Vertical roller grinding method for grinding dry powdery material
阅读说明：本技术 用于研磨干粉状物料的立式辊磨粉磨方法 (Vertical roller grinding method for grinding dry powdery material ) 是由 刘迪 聂文海 李亮 赵剑波 竹永奎 于 2019-11-14 设计创作，主要内容包括：本发明涉及一种用于研磨干粉状物料的立式辊磨粉磨方法,首先,通过磨辊自重,使磨辊自动下落,调整机械限位位置,使之碰触下摇臂；再通过调整机械限位位置,同时调节液压系统对磨辊施加一定的辊压,使磨辊和磨盘的衬板之间的间隙保持恒定；在磨机运行期间,干粉状物料在离心力的作用下,通过磨辊与磨盘衬板之间的间隙,在恒辊缝的工况条件下得到挤压、破碎和研磨。本发明的粉磨方法区别于传统立式辊磨粉磨方式,不需要对磨机进行较大幅度的改进,节约成本,同时克服了干粉状物料形成料层薄、不实,且极易破坏的缺点,能够使物料在恒定的辊缝中破碎和研磨,减少磨机振动,提高磨机稳定性和研磨效率。(The invention relates to a vertical roller grinding method for grinding dry powdery materials, which comprises the following steps of firstly, enabling a grinding roller to automatically fall down through the self weight of the grinding roller, and adjusting the mechanical limit position to enable the grinding roller to touch a lower rocker arm; then, the mechanical limit position is adjusted, and a hydraulic system is adjusted to apply a certain rolling pressure on the grinding roller, so that the gap between the grinding roller and the lining plate of the grinding disc is kept constant; during the operation of the mill, the dry powdery material is extruded, crushed and ground under the action of centrifugal force through the gap between the grinding roller and the grinding disc lining plate under the working condition of constant roll gap. The grinding method is different from the traditional vertical roller grinding mode, does not need to greatly improve the grinding machine, saves the cost, overcomes the defects of thin and non-solid material layer formed by dry powdery materials and easy damage, can crush and grind the materials in a constant roller gap, reduces the vibration of the grinding machine, and improves the stability and the grinding efficiency of the grinding machine.)
1. A vertical roller grinding method for grinding dry powdery materials is provided, wherein the vertical roller comprises a grinding roller, a grinding disc, an upper rocker arm, a lower rocker arm and a hydraulic system; the method is characterized in that:
the vertical roller mill is provided with a mechanical limit which can enable a constant gap to be reserved between the grinding roller and a lining plate of the grinding disc when the mill runs, and the mechanical limit props against the lower rocker arm when the mill runs;
firstly, the grinding roller automatically falls down through the self weight of the grinding roller, and the mechanical limit position is adjusted to touch the lower rocker arm; then, the mechanical limit position is adjusted, and a hydraulic system is adjusted to apply a certain rolling pressure on the grinding roller, so that the gap between the grinding roller and the lining plate of the grinding disc is kept constant; during the operation of the mill, the dry powdery material is extruded, crushed and ground under the action of centrifugal force through the gap between the grinding roller and the grinding disc lining plate under the working condition of constant roll gap.
2. The vertical roller mill grinding method for grinding a dry powdery material according to claim 1, characterized in that: the lining plate of the grinding disc is bowl-shaped and forms a certain included angle with the horizontal position.
3. The vertical roller mill grinding method for grinding a dry powdery material according to claim 1, characterized in that: the clearance between the grinding roller and the lining plate of the grinding disc is 5-80 mm.
4. The vertical roller mill grinding method for grinding a dry powdery material according to claim 1, characterized in that: the mechanical limit is composed of a screw rod and a fixed seat, the screw rod and the fixed seat are connected in a thread fit mode, and the adjustment of the mechanical limit position is achieved by adjusting the screw rod in threaded connection with the fixed seat.
5. The vertical roller mill grinding method for grinding a dry powdery material according to claim 1, characterized in that: the mechanical limit is arranged on a frame of the vertical roller mill.
Technical Field
The invention belongs to the technical field of vertical roller mill, and particularly relates to a vertical roller mill grinding method for grinding dry powdery materials.
Background
The vertical roller mill is a material bed grinding device widely used at present, integrates crushing, drying, grinding and grading conveying, and has the main advantages of high grinding efficiency and low production energy consumption.
The shape of the grinding roller, the inclination angle of the grinding disc and the height of the material blocking ring are the key points influencing the formation of a stable material layer and the grinding efficiency of the vertical roller mill. Because the friction coefficient between dry powder materials is small, the flowability is good, so that a stable material layer can be formed, aiming at the vertical roller mill of the materials, the grinding disc lining plate needs to be inclined at a certain angle and is in a bowl-shaped structure at the design position of the vertical roller mill, so that the flowing time of the materials from the feeding center to the edge of the grinding disc is reduced, and the grinding efficiency is improved.
The material falls on the mill through feeding device, is centrifugal motion under the mill drive, and in the motion process from the feed center to mill edge, mill and welt are spread gradually to the material to form the bed of material of certain thickness, and the grinding roller passes through hydraulic system, and the slow material of roll-in on the welt because material particle size is different, contains a quantitative gas between the material particle simultaneously, leads to the grinding roller can fluctuate from top to bottom at the roll-in-process, forms a quantitative impact, is exactly the mill vibration of custom name. The energy accumulator is arranged on the general vertical roller mill, so that the impact fluctuation in the operation of the mill can be relieved, the overload pressure is absorbed, and the stable operation of the mill is ensured.
