SU915993A1 - Apparatus for compensating back-up roll eccentricity - Google Patents

Description

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

The invention can be used to create a system for the integrated automation of rolling mills with individual grades of work rolls.

The closest to the proposed technical essence and the achieved result is a method and a device for compensating for the eccentricity of the support rolls of a rolling mill stand, containing drives of working rolls, a tachogenerator of the stand, a rolling force sensor, a block for extracting the variable component of the rolling force, 'sum-; torus, gauge thickness, block ^ envelope selection, logic information processing unit, control unit ^{* 1 for} the search for the antiphase position of the supporting rolls eccentricities, tracking unit for this position, matching block and speed controller, with rolling force sensor, variable selection unit the component of the rolling force, the adder, the envelope selection unit and the logic processing unit, information are connected in series, the output of the roll thickness gauge is connected to the second input of the adder, the output of the allocation block og The driver is connected respectively to the first input of the control unit for the search for the antiphase position of the eccentricities of the support rolls and to the first input of the tracking unit, the second inputs of which are connected to the output of the logical information processing unit, the outputs of the control unit

. _ a search for the antiphase position of the eccentricities of the support rolls and the tracking unit through the matching unit connected to the first input of the speed controller, the first and second outputs

20 which are connected respectively with the drives of the work rolls * [1].

The essence of the device lies in the fact that the rolling force sensor (massdose) determines the load on the work rolls and the associated supports

25 rolls. Messdose through the block selection of the variable component of the force and the summing amplifier is connected to the block selection envelope. The output of the thickness gauge is connected to the second input of the summing amplifier.

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tackle installed at the entrance of the strip into the cage. The envelope signal enters the logical information processing block, which controls the operation of the antiphase position search control unit and the next block that controls this position.

If the amplitude of the envelope does not have a minimum value, the logical processing unit instructs the block — control the search for the 10th phase position of the eccentricities of the support rolls to produce a search signal that is connected via a matching unit to the speed controller associated with the drive motors of the 45 work rolls. Once eccentric--.

The support rolls will occupy an antiphase position, a logical processing unit. the information is banned from issuing the search signal, and connects 20 through the matching unit to the speed controller of the tracking unit, which tracks this position during the rolling process.

The search and tracking signals are fed to the drive of the work roll that is in contact with the smaller diameter roll. The choice of the drive of the work roll occurs depending on the position of the switch installed in the desired position when filling the rolls in the cage [1].

The disadvantage of the known device

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implementing this method is that before the filling of the rolls in the cage. The operator needs to know. The diameter of the 35 support rolls and set the switch in the matching unit to the appropriate position, which takes the time and attention of the operator.

The purpose of the invention is the efficiency of control 40 and. automating self-tuning devices. '

This goal is achieved by the fact that in the device to compensate for the eccentricity of the support rolls, 45

containing drives of work rolls, tachogenerator of the stand, rolling force sensor, unit for extracting the variable component of the rolling force, adder, treadmill thickness meter, envelope extractor unit, logical information processing unit, unit _? control of the search for the antiphase position of the eccentricities of the reference legs, the tracking unit for this position, matching unit, speed regulator, the rolling force sensor, the rolling force variable component extraction unit, the extension unit, the envelope extraction unit and the logical information processing unit are connected in series, the output gauge thickness rolled together with the second input of the adder, the output of the block selection envelope is connected respectively to the first input of the control unit 65

The first input of the tracking unit, the second inputs of which are connected to the output of the logical information processing unit, the outputs of the control unit of the search for the antiphase position of the eccentricities of the backup rolls and the tracking unit through the matching unit are connected to the first input of the speed controller, the first and second the findings of which are connected respectively to the drives of the work rolls, further comprises a speed sensor of one of the support rolls, two pulse sensors op pirnyh rolls, two counters, a control unit, two comparison units and a logic unit, with the rotational speed sensor of the support roll connected to the first input of the control unit, impulse sensors of the support rolls respectively connected to the first inputs of the counters, the second inputs of which are connected to the first and second outputs of the controlling unit, and their outputs are connected respectively to the subtractive and summing inputs of two comparing units, one of the outputs of each comparing unit is connected to the inputs of the control unit, the second outputs are compared blocks connected to the inputs of the speed controller and. with the inputs of the logic unit, the third input of which is connected to the output of the envelope selection unit, and the output of the logic unit is connected to the speed controller, the output of the clephony tachogenerator is connected via the matching unit with the input of the control unit for the search for the antiphase eccentricities of the backup rolls.

