Control decisionmaking. 1. Introduction. Vertical roller mill (VRM) is a type of heavyduty and energyintensive grinding equipment for many industries, such as cement, steel and chemical industries. It is used to grind slag, nonmetallic ore and other block and granular raw materials into required powder materials.
A variable mass tuned particle absorber is designed for the nonlinear vertical vibration control of the corrugated rolling mill in the composite plate rolling process. Considering the nonlinear damping and nonlinear stiffness between the corrugated interface, a threedegreeoffreedom nonlinear vertical vibration mathematical model of corrugated rolling mill based on dynamic vibration absorber ...
Rolling mill vibration is a worldwide problem, although it has been found that the mill structure defects are the main cause of vibration, but the inhibition measures are difficult to implement. So we discussed the rolling force parameters influence on rolling mill vibration and suppression measures from rolling technology in this article. The results show that the rolling force is increased ...
Furthermore, the vibration suppression control algorithm of the mechanicalelectricalhydraulic vertical torsional coupling system is designed with the specific sequence backstepping method and dynamic surface control technique, which can resolve the problem of nesting in the controller design process.
Especially, the vertical vibration of rolls directly effects the exit thickness of strip. In order to restrain vertical vibration of rolls and improve stability of rolling process, the active control theory and technology has been used and to control the vertical vibration phenomenon. Zhang adopted the robust theory to control the strip tension ...
Firstly, based on the deterministic vertical vibration model of a fourroller cold rolling mill under harmonic excitation, a stochastic vertical vibration model of a fourroller cold rolling mill with random fluctuation as Gaussian white noise is introduced.
Vertical Roller Mills. Optimization of VRM Operation Do not believe screen values unless you have checked them Continuously change Process Parameters and document results to find Optimum Optimum is highest capacity at lowest power consumption Be sensitive to changes of feed material and adapt parameters Focus on Relevant Process Parameters only Optimize Control Loops
This article, based on the abrasion condition of the rollers on the working field, analyzes the movement characteristics of the material layer of the vertical roller mills from several aspects, such as the tangent speed difference between the roller and the grinding table, the "piles up" phenomenon as well as the flow forms of the material layer. Then we further studied the influence of the ...
As a result of the higher ∆Pmill, the mill vibration increases. (8 10mm/s), which results in a good opportunity to test the effect of the grinding aid. In contrast to tests with ball mills, the effect of grinding aids in a VRM is already visible and audible after 10 20min. Table 1: Data used to produce Figure 3.
The dried material unstable grinding bed causes vibration in VRM and can stop the mill. To avoid the situation water is directly sprayed into the bed via water ... Ning Yanyan, Zhu Guang, Yuan Mingzhe, Wang Zhuo, "Design of Intelligent control system for Vertical Roller Mill", The 2nd international conference on Intelligent control and ...
Air leakage of the system. Air leakage of the mill body is bound to cause small pressure difference, insufficient wind speed, making the powder cannot be taken away in time, affecting the output capacity of vertical roller mill. In addition, air leakage in other parts of the system will also reduce the wind speed, which will cause the ...
control system for Vertical Roller Mill", The 2nd international conference on Intelligent control and information processing. [5], Dr., P rem Kumar, Babu and ...
How do you reduce vertical roller mill vibration? gkmill News Adjustment of Grinding Pressure The central control operator should pay attention to the feedback value of the grinding pressure in time. When the grinding pressure is lower than the set pressure, it should be filled with nitrogen immediately to increase the grinding pressure.
In recent years vertical roller mill (VRM) has proved to be a popular choice for finished cement grinding due to low power consumption but it is also very sensitive to vibrations and can deteriorate productivity if process optimization is varied slightly.
The invention relates to a vertical roller mill hydraulic system, which comprises a plurality of grinding roll clamping hydraulic cylinders, a plurality of accumulator groups, a hydraulic station and connecting pipelines among the grinding roll clamping hydraulic cylinders, the accumulator groups and the hydraulic station, wherein the hydraulic station comprises an oil tank device, an oil pump ...
The model of parametrically excited nonlinear vertical vibration of roller system is established by considering the nonlinear damping and nonlinear stiffness within corrugated interface of corrugated rolling mill. ... Vertical Vibration Control of Cold Rolling Mill's Rolls Based on Timedelay Feedback Control Method MATEC Web of Conferences ...
