European Type Jaw Crusher

European Type Jaw Crusher is a new crushing machine, the jaw crusher manufacturer, after the release of traditional jaw crusher. This jaw crusher is a perfect combination of modern science and technology and the production practice, which can better satisfy the automatic production demands of vast customers.

Input Size: 0-930mm
Capacity: 12-650TPH

Materials:
Granite, marble, basalt, limestone, quartz, pebble, copper ore, iron ore.

VSI6X Series Vertical Crusher

Due to the increasing market demand for the scale, intensification, energy conservation, environment protection and high-quality machine-made sand, a Chinese professional sand maker manufacturer, further optimizes the structure and function of traditional vertical-shaft impact crushers and launches a new generation of sand-making and reshaping machine with high efficiency and low costs --- VSI6X Series Vertical Crusher.

Input Size: 0-50mm
Capacity: 100-583TPH

Materials:
Granite, quartz, basalt, pebble, limestone, dolomite, etc.

LM Vertical Mill

High drying efficiency, Low running cost, Good environmental effect

LM Vertical Mill integrates crushing, drying, grinding, classifying and conveying together, and it is specialized in processing non-metallic minerals, pulverized coal and slag. Its coverage area is reduced by 50% compared with ball mill, and the energy consumption is saved by 30%-40% similarly.

Applications: Cement, coal, power plant desulfurization, metallurgy, chemical industry, non-metallic mineral, construction material, ceramics.

MTW Trapezium Mill

Large capacity, Low consumption, Environmental friendly

MTW European Trapezium Mill has a large market share in the grinding industry. Whether bevel gear overall drive, inner automatic thin-oil lubricating system or arc air channel, these proprietary technologies makes machine advanced, humanized and green.

Applications: Cement, coal , power plant desulfurization, metallurgy, chemical industry, non-metallic mineral, construction material, ceramics.

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Little abrasion wear, Long service life

Based on 30 years of development experience of grinding equipment, LM Heavy Industry produced LUM Series Superfine Vertical Roller Grinding Mill to make ultra-fine powder. The grinding roller doesn't contact with millstone usually, which makes abrasion little and service life longer.

Applications: Superfine dry powder of none-metal ores such as calcite, marble, limestone, coarse whiting, talc, barite and dolomite and so on.

how to control eccentricity problem in hot rolling mill

Roll Eccentricity Control for Strip Rolling Mills

1987-7-1  SIMULATION RESULTS In eccentricity control, the following practical considerations apply to production rolling mills and thus should be cons idered in the des ign of relevant simulation studies: • the incoming feed can introduce periodic disturbances in the form of hot rolled thickness disturbances or uncoiler induced tension fluctuations, • apparently small levels of hysteresis can produce significant thickness errors, • eccentricity effects may be different from one side of a mill

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Roll Eccentricity Control for Strip Rolling Mills

Friction induced hysteresis is shown to be a major cause of poor performance whose impact can be minimised by the appropriate location of load cells and the correct control design strategy. Advantages arising from the design are suitability for hot and cold 4-high rolling mills, with or without pulse generators on the undriven backup rolls, and modest computational requirements.

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Unwind/rewind eccentricity control for rolling mills

A method of controlling a rolling mill receiving material to be rolled from an unwind coil of the material, which coil includes means for driving the same in a manner that maintains the material between the mill and coil in tension, the unwind coil producing a cyclic disturbance in said tension, the method comprising.

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Strip Thickness Control of Cold Rolling Mill with Roll

2013-11-12  where M is mill modulus The BISRA relationship is used to develop a thickness feedback signal for closed-loop control. To control the output thickness, the motion of hydraulic cylinder con-trolling the roll gap position is such that produces the desired output thickness. Roll eccentricities are caused by axial deviations between the roll barrel and the roll necks due to irregularities in the mill rolls and/or roll bearings. These irregularities cause cyclic deviations in the strip thickness at the output of a mill

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hot rolling mill roll eccentricity in haiti

2021-5-23  PDF Hot rolling mill hydraulic gap control HGC. The mill stretch compensation and other disturbances during the rolling process are compensated and a rolling speed dependent adaptive PI controller is developed to accomplish fine thickness control. Active compensation of roll eccentricity in rolling

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Table 1 from Strip Thickness Control of Cold Rolling

Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network. In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used.

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A SURVEY OF THE LOOPER-TENSION CONTROL

2011-7-20  and mass flow in hot rolling mills can be satisfied by proper control of the strip tension and looper angle. Figure 1 shows the tension and looper control in a typical finishing mill. Traditionally, looper angle control has been per-formed by changing the rotating speed of a main motor but there has been no tension feedback

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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness

2015-11-4  accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Figure 1.

