CN211463353U - External circulation system of raw material vertical mill - Google Patents
External circulation system of raw material vertical mill Download PDFInfo
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- CN211463353U CN211463353U CN201921973193.3U CN201921973193U CN211463353U CN 211463353 U CN211463353 U CN 211463353U CN 201921973193 U CN201921973193 U CN 201921973193U CN 211463353 U CN211463353 U CN 211463353U
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Abstract
The invention discloses a raw material vertical mill external circulation system, which comprises a batching belt conveyor, a lifter, a feeding and conveying mechanism, a feeding tee joint, a V-shaped powder concentrator, an external circulation roller type vertical mill, a cyclone cylinder, a circulating fan and a dust remover, wherein the batching belt conveyor is arranged on the top of the raw material vertical mill; the external circulation roller type vertical mill comprises a grinding cylinder body at the lower part and a powder selecting cylinder body at the upper part, a mill is arranged in the grinding cylinder body, a powder selecting machine is arranged in the powder selecting cylinder body, the grinding cylinder body and the powder selecting cylinder body are separated by a partition plate, and an outlet of a powder selecting coarse powder ash hopper of the powder selecting machine penetrates through the partition plate and extends into the grinding cylinder body. The materials are not conveyed to the powder concentrator through pneumatic conveying for separation, and are conveyed by a hoister in a centralized mechanical mode, so that the airflow resistance is greatly reduced, and the power consumption is greatly reduced. The powder concentrator is still above the vertical mill, so that the civil engineering cost can be greatly reduced, and the equipment investment can be greatly saved.
Description
Technical Field
The invention relates to a material bed grinding device, in particular to an external circulation system of a raw material vertical mill.
Background
At present, roller type vertical mill equipment is mostly adopted for raw material production in a cement production line, and the traditional grinding equipment has the problems of low yield and high power consumption. Because the system process is the traditional process, the materials in the mill need wind power transportation, nozzle ring injection and the like, the gas flow resistance is greatly increased, the system resistance of the mill reaches 8000-10000Pa or even higher, and in addition, due to the structure of the powder concentrator, the powder concentration capability is insufficient, the powder return amount is large, the classification efficiency is low, and the performance of the mill capability is influenced. In addition, the unreasonable design of the parameters of the grinding mechanism is also one of the factors influencing the productivity of the raw material vertical grinding system. The production and energy-saving technology of the material pulverizing mill system needs to be upgraded, the system yield is increased, and the system power consumption is reduced.
Disclosure of Invention
The invention aims to overcome the problems and provides an external circulation system of a raw meal vertical mill.
In order to achieve the purpose, the method adopted by the invention is as follows: a raw material vertical mill external circulation system comprises a batching belt conveyor, a lifter, a feeding and conveying mechanism, a feeding tee joint, a V-shaped powder concentrator, an external circulation roller type vertical mill, a cyclone cylinder, a circulating fan and a dust remover; the external circulation roller type vertical mill comprises a grinding cylinder body at the lower part and a powder selecting cylinder body at the upper part, a mill is arranged in the grinding cylinder body, a powder selecting machine is arranged in the powder selecting cylinder body, the grinding cylinder body and the powder selecting cylinder body are separated by a partition plate, and an outlet of a powder selecting coarse powder ash hopper of the powder selecting machine penetrates through the partition plate and extends into the grinding cylinder body; the batching belt conveyor feeds the batching into the feeding and conveying mechanism above through a lifter, the feeding and conveying mechanism feeds materials through a feeding tee joint, one end of the feeding tee joint is connected with the feeding and conveying mechanism, the other end of the feeding tee joint is externally arranged, and the other end of the feeding tee joint is connected with a feeding hole of the V-shaped powder concentrator; the V-shaped powder concentrator is used for primary selection of mixed materials, hot air is introduced into the V-shaped powder concentrator, a fine powder outlet of the V-shaped powder concentrator is connected with an air inlet cylinder of the powder concentrator on the upper part of the external circulation roller type vertical mill, and a coarse powder outlet of the V-shaped powder concentrator is connected with a small buffer bin and a feeding elevator and then connected with a primary feed inlet of the mill; the air outlet of the powder concentrator is connected with a cyclone, and the discharge end of the cyclone sends the materials into a finished product warehouse through a conveying mechanism; the discharge port of the mill is connected with a feeding elevator through a belt conveyor.
As an improvement of the invention, the lower part of the powder selecting cylinder is provided with an air inlet which is connected with a circulating fan and an air outlet of the V-shaped powder selecting machine.
