SU1736652A1 - Apparatus for tracking welded seam coordinate in endless rolling mill - Google Patents

Abstract

The invention relates to metallurgy and can be used in rolling equipment control systems. The purpose of the invention is to improve the reliability of weld registration with respect to the first stand of the rolling mill while simultaneously increasing the accuracy of tracking the coordinate of the device. The device contains a setpoint constant, a strip margin, two pulse count counts, control unit of the weld joint distance from the butt-welding machine, sensor for registering the reserve of a strip in a loopback device, two pulse sensors, data on the shafts of the tensioning devices before and after the loopback device, the control unit of the butt-welding machine, the strip direction direction detection circuit, two pulse counters, an adder, a comparator unit, a trigger, three elements I. the counters of the seam relative to the butt-welding machine and relative to the first mill stand, and also an indicator board, connected accordingly. Improving the reliability and accuracy of recording the coordinates of the weld relative to the first mill stand is ensured by registering the stock of the strip not directly at the time of the end of welding, when the readings of the strip stock sensor do not correspond to the actual value of the stock, but when the weld passes the control point behind the butt welding machine. the sagging of the strip that occurs during welding between the tensioning device at the inlet of the loopback device and its trolley 2 Il. 10 S h CJ CN Oh

Description

The invention relates to metallurgy and can be used in rolling equipment control systems.

A device for tracking the coordinate of a weld in an endless rolling mill is known, comprising a weld presence sensor for detecting the occurrence of a weld at the mill entrance and a pulse sensor for tracking its movement to the first stand.

This device allows you to monitor the coordinate of the weld in an endless rolling mill; however, it is not reliable enough, since a sensor based on the anisotropy analysis of metal properties can be taken as a weld and

other strip defects that are not welded.

A device is known for tracking the coordinate of a weld in an endless rolling mill directly from the butt welding machine - the place of origin of the weld, which ensures the reliability of its registration. This device contains impulse sensors associated with measuring rollers installed behind the butt welding machine and at the mill entrance, a strip stock detection unit, a weld coordinate counter relative to the butt welding machine.

However, this device does not take into account the possibility of reversing the strip relative to the butt-welding machine, which does not provide the necessary reliability and accuracy of tracking the coordinates of the weld.

The closest to the invention is a device for tracking the coordinate of a weld on an infinite rolling bed, which contains a pulse sensor connected at its entrance with a tensioner roller located behind a butt welding machine, a strip moving direction circuit, a sampler gauge, a pulse counter, a weld coordinate counter with respect to the butt-welding machine, the control device of the said machine and two elements AND, the input of the installation of the reference setting of the pulse counter is connected to the output of the setpoint generator, the pulse counting course is connected to the output of the pulse sensor, the output is connected to the first inputs of each element And and to the C input of the zero setting of the pulse counter, the Forward and Back outputs of the movement direction circuit are connected to the second inputs of the I elements, the outputs of which are connected to the counting pulse inputs of the counter of the joint coordinate with respect to the butt welding machine, and the output of the butt welding machine control device is connected to the inputs R of the said counters. This device allows to take into account the reverse of the strip relative to the butt-welding machine.

The disadvantage of it is that it does not provide reliable registration of the weld with respect to the first mill stand while simultaneously ensuring the accuracy of tracking the coordinate of the weld,

The purpose of the invention is to increase the reliability of the registration of the weld with respect to the first mill stand while simultaneously increasing the accuracy of tracking the weld coordinate.

The goal is achieved by the fact that the known device for tracking the coordinate of the weld in an endless rolling mill, contains a pulse sensor,

on the inlet, connected to the tensioner pulley, located behind the butt-welding machine, a strip travel direction diagram, setpoint sampler, pulse counter, seam coordinate counter

0 with respect to the butt-welding machine, the control device of the said machine and two elements AND, the input of the setting reference of the pulse counter being connected to the output of the setpoint generator, the input of the counting

5 pulses are connected to the output of the pulse sensor, the output is connected to the first inputs of each E and E and to the C input of the zero meter of the pulse counter, the Forward and Back outputs of the travel direction circuit are connected to the second inputs of the I elements, the outputs of which are connected to the coordinates of the counter the seam relative to the butt welding machine, and the output of the control

The 5 butt-welding machine is connected to the inlets R of the above-mentioned meters, additionally equipped with a sensor for detecting the reserve of a strip in a loopback device connected to the loop of a loopback trolley.

