CN210304010U - Raw material external circulation final grinding system using self-screening vertical mill - Google Patents
Raw material external circulation final grinding system using self-screening vertical mill Download PDFInfo
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- CN210304010U CN210304010U CN201920768847.2U CN201920768847U CN210304010U CN 210304010 U CN210304010 U CN 210304010U CN 201920768847 U CN201920768847 U CN 201920768847U CN 210304010 U CN210304010 U CN 210304010U
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Abstract
The utility model relates to a raw material external circulation final grinding system using a vertical mill with a self-screening function, belonging to the technical field of building material machinery, comprising a vertical mill, a vibrating screen, a lifter, a powder concentrator, a cyclone cylinder, a dust collector and a fan; the vertical mill is connected with the vibrating screen to form a circulating system; the vertical mill, the vibrating screen, the hoister and the powder concentrator are sequentially connected to form a second circulating system; the vertical mill, the vibrating screen, the hoister, the powder concentrator and the cyclone cylinder are sequentially connected to form a raw material final grinding system; the powder concentrator, the cyclone cylinder, the dust collector and the fan are sequentially connected to form a circulating system. The vertical mill is a vertical mill with a self-screening function and comprises a screening device, wherein the screening device is used for returning unground materials or large materials to a grinding disc for continuous grinding; the screening device is fixed on the material blocking ring and/or above the wind ring. The utility model discloses reduced and not ground the material and got into the lifting machine, reduced system's circulation load, the low system energy consumption reduces the workshop height, practices thrift investment cost.
Description
Technical Field
The utility model belongs to the technical field of building materials machinery, especially, relate to an use raw outer loop end grinding system from screening function vertical mill.
Background
In a traditional vertical mill, a grinding disc rotates, materials fall onto the grinding disc through a blanking inner cylinder, a grinding roller with certain pressure presses on the materials, and the grinding roller is driven to rotate due to the rotation of the grinding disc; the ground material is thrown out of the grinding disc under the action of the rotating centrifugal force of the grinding disc and enters an air ring, air moves upwards from the lower part of the air ring, the material is brought into a vertical mill powder separator under the action of wind power for classification, a fine particle finished product is selected, and a coarse particle directly returns to the grinding disc for continuous grinding, so that a closed cycle process is formed until the material is ground to be selected as a finished product.
The traditional vertical mill is widely applied to the fields of raw meal, coal, cement and the like, but the wind power lifting is higher than the mechanical lifting in power consumption, and the ventilation power consumption accounts for about 45% of the system power consumption. Therefore, the existing external circulation vertical mill system cancels wind power lifting of materials in the vertical mill, changes the wind power lifting into mechanical lifting outside the vertical mill, effectively reduces the resistance of a fan, and reduces the power consumption of the system by 20%.
Compared with the traditional vertical mill, the external circulation vertical mill separates the sorting function and the grinding function, directly throws out the materials ground by the grinding roller and the grinding disc, and then lifts the materials to a powder concentrator by a lifter for sorting; however, the grinding disc has a certain rotating speed, and 30% of materials on the grinding disc directly enter the elevator without being ground, so that the system has high circulating load and high power consumption of the elevator, and the powder selection efficiency, the yield improvement and the like are further influenced. Therefore, how to reduce the material which is not ground to enter the hoister and the cyclic load becomes a key problem of improving the production efficiency of the external-circulation vertical mill.
The solutions commonly used at present are: a baffle is added on the upper part of the material blocking ring to force the material to stay on the mill; or the grinding pressure is increased, and the grinding efficiency is improved; however, forcing the material to stay on the mill can cause the operating current of the external circulation vertical mill to increase, the energy consumption of unit products to increase, and the problem of material escape cannot be solved.
In summary, the problems of the prior art are as follows:
(1) the material escapes without being ground and enters the next working procedure;
(2) the ventilation and power consumption of the traditional vertical mill are high;
(3) the height of the workshop is high, and the investment cost is high.
