SU915998A1 - Apparatus for compensating back-up roll eccentricity - Google Patents

Description

The invention relates to control and regulating devices for rolling mills, namely, devices for compensating eccentricity, support rolls.

The invention can be used to create systems for complex automation of rolling mills (cold rolling) with individual | θ drive of the work rolls.

A device for controlling a rolling mill, containing a roll solution meter, a rolling force meter, a rolling force regulator and a control unit, to the inputs of which signals are received from a roller solution meter and a rolling force regulator, is known. The device maintains the constancy of the roll gap by adjusting the stiffness of the adhesive *** [1].

The disadvantage of such a device is that in the rolling process with the help of a manual setter, the operator changes the rigidity of the stand, as well as the need to use a high-speed hydraulic pressure device.

A device for compensating the eccentricity of the support rolls ’θ is known.

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rolling mill stands containing converters of the angular position of the support rolls into a discrete electrical signal and a rolling force sensor connected to a computer. The signal for adjusting the eccentricity is fed to the control unit of the work roll motors as a function of the angular position of the eccentricities of the support rolls [2].

The disadvantage of such a device is that prior to rolling, it is necessary to determine the maximum eccentricity value of each of the backup rolls and the corresponding angular position of the support rolls, which is spent machine time, the mill stands idle, its performance decreases.

The closest to the proposed technical essence and the achieved result is a device to compensate for the eccentricity of the support rolls of the quarto mill stand, which contains a rolling force sensor, a rolled steel thickness gauge, a tachogenerator, a rolling force variable component, a summing amplifier, a block

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selection of the envelope, the control unit of the search for the antiphase position of the eccentricities of the support rolls, the block of logical information processing, the tracking unit, the matching unit and the speed regulator of the driving motors of the five rolls. ^!

The essence of the device implementing this method is that the support rolls are brought into such a position that the minimum distance 10 from the center of gravity of one support roll to the rolling line corresponds to the maximum distance from the center of gravity of the other support roll to the rolling line, after which 15, they are found in the position found by adjusting the rotational speed of the work roll in contact with the support roll of a smaller diameter [3].

The disadvantage of this device lies in the fact that before filling the rolls into the cage, the operator needs to know the diameters of the support rolls. And set the engine selection switch to the appropriate position. 25 what the time and attention of the operator is spent on. In this case, the wrong setting is possible, "switch.

The purpose of the invention is to improve the accuracy of maintaining the antiphase position of the eccentricities of the support rolls and automate the self-tuning device.

This goal is achieved by the fact that the device for compressing the eccentricity of the support rolls., Containing? ® rolling force sensor, the output of which is sequentially connected to the block for extracting the variable component of the rolling force, to the adder, to the second input of which is rolled the thickness gauge the envelope, the logical information processing unit and the control unit for the search for the antiphase position of the eccentricities of the support rolls, one 45 entrance of which is connected to the stand tachogenerator, and the second to the block information processing, and the output is connected to the speed regulator of the drive motors of the stand, additionally contains a full speed sensor for one of the support rolls, two pulse sensor support rolls, a control unit, counters, comparing devices, a tracking unit, a logic unit, a code-to-analog converter, the rotational speed sensor of the support roll being connected to the input of the control unit, two outputs of which are soybeans, are connected to counters, and the third output is connected to comparing devices and logic unit, impulse sensors All the support rolls are connected to the co-counters and the tracking unit, respectively, the outputs of the counters are connected respectively to the summing 65

and subtractive inputs of comparing devices, the outputs of which are connected to a speed controller and a logic unit, one of the inputs of which is connected to a logical information processing unit, and the output is connected to a speed regulator, the input of the tracking unit is connected to a logical information processing unit, and analogue - with speed regulator.

The drawing shows a block diagram of the device.

- The output of the rolling force sensor 1 is connected via a block. The unit 2 for extracting the variable component of the rolling force with the input of the summing amplifier 3, the second input of which is connected to the gauge of thickness 4. The output of the summing amplifier 3 through the envelope extraction block 5 is connected to the inputs of the logical information processing block and the anti-phase search control control unit 7 of the backup roll eccentricities, the second input of which is connected to the tachogenerator of the stand 8. The output of the block 7 is connected to the input of the speed regulator 9, the outputs of which are connected , with drive motors 10 and 11, rotation through work rolls 12 and 13, support rolls 14 and 15, respectively.

The outputs of the sensors 16 and 17 pulses of the support rolls 14 and 15 are connected to the inputs of counters 18 and 19 and the tracking unit 20. The output of the sensor 21 of the turns of the support roll 14 is connected to the input of the control unit 22, the outputs of which are connected to the inputs of counters 18 and 19, comparing devices 23 and 24 and logic block 25. The output of the counter 18 is connected to the summing input of the comparing device 23 and the subtraction input of the comparing device 24, and the output of the counter 19 is connected to the summing input of the comparing device 24 and the subtraction input of the comparing device 23. The outputs are The units 23 and 24 are connected to the inputs of the logic unit 25 and the speed controller 9. The inputs of the logic unit 25 and the tracking digital unit 20 are connected to the output of the logical data processing unit b. The output of block 20 through the Converter 26 code-analogue is connected to the input of the speed controller 9, one of the inputs of which is connected to the logic unit 25.

The device works as follows.