0 device, a pulse sensor connected to a tensioning device roller located in front of the first stand, a strip reserve reserve constantizer, a pulse count pulse count on the entrance of the mill, a control distance adjuster for a welding machine, an adder, a pulse counter , by the comparison block, by the trigger, by the AND element, by the counter, the coordinates of the seam with respect to

0 of the first stand and the indication board, the first input of the adder is connected to the output of the setting unit of the band reserve constant, the second input is connected to the output of the sensor registering the band reserve in the loopback device, and

5 the output is connected to the input of the seam coordinate relative to the first stand, the counting input of the pulse counter is connected to the output of the pulse sensor, the input is connected to the output of the unit, count counts of pulses at the mill input, the input R is connected to the device start signal, and the input C is output the pulse counter and the first input of the element I, the second input of which is connected to the output Q of the trigger, and the output 5 with the counting input of the counter coordinate of the seam relative to the first stand, the first input of the comparator unit is connected to the setpoint control About the seam behind the butt welding machine, the second input is with the counter output of the seam coordinate relative to the welding machine, and the output is connected to the S input of the trigger and the C input of the seam coordinate relative to the first stand, the output D of which is connected to the indicator board and to the mill speed control device, and the zero output is connected to the input R of the trigger and connected to the device for tracking the seam in the cells.

Figure 1 presents the structural diagram of the proposed device; Fig. 2 is a time chart of the change in the margin of the strip and the position of the weld coordinate relative to the butt welding machine.

The tracking device for the weld 1 in the endless rolling mill (Fig. 1) contains a sensor 2 pulses connected at the input to a roller of a sliding device 3 located behind the butt welding machine 4, a circuit 5 for moving the strip 6, a setpoint generator 7, the pulse counter 8, the counter 9, the coordinates of the seam 1 relative to the butt-welding machine 4, the control device 10 mentioned by the machine 4 and the elements 11 and 12, the input of the setting of the reference value of the counter of 8 pulses connected to the output of the setpoint generator 7, the pulse counting input connected to the output of the sensor 2 pulses, the output connected to the first inputs of each of the elements 11 and 11 with the input C of setting the zero of the counter 8 pulses, the Forward and Back outputs of the directional circuit 5 are connected to the second inputs of the Elements 11 and 12, the outputs of which are connected to the inputs counting the pulses of the counter 9, the joint coordinates relative to the butt-welding machine 4, and the output of the device 10 of the control of the butt-welding machine 4 is connected to the inputs R of the counters 8 and 9, the device is additionally equipped with a sensor 13 for registering the reserve strip in the loopback 14, at the input connected to the winch 15 of the trolley 16 of the loopback device 14, with the pulse sensor 17, at the input connected with the roller of the tensioning device 18, located in front of the first cage 19, with the setting unit 20 of the band reserve constant, with the setting device 21 pulse count discretes at the mill entrance, the setting unit 22 of the control distance of the seam 1 behind the butt-welding machine 4, the adder 23, the pulse counter 24, the comparison unit 25, the trigger 26, the AND element 27, the counter 28, the coordinates of the seam 1 relative to the first stand 19 and the display board 29, the first input summat ora 23 is connected to the output of the setting unit 20 of the constant reserve of the strip, the second input - with the output of the sensor 13 of the registration of the stock

strip in the loopback device 14, and the output is connected to the input D of the counter 28, the coordinates of the seam 1 relative to the first stand 19. The counting input of the counter 24 pulses is connected to the output of the sensor 17 pulses, the input D is connected to the output of the setpoint 21 pulses counting at the mill input input R is connected to the device startup signal, input C is connected to the output of the counter 24 and 0 pulses and the first input of the element 27 And, the second input of which is connected to the output Q of the trigger 26, and the output to the counting input of the counter 28 cage 19, first entrance block 25 is compared with the setting unit 22 of the control distance of the seam 1 behind the butt welding machine 4, the second input is connected to the output of the counter 9, the coordinates of the seam 1 relative to the butt welding machine 4, and the output is connected to

0 by input S of trigger 26 and input C of counter 28 of weld 1 relative to first stand 19, output D of which is connected to indicator board 29 and to mill speed control device, and

5, the zero output is connected to the input R of trigger 26 and is connected to a seam tracking device in the cells. As sensors 2 and 17, pulse sensors of the type PDF-1M can be used.

0

As the sensor 13 registration of the reserve strip can be used code sensor type D-41. As a board 29, an indicator board of the type TEL-1U4 can be used. As setters 7, 20, 21, 22 can be used, for example. setters of typePMP-102. The strip driving direction circuit 5 and the butt-welding machine control device 10 may

0 be performed similarly known. Counters 8,9,24,28 can be implemented on chips K155IE7. Elements 11, 12 and 27 And can be performed on the chip K155LAZ. Adder 23 can be implemented on a K155IMZ microcircuit. Block 25 can be implemented on the chip K555SP1. The trigger 26 may be performed on the chip K155TM2.

The device for tracking the coordinate of the weld in an endless rolling mill operates as follows. After the end of the coil welding, the position of the welded joint is recorded during the process of moving the strip to the loop device.

