SU1234072A1 - Flying shears control apparatus - Google Patents

Description

holder, the fourth input of the matching unit is connected to the first input of the counter, the output of which is connected to the first input of the second adder, the second input of which is connected to the register output, and the output is connected to the second output of the matching unit and connected to the second input of the first adder, the output of the node for determining the error of the specified and the used path of the scissors is connected to the first input of the second key, the second and third inputs of which are connected to the first input of the node for determining the error of the specified and waste scissors path and with the output of the delay element, the output of which is connected to the first input of the first adder, the input of the first register is connected to the output of the second key, the first input of which is connected to the output of the setpoint generator, and the second input - to the output of the OR element and the second input of the counter, the inputs element OR connected to the output of the delay element and the second input of the block, the first input of which is connected to the input of the delay element. 3. The device according to PP. 1 and 2, characterized in that the second correction block contains the first and second keys, a register, the first and second delay elements, the first and second setters of the code, the comparison node, the adder, the first input of the block connected to the first input of the first key, the second input of the block connected to the second input of the first key and the input of the first delay element, the output of the adder is connected to the output of the block, the output

one

The invention relates to the automation of rolling cutting units on section and billet mills and relates to the processing of metals by pressure.

The aim of the invention is to increase the accuracy of a rolled cut and reduce waste.

FIG. 1 is a block diagram of a flying scissors control device; in fig. 2 is a block diagram of a position matching block; in fig. 3 is a block diagram of a second correction unit; in fig. 4 is a block diagram of a third correction block.

The flying scissors control device 1 (Fig. 1) contains the first sensor 2 pulses, the cut sensor 3 and the tachogenerator 4 rigidly mounted on the shaft of the flying scissors, rigidly fixed on the shaft of the feed rollers 5 the second sensor 6 pulses, the photo sensor 7, the control unit 8, the first correction unit 9, position matching unit 10, key 11, speed setpoint 12, speed matching unit 13, second

the first key is connected to the input of the register, the first output of which is connected to the first input of the comparison node, and the second output to the first input of the second code master, the second output to the first input of the second code master, the second input of the comparison node is connected to the output of the first code master, output - with the first input of the second key, the second input of which is connected to the output of the first delay element, the output of the second key is connected to the input of the second delay element and the second input of the second unit code, the first and second inputs of the adder are connected to responsibly with the outputs of the second code master and the second delay element.

4. The device according to PP. 1-3, characterized in that the third correction unit contains the first and second keys, a code-voltage converter, a comparison node, a multiplication circuit, the first input of the block connected to the first input of the first key, and the second input of this block connected to the second input of the second key, the third block input is connected to the input of the multiplication circuit, the output of which is connected to the first input of the comparison node, the second input of which is connected to the fourth input of the block, the output of the comparison node is connected to the second input of the first key, the output of which is connected to the first input the second key, the output of which is connected to the input of the converter code - voltage, the output of which is connected to the output of the block.

block 14 correction, the third block 15 correction. In this case, the inputs 16-19 of the position matching unit 10 are connected respectively to the outputs of the cut sensor 3, the photo sensor 7, the pulse sensor 2, the key 11,

and the outputs 20 and 21 are connected respectively to the first input of the speed matching unit 13 and the input 22 of the second correction unit 14, the input 23 of which is connected to the cut sensor 3, and the output 24 is connected

with input 25 of the third correction block 15. The inputs 26, 27 and 28 of the third correction unit 15 are connected respectively to the outputs of the control unit 8, speed controller 12 and tachogenerator 4, and the output 29 of this block is connected to the second input of the speed matching unit 13. In this case, the third and fourth inputs of the speed matching unit 13 are connected respectively to the outputs of the speed setpoint 12 and the tachogenerator 4, and the output of the photosensor 7

connected also to the first inputs of the control unit 8 and the first correction unit 9, and

the output of the cut sensor 3 is also connected to the second inputs of the first correction unit 9 and the control unit 8, the output of the second pulse sensor 6 is connected to the third input of the first correction unit 9, the output of which is connected to the first input of the key 11, the second input of which is connected to the output of the control unit 8 and the output is with the speed master 12 input.

