 through a pipe sealing piece 63, and an inverted cone-shaped material scattering inverted cone 64 is arranged right below the built-in pipe 61 and in the internal connecting pipe 7 so as to uniformly distribute materials entering the interior of the cage frustum 31 and reduce impact of high-speed material flow caused by height difference on the coarse particle sorting rotating cage 51.

In addition, the feeding pipe 8 at the feeding position of the coarse-fine gradient classifying powder separator can be omitted, replaced by being connected with other static classifying equipment or grinding equipment in series, and dust-containing airflow is introduced in a wind sweeping mode so as to complete classification of more stages.

To further improve the classification clarity of the coarse and fine particles, specifically, an annular "step" type scattering device 70 (see fig. 12) or an annular "Z" type scattering device 72 (see fig. 13) is disposed below the annular air ring 25 and in the inner cavity of the air inlet housing 27. The scattering plates 71 of the annular step-shaped scattering device 70 are all supported on the inner wall of the air inlet shell 27 through the supporting device 68 and are arranged in a step-shaped structure overlapped at a certain interval, and two adjacent scattering plates 71 are connected through the connecting rib plate 69. The scattering plates 71 of the annular Z-shaped scattering device 72 are partially supported on the inner wall of the air inlet shell 27 through the supporting device 68, partially supported on the outer wall of the guide cone 36 through the supporting device 68, the scattering plates 71 on two sides are respectively arranged in a stepped structure overlapped at a certain interval, and scattering classification channels are formed between two adjacent scattering plates 71 and correspond to each other. The working principle is that the materials falling through the annular air ring 25 fall to the annular ladder-shaped scattering device 70 or the annular Z-shaped scattering device 72 at a certain falling speed under the action of gravity, are scattered after being impacted by the scattering plates 71 corresponding to each other, are then blasted by ascending air flow between the scattering plates 71, small particles upwards pass through the annular air ring 25 to enter a coarse particle sorting area for sorting again, and large particles downwards leave the powder concentrator through the coarse particle outlet 28 to enter a coarse particle collecting bin and are ground again by a grinding host (a roller press, a vertical mill and the like).

The grading method of the coarse-fine gradient grading powder concentrator comprises the following working processes:

The material to be sorted is fed into a pre-scattering and coarse particle classifying area in the equipment through a feeding pipe 8 of a feeding and coarse powder return material connecting area, is scattered onto scattering round steel 13 in a coarse particle sorting rotating cage 51 under the action of an anti-abrasion cap 15, the scattering round steel 13 fully scatters cakes contained in the material, after the scattering round steel 13 is fully scattered, a material distribution is completed through a material distribution disc conical table 30 and a material distribution disc bottom plate 24 which are rotated on the lower side and uniformly scattered onto a material lifting table 34, and then falls down to a ring-shaped air ring 25 of a wind distribution area with a certain kinetic energy under the action of gravity, and then impacts the air ring air guide blades under the action of falling kinetic energy and inertia, and the overlapped air ring air guide blades 49 fully scatter again, so that fine particles (coarse powder and fine powder) mixed between bulk material flows and fine powder adhered to the surface of coarse particles are fully scattered and separated; the sorting air flow enters from the air inlet 47 at the lower side of the air distribution area, is uniformly distributed under the combined action of the guide cone 38, the guide cone 36 and the air inlet shell 27, then enters the annular air ring 25, intensively blasts the materials scattered by the air guide blades of the air ring at high speed to finish the first coarse particle classification, most of coarse particles return to the material bed extrusion equipment through the coarse particle outlet 28 under the action of gravity to continue grinding, and small part of coarse particles, most of middlings and fine powder upwards pass through the annular air ring 25 along with the sorting air flow to enter the coarse particle sorting rotating cage 51 to finish the second coarse particle classification, the coarse particle sorting rotating cage 51 rotates to form a forced vortex field, therefore, coarse particles can be more accurately controlled not to pass through the coarse particle classifying blades 21 to enter a subsequent classifying process, dust-containing air flow after separation (passing through the coarse particle classifying blades 21) upwards enters a subsequent coarse powder and fine powder classifying area 58 along a dust-containing air flow ascending channel between the inner connecting material pipe 7 and the outer connecting air pipe 9, fine classification of coarse powder and fine powder is completed on the dust-containing air flow passing through the stationary blades 4 through a fine classifying device (guiding through the stationary blades 4 and rotating through the fine powder separating rotating cage 3), wherein the separated fine powder is collected as a finished product, the coarse powder is further ground by entering a fine grinding device through a return material control device 5, a coarse powder return material control valve 66 and a coarse powder return material pipe 6, or the coarse powder is secondarily separated by adjusting the opening of the coarse powder return material control valve 66, and partial coarse powder is returned to the lower pre-grinding and coarse particle classifying area through a coarse powder overflow hole 65, firstly, the problem that fine powder and fine powder in coarse powder is not timely separated due to insufficient separation clarity in the upper fine powder classifying area is solved, and secondly, fine powder selecting efficiency is improved, fine powder efficiency is improved, a combined/semi-coarse powder grinding and final grinding system is improved, a power balance and a grinding system is lowered, and a grinding system is lowered.