5 of the seam relative to the butt welding machine, when the seam reaches a predetermined distance from the butt welding machine, the margin of the loop in the loop device is measured and the coordinate value of the seam along the strip relative to the first stand is formed.

rolling measure the length of the strip at the mill entrance, determine the value of the weld coordinate relative to the first stand with simultaneous output to the scoreboard and to the mill speed control device, and when the weld goes into the first stand, a signal about the first stand. In this case, the essential point is to record the value of the stock of the strip not at the time of the end of welding, e after moving the strip with a seam at a certain distance from the butt-welding machine.

To start tracking the seam coordinate with respect to the first one, it is necessary to know the margin of the loop in the loopback device, recorded by the code sensor, whose readings are proportional to the position of the loop loop trolley, the accuracy of recording the coordinate of the seam at the initial time and, consequently, the accuracy tracking the seam relative to the first stand.

However, the position of the cart does not always correspond to the actual stock of the strip from the butt-welding machine to the first stand.

During the joint operation of the head part with the mill, the strip located in the loopback device is located in the uncoiler, tensioning devices and winch of the loopback device carriage. The movement of the strip in the direction of the mill is due to the difference in tension on the said devices. Before the start of welding, the strip leaves the unwinder and, in order for it not to go into the loop device, reduce the tension on the trolley of the loop device, as a result of which the difference in tension along the strip increases, the trolley moves towards reducing the margin of the strip. A slack band is formed at the inlet of the loopback device and a trolley. The tension setting for the trolley is increased only after the end of the strip welding, and due to the inertia of the trolley it moves in the direction of increasing the margin of the strip more slowly than the strip enters the loopback device, therefore the strip stock sensor at the end of welding is proportional to the position loops of the loopback device are underestimated in comparison with the actual margin of the strip, which leads to a tracking error for the seam coordinate.

Therefore, it is necessary to register the strip margin not at the time of the end of welding, but after the seam passes a predetermined distance, when the seam sensor readings correspond to the actual strip margin in the loopback device.

At the moment of the end of welding (Fig. 2a), the actual reserve of the strip in the looper device, ee °, is greater than the value 3ap recorded by the sensor. After setting the required tension, the cart of the loopback device moves in the direction of increasing the margin, the sag of the band is eliminated and, starting from the moment the sensor is shown, coincides with the actual margin of the band. At the time, the seam is removed from the butt welding machine for a distance of 1 cm, w. which can be used as a given value 1 cm, w (about 10 m).

The value of the seam coordinate to the first stand at the moment is determined from the following relationship:

1sh, K1

1zap ° + K

zap

(one)

D

where zap. the value of the strip margin in the loopback device, recorded by the sensor 13 and depending on the position of the loopback carriage, m;

The const constant is defined as follows:

Kzapn.- K - 1cm. Sh, (2)

food K is a constant representing the unchanged part of the length of the strip from the butt welding machine to the first stand and defined by the design features of the head part of the endless rolling mill, m.

When each signal arrives at the counting input of block 28, its content changes as follows:

1sh. K1T 1sh, K1P-D (3)

where 1sh.mT IIU.KI is the value of the coordinate of the seam relative to the first stand at the current and previous times between two adjacent signals arriving at the counting input of the block 28. m;

D | - the length of the strip that passed at the mill input between two adjacent signals on the counting inputs of block 28 (A 1m),

The value of N, placed in blocks 7 and 21 and representing the number of pulses coming from sensors 2 and 17 when the strip moves by D 1 m, is determined by the following formula:

where No is the number of pulses per 1 revolution of the measuring roller;

Dp is the diameter of the measuring roller, mm; at No 150 and Dp 1000 mm N 48.

The device works as follows.

When starting the tracking device for the weld coordinate at the endless rolling mill, a signal is received at the input R of unit 24, according to which it is prepared for operation.

At the end of welding at time 1, the inputs R of counters 8 and 9 from the output of block 10 receive a signal, as a result of which both counters are prepared for operation.

When the strip moves in the head part of the mill from the output of sensor 2 to the counting input of counter 8, signals will be received. After the strip has traveled a discrete distance, the output of counter 8 shows a signal that goes to the input of the same counter to prepare it for counting. discretes as well as to the first inputs of elements 11 and 12 for counting the path of movement of the strip. If the strip in the butt welding machine zone moves in the direction of the Forward mill, then the second output of block 5 shows a signal that goes to the second input element a 12 And, at the input of this element also shows a signal that goes to the positive counting input of the counter 9

If in the zone of the butt-welding machine the strip moves in the direction opposite to the mill, that is, Back, then the first output of block 5 is a signal that arrives at the second input of element 11 I, and the output of this element also shows a signal that goes to negative counting input counter 9