For the powder materials ground by the vertical roller mill, particularly the dry powder materials with extremely low moisture content, the materials fall on the grinding disc through the feeding device and do centrifugal operation along with the rotation of the grinding disc, and the material layer formed is thin and loose in the process of moving from the feeding center to the edge of the grinding disc, so that the materials are easily blown away and damaged by the airflow in the mill. When the grinding roller is pressed on the material through the hydraulic system, the grinding roller is difficult to compact the material layer, and the material layer can be damaged quickly even if the grinding roller is pressed on a relatively thin material layer; meanwhile, a new material layer is continuously established and repeated, so that the fluctuation frequency of the grinding roller is high, high-frequency vibration is formed, the grinding efficiency of the grinding machine is reduced, the capability of the grinding machine is influenced, and the energy accumulator device cannot be relieved even if the energy accumulator device is added.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the vertical roller grinding method for grinding the dry powdery material, the vertical roller grinding method is adopted to improve the grinding efficiency, reduce the vibration and noise of the grinding machine and stabilize the material layer, and the vertical roller grinding method is simple and convenient to install and use.
The invention is realized in this way, a vertical roller mill grinding method for grinding dry powdery materials, the vertical roller mill comprises a grinding roller, a grinding disc, an upper rocker arm, a lower rocker arm, a hydraulic system and the like;
the vertical roller mill is provided with a mechanical limit which can enable a constant gap to be reserved between the grinding roller and a lining plate of the grinding disc when the mill runs, and the mechanical limit props against the lower rocker arm when the mill runs;
firstly, the grinding roller automatically falls down through the self weight of the grinding roller, and the mechanical limit position is adjusted to touch the lower rocker arm; then, the mechanical limit position is adjusted, and a hydraulic system is adjusted to apply a certain rolling pressure on the grinding roller, so that the gap between the grinding roller and the lining plate of the grinding disc is kept constant; during the operation of the mill, the dry powdery material is extruded, crushed and ground under the action of centrifugal force through the gap between the grinding roller and the grinding disc lining plate under the working condition of constant roll gap.
In the above technical solution, preferably, the lining plate of the grinding disc is bowl-shaped and forms a certain included angle with the horizontal position.
In the technical scheme, preferably, the gap between the grinding roller and the lining plate of the grinding disc is 5-80 mm.
In the above technical scheme, preferably, the mechanical limit is composed of a screw rod and a fixed seat, the screw rod and the fixed seat are connected in a threaded fit manner, and the adjustment of the mechanical limit position is realized by adjusting the screw rod in threaded connection with the fixed seat.
In the above technical solution, preferably, the mechanical limit is mounted on a frame of the vertical roller mill.
The invention has the advantages and positive effects that:
1. the invention is specially used for grinding dry powdery materials, and the mechanical limit is arranged, and the clearance between the grinding roller and the lining plate is kept constant during the operation of the grinding machine through the self weight and the rolling of the grinding roller, so that the dry powdery materials are extruded, crushed and ground under the operation working condition of constant roll gap.
2. The invention overcomes the defects that the material layer formed by the dry powdery material is thin and not solid and is easy to damage, can crush and grind the material in a constant roll gap, reduces the vibration of the mill, and improves the operation stability and the grinding efficiency of the mill.
Drawings
FIG. 1 is a schematic structural view of a vertical roller mill for grinding dry powdered materials provided by an embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure: 1. grinding the roller; 2. a grinding disc; 3. a liner plate; 4. an upper rocker arm; 5. a lower rocker arm; 6. a frame; 7. a bearing seat; 8. mechanical limiting; 8-1, screw; 8-2, fixing seats; 9. a hydraulic cylinder; m, the distance between the grinding roller and the lining plate.
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 below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, the specific structure of the vertical roller mill of the invention is briefly explained, please refer to fig. 1 and 2, the vertical roller mill comprises a grinding roller 1, a grinding disc 2, an upper rocker arm 4, a
The embodiment provides a vertical roller grinding method for grinding dry powdery materials, which comprises the following steps that firstly, a grinding roller 1 automatically falls down through the self weight of the grinding roller 1, and a screw 8-1 of a
Specifically, the millstone lining plate 3 is bowl-shaped and forms a certain included angle with the horizontal position.
Specifically, the gap between the grinding roller 1 and the lining plate 3 of the grinding disc is 5-80 mm.
Specifically, the
The working principle of the invention patent is as follows:
aiming at the vertical roller mill for grinding dry powder materials, in order to overcome the defects that a material layer formed by the mill is thin, not solid and extremely easy to damage, the vertical roller mill needs to be different from the traditional grinding mode when grinding the materials.
Utilize the grinding roller dead weight, let the grinding roller fall the roller automatically, make the spacing front end of machinery touch down the rocking arm simultaneously, adjust the clearance between grinding roller and the welt through the screw rod distance in the adjustment machinery is spacing, make it keep in reasonable within range, and through hydraulic system, exert certain roll-in to the grinding roller, guarantee simultaneously that the clearance between grinding roller and the mill welt is invariable. Under the driving action of the motor, the material falling to the center of the grinding disc rotates along with the grinding disc to move centrifugally and is pushed to the edge from the center of the grinding disc, and the gap between the grinding roller and the lining plate is constant and has a certain rolling effect, so that the material is extruded through the gap between the grinding roller and the lining plate under the action of the centrifugal force to form a constant material layer and be crushed and ground simultaneously.
In conclusion, the vertical roller mill for grinding dry powdery materials can form a stable material layer on the lining plate, and meanwhile, the effective rolling of the grinding roller is obtained, so that the grinding efficiency is improved, the grinding times are reduced, the stability and the grinding efficiency of a material bed are improved, and the service life of a wear-resistant part is prolonged.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
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