The position matching unit 10 (FIG. 2) contains a node 30 for determining the scattering, matching set and the used scissors path, code setting device 31, delay element 32, first key 33, element 34 OR, counter 35, first adder 36, second adder 37 , code converter 38 is voltage, position regulator 39, second key 40, register 41, the first input of the mismatch definition node 30 of the specified and used scissors path connected to the first input of the unit 31 of the code, the input of the delay element 32 and the first input of the second key 40 is input 16 yes The leg unit, the second input code setter 31 connected to the second input of the OR element 34, is input to the block 17. The second input of the node 30 for determining the mismatch of the specified and used scissors path is the input 18 of this unit, the input 19 of which is the first input of the counter 35, the second input of which is connected to the first input of the first key 33 and the output of the OR element 34. The output of the setting device 31 of the code is connected to the second input of the first key 33, the output of which is connected to the input of the register 41. The output of the delay element 32 is connected to the first input of the element 34 OR and to the second input of the second key 40, the third input of which is connected to the output of the node 30 determine the mismatch of the set and the waste path of the scissors, and the output is connected to the first input of the first adder 36, connected in series with the converter 38, the voltage code and the position regulator 39, the output of which is the output 20 of this block. The output of register 41 is connected to the first input of the second adder 37, the second input of which is connected to the output of the counter 35, and the output is connected to the second input of the first adder 36 and is the output 21 of this block.

The second correction block (Fig. 3) contains the first key 42, the first delay element 43, the register 44, the comparison node 45, the first code setpoint 46, the second code setpoint 47, the second key 48, the second delay element 49, the adder 50, and the block input connected to the first input of the first key, the second input of the block is connected to the second input of the first key and the input of the first delay element, the output of the adder is the output of the block, the output of the first key is connected to the input of the register, the first output of which is connected to the first input of the comparison node, and the second output - with the first entrance second setter of the code, the second input of the comparison node is connected to the output of the first setting unit of the code, and the output is connected to the first input of the second key, the second input of which is connected to the output of the first delay element, the output of the second key is connected to the input of the second delay element and the second input of the second setting unit, the first and second inputs of the adder are connected respectively to

0 outputs of the second master code and the second delay element.

The third correction block (Fig. 4) contains the first key 51, the second key 52, the code-voltage converter 53, the multiplication circuit 54, the comparison node 55, the first block input connected to the first input of the first key 51, and the second block input connected with the second input of the second key 52, the third input of the block is connected to the input of the multiplication circuit 54, the output of which is connected to

Q is the first input of the comparison node 55, the second input of which is the fourth input of the block, the output of the comparison node 55 is connected to the second input of the first key 51, the output of which is connected to the first input of the second key whose output is connected to the input

5, a code-voltage converter whose output is a block output.

The device works as follows. The input of the speed matching unit 13 receives signals from the speed adjuster 12, the position matching unit 10, the feedback signal from the tachogenerator 4 and the output of the correction unit 15, by means of which this unit coordinates the flying scissors speed. In normal operation, when the flying scissors comes out at a steady speed, the signal from the output 20 of the position matching unit 10 should be equal to zero, since at this moment the mismatch between the target position of the rolled and scissors should become

equal to zero. However, due to the time variation of the parameters of the analog part of the system (caused by heating or cooling of the engine or tachogenerator, drift of the parameters of the amplifiers) when

The steady-state speed at the output 20 of the position matching unit 10 will be some additional signal other than zero and determining the cut error. For example, if “the zero of the speed regulator of the speed matching unit 13, which has a proportional characteristic, has gone, then a zero signal at the output from it will correspond to a zero signal at the input to the speed regulator. Therefore, when the flying scissors reaches the steady-state speed, when the signal at the entrance to the speed controller should become close to zero, the speed of the flying scissors will change in this way until some additional signal is produced at the output 20 of the position matching unit 10, which differs from zero where the signal at the output of the speed controller becomes close to zero. This additional signal from the output 20 of the position matching unit 10 will be a signal proportional to the mismatch along the path between the scissors and the car, and by the time of the cut will determine the cut error of the next piece of bar.

Therefore, in the position matching unit 10, elements are introduced by which at the time of the cut, the cut error can be determined (it will be equal to the content of the adder 37 at the time of the cut).

Correction block 14 determines whether this error lies within acceptable limits. If so, the device does not respond. If it is out of acceptable limits, the correction unit 14 will, at its output after each cut, accumulate a number that, through the correction unit 15, at the time of the flying shears at a steady rate, will flow to the input of the speed matching unit 13 and thereby compensate the part of the additional signal from the output 20 of the block 10 is matched in position, reducing the mismatch between the specified positions of the car and the shears, i.e. reduce cut error. It should be noted that the full "compensation will not be made immediately after the first cut, but several, when the output 24 of the correction block 14" accumulates a number at which the additional signal from the output 20 of the block 10 matches the position, when the flying scissors on the steady speed is zero, i.e. there will be no mismatch between the specified positions of the scissors and rolled by the time of the cut and, therefore, the cut error will be equal to zero. If the cut error due to the above reasons again goes beyond the permissible limits, the second and third correction blocks automatically “enter it within the specified limits, making it less than acceptable.

