SU692650A1 - Strip tension automatic regulator - Google Patents

Description

(54) DEVICE FOR AUTOMATIC REGULATION OF STRIP TENSION

The invention relates to control and control devices of rolling mills, reacts to measuring the tension of a rolled material, and can be used in systems for automatic control of strip tension, for example, in hot rolling mills.

A device for adjusting the tension of a strip on a rolling mill with a looping holder is known, which includes a meter deviation of the angle of rotation of the looping holder from a predetermined value, connected to the control system of the roll stand motors of the previous stand, to the metering deviation of the load torque on the looper shaft from the predetermined value, which is also connected to the circuit Vgshkov engine control of the leading cage C.

The disadvantage of this device is that when working out loop disturbances caused by changes in the speeds of the main engines of the previous or next stands, its speed is not enough, due to the inertia of the mechanical part of the looper drive.

f The closest to the described,

 The technical essence and output result is a device for adjusting the drive of the looping holder, which contains the speed control motors; the ice hub, the sensor

1g6ka looper motor, current regulator of the motor loop holder, regulator torsorosti glavnzgo

0 drive cage, function conversion units, three-position controller for correcting the set value, scrambart, control unit, loop controller, digital speed generator

5 main drive, integrator, unit speed control of the looping holder, looping angle sensor.

At 3toM, the output is three-fold

The controller 0 is connected to the setpoint input of the speed of the main drive, the outputs of the function conversion units are connected to the cyMMatopoM, and the output of the latter is connected to the input of the setpoint tensioner. The sensor of the eye of the looper is connected via an amplifier to the input of the speed control of the main drive. Signals from the sensors of the presence of metal and the subsequent stand are sent to the input of the control unit. The inputs of the control unit are connected to the inputs of the loop controller, the speed controller of the looper motor. The adjustment of the position of the gate driver is carried out by acting on the speed controller of the stand. The stand speed is corrected in three channels from the loop control, the integrator, and the third {cognitive control knob, which affects the C2-spacing controller of the main drives. In the knob drive controller. the body is provided with the independence of tension of the strip on its angle of rotation, and the motor torque determines with the expression, (eL, T) M9an where CL is the angle of lifting of the loop carrier MWb — torque of the loop holder motor, reduced to the shaft of the strap lever; static moment on the shaft of the looper. In transient conditions, the regulation error will mainly be determined by the moment of inertia of the looper drive. In order to reduce the error in the regulation, they tend to reduce the moment of inertia of the looper drive, using special design drives or replacing them with hydraulic or pneumatic ones. This device, in KOHtype, controls the position of the looper (loop control loop), is carried out in three channels: from a loop of the loop, an integrator and a three-point controller that acts on the unit of the speed of the main drive of the stand. When changing the speed of rotation of the rolls of one of the adjacent stands of the gap, there will be no disturbance to the tension control loop, i.e. At the moment Mgij will be changed due to the fact that the controller registers this independence of the angle of the curtain rod and the main component of the system will be affected by the dynamic component of the engine torque. The increase in speed is limited to the region of stability of the control system and to the energy-induced possibilities of the water holder. The drawback of the device is the lack of dynamic error when working out the disturbances in the bandwidth in turn, which reduces the speed of the device. The purpose of the invention is to improve the accuracy and speed of tension control. The goal is achieved by the fact that a device containing a tension control loop and a loop control circuit, the first one containing a loop holder motor, the input of which is connected to current loop sensors, voltage, looper angle and with a current rectifier output through a controlled rectifier, The inputs of the current controller are connected respectively to the output of the speed controller of the looper motor through the setpoint adjuster and to the output of the current sensor, which, like the output of the voltage sensor, is connected with the input of the multiplication unit, the output of which is connected to the input of the speed controller of the looper motor, the output of the looper angle sensor is connected to the input of the adder through the functional converter blocks, and the looper position control loop contains the main drive of the stand drive, whose inputs are connected respectively to the controller outputs loops and integrator and through the speed master with the output of the three-position controller, the input of which is connected to the output of the unit, control, other outputs They are connected respectively to the inputs of the loop controller, integrator and speed controller of the looper motor, and the regula toron gate input is connected to the loop through the second functional converter, a digital speed sensor of the adjacent mill stands, an amplifier and a second gauge are entered. an integrator, the outputs of these speed sensors are connected to the input of the amplifier, the output of which is connected to one of the inputs of the speed controller of the looper motor, while the second integrator is included in the center The feedback loop of the amplifier is such that its input is connected to the output of this amplifier. functional diagram of the automatic tension control of the strip on the rolling mill is shown in the drawing. The device consists of "a tension control loop containing a looper motor 1, a controlled rectifier 2, looper motor current regulator 3, loop speed motor 4 regulator, unit 5 multiplying, sensor 6 of the angle of rotation of the looper, blocks 7, 8, 9-functional converter, adder 10, tension setting device 11, looper motor current sensor 12, voltage sensor 13 engine looper, amplifier 14 and integrator 15

