CN111644237B - External grading grinding system and method for fine powder low-content powdery raw material vertical mill - Google Patents

External grading grinding system and method for fine powder low-content powdery raw material vertical mill Download PDF

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Publication number
CN111644237B
CN111644237B CN202010646218.XA CN202010646218A CN111644237B CN 111644237 B CN111644237 B CN 111644237B CN 202010646218 A CN202010646218 A CN 202010646218A CN 111644237 B CN111644237 B CN 111644237B
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China
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communicated
machine
air inlet
disperser
main machine
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CN202010646218.XA
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CN111644237A (en
Inventor
陆全旗
容栋国
李庆会
吴鑫
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Guilin Hongcheng Mining Equipment Manufacture Co
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Guilin Hongcheng Mining Equipment Manufacture Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/30—Passing gas through crushing or disintegrating zone the applied gas acting to effect material separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The utility model discloses an external grading grinding system and method of a fine powder low-content powdery raw material vertical mill, wherein a grinding host machine comprises a grinding disc device and a grinding roller device in a main machine cover cylinder, a disperser is arranged on the main machine cover cylinder, and an air inlet, a water inlet and a main machine discharge hole are formed on the main machine cover cylinder; the feeding unit comprises a raw material bin and a lifting machine, wherein the raw material bin is communicated with the lifting machine through a conveying metering scale, the lifting machine is communicated with the disperser through a feeding screw machine, and a main machine discharge port is communicated with the lifting machine through a return screw machine; the main machine external classification unit comprises a classifier and a volute type air inlet device, wherein the classifier is communicated with the volute type air inlet device through a hopper, the volute type air inlet device is communicated with the disperser through an air powder pipe, and the disperser is communicated with the disperser through a return screw; the dust collection induced air unit comprises a pulse dust collector and an induced draft fan, wherein the pulse dust collector is communicated with the classifier, and the induced draft fan is communicated with the pulse dust collector. The utility model reduces the overgrinding of fine powder in raw materials, improves the productivity and reduces the energy consumption.

Description

External grading grinding system and method for fine powder low-content powdery raw material vertical mill
Technical Field
The utility model relates to a powder processing technology, in particular to an external grading grinding system and method of a fine powder low-content powdery raw material vertical mill.
Background
In the traditional grinding process of the vertical mill, the feeding mode is that a powdery raw material (such as fly ash) is fed into the mill through a feeder and falls on a millstone to be directly ground, and a fine powder part reaching the fineness requirement and a particle part not reaching the requirement in the powdery raw material are mixed together to be ground.
Research shows that when the vertical mill grinds the powdery raw material, when the content of the fine powder reaching the fineness requirement in the powdery raw material is more than 30%, the grinding of the fine powder reaching the fineness requirement is superfluous, and the excessive content of the fine powder in the powdery raw material is unfavorable for the formation and stabilization of a material layer of the vertical mill, so that equipment vibrates, and energy waste and equipment damage are caused.
In order to reduce the accumulation of powdery raw materials on a millstone and avoid transitional grinding, the utility model with the authorized bulletin No. CN205833268U provides a vertical external circulation pulverizer, which is characterized in that the powdery raw materials in a main machine of the vertical mill are timely guided out and sorted by a classifier arranged outside the main machine of the vertical mill, qualified fine powder is collected by a dust collector, and unqualified powder is guided into the main machine of the vertical mill to participate in grinding again.
Because the supplied powdery raw materials are mixed with fine powder and coarse powder, the ratio of the powder raw materials is different, and the vertical external circulation pulverizer adopts the same indiscriminate pulverizing system and process for the powdery raw materials with low content of fine powder and the powdery raw materials with high content of fine powder, only partially solves the problem of transitional grinding.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide an external grading grinding system and method of a vertical mill corresponding to fine powder low-content powdery raw materials.