The drawing shows a structural diagram of the proposed device.

The outputs of the sensors 1 and 2 pulses are connected to the inputs of counters 3 to 4, respectively, the output of the sensor 5 turns of the support roll 6 is connected to the input of the control unit 1, whose two outputs are connected to the second 'inputs of counters 3 and 4. The outputs of counters 3 and 4 are connected to the corresponding the inputs of the comparison blocks 8 and 9, one output of which is connected to the second and third inputs of the block 7. The second output of the block 8 is connected to. one of the keys of the speed controller 10 and one of the inputs of the logic unit 11, the second output of the block 9 is connected to another key of the speed controller 10 and. another input of the logic unit 11, and the output of the block 11 is connected to one of the keys of the speed controller 10.

The output of the rolling force sensor 12 is connected via the variable force extraction unit 13, the adder 14, the envelope extraction unit 15 (filter) to the inputs of the block 16 logi5

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information processing unit 17. search control for the antiphase position of the eccentricities of the support rolls, the tracking unit 18 and the third input of the logic unit: a 11. The second input of the adder 14 is connected to the output of the gauge 19 of the roll-up thickness. The output * of the logic information processing unit 16 is connected to the second inputs of blocks 17 and 18. The output of the tacho-generator 20 of the stand through the matching unit 21 is connected to the third input of the unit 17. The outputs of the blocks 17 and 18 through the matching unit 22 are connected to the input of the speed regulator 10, associated with drive motors 23 and 24 of the cage, rotating work rolls 25 and 26, respectively.

The signals from the sensor 5 turns of the support roll 6 go to the control unit 7. The first pulse from the sensor 5, block 7 opens the inputs of counters 3 and 4, which begin to count the pulses from the sensors 1 and 2 pulses, respectively. The second impulse from sensor 5, i.e., the supporting roll 6 made one revolution, closes the inputs of counters 3 and 4 and simultaneously opens their exits. The pulses from the output of the counter 3 are fed to the addition input of the comparing unit 8 and to the subtraction input of the comparing unit 9. The pulses from the output of the counter ·. 4 is fed to the input of the addition of the comparison unit 9 and the input of the subtraction of the comparison unit 8.

This input codes of pulses allows you to automatically determine the support roller of a smaller diameter. For example, if the diameter of the support roll 6 is less than the support roll 27, this is. This means that its rotation speed is higher, and, therefore, counter 3 will count more pulses than counter 4 in the time between two pulses from the sensor 5 turns. Comparison unit 8 only works if there is a positive difference between the pulse codes and closes the key in the speed controller 10, thus preparing the circuit for passing the search signals for the antiphase position of the support roll eccentricities or the tracking signal for this position. The keys are self-locking and in this state are located until the next transfer of the support rolls.

Signals from the output of the matching blocks 8 and 9 go to logic block 11, the third input of which receives the envelope signal from the output of block 15. The need to use block 11 is caused by the case when ‘the supporting rolls have different diameters, which is very rare in practice.

In this case, the signals from the outputs of the matching blocks 8 and 9 will be zero, and from the output of the envelope extraction block 15 - a certain size, and the block

11 closes one of the keys in the speed controller 10 to pass through the unnamed signals.

The signal from the sensor 12 efforts rolling through the block 13 selection of the variable component of the pressure is supplied to one of the inputs of the adder 14, the second input of which receives a signal from the gauge 19 of the roll. The difference signal, caused by the eccentricities of the upper and lower support rolls, is fed to the input of the selection block of the envelope of this signal, which is a low-pass filter ,. The amplitude of the envelope characterizes the divergence of the eccentricities of the support rolls ότ of antiphase position, i.e. from the position when the maximum eccentricity of one support roll corresponds to the minimum of the other. From the output of block 15, the envelope signal enters the inputs of the logical information-processing block 1§, the search control anti-phase logic block 11 of the eccentricities, the matching G7 block and the tracking block 18.

If the eccentricities of the support rolls are not in an antiphase position, the logical information processing unit 16, after analyzing the envelope signal, gives the command to block 17 to output a search signal for the antiphase position of the support roll eccentricities. The magnitude of the search signal can be up to 4% of the magnitude of the tachogenerator signal 20 of the stand entering block 17 through matching block 21, which does not cause disruption of the rolling process. The sign of the search signal is determined by the sign of the derivative of the envelope signal, i.e. depending on whether its amplitude decreases or increases. In the first case, the sign of the search signal will be positive, and in the second - negative. Signal search allows you to reduce the time of arrival of the eccentricities of the support rolls in antiphase position.

