SU1704871A1 - Apparatus for compensating rolling stand roll eccentricity value - Google Patents

Abstract

The invention relates to rolling production and can be used when rolling on mills with individual electric rolls. The purpose of the invention is to improve the quality of the rolled strip. It is achieved in that the definition of the eccentricity parameters of each of the rolls is carried out prior to the start of rolling, without directly measuring the geometrical parameters of the rolls by searching for the maximum and minimum values of the rolling force and storing the corresponding angular position of the rolls. This makes it possible to compensate for the change in the roll gap, which is determined by the eccentricity of the rolls, which excludes the influence of disturbing influences that occur in the strip from the entrance to the stand on the eccentricity compensation accuracy. 2 hp f-ly, 3 ill. Ate VI o 4 cx VI

Description

The invention relates to rolling production / and can be used for rolling on sheet mills with individual electric rolls.

A device is known to compensate for the effect of eccentricity rolling mills, containing: ..; a unit for measuring force pro:: -: attacks. Dztchmk speed prkkdtki, connected to the generator of clock mmgilsoa. strip thickness gauge mounted on

the entrance of the stand, the speed sensor of the input strip, the comparison and averaging units.

The essence of the device is that the scaling unit determines the component of the rolling force force caused by the change of the rolling stock, it is subtracted from the current rolling force signal. The resulting value of the rolling force, not containing a component, due to the change in thickness

tackle, averaged over a section of strip equal to the circumference of the barrel of the support roll, and at the output of the comparator unit, a signal of the increment of the pushing force caused by the eccentricity of the rolls used in the p-thicker thickness to compensate for it is generated.

The drawbacks of the device are the complication of the device due to the need to use a strip thickness meter at the entrance of the stand, as well as the inefficiency of its use on reversing mills due to low speed, which is manifested in the stretching of the process of compensating the eccentricity after the complete rolls .

It is also known a device for compensating the rolls beating of a rolling stand, containing a rolling force sensor, an adder connected to the input of the positioning system of the pressure mechanism, compensation blocks for the sine and cosine components of the eccentricity of the support rolls, each of which is additionally equipped with a drive and a logical control unit connected with pulse and positional outputs of the generator.

Due to this, the process of forming the compensating coefficients of the sinus and cosine components of the eccentricity is divided into cycles equal to one period, which allows reducing the duration of automatic adjustment of the eccentricity compensation channels to a time equivalent to 1.5 turns of the roll.

Due to the fact that the results of measuring the pressure of the previous revolution are used to compensate for the eccentricity, the use of this device leads to an increase in the eccentricity compensation error, especially in mills with individual roll drives having different rotational frequencies.

It is also known a device for monitoring the eccentricity of rolls of a rolling mill comprising a sensor mechanically coupled with the upper and lower rolls; pulses associated with counters, rolling force sensor, servo valve, connected. the first and second calculating devices generating the correction signals corresponding to the eccentricity and angular phase of the roll, the third computing device implementing the control of phase shift between the upper and lower rolls and the distribution of the signals of the corrected eccentricity and angular phase, that provides the possibility of compensating for eccentricity for mills with individual roll drives.

In addition, the control of the angular position of the rolls makes it possible to use the device on reversing mills.

 and this device has not eliminated the main drawback - the presence of errors in the definition of eccentricity due to the use of measurement results on the previous rolls rollback delaying the control system, which is especially important for reversing mills where relatively short billets are rolled.

In addition, the presence of various disturbances in the strips entering the rollers, the strip thickness difference due to the uncompensated eccentricity in the previous stand of the continuous mill or in the previous passes of the reversing mill, leads to the appearance of disturbances in the rolling force with a frequency close to the frequency of rotation of the stand, which it is difficult to filter them when a variable pressure component is proportional to the eccentricity.