The position matching unit 10 has a node 30 for determining the mismatch between the set and the spent shear position, to the input of which pulses are received from the first pulse sensor and which is controlled by the cut signal. In this block there is also a node for determining the discrepancy between the specified and the used rolled position, which consists of a code setpoint 31, which via the switch 33 controlled by the OR element 34 and the delay element 32 gives the input 41 of the setpoint code or the measured length or the length of the front end of the rolled product or the number of the initial position, of the counter 35, to the first input of which (through 0 block 9 correction and key 11) are received pulses from the sensor 6 of pulses. The counter is reset by

a cutting impulse passing through delay element 32 and element 34 OR at its second input. Thus, at the output of the counter 35 is a code equal to the current rental path. This code goes to the first input of the adder 37, to the other input of which the job code from register 41 arrives. This adder performs algebraic summation of these codes, and the error code of the specified and used rental path is obtained at its output. This code is fed to the second input of the adder 36, to the first input of which, via the key 40, a mismatch signal is received between the specified and the used position of the scissors. The presence of the key 40 is due to the fact that at the moment of cutting the code, equal to the task along the path of the scissors and coming from the node 30 to the input of the adder 36, does not introduce errors in the exact determination of the cut error value, i.e. by the cut pulse arriving at the second input of this key, it is closed, and by the cut impulse delayed by the delay element 32 and arriving at the third input of this key, it opens. The adder 36 performs algebraic summation of the codes arriving at its inputs, and

through a code-to-voltage converter 38 and a position controller 39, the error signal between the position of the rolled stock and scissors enters the output 20 of the unit.

On the output 21 of the block 10 approval

The position receives the mismatch code of the specified and used rental path, which is fed to the first input 22 of the correction unit 14 and which at the time of the cut represents a cut error. So, at the time of the cut, the key 42 is opened, and

error cut through the first input 22 of the correction block 14 is fed to the input of the register 44. From the first output of the register 44, a code equal to the error module is fed to the first input of the comparison node 45, and from the second output of the register 44 the code of the error sign goes to the second input of the unit 47 of the code . In comparison unit 45, the error module and the permissible error module are compared, the code of which comes from the output of the unit 46 of the code. If the current error is less than permissible, then the output of the comparison node 45 will be a inhibitory signal, which will not open the key 48. If the current error is greater than the permissible error, then the output of the comparison node 45 will be an enabling signal, the key 48 will open, and the cutting impulse delayed by the element 43 delays, at the output of the unit 47 of the Wits code, either positive or negative (depending on the sign of the current cut error) a number equal to one. Moreover, for the same cutting impulse delayed by the delay element 49, the coded number will be algebraically added to the previous contents by the adder 50, the initial state of which is zero. This process. The addition to the content of the adder 50, from the cut to the cut, will continue until the cut error modulo is less than acceptable.

The correction unit 15 introduces a signal proportional to the contents of the adder 50 to the input of the speed matching unit 13 when the flying scissors reaches a steady-state speed. In this case, the key 51, controlled by the signal from the output of the comparison node 55, will be opened if the signal from the output of the tachogenerator 4, which is proportional to the actual speed of the scissors, modulo becomes larger than the signal coming from the output of the multiplication circuit 54, proportional to the speed reference, taking into account a certain multiplication correction factor. Since this correction factor is chosen close, (but smaller) units, permission to open the key 51 will be given by the node 55 of the comparison when the actual speed of the scissors to the set value. The key 52 opens at the approach of the front end of the roll under the photo sensor 7 and closes when the scissors are reset to the initial position by a signal passing from the control unit 8. It should be noted that if the switch 51 or the switch 52 is closed, then at the output of the converter 53 there is a code-voltage — a zero signal.

When the front end of the rollout approaches, the key II opens under the photo sensor 7 by a signal from this photo sensor and the pulses from sensor 6 and 5

pulses through correction block 9, which corrects the price of the pulse caused by the change in the rolling diameter of the feed rollers, are fed to the inputs of blog 10, matching in position and speed adjuster 12. At the same time, the length of the front end of the roll is entered at the input of the register 41, the scissors begin to work out the cutting mode of the front end of the roll, and the key 51 of the third correction block 15 opens at the exit to the established speed, and the output from the output 29 of this block goes to the fourth input of the matching block 13 in terms of speed, which compensates for the additional signal from the output 20 of the position matching unit 10. At the time of the cut, it is determined whether the cut error is more acceptable or not. If more, then one is added or subtracted to the contents of adder 50, depending on the sign of the error. At the same time, a dimensional length code is fed to the input of register 41, and the scissors begin to work out the cutting mode of the dimensional lengths. The process described is repeated.