As an improvement of the invention, an air-locking flap valve is arranged below the partition plate.
As an improvement of the invention, a coarse powder outlet of the V-shaped powder concentrator is connected with a feed inlet of the external circulation roller type vertical mill through a buffer bin and a lifter.
The invention also discloses a production process of the external circulation system of the raw material vertical mill, which comprises the following steps:
(1) the materials are proportioned on a batching belt conveyor, and the proportioned materials are sent to a feeding and conveying mechanism at the upper part through a hoister;
(2) the feeding and conveying mechanism feeds the ingredients into the V-shaped powder concentrator through the feeding tee joint for primary selection of mixed materials;
(3) introducing hot air into the V-shaped powder concentrator, scattering the materials, drying the moisture in the raw materials, primarily concentrating, bringing the primarily concentrated fine powder into the powder concentrator on the upper part of the external circulating roller type vertical mill through the air, and then sorting the materials to obtain finished products meeting the qualified fineness requirement through static air guide blades and a dynamic rotating cage; coarse powder primarily selected by the V-shaped powder selector is conveyed into a mill at the lower part of an external circulating roller type vertical mill through conveying equipment to be ground;
(4) fine powder containing qualified fineness requirement and discharged from an air outlet of the powder concentrator on the upper part of the external circulating roller type vertical mill is separated by a cyclone cylinder, and the collected fine powder is conveyed to a finished product warehouse for storage through conveying equipment;
(5) and the mill on the lower part of the external circulation roller type vertical mill grinds the coarse powder, discharges the coarse powder from a discharge port of the mill, and sends the coarse powder into a feeding elevator through a belt conveyor, and the process is circulated.
As an improvement of the invention, in the step (4), besides the gas separated by the cyclone cylinder circularly enters the powder concentrator, part of the gas also needs to be dedusted by a deduster, and then the solid is collected and sent to a finished product warehouse.
Has the advantages that:
the external circulation of the materials of the vertical mill can be realized through the process flow, the materials are not conveyed to the powder concentrator through pneumatic conveying for separation, and the materials are conveyed by the hoister in a centralized mechanical manner, so that the airflow resistance is greatly reduced, and the power consumption is greatly reduced. The powder selecting operation can utilize a powder selecting machine system at the upper part of the mill to select the powder, and the powder selecting machine is arranged above the mill, so that the civil engineering cost can be greatly reduced, and the equipment investment can be greatly saved. The materials to be sorted are roughly sorted by the V-shaped powder sorting machine before entering the powder sorting machine for sorting, so that the influence of large particles on the powder sorting machine is reduced, the hot air entering the V-shaped powder sorting machine is used for drying the raw materials, and the sorting efficiency of the powder sorting machine is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The numbers in the figure are: 29. a batching belt conveyor; 30. a feeding elevator; 31. a feeding and conveying mechanism; 32. a feeding tee joint; 33. a V-shaped powder concentrator; 34. a buffer bin; 35. discharging the belt grinding machine; 36. a feeding elevator; 37. roller type vertical mill; 38. a cyclone; 39. a circulating fan; 40. a bag type dust collector; 41. finished product air conveying chute; 42. warehousing a hoister; 43. and (5) a finished product warehouse.
FIG. 2 is a schematic structural view of an external circulation roll type vertical mill of the present invention.
The parts in the figure are: 1. An air outlet; 2. a speed reducer; 3. an electric motor; 4. an upper cylinder; 5. a main shaft assembly; 6. labyrinth sealing; 7. Wind guide blades; 8. rotating the cage; 9. selecting a powder cylinder; 10. a primary feed port; 11. a powder selecting coarse powder ash hopper; 12. an air inlet; 13. a partition plate; 14. a wind-locking flap valve; 15. grinding the roller; 16. a rocker arm; 17. a grinding disc; 18. a shaft seat support; 19. a nozzle ring; 20. a discharge loop; 21. a scraping plate; 22. a discharge port; 23. a speed reducer; 24. a main motor; 25. a hydraulic cylinder; 26. a grinding cylinder; 27. an air inlet cylinder; 28. the wind channel ring is restrained.
Fig. 3 is a view from direction a-a of fig. 2 in accordance with the present invention.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific examples, which are carried out on the premise of the technical solution of the present invention, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the embodiment discloses a raw material vertical mill external circulation system, which comprises a batching belt conveyor 29, a feeding elevator 30, a feeding conveying mechanism 31, a feeding tee 32, a V-shaped powder concentrator 33 and a buffer bin 34; a belt grinding machine 35; a feeding elevator 36, an external circulation roller type vertical mill 37, a cyclone 38, a circulating fan 39, a bag type dust collector 40, a finished product pneumatic conveying chute 41, a warehousing elevator 42 and a finished product warehouse 43.