A vertical roller mill having a function of suppressing selfexcited vibration is provided. The hydraulic circuit (20) connected to the hydraulic cylinder (13) that presses the crushing roller (4) on the crushing table (3) is connected to the pressure oil supply path (21) or the oil discharge path ( 29) At least one of the onoff valves (24, 30) is provided, a bypass passage (25, 32) for ...
1. Check that the tightness of all screws for the roller. jack (tensioning system) and drive units for the. motor and gearbox are as stated by the manufacturer; 2. Control the height of dam ring ...
The vertical vibration often occurs during the rolling production, which has an influence on the accuracy of rolling mill. In order to effectively suppress the vertical vibration of the rolling equipment, the rolling mill model with vibration absorber device was established. Based on the main resonance singularity of the rolling mill system, the best combination of opening parameters was obtained.
losses [1, 2]. In order to avoid the vibration of the rolling mill, a lot of research work has been carried out in recent years [37]. Based on the rolling force model of Sims, Wang and Yan established a dynamic vertical vibration model considering entrance thickness deviation [8]. Liu et al. [9] established a hysteresis nonlinear vertical vibra
Overview Products What we offer Customer stories Vertical roller mills offer supreme grinding with high energyefficiency Whether grinding raw coal, clinker, cement and/or slag, we have a VRM solution to suit your grinding needs.
1. Introduction. The vertical roller mill (VRM) is heavy mechanical equipment that used in the cement materials industry to process cement, slag, and coal cinder (Pani Mohanta, Citation 2015).The equipment always needs to work in the environment of heavy load, high temperature, high pressure, high corrosiveness, electromagnetic radiation interference, and multifield coupling, thus it is ...
This study establishes a verticalhorizontal coupling vibration model of hot rolling mill rolls under multipiecewise nonlinear constraints considering the piecewise nonlinear spring force and piecewise nonlinear friction force constraints of the hydraulic cylinder in the vertical direction of the rolls, the piecewise stiffness constraints in th...
The raw vertical roller mill has four rollers, 3000 KW main drive, m table diameter, m roller diameter with 330 t/h capacity (made by LOESCHE Company from Germany).
In this paper, taking a model of the vertical vibration of a fourroller cold rolling mill under harmonic excitation as a prototype class for a real system, the effects of random fluctuations on the system response are analyzed. ... Application of dynamic vibration absorber for vertical vibration control of corrugated rolling mill. 2023 ...
PROBLEM TO BE SOLVED: To provide a vertical roller mill enabling suppression of selfexcited : A vertical roller mill includes: a casing forming a classification chamber; a pulverization table housed below the casing and driven to rotate; a plurality of roller pressurization devices for pulverizing coal on the pulverization table by pressing pressure rollers against the ...
1. Introduction. The vertical vibration phenomenon associated with the cold rolling process has always attracted the attention of researchers at home and abroad, and it is also a major technical problem that plagues the production of iron and steel enterprises [1], [2], [3], [4].Fourroller cold rolling mills are widely used in aerospace [5], iron and steel metallurgy [6], and other industries ...
As shown in Figure 4, M 1, M 2, and M 3 are the equivalent mass of the upper part of mill stand, backup roll, and work roll. J 1 and J 2 are the rotational inertia of electrical machinery and upper rolls system of the rolling mill. K 1, K 2, K 3, and K 4 are the equivalent vertical stiffness. Based on Duffing theory, is the equivalent horizontal stiffness of backup roll.
Considering the two kinds of nonlinear constraints of rolling mill hydraulic cylinder, spring force and friction force, the vibration model of rolling mill system is established. The amplitude frequency response equations are obtained by using the average method. Comparing the time history curves of vertical vibration displacement of rolling mill system under the nonlinear spring force and ...
The vibration demolding of the crystallizer leads to slab thickness deviation in continuous casting processes. Therefore, in this paper, the dynamic model of the hot strip rolling mill vibration resulting from entry thickness deviation is proposed and its dynamic characteristics are studied. First, the dynamic model of vertical vibration in the hot strip rolling mill is established based on ...
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