SU402403A1 - AUTOMATIC REGULATION DEVICE - Google Patents

Description

one

The invention relates to rolling production and can be used to automatically control the speed limit of drives of continuous stands of rolling mills.

A device for automatically controlling the speeds of the rolls of adjacent stands of a continuous rolling mill with a roll driven drive is known, comprising a speed ratio control channel including a speed ratio setting unit, a speed ratio regulator, adjacent speed stand tacho generators, and a tension control channel including a tension meter, tension adjuster and proportional-integral amplifier.

The proposed device differs from the known one in that a multiplying unit and a nonlinear converter are inputted, the input of which is connected to the output of the tension adjuster, and the output to the input is proportional to the integral amplifier, the output of the proportional-integral amplifier and the output of the speed ratio setting output are connected to the duplicating unit the other control input of which is connected to the tachogenerator of the first stand, and the output to the regulator of the ratio of the speeds of the stands.

The drawing shows a diagram of the proposed device.

Two adjacent stands 1 and 2 of the continuous rolling mill are equipped with drive motors 3 and 4 with a feed circuit (not shown). Control device

includes a speed ratio control channel 5 and a tension control channel 6. The speed ratio control channel contains a static speed ratio controller 7 for maintaining. set ratio of speeds, setting unit 8 ratio of speeds for setting the relative speed, multiplying unit 9, on the control inputs of which are connected outputs of setting unit 8 of ratio

speeds of the tachogenerator 10 of the first stand and the tension control channel 6. A multiplication unit is used to form a speed reference. The outputs of the multiplying unit 9 and the tachogenerator 11 of the second stand are connected to the input of the regulator 7, to which, like in the prototype, the current sensor 12 can be connected to compound the speed characteristic of the drive 4 of the second stand to obtain an aperiodic

the law of fall of speed under load. The tension control channel contains a tension meter 13 for converting the magnitude of the force in the gap between the cells into an electrical signal, the tension adjuster 14

to compare a signal with a given value

tensioning and issuing a voltage correction signal via the contactless key 15 to the nonlinear converter 16. The contactless key 15 serves to ensure the operation of the tension channel only in the presence of a strip simultaneously in two cells. Nonlinear converter 16 is connected to the input of a proportional-integral amplifier 17 and has a characteristic that provides an increased transmission coefficient for large error signals. The amplifier 17 is connected to the control input of the multiplying unit 9 and provides a forcedly varying speed correction signal as a function of the intercellular tension and then memorizing it. The device works as follows. When the first lane enters the second kleg, the speed of its engine 4, according to aperiodic law (provided by the setting of the speed ratio adjuster 7), drops sharply. The output signal from the tension meter 13, which is proportional to the amount of tension in the gap, is compared in the setting unit 14 with the specified tension value. From the output of the setting device 14, a signal proportional to the deviation of the tension from the specified value (i.e., the voltage correction signal) is fed through the contactless switch 15 and the nonlinear converter 16 to the input of the amplifier 17. The nonlinear converter 16 has a characteristic that provides an increased transmission coefficient large correction signals arriving at its input, therefore, the amplifier 17 outputs to the input of the duplicating unit 9 a forcedly varying speed correction function as a function of cell tension.

The law of change of the transfer coefficient of the nonlinear converter 16 as a function of the correction signal allows an accelerated (at least two to three times, compared with the optimal setting) system to reach a given equilibrium position with almost no overshoot.

The greater the difference between the actual and zidanny tension of the metal in the gap between the spaces, the more significant at the output of the amplifier 17 is (and due to the I channel is remembered) a correction signal, entered as a factor on one of the control inputs of the multiplication unit 9. the signal from the setter 8 of the speed ratio, which is used in the initial setting of the turns of the rolls of the stand 2. The second factor of the multiplying unit 9 is a signal proportional to the speed of the first stand, arriving at the second the control input of the multiplying unit 9 from the tachogenerator 11 of the first stand. From the output of the multiplier unit 9, the signal is fed to the input of the controller 7 of the ratio of speeds and is the master for this controller. If the speed of the first stand now changes, the ratio controller 7 will set the speed of the second stand in accordance with the changed ratio setting adjusted by the amplifier 17 of the tension channel.

When the strip leaves the second stand, its engine speed increases by

static error; if the next band has parameters close to the previous one, then when it enters the second stand, the drive of the stand at the end of the dynamic drop in speed in the minimum time will come out almost without error,

preset tension level.

Subject invention

Automatic control device

speeds of the rolls of adjacent stands of a continuous rolling mill with a separate drive of rolls, containing a channel for adjusting the ratio of speeds, including a unit for the ratio of the speeds of the stands, a regulator

ratios of speeds, tachogenerators of adjacent stands and a tension control channel, including a tension meter, a setpoint adjuster and a proportional-integral amplifier, characterized in that

preventing the correction of the voltage correction signal, a multiplying unit and a non-linear converter are inputted to the device, the input of which is connected to the output of the tension adjuster, and the output is connected to the input of the proportional-integral amplifier, the output of the proportional-integral amplifier and the output of the speed ratio setting device are connected to unit whose other control input is connected to

tachogenerator of the first stand, and the output - to the regulator of the ratio of the speeds of the stands.