The technical scheme of the external grading grinding system of the fine powder low-content powdery raw material vertical mill capable of solving the problems in the prior art comprises a vertical mill main machine, a feeding unit, an external grading unit of the main machine and a dust collection and air introduction unit, and is characterized in that:
1. the mill main machine comprises a mill disc device and a mill roller device which are arranged in a main machine cover cylinder, wherein the mill disc of the mill disc device is arranged on a base and driven to rotate by a speed reducer, the circumference of the mill roller device is uniformly distributed and rolled on the mill surface of the mill disc under the action of a pressurizing mechanism which is correspondingly arranged, a disperser is arranged at the top of the main machine cover cylinder, an air inlet and a water inlet are uniformly distributed at the circumference of the lower part of the main machine cover cylinder, and a main machine discharge hole is formed in the bottom of the main machine cover cylinder.
2. The feeding unit comprises a raw material bin and a lifting machine, wherein the raw material bin is communicated with a feed inlet of the lifting machine through a conveying metering scale, a discharge outlet of the lifting machine is communicated with a feed inlet at the side part of the disperser through a feeding screw machine, a discharge outlet at the bottom of the disperser is positioned above the center of the millstone, and a discharge outlet of the main machine is communicated with the feed inlet of the lifting machine through a return screw machine.
3. The main engine external grading unit comprises a grading machine and a volute type air inlet device, the grading machine is communicated with the volute type air inlet device through a hopper, the volute type air inlet device is communicated with an air outlet at the top of the disperser through an air powder pipe, and a discharge hole of the volute type air inlet device is communicated with a discharge hole of the disperser through a return screw machine which enters the main engine cover barrel.
4. The dust collection induced air unit comprises a pulse dust collector and an induced draft fan, wherein a feed inlet of the pulse dust collector is communicated with a qualified powder discharge outlet of the classifier, and an air inlet of the induced draft fan is communicated with an air outlet of the pulse dust collector.
The dispersing device comprises a dispersing cylinder coaxially arranged at the top of a main machine cover cylinder and an ash bucket coaxially arranged in the main machine cover cylinder below the dispersing cylinder and positioned above a millstone, wherein a dispersing rotary table positioned below a discharge hole of a feeding screw machine is coaxially arranged in the dispersing cylinder, and the dispersing rotary table is connected with a dispersing motor through a bevel gear transmission pair and a belt pulley transmission pair.
In one structure of the volute type air inlet device, an air inlet barrel of the volute type air inlet device is communicated with a hopper through an involute type air inlet cover, an air powder pipe penetrates through a barrel body of the air inlet barrel, the upper end of the air powder pipe is coaxially arranged at the communicating position of the involute type air inlet cover and the hopper, and the lower end of the air powder pipe is communicated with an air outlet of the disperser.
Conventionally, a muffler is installed at an air outlet of the induced draft fan to reduce noise.
The grinding process flow of the external grading grinding system of the vertical mill adopting the powdery raw materials with low content of fine powder is as follows:
1. and starting the induced draft fan.
2. The fine powder low-content powdery raw materials in the raw material bin are quantitatively fed into a lifting machine through a conveying metering scale, and the lifting machine lifts the raw materials and then feeds the raw materials into a disperser through a feeding screw machine.
3. In the disperser, the raw materials are scattered around and lifted by upward wind, coarser raw materials are concentrated in the center of the millstone, are thrown to the milling surface (milling area) of the millstone under the action of centrifugal force and are milled by the milling roller after water is added, and the raw materials are lifted again by wind in the milling process.
4. The finer raw materials enter a classifier under the action of wind power, qualified powder after separation enters a pulse dust collector to be collected, and the wind filtered by the pulse dust collector is discharged into the atmosphere through a draught fan.
5. The unsorted powder is raised again by the wind power (active air intake) of the spiral case type air intake device, and the qualified powder contained in the unsorted powder is sorted by the classifier and enters the pulse dust collector.
6. The disqualified sorting return materials are sent into a disperser through a return screw machine and fall into a millstone to be ground again.