The closest to the invention to the technical essence is a device for compensating the eccentricity of the rolls of the rolling stand, containing pulse and revolution sensors mechanically coupled with the upper and lower rolls and associated with the corresponding counters, a regulator connected to the pressure cylinder servo valve of the press mechanism articulated with position sensor, sensor

rolling force, generators of sinusoidal signals, an adder, a logical signal processing unit that determines the eccentricity parameters of each roll beforehand, by measuring the increments of the rolling force at different relative positions of the rolls without directly measuring the geometrical parameters of the rolls. This makes it possible to compensate for the change in inter-a; ... of the new gap caused by the eccentricity of the rolls, and eliminates the confusion of disturbing influences from the strip entering the cage on the accuracy of the compensation of eccentricity.

However, due to the fact that the deflection of the peels of the pressure deviation is carried out depending on the original upper roll, cases of xsg,;.) And points are possible. The measurements of the deviations of the D.I. h: o meielszhzno but leads to an error of measurement-h.

Taking into account also, that for the determination of the parameters of the exc

are complex trigonometric functions, even minor measurement errors lead to significant errors in the calculations of the roll eccentricity parameters.

The chain of the invention is to improve the quality of the strip by increasing the accuracy of compensating for the effect of the eccentricity of the rolls on the strip thickness.

The goal is achieved by the fact that the device for compensating the eccentricity of the rolls of the rolling stand, containing pulse and revolution sensors, mechanically coupled with the rollers and connected with the corresponding counters, a regulator connected to the pressure cylinder servo valve of the pressure cylinder, coupled with the position sensor, sensor rolling force associated with the variable component extraction unit and the threshold element, keys, generators of sinusoidal signals associated with an adder, the output of which is by means of a key associated with the controller, additionally entered a maximum allocation block, a logic block, a key whose control input is associated with the output of the threshold element, and an output with an input of the regulator, a division element whose input is associated with a variable component selection block, the first, second and fourth inputs of the logic block and the maximum allocation block of the same name are connected in pairs with the upper roll counter, lower roll counter and key, the third logic flea input is associated with the upper roll speed sensor, the fifth the input is connected to the output of the threshold element, the sixth and seventh inputs are associated respectively with the second and fourth outputs of the maximum selection block, the first output of the logic block is connected with the control input of the variable selection block, and the second output is connected with the third input of the maximum selection block also connected to the control input of the key, the output of the dividing element is connected to the fifth input of the maximum allocation unit, the first and second outputs of which are connected to the inputs of the first generator of sinusoidal signals, and the third and fourth outputs odes with inputs of the second generator.

The magnitude of the AZE and D Re when rolling an absolutely rigid strip are related by dependence

JSC "LRE"

(one)

where M is the rigidity of the roll system.

The overall change in the roll gap AZE is determined by the influence of the eccentricity of each of the rolls and their relative position and can be represented by the dependence

AS Av sin (Ob + j) +

sin

& n + ph)

(2)

where Aa and AH are the eccentricities of the upper and lower rolls, respectively;

© в and 0н are the current angles of rotation of the upper and lower rolls relative to the initial fixed position;

(pj and ph is the angle of the phase shift of the eccentricity of each of the rolls relative to the initial position.

The analysis of expression (2) shows that the knowledge of the values of the coefficients Ab, Au. and under the condition that the current position of each roll is monitored, it allows the value of the roll gap AZE to be preliminarily calculated and correspondingly influences the regulator for compensation.

In the proposed device, the increments of the force AP and the allocation of maximum values for the full rotation of the upper plate are measured, but with the relative positions of the lower roll relative to the upper roll.

The maximum value of these measurements corresponds to the moment of coincidence of the eccentricities of the upper and lower rolls, and the minimum - to the finding of eccentricities in antiphase. Thus, the following simple dependencies can be used to determine the eccentricity amplitude:

A Sign AO + AN A5min AO - AN. Aomax 4- AS min

Av

The compensation of the influence of eccentricity with a roll when adjusting the thickness is carried out taking into account the following.

It is known that the eccentricity of the gap

L So causes the occurrence of n signal

the variable component A re with the period

corresponding to the frequency of rotation of the rolls.

DZm ks AS

 / - - MLG „I - - MITM

.--. --- (3)

To determine the parameters and p, we use the values of the current angles of rotation of the V o and He corresponding to the moments of measurement of the maximum and minimum of the pressure deviation, the phase shift angle of which, ppm jo, to the zero position is equal to 90 electrical degrees. Thus, the global shift of the eccentricities of each of the rolls relative to the initial position is equal to:

tp at -90 ° -0v

# H 90 ° -0n. (4)

FIG. 1 shows a block diagram of the device; in fig. 2 is a block diagram of the maximum allocation; in fig. 3 is a block diagram of a logic block.

