CN211913990U - External circulation roller type vertical mill - Google Patents
External circulation roller type vertical mill Download PDFInfo
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- CN211913990U CN211913990U CN201921973041.3U CN201921973041U CN211913990U CN 211913990 U CN211913990 U CN 211913990U CN 201921973041 U CN201921973041 U CN 201921973041U CN 211913990 U CN211913990 U CN 211913990U
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Abstract
The invention discloses an external circulation roller type vertical mill, wherein a separating plate is arranged at the middle upper part of a mill shell to separate the mill shell into a grinding cylinder and a powder selecting cylinder; a powder selecting machine is arranged in the powder selecting cylinder, 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, and an air inlet is arranged at the lower part of the powder selecting cylinder; the grinding disc and the grinding roller are arranged at the lower part of the grinding cylinder, a nozzle ring is arranged between the outer circumference of the grinding disc and the grinding mill shell, a discharge ring is arranged at the lower part of the nozzle ring, a discharge hole is also arranged at the bottom of the discharge ring, and the material is fed into a feeding pipe of a powder selecting machine in the powder selecting cylinder at the discharge hole through a material lifting mechanism. The invention thoroughly changes the mode of conveying materials by pneumatic power into an efficient mechanical centralized conveying mode, can greatly save energy consumption, saves space and greatly saves civil engineering cost because two independent grinding systems and a sorting system are organically combined together.
Description
Technical Field
The invention relates to a material bed grinding device, in particular to an external circulation roller type vertical mill.
Background
In the grinding production operation, a large amount of coarse particles are ground into fine powder, and the particles in the fine powder are separated according to a certain particle size to form a qualified product. These grinding devices are grinding devices. The common grinding equipment at present comprises a tube mill, a roller press and a roller vertical mill. The roller press and the roller vertical mill belong to material bed grinding equipment, and the grinding efficiency of the roller press and the roller vertical mill is higher than that of a tube mill, so the roller press and the roller vertical mill are widely applied to grinding operation.
The roller vertical mill is a grinding machine for grinding materials by using the principle of bed grinding, and is widely applied to the industries of cement, coal, electric power, metallurgy, mineral separation and the like. At present, a common vertical mill is a full-air-swept mill, materials are crushed through the relative motion of a grinding roller and a grinding disc, the ground materials are dried by hot air and are upwards taken into a powder concentrator, the powder concentrator classifies the materials in the mill, and coarse powder falls into the grinding disc to be crushed again; the finished product is sent out of the mill by airflow and collected by a dust collector. The specific process comprises the following steps: the grinding materials are extruded, the materials fall to the position of the nozzle ring from the edge of the grinding disc under the action of centrifugal force along with the rotation of the grinding disc, the materials are blown up by high-speed cyclone wind at the position and blown away, and metal and heavy ores are settled to the position below the nozzle ring and are discharged. The fine powder is carried to the upper part of the vertical mill, separated by a powder separator, and the finished product enters a dust collector along with gas to be collected. The separated coarse grains fall into the grinding disc for grinding again, the high-speed rotational flow wind at the nozzle ring throws the coarse grains, the coarse grains gradually lose support and settle on the grinding disc along with the reduction of the wind speed in the rising process, and the coarse grains enter the grinding area of the grinding roller and the grinding disc for grinding again by virtue of centrifugal force. Thus, over multiple cycles, heat transfer between the particles and the gas vaporizes the water.
The vertical mill is composed of six parts, namely a machine shell and a machine base, a grinding roller and a grinding disc, a pressurizing device, a grading device, a transmission device and a lubricating system.
The roller type vertical mill is a full air swept mill, materials ground out between a grinding roller and a millstone are blown and dispersed at a nozzle ring by high-speed gas and lifted upwards, thicker particles are blown upwards by the nozzle ring, part of the materials are always in a suspension state due to the action of gravity under the action of high-speed airflow from bottom to top in the falling process, part of the materials fall onto the millstone in the lifting process and fall off from the edge of the millstone and are blown by the airflow at the nozzle ring, so a large amount of internal circulation is formed, the concentration of dust in the internal circulation is too high, the airflow resistance moving upwards is large, the air speed at the nozzle ring is high, the resistance is also high, the whole pressure difference of the vertical mill is generally high and is generally between 7000 and 10000Pa, the large resistance is large, and a large amount of materials are brought from bottom to top by the action of pneumatic force, and a large amount of energy consumption is required, the rise of energy consumption is directly increased.