7. The blanking at the bottom of the main hood cylinder is returned to the lifting machine through the return screw machine and is ground together with the new raw material.
The utility model has the beneficial effects that:
the external grading grinding system and method for the powdery raw materials with low fine powder content can sort the fine powder part reaching the fineness requirement before grinding the raw materials, and grind the rest coarse particles, so that the problem of overgrinding of the fine powder part reaching the fineness requirement in the raw materials is thoroughly solved, the productivity is improved, the energy consumption is reduced, and the running stability of the system is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Fig. 2 is a schematic view of the structure of the neutral grinding machine in the embodiment of fig. 1.
Fig. 3 is a schematic diagram of the external hierarchical unit of the host in the embodiment of fig. 1.
Drawing number identification: 1. a main machine of the vertical mill; 1-1, a host cover cylinder; 1-2, grinding disc; 1-3, a speed reducer; 1-4, grinding rolls; 1-5, a pressurizing mechanism; 2. a disperser; 2-1, a dispersing cylinder; 2-2, ash bucket; 2-3, a dispersion turntable; 2-4, bevel gear transmission pairs; 2-5, a belt pulley transmission pair; 3. a raw material bin; 4. a hoist; 5. conveying a metering scale; 6. a feeding screw; 7. a feed back screw; 8. a classifier; 9. a volute type air inlet device; 9-1, an air inlet cylinder; 9-2, an involute type air inlet cover; 10. a return screw; 11. a pulse dust collector; 12. an induced draft fan; 13. a hopper; 14. and a wind powder pipe.
Detailed Description
The technical scheme of the utility model is further described below with reference to the embodiment shown in the drawings.
The utility model relates to an external grading grinding system of a vertical mill for a powdery raw material with low content of fine powder, which comprises a main machine 1 of the vertical mill, a feeding unit, an external grading unit of the main machine and a dust collection and air introduction unit.
The vertical mill main machine 1 comprises a millstone device and a millstone roller device which are arranged in a main machine cover cylinder 1-1, wherein the millstone 1-2 of the millstone device is arranged on a base and driven to rotate by a motor with a speed reducer 1-3, the circumference of a millstone roller 1-4 of the millstone roller device is uniformly distributed and rolled on a milling surface at the outer edge of the millstone 1-2 under the action of a correspondingly arranged pressurizing mechanism 1-5, a disperser 2 is arranged at the top of the main machine cover cylinder 1-1, an air inlet (lower than the millstone 1-2) and a water inlet (higher than the millstone 1-2) are uniformly distributed at the circumference of the lower part of the main machine cover cylinder 1-1 and are communicated with a water inlet pipe, a water outlet of the water inlet pipe corresponds to the milling surface, and a main machine discharge port is arranged at the bottom of the main machine cover cylinder 1-1; the dispersing cylinder 2-1 of the disperser 2 is coaxially arranged at the upper opening of the main machine cover cylinder 1-1, the main machine cover cylinder 1-1 below the dispersing cylinder 2-1 is coaxially provided with an ash bucket 2-2, the diameter of the upper opening of the ash bucket 2-2 is smaller than the inner diameter of the main machine cover cylinder 1-1, the discharge opening at the bottom of the ash bucket 2-2 is coaxially positioned above the grinding disc 1-2, the hopper body of the ash bucket 2-2 is provided with a feeding opening, the dispersing cylinder 2-1 is coaxially provided with a dispersing rotary disc 2-3 arranged on the output shaft of the bevel gear transmission pair 2-4, the input shaft of the bevel gear transmission pair 2-4 is connected with the pulley transmission pair 2-5 driven by the dispersing motor outside the dispersing cylinder 2-1, the top of the dispersing cylinder 2-1 is coaxially provided with an air outlet, and the dispersing cylinder 2-1 above the dispersing rotary disc 2-3 is provided with a feeding opening, as shown in figures 1 and 2.
