SU927422A1 - Apparatus for controlling measure cutting of rolled stock - Google Patents

Description

(5+) DEVICE OF CONTROL OF MEASURED RESIST .. RENT

one

The invention relates to the processing of MefannoB pressure and can be used to control the drives of the mechanisms for cutting machine tools and aggregates with dimensional cutting of rolled products on the go.

A device is known for controlling a measured rolling mill on the go, comprising a unit for measuring length, a digital-analogue position controller, a sinusoidal control unit and a length limiter 11;

The disadvantage of the device that implements the sinusoidal skok. The increase in volatility of the scissors in the intervals between cuts is, as shown by the results of digital modeling, the appearance of a dynamic error before a cut in working out a given length mismatch and current jolts. This is explained by the inertia of the speed contour and delay in working out the variable sinusoidal the driver signal of the speed coming from the output of the position controller, since in the second half of the cycle of testing the specified length error the formation of a sinusoidal velocity diagram and with the known device is carried out by the position controller

The purpose of the invention is to improve the accuracy of operation of the device for controlling rolled cuts on the go.

ten

Claims (1)

To achieve this goal, the on-the-go measurer control unit containing the unit for length control, a digital-analogue position controller, a sinusoidal control unit and a length limiter are equipped with a signal selector, the first input and output of which are electrically connected, respectively, to the output and to the input digital-analog position control, and the second and third inputs - with the outputs of the sinusoidal control unit, while the input of the sinusoidal control unit is electrically connected to the output of the control unit ika dimensional lengths. FIG. 1 shows a functional diagram of the control unit for the measured rolling cut on the go; 2, tachograms illustrating the principle of operation of the device. The drive 1 of the flying scissors 2 is controlled by a digital-analogue position regulator 3, which (is eleutrically connected to a unit of 4-dimensional lengths and a sinusoidal control unit 5, the regulator 3 consists of a reversing estimator 6, a digital-analogue converter 7 of a parolemic converter 8, a regulator 9 of speed and sy - a transducer 10, containing the current regulator of drive 1, as well as sensors 11-1 + feedback, respectively, on speed and position of scissors 2, on speed and movement of rolled 15 cut cutter 16, Block 5 sinusoidal control consists of reversible counters 17-19, digital-to-analog converters 20-22, a series-connected adder 23, a divider, 2k, and a quad 25, which is connected by its output to the analog input of digital-to-analog converters 21 and 22, whose digital input is connected to the output of the reverse counters, respectively 18 and 19, as well as RS-flip-flops 2b-28, zero of orgauov 29 and 30, coincidence circuit 31, discriminator 32 numbers, reference voltage source 33. The unit for measuring k lengths is electrically ;, connected to a length limiter 3t, two outputs of which are electrically connected to the sinusoidal control unit 5. The D / A position controller 3 and the sinusoidal control unit 5 are electrically connected to the signal selector 35. The output of the digital-to-analog converter 21 is connected to the analog input of the digital-to-analog converter 7 and corrects the input signal of the speed controller 9j supplied from the parabolic converter B. The output of the digital-analog converter 22 under the switches to the second input of the power converter 10, which is the second input of the current controller of the drive 1, The counting inputs of the If-19 counter are connected to the sensors 12 and i of the movement of scissors 2 and rolled 15, which determine the inputs of the counters 17 and 19 are connected respectively to the first and second 92 4 outputs of the The shortener is 3 lengths, and the control inputs of these counters are connected to the cut sensor 16, to which the reset input of the counter 18 is also connected. To the counting inputs of the counters 17-19, the output of the trigger 26 is connected to the reset input of the trigger 28, and the output of the trigger 27 is connected to the control input of the selector 35 of the signals ,, The setting inputs of the selector 35 of the signals are connected to the outputs of the counters 17, respectively, 5 and 6 of the regulator 3. The output of the selector 35 of the signals is connected to the digital input of the D / A converter 7 of the regulator 3. To the S-input, the trigger 26 is connected according to the scheme And the outputs of the null organ 29 and the discriminator 32 numbers. The output of the latter is also connected via oteMe And with a cut sensor 16 to the S-input of the trigger 27, the R-input of which, together