SU1308411A1 - Apparatus for monitoring the filling of interstand space in multi-strand rolling - Google Patents

Abstract

The invention relates to rolling mill control devices. The purpose of the invention is to improve the quality of finished rolled products by increasing the accuracy of determining the number of billets rolled simultaneously in adjacent cages during multiline rolling. The essence of the invention lies in the fact that when the first billet is seized by the rollers of the previous stand, an abrupt increase in the signal occurs at the output of the unit 1 for analyzing the filling of the calnbers of this stand. This signal arrives at the input of the comparator 6, at the output of which a logical unit signal appears, which enters the input of the OR-NOT 7 element, from which the signal of the logical unit arrives at the input of the zero-setting of the reversible counter 8, which goes into sharp counting. When the billet is seized by the rolls 4 of the subsequent stand, the signal at the output of the roll gauge filling analysis analysis unit 2 increases abruptly. The signal from block 2 is fed to the input of the comparator 5 and the imaging unit 3 pulses. At output 5, a signal of a logical unit appears, which comes to the input of the element RSHI-HE 7, the output signal of which at the same time saves the value of logical zero. Subsequently, in the presence of at least one workpiece in the rolls, the output signal of the 11PI-HE element .7 is set to a logical zero, and the counter 8 operates in the counting mode. I il. a (L from 00 to 00

Description

113

The invention relates to control and regulating devices of rolling mills and can be used to automate multi-row varietal and wire mills, in particular when creating systems for controlling the tension of billets using information on the number of billets that are rolled simultaneously in adjacent cells of a multi-row mill stand.

The purpose of the invention is to improve the quality of finished rolled products by increasing the accuracy of determining the number of blanks rolled simultaneously. adjacent cages during multiline rolling.

. The drawing shows a block diagram of the device.

The device contains blocks 1 and 2 of the analysis of the filling of the gauges of the rolls, respectively, of the previous and subsequent along the rolling of the adjacent stands of the rolling stands of the continuous multi-run group. Each of blocks 1 and 2 of the analysis of the filling of roll gauge rolls of the rolling stand is made in the form of a rolling stand load analyzer. The rolling stand load analyzer is designed to receive a signal at its output, functionally, for example, directly proportional to the number of billets that are calibrated at the current time in the gauges of the rolls of the rolling stand and abruptly change during pickups and blowouts of the billets.

The rolling stand load analyzer contains a drive motor current sensor (not shown) connected by its output to a level level input (not shown), the output of which is the output of the stand load analyzer and the rolling stand gauge filling analysis unit, the number of levels is not equal to the number of streams in the rolling stand (threads in a continuous group of stands).

The values of I ,, 1, 1, and 1 of the current at the water electric motor, at which abrupt changes in the output signal of the roll gauge filling analysis unit of the rolling stand, are chosen to be equal to the minimum current values in the presence of. rolls stands the corresponding number of blanks. These current values are determined experimentally or by calculation.

Other options are possible for analyzers of loading rolling stands, for example, using electrostatic or static torque of electric motors or metal pressure sensors on rolls of the respective stands instead of current sensors, provided that rolling mill load analyzers will work exactly and not less reliably. than with the indicated variant of their implementation using current sensors of driving electric motors.

The outputs of blocks 1 and 2 of the analysis of filling the calibers of the rolls of adjacent stands are connected to the inputs of the first 3 and second, respectively, 4 pulse shapers, implemented, for example, as a differentiating link, as well as with the inputs of the first

5 and second 6 single threshold comparators. The first 3 and second 4 pulse shapers differ between themselves in that the first of them emits a pulse with an abrupt increase in the input signal, i.e. when the billet is seized by the rolls of the subsequent stand, and the second is pr: a stepwise decrease in its input signal, i.e. with the release of the workpiece from the rolls of the previous stand. The first 5 and second

6 single-threshold comparators form logic-signals at their outputs. if the signals at their inputs are different from zero, i.e. in the presence of at least one workpiece in the rolls, respectively, the next and previous stands. The thresholds for the comparators 5 and 6 are chosen to be somewhat smaller values of the output signals of the blocks 1 and 2, respectively, of the analysis of filling the gauges of the rolls of rolling stands if the rolls have these stands in exactly one workpiece.

