CN115254373A - A scraper that is used for vertical roller to grind center feed - Google Patents
A scraper that is used for vertical roller to grind center feed Download PDFInfo
- Publication number
- CN115254373A CN115254373A CN202210729487.1A CN202210729487A CN115254373A CN 115254373 A CN115254373 A CN 115254373A CN 202210729487 A CN202210729487 A CN 202210729487A CN 115254373 A CN115254373 A CN 115254373A
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- scraping
- center
- angle
- central
- scraping plate
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- 238000007790 scraping Methods 0.000 claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 90
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 238000009825 accumulation Methods 0.000 abstract description 4
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 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
- 239000000843 powder Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
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
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- 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 central feeding, which comprises scraping units uniformly distributed around the center, wherein each scraping unit comprises a first central scraping plate and a second central scraping plate which are mutually connected, a certain included angle is formed between the first central scraping plate and the second central scraping plate, angle scraping plates distributed in a step shape are distributed on the first central scraping plate, and the second central scraping plate is connected with the inner wall of a machine body through a connecting piece. Through the formation of the center stockpile, the material on the grinding disc flows outwards and rolls with higher speed, so that the material is ground as soon as possible, the retention time of the material on the grinding disc is shortened, the continuous accumulation of the material is avoided, meanwhile, the flowing material can be accelerated to be taken away by hot air, the material is prevented from being accumulated at the center of the grinding disc due to humidity, the stability of a material bed is facilitated, excessive grinding is avoided, and the formation of the material bed and the stability of the operation of the grinding machine are promoted.
Description
Technical Field
The invention relates to the technical field of vertical roller mill feeding, in particular to a material scraping device for central feeding of a vertical roller mill.
Background
The central feeding position of the vertical roller mill is generally positioned at the center of a grinding disc or a position which is not far away from the center of a grinding roller, the material falling into the vertical roller mill is divided into dry material and wet material according to different moisture, the wet material has higher density, cohesiveness and friction coefficient relative to the dry material, under the action of the moisture, large and small particles and powdery material are mutually bonded and precipitated to form a continuously enlarged material block, because the centrifugal force of the material at the center of the grinding disc is smaller, the centrifugal force is smaller than the friction force, the material is increasingly piled up at the center, and after the mass of the central material pile is continuously enlarged, the material is more difficult to leave after being bonded on the grinding disc.
The material that falls into the outer layer of bold windrow can roll at the windrow skin, constantly continues to accelerate windrow formation, and too big windrow not only does not participate in grinding work, still occupies the mill space, and windrow piece not of uniform size can cause the grinding roller vibration when passing through the grinding roller, influences the stability of mill and the stability of bed.
Disclosure of Invention
The invention aims to provide a scraping device for center feeding of a vertical roller mill, which promotes material flow, realizes pushing of center blanking to the outer ring of a grinding disc, enables materials to participate in grinding of the materials as soon as possible, shortens retention time of the materials on the grinding disc, avoids continuous accumulation of the materials, improves drying efficiency of the materials, and ensures operation stability of a material bed and a grinding mill.
The invention is realized by the following technical scheme:
the utility model provides a scraping device for vertical roller mill center feed, includes around the scraping unit of central evenly distributed, each scrapes the flitch including interconnect's first center scrapes the flitch and the flitch is scraped at the second center, and first center is scraped the flitch and is scraped the flitch with second center and have certain contained angle between the flitch, and the flitch is scraped to the angle that is the echelonment and distributes on the flitch is scraped at first center, and the flitch is scraped through connecting piece and organism inner wall connection at the second center.
And the two adjacent angle scraping plates on the first central scraping plate are provided with overlapped scraping diameter areas.
The angle scraping plates are arranged downwards at a fixed interval, and the interval is larger than the height of the angle scraping plates.
And the included angle of the vertical plane of the second central scraping plate and the vertical plane of the grinding roller is between 20 and 50 degrees.
Compared with the prior art, the invention has the following beneficial effects:
the scraping device of the invention accelerates the outward flowing and rolling of the materials on the grinding disc by destroying the formation of the center stacking materials, so that the materials can participate in the grinding of the materials as soon as possible, the retention time of the materials on the grinding disc is shortened, the continuous stacking of the materials is avoided, meanwhile, the flowing materials can also accelerate the moisture removal by hot air, the materials are prevented from being stacked in the center of the grinding disc due to the humidity, the stability of a material bed is facilitated, the excessive grinding is avoided, the formation of the material bed is promoted, and the stability of the operation of the grinding machine is improved.
