CN111644237A - External grading grinding system and method for vertical mill of powdery raw material with low content of fine powder - Google Patents
External grading grinding system and method for vertical mill of powdery raw material with low content of fine powder Download PDFInfo
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- CN111644237A CN111644237A CN202010646218.XA CN202010646218A CN111644237A CN 111644237 A CN111644237 A CN 111644237A CN 202010646218 A CN202010646218 A CN 202010646218A CN 111644237 A CN111644237 A CN 111644237A
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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
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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
- B02C21/00—Disintegrating plant with or without drying of the material
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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
- 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
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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
- 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
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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
- 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
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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
- 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
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- 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
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- 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
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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
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
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- 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 invention discloses a system and a method for external graded grinding of a vertical mill for powdery raw materials with low content of fine powder.A grinding main machine comprises a grinding disc device and a grinding roller device which are arranged in a main machine cover cylinder, wherein 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 in the main machine cover cylinder; the feeding unit comprises a raw material bin and a lifting machine, the raw material bin is communicated with the lifting machine through a conveying metering scale, the lifting machine is communicated with a disperser through a feeding screw machine, and a discharge port of a main machine is communicated with the lifting machine through a return screw machine; the grading unit outside the host comprises a grading machine and a volute air inlet device, wherein the grading machine is communicated with the volute air inlet device through a hopper, and the volute air inlet device is communicated with a disperser through an air powder pipe and is communicated with the disperser through a material returning screw machine; the dust collection and air induction unit comprises a pulse dust collector and an induced draft fan, wherein the pulse dust collector is communicated with the grader, and the induced draft fan is communicated with the pulse dust collector. The invention reduces the over-grinding of the fine powder in the raw materials, improves the productivity and reduces the energy consumption.
Description
Technical Field
The invention relates to a powder processing technology, in particular to a system and a method for external graded grinding of a vertical mill for powdery raw materials with low content of fine powder.
Background
In the traditional grinding process of a vertical mill, a feeding mode is that a powdery raw material (such as fly ash) is fed into a mill by a feeder and falls onto a grinding disc to be directly ground, and a fine powder part meeting the fineness requirement and a particle part not meeting 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 fine powder meeting the fineness requirement in the powdery raw material is more than 30%, the fine powder meeting the fineness requirement is redundant, and the excessive content of the fine powder in the powdery raw material is not beneficial to the formation and stability 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 the millstone and avoid the transitional grinding, the utility model with the authorization notice number of CN205833268U provides a vertical external circulation flour mill, which is characterized in that the powdery raw materials in the main machine of the vertical mill are timely led out and are separated by a grader arranged outside the main machine of the vertical mill, the qualified fine powder is collected by a dust collector, and the unqualified powder is led into the main machine of the vertical mill and is milled again.
Because the supplied powdery raw materials are mixed with fine and coarse powder and have different proportions, the vertical external circulation grinding mill adopts the same undifferentiated grinding 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, and only partially solves the problem of transitional grinding.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a vertical mill external grading grinding system and a method corresponding to a powdery raw material with low content of fine powder.
The external grading grinding system of the vertical mill for the powdery raw materials with low content of fine powder, which can solve the problems in the prior art, comprises a main machine of the vertical mill, a feeding unit, an external grading unit of the main machine and a dust collection and air induction unit, and is characterized in that:
1. the mill main machine comprises a mill device and a grinding roller device which are arranged in a main machine cover cylinder, a mill of the mill device is arranged on a base and is driven to rotate by a speed reducer, grinding rollers of the grinding roller device are uniformly distributed on the circumference and roll on a grinding surface of the mill under the action of a corresponding pressure mechanism, the top of the main machine cover cylinder is provided with a disperser, an air inlet and a water inlet are uniformly distributed on the circumference of the lower part of the main machine cover cylinder, and a main machine discharge port is formed in the bottom of the main machine cover cylinder.