The external circulation roller type vertical mill 37 comprises a grinding cylinder 26 at the lower part, an air inlet cylinder 27 and a powder selecting cylinder 9 at the upper part, a mill is arranged in the grinding cylinder 26, a powder selecting machine is arranged in the powder selecting cylinder 9, the grinding cylinder 26 and the air inlet cylinder 27 are separated by a partition plate, an outlet of a powder selecting coarse powder ash hopper of the powder selecting machine penetrates through the partition plate 13 and extends into the grinding cylinder 26, and the structure of the external circulation roller type vertical mill is specifically referred to the attached figure 2.
The batching belt conveyor 29 sends the batched materials into a feeding conveying mechanism 31 above through a feeding elevator 30, the feeding conveying mechanism 31 discharges materials through a feeding tee 32, one end of the feeding tee 32 is connected with the feeding conveying mechanism 31, one end of the feeding tee is externally discharged, and the other end of the feeding tee is connected with a feeding hole of a V-shaped powder concentrator 33.
The V-shaped powder concentrator 33 is used for primary selection of mixed materials, hot air is introduced into the V-shaped powder concentrator 33, a fine powder outlet of the V-shaped powder concentrator 33 is connected with a powder concentrator air inlet cylinder 27 at the upper part of the external circulation roller type vertical mill 37, and a coarse powder outlet of the V-shaped powder concentrator 33 is connected with a mill primary feed inlet 10 at the lower part of the external circulation roller type vertical mill 37 through a buffer bin 34 and a feed elevator 36.
The air outlet 1 of the powder concentrator is connected with a cyclone 38, and the material is sent to a finished product warehouse 43 by the discharge end of the cyclone 38 through an air delivery chute 41 and a warehousing elevator 42; the discharge port 22 of the mill is connected with a feeding elevator 30 through a grinding belt conveyor 35.
The process of the external circulation system of the raw material vertical mill comprises the following steps:
(1) the materials of all components are proportioned on a batching belt conveyor 29, and the proportioned materials are sent to a feeding and conveying mechanism 31 at the upper part through a feeding elevator 30;
(2) the feeding and conveying mechanism 31 feeds the ingredients into a V-shaped powder concentrator 33 through a feeding tee joint 32 for primary selection of mixed materials;
(3) introducing hot air into a V-shaped powder concentrator 33, scattering the materials, drying the moisture in the raw materials, performing primary concentration, bringing the primarily-selected fine powder into the powder concentrator on the upper part of the external circulating roller type vertical mill 37 through air, and then sorting the materials to obtain finished products meeting the qualified fineness requirement through static air guide blades 7 and a dynamic rotating cage 8 in the powder concentrator; coarse powder primarily selected by the V-shaped powder concentrator is fed into a primary feed inlet 10 of an external circulation roller type vertical mill 37 through a buffer bin 34 and a feed elevator 36 and enters the mill for grinding.
(4) The fine powder containing qualified fineness requirement and discharged from the air outlet 1 of the powder concentrator on the upper part of the external circulating roller type vertical mill 37 is separated by a cyclone 38, and then the fine powder is collected and enters a warehousing elevator 42 through a raw material finished product air conveying chute 41; the gas from the cyclone 38 is partly recirculated by a recirculation fan 39, and the recirculated gas is again fed into the mill for air separation. Part of the gas separated by the cyclone 38 needs to be dedusted by a deduster 40, and the fine powder is collected and sent to a finished product warehouse.
(5) And a mill on the lower part of the external circulation roller type vertical mill 37 grinds the coarse powder, discharges the coarse powder from a mill discharge port 22, and sends the coarse powder into a feeding elevator 36 through a discharge mill belt conveyor 35, and the circulation is carried out.
The external circulation of the materials of the vertical mill can be realized through the process flow, the materials are not conveyed to the powder separator for separation through internal pneumatic conveying any more, the materials are conveyed by a lifter centralized machinery, the airflow resistance is greatly reduced, and the power consumption is greatly reduced. The powder selecting operation can utilize a powder selecting machine system above the mill to select the powder, and the powder selecting machine is arranged above the vertical mill, so that the civil engineering cost can be greatly reduced, and the equipment investment can be greatly saved. The material to be sorted is roughly sorted by a V-shaped powder sorting machine before entering the powder sorting machine for sorting, so that the influence of large particles on the powder sorting machine is reduced, the hot air entering the V-shaped powder sorting machine is used for drying the raw material, the drying operation is completed, and the sorting efficiency of the powder sorting machine is improved.
