CN115254373B - Scraping device for vertical roller mill center feeding - Google Patents
Scraping device for vertical roller mill center feeding Download PDFInfo
- Publication number
- CN115254373B CN115254373B CN202210729487.1A CN202210729487A CN115254373B CN 115254373 B CN115254373 B CN 115254373B CN 202210729487 A CN202210729487 A CN 202210729487A CN 115254373 B CN115254373 B CN 115254373B
- Authority
- CN
- China
- Prior art keywords
- scraping
- center
- scraping plate
- central
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007790 scraping Methods 0.000 title claims abstract description 125
- 239000000463 material Substances 0.000 claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 230000001133 acceleration Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2/00—Crushing or disintegrating by gyratory or cone crushers
- B02C2/10—Crushing or disintegrating by gyratory or cone crushers concentrically moved; Bell crushers
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to the technical field of vertical roller mill feeding, and discloses a scraping device for vertical roller mill center feeding, which comprises scraping units uniformly distributed around the center, wherein each scraping unit comprises a first center scraping plate and a second center scraping plate which are mutually connected, a certain included angle is formed between the first center scraping plate and the second center scraping plate, the first center scraping plate is provided with angle scraping plates distributed in a stepped manner, and the second center scraping plate is connected with the inner wall of a machine body through a connecting piece. Through destroying the formation of center windrow, the material outwards flows the roll on the acceleration mill, lets the material participate in the material grinding as early as possible, shortens the stay time of material on the mill, has avoided the material to pile up in succession, simultaneously, the material that flows also can be accelerated by hot-blast take away moisture, prevents that the material from pile up at the mill center because of humidity reason, is favorable to the stability of material bed, avoids excessive grinding, has also promoted the material bed and has formed and improved mill running stability.
Description
Technical Field
The invention relates to the technical field of vertical roller mill feeding, in particular to a scraping device for vertical roller mill center feeding.
Background
The vertical roller mill center feeding position is generally located at the center of the grinding disc or is not far away from the center of the grinding roller, materials falling into the vertical roller mill are divided into dry materials and wet materials according to different moisture, the wet materials have larger density, cohesiveness and friction coefficient relative to the dry materials, the materials falling into the grinding disc are mutually cohered and precipitated with powdery materials under the action of the moisture to form continuously enlarged material blocks, the centrifugal force of the materials at the center of the grinding disc is smaller, the materials are increasingly stacked at the center due to the fact that the centrifugal force is smaller than the friction force, and after the mass of a center material pile is continuously enlarged, the materials are adhered to the grinding disc and are more difficult to leave.
The material that falls on big lump material heap skin can roll at the heap skin, and the continuous acceleration windrow of continuously forms, and too big heap not only does not participate in grinding work, still occupies the mill space, and the heap piece of different sizes can cause the grinding roller vibration when the grinding roller, influences the stability of mill and the stability of material bed.
Disclosure of Invention
The invention aims to provide a scraping device for feeding a vertical roller mill center, which promotes material flow, realizes pushing a center blanking to an outer ring of a mill, ensures that the material participates in material grinding as soon as possible, shortens the retention time of the material on the mill, avoids continuous accumulation of the material, improves the material drying efficiency, and ensures the running stability of a material bed and a mill.
The invention is realized by the following technical scheme:
A scraping device for vertical roller mill center feed, including the scraping unit that surrounds central evenly distributed, center department sets up round steel, each scraping unit around round steel circumference evenly distributed, the quantity of scraping the material unit is unanimous with the grinding roller quantity of vertical roller mill, it is a scraping unit to lay to correspond at every grinding roller material side, each scraping unit all includes interconnect's first central scraping plate and second central scraping plate, there is certain contained angle first central scraping plate and second central scraping plate, the angle scraping plate that is the echelonment and distributes has been laid on the first central scraping plate, the second central scraping plate passes through the connecting piece and is connected with the organism inner wall, have the coincident scraping diameter region between two angles scraping plates on the first central scraping plate, the angle scraping plate is arranged downwards according to fixed interval, this interval is greater than the height of angle scraping plate, make the material outwards pile downwards through the angle scraping plate of echelonment and transport, destroy the dynamic angle that the material was formed.
