![[PDF] Vertical Vibration Control of Cold Rolling Mill's Rolls Based on ...](/gf78xuj/418.jpg)
In this paper, a two degree of freedom nonlinear vertical vibration equation of the cold rolling mill with the dynamic rolling force was established, then the delay feedback control method was introduced into the equation to controlled the vertical vibration of the system.
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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.
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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 ...
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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 ...
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VRM construction, its process and parameters which affects the performance and productivity of vertical roller mill are discussed. Also the consequences of variations in parameter explained.
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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
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A vibration monitoring method of strip rolling mill based on the digital twin model was proposed which could effectively reduce the structure complexity and test cost of the traditional monitoring system. Firstly, the coupling vibration mechanism model of the dynamic characteristics of roll system and bearings of fourhigh mill was established. Secondly, the digital twin model of strip rolling ...
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Vertical vibration model in unsteady lubrication process. In this study, a 1420 mm UCM mill, which was the 4th stand of a tandem cold rolling process, was used as a model, as depicted in Fig. 6(a). ... Nonlinear vertical vibration control of corrugated rolling mill based on particle damping absorber. 2023, Kang T'ieh/Iron and Steel.
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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 ...
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Provided is a vertical roller mill equipped with a function for inhibiting selfexcited vibration. A hydraulic circuit (20) connected to a hydraulic cylinder (13) for pushing a milling roller (4) on a milling table (3) is equipped with: open/close valves (24, 30) on a pressurized oil supply path (21) and/or a discharge oil path (29) of the hydraulic circuit (20); a bypass path (25, 32) for ...
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Abstract. 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 ...
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The control of vertical vibration of rolling mill is mainly divided into two categories according to whether energy is needed: active control and passive control. Wang and Frayman [19] applied fuzzy neural network to the torsional vibration control of rolling mill. By comparing with the traditional algorithm, the control accuracy and system
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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.
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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 ...
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Vertical roller mill (VRM) is a largescale grinding equipment, which is used to grind raw materials from block/granule into powder. Due to harsh production environment and inconsistent raw material quality, VRM requires timely regulation.
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In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using physical parameters of an operating VRM. The mathematical model is derived and simulated for a set of working parameters. Mechanical properties of the grinding material and the physical properties of the mechanical construction are used in the vibration model in order to obtain more realistic results ...
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The vertical roller mill has high energy efficiency and the installation space is smaller compared with tube mills. These days, the vertical roller mills have been widely adopted. A）Structure (1) The rollers are hydraulically pressed against a disc table and the feed is ground between the rollers and the disc table.
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Request PDF | Vibration Analysis of a Vertical Roller Mill: Modeling and Validation | In this paper, vibration characteristics of a Vertical Roller Mill (VRM) are studied by using...
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The vibration of the vertical system of a cold rolling mill is a major concern for factory production. In factory production, it is found that the thickness control system with dynamic stiffness compensation of the rolling mill has a significant impact on the rolling mill vibration. In this work, a mechanical hydraulic coupling vibration model of a cold rolling mill with a thickness control ...
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This work concentrates on the energy consumption and grinding energy efficiency of a laboratory vertical roller mill (VRM) under various operating parameters. For design of experiments (DOE), the response surface method (RSM) was employed with the VRM experiments to systematically investigate the influence of operating parameters on the energy consumption and grinding energy efficiency.
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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 ...
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When the material layer is too thin, the feeding amount should be increased to increase the equipment pressure difference, stabilize the material layer, and reduce equipment vibration. If the material layer is too thick, you should immediately reduce the amount of feed and increase the amount of ventilation to ensure a smooth discharge system.
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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 ...
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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.
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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.
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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.
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Comparison of Figures indicates that the two ranges of, namely, N < < > 5 N, can cause severe vibration of rolling mill rolls in the vertical and horizontal directions. In this study, a coupled vibration model of hot rolling mill rolls under the effect of multiple nonlinear forces was established.
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Roller mill tests can help determine the right roll speed ratio for your material. Roll gap. Controlling the roll gap (Figure 3) is critical to achieving your required final particle size. This control has two components: the roll gap size and roll alignment. The roller mill operator can control the particle size by widening or narrowing the ...
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Vertical roller mill is suitable for the largescale processing of nonmetallic mineral powders below 1250 mesh. Its largescale and energysaving effects are significant. ... causing vibration. ... The control of moisture content of raw material is very important for the stable operation of vertical roller mill. If the moisture content of the ...
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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 ...
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Abstract. The purpose of this study is to reveal the mechanism of unstable vibration occurring in the grinding operation of roller mills and to show the design guidelines for reducing the vibration. To study the basic cause of the unstable vibration, we first investigated the dynamic characteristics of the mill vibration in its stable state and ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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