with the R-input of the trigger 26, are connected to the output of the coincidence circuit 31. S-and R-inputs of the trigger 28 are connected respectively to the output of the zero-body 30 and to the sensor 16 of the cut. The inputs of the zero-organs 29 and 30 are connected respectively to the output of the counter 13 and the counter 6, to which the first input of the coincidence circuit 31 is also connected. The second input of the latter is connected to the second output limit l 3 lengths. The first and second inputs of the discriminator 32 numbers are connected respectively to the unit for measuring lengths and to the first output of the limiter 3 lengths, to which the digital input of the analog-to-digital converter 20 is also connected. The output of the latter together with the source 33 of the reference voltage is connected respectively to the first and second inputs of the adder 23. The input of the divisible divider 2k is connected to the rental speed sensor 13 15. The latter, together with the movement sensor 1 of the rental 15, are mechanically connected to (3 metering rollers. Fig. 2 shows tachograms}, 37-39 1. rivoda which correspond to dimensional cutting off lengths L -, wherein L C I ,, - cutting point). The operation of the device is as follows. At the time of the end of the cut (point a in the tachograms of Fig. 2), a preset length error is entered into the reversing counter 6 of the digital-analogue positioner 3 from the setpoint gauge 16 from the sensor of the cut sensor 16. - U-IH, (1) where U is the measured length of rolled 15; Its is the perimeter of the trajectory of the knives in the cutting cycle. The processing of a given mismatch uU - (1) is performed by a digital-analogue position regulator 3, acting on the actuator 1 with. Using sensors And and 13 feedbacks on displacement .6 and speed V rolled 15 and 12, 11 according to the position η and velocity Mc scissors 2 o The sinusoidal control unit 5 performs a correction of the output signal of the digital-to-analog converter 7 and, respectively, the driver | | of the speed controller 9 on the side of the controller of the scissors 2, and at the same time forms the driving signal of the drive 1 at the input of the power converter The driver 10 thus, the current (acceleration) of the drive 1 and the speed of the shears 2 of the scissors 2 vary as a function of the current current smoothing length, according to the expressions VI dB -de-CL, -d (d) (3) VH V The latter are identical to the sinusoidal functions, respectively, tf -A-cos Уц V - В-sin И describe sinusoidal graphs of current and speed of drive 1 of flying scissors 2 (Fig. 2). . In expressions (2) - (5), where -K, .K are constant; L & L + | Lu L Q - sections of respectively dimensional (LENGTH L and trajectory of scissors TC, on which the misalignment is carried out - length db (specified by the source of the reference voltage 33, and Lri - is formed by summator 23J, AK) | Г 1- Г Г А А L. “.- amplitude of the graphs of current and speed of drive 1. 2 To ensure that when cutting the measured lengths L exceeding the limit, the overload and heating of drive 1 do not increase, the corresponding tachograms 39 (Fig. 2) ) should be similar to the boundary tachogram 38, and their accelerating branches 5 -g are shifted by the period of the drive station 1, E-b. Both tachograms 38 and 39 are provided as a result of the length limiter 3. The signal of its first output is proportional to the number dL such that. | and L 1.75bh1 + LH 1 d Ldb, if dH 0.88 bw, if L 1, LH Values L 1.75bn1c and db 0.88Cl correspond to the boundary tachogram 38 (see Fig. 2). Thus, at the first output of limiter 3, the output signal of the setpoint generator k dimensional lengths AL (1) is repeated, until the measured length L reaches the boundary value, but then remains constant and equal to the boundary value dB, as long as the dimensional length exceeds the boundary length. The signal at the second output of the limiting system is always half the signal at its first output. The control of the excess by the measured length of the boundary value is carried out by the discriminator of 32 numbers, comparing the signal of the setpoint meter of length D and limiter 3 of length d1. If DLL then a signal appears at the output of the discriminator 32, which gives permission for switching on cut 16 of trigger 27 on a pickup signal and, accordingly, connecting a selector 33 to a digital-to-analogue converter 7 for the output of a reversible counter 17. If same db,. those. the measuring plate does not exceed the boundary, the output of the discriminator 32 does not have a signal, the trigger 27 is not turned on, and the selector 35 connects a reversible counter 6 to the digital-to-analog converter 7 Receiving sensor 16 (point c (tachograms 37-39, fig. 2) to reversible counters 6, 17 and 19, the numbers Db, Db, respectively, are entered. Using sensors 1 t and 12 of the movement of rolled 15 and the position of the scissors 2, counters 6, 17-19 form at their