The process structure parameters of the invention are shown in fig. 14-16, and in order to facilitate the description of the design method of the invention, the following main process structure parameters are set:

the system design output P (t/H), the material volume weight rho _s(t/m³), the material flow velocity V _s (m/s), the material filling rate epsilon=0.5-0.8, the system circulation load k, the powder selecting concentration C _s(g/m³), the feeding concentration F _s(kg/m³), the system powder selecting air quantity Q (m ³/H), the diameter D ₁ (mm) of the coarse particle selecting rotating cage 51, the height H ₁ (mm) of the coarse particle selecting rotating cage 51, the diameter aspect ratio D/H of the coarse particle selecting rotating cage 51, the outer diameter D ₂ (mm) of the distributing disc bottom plate 24, the diameter D ₃ (mm) of the outer connecting air pipe 9, the diameter D ₄ (mm) of the inner connecting pipe 7, the diameter D ₅ (mm) at the upper end of the inner cavity of the coarse particle selecting shell, the diameter D ₆ (mm) of the inner ring 50 (mm) of the air ring, the diameter of the outer ring 48 of the air ring or the inner diameter D ₇ (mm) of the air inlet shell 27, the diameter D ₈ (mm) of the interface of the guide cone 36 and the coarse material guide cone, the gap H ₂ (mm) between the lower ring plate 22 and the bottom plate 24 of the distributing plate, the gap H ₃ (mm) between the bottom plate 24 of the distributing plate and the outlet of the annular air ring 25, the height H ₄ (mm) of the annular air ring 25, the height H ₅ (mm) of the material lifting platform 34, the vertical clearance H ₆ (mm) between the lower edge of the middling overflow hole 65 and the upper edge of the material returning pipe joint 44, the vertical clearance H ₇ (mm) between the lower edge of the material returning pipe joint 44 and the upper edge of the inner connecting pipe 7, the diameter D ₂ (mm) of the middling material returning pipe 6, the number n ₁ (number) of the middling material returning pipes 6, the diameter d ₃ (mm) of the middling overflow holes 65, the number n ₂ (number) of the middling overflow holes 65, the included angle theta ₁ (°) between the inner ring 50 and the horizontal direction, the number n ₃ (number) of the wind ring wind guiding blades 49, the thickness t (mm) of the wind ring wind guiding blades 49, the included angle theta ₂ (°) between the wind ring wind guiding blades 49 and the horizontal direction, the included angle theta ₃ (°) between the guide cone 36 and the horizontal direction, the included angle theta ₄ (°) between the material lifting platform 34 and the horizontal direction, the included angle theta ₅ (°) between the guide cone and the horizontal direction, the included angle theta ₆ (°) between the coarse particle sorting shell and the horizontal direction, the included angle theta ₇ (°) between the lower edge of the middling overflow holes 65 and the upper edge of the middling feed back cone 60 are connected with the upper edge of the middling feed back cone ₈ (°), the outlet wind speed V ₁ (m/s) of the coarse-particle sorting rotating cage 51, the radial wind speed V ₂ (m/s) of the coarse-particle sorting rotating cage 51, The outlet wind speed V ₃ (m/S) of the annular wind ring 25, the gap wind speed V ₄ (m/S) of the wind guiding blades 49 of the wind ring (the effective wind speed of the annular wind ring 25), the wind inlet 47 lifts the wind speed V ₅ (m/S), the blowing wind speed V ₆ (m/S) of the annular step-shaped scattering device, the blowing wind speed V ₇ (m/S) of the annular Z-shaped scattering device, the gap D ₁ (mm) of the adjacent two wind guiding blades 49 of the wind ring, the horizontal projection length S ₂ (mm) of the wind guiding blades 49 of the wind ring, the horizontal projection overlapping length S ₁ (mm) of the adjacent two wind guiding blades 49 of the wind ring, the gap D ₄(mm)、d₅(mm)、d₆ (mm) of the adjacent two scattering plates of the annular step-shaped scattering device, the diameter D ₉(mm)、D₁₀(mm)、D₁₁(mm)、D₁₂ (mm) of the lower end of the scattering plates of the annular step-shaped scattering device (38 mm) of the scattering plates of the annular step-shaped scattering device from top to bottom), the projection overlapping distance S ₃(mm)、S₄(mm)、S₅ (mm) of the bus bar projection overlapping distance S ₃(mm)、S₄(mm)、S₅ (38 mm) of the adjacent two scattering plates of the annular step-shaped scattering device from top to bottom of the scattering plates of the annular step-shaped scattering device (38 mm) of the scattering plates from top to bottom), the included angle theta ₉ (DEG) between each scattering plate of the annular ladder-shaped scattering device and the annular Z-shaped scattering device and the horizontal direction.