Thus, at the output of the counter 9, there will be a code proportional to the distance of the seam from the butt welding machine, which will go to the second input of the comparison unit 25. At the moment when the seam reaches the control distance from the butt-welding machine, at the output of the block 25, a pulse signal is received, which enters input S of the trigger 26, as a result of which a output signal arrives at its output Q, which arrives at the second input of element 27 And from the output of block 25 will go to input C of counter 28 and from the output of adder 23, the value of the distance of the seam to the first stand 19 will go to the input of counter 28,

When moving the strip at the input of the mill from the output of the sensor 17 to the negative 5 counting input of the counter 24 pulses will be received. Upon reaching the sampling value set by the knob 21, the output of the counter 24 is turned on the signal that comes to the input from this counter for counting the next discrete and on the first input of the element 27 And, on the output of which the signal going to the negative counting input of the counter 28

The value of the distance of the seam to the first

5 cages 19c, the output of the counter 28 is fed to the input of the display 29 and to the input of the mill speed control device. At the entrance of the seam to the first cage at the second output of the counter 28, the signal that will go

0 to the input of the seam tracking device in the cells and to the R input of the trigger, as a result, the signal from the Q output of the trigger will disappear and the device will be prepared to monitor the next seam, which goes to the edge of the welding machine.

Thus, the device really allows to increase the reliability of the weld registration relative to the first mill stand while simultaneously increasing the accuracy of tracking the weld coordinate.

Technical efficiency is achieved due to the fact that the registration of the band reserve is not carried out directly

5 after the end of welding, and after moving the strip with the weld for a certain distance behind the butt welding machine, when the sagging of the strip is eliminated, as a result, the accuracy of tracking the weld with respect to the first mill stand is ensured. This makes it possible to improve the quality of the strip by reducing the length of the non-conforming part of the strip in the weld zone, as well as to increase the mill productivity by timely issuing commands to slow down and accelerate the mill, since it is premature to issue a slowdown command when the weld is added to the mill inlet and to lag

0 in issuing commands for overclocking when the seam leaves the last stand, they reduce the mill productivity.

In addition, accurate determination of the position of the seam relative to the first stand makes it possible to prevent emergencies that may occur when the seam enters the first stand at an increased speed due to the late issuance of a command to slow down the mill.

Claims (1)

The invention The tracking device for the weld coordinate in the endless rolling mill, contains the first pulse sensor mounted on the axis of the tensioner roller located behind the butt welding machine, the control circuit of the direction of movement of the strip, the first pulse count pulse generator, the first pulse counter, the counter the coordinates of the seam relative to the butt welding machine, the control device of the butt welding machine and two elements, And, the outputs of the first pulse sensor and the first sensor are disc The pulse counters are connected to the first (counting input) and second (count setting input) inputs of the first pulse counter, and the output of the butt welding machine control device is connected to the third inputs (reset inputs) of the first pulse counter and pulse counter of the joint coordinate relative to the butt welding machine, the output the first pulse counter is connected to its fourth (installation input zero) input and the first inputs of the first and second elements And, the second inputs of which are connected respectively to the first (Forward) and volts The rear (back) outputs of the control circuit of the direction of movement of the strip, the outputs of the first and second elements And are connected to the first and second inputs of the counter seam coordinates relative to the butt-welding machine, characterized in that, in order to increase the reliability of the weld registration relative to the first mill stand while simultaneously increasing the accuracy tracking the seam coordinate, it is equipped with a sensor for registering the reserve of a strip in a loopback device mounted on the winch of the loopback device, a second Pulse sensor, a mouthpiece new on the axis of the tensioner roller located in front of the first mill stand, the gauge of the band reserve constant, the second unit pulse counting increments, the setter of the weld control distance behind the butt welding machine, adder, second pulse counter, comparison unit, trigger, third element, the seam coordinate counter relative to the first stand of the mill and the indicator board, the outputs of the second pulse sensor and the second sensor of the pulse counting pulses are connected to the first (counting input) and the second (counting input) the inputs of the second pulse counter, the output of which is connected to its third input and the first input of the third element I, the output of the set control distance of the seam is connected to the first input of the comparison unit, the second input of which is connected to the output of the counter of the seam coordinates relative to the butt welding machine, the output of the comparator unit is connected to the first (installation input) and the third inputs, respectively trigger and counter coordinates of the seam relative to the first mill stand, direct trigger output is connected to the second input of the third element I, the output of which is connected to the first (counting) input of the counter the coordinates of the seam relative to the first mill stand, the outputs of the setting unit of the band reserve constant and the sensor of registering the strip reserve are connected respectively to the first and second inputs of the adder, the output which is connected to the second (input setting reference) the seam coordinate counter relative to the first mill stand, and the output of the seam coordinate counter relative to the first mill stand is connected to the second (reset input) trigger input and indicator board. geesh 2