The included angle between the second central scraping plate and the vertical plane of the grinding roller is 20-50 degrees.
Compared with the prior art, the invention has the following beneficial effects:
the scraping device disclosed by the invention accelerates the outward flowing rolling of the materials on the grinding disc by destroying the formation of the central stacking, so that the materials participate in the grinding of the materials as soon as possible, shortens the retention time of the materials on the grinding disc, avoids continuous accumulation of the materials, simultaneously, the flowing materials can accelerate the hot air to take away the moisture, prevents the materials from accumulating in the center of the grinding disc due to the humidity, is beneficial to the stability of a material bed, avoids excessive grinding, and also promotes the formation of the material bed and improves the running stability of the grinding machine.
The invention has simple structure and good use effect, avoids the material accumulation blocking and the formation of pile blocks, promotes the formation of a material bed, improves the grinding efficiency and the running stability of the grinding machine, and is worth widely popularizing and using.
Drawings
FIG. 1 is a schematic view of a scraping device according to the present application;
FIG. 2 is a schematic view of the position structure of the scraping device in the vertical roller mill;
FIG. 3 is a schematic view of a scraping state of the scraping device;
FIG. 4 is a schematic view of a longitudinal distribution structure of an angle scraper;
FIG. 5 is a schematic view of a horizontal distribution structure of an angle scraper;
FIG. 6 is a schematic view of a device structure of a double scraping unit;
Fig. 7 is a schematic view of the structure of the device of the three scraping units.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-7, a scraping device for feeding a vertical roller mill center comprises scraping units uniformly distributed around the center, round steel 6 is arranged at the center, the scraping units are uniformly distributed around the circumference of the round steel 6, the number of the scraping units is consistent according to the number of grinding rollers of the vertical roller mill, and one scraping unit is correspondingly arranged on the feeding side of each grinding roller.
Each scraping unit comprises a central scraping plate formed by a first central scraping plate 4 and a second central scraping plate 3 which are connected with each other, a certain included angle is formed between the first central scraping plate 4 and the second central scraping plate 3, rib plates 2 are arranged at the included angle, angle scraping plates 5 which are distributed in a stepped mode are distributed on the first central scraping plate 4, and each angle scraping plate 5 comprises a connecting portion 51 fixedly connected with the side face of the first central scraping plate 4 and an inclined face portion 52 which is provided with a certain inclined included angle with the face where the first central scraping plate 4 is located. The second central scraping plate 3 is connected with the inner wall of the machine body through a connecting piece 1, and the scraping device is fixed on the inner wall of the machine body in the vertical mill.
In the scraping device, the maximum distribution diameter of the combination of the first central scraping plate 4 and the second central scraping plate 3 is a certain distance away from the grinding area of the grinding roller in the radial direction, so that a movement space is reserved for outer-layer flowing materials, the linear speed of the materials pushed to the excircle of the scraping device is increased, and the centrifugal force is increased to move outwards continuously. The angle scraping plates 5 distributed in a stepped mode enable materials to roll and convey outwards and downwards according to the distribution of repose angles of the material piles, the dynamic repose angles formed by the material piles are damaged, and the materials are enabled to move inwards and outwards on the grinding disc more easily.
Referring to fig. 3-5, according to the humidity and granularity of the material, the dynamic repose angle θ° of the material is searched, the height of the blanking port from the center plane of the grinding disc is h1+h2, H1 is the distance between the first center scraping plate 4 and the second center scraping plate 3 and the plane of the grinding disc, the blanking port has a certain distance H4 from the top surface of the center scraping plate, and the height of the center scraping plate is h3, h2=h3+h4 (as shown in fig. 3).