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Advanced Process and Quality Control in Hot Rolling Mills

2007-11-2  The hot testing system consists of a water-cooled testing head, testing electronics and various software tools that together form a comprehensive, fully automated system. It can be fully integrated in the mill control network. 4.1 Water-Cooled Test Head The sensor is a robust, water-cooled test head through which the hot material passes

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A BASIC UNDERSTANDING OF THE MECHANICS OF

2003-10-15  Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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Unwind/rewind eccentricity control for rolling mills

Rolling mill eccentricity compensation using measurement of sheet tension: 1987-04-14: Stewart et al. 72/8: 4648257: Rolling mill eccentricity compensation using actual measurement of exit sheet thickness: 1987-03-10: Oliver et al. 72/8: 4545228: Roll eccentricity control system for a rolling apparatus: 1985-10-08: Yamaguti et al. 72/8: 4531392

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CiteSeerX — ROLL ECCENTRICITY CONTROL WITH

CiteSeerX Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers need not replace their

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A SURVEY OF THE LOOPER-TENSION CONTROL

2011-7-20  and mass flow in hot rolling mills can be satisfied by proper control of the strip tension and looper angle. Figure 1 shows the tension and looper control in a typical finishing mill. Traditionally, looper angle control has been per-formed by changing the rotating speed of a main motor but there has been no tension feedback

get price

Hot Rolling Mill Hydraulic Gap Control (HGC) thickness

2015-11-4  accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Figure 1.

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Online Eccentricity Monitoring Weihong Guo of Seamless

2019-9-10  Online Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot

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ANALYSIS OF CAMBER FORMATION, SUPPRESSION AND

2020-7-22  CONTROL IN HOT ROLLING OF WEDGE-SHAPED SLABS BY stresses for highly asymmetric rolling scenarios for a single mill stand coupled with heavy sideguides and edgers. The developed enhanced models will also lead to an improvement in problem for many years, cf. e.g. [5–8], and most of such studies are based on qualitative

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Improvement of Accuracy for Gauge and Elongation

2012-9-14  above control systems, a desired elongation is realized by control-ling the rolling force of the mill by a hydraulic screw-down control system. 2.3 AEC for skin pass mill of continuous processing line 2.3.1 Conventional AEC methods and their problems In most cases, an in-line skin pass mill

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A BASIC UNDERSTANDING OF THE MECHANICS OF

2003-10-15  Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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The Hot Rolling Process California Steel

The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

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Rolling Technology and Theory for the Last 100 Years:

At the time when the past basic research and development flowered, development of many new type rolling mills with the crown-shape control function were reported. 72,73,74,75,76,77,78) A pair cross rolling mill with a big effect of profile control for hot rolling mills was put to practical use, 79) which became a standard rolling mill for the

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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness

2015-11-4  accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Figure 1.

get price

Roll eccentricity compensation based on anti-aliasing

Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis

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ANALYSIS OF CAMBER FORMATION, SUPPRESSION AND

2020-7-22  CONTROL IN HOT ROLLING OF WEDGE-SHAPED SLABS BY stresses for highly asymmetric rolling scenarios for a single mill stand coupled with heavy sideguides and edgers. The developed enhanced models will also lead to an improvement in problem for many years, cf. e.g. [5–8], and most of such studies are based on qualitative

get price

Improvement of Accuracy for Gauge and Elongation

2012-9-14  above control systems, a desired elongation is realized by control-ling the rolling force of the mill by a hydraulic screw-down control system. 2.3 AEC for skin pass mill of continuous processing line 2.3.1 Conventional AEC methods and their problems In most cases, an in-line skin pass mill

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Rolling Mill Tutorial Control System Design

2001-2-26  Rolling Mill Tutorial. Before continuing, make sure you have read Chapter 5. System Description. Another control problem (besides the continuous caster) arising in the steel industry is the control of the exit steel thickness in a rolling mill. The diagram below shows the layout of a rolling mill

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Dynamics and Variance Control of Hot Mill Loopers

Key words: Loopers, Covariance control, Variance control, Hot strip mill, Hot rolling 1 Introduction A flnishing mill produces thin sheet from hot steel bars by successively reduc-ing the gauge using 5 to 7 sets of rolls, each called a mill stand. The flnishing mill is part of a hot strip mill, of which a typical layout is given in Figure 1.

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A BASIC UNDERSTANDING OF THE MECHANICS OF

2003-10-15  Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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Temperature control in hot strip mill General Electric

These strategies are well known and are described, for example, in "Automatic Shape Control-- Hoogoven's 88--In. Hot Strip Mill" by F. Hollander and A. G. Reinen, Iron and Steel Engineer, April, 1976. Strip flatness control will be improved where the rolling force at each stand is maintained more nearly constant throughout the strip length.

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The Hot Rolling Process California Steel

The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

get price

Improving the Prediction of the Roll Separating Force in a

2017-7-5  rolling mill products have led to great efforts to improve the control and automation systems of the rolling process [1-3]. Hot steel rolling is one of the most important steel manufacturing processes. Hot rolling is the first metal shaping process after the slab has been cast, in

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