Therefore, how to effectively reduce the material which is not ground to enter the next working procedure and reduce the power consumption of operation has important significance for the stable operation of the final grinding system.
Disclosure of Invention
The problem that exists to prior art, the utility model provides an use from the final grinding system of raw outer loop of screening function vertical mill, this system has reduced the material that does not grind and has got into the lifting machine, reduces system's circulation load, reduces raw grinding system energy consumption, reduces the workshop height, practices thrift investment cost.
The utility model is realized in such a way that the raw material external circulation final grinding system using the vertical mill with the self-screening function comprises a vertical mill, a vibrating screen, a hoisting machine, a dynamic powder concentrator and a cyclone cylinder; the vertical mill is connected with the vibrating screen to form a circulating system; the vertical mill, the vibrating screen, the hoister and the dynamic powder concentrator are sequentially connected to form a second circulating system; the vertical mill, the vibrating screen, the hoister, the dynamic powder concentrator and the cyclone are sequentially connected to form a raw material final grinding system;
grinding the material by a vertical mill with a self-screening function, finishing primary screening in the vertical mill, and discharging particles with the particle size of less than 10mm out of the mill; in the falling process of the material, secondary screening is carried out through a vibrating screen, fine powder (less than or equal to 2mm) after screening enters a lifter, and coarse particles return to the vertical mill for secondary grinding; the fine powder enters a dynamic powder separator through a lifter, the qualified products after separation enter a cyclone, finished product collection is carried out, and semi-finished product particles are ground again.
The vertical mill is a vertical mill with a self-screening function and comprises a screening device, wherein the screening device is used for retaining the unground materials or large materials on a grinding disc for continuous grinding; the screening device is fixed on the material blocking ring of the vertical mill and/or above the wind ring, and the screening device is a screening grid plate.
Through newly adding the screening device, large blocks and coarse particles which are not ground are prevented from being on the grinding disc, forced grinding is carried out, and the ground and screened materials are discharged outside the mill. Therefore, the escape rate of the unground materials is reduced, the escape quantity of the unground materials can be reduced from 30% to within 8%, the material circulation load is greatly reduced, and the production efficiency of the vertical mill is improved.
In the technical scheme, preferably, when the screening grid plate is fixed on the material retaining ring, the aperture of the grid hole of the screening grid plate is 60-90% of the maximum granularity of the newly-fed material, the area of the grid hole accounts for 65-95% of the area of the screening grid plate, and the ratio of the height of the screening grid plate to the height of the material retaining ring is 0.6-1.2.
The ground fine particles can pass through the sieving grid plate, and the large coarse particles which are not ground are prevented from being on the grinding disc to be forcibly ground, so that the grinding efficiency is improved.
In the above technical solution, it is further preferable that the screening grid plate is a single layer or multiple layers, when multiple layers are formed, one layer is fixed on the material blocking ring and is marked as a fixed layer, and the other layers except the fixed layer are fixed on the fixed layer by tying the screening grid plates of different layers with iron wires from the grid holes.
The grid holes of the screening grid plate can be made into a single layer or multiple layers, when multiple layers are adopted, the size of the aperture is mainly adjusted, namely the aperture is the largest when the multiple layers are overlapped and the aperture is the smallest when the multiple layers are staggered, the screening grid plate can be tied up and fixed by iron wires from the aperture when the multiple layers are arranged, and the screen is convenient to disassemble and adjust.
In the technical scheme, preferably, when the screening grid plate is fixed above the air ring, the screening grid plate is arranged obliquely, the inclined angle of the screening grid plate and the horizontal included angle of the vertical grinding disc are 15-65 degrees, and the aperture of the grid hole of the screening grid plate is 30-80% of the maximum particle size of a newly-fed material.
The material strikes the grid plate under the effect of centrifugal force, and the fine particle can pass through the screening grid plate, and the coarse particle then strikes the gridlines between the comb hole and rebounds back to the mill, grinds once more, reduces the escape of material, increases mill material volume, improves grinding efficiency to realize reducing cyclic load's effect, improve outer circulation and found mill production efficiency.