The device contains upper and lower work rolls 1 and 2, articulated with them sensors 3 and 4 turns and sensors 5 and b of pulses associated with co-counter counters 7 and 8. sensor 9 rolling force associated with element 10 threshold and block 11 variable component, also connected to the sensor 3 turns of the upper roll, position sensor 13, articulated with a pressure mechanism 12, servo valve 14 connected to the output of the regulator 15. whose input is connected to the position sensor 13, generators 16 and 17 sinusoidal signals, adder 18, keys 19 and 20, characterized in that, in order to improve the quality of the strip by increasing the accuracy of compensating the eccentricity of the mill rolls, it further comprises a maximum extraction unit 21, a logic unit 22, a key 23, the control input of which is associated with the output of the threshold element 10. - the first input of the controller 15, the division element 24, the input of which is connected to the variable component allocation unit 11, the first, second and fourth inputs of the logic block 22 and the maximum allocation unit 21 connected in pairs to the outputs counters 7 and 8 and key 20, the third input of logic block 22 is connected to the sensor of the 3 turns of the upper roll, the fifth input is connected to the output of the threshold element 10, the sixth and seventh inputs are connected respectively to the second and fourth outputs of the maximum selection block 21, the first output of the logic block 22 is associated with the control input of the variable component extracting unit 11, and the second output of the logic unit 22 is connected with the third input of the mechsimum separation unit 21. also connected with a control input of switches 19. The output of dividing element 24 is connected to the fifth input of the maximum extraction unit 21, the first and second outputs of which are W.MASELY with the inputs of the generator 16 of sinusoidal signals, and the third and fourth outputs with generator outputs 17 sinusoidal signals.

The device works as follows.

If it is necessary to measure the eccentricity value (usually after changing the stand rolls), the key 20 is turned on, ensuring that the dumping of the memory elements in the maximum allocation unit 21 and the logic unit 22 is stopped, the rolls 1.2c are given a slight asynchronous rotation frequency. After that, by means of a key 23 from an external source U3 to the input of the regulator 15, the pushing screws 12 are moved, preloading the rolls 1 and 2 to a certain pressure, controlled by the threshold element 10, connected to the rolling force sensor 9. After the trigger element 10 is triggered, the key 23 is turned off and further movement (compression) of the rolls is stopped and permission is given to start the measurements. The eccentricity value obtained from the output of dividing element 24, by dividing the signal proportional to the deflection of the rolling force by the UMK signal proportional to the stiffness modulus of the stand, is measured over a full revolution of the upper roll at different shifts of the lower roll relative to the upper roll. The first measurement cycle starts with the same relative position of the lower and upper rolls, i.e. when the current values of 0V and En are equal and when the sensor 3 turns of the upper roll is triggered.

On the basis of the first measurement, the maximum eccentricity value А5з1 is determined, which, with the values of 0W and 0nt, corresponding to the time of measurement, is entered into the memory elements 34, 35, 36 of the maximum allocation unit 21. The next measurement of the eccentricity value D5E2 is carried out after mutual shift of the upper and lower rolls by a predetermined angle D 0.

This compares the measurement results with the previous D5E1. If this value is exceeded from D8e1, the value of D5e2 is taken as the value of Zamax. which, with corresponding values of 0 to 0, is inserted into the memory elements 34, 35, 36 of the maximum allocation unit 21, instead of the parameters previously recorded in them. In case D5e2 A5E1, the values of the elements 34, 35. 36 of the memory of the maximum allocation unit 21 are stored without change. After each subsequent mutual shift of the rolls by the value of A осуществ, the value of AS3i and

Its comparison with the result of the previous measurement A. 5em. logical processing of the measurement results, the selection and storage of the maximum values of LZemsks and the corresponding values of 0W and

Vit

Taking into account that each new measurement cycle is carried out after the next mutual shift by the angle D0el.grad. the total number of measurement cycles for detecting the maximum of LZieks is equal to

K 36 °

Thus, after completion of the K measurement cycles of the A SMSKC values and the corresponding values of 0V and © n, the maximum possible values of A 5 μsx will be entered into the elements 34, 35.36 of the memory of the maximum allocation unit 21. corresponding to the coincidence of the eccentricities of the upper and lower rolls and the value of 0 W and 0 Nt.

