This article establishes a mechanical-electrical-hydraulic vertical torsional coupling vibration mathematical model, and investigates its vibration suppression control strategy with time varying full state constraints for the rolling mill vertical torsional coupling vibration system.
In the working process of vertical roller mill, it will have vibration, but these vibrations are belonging to the small scale vibration. When the vertical roller mill machine has problems, it will have serious vibration.
The vertical roller mill (VRM) is a kind of large equipment that widely used in cement materials industry. Since it always needs to work in the environment of heavy load, high temperature, high pressure and electromagnetic radiation interference, it …
In the process of strip rolling, mill vibration induces vertical and horizontal displacements in the rolls and rolled parts, affecting the accuracy of the rolling analysis model. Constant changes occurred in the rolling zone between the upper and lower working rolls due to mill vibration, resulting in slight vertical and horizontal displacements of the …
A disadvantage of vertical roller mills is the vibration of the rolls, Fujita and Saito [3] determined that the mill vibration is caused by the frictional characteristics.
Based on the lubrication principle of rolling process and the mechanical vibration theory, a vertical vibration model of single-stand aluminum cold rolling mills was established with the consideration of dynamic friction state in roll gap to study vertical vibration phenomena in high speed rolling of thin strips. This model includes the geometric model of roll gap, …
Keywords: vertical roller mill, modeling, simulation, cement grinding, residence time distribution 1. Introduction Grinding operation is one of the important parts of the cement production processes.
A compact coal mill solution for grinding virtually any type of raw coal. Our ATOX® Coal Mill is a compact vertical roller mill that can grind almost any type of raw coal. The coal mill utilises compression and shear force generated between the large rollers and the rotating table to crush and grind raw coal, removing the need for a separate ...
It ultimately combines the mill vertical system structure model, and vertical vibration model of single-stand cold rolling mill is established with coupling those models above. It contributes to the theoretical basis for the study on vibration mechanism analysis and control strategy in the high-speed rolling process.
In this study, pilot scale tests were performed with a mobile vertical-roller-mill grinding plant to investigate the relationships between operational parameters. The identification and quantification of the grinding parameter relationships was carried out to implement these relationships into a computational vertical-roller-mill performance model.
Download Citation | On Jun 1, 2023, Xiaofei Chen and others published Dynamical responses for a vertical vibration model of a four-roller cold rolling mill under combined stochastic and harmonic ...
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 …
Considering the dynamic influence of the roll vibration on the lubricant film thickness in the rolling deformation area, nonlinear dynamic rolling forces related to film thickness in the vertical and horizontal directions were obtained based on the Karman's balance theory. Based on these dynamic rolling forces and the mechanical vibration of …
The Vertical Roller Mill (VRM) reduces the power consumption for cement grinding approximately 30-40% associated with other grinding mills. The process variables in cement grinding process using VRM are strongly nonlinear and having large time delay characteristics also dynamics changes within 2-4 minutes.
This study provides a theoretical basis for restraining the vibration of hot rolling mill rolls and optimizing the process parameters.
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. The amplitude-frequency equations of primary resonance of system was carried out by …
A vibration of of the vertical roller mill data set in 60 minutes (um) and Day-Month-Year-Time (a.m.) where data is collected.
Abstract and Figures. There are few studies concerning the process simulation of vertical roller mills (VRMs). In this research work, the application of population balance model for simulation of ...
Vertical roller mill has proved to be a popular choice for finished cement grinding over all other machineries due to advantages like low power consumption, higher capacity, process simplifications and compactness but it is also very sensitive to vibrations and can deteriorate productivity if process.
A vertical roller mill, also known as a vertical grinding mill or vertical mill, is a comprehensive grinding equipment integrating crushing, drying, grinding, grading, and conveying. Vertical grinding mills can be widely …
Based on these dynamic rolling forces and the mechanical vibration of the rolling mill, a vertical–horizontal coupling nonlinear vibration dynamic model was established. The amplitude–frequency equation of the main resonance was …
The rolling mill vibration not only seriously causes the strip thickness heterogeneity, but also damages the rolling mill equipment and its electrical components. Existing vibration suppression methods are passive and mainly tune mechanical, hydraulic, electrical and rolling process parameters. A new active vibration suppression method …
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The OK vertical roller mill is a compact and energy-efficient mill for grinding cement, slag, and blended cements. It uses 30-50% less energy than ball mill systems and allows for a more simplified plant layout. The OK mill combines drying, grinding, and separation into a single unit. It provides reliable operation with low noise and vibration.
The working principle and structure of low-vibration vertical roller mills and forces of key component were analyzed intelligently and based on the intelligent numeral calculations, the maximum stresses of three key components were much lower than the yield strength of materials and the rocker arm-roller system of the proposed low …
The results reveal the impact of system parameters upon the vertical nonlinear vibration of the cold rolling mill, which can serve as an academic reference for reducing the vibration and enhancing the stabilization of the cold rolling system.
Considering the nonlinear stiffness constraint action from the hydraulic cylinder in the four-high rolling mill process, the vertical vibration dynamic model with two degrees of freedom is established. The nonlinear vertical vibration equation of roll system contained the nonlinear stiffness of the hydraulic cylinder is established on the basis of …
Gearbox replacement on a vertical roller mill by Cementos La Cruz Azul*) selves as well as on the ancillary equipment, such as the lubrication unit. As a result, the installation of a MAAG lubrication system is advantageous due to its higher level of operational reliability and lower maintenance requirements. Fig. 2 shows a schematic ...
This paper studies the twist vibration of the branch closed system in the main transmission system of the vertical rolling mill, by means of the method of the theory and measurement, reason of negative moment of two roller in rolling steel is found. The research result shows that the theoretical calculation is consistent with the spot …
Through MATLAB simulation, the vertical vibration characteris- tics of the strip mill work roll are compared and analyzed under the condition that the outer raceway failure of the roller bearing remains unchanged, the inner raceway failure changes and the inner and outer raceway failures change simultaneously.
UBE Vertical Mill. As for limestone, cement, metals, chemicals, biomass, ceramics, and fiber materials, various fields needs pulverization technology for reducing these materials into fine particles. UBE Vertical mill will meet these needs. UBE Vertical Mill Video.
Semantic Scholar extracted view of "Dynamical responses for a vertical vibration model of a four-roller cold rolling mill under combined stochastic and harmonic excitations" by Xiaofei Chen et al.
The Kurimoto VX Mill is designed to feed material to the center of a table, where the material horizontally rolls and moves in the peripheral direction of the table with centrifugal force. The material is ground between the table and three rollers installed along the top face on the concave section in the table and conveyed further in the peripheral direction. …
Abstract. Vertical roller mill (VRM) is a large-scale grinding equipment, which is used to grind raw materials from block/granule into powder. Due to harsh production environment and inconsistent ...
The working principle and structure of low-vibration vertical roller mills and forces of key component were analyzed intelligently and based on the intelligent numeral calculations, the maximum stresses of three key components were much lower than the yield strength of materials and the rocker arm-roller system of the proposed low …