In the above technical scheme, it is further preferred that the upper edge of the screening grid plate is tightly attached to the inner side wall of the vertical mill shell, the screening grid plate is supported and fixed by a triangular bracket fixed on the vertical mill shell, and the lower edge of the screening grid plate extends to the outermost side of the material retaining ring of the vertical mill in the circumferential direction. The unground materials are prevented from escaping from the upper end and the lower end of the sieving grid plate.
In the above technical solution, preferably, the screening grid plate body is formed by a single grid plate or a plurality of grid plates. The grid plate is divided into a plurality of blocks, so that the installation, the disassembly and the maintenance are convenient.
In the above technical scheme, preferably, a retarding plate for reducing the initial speed of the material contact grinding disc is arranged on the discharging inner cylinder of the vertical mill, the retarding plate is in a sector ring shape, the outer ring of the retarding plate is fixed on the discharging inner cylinder, the radial length from the inner ring to the outer ring of the retarding plate is 0.3-0.6 times of the inner diameter of the discharging inner cylinder, and the included angle between the retarding plate and the discharging inner cylinder in the vertical direction is 15-65 degrees. The phenomenon that the materials falling onto the grinding disc are easily thrown out due to high initial speed is avoided.
In the above technical solution, it is further preferable that the number of the speed reducing plates is at least two, and each of the speed reducing plates is arranged in a staggered manner along the axial direction. The speed of the material in the falling process is gradually reduced, the retention time of the material on the grinding disc is increased, and the circulating load is reduced.
The material falls onto the millstone through the blanking inner cylinder, and more than two stages of material retarding plates are added in the inner cylinder because the material conveying belt and the millstone have certain height; the materials impact the retarding plate in the falling process in the charging barrel, the speed of the materials is gradually reduced in the falling process under the action of the retarding plate, and the initial speed of the materials contacting the grinding disc is reduced finally; the grinding disc rotates at a constant speed, the initial speed of material particles is reduced, the retention time of the material on the grinding disc is prolonged, the grinding efficiency is improved, the amount of the material which directly enters a sorting system without being ground is reduced, and the circulating load is reduced.
In the above technical solution, preferably, the raw material external circulation finish grinding system further includes a dust collector, the gas outlet of the cyclone is connected to the dust collector, and gas coming out of the cyclone passes through the dust collector, so as to further reduce dust content.
In the above technical solution, it is further preferable that the clean gas discharge port of the dust collector is connected to a fan, and the dynamic powder concentrator, the cyclone, the dust collector, and the fan are connected in sequence to form a circulation system. The purified gas discharged from the dust collector is reused and conveyed into the dynamic powder concentrator to supply air to the dynamic powder concentrator, so that energy is saved.
The raw material external circulation final grinding system using the self-screening function vertical mill is applied to cement grinding and food (such as coarse corn flour and wheat flour) processing.
Compared with the prior art, the utility model has the advantages and positive effect be:
1. the utility model discloses an outer circulation raw material grinds the final grinding system immediately, will grind and select separately the function, and the material after the grinding is selected separately through vibration screening earlier again to adopt the vertical mill that has from the screening function, finally accomplish the final grinding of raw material, guarantee system steady operation, the ventilation power consumption reduces 20%;
2. the utility model adopts the vertical mill with the self-screening function, which continuously keeps the unground materials on the mill, and the ground materials are separated by the separation system, thereby reducing the unground materials entering the next process, improving the grinding efficiency, saving the energy consumption of the system, reducing the circulating load and ensuring the stability of the system operation;
3. the vibrating screen adopts a mechanical screening mode to replace the functions of V separation scattering and wind separation in the combined powder concentrator, and the dynamic powder concentrator is directly selected, so that the ventilation power consumption is saved, the workshop height is greatly reduced, and the investment cost is saved.