The first 5 and second 6 single-threshold comparators are connected by their outputs respectively to the first and second inputs of an OR-NOT 7 logic element, the output of which is connected to the zero input input of a reversing counter 8. The output signal of the OR-NOT 7 logic element only has the value of a logical unit when the output signals of comparators 5 and 6 have the value of logical zero, i.e. in the absence of blanks in the rolls of both adjacent stands. Thus, a device circuit node containing the first 5 and second 6 one-threshold comparators and an OR-BE 7 logic element with their connections is intended to feed the zero signal of the reversing counter 8 of a logical unit signal in the absence of blanks in the rolls. adjacent stands in order to set the zero value of the signal Z at the output of the latter. This must be done after starting the mill before rolling the blanks.

The outputs of the first 3 and second 4 pulse formers are connected, respectively, with the inputs of the forward and reverse counts of the reversible counter 8. The latter is designed to sum the pulses fed to its forward counting input and subtract from this sum of pulses fed to its countdown input, provided that the signal at its input setting zero is a logical zero.

Since the appearance of a pulse at the input of the direct counting indicates that one of the threads in the interstand gap is filled with a blank, and the appearance of a pulse at the input of the counting count indicates that the blank of one of the threads is cleared, as a result of the direct and reverse counting operations (summing and subtracting pulses arriving at the inputs of the direct and reverse counting, respectively) at the output of the reversing counter 8, a signal Z is formed, which carries information about the number of blanks rolled simultaneously in the adjacent cells of this interlayer tevy about the interwave at the current time. The signal Z has a digital or analog form depending on the performance of the reversing counter 8. In the first case it will be, for example, a binary code, and in the second - a voltage proportional to the number N of blanks rolled simultaneously in adjacent cells.

The device works as follows.

The initial state is taken when rolling of blanks is not carried out in any of the adjacent stands of the interstand gap, equipped with the proposed device. The signals at the outputs of blocks 1 and 2 of the analysis of the filling of the caliber rolls, respectively, are

e jq

J5 20 25

zo

50

40

45

The subsequent stands are zero. At the same time, the signals at the outputs of the first 3 and second 4 pulse shapers, the first 5 and second 6 single threshold comparators are also equal to zero. The signal at the output of the logical element OR NOT 7 has the value of a logical unit. This signal is applied to the input of the zero-setting of the reversible counter 8, as a result of which the output of the last (| Z signal is zero), indicating that not a single thread in the space between the spaces is filled with the workpiece.

With the capture of the first billet by the rolls of the previous stand, a jump-like increase of the signal occurs at the output of the block I analysis of the filling of the roll gauges of this stand. This signal is fed to the input of the second one-threshold comparator 6, the output of which is a signal of a logical unit arriving at the second input of the logic element RSHI-HE 7, as a result of which the signal of the logical unit is removed from the output of the logic element affecting the zero setting input counter 8, and counter 8 goes into account mode.

The second driver 4 pulses to the increase of its input signal does not respond. When the billet is seized by the rolls of the subsequent stand, the signal at the output of the block 2 of the analysis of filling the gauges of the rolls of the next stand, which is fed to the inputs of the first single-threshold comparator 5 and the first shaper of 3 pulses, rushes up. At the output of the comparator 5, a signal unit of the logical unit appears, arriving at the first input of the OR-NOT 7 logic element, the output of which, while maintaining the value of the logical zero, Later, if there is at least one. blanks in the rolls of at least one of the adjacent stands, the output signal of the logical element OR NOT 7 has the value of logical zero, and the reversible counter 8 operates in the counting mode.

Intermittent surge-out. The second signal of the analysis of the filling of the calibers of the rolls of the next stand leads to the formation of a pulse at the output of the first driver of 3 pulses. This impulse arrives at the input of the forward count of the reversible counter 8, as a result of which 513

The output of the last Z signal increases and takes the value interpreted as

The capture of each next billet by the rolls of the previous stand is accompanied by an abrupt increase in the signal at the output of the block 1 for analyzing the filling of the gauges of the rolls of this stand, which does not change the condition of the former 4 pulses, comparator 6, element 7 and counter 8 of the device. The number N of blanks rolled simultaneously in the rolls of adjacent stands does not change either.