Obviously, the minimum value of the parameter AZmmn will take place when the eccentricities of the rolls are in antiphase, i.e. with a mutual shift between the rolls, equal to Evt - 0nt + 180 °. The AZE value measured here is taken to be A SMUH and entered into the memory element 36 of the maximum allocation unit 21. At this point, the process of measuring the parameters of the eccentricity of the rolls is completed, the key 19 is turned on, providing the possibility of compensating the influence of the eccentricity.

The maximum extraction unit 21 (Fig. 2) contains four keys 25-28. comparison element 29, two pulse elements 30 and 31, inversion element 32, coincidence element 33, four memory elements 34-37, four adders 38-41, the combined control inputs of memory elements 34-37 being the fourth input of the block, the combined inputs of the pulse element 31 and the inversion element 32 are the third input of the block, the combined inputs of the keys 27 and 28 and the first input of the comparison element 29 are connected to the fifth input of the block, the inputs of the keys 25 and 26 are the first and second inputs of the block respectively. The outputs of the adders 38-41 are the second, first, third, and fourth outputs of the block, respectively.

The combined control inputs of the keys 25-27 are connected to the output of the matching element 33, the first input of which is connected to the output of the inversion element 32, and the second input to the output of the pulse element 30 connected to the output of the comparison element 29. The output of pulse element 31 is connected to control input.

key 28, the output of which is associated with the input of the memory element 37, connected with the output with the first inputs of the adders 39 and 40. The outputs of the keys 25-27 are connected respectively

the inputs of the memory elements 34-36, the outputs of which are connected respectively to the second inputs of the adders 38, 41 and 39, the output of the memory element 36, in addition, is connected to the second inputs of the adder 40 and the element 29

compare. The second inputs of the adders 30 and 41 are connected to the Ugo signal.

The order of operation of the maximum selection unit is as follows.

At the time of the start of measurements and compensation of the eccentricity, a reset signal is taken from the elements 34-37 of memory, which provides preparation for the start of operation of the unit. In the process of measuring the value of A5e at the fifth input

directly arrive at the first input of the comparator element 29, at the output of which a signal is formed when the value of the first input exceeds the second one. Considering that prior to the start of the measurement, the memory element 36 is set to the zero position, at the moment when the value A A1 arrives at the fifth input, the reference element 29 is triggered to ensure that the pulse key 27 is turned on by the element 30, as a result of which the value A5e1 is entered and is taken as the initial value of the maximum eccentricity AZemax. Simultaneously with the record value.

D5e1, memory element 36 is stored in the memory parameters OW and 0Nt, corresponding to the measurement time A5e1, in memory elements 34 and 35, which is ensured by supplying a logical signal 1 to the control inputs of keys 25 and 26, connected via output element 33 element 30 pulsed. In the second and subsequent measurements, the value of AS3i arriving at the fifth block input is matched on the comparison element 29 with the DZemax value stored in the memory element 36. In case A5E | AZEMAX is triggered element of the comparison 29 and the value of A 5e is transferred to the element

36 of the memory and is adopted as the new initial value A. Zamax. At the same time, the comparison element 29 through the pulse element 30 and the coincidence element 33 ensures the inclusion of the keys 25, 26 and the transfer

elements 34 and 35 of the memory of the new values 0hT and Opt. corresponding to the time of measurement A Sji.