The invention has simple structure and good use effect, avoids the blockage of material accumulation and the formation of stacking blocks, promotes the formation of a material bed, improves the efficiency of grinding materials and the stability of the operation of the mill, and is worthy of wide popularization and use.
Drawings
FIG. 1 is a schematic structural view of a scraping device according to the present application;
FIG. 2 is a schematic structural diagram of the position of a scraping device in a vertical roller mill;
FIG. 3 is a schematic view of the scraping device in a scraping state;
FIG. 4 is a schematic view of a longitudinal distribution structure of the angle scraping plates;
FIG. 5 is a schematic view of a horizontal distribution structure of the angle scraping plates;
FIG. 6 is a schematic view of the structure of a double scraping unit;
fig. 7 is a schematic structural diagram of the device of three scraping units.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Examples
Referring to fig. 1-7, a scraping device for feeding in the center of a vertical roller mill comprises scraping units which are uniformly distributed around the center, round steel 6 is arranged at the center of the embodiment, the scraping units are uniformly distributed around the round steel 6 in the circumferential direction, the quantity of the scraping units is consistent according to the quantity of grinding rollers of the vertical roller mill, and a scraping unit is correspondingly arranged on the feeding side of each grinding roller.
Each material scraping unit comprises a first center material scraping plate 4 and a second center material scraping plate 3 which are connected with each other, the center material scraping plate is formed by the first center material scraping plate 4 and the second center material scraping plate 3, a certain included angle is formed between the first center material scraping plate 4 and the second center material scraping plate 3, rib plates 2 are arranged at included angles, angle material scraping plates 5 distributed in a step shape are distributed on the first center material scraping plate 4, each angle material scraping plate 5 comprises a connecting portion 51 fixedly connected with the side face of the first center material scraping plate 4 and an inclined plane portion 52 with a certain inclined included angle formed on the side face of the first center material scraping plate 4. The second center 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 of this application, the biggest distribution diameter of scraping flitch 4 and the second center and scraping flitch 3 combination leaves the certain distance in footpath and radially from the grinding roller grinding region, for outer mobile material reserves the motion space, makes and is pushed to the material linear velocity increase of scraping device excircle, and centrifugal force increases and outside continuation motion. The angle scraping plates 5 distributed in a ladder shape are distributed according to the repose angle of the material pile, the material is rolled outwards and downwards through the angle scraping plates 5 distributed in the ladder shape, the dynamic repose angle formed by the material pile is damaged, and the material is easier to move from inside to outside on the grinding disc.
Referring to fig. 3-5, the dynamic angle of repose θ ° of the material is found according to the humidity and the granularity of the material, 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 scraper 4 and the second center scraper 3 from the plane of the grinding disc, the distance of the blanking port from the top surface of the center scraper is H4, the height of the center scraper is H3, H2= H3+ H4, (see fig. 3).
Maximum distribution diameter of scraping plate R1= (H3 + H4) × cot theta + R2
According to one embodiment, a suitable material flow area L is selected depending on the size of the material particles. The material flow area on-line shows a material dynamic angle of repose tangent line from uniform blanking of the blanking pipe to blockage of the blanking pipe, and the blanking can be blocked without damaging the dynamic angle of repose of the material; the material can flow outwards under the action of the scraping device, and the material of the discharging pipe can be continuously supplemented, so that the discharging is smooth.
Flow area lower line radius R3= R1-L/(sin θ)
Given the radius R3 of the lower line of the flowing area and the distance H1 from the center scraping plate to the plane of the grinding disc, the height of the angle scraping plate 5 is D, the angle scraping plates 5 distributed in a gradient mode are arranged downwards according to a fixed interval, the interval is larger than the height D of the angle scraping plate, D is the numerical value of the overlapping area of the scraping areas of the adjacent angle scraping plates, the radius of each layer of angle scraping plate 5 relative to the center needs to be added with the numerical value D of the overlapping area, and the continuous downward pushing of the upper and lower scraping plates can be effectively guaranteed.
Preferably, therefore, the angle scrapers 5 are arranged downward at a fixed distance which is greater than the height of the angle scrapers 5. And a superposed material scraping diameter area is formed between two adjacent angle material scraping plates 5 on the first central material scraping plate 4, so that the materials are continuously rolled outwards and conveyed downwards.
H5 is therefore the height of the ideal pile tip above the central screed and can be calculated by trigonometric functions or measured from the figure.
The dynamic angle of repose which is determined by taking magnetite as a standard is 30-35 degrees, a larger angle of repose is 35 degrees, the diameter distribution diagram (shown in figure 4) of the angle center scraping plate 5 is drawn, and the maximum distribution diameters r1, r2 and r3 of 3 groups of angle scraping plates 5 are obtained. Then, as shown in fig. 5, the angle scraping plates 5 are arranged, and the angle scraping plates 5 distributed in a gradient manner are arranged at equal intervals according to the distance greater than the height D.
The first central scraping plate 3 and the second central scraping plate 4 are used as a main body of the scraping device, the angle alpha (figure 2) between the first central scraping plate 3 and the vertical plane of the grinding roller is relatively free, the angles between the first central scraping plate 4 and the second central scraping plate 3 are relatively free, the operation of other components such as a middle machine body observation door and the grinding roller is mainly prevented from being influenced by a connecting plate 1 welded on the second central scraping plate 4, under the condition that the rotation of the grinding roller is not influenced, the angle alpha is better in internal selection within a range of 20-50 degrees according to the particle size of materials, the thickness of a material bed and the like. The diameter of the outer circle formed by the connecting plate 1 is based on the diameter of the inner circle of the machine body capable of being welded, and the horizontal angle between the connecting plate and the plane of the grinding disc is freely set. For improving the wear resistance, the scraping device is characterized in that the first center scraping plate 4, the second center scraping plate 3 and the gradient distribution angle scraping plates 5 are made of wear-resistant plates or composite steel plates. The number of the scraping units is distributed according to the number of the grinding rollers of the vertical roller mill, the scraping units are used as single uniform distribution bodies, and the axial line of the central steel cylinder 6 is used as a rotation center for distribution. Because the grinding disc rotates clockwise, the three scraping units are distributed as close to the operation front of the grinding roller as possible (figure 2), so that materials can be supplied to a pre-powder area in front of the grinding roller uninterruptedly, and more fresh particle materials are guaranteed to participate in the grinding work under the grinding roller to form a stable grinding material bed.
Generally, the humidity and the granularity of the materials to be ground are required to be controlled, the humidity is required to be not more than 12%, the granularity is determined according to the grindability, the yield and the like of the materials, the scraping device breaks the formation of central stacking, the outward flowing and rolling of the materials on the grinding disc are accelerated, the moisture of the flowing materials is also accelerated to be taken away by hot air, and the materials with certain humidity are also beneficial to the stability of a material bed, so that excessive grinding is avoided; meanwhile, materials are ground as soon as possible, the retention time of the materials on the grinding disc is shortened, the outward movement and drying efficiency of the materials are accelerated, the continuous accumulation of the materials is avoided, and meanwhile, the formation of a material bed is promoted and the stability of the operation of the grinding mill is improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a scraper for vertical roller mill center feed which characterized in that: including around central evenly distributed's the unit of scraping, each scrape the material unit and all scrape the flitch with the second center including interconnect's first center and scrape the flitch, first center is scraped the flitch and is had certain contained angle with the second center and scrapes between the flitch, and the flitch is scraped to the angle that is the echelonment and distributes on the flitch is scraped at first center, and the flitch is scraped at the second center and is passed through connecting piece and organism inner wall connection.
2. The scraping device of claim 1, wherein: and the overlapped scraping diameter areas are arranged between the adjacent two angle scraping plates on the first central scraping plate.
3. The scraping device of claim 1, wherein: the angle scraping plates are arranged downwards at fixed equal intervals, and the intervals are larger than the heights of the angle scraping plates.
4. The scraping apparatus as claimed in claim 1, wherein: and the included angle of the vertical plane of the second central scraping plate and the vertical plane of the grinding roller is between 20 and 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 true CN115254373A (en) | 2022-11-01 |
| CN115254373B CN115254373B (en) | 2024-05-14 |
Family
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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 (12)
| 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 |
| US20020179751A1 (en) * | 2001-04-19 | 2002-12-05 | Kantonen Calvin Leslie | Method of recovery of precious metals & heavy minerals |
| 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 |
-
2022
- 2022-06-24 CN CN202210729487.1A patent/CN115254373B/en active Active
Patent Citations (12)
| 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 |
| US20020179751A1 (en) * | 2001-04-19 | 2002-12-05 | Kantonen Calvin Leslie | Method of recovery of precious metals & heavy minerals |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN115254373B (en) | 2024-05-14 |
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