The feeding unit comprises a raw material bin 3 and a lifting machine 4, a discharge hole at the bottom of the raw material bin 3 is communicated with a feed hole at the lower end of the lifting machine 4 through a conveying metering scale 5 (preferably a spiral metering scale), an iron remover is arranged on the communication outlet of the feed hole of the conveying metering scale 5 and the feed hole of the lifting machine 4, the feed hole of the lifting machine 4 is also communicated with a discharge hole of a return material spiral machine 7, the feed hole of the return material spiral machine 7 is communicated with a host discharge hole of a host machine cover cylinder 1-1, the discharge hole at the upper end of the lifting machine 4 is communicated with a feed hole (provided with a wind locking feed valve) of a feed spiral machine 6, the front part of the feed spiral machine 6 enters the dispersing cylinder 2-1 from the side through the feed hole, and the discharge hole of the feed spiral machine 6 is positioned above the center of the dispersing turntable 2-3, as shown in fig. 1 and 2.
The main machine external classification unit comprises a classifier 8 and a volute type air inlet device 9, an air inlet barrel 9-1 of the volute type air inlet device 9 comprises a cylindrical barrel on the upper part and a conical barrel on the lower part, an involute type air inlet cover 9-2 is coaxially arranged at the upper opening of the cylindrical barrel of the air inlet barrel 9-1, a barrel of the classifier 8 is communicated with the involute type air inlet cover 9-2 through a hopper 13, the bottom of the conical barrel of the air inlet barrel 9-1 is a discharge opening, a pipe hole air supply powder pipe 14 is arranged on the conical barrel in a penetrating manner obliquely upwards and enters, the upper end of the air powder pipe 14 is coaxially higher than the involute type air inlet cover 9-2 and is arranged in the hopper 13, the lower end of the air powder pipe 14 is communicated with an air outlet on the top of the dispersing barrel 2-1, the discharge opening on the bottom of the conical barrel is communicated with a feed inlet (provided with a wind locking feed valve) of the returning screw 10, and the front part of the returning screw 10 enters the main machine cover barrel 1-1 from the side and is communicated with the feed inlet on the ash hopper 2-2 from the side, as shown in figures 1, 2 and 3.
The dust collection induced air unit comprises a pulse dust collector 11 and an induced draft fan 12, wherein a feed inlet of the pulse dust collector 11 is communicated with a qualified powder discharge outlet of the classifier 8, an air inlet of the induced draft fan 12 is communicated with an air outlet of the pulse dust collector 11, and a silencer is arranged at an air outlet of the induced draft fan 12, as shown in figure 1.
The utility model relates to an external grading grinding method of a fine powder low-content powdery raw material vertical mill, which comprises the following grinding process flows:
1. the induced draft fan 12 is started and forms a negative pressure wind flow direction from the main hood barrel 1-1 to the dispersing barrel 2-1, from the dispersing barrel 2-1 to the classifier 8, from the classifier 8 to the pulse dust collector 11, from the pulse dust collector 11 to the induced draft fan 12 and from the induced draft fan 12 to the atmosphere.
2. The fine powder low-content powdery raw material (the fine powder proportion is more than or equal to 30 percent and less than or equal to 50 percent) in the raw material bin 3 is quantitatively fed into the lifting machine 4 through the conveying metering scale 5, and the lifting machine 4 lifts the raw material and then feeds the raw material into the disperser 2 through the feeding screw 6.
3. Raw materials fall onto the dispersing turntable 2-3, the dispersing turntable 2-3 rotating at a high speed breaks up raw materials to the periphery, the dispersed raw materials are lifted up along with negative pressure wind power, in the lifting process, thicker raw materials fall into the ash bucket 2-2 and fall into the center of the millstone 1-2 in a concentrated manner, under the action of centrifugal force, the raw materials are thrown into the grinding surface at the outer edge of the millstone 1-2, a certain proportion of water is added into the raw materials through the water inlet pipe and then are ground by the grinding roller 1-4, and in the grinding process, the raw materials are lifted up again by spiral upward wind power.