2. The feeding unit comprises a raw material bin and a lifting machine, the raw material bin is communicated with a feeding hole of the lifting machine through a conveying metering scale, a discharging hole of the lifting machine is communicated with a feeding hole of the side part of the disperser through a feeding screw machine, a discharging hole at the bottom of the disperser is positioned above the center of the grinding disc, and a discharging hole of the host machine is communicated with the feeding hole of the lifting machine through a returning screw machine.
3. The grading unit outside the host comprises a grading machine and a volute air inlet device, the grading machine is communicated with the volute air inlet device through a hopper, the volute air inlet device is communicated with an air outlet at the top of the disperser through a pulverized coal pipe, and a discharge port of the volute air inlet device is communicated with a discharge port of the disperser through a material returning screw machine entering a cover cylinder of the host.
4. The dust collection and air induction unit comprises a pulse dust collector and an induced draft fan, a feed inlet of the pulse dust collector is communicated with a qualified powder discharge hole of the classifier, and an air inlet of the induced draft fan is communicated with an air outlet of the pulse dust collector.
One structure of the disperser comprises a dispersing cylinder coaxially arranged at the top of a main machine cover cylinder and an ash bucket which is coaxially arranged in the main machine cover cylinder below the dispersing cylinder and is positioned above a grinding disc, wherein a dispersing turntable positioned below a discharge port of a feeding screw machine is coaxially arranged in the dispersing cylinder, and the dispersing turntable 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 cylinder 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 cylinder body of the air inlet cylinder, the upper end of the air powder pipe is coaxially arranged at the communication 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 a disperser.
Conventionally, the air outlet of draught fan is installed the muffler in order to reduce the noise.
The grinding process flow of the external grading grinding system adopting the vertical mill for the powdery raw materials with low content of fine powder is as follows:
1. and starting the induced draft fan.
2. The powdery raw materials with low content of fine powder in the raw material bin are quantitatively fed into the elevator through the conveying and metering scale, and the elevator lifts the raw materials and then sends the raw materials into the disperser through the feeding screw machine.
3. In the disperser, the raw materials are scattered to the periphery and are lifted by upward wind, the thicker raw materials are concentrated and fall to the center of the millstone, the thicker raw materials are thrown to the grinding surface (grinding area) of the millstone under the action of centrifugal force and are ground by the grinding roller after being added with water, and the raw materials are lifted by wind again in the grinding process.
4. The fine raw materials enter a classifier under the action of wind power, the qualified powder after separation enters a pulse dust collector for collection, and the wind which is filtered by the pulse dust collector is exhausted to the atmosphere through a draught fan.
5. The unsorted powder is lifted up again by the wind power (active air inlet) of the volute type air inlet device, and the qualified powder contained in the unsorted powder is sorted by the grader and enters the pulse dust collector.
6. The rejected sorted returns are fed into the disperser by the return screw and fall into the mill to be ground again.
7. The blanking at the bottom of the main machine cover cylinder is returned to the lifter through the material returning screw and participates in grinding again together with the newly fed raw materials.
The invention has the beneficial effects that:
the external grading grinding system and the external grading grinding method for the powdery raw material with low content of fine powder can sort the raw material before grinding, sort out the fine powder part meeting the fineness requirement, and grind the remaining coarse particles, thereby thoroughly solving the problem of over-grinding the fine powder part meeting the fineness requirement in the raw material, improving the productivity, reducing the energy consumption and improving the stability of system operation.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the main body of the vertical milling machine in the embodiment of fig. 1.
Fig. 3 is a schematic structural diagram of an external-host hierarchical unit in the embodiment of fig. 1.
And (3) identifying the figure number: 1. a vertical mill main machine; 1-1, a host hood cylinder; 1-2, grinding disc; 1-3, a speed reducer; 1-4, grinding rollers; 1-5, a pressurizing mechanism; 2. a disperser; 2-1, a dispersing cylinder; 2-2, an ash bucket; 2-3, dispersing the rotating disc; 2-4, a bevel gear transmission pair; 2-5, a belt pulley transmission pair; 3. a raw material bin; 4. a hoist; 5. conveying a metering scale; 6. a feeding screw machine; 7. a feed back screw machine; 8. a classifier; 9. a volute air inlet device; 9-1, an air inlet cylinder; 9-2, an involute air inlet cover; 10. a material returning screw machine; 11. a pulse dust collector; 12. an induced draft fan; 13. a hopper; 14. a wind powder pipe.