The main process parameter calculation steps are as follows:

1) System powder selection air quantity Q (m ³/h):

2) Coarse particle sorting rotor diameter D ₁ (mm):

Wherein D/h=1.8-2.0 is the coarse particle sorting rotor diameter-to-height ratio, V ₂ =1.5-2.5 is the coarse particle sorting rotor radial wind speed (m/s);

3) Coarse particle sorting rotor height H ₁ (mm):

D₂＝D₁-(0~50) (4)

5) Wind ring inner diameter D ₆ (mm):

D₆＝D₂-(40~60) (5)

Wherein V ₃ = 10 ± 2 is the annular wind ring outlet wind speed (m/s);

wherein, V ₅ = 4 + -1 is the lifting wind speed (m/s) of the air inlet;

8) Coarse particle sorting shell inner cavity upper end diameter D ₅ (mm):

9) Inner connecting tube diameter D ₄ (mm):

Wherein, the system circulation load k=3±1, the material volume weight ρ _s＝1.5～1.8(t/m³), the material flow velocity V _s =1±0.5 (m/s), the material filling rate epsilon=0.5 to 0.8;

10 External connection air pipe diameter D ₃ (mm):

n₁＝n₂=3±1 (11)

12 Coarse powder feed back tube diameter d ₂ (mm):

13 Coarse powder overflow aperture diameter d ₃ (mm):

d₃＝d₂ (13)

H₂=300±50(mm) (14)

H₃=100±50(mm) (15)

16 Number n ₃ (number of) wind guide blades of the wind ring:

17 Annular wind ring height H ₄ (mm):

wherein θ ₂ =40±5 is the included angle (degree) of the wind guiding blades of the wind ring and the horizontal direction, S ₁/S₂ =0.3 to 0.8 is the ratio of the horizontal projection overlapping length of two adjacent wind guiding blades of the wind ring to the horizontal projection length of a single wind guiding blade of the wind ring, and t=10 to 20 is the thickness (mm) of the wind guiding blade of the wind ring;

18 Height H ₅ (mm):

H₅＝(1.2±0.1)(H₂+H₃) (18)

H₆=300±50 (19)

H₇=200±50 (20)

θ₁=60±10 (21)

θ₃=60±10 (22)

θ₄=50±5 (23)