The device also contains a loop for adjusting the position of the Petleder. Tel, which consists of the main drive 16 of the stand, the controller 17 for the speed of the main drive, the controller 18 for the loop, the integrator 19, the second functional converter 20, the digital sensor 21 for the speed of the main drive, the setpoint 2 for the speed of the main drive control unit 23, three-position controller, torus 24, and in addition, it contains gauge motor speed sensor 25.

The device works as follows.

The strip in the rolling process, impacting the looping roller, T1 replaces the torque of the engine 1 of the looping holder. The actual current of the engine core of the driver1 is measured at noMooQi current sensor 12, the setting device 11 sets the value of the current of the engine 1, and through blocks 7, 8.9 of the pickup converter provide compensation for the weight of the looper, the weight of the strip and the setting of the tension value depending on magnitude of the position angle of the looper zhatel. The adder 10 determines the current limit zone of the setting device 11. The signal; from the speed controller 4 is fed to the input of the current controller 3. When determining a given rotational speed, there are two modes of operation: lifting by a certain angle at a given rolling tension and returning the looper to its initial position preliminary exposure | to prevent impact against the stop. The loop regulator 18 maintains the looped position of the looper by changing the speed of the main drive. The next stand, the speeds of the rolls of the adjacent stands are asgebraically subtracted at the input of amplifier 14, and the amount of deviation after amplification and integration is fed to the input of the same amplifier, Te the input of the controller 4 for the speed of the drive of the looper will introduce a signal corresponding to the derivative of the difference in the speeds of the rolls of the adjacent stands, which is equivalent to the introduction into the control channel of the second zvodnoy of tension bands according to the relationship

T KS (Vj.i - Vi) dt, where T is the tension of the strip;

K - coefficient of proportionality; - roll speeds i

and {1 + 1) -th stands, Speed controller 4, acting on the current controller 3, will change the moment

engine 1 looping holder, skompen ;, siryaet dynamic component of the engine torque looper MjttH, which will reduce. dynamic system error and increase its speed and accuracy of regulation.

The operation of the speed controllers 4 and 18 loops, the integrator 19 and the three-position controller 24 is controlled by block 23,.

Introduction to the motor speed controller of the looper signal, corresponding to the derivative of the relative speed difference of adjacent stands, increases the speed of the tension and regulation controller,

reduces the dynamic error by 1.52 times due to the preemptive change of the torque on the shaft of the looper.

20

Claims (2)

Invention Formula A device for automatically adjusting the tension of the strip, containing a tension control loop and a loop control loop, the first comprising a loop drive motor, the input of which is connected to current sensors, voltage, angle of the Holder loop and with the current regulator output via a controlled rectifier the driver, and the inputs of the current controller are connected respectively to the output of the speed controller of the Loopwinder5 | dater motor through the tensioner and to the output of the current sensor, which, like the sensor output It is connected to the input of the multiplication unit, the output of which is connected to the input (the speed regulator of the motor pet0 of the handler, the output of the angle-holder sensor is connected to the input of the adder through the functional converter units, and the control loop of the main drive of the stand, the inputs of which are connected respectively to the outputs of the loop controller and the integrator and through the task: IR speed with output 0 of a three-position controller, the input of which is connected to the output of the control unit, the other outputs of which are connected respectively to the inputs of the loop controller, the integrator and the speed controller of the looper motor, and the input of the loop regulator is connected via the second function converter to the looper angle sensor output This is due to the fact that, in order to increase the accuracy and speed of regulation, it additionally introduces digital speed sensors for the main drives of adjacent stands from the mill, an amplifier and an integrator, the outputs of these speed sensors are connected to the amplifier input, the output is connected to one of the inputs of the speed controller of the looper motor, and the integrator is connected to the amplifier feedback circuit so that its input is . Sources of information taken into account in the examination 1, USSR Author's Certificate 279551, cl. B 21 B 37/06, 1969. 2. Heindef Adoff Rege einrichtung for Hauptantreibe and SchPingenheberantreibe fon Breitband - Pertig - Simens-Z, 1966, 40, 11,795-799.