4. The utility model relates to a reasonable system layout is simple, and energy-conserving effect is showing, has huge economic benefits.
Drawings
Fig. 1 is a schematic structural diagram of a raw material external circulation final grinding system provided by an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a vertical mill provided by an embodiment of the present invention;
fig. 3 is a schematic structural view of a screening grid plate fixed on a material retaining ring according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a sieving grid plate fixed above a wind ring according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a speed-reducing plate according to an embodiment of the present invention.
In the figure: 1. vertically grinding; 1-1, a screening grid plate fixed on a material blocking ring; 1-1-1, perforated strainer; 1-2, a screening grid plate fixed above the air ring; 1-2-1, grate holes; 1-3, a material blocking ring; 1-4, a triangular bracket; 1-5, vertically grinding the shell; 1-6, grinding disc; 1-7, a blanking inner cylinder; 1-7-1, a retarding plate; 1-8, wind ring; 2. vibrating screen; 3. a hoist; 4. a dynamic powder concentrator; 5. a cyclone; 6. a dust collector; 7. a fan.
Detailed Description
For further understanding of the contents, features and effects of the present invention, the following embodiments are exemplified and will be described in detail with reference to the accompanying drawings:
in the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", "horizontal", "vertical", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "multi-layer" means two or more layers, and "multi-block" means two or more blocks.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1 to 5, the present embodiment provides a raw material external circulation final grinding system using a vertical mill with a self-screening function, which includes a vertical mill 1, a vibrating screen 2, a lifter 3, a dynamic powder concentrator 4 and a cyclone 5; the vertical mill 1 and the vibrating screen 2 are connected to form a circulating system; the vertical mill 1, the vibrating screen 2, the hoister 3 and the dynamic powder concentrator 4 are sequentially connected to form a second circulating system; the vertical mill 1, the vibrating screen 2, the elevator 3, the dynamic powder concentrator 4 and the cyclone 5 are connected in sequence to form a raw material final grinding system.
Grinding the material by a vertical mill with a self-screening function, finishing primary screening in the vertical mill, and discharging particles with the particle size of less than 10mm out of the mill; in the falling process of the material, secondary screening is carried out through a vibrating screen, fine powder (less than or equal to 2mm) after screening enters a lifter, and coarse particles return to the vertical mill for secondary grinding; the fine powder enters a dynamic powder separator through a lifter, the qualified products after separation enter a cyclone, finished product collection is carried out, and semi-finished product particles are ground again.
The vertical mill 1 is a vertical mill with a self-screening function and comprises a screening device, wherein the screening device is used for retaining an unground material or a large material on a grinding disc for continuous grinding; the screening device is fixed on a material retaining ring 1-3 and/or above an air ring 1-8 of the vertical mill, the screening device is a screening grid plate, the screening grid plate comprises a screening grid plate body, and a plurality of grid holes are formed in the screening grid plate body. In specific implementation, if the screening grid plate fixed on the material blocking ring and the screening grid plate fixed above the air ring exist at the same time, the height of the upper edge of the screening grid plate fixed above the air ring is higher than that of the upper edge of the screening grid plate fixed on the material blocking ring, so that materials impacting the screening grid plate fixed above the air ring can better rebound to the grinding disc; from the viewpoint of production cost and efficiency, only one screening device can be adopted in use.
Through newly adding the screening device, large blocks and coarse particles which are not ground are prevented from being on the grinding disc, forced grinding is carried out, and the ground and screened materials are discharged outside the mill. Therefore, the escape rate of the unground materials is reduced, the escape quantity of the unground materials can be reduced from 30% to within 8%, the material circulation load is greatly reduced, and the production efficiency of the vertical mill is improved.
As a preferred embodiment, the screening grid plate 1-1 is fixed on the material retaining ring, the body of the screening grid plate 1-1 is cylindrical, the aperture of a grid hole 1-1-1 of the screening grid plate is 60-90% of the maximum granularity of a newly-fed material, the area of the grid hole 1-1-1 accounts for 65-95% of the area of the screening grid plate 1-1, and the height ratio of the height of the screening grid plate 1-1 to the height of the material retaining ring 1-3 is 0.6-1.2.