When the rear end of the rental passes the photo sensor 7, the keys 11 and 52 will close on the cutting impulse. In the register 41 the code of the initial position number will be entered, and the scissors will switch to the initial position testing mode.

This device allows to increase the accuracy of cutting the pieces of roll through the automatic correction of the error that occurs in the steady state at the output of the block matching position.

0

five

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I 21

eleven/

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Compiled by A. Sergeev

Editor M. BanduraTechred I. VeresKorrektor M. Pojo

Order 2682/13 Circulation 1001Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

2B

2728

29 fig-

Claims (4)

1. DEVICE FOR MANAGING VARIABLE SCISSORS, comprising a photo sensor installed up to the cutting line, a cut sensor, a first pulse sensor and a tachogenerator rigidly coupled to the shaft of the flying scissors, a second pulse sensor rigidly coupled to the shaft of the feed rollers, a control unit, a first correction unit, a key , a speed adjuster, a matching unit according to the position, a matching unit for speed, the first, second and third inputs of the matching unit for speed are connected respectively to the output of the speed setting unit, the first output of the matching unit position and the output of the tachogenerator, the output of the photosensor is connected to the first inputs of the control unit, the first correction unit and the input of the position matching unit, the output of the cut sensor is connected to the second inputs of the first correction unit and the control unit, as well as to the other input of the position matching unit , the output of the first pulse sensor is connected to the third input of the position matching unit, the output of the second pulse sensor is connected to the third input of the first correction unit, the output of which is connected to the first input of the key, the second input of which is connected to the output of the control unit, and the output - with the fourth input of the matching unit for the position and input of the speed adjuster, characterized in that, in order to increase the accuracy of the cut of the rental and reduce waste, an additional second and third correction blocks are introduced, the first input of the second correction unit is coupled to a first output of _a position alignment, and the second input - to the output of the sensor cut, the first correction block third input coupled to an output of the second correction unit, the second input - to the output node is governed iya, the third - with the output of the speed controller, the fourth input - with the output of the tachogenerator, and the output - with the fourth input of the speed matching unit. 2. The device according to π. 1, characterized in that the position matching unit, comprising a node for determining the mismatch between the set and the worked out path of the scissors, a code adjuster, a first adder connected in series with the code-voltage converter and a position controller, the output of which is connected to the first output of this unit, the first input of the node determining the mismatch between the set and the worked out path of the scissors, connected to the first input of the code setter, connected to the first input of this unit, the second input of the code setter is connected to the second data input of the second block, the second input of the node for determining the mismatch between the set and the worked out path of the scissors is connected to the third input of this block, additionally contains a counter, register, second adder, first and second keys, an OR element, a delay element, and the fourth input of the position matching block is connected to the first input of the counter, the output of which is connected to the first input of the second adder, the second input of which is connected to the output of the register, and the output is connected to the second output of the position matching unit and connected to the second input of the first of the adder, the output of the node for determining the mismatch of the set and worked out path of the scissors is connected to the first input of the second key, the second and third inputs of which are connected to the first input of the unit for determining the mismatch of the set and worked out way of scissors and with the output of the delay element, the output of which is connected to the first input of the first adder , the input of the first register is connected to the output of the second key, the first input of which is connected to the output of the code generator, and the second input to the output of the OR element and the second counter input, the inputs of the element OR connected to the output of the delay element and the second input of the block, the first input of which is connected to the input of the delay element. 3. The device according to paragraphs. 1 and 2, characterized in that the second correction unit contains the first and second keys, the register, the first and second delay elements, the first and second code adjusters, the comparison node, the adder, the first input of the block connected to the first input of the first key, the second input of the block connected to the second input of the first key and the input of the first delay element, the output of the adder is connected to the output of the unit, the output of the first key is connected to the input of the register, the first output of which is connected to the first input of the comparison node, and the second output is connected to the first input of the second master to ode, the second output is with the first input of the second code master, the second input of the comparison node is connected to the output of the first code master, and the output is with the first input of the second key, the second input of which is connected to the output of the first delay element, the output of the second key is connected to the input of the second element delay and the second input of the second code generator, the first and second inputs of the adder are connected respectively to the outputs of the second code generator and the second delay element. 4. The device according to paragraphs. 1-3, characterized in that the third correction unit contains the first and second keys, a code-voltage converter, a comparison node, a multiplication circuit, the first input of the block connected to the first input of the first key, and the second input of this block connected to the second input of the second key , the third input of the block is connected to the input of the multiplication circuit, the output of which is connected to the first input of the comparison node, the second input of which is connected to the fourth input of the block, the output of the comparison node is connected to the second input of the first key, the output of which is connected to the first input the second key, the output of which is connected to the input of the code converter, is the voltage whose output is connected to the output of the unit.