The fine material in the mill is carried by gas and enters the powder separator upwards for classification, the separated coarse powder falls into the inner ash bucket and enters the millstone for re-grinding, and the required fine powder (finished product) enters the subsequent dust remover along with the gas for gas-solid separation. Because all materials need to be lifted and transported by gas, and the air channel of the gas in the vertical mill body is in an irregular channel, various phenomena such as vortex and the like exist, the air speed is high, the resistance is large, in the actual production, because a large amount of powder materials need to be lifted, the dust concentration on the mill is very high, the gas resistance is large, and in the material lifting process, if the fluctuation of the air volume of a system is met, the balance of the gas pressure is broken, the phenomena such as collapse and the like of suspended materials can be caused, and the grinding roller is abnormally vibrated and is jumped and stopped. This way of conveying the material by means of gas lift consumes a lot of energy and also brings other unstable factors.
Disclosure of Invention
The invention aims to overcome the problems and provides an external circulation roller type vertical mill.
In order to achieve the purpose, the method adopted by the invention is as follows: an external circulation roller type vertical mill comprises a mill shell, wherein a grinding disc and a grinding roller are arranged in the mill shell, a powder concentrator is arranged at the upper part of the mill shell, and a partition plate is arranged at the middle upper part of the mill shell to divide the mill shell into a grinding cylinder and a powder concentrating cylinder; a powder selecting machine is arranged in the powder selecting cylinder, 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, and an air inlet is arranged at the lower part of the powder selecting cylinder; the grinding disc and the grinding roller are arranged at the lower part of the grinding cylinder, a nozzle ring is arranged between the outer circumference of the grinding disc and the grinding machine shell, a discharge ring channel is arranged at the lower part of the nozzle ring, a discharge hole is also arranged at the bottom of the discharge ring channel, a material lifting mechanism is also arranged at the discharge hole, and the material lifting mechanism sends materials to a powder selecting machine in the powder selecting cylinder and is connected with a feeding pipe of the powder selecting machine.
As an improvement of the invention, an air-locking flap valve is arranged below the partition plate and is used for discharging possible accumulated materials at an air inlet on the partition plate into the grinding barrel.
As an improvement of the invention, scraping plates are arranged around the grinding disc, and the materials are scraped to a discharge hole at the lower part by the scraping plates and are discharged out of the grinding disc.
As an improvement of the invention, one or more air inlets are arranged on the air inlet cylinder body, and gas required by powder selection enters from the air inlets.
As an improvement of the invention, the grinding disc is arranged on the speed reducer, and the main motor provides power for the speed reducer.
As an improvement of the invention, a rotating cage in the powder concentrator is connected with a speed reducer of the powder concentrator through a main shaft assembly, the speed reducer is driven by a main shaft transmission motor, and the transmission device is arranged on a cylinder body at the upper part.
As an improvement of the invention, a sealing mechanism is arranged at the upper part of the rotary cage to separate the material entering the powder selecting machine on the material spreading disc from the interior of the rotary cage.
As an improvement of the invention, the grinding roller is arranged on the shaft seat bracket through a rocker arm and is evenly distributed on the periphery of the mill shell in an equal distribution manner.
As an improvement of the invention, the rocker arm is also connected with a hydraulic oil cylinder, and acting force is applied to the grinding roller through the hydraulic oil cylinder.
As an improvement of the invention, the outlet of the powder selecting coarse powder ash bucket corresponds to the center of the grinding disc.