The capture of each next billet by the rolls of the subsequent stand leads to a jump-like increase in the signal at the output of the block 2 analysis of the gauge of the rolls of this stand, which does not change the state of the comparator 5 and the device element 7. And at the output of the first generator 3 pulses received at the input of the forward count of the reversible counter 8, as a result of which the signal at its output upon receipt of each of these pulses increments uZf, interpreted as an increase in the number N per unit. When ejecting the workpiece from the rolls of the previous one, the signal at the output of the block 1 for analyzing the filling of the calibers of the rolls of this stand decreases abruptly. The state of the comparator 5, the pulse former 3 and the device element 7 remain unchanged and the signal at the output of the logic element OR NOT 7 retains the value of logical zero, and at the output of the second pulse former 4 a pulse is formed, the input to the counting input reversible counter 8. The value of the output signal la 2 | the reversing counter 8 is reduced by the value of uZ, which indicates a decrease by one unit of the number N of blanks rolled simultaneously in adjacent cages. Similar processes occur in the device when each next billet is ejected from the rolls of the previous stand,

The ejection of blanks from the rolls of the next stand leads to an abrupt reduction of the signal at the output of the block-2 analysis of the filling of the calibers of the rolls of this stand ...

5 o 0

five

five

sixteen

the pulse 3 and counter 8 remain unchanged, if at least one workpiece is placed in the rolls of the previous or subsequent ripo stand, otherwise the logical unit signal appears at the output of the OR-NO 7 logic element, the zero value of the Z signal is set to output of the reversing counter 8 and the device enters the initial state considered above.

Thus, the device controls the filling of the interstand gap with blanks along all the threads and delivers the signal Z with the output of the reversible counter 8, exactly corresponding (in a digital code or in analog form) to the number N of blanks rolled simultaneously in adjacent cells of a given intercellular gap at the current time.

The signal from the output of the device can; used, for example, in the control systems of the tension of the workpieces in the interstand spaces to the continuous continuous groups of stands of the winding mills for the formation of control actions, for example, a predetermined interstage tension, depending on the number of workpieces rolling simultaneously in the adjacent cages.

The economic effect from the use of automatic systems using the proposed device consists mainly in improving the quality of finished products, reducing the output of substandard products,

Formula of gain

A device for controlling the interstand gap in multi-line rolling, containing blocks for analyzing the filling of roll gauges before and subsequent rolling of adjacent stands and the first pulse shaper, whose input is connected to the output of the block for analyzing filling roll gauges of the subsequent stand, characterized in that the quality of finished steel by increasing the accuracy of determining the number of billets rolled simultaneously in adjacent cages during multi-line rolling, it is supplied with watts A single pulse shaper, reversible counter.

the first and second one-threshold comparators and an OR-NOT logic element, the input of the second pulse generator connected to the output of the roller gauge filling analysis unit by the stand, the outputs of the first and second pulse forming machines are connected to the forward and reverse counting inputs of the reversible counter, respectively; P.Geershi Order 1662/11

Compiled by Y. Rybyev Tehred V. Kadar

Corrector

Circulation 481 Subscription

BHHIfflH USSR State Committee

for inventions and discoveries 113035 Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

84118

l of which is connected to the output of the logical element OR NOT, the outputs of the block for analyzing the filling of gauges of rolls of the subsequent and previous stands are also connected to the inputs of the first and second one-cost comparators, connected by their outputs respectively to the first and second inputs of the logical element fO OR-NO .

Proofreader M.Sharoti

Claims (1)

Claim A control device for filling the interstitial gap during multi-thread rolling, containing analysis units for filling the roll calibers of the previous and subsequent rolling stands and the first pulse shaper, the input of which is connected to the output of the analysis unit for filling the roll calibers of the subsequent stand, which is isolated I mean that, in order to improve the quality of finished products by increasing the accuracy of determining the number of billets rolled simultaneously in adjacent stands during multi-strand rolling, it is equipped with ring generator pulses, a reversible counter, Ί the first and second single-threshold comparators and the OR-HE logic element, the input of the second pulse shaper connected to the output of the analysis unit for filling the roll calibers of the previous stand, the outputs of the first and second pulse shapers connected respectively to the inputs of the forward and reverse counting of the reversible counter, the input of the setup is well For which it is connected to the output of the OR-HE logic element, the outputs of the analysis unit for filling the roll calibers with the next and previous stands 5 are also connected to the inputs of, respectively, the first and second one-threshold compartments of SROV, connected by their outputs, respectively, to the first and second inputs of the logic element 10 OR NOT.