RU37954U1 - AUTOMATIC CONTROL DEVICE FOR PULSE-CORRECT DEVICE OF CONTINUOUS PREPARING MACHINE - Google Patents

Description

AUTOMATIC CONTROL DEVICE

POWER-DRIVING ELECTRIC DRIVE

CONTINUOUS CASTING MACHINES

The utility model relates to ferrous metallurgy, and more specifically to continuous casting machines with multi-roller pull-level device and can be used to create automatic control systems for the process of continuous casting of steel billets.

A device for controlling the electric drive of the rollers of a pulling device (utility model certificate No. 15676, class B 22 D 11/16, 2000) is known, comprising a load control system for each individual electric drive motor, consisting of a computing unit and torque controllers, with a functional output each moment regulator is connected to the first output of the system for regulating the electric motors of rotation of the pulling rollers, its functional output is connected to another output of the corresponding power resistor, and The increasing input of each moment controller is connected to the corresponding output of the computing unit. Moreover, all electric drive motors are connected to the same voltage source.

The disadvantages of the device are: firstly, the fact that when you change the value of the moment on one of the engines as a result of the redistribution of the total current, the moment is redistributed between all other motors, while it is difficult to achieve the required distribution of moments between the engines, and secondly, the range of regulation of the magnitude moments

engines is small enough, while the difference between the moment values in different sections of the pull-level device is large, which does not allow to fully achieve the required distribution of pulling forces between the engines, leading to significant longitudinal forces, and, consequently, to the formation of cracks in bullion.

B22D 11/16

:, ..

The closest analogue is a device for automatic control of the electric zone of the secondary cooling zone of the continuous casting machine In 22 D 11/16, 2000), consisting of current sensors of the engines of the pulling rollers, which make it possible to measure the total current on the radial, 1-curvilinear, horizontal until the liquid phase closes and horizontal after the liquid phase closes the sections whose outputs are connected to the computing unit, and regulators of radial, curvilinear, horizontal engines before closing the liquid phase and horizontal after closing the liquid phase sections whose inputs are connected to the outputs of the computing unit.

The disadvantage of this device is that it does not allow you to control the distribution and magnitudes of the moments on individual engines of the curved section, as a result of which it is impossible to reduce the likelihood of cracking during bending.

The technical result of the proposed device is that due to the creation of backwater in a curved section of the secondary cooling zone, the likelihood of cracking is reduced, resulting in an increase in the quality of the ingot.

The technical result is achieved due to the fact that the automatic drive control device for the pull-straight device of the continuous casting machine with multi-roll draw control device and pull roller rotation motors contains current sensors of the pull roller engines located on the radial, curvilinear, horizontal until the liquid phase closes and horizontal after closing the liquid phase in sections and having the ability to measure the total currents in these sections, the inputs of which are connected with a computing unit, engine control systems configured to control radial, curvilinear, horizontal until the liquid phase closes and horizontal after closing the liquid phase sections, the inputs of which are connected to the computing unit, each of the curvilinear section motors is additionally equipped with a current sensor, a back pressure regulator , the gauge of a size of a backwater and