In case the AS3i - AZemlks element 29 comparison fails, the element

34 36 memories are stored pancje recorded values. After a full turn of the lower roll relative to the upper and additional mutual shift by an angle GET - © it + 180 °, a pulse is given by the sip-a to the key 28 and the transfer of the value of A Sai, corresponding to A Zamii s element 37 memory. At the same time, by means of the inversion elements 32, 33 matches, the prohibition of changing the parameter values stored in the memory elements 34-36 is imposed. The selection of the corresponding connections of the inputs of adders 39 and 40 and their transfer coefficients ensures that the output signals of the adders match the eccentricities of each of the rolls Av and An (realization of expression (3)). To find the angles of phase shift of the eccentricities of each of the rolls, adders 38 and 41 are provided, the output signals of which are proportional to p w and p n (realization of expression (4)).

The logic block 22 (FIG. 3) contains an adder 42, two comparison elements 43 and 44, three matching elements 45-47, a key 48, a multiplication element 49, a counter 50, two inversion elements 51 and 52, a delay element 53 and two elements 54 and 55 memories. The combined first inputs of the comparison elements 43 and 44 are the first input of the block, the combined second inputs of the comparison element 44 and the adder 42 are the sixth input of the block, the seventh input of the block is the first input of the adder 42, the third input of which is connected to the signal Ui80 °, the second input the block is the second input of the comparison element 43, the third input of which is connected to the output of the key 48, the first input of which is connected to the output of the adder 42. The fourth input of the block is the control input of the counter 50 associated with the control input of the memory element 54 , output which is the second output of the block. The fifth input of the block is the first input of the matching element 47, the second input of which, associated with the first input of the matching element 46, is the third input of the block. The first output of the block is the combined inputs of the delay element 53, the first input of the matching element 45, and the output of the memory element 55, the control input of which is connected to the output of the inversion element 51 connected to the output of the comparison element 43 and the third input of the matching element 47 , the output of which is associated with the input of the memory element 55. The output of the comparison element 44 is associated with the second input of the coincidence element 45, the third, whose bypass is associated with

a control input of the key 48, a second output of the counter 50, and an input of the inversion element 52, the output of which is associated with the second input of the matching element 46, and its third input with the output of the delay element 53.

The output of the match element 46 is associated with the counting input of the counter 50, the first output of which is associated with the first input of the multiplication element 49, the second input of which is associated with the signal UA #, and its output with the second input of the key 48.

The order of operation of logic block 22 is as follows.

At the beginning of the measurements, the logical signal 1 arriving at the fourth input of the block is set to the initial (zero) position of the memory element 54 and the counter 50, as a result, the key 40 provides communication with

the first input of the comparison element 43 is the output signal of the multiplication element 49. With equal current values of the angles of rotation of the upper and lower rolls, i.e. with equality © in and 0H at the output of the element 43

Comparison produces a logical signal G. The presence of logical signals G on the third and fifth inputs of the block, formed after the required compression of the rolls and the upper roll in the original

position, leads to the occurrence of signal 1 at the output of the element 47 coincidence, the inclusion of the element 55 of the memory and the appearance of the logical signal 1 at the first output of the block, allowing the start of the measurement of

DZE during the complete rotation of the upper roll, after which the coincidence element 46 generates a signal for recording a single pulse into the counter 50, and therefore the beginning of the second measurement is determined by the achievement of a phase shift between the current values 0V and 0H by D0 el. determined by the setting at the second input of multiplication element 49. After conducting a full measurement cycle (full rotation of the lower

a logical signal 1 appears at the second output of the second counter at the second output of the counter 50; connecting the key 48 to the first input of the comparison element 43 with the output of the adder 42, the output signal of which

proportional to the value of QBT - © nt + 180 °. When the current values of the angles 0 V and 0 C are reached, equal to the output signal of the adder 42, the comparison element 43 is triggered, and if 0 W and н nT are equal, the comparison element 44 is also activated, resulting in the memory element 54 that includes the appearance at the second output of the logical signal block 1, corresponding to the moment of the end of the measurement cycle.

Thus, the proposed device allows, prior to the start of rolling, by finding the maximum and minimum values of the rolling force and memorizing the corresponding angular position of the rolls, to determine the exact value of the eccentricity parameters of each of the rolls and conditions close to the workers, thus eliminating the need for cumbersome and complex mechanical measuring equipment, the measurement accuracy and efficiency is improved.

Especially effective is the use of the proposed device on reversing mills with individual electric rolls, when rolling relatively short strips.