As soon as the eccentricities of the support rolls take an antiphase position, the logical information processing unit 16 commands the block 17 to stop the search-signal input, and the tracking block 18 gives the command to memorize the magnitude of the envelope signal corresponding to this position.

Further, if there is a difference in the diameters of the support rolls, their eccentricities will begin to diverge from the found antiphase position, which will cause an increase in the signal at the input of the tracking unit 18. When the input signal exceeds the signal size stored in the memory of tracking unit 18 and corresponds to the antiphase position of the eccentricities of the support rolls, unit 18 outputs sig7

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the return of the eccentricities of the support rolls to the antiphase position. The signal is issued until the signal at the input of block 18 becomes equal to the signal stored in its memory, i.e. eccentricities of support rolls of steel in antiphase. So ^{3 is} carried out tracking the phase position of the eccentricities of the support rolls.

The search and tracking signals are received through matching unit 22 and. through the keys, closed at the command of the block 8.9 or 11, to the speed regulator 10, which changes the speed of rotation of the work roll in contact with the support roll of a smaller diameter 15.

The supply of the control action to the drive of the work roll in contact with the work roll of a smaller diameter is due to the fact that this 20

roll, having a large angular velocity relative to the second support roll, in the process of rolling tends to overtake him. This causes the eccentricities of the support rolls 25 to diverge from the antiphase position. Therefore, the braking of the work roll in contact with the support roll of a smaller diameter is more noticeable than an increase in the rotational speed of the second work __ roll and less effect on the speeding process.

Growth rolling.

Thus, the proposed device, along with the compensation of the eccentricities of the support rolls, gives __ the opportunity to quickly manage it "to automate its self-tuning. To free the personnel of the mechanical section from the need to measure the diameters of the support rolls and transmit this information to the mill operator, and 40 operators to follow each once with the filling of the rolls into the scream, after which roll where it stands, and set the selection switch of the drives of the working rolls to the desired position, as in the known device.

The proposed device allows to improve the quality of the rolled strip in thickness, reduce operating costs and, as applied to cold rolling mill for processing non-ferrous metals, obtain an economic effect of about 260 thousand rubles per year.

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Claims (1)

Claim. A device for compensating for the eccentricity of the support rolls, containing drives for the work rolls, a tachogenerator 60 of the stand, a rolling force sensor, a variable component extraction unit -. rolling force, adder, tarpaulin thickness gauge, envelope extraction unit, logical information processing unit, antiphase position search control unit ^ eccentricities of support rolls, tracking unit for this position, matching unit, speed regulator, with rolling force sensor, variable component extraction unit the rolling forces, the adder, the envelope selection unit and the logical information processing unit are connected in series, the output of the roll gauge is connected to the second input of the adder, you the course of the envelope selection unit is connected respectively to the first input of the anti-phase search control unit of the eccentricities of the support rolls and to the first input of the tracking unit, the second inputs of which are connected to the output of the logical information processing unit, the outputs of the anti-phase search eccentricities control unit of the eccentricities of the supporting rolls and the tracking block through the matching block connected to the first input of the speed controller, the first and second outputs of which are connected respectively to the work roll drives, I distinguish Taking into account the fact that, in order to speed up the control and automate the self-tuning of the device, it additionally contains a speed sensor for one of the support rolls, two pulse sensors for the support rolls, two counters, a control unit, two comparison units and a logic unit, the speed sensor of the support roll being connected to the first input of the control unit, the pulse sensors of the support rolls, respectively, are connected to the first inputs of the counters, the second inputs of which are connected to the first and second outputs of the control unit, and their outputs are connected to responsibly with the subtracting I summing inputs of two comparing units, one of the outputs of each comparing unit is connected to the inputs of the control unit, the second outputs of the comparing blocks are connected to the speed controller inputs and to the inputs of the logic unit, the third input of which is connected to the output of the envelope selection block, and the output the logic unit is connected to the speed regulator, the output of the tachogenerator of the stand is connected through the matching .block with the input of the control unit of the search for the antiphase position of eccentricities reference x rolls.