The aperture of the grate hole limits the particle size of the material which can pass through, and ensures that the large material can not pass through and is continuously left on the grinding disc to be ground; the area of the grid plate not only ensures the grain diameter of the material, but also ensures the throughput of the material and the mechanical strength of the grid plate; the height ratio of the screening grid plate to the height of the material blocking ring ensures that the function of the material blocking ring is unchanged, the height does not need to be excessively increased, and the screening grid plate can interfere with the grinding roller shaft after being too high. The ground fine particles can pass through the sieving grid plate, and the large coarse particles which are not ground are prevented from being on the grinding disc to be forcibly ground, so that the grinding efficiency is improved.
As a further preferable embodiment, the screening grid plate 1-1 is a single layer or a plurality of layers, when the screening grid plate is a plurality of layers, one layer is fixed on the material blocking ring 1-3 and is marked as a fixed layer, and the other layers except the fixed layer are fixed on the fixed layer by binding the screening grid plates of different layers from the grid holes 1-1-1 by iron wires.
The grid holes of the screening grid plate can be made into a single layer or multiple layers, when multiple layers are adopted, the size of the aperture is mainly adjusted, namely the aperture is the largest when the multiple layers are overlapped and the aperture is the smallest when the multiple layers are staggered, the screening grid plate can be tied up and fixed by iron wires from the aperture when the multiple layers are arranged, and the screen is convenient to disassemble and adjust.
The utility model discloses when the concrete implementation, screening comb board 1-1 can adopt and keep off the material ring 1-3 integrated into one piece, and the thickness of screening comb board 1-1 is less than the thickness of keeping off the material ring 1-3, and screening comb board 1-1 arranges along the outside of keeping off the material ring 1-3. Thereby protecting the screening grid plate from being deformed or damaged due to extrusion in the operation of the vertical mill. And a layer of wear-resistant material can be welded on the inner side surfaces of the material blocking rings 1-3, so that the wear resistance is improved.
As a preferred embodiment, the screening grid plate 1-2 is fixed above the air ring, the screening grid plate 1-2 is inclined, and the shape of the screening grid plate 1-2 body after the inclined arrangement is an inverted round platform shape. The inclined angle of the screening grid plate 1-2 and the horizontal included angle of the vertical grinding disc 1-6 are 15-65 degrees, and the aperture of the grid hole 1-2-1 of the screening grid plate is 30-80 percent of the maximum particle size of a newly-fed material.
The inclination angle of the sieving grid plate enables part of large particles to automatically roll back to the grinding disc under the action of gravity; the aperture of the grate hole limits the particle size of the material which can pass through, and ensures that large materials cannot pass through. The material strikes the grid plate under the effect of centrifugal force, and the fine particle can pass through the screening grid plate, and the coarse particle then strikes the gridlines between the comb hole and rebounds back to the mill, grinds once more, reduces the escape of material, increases mill material volume, improves grinding efficiency to realize reducing cyclic load's effect, improve outer circulation and found mill production efficiency.
As a further preferable embodiment, the upper edge of the screening grid plate 1-2 is tightly attached to the inner side wall of the vertical mill shell 1-5, the screening grid plate 1-2 is supported and fixed through a triangular bracket 1-4 fixed on the vertical mill shell, and the lower edge of the screening grid plate 1-2 extends to the circumferential outermost side of the material retaining ring 1-3 of the vertical mill. The material that does not grind is prevented from escaping from the upper and lower both ends of screening comb board, and when the screening comb board need to be changed, only the screening comb board is dismantled, and the renewal can.
As a preferred embodiment, the two screening grid plates 1-1 and 1-2 are composed of a single grid plate or a plurality of grid plates. The grid plate is divided into a plurality of blocks, so that the installation, the disassembly and the maintenance are convenient. And the grid holes of the screening grid plate can be made into any shape, such as round, long round hole shape, rectangle and the like, and can be selected according to the requirement in actual use.