The signal from the rolling force sensor 1 is fed to the input of the variable force extraction component 2 of the rolling force, from which the envelope signal goes to one of the inputs of summing amplifier 3, to the second

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A swarm whose input receives a signal from the gauge 4 gauge. From the output of the summing amplifier 3, the difference signal is fed to the input of the envelope block 5. The envelope of the alternating signal of the rolling force is a sinusoid whose amplitude varies with time ₍ from maximum to minimum, value and characterizes the divergence of the eccentricities of the support rolls from the antiphase position. "

The envelope signal from the output of block 5 is fed to the input of block 6 of logical information processing and block 7 control search anti-phase position of the eccentricities of the supporting 15 rolls. If the amplitude of the envelope is not zero or does not have a minimum value, block b gives the command to block 7 to issue a search signal.

The input of block 7 receives a signal 20

tacho generator stands 8. The search signal is positive if the amplitude of the envelope decreases, and negative if it increases. The magnitude of the search signal does not exceed 3% of the magnitude of the tacho signal. The search signal enters the speed controller ^ of the rotation of the work rolls to change the speed of rotation of the support roll of a smaller diameter. state of emergency

The first impulse from the sensor 21 turns of the support roll 3 4 of the control unit 22 opens the inputs of counters 18 and 19, which begin to count the pulses from the sensors 16 and 17 of the impulses of the support rolls 14 and 15.

respectively. The second impulse from the sensor 21, i.e., the support roll 14 made one turn, the block 22 closes the inputs of the counter 18 and 19, simultaneously opens their outputs and the inputs of the matching devices 23 and 24. The pulses from the output of the counter 18 enter the addition input comparing device 23 and the input of the subtraction of comparing device 24, and the pulses from the output 45 of counter 19 are fed to the summing input of the comparing device 24 and the subtracting input of the comparing device 23. This input of pulses allows you to automatically determine the support roller of smaller diameter. For example, if the comparison device 23 works, then this means that the counter 18 counted more pulses than the counter 19, i.e. The support roll 14 rotates faster than the support roll: a roll 13 means its diameter is smaller.

When the comparing device 23 or 24 is triggered, the keys in the 9-speed controller are closed to pass the search signal to a change in the speed of rotation of the work roll in contact with the support roller of a smaller diameter. Keys self-blocking 65

and remain in a closed state until the new transfer of rolls.

The second pulse from the sensor 21, the control unit 22 opens the inputs. logic unit 25, which receives signals from the outputs of the comparison devices 23 and 24 and block 6 logical information processing. With equal diameters of the support rolls, the signals from the outputs of blocks 23, 24 and 6 (the signal of the envelope derivative is zero) will be zero. In this case, block 25 closes one of the keys in the speed controller 9 for passing the search signal.

The signals from the sensors 16 and 17 pulses are continuously fed to the inputs of the tracking digital unit 20. The antiphase position of the eccentricities of the support rolls comes at a time when the envelope amplitude has a minimum value. This position of the support rolls fixes the block of logical information processing and gives the command to block 20, which subsequently monitors the antiphase position of the support rolls.

Tracking is as follows. In order for the eccentricities of the support rolls to be in antiphase position, it is necessary to keep the rotational speeds of the support rolls equal, i.e. the number of pulses per revolution of the support roll 14 must be the same as roll 15, or vice versa.

Block 20 continuously determines the difference between the number of pulses from sensors 16 and 17. As can be seen from the above, this difference should be equal to zero. If it is greater than zero, then through the code-analig converter 26 a signal is output to the speed regulator 9 to brake the work roll, 'in contact with the support roll of a smaller diameter. Regulatory impact is issued until the difference is equal to zero.

With digital control of the work roll electric motors, the search signal through the converter 27, an aalog code is output to the speed regulator 9, and a control signal in the code from the output of the block 20 enters the speed regulator 9.

The proposed device 'automatically determines the support roll of a smaller diameter. Thus, the operator of the mill is freed from the need to follow when filling the rolls in the cage, where is the roll and set the engine selection switch to the desired position. Through the use of a digital tracking unit increases the accuracy of maintaining the antiphase position of the eccentricities of the support rolls, which reduces the longitudinal thickness variation of the rolled metal and improves its quality

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Claims (1)

Claim A device for compensating the eccentricity of the support rolls, comprising a rolling force sensor, the output of which is. th successively connected to a block selection ► variable component ^e the rolling force, the adder, to the second input of which the treadmill thickness gauge is connected, the envelope extraction unit, the logic unit. information processing and control unit search for the antiphase position of eccentricities Support rolls, one input of which is connected to the tachogenerator of the cage, and the other - to the logical processing unit of information, and the output cj & Dine ^^^ speed regulator drive ^ of the stand cage differs from ^ '(c, i by the fact that, in order to increase m ^ ados ^ and maintain antiphase 20 the eccentricities of the support rolls and the automation of the self-tuning device, it additionally contains a sensor. full revolutions of one of the support rolls, two pulse sensors 25 support rolls, control unit, counters, comparing devices, tracking unit, logic unit, the code converter is analogous, the speed sensor of the support roll is connected to the input of the control unit, two outputs of which are connected to counters, and the third output terminal is connected to comparing devices and logic unit, the sensors of pulse rolls of the support rolls are connected respectively to the counters and tracking unit, the outputs of the counters connected respectively to the summing and subtracting inputs of the comparison devices, the outputs of which are connected to the speed regulator and the logic block, one of the inputs of which is connected to the logic block th information processing, and the output -. with speed control, the follower ·· input unit connected to the information processing logic unit, and output through analog converter code- with speed control.