Has the advantages that:
the invention divides the mill and the powder selecting machine by arranging the partition plate, the powder selecting machine on the upper part forms an independent system and is only positioned on the upper part of the mill body, so that the coarse material after powder selection can directly enter the mill disc for grinding again; the grinding roller and the grinding disc below operate according to the original system, the material ground by the grinding machine is not taken to the powder selecting machine by gas any more, but is scraped out by the scraper below, and is sent into the powder selecting machine above through the belt conveyor and the elevator for sorting. All materials are conveyed from the outside in a high efficiency way to form an external circulation system and form an external circulation roller type vertical mill, the working principle is changed into a mode of conveying the materials by air completely, and is changed into a high-efficiency mechanical centralized conveying mode, so that the energy consumption can be greatly saved, and because two independent grinding systems and a sorting system are organically combined together, the space is saved, and the civil engineering cost is greatly saved. Due to the change of the air inlet mode of the powder concentrator, air can be conveniently introduced according to the peripheral conditions, the peripheral equipment is convenient to have a negative pressure state, and the clean production of the peripheral equipment is facilitated.
Drawings
FIG. 1 is a schematic structural diagram 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. a feed pipe; 7. labyrinth sealing; 8. a material spreading disc; 9. a striker plate; 10. wind guide blades; 11. rotating the cage; 12. selecting a powder cylinder; 13. a primary feed port; 14. a powder selecting coarse powder ash hopper; 15. an air inlet; 16. a partition plate; 17. a wind-locking flap valve; 18. grinding the roller; 19. a rocker arm; 20. a grinding disc; 21. a shaft seat support; 22. a nozzle ring; 23. a discharge loop; 24. a scraping plate; 25. a discharge port; 26. a speed reducer; 27. a main motor; 28. a hydraulic cylinder; 29. a grinding cylinder; 30. an air inlet cylinder.
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.
Example 1:
the external circulation roller type vertical mill as shown in figure 1 comprises a mill shell, a grinding disc 20 and a grinding roller 18 are arranged in the mill shell, a powder concentrator is arranged at the upper part of the mill shell, the grinding disc 20 is arranged on a speed reducer 26, and a main motor 27 supplies power to the speed reducer 26. The grinding rollers 18 are arranged on the shaft seat support 21 through the rocker arm 19 and are evenly distributed on the periphery of the mill shell in equal parts. The rocker arm 19 is also connected to a hydraulic ram 28.
An annular partition plate 16 is arranged at the middle upper part of the mill shell to divide the mill shell into a grinding cylinder 29 and a powder selecting cylinder 30, and an air locking flap valve 17 is arranged below the partition plate 16. A powder selecting machine is arranged in the powder selecting cylinder 30, the outlet of a powder selecting coarse powder ash bucket 14 of the powder selecting machine penetrates through the annular partition plate 16 and extends into the grinding cylinder 29, and the outlet of the powder selecting coarse powder ash bucket 14 corresponds to the center of the grinding disc 20.
The lower part of the powder selecting cylinder body is provided with one or more air inlets 15, in the embodiment, the air inlets 15 are connected with a circulating fan, and the gas required by powder selection enters from the air inlets 15.
The grinding disc 20 and the grinding roller 18 are arranged at the lower part of the grinding cylinder 29, a nozzle ring 22 is arranged between the outer circumference of the grinding disc 20 and the grinding mill shell, a discharge ring channel 23 is arranged at the lower part of the nozzle ring 22, a discharge hole 25 is also arranged at the bottom of the discharge ring channel, scraping plates 24 are arranged around the grinding disc, and materials are scraped to the discharge hole 25 at the lower part by the scraping plates 24 and are discharged out of the grinding mill. A material lifting mechanism is also arranged at the discharge port 25 and used for conveying materials to the powder concentrator in the powder concentrator barrel 30 and is connected with the feeding pipe 6 of the powder concentrator.
The rotating cage 11 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 cylinder 4 at the upper part.
The upper part of the rotary cage 11 is provided with a labyrinth seal 7 which separates the material entering the powder selecting machine on the material spreading disc 8 from the interior of the rotary cage 11.
The specific working process is as follows:
large-particle materials to be ground enter from a primary feed inlet 13 and enter the mill together with the sorted coarse powder in the coarse powder selecting ash hopper 14 for grinding, the materials are in a grinding cylinder 29, a mill transmission part consisting of a main motor 27 and a speed reducer 26 drives a grinding disc 20 to rotate, the materials in the middle move outwards under the action of centrifugal force and move to the area between the grinding disc 20 and a grinding roller 18 for grinding, the grinding roller 18 downwards applies grinding pressure under the action of a hydraulic oil cylinder 28, a rocker arm 19, a hydraulic oil cylinder 28 and a shaft seat support 21, the ground materials move outwards to turn out a material blocking ring at the edge of the grinding disc, fall into a discharge ring channel 23 through a nozzle ring 22, and are scraped to a discharge port 25 through a scraping plate 24 arranged on the grinding disc.