As a preferred embodiment, a retarding plate 1-7-1 for reducing the initial speed of a material contacting a grinding disc is arranged on a blanking inner cylinder 1-7 of the vertical mill 1. The speed-reducing plate 1-7-1 is an arc-shaped fan ring, the outer ring of the speed-reducing plate is fixed on the blanking inner cylinder 1-7, the radial length from the inner ring to the outer ring of the speed-reducing plate is 0.3-0.6 times of the inner diameter of the blanking inner cylinder, and the included angle between the speed-reducing plate and the blanking inner cylinder in the vertical direction is 15-65 degrees. The phenomenon that the materials falling onto the grinding disc are easily thrown out due to high initial speed is avoided.
The size of the retarding plate ensures the throughput of materials, and the materials cannot be blocked due to large blocks; the setting of contained angle can protect the retarder, and the material can pile up on the board and form the dead material district when having the contained angle, can not lead to the fact wearing and tearing to the retarder.
As a further preferred embodiment, the retarding plates 1-7-1 are at least two stages, and the retarding plates at each stage are staggered along the axial direction. The speed of the material in the falling process is gradually reduced, the retention time of the material on the grinding disc is increased, and the circulating load is reduced.
The material falls onto the millstone through the blanking inner cylinder, and more than two stages of material retarding plates are added in the inner cylinder because the material conveying belt and the millstone have certain height; the materials impact the retarding plate in the falling process in the charging barrel, the speed of the materials is gradually reduced in the falling process under the action of the retarding plate, and the initial speed of the materials contacting the grinding disc is reduced finally; the grinding disc rotates at a constant speed, the initial speed of material particles is reduced, the retention time of the material on the grinding disc is prolonged, the grinding efficiency is improved, the amount of the material which directly enters a sorting system without being ground is reduced, and the circulating load is reduced.
When specifically implementing, the utility model discloses a developments selection powder machine 4 is last air-out, down dynamic selection powder machine of air-out form, and the selection powder machine adopts down the air-out form, realizes the mechanical promotion of material at utmost. Sorting the screened materials by a dynamic powder concentrator, and feeding qualified products into a cyclone cylinder from a discharge port; the semi-finished product particles enter a material return pipe of the dynamic powder concentrator by means of self gravity, and then enter the vertical mill for secondary grinding. Because the V-shaped selecting and connecting pipeline structure is not adopted, the height of the powder concentrator is reduced by 60 percent, and the height of a workshop is reduced by 60 percent.
In a preferred embodiment, the raw material external circulation final grinding system further comprises a dust collector 6, the gas outlet of the cyclone 5 is connected with the dust collector 6, in the embodiment, a bag dust collector is selected, and the gas from the cyclone passes through the bag dust collector, so that the dust content is further reduced.
As a further preferred embodiment, a clean gas discharge port of the dust collector 6 is connected with a fan 7, and the dynamic powder concentrator 4, the cyclone 5, the dust collector 6 and the fan 7 are sequentially connected to form a circulating system; the purified gas discharged from the dust collector is reused and conveyed into the dynamic powder concentrator to supply air to the dynamic powder concentrator, so that energy is saved.
The raw material external circulation final grinding system using the self-screening functional vertical mill is applied to cement grinding and food (coarse corn flour and wheat flour) processing.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.
Claims (10)
1. A raw material external circulation final grinding system using a self-screening vertical mill is characterized by comprising a vertical mill, a vibrating screen, a lifter, a dynamic powder concentrator and a cyclone cylinder; the vertical mill is connected with the vibrating screen to form a circulating system; the vertical mill, the vibrating screen, the hoister and the dynamic powder concentrator are sequentially connected to form a second circulating system; the vertical mill, the vibrating screen, the hoister, the dynamic powder concentrator and the cyclone are sequentially connected to form a raw material final grinding system;
the vertical mill is an external circulation vertical mill with a self-screening function, a screening device is arranged in the vertical mill, and the screening device is used for retaining the unground materials or large materials on a grinding disc for continuous grinding; the screening device is fixed on the material blocking ring of the vertical mill and/or above the wind ring, and the screening device is a screening grid plate.