4. In the dispersing and grinding process, finer powder enters the classifier 8 through the air-powder pipe 14 under the action of wind force, the fine powder is sorted by the classifier 8, qualified fine powder enters the pulse dust collector 11, finished products are discharged from a discharge hole of the pulse dust collector 11, and clean wind filtered by the pulse dust collector 11 is discharged into the atmosphere through the induced draft fan 12 and the muffler.
5. The powder which is not sorted by the classifier 8 falls into a hopper 13 and is lifted again under the action of wind power which actively enters from the involute air inlet hood 9-2, and the qualified powder contained in the powder which is not sorted is re-sorted by the classifier 8 and enters a pulse dust collector 11 for collection.
6. The unqualified powder is discharged into a returning material screw machine 10 through a discharge hole at the bottom of an air inlet barrel 9-1 of a spiral case type air inlet device 9, the returning material screw machine 10 sends the unqualified powder into an ash bucket 2-2, and the unqualified powder falls into a millstone 1-2 through the ash bucket 2-2 to be ground again.
7. Excessive overflowed powder falls to the bottom of the main machine cover cylinder 1-1 through the millstone 1-2 and is discharged into the feed back screw 7 from the main machine discharge hole, and the feed back screw 7 sends the powder into the elevator 4, returns the powder to the disperser 2 through the elevator 4 and is re-participated in the grinding process together with the new raw material.

Claims (2)

1. The external grading grinding system of the fine powder low-content powdery raw material vertical mill comprises a vertical mill main machine (1), a feeding unit, an external grading unit of the main machine and a dust collection and air introduction unit, and is characterized in that:
the vertical mill main machine (1) comprises a millstone device and a millstone roller device which are arranged in a main machine cover cylinder (1-1), wherein the millstone (1-2) of the millstone device is arranged on a base and driven to rotate by a speed reducer (1-3), the circumference of a millstone roller (1-4) of the millstone roller device is uniformly distributed and rolled on the milling surface of the millstone roller (1-2) under the action of a pressurizing mechanism (1-5) which is correspondingly arranged, a disperser (2) is arranged at the top of the main machine cover cylinder (1-1), an air inlet and a water inlet are uniformly distributed on the circumference of the lower part of the main machine cover cylinder (1-1), and a main machine discharge hole is formed in the bottom of the main machine cover cylinder (1-1);
the feeding unit comprises a raw material bin (3) and a lifting machine (4), wherein the raw material bin (3) is communicated with a feed inlet of the lifting machine (4) through a conveying metering scale (5), a discharge outlet of the lifting machine (4) is communicated with a feed inlet at the side part of the disperser (2) through a feeding screw machine (6), a discharge outlet at the bottom of the disperser (2) is positioned above the center of the millstone (1-2), and a host discharge outlet is communicated with the feed inlet of the lifting machine (4) through a feed back screw machine (7);
the main machine external classification unit comprises a classifier (8) and a volute type air inlet device (9), the classifier (8) is communicated with the volute type air inlet device (9) through a hopper (13), the volute type air inlet device (9) is communicated with an air outlet at the top of the disperser (2) through a wind powder pipe (14), and a discharge hole of the volute type air inlet device (9) is communicated with a discharge hole of the disperser (2) through a return screw (10) which enters the main machine cover cylinder (1-1);
the dust collection induced air unit comprises a pulse dust collector (11) and an induced draft fan (12), wherein a feed inlet of the pulse dust collector (11) is communicated with a qualified powder discharge outlet of the classifier (8), and an air inlet of the induced draft fan (12) is communicated with an air outlet of the pulse dust collector (11);
the disperser (2) comprises a dispersing cylinder (2-1) coaxially arranged at the top of a main machine cover cylinder (1-1) and an ash bucket (2-2) coaxially arranged in the main machine cover cylinder (1-1) below the dispersing cylinder (2-1) and positioned above the millstone (1-2), wherein a dispersing rotary table (2-3) positioned below a discharge hole of the feeding screw machine (6) is coaxially arranged in the dispersing cylinder (2-1), and the dispersing rotary table (2-3) is connected with a dispersing motor through a bevel gear transmission pair (2-4) and a belt pulley transmission pair (2-5);
the air inlet barrel (9-1) of the spiral case type air inlet device (9) is communicated with the hopper (13) through the involute type air inlet cover (9-2), the air powder pipe (14) penetrates through the barrel of the air inlet barrel (9-1), the upper end of the air powder pipe (14) is coaxially arranged at the communicating position of the involute type air inlet cover (9-2) and the hopper (13), and the lower end of the air powder pipe (14) is communicated with the air outlet of the disperser (2).