Detailed Description
The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.
The invention relates to an external grading grinding system of a vertical mill for powdery raw materials with low content of fine powder, which comprises a vertical mill main machine 1, a feeding unit, an external grading unit of the main machine and a dust collection and air induction unit.
The vertical mill main machine 1 comprises a mill disc device and a mill roller device which are arranged in a main machine cover cylinder 1-1, a mill disc 1-2 of the mill disc device is arranged on a base and is driven to rotate by a motor with a speed reducer 1-3, mill rollers 1-4 of the mill roller device are uniformly distributed on the circumference and roll on a mill surface on the outer edge of the mill disc 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 mill disc 1-2) and a water inlet (higher than the mill disc 1-2) are uniformly distributed on the circumference of the lower part of the main machine cover cylinder 1-1 and communicated with a water inlet pipe, a water outlet of the water inlet pipe corresponds to the mill surface; 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 ash bucket 2-2 is coaxially arranged in the main machine cover cylinder 1-1 below the dispersing cylinder 2-1, 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 feed opening, the dispersing cylinder 2-1 is internally and coaxially provided with a dispersing turntable 2-3 arranged on the output shaft of a bevel gear transmission pair 2-4, the input shaft of the bevel gear transmission pair 2-4 is connected with a belt pulley transmission pair 2-5 driven by a dispersing motor outside the dispersing cylinder 2-1, the top of the dispersing cylinder 2-1 is coaxially provided with an air outlet, the barrel body of the dispersing cylinder 2-1 above the dispersing turntable 2-3, as shown in fig. 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), a deironing device is arranged at the communication part 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 screw machine 7, the feed hole of the return screw machine 7 is communicated with a main machine discharge hole of a main machine cover barrel 1-1, a discharge hole at the upper end of the lifting machine 4 is communicated with a feed hole (provided with an air locking feed valve) of a feed screw machine 6, the front part of the feed screw machine 6 enters a dispersion barrel 2-1 through the feed hole from the side, and the discharge hole of the feed screw.
The grading unit outside the host comprises a grading machine 8 and a volute type air inlet 9, an air inlet barrel 9-1 of the volute type air inlet 9 comprises an upper cylindrical barrel and a lower conical barrel, 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, the barrel of the grading machine 8 is communicated with the involute type air inlet cover 9-2 through a hopper 13, a discharge opening is formed in the bottom of the conical barrel of the air inlet barrel 9-1, a pipe hole is formed in the conical barrel and used for an air powder pipe 14 to penetrate upwards in an inclined mode, the upper end of the air powder pipe 14 is coaxially higher than the involute type air inlet cover 9-2 and arranged in the hopper 13, the lower end of the air powder pipe 14 is communicated with an air outlet in the top of a dispersion barrel 2-1, the discharge opening in the bottom of the conical barrel is communicated with a feed opening (provided with an air locking feed valve) of a return screw machine 10, and the front part of the return screw machine 10 enters the host cover barrel 1-1 2, as shown in fig. 1, 2, 3.
The dust collection and air induction unit comprises a pulse dust collector 11 and an induced draft fan 12, a feed inlet of the pulse dust collector 11 is communicated with a qualified powder discharge hole 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 an air outlet of the induced draft fan 12 is provided with a silencer, as shown in fig. 1.
The invention relates to a vertical mill external grading grinding method for powdery raw materials with low content of fine powder, which comprises the following grinding process flows:
1. and starting the induced draft fan 12 to form a negative pressure wind flow direction from the main machine cover cylinder 1-1 to the dispersing cylinder 2-1, from the dispersing cylinder 2-1 to the grader 8, from the grader 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 powdery raw material with low content of fine powder (the proportion of the fine powder 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 elevator 4 through the conveying and metering scale 5, and the elevator 4 lifts the raw material and then sends the raw material into the disperser 2 through the feeding screw machine 6.