2. The raw material external circulation final grinding system using the self-sieving function vertical mill as claimed in claim 1, wherein when the sieving grid plate is fixed on the material retaining ring, the aperture of the grid hole of the sieving grid plate is 60-90% of the maximum particle size of the newly-fed material, the area of the grid hole occupies 65-95% of the area of the sieving grid plate, and the ratio of the height of the sieving grid plate to the height of the material retaining ring is 0.6-1.2.
3. The external raw material circulation finish grinding system using the self-sieving vertical mill as claimed in claim 2, wherein the sieving grid plates are single-layered or multi-layered, and when multi-layered, one of the sieving grid plates is fixed on the baffle ring and is called as a fixed layer, and the other layers except the fixed layer are fixed on the fixed layer by binding the sieving grid plates of different layers with iron wires from the grid holes.
4. The raw material external circulation final grinding system using the self-sieving function vertical mill as claimed in claim 1, wherein when the sieving grid plate is fixed above the air ring, the sieving grid plate is arranged obliquely, the inclined angle of the sieving grid plate and the horizontal included angle of the vertical mill millstone are 15-65 degrees, and the aperture of the sieving grid plate is 30-80% of the maximum particle size of the newly-fed material.
5. The raw material external circulation final grinding system using the self-screening function vertical mill as claimed in claim 4, wherein the upper edge of the screening grid plate is closely attached to the inner side wall of the vertical mill shell, the screening grid plate is supported and fixed by a triangular bracket fixed on the vertical mill shell, and the lower edge of the screening grid plate extends to the outermost side of the material stopping ring in the circumferential direction.
6. The raw meal external circulation final grinding system using the self-screening function vertical mill according to any one of claims 1 to 5, wherein the body of the screening grid plate is composed of a single grid plate or a plurality of grid plates.
7. The raw material external circulation finish grinding system using the self-sieving function vertical mill as claimed in claim 1, wherein a retarding plate for reducing the initial speed of the material contacting the grinding disc is provided on the discharging inner cylinder of the vertical mill, the retarding plate is in a fan ring shape, the outer ring of the retarding plate is fixed on the discharging inner cylinder, the radial length from the inner ring to the outer ring of the retarding plate is 0.3-0.6 times of the inner diameter of the discharging inner cylinder, and the included angle between the retarding plate and the discharging inner cylinder in the vertical direction is 15-65 °.
8. The raw meal external circulation finish grinding system using the self-screening function vertical mill according to claim 7, wherein the retarding plates are at least two stages, and the retarding plates of each stage are staggered in the axial direction.
9. The raw meal external circulation final grinding system using the self-screening function vertical mill as claimed in claim 1, further comprising a dust collector, wherein the gas outlet of the cyclone is connected to the dust collector.
10. The external raw material circulation finish grinding system using the self-sieving vertical mill as claimed in claim 9, wherein the clean gas outlet of the dust collector is connected with a fan, and the dynamic powder concentrator, the cyclone, the dust collector and the fan are connected in sequence to form a circulation system.
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| CN201920768847.2U CN210304010U (en) | 2019-05-23 | 2019-05-23 | Raw material external circulation final grinding system using self-screening vertical mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999980A (en) * | 2019-05-23 | 2019-07-12 | 天津水泥工业设计研究院有限公司 | A kind of use is from the raw material outer circulation final grinding system of screening function Vertical Mill and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109999980A (en) * | 2019-05-23 | 2019-07-12 | 天津水泥工业设计研究院有限公司 | A kind of use is from the raw material outer circulation final grinding system of screening function Vertical Mill and application |
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