scholarly journals Use of automated electric drives for limiting dynamic loads in shaft lines of roll mill stands

2019 ◽  
Vol 2019 (17) ◽  
pp. 3578-3581 ◽  
Author(s):  
Andrey A. Radionov ◽  
Vadim R. Gasiyarov ◽  
Alexander S. Karandaev ◽  
Vadim R. Khramshin
Keyword(s):  
Dynamic Loads ◽  
Electric Drives ◽  
Roll Mill

scholarly journals Computer model of electric drive of 1L100K conveying unit

2019 ◽  
Vol 134 ◽  
pp. 01012
Author(s):  
Denis Zolkin ◽  
Vadim Petrov
Keyword(s):  
Control System ◽  
Electric Drive ◽  
Ring System ◽  
Vibration Damping ◽  
Electromechanical System ◽  
Dynamic Loads ◽  
Belt Conveyor ◽  
Electric Drives ◽  
Belt Conveyors ◽  
Elastic Elements

The paper deals with the problems of vibration damping and limiting dynamic loads in the electromechanical system of a belt conveyor by means of an adjustable electric drive. A conveying unit is represented as a three-mass ring system, which corresponds to a conveying unit with cinematically closed tape. The development of the structure of the control system for electric drives of belt conveyors with limited dynamic loads in elastic elements will reduce the dynamic loads on the belt and therefore the wear of the belts. Conditions of damping of oscillations in electromechanical system of belt conveyors are defined.

scholarly journals Dynamic Torque Limitation Principle in the Main Line of a Mill Stand: Explanation and Rationale for Use

Machines ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 76 ◽  
Author(s):  
V.R. Gasiyarov ◽  
V.R. Khramshin ◽  
S.S. Voronin ◽  
T.A. Lisovskaya ◽  
O.A. Gasiyarova
Keyword(s):  
Research Team ◽  
Elastic Collision ◽  
Dynamic Loads ◽  
Load Torque ◽  
Electric Drives ◽  
Drive Control ◽  
Negative Acceleration ◽  
Before And After ◽  
Mill Stand ◽  
Case Basis

This paper substantiates why it is necessary to limit the dynamic loads in stand shafts when closing angular gaps. The paper is a feasibility study of a concept developed specifically to limit each of the factors that affect amplitude of the dynamic torque; limitations applied are determined on a case-by-case basis. The research team studied the components of elastic torque in a dual-mass electromechanical system of Mill 5000 caused by vibrations arising from the elasticity of transmission as well as from the vibrations caused by elastic collision itself. It is shown that the lowest possible pre-acceleration is necessary for decreasing the dynamic coefficient at a near-nominal load torque. A principle of limiting dynamic loads when closing an angular gap is proposed, which implies collecting tachograms of an electric drive subjected to positive or negative acceleration before and after the fed metal is captured. The research team has developed drive control principles to implement this approach. The recommendation is to upgrade the electric drives of the reversing stand in Mill 5000.

scholarly journals Сhoosing the Belt Conveyor Start Mode

2019 ◽  
pp. 54-59
Author(s):  
Vladimir P. Metelkov ◽  
Yakov L. Liberman
Keyword(s):  
Asynchronous Motor ◽  
Conveyor Belt ◽  
Tension Control ◽  
Dynamic Loads ◽  
Electric Drives ◽  
Start Up ◽  
High Tension ◽  
Control Devices ◽  
The Cost ◽  
The Magnetic Field

The paper is concerned with the problems associated with starting a long conveyor driven by an induction motor. We consider the dynamic loads in the conveyor belt during start-up, which cause slippage of the conveyor belt on the traction drum leading to its premature deterioration. The relevance of the topic is associated with the high cost of the conveyor belt reaching 60% of the cost of the entire conveyor and more. The aim of the work is to ascertain the possibilities of reducing the wear of the conveyor belt, for example, through the use of the possibilities provided by the system of the electric drive. The possibility of reducing the probability of the conveyor belt slippage by increasing the initial belt tension is noted. However, constant high tension also accelerates belt deterioration. To solve this problem, the use of automatic tension control devices is proposed, as well as the reduction of dynamic loads in the belt by using soft starters based on a thyristor voltage converter, which regulates the amplitude of voltage on the motor stator. The features of an asynchronous motor heating when starting with a constant speed of rotation of the magnetic field are discussed. The interrelation between the start-up duration and the motor stator winding heating with the dynamic loads occurring in the conveyor belt in start-up modes is considered. Modeling results obtained using the Simulink package are presented. Since long start-up modes of asynchronous electric drives based on thyristor voltage converters can lead to motor overheating, especially when the conveyor is restarted under full load and in hot climates, it is advisable to use automatic conveyor belt tension control devices during start-up modes thereby reducing premature belt deterioration together with a decrease in the conveyor motor heating.

Study of the dynamics of ТПА 350 automatic mill working stand elements

2020 ◽  
Vol 76 (8) ◽  
pp. 830-840
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotnii
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Maximum Amplitude ◽  
Calculation Scheme ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Mass Model ◽  
Automatic Mill ◽  
Hollow Billet ◽  
Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

μ- SYNTHESIS OF ROBUST SPEED CONTROLLER OF SYNCHRONOUS ELECTRIC DRIVES

2015 ◽  
Vol 20 (96) ◽  
pp. 42-50
Author(s):  
Dmitrij I. Morozov ◽  
◽  
Evgenij S. Rudnev ◽  
Keyword(s):  
Electric Drives ◽  
Speed Controller

OPTIMIZATION OF REGULATORS OF FREQUENCY CONTROLLED INDUCTION ELECTRIC DRIVES UNDER THE STOCHASTIC LOADINGS

2016 ◽  
Vol 2016 (4) ◽  
pp. 53-55 ◽  
Author(s):  
Yu.V. Shurub ◽  
◽  
A.O. Dudnyk ◽  
D.S. Lavinskiy ◽  
◽  
...  
Keyword(s):  
Electric Drives

ELECTRIC DRIVE, ITS CONDITION AND PROSPECTS

2020 ◽  
Author(s):  
N.D. Kobzeva ◽  
◽  
R.S. Durov ◽  
E.V. Varnakova ◽  
K.O. Kobzev ◽  
...  
Keyword(s):  
Electric Drive ◽  
The State ◽  
Electric Drives

The known definitions for the concept of "electric drive"are given. The analysis of the state of electric drives in Russia is made. The requirements imposed on them are stated. The main criteria for improvement and development are formulated.

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