As shown in FIG. 2, the external circulation roller type vertical mill of the present invention comprises a mill housing, a grinding disc 17 and a grinding roller 15 are arranged in the mill housing, a powder concentrator is arranged on the upper part of the mill housing, the grinding disc 17 is mounted on a speed reducer 23, and a main motor 24 provides power for the speed reducer 23. The grinding rollers 15 are arranged on the shaft seat support 18 through the rocker arm 16 and are evenly distributed on the periphery of the mill shell in equal parts. The rocker arm 16 is also connected to a hydraulic ram 25.
An annular partition plate 13 is arranged at the middle upper part of the mill shell to divide the mill shell into a grinding cylinder 26 and a powder selecting cylinder 27, and an air locking flap valve 14 is arranged below the partition plate 13. A powder selecting machine is arranged in the powder selecting cylinder 9, an outlet of a powder selecting coarse powder ash bucket 11 of the powder selecting machine penetrates through the annular partition plate 13 and extends into the grinding cylinder 26, and an outlet of the powder selecting coarse powder ash bucket 11 corresponds to the center of the grinding disc 17.
An air inlet cylinder 27 is arranged at the lower part of the powder selecting cylinder 9, an air inlet 12 is arranged at the periphery of the air inlet cylinder 27, in the embodiment, two or more air inlets 12 are arranged, the air inlets 12 are connected with an air outlet of a circulating fan 33 and a V-shaped powder selecting machine 34, gas required by powder selection enters from the air inlets 12, and a restraining air duct ring is arranged at the inner side of the air inlet cylinder 27 and used for smooth gas flow in the air inlet cylinder 27.
The grinding disc 17 and the grinding roller 15 are arranged at the lower part of the grinding cylinder 26, a nozzle ring 19 is arranged between the outer circumference of the grinding disc 17 and the grinding mill shell, a discharge ring channel 20 is arranged at the lower part of the nozzle ring 19, a discharge hole 22 is also arranged at the bottom of the discharge ring channel 20, scraping plates 21 are arranged around the grinding disc, and materials are scraped to the discharge hole 22 at the lower part by the scraping plates 21 and then discharged out of the grinding mill. The discharge port 22 is also provided with a material conveying mechanism which conveys materials into the V-shaped powder concentrator 34 for rough concentration, and the rough materials after rough concentration are connected with the primary feed port 10 of the mill by a buffer bin 35 and a feed elevator 37.
The rotating cage 8 in the powder concentrator is connected with a speed reducer 2 of the powder concentrator through a main shaft assembly 5, the speed reducer 2 is driven by a main shaft transmission motor 3, and the transmission device is arranged on the upper cylinder 4.
A labyrinth seal 6 is arranged at the upper part of the rotary cage 8 to separate the material entering the powder selecting area from the interior of the rotary cage 8.
The specific working process of the external circulation roller type vertical mill comprises the following steps:
large-particle materials to be ground and coarse powder separated by a V-shaped powder separator 34 enter from a primary feed inlet 10 after being conveyed, and enter a mill together with the separated coarse powder in a powder separation coarse powder ash hopper 11 for grinding, the materials are in a grinding cylinder 26, a mill transmission part consisting of a main motor 24 and a speed reducer 23 drives a grinding disc 17 to rotate, the materials in the middle move outwards under the action of rotating centrifugal force and are rolled in a region between the grinding disc 17 and a grinding roller 15, the grinding roller 15 exerts grinding pressure downwards under the action of a hydraulic oil cylinder 25, a rocker arm 16 and an axle seat support 18, the rolled materials move outwards to turn over a material stop ring, fall into a discharge ring channel 20 through a nozzle ring 19, and are scraped to a discharge port 22 through a scraping plate 21 arranged at the lower part of the grinding disc.
The fine powder separated by the V-shaped powder separator 34 is carried by gas, enters the powder separator through the air inlet 12 of the air inlet cylinder 27, enters an annular powder separation area formed by the air guide blades 7 and the rotating cage 8 through the air guide blades 7, and the rotating cage 8 rotates under the driving of the motor 3, the belt reducing machine 2 and the main shaft assembly 5 on the upper part of the powder separator to separate the entering materials.