θ₅=60±5 (24)

θ₆=70±5 (25)

θ₇=65±10 (26)

θ₈=45±10 (27)

D₁₂＝D₈+(500~600) (29)

S₃＝S₄＝S₅=150±50 (38)

S₇＝S₈＝S₉=150±50 (39)

θ₉=45±5 (40)。

In order to verify the technical effect of the invention, the invention designs a semi-industrial combined grinding test system based on TRP phi 400x100 mm-phi 750x2500mm, wherein the air quantity of the powder selected by the system is 4000m ³/h, the specification Cphi 300 x 550-Fphi 300-570mm thick and thin gradient classification powder concentrator, the comparative test research of 40 groups of grinding PO425 cement is carried out on the original V-shaped powder concentrator of the system under the condition of basically the same working condition, and the test statistical data result is shown in table 1.

TABLE 1 comparison of the powder concentrator of the invention with conventional V-concentrator

According to the data shown in Table 1, compared with the traditional V selection technology, the powder selection efficiency of the invention is greatly reduced under the condition of basically the same working condition, the powder selection efficiency of the particles with the particle size of more than 0.2mm is reduced by 35.4 percent, and the powder selection efficiency of the fine particles with the particle size of less than or equal to 0.2mm is improved by 20.9 percent. The powder selecting efficiency of coarse particles is reduced, more coarse particles return to the powder grinding equipment, the powder selecting efficiency of small particles smaller than or equal to 0.2mm is increased, more finished particles leave the powder grinding equipment, and the powder is not returned to the powder grinding equipment for grinding again, so that the stability of a material layer is damaged, and the grinding efficiency is reduced. Therefore, the powder selecting definition of the invention is greatly improved, the common problem of unclear selection of coarse, fine, middle and coarse in the traditional V selection is solved, and the expected purpose is achieved.

According to the test statistical data in Table 1, in the aspect of system performance synergy, the system stage time is increased from 1.51t/h to 1.78t/h, the amplification is 17.8%, the specific surface area of the finished product is increased from 3183cm ²/g to 3472cm ²/g, the amplification is 7.6%, and the quality of the finished product is remarkably improved. In the aspect of the output of a main machine, the powder selecting performance of 'the powder selecting efficiency of particles with the particle diameter of more than 0.2mm is greatly reduced, the powder selecting efficiency of small particles with the particle diameter of less than or equal to 0.2mm is increased', the fine powder in the materials of the heavy-return roller press is greatly reduced, the stability of the material layer is improved, the absorption power of the roller press is increased from 17.9kW to 21.4kW, the amplitude is increased by 19.6%, the output of the main machine is obviously increased, and important guarantee is provided for improving the production and reducing the consumption. In the aspect of power consumption of a host, although the amplitude reduction of the nominal power consumption is not obvious, the equivalent weight can be reduced to 18.3kWh/t from 21.1kWh/t under the condition of being converted into the same 3200cm ²/g specific surface area, and the amplitude reduction is 13.2%.

In conclusion, compared with the traditional V-selection technology, the invention has obvious effects of improving yield and reducing consumption.

It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A coarse and fine gradient classifier, characterized in that: the coarse and fine gradient classifier is formed from bottom to top as a sequentially connected air distribution and material distribution zone, a pre-dispersion and coarse particle classification zone, a feeding and medium-coarse powder return connection zone, and a medium-coarse powder and fine powder classification zone.

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

The pre-dispersing and coarse particle classification zone includes a coarse particle sorting shell, a coarse particle sorting rotating cage, a feeding device, and a coarse particle sorting drive. The coarse particle sorting rotating cage is located inside the coarse particle sorting shell. The coarse particle sorting rotating cage includes coarse particle classification blades located around the perimeter, 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;

The material distribution device includes a material distribution disc cone and a material distribution disc base plate. The material distribution disc cone is coaxially arranged below the cage cone. 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. A lifting platform is provided between the coarse particle sorting shell and the air inlet shell. The lifting platform is located on the outside of the material flow distribution channel and its lower side is adjacent to the annular air ring. The material distribution disc base plate and the inner ring of the annular air ring are connected by a dynamic seal to form a dynamic seal of the material distribution device.