2. The external grading grinding method of the fine powder low-content powdery raw material vertical mill is characterized in that the external grading grinding system of the fine powder low-content powdery raw material vertical mill according to claim 1 is adopted, and the grinding process flow is as follows:
(1) starting the induced draft fan (12);
(2) the raw materials in the raw material bin (3) are quantitatively fed into a lifting machine (4) through a conveying metering scale (5), and the lifting machine (4) lifts the raw materials and then feeds the raw materials into a disperser (2) through a feeding screw machine (6);
(3) in the disperser (2), the raw materials are scattered around and lifted by upward wind, the thicker raw materials are concentrated in the center of the millstone (1-2), and are thrown to the milling surface of the millstone (1-2) under the action of centrifugal force and are milled by the milling roller (1-4) after being added with water, and the raw materials are lifted again by wind in the milling process;
(4) the finer raw materials enter a classifier (8) under the action of wind power, qualified fine powder after separation enters a pulse dust collector (11) to be collected, and the wind filtered by the pulse dust collector (11) is discharged into the atmosphere through a draught fan (12);
(5) the unsorted powder is lifted again by the wind power of the spiral case type air inlet device (9), and the qualified powder contained in the unsorted powder is subjected to the recleaning by the classifier (8) and enters the pulse dust collector (11) for collection;
(6) the disqualified sorting return materials are sent into a disperser (2) through a return screw machine (10) and fall into a millstone (1-2) to be ground again;
(7) the blanking at the bottom of the main hood cylinder (1-1) returns to the lifting machine (4) through the return screw machine (7) and is ground together with the new raw material.
CN202010646218.XA 2020-07-07 2020-07-07 External grading grinding system and method for fine powder low-content powdery raw material vertical mill Active CN111644237B (en)

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CN117680257B (en) * 2024-02-01 2024-04-26 晋江哈创投资有限公司 Intelligent airflow powder crushing and grading system

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CN110860343A (en) * 2019-11-15 2020-03-06 南京钜力智能制造技术研究院有限公司 External circulation system and process for raw material vertical mill
CN213050877U (en) * 2020-07-07 2021-04-27 桂林鸿程矿山设备制造有限责任公司 External grading grinding system of vertical mill for powdery raw materials with low content of fine powder

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JP2011240305A (en) * 2010-05-21 2011-12-01 Nakayama Iron Works Ltd Wind power sorting device
CN207138023U (en) * 2017-07-11 2018-03-27 桂林矿山机械有限公司 Multistage powder flour mill
CN209810321U (en) * 2019-02-13 2019-12-20 桂林鸿程矿山设备制造有限责任公司 Vertical powder mill for powder material
CN110860343A (en) * 2019-11-15 2020-03-06 南京钜力智能制造技术研究院有限公司 External circulation system and process for raw material vertical mill
CN213050877U (en) * 2020-07-07 2021-04-27 桂林鸿程矿山设备制造有限责任公司 External grading grinding system of vertical mill for powdery raw materials with low content of fine powder

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