3. The raw materials fall onto the dispersion rotary table 2-3, the dispersion rotary table 2-3 rotating at a high speed scatters the raw materials to the periphery, the dispersed raw materials are upwards lifted along with negative pressure wind power, in the lifting process, the thicker raw materials fall into the ash bucket 2-2 and fall into the center of the grinding disc 1-2 in a centralized manner, the raw materials are thrown into the grinding surface at the outer edge of the grinding disc 1-2 under the action of centrifugal force, water with a certain proportion 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 by the wind power which is upwards spirally again.
4. In the dispersing and grinding processes, the fine powder enters the classifier 8 through the air powder pipe 14 under the action of wind power, the fine powder is classified by the classifier 8, qualified fine powder enters the pulse dust collector 11, a finished product is discharged from a discharge hole of the pulse dust collector 11, and clean air filtered by the pulse dust collector 11 is discharged into the atmosphere through the induced draft fan 12 and the silencer.
5. The powder which is not sorted by the grader 8 falls to the hopper 13 and is lifted again under the action of wind power which actively enters from the involute air inlet cover 9-2, and qualified powder contained in the unsorted powder is reclassified by the grader 8 and enters the pulse dust collector 11 for collection.
6. Unqualified powder is discharged into a return material screw machine 10 through a discharge hole at the bottom of an air inlet cylinder 9-1 of a volute type air inlet device 9, the unqualified powder is sent into an ash hopper 2-2 by the return material screw machine 10, and the unqualified powder falls to a grinding disc 1-2 through the ash hopper 2-2 to participate in grinding again.
7. The excessive overflowed powder falls to the bottom of the main machine cover cylinder 1-1 through the grinding disc 1-2 and is discharged into the return screw machine 7 from the main machine discharge port, the return screw machine 7 sends the powder into the lifting machine 4, the powder is returned to the disperser 2 through the lifting machine 4, and the powder and the newly-fed raw materials participate in the grinding process again.
Claims (5)
1. The external grading grinding system of the vertical mill for the powdery raw materials with low content of fine powder comprises a vertical mill main machine (1), a feeding unit, an external grading unit of the main machine and a dust collection and air induction unit, and is characterized in that:
the main grinding machine (1) comprises a grinding disc device and a grinding roller device which are arranged in a main machine cover cylinder (1-1), a grinding disc (1-2) of the grinding disc device is arranged on a base and is driven to rotate by a speed reducer (1-3), grinding rollers (1-4) of the grinding roller device are uniformly distributed on the circumference and roll on a grinding surface of the grinding disc (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 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 port is arranged at the bottom of the main machine cover cylinder (1-1);
the feeding unit comprises a raw material bin (3) and an elevator (4), the raw material bin (3) is communicated with a feeding hole of the elevator (4) through a conveying metering scale (5), a discharging hole of the elevator (4) is communicated with a feeding hole at the side part of the disperser (2) through a feeding screw machine (6), a discharging hole at the bottom of the disperser (2) is positioned above the center of the grinding disc (1-2), and a discharging hole of the main machine is communicated with the feeding hole of the elevator (4) through a material returning screw machine (7);
the grading unit outside the main machine comprises a grading machine (8) and a volute type air inlet device (9), the grading machine (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 in the top of the disperser (2) through an air 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 material returning screw machine (10) entering a main machine cover cylinder (1-1);
the dust collection and air induction unit comprises a pulse dust collector (11) and an induced draft fan (12), a feed inlet of the pulse dust collector (11) is communicated with a qualified powder discharge hole 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).
2. The external staged milling system of a vertical mill for low content of fine powder raw material as claimed in claim 1, wherein: the disperser (2) comprises a dispersing cylinder (2-1) coaxially mounted at the top of the 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 grinding disc (1-2), a dispersing turntable (2-3) positioned below a discharge port of the feeding screw machine (6) is coaxially arranged in the dispersing cylinder (2-1), and the dispersing turntable (2-3) is connected with a dispersing motor through a bevel gear transmission pair (2-4) and a belt pulley transmission pair (2-5).