Claims (3)

1. A device for compensating the eccentricity of a roll stand roll cage containing two pulse sensors and two speed sensors mechanically coupled to the rollers and connected to the corresponding counters, a regulator connected to the servo valve of the pressure cylinder of the pressure cylinder coupled to the position sensor, the output of which is connected to the first input of the regulator, the rolling force sensor connected to the inputs of the variable component extraction unit and the threshold element two keys, two sinusoidal signal generators, outputs The couplings are connected to the inputs of the adder, the output of which is connected to the second input of the regulator via the first key, characterized in that, in order to improve the quality of the band, it is equipped with a maximum extraction unit, a division element, a logic unit, a third key, the control input of the second key is connected with the output of the threshold element, and the output with the third input of the regulator, the input of the division element is connected to the output of the variable selection block, the first, second, and third gatherings of the logic block and the max selection block are pairwise connected the mind is connected to the outputs of the counters and the third key, respectively; the fourth input of the logic block is connected to the output of the first speed sensor and the input of the variable component extraction block, the fifth input — to the output of the threshold element, the sixth and seventh inputs — Spock and the second selection outputs, respectively the maximum, the output of the LS unit is connected to the control input of a variable component extraction unit, the second output is connected to the fourth input of the maximum allocation unit and the control input of the first key, the output of the div element neither is coupled to a fifth input of the maximum isolation block, the first and third outputs are connected to the first generator gatherings sinusoidal signals, and second and fourth - a second generator inputs. 2. A device according to claim 1, characterized in that the maximum allocation unit comprises four keys, a comparison element, two pulse elements, an inversion element, a coincidence element, four memory elements, four adders, the combined control inputs of the elements of the memory unit being the third input of the unit, the combined inputs of the first pulse element and the inversion element are the fourth block input, the combined inputs of the first and second keys and element the comparisons are connected to the fifth input of the block, the inputs of the third and fourth keys are respectively the first and second inputs of the block, the outputs of the adders are the corresponding outputs of the block, the combined control inputs of the second, third and fourth keys are connected to the output of the coincidence element, the first input of which is connected with the output of the inversion element, and the second input - with the output of the second the pulse element connected to the output of the comparison element, the output of the first pulse element is connected to the control input of the first key, the output of which is connected to the input of the first memory element connected by the output to the first inputs of the first and second adders, the outputs of the second, third and fourth keys are connected respectively, with the inputs of the second, third and fourth memory elements, the outputs of which are respectively connected to the first inputs of the second, third and fourth adders, the output of the third element is PA m is also connected to the first inputs of the second adder and the reference element, the second inputs of the third and fourth adders are connected to the output of the phase shift adjuster by 90 °. 3. The device according to claim 1, characterized in that the logic unit comprises an adder, two comparison elements, three coincidence elements, a key, a multiplication element, a counter, two inversion elements, a delay element, and two memory elements, the combined first inputs the comparison elements are the input of the block, the combined second input of the first comparison element and the first input of the adder is the sixth input of the block, the seventh input of the block is the second input of the adder, the third the input of which is connected to the phase offset by 180 °, and the input of the block is the second input of the second comparison element, the third input of which is connected to the key bypass, the first input of which is connected to the output of the adder, the third output of the block is the control input of the counter connected to the control input of the first memory element, the output of which is the second output of the block, the fifth input of the block, has left the first input of the first match element, the second input of which is connected to the first input of the second match element, The fourth block input, the first block output are the combined input of the delay element, the first input of the third match element, and the output of the second memory element, the control input of which is connected to the output of the first inversion element connected in parallel with the pyx of the second comparison element and the third input of the first coincidence element, the output of which is connected to the input of the second memory element, the output of the psglugo comparison element is connected to the input of the third coincidence element, the third input of which is connected to the control "stroke key, the first output of the counter and the input of the second inversion element, whose laser is connected to the second input of the second coincidence element, the third input of which is connected to the output of the delay element, the output of the second The joint element is connected to the counter input, the second output of which is connected to the first input of the multiplication element, the second input of which is connected to the output of the setter, and its output to the second input of the key. 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