Maximum distribution diameter r1= (h3+h4) ×cotθ+r2 of scraping plate
According to one embodiment, a suitable material flow area L is selected depending on the size of the particle size of the material. The upper line of the material flow area represents a material dynamic repose angle line from the blanking pipe to the blanking pipe which is blocked, at the moment, the dynamic repose angle of the material is not damaged, and the blanking pipe is blocked; the flowing area is in a line, materials can flow outwards under the action of the scraping device, and meanwhile, the materials of the discharging pipe can be continuously supplemented, so that the discharging is kept smooth.
Flow region radius R3 = R1-L/(sin theta)
The radius R3 of the flowing area, the distance H1 from the central scraping plate to the grinding disc plane are known, the height of the angle scraping plates 5 is D, the gradient distribution angle scraping plates 5 are downwards arranged at fixed intervals, the interval is larger than the height D of the angle scraping plates, D is the value of the overlapping area of the scraping areas of the adjacent angle scraping plates, the value D of the overlapping area is required to be added to the radius of each layer of angle scraping plates 5 relative to the center, and continuous outward and downward pushing of the upper scraping plates and the lower scraping plates can be effectively ensured.
Thus, the angle scrapers 5 are preferably arranged downwards at a fixed distance, which is greater than the height of the angle scrapers 5. The first central scraping plate 4 is provided with a coincident scraping diameter area between two adjacent scraping plates 5, so that materials are continuously rolled outwards and downwards for conveying.
H5 is the height of the ideal stockpile tip above the center screed and can be calculated by trigonometric functions or measured from the figure.
The dynamic repose angle based on magnetite is 30-35 degrees, the larger repose angle is selected to be 35 degrees, the diameter distribution diagram (shown in figure 4) of the angle center scraping plate 5 is drawn, and the distribution maximum diameters r1, r2 and r3 of the 3 groups of angle scraping plates 5 are obtained. The angular scrapers 5 are then arranged as in fig. 5, the angular scrapers 5 being arranged at equidistant intervals over their height D in a gradient distribution.
The second central scraping plate 3 and the first central scraping plate 4 are used as scraping device bodies, the vertical plane angle alpha (figure 2) between the second central scraping plate 3 and the grinding roller is relatively free, the angle between the first central scraping plate 4 and the second central scraping plate 3 is mainly used for avoiding that the connecting piece 1 welded on the second central scraping plate 3 does not influence the operation of other components such as a machine body observation door, the grinding roller and the like, and the angle alpha is better selected within a range of 20-50 degrees according to the size of material particles, the thickness of a material bed and the like under the condition that the rotation of the grinding roller is not influenced. The connecting piece 1 is formed to the diameter of the outer circle, and the diameter of the inner ring of the middle machine body can be welded, so that the horizontal angle with the plane of the grinding disc is freely set. The scraping device is characterized in that the abrasion resistance is improved, and the first central scraping plate 4, the second central scraping plate 3 and the gradient-distributed angle scraping plates 5 are all made of abrasion resistant plates or composite steel plates. The number of scraping units is distributed according to the number of grinding rolls of the vertical roller mill, the scraping units are used as single uniform distribution bodies, and the axis of the central steel cylinder 6 is used as a rotation center. Because the millstone rotates clockwise, the three scraping units are distributed as close to the running front of the millstone as possible (figure 2), and can continuously provide materials for a pre-powder area in front of the millstone, so that more fresh granular materials are ensured to participate in the grinding work under the millstone to form a stable grinding material bed.
The material entering the mill generally requires humidity and granularity to be controlled, the humidity is required to be not more than 12%, the granularity is determined according to grindability, yield and the like of the material, the scraping device damages the formation of a central stacking material, accelerates the material on the mill to flow outwards and roll, accelerates the flowing material to take away moisture by hot air, and the material with certain humidity is also beneficial to the stability of a material bed and avoids excessive grinding; meanwhile, the materials are enabled to participate in material grinding as soon as possible, the retention time of the materials on the grinding disc is shortened, the outward movement and the drying efficiency of the materials are quickened, the materials are prevented from being continuously piled up, meanwhile, the formation of a material bed is promoted, and the running stability of the grinding machine is improved.