The material outlet 25 enters a peripheral belt conveyor to be conveyed out, the material is conveyed to the material inlet pipe 6 through a lifting device and enters a material scattering disk 8 of the upper powder concentrator, the material scattering disk 8 is arranged on a rotating cage 11, the rotating cage 11 is driven by a motor 3, a speed reducer 2 and a main shaft assembly 5 on the upper portion of the powder concentrator to rotate, the fed material is scattered to a peripheral baffle plate 9 and falls into a powder concentration area consisting of air guide blades 10 and rotating cage 11 blades.
The powder selecting area is contained in a powder selecting cylinder 12, an air inlet cylinder 30 is arranged at the lower part of the powder selecting cylinder, one or more air inlets 15 are arranged on the air inlet cylinder 30, gas required by powder selection enters from the position, airflow entering the air inlet cylinder 30 rotates upwards, enters the powder selecting area through an air guide vane 10, the entered material is selected, coarse particles cannot enter a rotating cage 11 of the powder selecting machine due to large mass and large centrifugal force, the coarse particles fall into a coarse powder selecting ash hopper 14 and are fed into a mill together with large particles entering a primary feed port 13 for grinding, fine powder in the powder selecting area is carried into the rotating cage 11 by gas due to small mass and small centrifugal force, the fine powder moves upwards into an upper cylinder 4 and goes out from an air outlet 1 to enter subsequent dust removing equipment to separate gas from the gas and the gas, the fine powder is collected, and the gas enters a circulating fan behind the dust removing equipment and is discharged into the atmosphere or circulates into the air inlets 15 again, entering the next round of sorting.
The airflow for powder selection is supplied by a circulating fan, and a gas flow field is formed in the powder selector.
The labyrinth seal 7 is arranged at the upper part of the rotary cage 11, so that materials entering the powder selecting machine on the material spreading disc 8 are separated from the inside of the rotary cage 11, and the condition that the materials at the position are not selected and directly enter the rotary cage to cause the coarse powder selection is prevented.
Several air-locking flap valves 17 are arranged under the partition plate 16 at the lower part of the air inlet cylinder body and are mainly used for preventing the material accumulation on the partition plate 16 at the lower part of the air inlet cylinder body 30 due to the change of the air speed, and if the material accumulation exists, the material is discharged into the mill by the air-locking flap valves 17 at the position for grinding.
The invention divides the mill and the powder selecting machine by arranging the partition plate, the powder selecting machine on the upper part forms an independent system and is only positioned on the upper part of the mill body, so that the coarse material after powder selection can directly enter the mill disc for grinding again; the grinding roller and the grinding disc below operate according to the original system, the material ground by the grinding machine is not taken to the powder selecting machine by gas any more, but is scraped out by the scraper below, and is sent into the powder selecting machine above through the belt conveyor and the elevator for sorting. All the ground materials are conveyed from the outside with high efficiency to form an external circulation system and form an external circulation roller type vertical mill, the mode of conveying the materials by air is thoroughly changed from the working principle to an efficient mechanical centralized conveying mode, the energy consumption can be greatly saved, and the space and the civil engineering cost are greatly saved because two independent grinding systems are organically combined with a sorting system. Due to the change of the air inlet mode of the powder concentrator, air can be conveniently introduced according to the peripheral conditions, the peripheral equipment is convenient to have a negative pressure state, and the clean production of the peripheral equipment is facilitated.
