CN213050877U - External grading grinding system of vertical mill for powdery raw materials with low content of fine powder - Google Patents
External grading grinding system of vertical mill for powdery raw materials with low content of fine powder Download PDFInfo
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- CN213050877U CN213050877U CN202021315768.5U CN202021315768U CN213050877U CN 213050877 U CN213050877 U CN 213050877U CN 202021315768 U CN202021315768 U CN 202021315768U CN 213050877 U CN213050877 U CN 213050877U
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Abstract
The utility model discloses an external grading grinding system of a vertical mill for powdery raw materials with low content of fine powder, which comprises a mill device and a grinding roller device in a host machine cover cylinder, wherein the host machine cover cylinder is provided with a disperser, and the host machine cover cylinder is provided with an air inlet, a water inlet and a host machine discharge port; 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 utility model discloses reduced and to the fine powder grinding in the raw materials, improved the productivity, reduced the energy consumption.
Description
Technical Field
The utility model relates to a powder processing technology specifically is a farine low-content likepowder raw materials grinds grinding system of outer grading immediately.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a vertical mill external grading grinding system corresponding to the low-content powder raw materials of farine.
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 vertical mill main machine comprises a grinding disc device and a grinding roller device which are arranged in a main machine cover cylinder, wherein a grinding disc of the grinding disc 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 grinding disc under the action of a pressurizing mechanism 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 on the circumference of the lower part of the main machine cover cylinder, and a main machine discharge port is formed at the bottom of the main.
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 utility model has the advantages that:
the utility model discloses farine low content powdery raw materials grinds grinding system in grades outside immediately can sort earlier before the raw materials grinds, and the farine part that reaches the fineness requirement is sorted out, and remaining coarse grain grinds again, has more thoroughly solved the fine powder part's that reaches the fineness requirement among the raw materials grinding problem excessively to improve the productivity and reduced the energy consumption, improved 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 utility model discloses farine low content powdery raw materials grinds grinding system of outer stage immediately, including mill host computer 1, feed unit, the outer stage unit of host computer and the induced air unit that gathers dust.
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 cylinder 9-1 of the volute type air inlet 9 comprises an upper cylindrical cylinder and a lower conical cylinder, an involute type air inlet cover 9-2 is coaxially arranged at the upper opening of the cylindrical cylinder of the air inlet cylinder 9-1, the cylinder body 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 cylinder of the air inlet cylinder 9-1, a pipe hole is formed in the conical cylinder and is 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 is 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 cylinder 2-1, the discharge opening in the bottom of the conical cylinder is communicated with a feed opening (provided with an air locking feed valve) of a return screw machine 10, and the front portion of the return screw machine 10 enters the -a feeding port on 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 utility model discloses the outer hierarchical grinding method of the likepowder raw materials vertical mill of the low content of farine, its grinding process flow is:
1. and starting the induced draft fan 12 to form negative pressure wind flow directions 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 (4)
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 vertical mill main 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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021315768.5U CN213050877U (en) | 2020-07-07 | 2020-07-07 | External grading grinding system of vertical mill for powdery raw materials with low content of fine powder |
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| CN202021315768.5U CN213050877U (en) | 2020-07-07 | 2020-07-07 | External grading grinding system of vertical mill for powdery raw materials with low content of fine powder |
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| CN213050877U true CN213050877U (en) | 2021-04-27 |
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| CN202021315768.5U Active CN213050877U (en) | 2020-07-07 | 2020-07-07 | External grading grinding system of vertical mill for powdery raw materials with low content of fine powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111644237A (en) * | 2020-07-07 | 2020-09-11 | 桂林鸿程矿山设备制造有限责任公司 | External grading grinding system and method for vertical mill of powdery raw material with low content of fine powder |
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2020
- 2020-07-07 CN CN202021315768.5U patent/CN213050877U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111644237A (en) * | 2020-07-07 | 2020-09-11 | 桂林鸿程矿山设备制造有限责任公司 | External grading grinding system and method for vertical mill of powdery raw material with low content of fine powder |
| CN111644237B (en) * | 2020-07-07 | 2023-08-29 | 桂林鸿程矿山设备制造有限责任公司 | External grading grinding system and method for fine powder low-content powdery raw material vertical mill |
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