The annular powder selecting area is contained in a powder selecting cylinder 9, an air inlet cylinder 27 is arranged at the lower part of the powder selecting cylinder 9, two or more air inlets 12 are arranged on the air inlet cylinder 27, gas required by powder selection enters from the air inlets 12, airflow entering the air inlet cylinder 27 rotates upwards and enters the powder selecting area through an air guide blade 7, the entering materials are selected along with the rotation of a rotating cage 8, coarse particles cannot enter the rotating cage 8 of the powder selecting machine due to large mass and large centrifugal force, the coarse particles fall into a powder selecting coarse powder hopper 11 and are fed into a grinding machine together with large particles entering from a primary feed port 10 for grinding, fine powder in the powder selecting area is sucked by gas due to small mass and small centrifugal force, enters the rotating cage 8 and moves upwards into an upper cylinder 4, and then exits from an air outlet 1 and enters a subsequent cyclone cylinder 38, and gas-solid separation is carried out, the fine powder is collected, the gas enters the circulating fan behind the cyclone 38, one part of the gas enters the air inlet 12 again for the next round of separation, and the other part of the gas enters a dust remover for collecting the fine powder.
The gas flow for powder separation is supplied by a circulating fan 39, and a gas flow field is formed inside the powder separator.
A labyrinth seal 6 is arranged at the upper part of the rotating cage 8, so that materials entering a powder selecting area are separated from the inside of the rotating cage 8, and the condition that coarse particles diffused in gas at the position are not separated and directly enter the inside of the rotating cage to cause powder selection to run coarse is prevented.
Several air-locking flap valves 14 are arranged under the partition plate 13 at the lower part of the air inlet cylinder body and are mainly used for preventing materials from being accumulated on the partition plate at the lower part of the air inlet cylinder body 27 due to the change of the air speed, and if the materials are accumulated, the materials are discharged into the mill by the air-locking flap valves 14 at the position for grinding.
The technical means disclosed by the scheme of the invention are not limited to the technical means disclosed by the technical means, and the technical scheme also comprises the technical scheme formed by any combination of the technical characteristics. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (4)
1. The utility model provides a raw material grinds outer circulation system immediately which characterized in that: the device comprises a batching belt conveyor, a feeding elevator, a feeding conveying mechanism, a feeding tee joint, a V-shaped powder concentrator, a feeding elevator, an external circulating roller type vertical mill, a cyclone cylinder, a circulating fan and a dust remover; the external circulation roller type vertical mill comprises a grinding cylinder body at the lower part and a powder selecting cylinder body at the upper part, a mill is arranged in the grinding cylinder body, a powder selecting machine is arranged in the powder selecting cylinder body, the grinding cylinder body and the powder selecting cylinder body are separated by a partition plate, and an outlet of a powder selecting coarse powder ash hopper of the powder selecting machine penetrates through the partition plate and extends into the grinding cylinder body; the batching belt conveyor feeds the batching into the feeding and conveying mechanism above through the feeding elevator, the feeding and conveying mechanism feeds materials through the feeding tee joint, one end of the feeding tee joint is connected with the feeding and conveying mechanism, the other end of the feeding tee joint is arranged outside the feeding tee joint, and the other end of the feeding tee joint is connected with a feeding hole of the V-shaped powder concentrator; the V-shaped powder concentrator is used for primary selection of mixed materials, hot air is introduced into the V-shaped powder concentrator, a fine powder outlet of the V-shaped powder concentrator is connected with an air inlet of an air inlet cylinder of the powder concentrator on the upper part of the external circulation roller type vertical mill, and a coarse powder outlet of the V-shaped powder concentrator is connected with a feeding elevator of the external circulation roller type vertical mill; an air outlet of the powder concentrator above the vertical mill is connected with a cyclone, and a discharge end of the cyclone sends materials into a finished product warehouse through conveying equipment; the discharge port of the mill is connected with the feeding elevator through a grinding belt machine.
2. The external circulation system of the raw meal vertical mill as claimed in claim 1, wherein: the lower part of the powder selecting cylinder is provided with an air inlet which is connected with the air outlet of the V-shaped powder selecting machine and the air outlet of the circulating fan.
3. The external circulation system of the raw meal vertical mill as claimed in claim 1, wherein: and an air-locking flap valve is arranged below the partition plate.
4. The external circulation system of the raw meal vertical mill as claimed in claim 1, wherein: and a coarse powder outlet of the V-shaped powder concentrator is connected with a feed inlet of the external circulating roller type vertical mill through a buffer bin and a lifter.
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| CN201921973193.3U CN211463353U (en) | 2019-11-15 | 2019-11-15 | External circulation system of raw material vertical mill |
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| CN201921973193.3U CN211463353U (en) | 2019-11-15 | 2019-11-15 | External circulation system of raw material vertical mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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