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 (10)
1. The utility model provides an outer loop roll-type vertical mill, includes the mill casing in be provided with mill dish and grinding roller, be provided with powder concentrator on mill casing upper portion, its characterized in that: a separating plate is arranged at the middle upper part of the mill shell to separate the mill shell into a grinding cylinder and a powder selecting cylinder; a powder selecting machine is arranged in the powder selecting cylinder, 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, and an air inlet is arranged at the lower part of the powder selecting cylinder; the grinding disc and the grinding roller are arranged at the lower part of the grinding cylinder, a nozzle ring is arranged between the outer circumference of the grinding disc and the grinding machine shell, a discharge ring channel is arranged at the lower part of the nozzle ring, a discharge hole is also arranged at the bottom of the discharge ring channel, a material lifting mechanism is also arranged at the discharge hole, and the material lifting mechanism sends materials to a powder selecting machine in the powder selecting cylinder and is connected with a feeding pipe of the powder selecting machine.
2. An external circulation roller type vertical mill according to claim 1, wherein: and an air-locking flap valve is arranged below the partition plate.
3. An external circulation roller type vertical mill according to claim 1, wherein: and scraping plates are arranged around the grinding disc and scrape the materials to a discharge hole at the lower part, so that the materials are discharged out of the grinding machine.
4. An external circulation roller type vertical mill according to claim 1, wherein: the powder selecting cylinder is provided with one or more air inlets, and gas required by powder selection enters from the air inlets.
5. An external circulation roller type vertical mill according to claim 1, wherein: the grinding disc is arranged on the speed reducer, and the main motor provides power for the speed reducer.
6. An external circulation roller type vertical mill according to claim 1, wherein: the rotating cage inside the powder concentrator is connected with a speed reducer of the powder concentrator through a main shaft assembly, the speed reducer is driven by a main shaft transmission motor, and the transmission device is installed on the cylinder body at the upper part.
7. An external circulation roller type vertical mill according to claim 6, wherein: the upper part of the rotary cage is provided with a sealing mechanism which separates the material entering the powder selecting machine on the material spreading plate from the interior of the rotary cage.
8. An external circulation roller type vertical mill according to claim 1, wherein: the grinding roller is arranged on the shaft seat support through the rocker arm and is evenly distributed on the periphery of the grinding machine shell in an equal distribution mode.
9. An external circulation roller type vertical mill according to claim 8, wherein: the rocker arm is also connected with a hydraulic oil cylinder, and acting force is applied to the grinding roller through the hydraulic oil cylinder.
10. An external circulation roller type vertical mill according to claim 1, wherein: the outlet of the powder selecting coarse powder ash bucket corresponds to the center of the grinding disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921973041.3U CN211913990U (en) | 2019-11-15 | 2019-11-15 | External circulation roller type vertical mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921973041.3U CN211913990U (en) | 2019-11-15 | 2019-11-15 | External circulation roller type vertical mill |
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| CN211913990U true CN211913990U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921973041.3U Active CN211913990U (en) | 2019-11-15 | 2019-11-15 | External circulation roller type vertical mill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113000133A (en) * | 2021-03-03 | 2021-06-22 | 西安建筑科技大学 | Stripping and grinding machine for separating iron particles and silicate minerals in steel slag and using method thereof |
| CN113399054A (en) * | 2021-06-24 | 2021-09-17 | 阳新娲石水泥有限公司 | Vertical roller mill capable of stabilizing material layer and improving grinding efficiency and roller milling method |
| CN114643108A (en) * | 2022-04-02 | 2022-06-21 | 天津水泥工业设计研究院有限公司 | Millstone material control device based on vertical roller mill |
-
2019
- 2019-11-15 CN CN201921973041.3U patent/CN211913990U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113000133A (en) * | 2021-03-03 | 2021-06-22 | 西安建筑科技大学 | Stripping and grinding machine for separating iron particles and silicate minerals in steel slag and using method thereof |
| CN113399054A (en) * | 2021-06-24 | 2021-09-17 | 阳新娲石水泥有限公司 | Vertical roller mill capable of stabilizing material layer and improving grinding efficiency and roller milling method |
| CN113399054B (en) * | 2021-06-24 | 2023-09-12 | 阳新娲石水泥有限公司 | Vertical roller mill capable of stabilizing material layer and improving grinding efficiency and roller milling method |
| CN114643108A (en) * | 2022-04-02 | 2022-06-21 | 天津水泥工业设计研究院有限公司 | Millstone material control device based on vertical roller mill |
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