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

The feeding and coarse powder return connection area and the coarse and fine powder classification area include a feeding pipe, a coarse powder return pipe, and a fine classification device. The feeding pipe passes through the fine classification shell of the fine classification device and is connected to the inside of the cage cone through an internal connecting pipe. The internal connecting pipe and the cage cone are connected by a dynamic seal, forming the inner seal of the coarse particle sorting drum. One end of the coarse powder return pipe is connected to the coarse powder return cone of the fine classification device, and the other end passes through the fine classification shell. The coarse powder return cone may or may not be connected to the inside of the cage cone. The fine classification shell is connected to the support cover plate to form a dust-laden airflow rising channel.

2. The coarse and fine gradient classifier according to claim 1, wherein the feeding pipe is located directly above the center of the coarse particle sorting drum, and the fine grading shell is connected to the support cover plate through an external connecting air duct;

A rotating cage inner sealing ring is provided around the outer edge of the cage cone near the inner connecting material pipe. The rotating cage inner sealing ring and the inner connecting material pipe cooperate to form the rotating cage inner seal of the coarse particle sorting rotating cage. 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 inner connecting material pipe can be interchanged.

The bottom surface of the support cover plate is fixedly connected to an outer sealing ring located on the outside of the upper ring plate and an inner sealing ring located on the inside 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 dynamic sealing gap of the rotating cage outer seal is 10~20mm.

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 cooperate to form the dynamic seal of the fabric device. The dynamic sealing gap of the dynamic seal of the fabric device is 10~20mm.

3. The coarse-fine gradient classifier according to claim 1, characterized in that the upper ring plate is connected to the cage cone via a rotating cage tie rod, the arrangement direction of the rotating cage tie rod is consistent with the rotation direction of the coarse particle sorting rotating cage and is evenly distributed along the axis of the coarse particle sorting rotating cage; the inner edge of the lower ring plate is connected to the cage cone; the inner edge of the middle ring plate is connected to the cage cone via a tie rod or a reinforcing rib.

4. The coarse and fine gradient classifier according to claim 1, characterized in that the feeding pipe at the feeding point of the coarse and fine gradient classifier is cancelled and replaced by being connected in series with other static sorting equipment or grinding equipment, and the dust-laden airflow is introduced in the form of wind sweeping.

5. The coarse and fine gradient classifier according to claim 1, characterized in that the coarse particle sorting drum and the feeding disc cone are driven by the same drive, and the shaft system includes a main shaft and a main shaft sleeve sleeved on the main shaft. A hub is provided at 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 disc cone. An anti-wear cap is provided at the top of the hub.

6. The coarse-fine gradient classifier according to claim 1, characterized in that the coarse particle sorting drum and the feeding disc cone are driven independently by two drives, wherein 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 disc cone, and the lower end is connected to the independent drive two through a pulley set.

7. The coarse and fine gradient classifier according to claim 1, characterized in that the air distribution and material distribution area and the pre-dispersing and coarse particle classification area and the feeding and medium-coarse powder return connection area and the medium-coarse powder and fine powder classification area can be used independently as two separate parts, arranged at different heights according to process requirements. At this time, the medium-coarse powder return cone and the cage cone are not connected, and the external connecting air duct is replaced with a non-standard connecting air duct. The air distribution and material distribution area and the pre-dispersing and coarse particle classification area are connected to the medium-coarse powder and fine powder classification area through the non-standard connecting air duct.

8. The coarse and fine gradient classifier according to claim 1, wherein the air inlet is connected to a classifying device or a grinding device, and the dust-laden airflow to be classified is introduced into the air inlet housing in a wind sweeping manner.

9. The coarse and fine gradient classifier according to claim 1, characterized in that 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 shell;

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 are connected by connecting ribs.