3. The external staged milling system of a vertical mill for low content of fine powder raw material as claimed in claim 1, wherein: an air inlet cylinder (9-1) of the volute type air inlet device (9) is communicated with a hopper (13) through an involute type air inlet cover (9-2), an air powder pipe (14) penetrates through a cylinder body of the air inlet cylinder (9-1), the upper end of the air powder pipe (14) is coaxially arranged at the communication 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 an air outlet of a disperser (2).
4. The external staged milling system of a vertical mill for low content of fine powder as claimed in any one of claims 1 to 3, wherein: and a silencer is arranged at an air outlet of the induced draft fan (12).
5. The external graded grinding method of the vertical mill for the powdery raw materials with low content of fine powder is characterized by adopting the external graded grinding system of the vertical mill for the powdery raw materials with low content of fine powder according to any one of claims 1 to 3, and the grinding process flow is as follows:
firstly, a draught fan (12) is started.
Secondly, the raw materials in the raw material bin (3) are quantitatively fed into a lifter (4) through a conveying metering scale (5), and the lifter (4) lifts the raw materials and then sends the raw materials into a disperser (2) through a feeding screw machine (6);
thirdly, in the disperser (2), the raw materials are scattered to the periphery and are lifted by upward wind, the thicker raw materials are concentrated and fall to the center of the millstone (1-2), are thrown to the grinding surface of the millstone (1-2) under the action of centrifugal force, are added with water and are ground by the grinding roller (1-4), and the raw materials are lifted by wind again in the grinding process;
enabling the fine raw materials to enter a classifier (8) under the action of wind power, enabling the qualified fine powder after sorting to enter a pulse dust collector (11) for collection, and exhausting the wind filtered by the pulse dust collector (11) to the atmosphere through a draught fan (12);
the unsorted powder is lifted again by the wind power of a volute type air inlet device (9), and the qualified powder contained in the unsorted powder is reclassified by a grader (8) and enters a pulse dust collector (11) for collection;
sixthly, sending the unqualified sorted returned materials into a disperser (2) through a returned material screw machine (10), falling into a grinding disc (1-2) and grinding again;
and seventhly, returning the blanking at the bottom of the main machine cover cylinder (1-1) to the lifting machine (4) through a material returning screw machine (7) and grinding the blanking again together with the newly-fed raw materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646218.XA CN111644237B (en) | 2020-07-07 | 2020-07-07 | External grading grinding system and method for fine powder low-content powdery raw material vertical mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010646218.XA CN111644237B (en) | 2020-07-07 | 2020-07-07 | External grading grinding system and method for fine powder low-content powdery raw material vertical mill |
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| CN111644237A true CN111644237A (en) | 2020-09-11 |
| CN111644237B CN111644237B (en) | 2023-08-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247522A (en) * | 2021-12-23 | 2022-03-29 | 桂林鸿程矿山设备制造有限责任公司 | Superfine vertical milling machine |
| CN117680257A (en) * | 2024-02-01 | 2024-03-12 | 晋江哈创投资有限公司 | Intelligent airflow powder crushing and grading system |
| CN119034882A (en) * | 2024-10-31 | 2024-11-29 | 潍坊莒国塑胶有限公司 | Nanoscale powder grinding and selecting device and powder selecting method |
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| 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 | A raw material vertical mill external circulation system and process |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247522A (en) * | 2021-12-23 | 2022-03-29 | 桂林鸿程矿山设备制造有限责任公司 | Superfine vertical milling machine |
| CN117680257A (en) * | 2024-02-01 | 2024-03-12 | 晋江哈创投资有限公司 | Intelligent airflow powder crushing and grading system |
| 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 |
| CN119034882A (en) * | 2024-10-31 | 2024-11-29 | 潍坊莒国塑胶有限公司 | Nanoscale powder grinding and selecting device and powder selecting method |
| CN119034882B (en) * | 2024-10-31 | 2025-01-28 | 潍坊莒国塑胶有限公司 | Nanoscale powder grinding and selecting device and powder selecting method |
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| CN111644237B (en) | 2023-08-29 |
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