outputs in the first half of the cycle (section1 / -СЛ1 / О О II tV- l-, J l jr -1Ы W. CI d -5 tachograms, Fig. 2) signals corresponding to uL L e, d d t, D., - - D L On plots 0: - b tachograms 37-39 (see, Fig. 21 the current length mismatch & t tomflecTBeHHo l, U tachograms 37 and 38 for which the lengths does not exceed the boundary, this identity remains with all sections of the tachogram 39, with dimensional lengths exceeding the boundary, in section 5 — the current value of the gauge remains unchanged, since at point S of the zero-body 29 a trigger is triggered 26, which prohibits the counter from counting the signals of the sensors 12-14. At point 5, the value of g becomes equal to the mismatch reduced by the number (AL -,) i. corresponds to the value of l And with the boundary length- (tachogram 38). At point b, triggers 26 and 27 are reset by the coincidence circuit signal 31, since the number at the output of counter 6 becomes equal to the limiting value dB (2 at the second output of the length limiter 34). At the same time, the signal from the inverted output of the trigger 2b again reads the counters 17-19 of the sensor signals 12 and 14 and the current negotiation AE, and when the signal at the output of the trigger 27 disappears, the selector 35 connects to the digital-to-analog converter 7 instead of the counter 17 of the counter 6, which controls Reflection of a given mismatch of length lh. Due to this, the required accuracy of cutting the measured lengths L of rolled 15 is provided. Triggers 2b and 27 are included only at lengths exceeding the boundary length and are intended to ensure similar tachograms 38 and 39 (see Fig. 2). The values (& L - D. Or e) generated at the output of the counters, respectively 6 and 17, are a digital factor of the algorithm (3) (the latter is used as approximate lengths exceeding the boundary in the a-b-b tachogram 39, FIG. 2 in the section B of the tachogram 39, these quantities are equal to each other 1 "The remaining multipliers of the algorithm (3) are formed by a counter 18 / K (fs)., By series-connected digital-analog converters 20, adder 23, divisor 24 and quadrant 25. Multiplication of digital D and rV D analog K (values are produced by Ts. With digital channel 21 and the analog output of the latter is .9 2 multiplied by a digital value (AL-D) or (D.) a digital-to-analog converter 7. Root extraction from the result obtained by the software (3) is produced by a parabolic converter 8. dB The digital value is D. Formed at the output of counter 19, is a digital factor of the algorithm (2), the analog factor of which K, (-) is formed by those of algorithm (3), successively connected by links 20, 23-25. The multiplication of the factors according to the algorithm (2) is carried out by a digital-to-analog converter 22, the output of which is the master value of the current regulator of the drive 1. At the same time, the control with the help of the specifying sinusoidal signals according to the algorithms (2) and (3) power converter 10 and speed controller 3 achieve a reduction in the dynamic error in working out a given mismatch of length db (1) and the elimination of current jolts when scissors 2 exit before cutting to a steady speed V, since this eliminates the effect of the inertia of the speed loop of the drive 1. At the points B of the tachogram, fig 2, i.e. after completing a test of the specified error of length db (1), the output of the digital-to-analog converter 22 must be removed dynamic current (2) of drive 1. The signal (2) is cleared by counter 19 with a trigger 28, which is triggered by the zero-body 30 at zero output of counter 6, i.e. at points 6 of the tachograms 37-39, FIG. 2 "In this case, the scissors 2 come out at a steady speed V, synchronous with the rolling speed 15. After cutting (points d of the diagrams 37-39) trigger 28 is reset by the cut sensor 16 and the cycle repeats. Thus, by adding a signal selector to the device, as well as new electrical connections between it, a digital-analogue position controller, a sinusoidal control unit and a unit for measuring lengths, the dynamic error in the processing of the length error is eliminated, which increases the accuracy of work. Claims of the Control Device for Measuring Measuring Rollers on the Move, Containing a Measuring Length Controller, a Digital-Analog Positional Controller, a Sine-Wave Control Unit, and a Length Limiter, characterized in that, in order to improve the accuracy of operation 2, it is equipped with a signal selector, the first input and output of which are electrically connected, respectively, with the output and with the input of the digital-to-analog position controller, and the second and third inputs - with the outputs of the sinusoidal control unit, while the input of the sinusoidal control unit nor is it electrically connected to the output of the unit for measuring lengths. Sources of information taken into account in the examination of P. Application No. 2613088/27 Cl. B 23 D 25/16, 03.05.78. 2