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present invention can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (2)
1. A scrape material device that is used for vertical roller mill center feed, its characterized in that: the device comprises scraping units uniformly distributed around a center, round steel is arranged at the center, the scraping units are uniformly distributed around the circumference of the round steel, the number of the scraping units is consistent with that of grinding rolls of a vertical roller mill, one scraping unit is correspondingly arranged on the feeding side of each grinding roll, each scraping unit comprises a first central scraping plate and a second central scraping plate which are mutually connected, the inner end of each first central scraping plate is positioned at the center, the outer end of each first central scraping plate is connected with the corresponding second central scraping plate, a certain included angle is formed between each first central scraping plate and each second central scraping plate, the first central scraping plates are provided with angle scraping plates which are distributed in a stepped shape, and each angle scraping plate comprises a connecting part fixedly connected with the side face of each first central scraping plate and a bevel part with a certain inclined included angle with the plane where the corresponding first central scraping plate is positioned; the second center scraping plate is connected with the inner wall of the machine body through a connecting piece, a coincident scraping diameter area is arranged between two adjacent angle scraping plates on the first center scraping plate, the angle scraping plates are downwards arranged at fixed equal intervals, the interval is larger than the height of the angle scraping plates, the materials are outwards and downwards rolled and conveyed through the angle scraping plates distributed in a stepped mode, and the movable repose angle formed by a material pile is damaged.
2. The scraping apparatus as claimed in claim 1, wherein: the included angle between the second central scraping plate and the vertical plane of the grinding roller is 20-50 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210729487.1A CN115254373B (en) | 2022-06-24 | 2022-06-24 | Scraping device for vertical roller mill center feeding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210729487.1A CN115254373B (en) | 2022-06-24 | 2022-06-24 | Scraping device for vertical roller mill center feeding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115254373A CN115254373A (en) | 2022-11-01 |
| CN115254373B true CN115254373B (en) | 2024-05-14 |
Family
ID=83762174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210729487.1A Active CN115254373B (en) | 2022-06-24 | 2022-06-24 | Scraping device for vertical roller mill center feeding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115254373B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB202906A (en) * | 1922-12-28 | 1923-08-30 | Babcock & Wilcox Dampfkessel | Improvements in and relating to roller and ring mills for grinding and crushing coal and the like |
| EP0241930A2 (en) * | 1986-04-18 | 1987-10-21 | Hosokawa Micron Corporation | Particulate material treating apparatus |
| JP2001253410A (en) * | 2000-03-08 | 2001-09-18 | Sharp Corp | Crushed glass packaging device |
| CN102397806A (en) * | 2011-10-13 | 2012-04-04 | 郝志刚 | Material dispersing device for vertical grinder |
| CN106140398A (en) * | 2016-08-26 | 2016-11-23 | 江苏海建股份有限公司 | Novel automatic iron discharging formula grinding disc of vertical mill and row's difficult-to-grind materials method |
| CN106362833A (en) * | 2016-11-17 | 2017-02-01 | 河南黎明重工科技股份有限公司 | Rotary-ring mill |
| CN108067329A (en) * | 2017-12-14 | 2018-05-25 | 成都建筑材料工业设计研究院有限公司 | Mill material bed gathers materials cancellation element |
| CN209865943U (en) * | 2019-05-08 | 2019-12-31 | 陈镇强 | Food additive jar |