the adder, and the adder inputs are connected to the outputs of the computing unit and the outputs of the pressure sensors, the inputs of the sub-controller are connected to the outputs of the total current sensors of the curvilinear section motors, the inputs of the current sensor of each motor are soy; cenens with the outputs of the pressure control, and the sensor outputs the current of each motor is connected to the inputs of the respective motors of rotation of the pulling rollers, the inputs of the sensor of the magnitude of the backwater are connected to the outputs of the computing unit and the outputs current sensors of the corresponding motor. In FIG. 1 is a structural diagram of a device for automatically controlling an electric drive of a pull-and-proper device for a continuous casting machine. The automatic control device for the electric drive of the pulling device of the continuous casting machine, consists of motors 1 of the rotation of the pulling rollers radial 2, curved 3, horizontal until the liquid phase 4 closes and horizontal after the liquid phase 5 closes, stretching continuous billet 6, inside which there is a solidified liquid phase 7, contains sensors for the total current of the radial 8, curvilinear 9 engines, horizontal until the liquid phase 10 closes, and horizontally after the closure of the liquid phase of 11 sections and the control system of the radial 12, curved 13 engines, horizontal until the closure of the liquid phase 14 and horizontal after the closure of the liquid phase 15, as well as regulators of the back pressure 17, current sensors of individual motors of the curved section 18, back pressure sensors 19 and adders 20. The outputs of the current sensors 8, 9, 10, 11 are connected to the inputs of the computing unit 16, through them information is received on the current value of the total currents of the motors of the respective sections, it also the information about the task for the drawing speed of the ingot Uac is dull. The outputs of the control systems 12,13,14,15 are connected to the inputs of the corresponding sensors of the total currents 8, 9,10,11. The inputs of the regulators of the amount of backwater of the curved section 17 are connected to the outputs of the sensors of the total current of the curved section 9, through which voltage is supplied to it, and the outputs of the corresponding adder 20, through which the control signal Uyj. The inputs of the current sensors of the respective motors of the curved section 18 are connected to the outputs of the regulators of the backwater value 17, the outputs of which are in turn connected to the electric motors of the curved section and the sensors of the back pressure 19. From the current sensors of the motors of the curved section 18, a signal about the value of the rotating engine torque mdv1. Also, the outputs of the computing unit 16 are connected to the sensors of the backwater 19, through which the MOJ information about the moment component of the electric motor, which determines the pulling force of the ingot at the contact with the roller, is received. The signal about the magnitude of the backwater force Uni comes from the output of the gauge of the backwater size 19 to the adder 20, in which it is combined with the task of the backwater Usni coming from the output of the computing unit 16. The device operates as follows. Based on the information from the sensors of the total current 8, 9, 10, 11, the computing unit 16 provides the driving signals to the inputs of the control systems 12, 13, 14, 15 of the respective sections, which supply the required voltage to the motors of the pulling rollers 1, and the rollers of the sections 2, 3 , 4, 5 of the pull-correct device inform the ingot 6 of the necessary force. In the curved section, the voltage from the control system 13 is supplied to the pressure controllers 17. The information about the torque of the engine Мдв1 from the current sensors of the engines 18 is fed to the pressure sensor 19. The pressure sensor in the pressure sensor 19 determines the pressure in this inter-roller space using the following formula :

o2w / c 4s;

where: F is the magnitude of the pressure support, N; R is the radius of the i-ro roller, m; gear ratio of the gearbox.

The value of MQJ is determined in the computing unit 16 on the basis of the values of the no-load currents and the value of the ingot width b, it also uses the information about the grade of steel MS and the width of the ingot to calculate the necessary amount of back-up force, as a result of which a signal for setting the back-up value Uani is generated based on the obtained value back pressure in the back pressure sensor 19, a back pressure force signal Uni is generated, which in the adder 20 is added to set the back pressure Ujni- The received control signal Uyi is received and the values of pressurization regulator 17.

Thus, the computing unit 16 acts on the control systems of the radial 12, curvilinear 13, horizontal until the liquid phase 14 closes and horizontal after the liquid phase 15 is closed, maintaining the optimal predetermined distribution of the ingot pulling forces in all the sections, and also creates backwater values using the regulators 17 necessary support in the curved section, which leads to a decrease in the likelihood of cracking during extension in the curved section, resulting in improved quality of the merged a.

Claims (1)

A device for automatic control of an electric drive of a pull-pull device of a continuous casting machine with a multi-roll pull-pull device and pull-roller rotation motors, comprising current sensors of pull-roll motors located in radial, curvilinear, horizontal sections before closing the liquid phase and horizontal sections after closing the liquid phase and having the ability to measure total currents in these areas, the inputs of which are connected to the computing unit, control systems dv hammers made with the possibility of regulating radial, curvilinear, horizontal before closing the liquid phase and horizontal after closing the liquid phase sections, the inputs of which are connected to the computing unit, characterized in that each of the curved section motors is additionally equipped with a current sensor, a regulator of the backwater value, a sensor the amount of backwater and the adder, and the inputs of the adder are connected to the outputs of the computing unit and the outputs of the sensors of the magnitude of the backwater, the inputs of the magnitude controller The backwater is connected to the outputs of the adder and the outputs of the sensors of the total current of the curvilinear section motors, the inputs of the current sensor of each engine are connected to the outputs of the back pressure regulator, and the outputs of the current sensor of each engine are connected to the inputs of the respective rotation roller rotation motors, the inputs of the back pressure sensor are connected to the outputs of the computational block and outputs of current sensors of the corresponding motor.