The dispersing plates of the annular "Z"-shaped dispersing device are partially supported on the inner wall of the air inlet housing by a support device, and partially supported on the outer wall of the guide cone by a support device. The dispersing plates on both sides are arranged in a stepped structure with a certain spacing. A dispersing and grading channel is formed between two adjacent dispersing plates on both sides, corresponding to each other. The distance 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 100-200 mm. The angle θ9 between the dispersing plates of the annular "stepped" dispersing device and the annular " _Z "-shaped dispersing device and the horizontal direction is 40-50°.

10. The coarse and fine gradient classifier according to claim 1, characterized in that the annular air ring includes an inner air ring, an outer air ring, and several air ring guide vanes inclinedly disposed between the inner and outer air rings; the gap velocity of the air ring guide vanes is 18±2 m/s; the _angle θ2 between the air ring guide vanes and the horizontal direction is 35 to 45°; the ratio _S1 : _S2 of the horizontal projection overlap length of two adjacent air ring guide vanes to the horizontal projection length of a single air ring guide vane is 0.3 to 0.8.

11. The coarse and fine gradient classifier according to claim 1, characterized in that, when the coarse particle sorting drum and the material distribution device are driven by the same drive, the material flow distribution channel is evenly distributed with material distribution round steel bars, the top end of the material distribution 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.

12. The coarse and fine gradient classifier according to claim 1, wherein the bottom end of the guide cone is connected to a coarse material guide cone.

13. The coarse and fine gradient classifier according to claim 1, characterized in that, when the coarse powder return cone is connected to the inside of the cage cone, a return control device is provided inside the coarse powder return cone, the return control device includes a coarse powder guide cone, the coarse powder guide cone is provided with a coarse powder overflow hole, so that the return control device is connected to the inside of the cage cone; an annular area for collecting coarse powder is formed between the coarse powder guide cone and the coarse powder return cone, and several distribution cones are evenly distributed along the circumference of the annular area, the distribution cone is two plates stacked together in a ridge shape, the distribution cone and the coarse powder guide cone located in the center divide the annular area into several funnel-shaped material areas, each funnel-shaped material area is provided with a return pipe interface at the bottom, the return pipe interface is funnel-shaped with a larger top and a smaller bottom, the lower end of the return pipe interface is connected to the coarse powder return pipe, and a coarse powder return control valve is provided on the coarse powder return pipe.

14. A classification method for a coarse-fine gradient classifier according to any one of claims 1 to 13, characterized in that the material to be classified is fed into the pre-dispersing and coarse particle classification zone inside the equipment through the feeding pipe of the feeding and medium-coarse powder return connection zone, dispersed onto the dispersing round steel inside the coarse particle classification drum, and after being fully dispersed by the dispersing round steel, the material is distributed and evenly thrown onto the lifting platform by the lower rotating material distribution disc cone and the bottom plate of the material distribution disc, and then falls onto the annular air ring in the air distribution zone, where it impacts the air ring guide vanes and is further fully dispersed by the air ring guide vanes, so that the fine particles mixed in the material flow and the fine powder adhering to the surface of the coarse particles are fully dispersed and detached; the classification airflow enters through the air inlet and is evenly distributed, and then enters the annular air ring, where it concentrates and blows at high speed the material dispersed by the air ring guide vanes, thus completing the classification process. The first coarse particle classification is performed. Most of the coarse particles return to the material bed extrusion equipment for further grinding under gravity. A small portion of coarse particles, most of the medium-coarse powder and fine powder are carried upward by the sorting airflow through the annular air ring and enter the coarse particle sorting drum to complete the second coarse and fine particle classification. The dust-laden airflow after sorting enters the subsequent medium-coarse and fine powder classification zone along the dust-laden airflow rising channel. The fine classification device completes the fine classification of medium-coarse and fine powders by the dust-laden airflow passing through the stationary blades. The sorted fine powder is collected as finished product, while the medium-coarse powder enters the fine grinding equipment for further grinding through the return material control device, the medium-coarse powder return material control valve and the medium-coarse powder return pipe. Alternatively, the medium-coarse powder can be returned to the lower pre-dispersing and coarse particle classification zone for secondary sorting by adjusting the opening of the medium-coarse powder return material control valve through the medium-coarse powder overflow hole.