| CN211228295U (en) * | 2019-11-25 | 2020-08-11 | 任沛 | Building engineering residue processing apparatus |
| CN211385254U (en) * | 2019-10-15 | 2020-09-01 | 刘月平 | Multipurpose vertical mill |
| CN112547223A (en) * | 2020-11-09 | 2021-03-26 | 李景增 | Jam apparatus for producing for food processing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2344511A1 (en) * | 2001-04-19 | 2002-10-19 | First American Scientific Corp. | Method of recovery of precious metals and heavy minerals |
-
2022
- 2022-06-24 CN CN202210729487.1A patent/CN115254373B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB202906A (en) * | 1922-12-28 | 1923-08-30 | Babcock & Wilcox Dampfkessel | Improvements in and relating to roller and ring mills for grinding and crushing coal and the like |
| EP0241930A2 (en) * | 1986-04-18 | 1987-10-21 | Hosokawa Micron Corporation | Particulate material treating apparatus |
| JP2001253410A (en) * | 2000-03-08 | 2001-09-18 | Sharp Corp | Crushed glass packaging device |
| CN102397806A (en) * | 2011-10-13 | 2012-04-04 | 郝志刚 | Material dispersing device for vertical grinder |
| CN106140398A (en) * | 2016-08-26 | 2016-11-23 | 江苏海建股份有限公司 | Novel automatic iron discharging formula grinding disc of vertical mill and row's difficult-to-grind materials method |
| CN106362833A (en) * | 2016-11-17 | 2017-02-01 | 河南黎明重工科技股份有限公司 | Rotary-ring mill |
| CN108067329A (en) * | 2017-12-14 | 2018-05-25 | 成都建筑材料工业设计研究院有限公司 | Mill material bed gathers materials cancellation element |
| CN209865943U (en) * | 2019-05-08 | 2019-12-31 | 陈镇强 | Food additive jar |
| CN211385254U (en) * | 2019-10-15 | 2020-09-01 | 刘月平 | Multipurpose vertical mill |
| CN211228295U (en) * | 2019-11-25 | 2020-08-11 | 任沛 | Building engineering residue processing apparatus |
| CN112547223A (en) * | 2020-11-09 | 2021-03-26 | 李景增 | Jam apparatus for producing for food processing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115254373A (en) | 2022-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115254373B (en) | Scraping device for vertical roller mill center feeding | |
| CN112880373B (en) | Granulation drying treatment method for compound fertilizer preparation | |
| US4200242A (en) | Liner in grinding mill | |
| CN207478760U (en) | A kind of multilevel grinding system for producing micropowder | |
| US2984861A (en) | Balling drum | |
| US3140326A (en) | Agglomerating method and apparatus | |
| CN112050624A (en) | Continuous feeding and discharging sintering rotary furnace | |
| GB1440616A (en) | Method and apparatus for the treatment of particulate materials | |
| US3010145A (en) | Method and apparatus for producing ball-like nodules of fine-grained ores and minerals | |
| US3534891A (en) | Distributor for granular materials | |
| CN204892016U (en) | Energy -efficient continuous ball mill | |
| CN204768965U (en) | Grate discharge ball mill | |
| CN206082660U (en) | Stand and grind with stripe formula wearable grinder roll | |
| CN207777791U (en) | A kind of abrasion resistant polyurethane double layer innerliner pipeline | |
| CN207872298U (en) | A kind of Vertical Mill stablizes the device of the bed of material | |
| CN114471354B (en) | Circulating fluidization granulation and drying process and device | |
| US8556202B2 (en) | Roller grinding mill | |
| CN205731969U (en) | Screen tray and roller picker for roller picker | |
| CN205740767U (en) | The distribution device in the vertical limekiln of solid fuel | |
| CN215844053U (en) | Raw ball screening device and trolley | |
| CN105439699B (en) | Compound fertilizer anti-caking agent wrapping kiln | |
| CN114505013B (en) | Swinging type granulation machine for medicine production | |
| CN205907191U (en) | Air distribute device in vertical limekiln of solid fuel | |
| CN209480755U (en) | A kind of anti-isolation material delivery pipe of preventing unbalanced distribution of raw material | |
| CN214717159U (en) | Ball mill main shaft seal structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |