CN114602609A - Design method of striker plate for vertical grinding roller - Google Patents
Design method of striker plate for vertical grinding roller Download PDFInfo
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- CN114602609A CN114602609A CN202210350351.XA CN202210350351A CN114602609A CN 114602609 A CN114602609 A CN 114602609A CN 202210350351 A CN202210350351 A CN 202210350351A CN 114602609 A CN114602609 A CN 114602609A
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- grinding roller
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- material baffle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a design method of a material baffle plate for a vertical grinding rollertDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr(ii) a Secondly, determining a material baffle plate structure, wherein the material baffle plate is a V-shaped material baffle plate inclined towards the center direction of the grinding roller, a reflection plate is arranged on the side close to the grinding roller, and a interception plate is arranged on the other side; thirdly, calculating the structural parameters of the striker plate; fourthly, manufacturing the material baffle plate. Compared with the working condition without the material baffle plate, the material baffle plate manufactured is applied to the vertical grinding rollers, the quantity of materials which are not rolled of the bypass between the adjacent grinding rollers is reduced by 50% -60%, the effective material layer thickness and the grinding capacity are increased, the height of the material baffle ring is reduced, and the grinding efficiency is improved, so that important guarantee is provided. Compared with the traditional vertical roller milling technology, the height of the material baffle ring is reduced by 15-20%, the statistical average yield is increased by 10.8%, and the power consumption of the main machine is reduced by 13.7%.
Description
Technical Field
The invention belongs to the technical field of vertical roller grinding, and particularly relates to a design method of a material baffle plate for a vertical grinding roller.
Background
The vertical roller mill is called as a vertical mill for short, and the grinding principle is material layer grinding, namely, grinding of materials is realized by mutual extrusion between particles, and the controllability of the grinding process is good, and the grinding efficiency is high. The prior structural schematic diagram of the vertical roller mill unit is shown in figure 5.
The working principle of the existing structure is as follows: the new feed and the return material of the powder concentrator are fed into the middle of the millstone by the stock bin under the action of gravity, the millstone rotates to drive the material to rotate, the material moves from the middle of the millstone to the edge of the millstone under the action of centrifugal force, when the material moves to the lower part of the grinding roller, the grinding roller extrudes the material (material layer) under the combined action of force F and the material stop ring, the material is ground, the ground material crosses the material stop ring under the action of centrifugal force, leaves the millstone, falls into the air ring under the action of gravity, and is then upwards brought into the powder concentrator on the upper part of the mill by high-speed airflow in the air ring, qualified finished products are selected by the powder concentrator, unqualified large particles are mixed with the new feed through the stock bin and then are returned to the mill to be continuously ground until the ground into finished products with qualified particle size requirements.
The vertical roller mill integrates grinding, drying and powder selection, has compact structure, simple system, large drying capacity and strong adaptability to materials, is widely applied to grinding of various materials such as cement raw materials, clinker, industrial solid wastes, metallurgical slag and the like, but has the biggest common problem of poor controllability of a material layer compared with a roller press which is used for grinding the material layer, and the only means for controlling the material layer is the adjustment of the height of a material retaining ring of a grinding disc. The material blocking height is increased, the controllability of a material layer is improved, but the grinding efficiency is reduced; the material blocking height is reduced, the grinding efficiency is increased, but the material layer is thinned, the controllability is reduced, and the vibration of a grinder is increased; for equipment based on a material bed grinding principle, the controllability of a material bed directly influences the stability and the grinding efficiency of a grinding machine, so that the same materials are ground under common conditions, and the power consumption of a main machine of a vertical roller mill is about 0.5-1 kWh/t higher than that of a roller mill.
According to the analysis of the dynamic calculation result of the simulation of the discrete element of the material movement of the vertical roller grinding disc, the material on the grinding disc can be divided into A, B, C three areas: the material in the area A can completely enter the lower part of the grinding roller and can be rolled, the material in the area B is the material which is directly thrown out by the grinding disc through the gap between the two grinding rollers and is not rolled by the grinding roller (namely bypass material), and the material in the area C is the material rolled by the grinding roller. Because the areas A and B are materials which are not rolled by the grinding rollers, the area B is not theoretically needed from the viewpoint of improving the grinding efficiency and the stability of the mill, namely as long as the materials are not rolled, the materials are expected to completely enter the lower parts of the grinding rollers for rolling so as to generate more fine powder. Generally speaking, as the equipment specification is enlarged, the higher the system yield is, the lower the system power consumption is, but the vertical roller mill is developed from 50-60 t/h to 500-600 t/h in scale, and the main reason that the mill efficiency is not obviously improved is that the increase of the bypass amount of the B area causes the increase of the ineffective circulation amount in the mill, and the contribution of the enlargement of the mill to the mill efficiency is offset.
Because the materials in the C area are rolled by the grinding roller, a large amount of fine powder is mixed in the material layer, and the fine powder in the materials in the C area is theoretically required to be completely discharged from the aspect of improving the grinding efficiency of the material layer, but because the grinding disc stop ring exists, most of the fine powder mixed in the material layer below the height of the stop ring is remained at the bottom of the grinding area except for part of the fine powder discharged by the rotation and extrusion of the grinding roller, and the content of the fine powder with the particle size less than or equal to 80 mu m in the materials in the C area reaches 18-20% according to the statistical data of industrial production. A large amount of fine powder is remained at the bottom of the grinding disc to increase the fluidity of the material layer, so that the stability of the material layer is damaged, on one hand, the vibration of the grinding machine is caused, on the other hand, the grinding efficiency is reduced, the current of the grinding machine is reduced, the time of the grinding machine is reduced, the power consumption is increased, and meanwhile, the grain composition of a ground finished product is narrowed due to the increase of the internal circulation load of the grinding machine, and the quality and the performance of the finished product are influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a design method of a material baffle plate for a vertical grinding roller, which reduces the height of a material baffle ring, improves the grinding efficiency and improves the product quality.
The invention is realized in such a way, and the design method of the striker plate for the vertical grinding roller is characterized in that: firstly, according to the basic data and the grindability of materials when designing the mill, the model selection routine of the mill is adoptedDesign method for determining grinding disc diameter DtDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
Secondly, determining the structure of a material baffle plate, wherein the material baffle plate is a V-shaped material baffle plate inclined towards the center direction of the grinding roller, the side close to the grinding roller is a reflecting plate, and the other side is a interception plate;
thirdly, designing the structural parameters of the striker plate:
calculating the structural parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2：
Wherein L is1Length of interception segment of striker plate L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The radial positioning gap between the vertex (the connecting point of the interception section and the reflection section) of the striker plate and the inner side of the striker ring, d3The arc of the reflecting section is spaced from the positioning gap of the grinding roller, d4The front end of the reflection section is vertically positioned at a clearance H from the axis of the grinding roller1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The positioning height of the striker plate from the grinding disc lining plate;
α＝40±10°
β＝160±10°
d1＝20±10mm
d2＝20±10mm
d3＝0～10mm
d4＝(0.1～0.2)Dr1
h1＝(0.02～0.04)(Dr1+Dr2)
h2＝h1±10mm
H1＝200～350mm
R1＝0.5Dr1+d3
L1＝π(15～20)Dt/360
finally, manufacturing a striker plate, and obtaining a technological structure parameter H of the striker plate according to the third calculation1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; the hardness HRC of the wear-resistant layer is more than or equal to 50, and then the striker plate is welded according to the angle beta of the striker plate, and the wear-resistant surfaces are arranged on one side of the angle beta.
Compared with the working condition without the material baffle plate, the invention has the advantages and positive effects that the amount of the material which is not rolled and passes through the bypass between the adjacent grinding rollers is reduced by 50-60%, the effective material layer thickness and the grinding capacity are increased, and the invention provides important guarantee for reducing the height of the material baffle ring and improving the grinding efficiency. Under the same condition, compared with the traditional vertical roller milling technology, the height of the material blocking ring of the material blocking plate is reduced by 15-20%, the statistical average yield is increased by 10.8%, and the power consumption of the main machine is reduced by 13.7% in cooperation with the pressure adjustment of the grinding roller; in addition, the design method has the advantages of simplicity, reasonability and the like.
Drawings
FIG. 1 is a schematic structural view of a striker plate of the present invention;
FIG. 2 is a schematic view of the mounting structure of the present invention;
FIG. 3 is an expanded view from direction C to direction D of FIG. 2;
FIG. 4 is a schematic view of the striker plate mounting height;
fig. 5 is a schematic diagram of the structure of the conventional vertical roller mill unit.
In the figure, 1, grinding roller; 2. a striker plate; 2-1, a reflecting plate; 2-2, a interception plate; 3. a mill housing; 4. mounting a bracket; 5. a material blocking ring; 6. a liner plate; 7. a grinding disc.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, a design method of a striker plate for a vertical grinding roller includes determining a diameter D of a grinding disc according to basic data such as design time of a grinding machine, grindability of a material and the like and a conventional design method for model selection of the grinding machinetDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
Secondly, determining the structure of a material baffle plate, wherein the material baffle plate is a V-shaped material baffle plate 2 inclined towards the center direction of the grinding roller 1, the side close to the grinding roller is a reflecting plate 2-1, and the other side is a interception plate 2-2;
thirdly, designing the structural parameters of the striker plate:
calculating the structural parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2：
Wherein L is1Length of interception segment of striker plate L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The radial positioning gap between the vertex (the connecting point of the interception section and the reflection section) of the striker plate and the inner side of the striker ring, d3The arc of the reflecting section is spaced from the positioning gap of the grinding roller, d4The front end of the reflection section is vertically positioned at a clearance H from the axis of the grinding roller1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The distance between the material baffle and the millstone lining plate is the positioning height.
α＝40±10°
β＝160±10°
d1＝20±10mm
d2＝20±10mm
d3＝0～10mm
d4＝(0.1～0.2)Dr1
h1＝(0.02～0.04)(Dr1+Dr2)
h2＝h1±10mm
H1＝200～350mm
R1＝0.5Dr1+d3
L1＝π(15～20)Dt/360
Finally, manufacturing a striker plate, and obtaining a technological structure parameter H of the striker plate according to the third calculation1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; the hardness HRC of the wear-resistant layer is more than or equal to 50, then the striker plate is welded according to the angle beta of the striker plate, and the wear-resistant surfaces are all arranged on one side of the angle beta.
In practical use, the mounting bracket 4 is fixedly mounted on the mill shell 3, and the structural form of the mounting bracket is designed according to practical requirements and is not limited to be fixed or adjustable.
The manufactured material baffle plate scheme is mainly used for solving the problem that the material extruded by the grinding roller in front of the grinding roller is not rolled, the structure of the material baffle plate is a V-shaped folded plate as a whole, the front part and the rear part of the material baffle plate are divided into two sections, namely a reflecting plate at the side close to the grinding roller and a blocking plate at the side far away from the grinding roller; the reflecting plate is a blocking section and mainly has the main functions of reversely pushing the materials extruded by the grinding roller to the lower part of the grinding roller by utilizing the momentum reflection principle for grinding, so that the thickness of the blanking layer is increased under the same condition, the stability of the grinding machine is improved, more fine powder is generated after grinding under the condition of ensuring the pressure of the grinding roller, and the improvement of the grinding machine time is facilitated; the intercepting plate section has the main functions of intercepting part of the material in the area B without being directly bypassed through grinding by the grinding roller, conveying the material to the back intercepting section under the action of rotation of the grinding disc, and reversely pushing the material back by the back intercepting section reflecting plate to enter the lower part of the grinding roller for grinding, so that the material layer thickness and the fine powder amount are further increased, and the grinding time of a grinder is increased.
The material motion control realization process is as follows: the material drops to the mill from central unloading pipe under the action of gravity, and rotate together with the mill, receive centrifugal force and blanking impact dispersion from the mill center to the motion of mill edge, the part material (about 30%) that is higher than the striker ring directly moves to the mill below and rolls, another part material (about 40%) that is higher than the striker ring moves to the striker plate end, move to the mill roller below along the striker plate, and force to send to the mill roller main aspects grinding area and grind by striker plate front end V type reverse folded plate, compare the operating mode that does not have the striker plate, the material volume that is not rolled of bypass reduces 50% -60% between the adjacent mill roller, increase effective material thickness and grinding ability, for reducing the striker ring height, improve grinding efficiency and provide important guarantee.
In the traditional vertical roller mill without the striker plate process, the thickness of a material layer is mainly realized by the height of the striker ring, so that the increase of the striker height is a common practice of the operation of the vertical roller mill in order to improve the stability of the mill when the stand of the mill is used. However, as mentioned above, increasing the height of the material blocking ring can limit the discharge of fine powder at the bottom of the grinding disc, destroy the stability of the material layer and reduce the grinding efficiency. Under the same condition, the material baffle can effectively improve the thickness of a material layer, so that the height of the material baffle ring is reduced, the stable operation of the mill under the low height of the material baffle ring is ensured, fine powder at the bottom of the mill can more easily leave the mill, the content of the fine powder of the mill is reduced, the stability of the material layer is improved, the grinding efficiency is improved, and the power consumption of grinding is reduced when the mill is used. According to the statistical data of the industrial test of the raw mill of TRM38.4 of Tianjin institute, under the same condition, the height of the material baffle ring of the material baffle plate is reduced by 15-20%, the statistical average yield is increased by 10.8%, and the power consumption of the main machine is reduced by 13.7%. The industrial test data are shown in table 1.
TABLE 1 TRM38.4 raw meal mill striker plate millstone material motion control scheme industrial test data
According to the industrial test statistical data in table 1, under the same condition, compared with the traditional vertical roller milling technology without the material baffle plate, the material baffle plate can reduce the height of the material baffle ring by 26.6%, the statistical average output is increased by 10.8%, the power consumption of a host is reduced by 13.7%, and the technical effects that the material motion control of the back grinding disc is implemented by the material baffle plate in the aspects of improving the stability of the grinding mill and improving the grinding efficiency are proved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The design method of the striker plate for the vertical grinding roller is characterized in that: firstly, determining the diameter D of a grinding disc according to basic data such as design time of a grinding machine, grindability of materials and the like and a conventional design method for model selection of the grinding machinetDiameter D of big end of grinding rollerr1Diameter D of small end of grinding rollerr2Width B of grinding rollerr；
Secondly, confirm the structure of striker plate: the material baffle is a V-shaped material baffle inclined towards the center direction of the grinding roller, a reflection plate is arranged on the side close to the grinding roller, and a interception plate is arranged on the other side;
thirdly, designing the structural parameters of the striker plate:
calculating the structural parameter L of the striker plate1、L2、d1、d2、d3、d4、H1、R1、α、β、h1、h2: wherein L is1Length of interception segment of striker plate L2Length of reflecting section of striker plate, d1The radial positioning gap between the tail end of the intercepting section and the inner side of the material retaining ring, d2The radial positioning gap between the vertex of the striker plate (the connecting point of the interception section and the reflection section) and the inner side of the striker ring, d3The arc of the reflecting section is spaced from the positioning gap of the grinding roller, d4The front end of the reflection section is vertically positioned at a clearance H from the axis of the grinding roller1Height of striker plate, R1The curvature radius of an arc line of the reflection section, the included angle between the alpha striker plate and the axis of the grinding roller, the included angle between the beta reflection section and the interception section, and h1Height of the dam ring h2The positioning height of the striker plate from the grinding disc lining plate;
α＝40±10°
β＝160±10°
d1＝20±10mm
d2＝20±10mm
d3＝0～10mm
d4＝(0.1～0.2)Dr1
h1＝(0.02～0.04)(Dr1+Dr2)
h2＝h1±10mm
H1＝200～350mm
R1＝0.5Dr1+d3
L1＝π(15～20)Dt/360
finally, manufacturing the striker plate, and obtaining the technological structure parameter H of the striker plate according to the calculation of the step three1、R1、L1、L2Blanking, wherein the thickness of the base plate of the material baffle plate is 12 or 10 or 8 or 6mm, and the thickness of the corresponding wear-resistant layer is 12 or 10 or 8 or 6 mm; the hardness HRC of the wear-resistant layer is more than or equal to 50, then the striker plate is welded according to the striker plate angle beta, and the wear-resistant surfaces are arranged on one side of the beta angle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116371541A (en) * | 2023-04-11 | 2023-07-04 | 安徽恒光智能装备有限公司 | Novel grinding roller grinding disc lining plate structure for vertical mill |
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