SU659219A1 - Apparatus for automation of rejection of defective rolled stock - Google Patents

Description

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The invention relates to the field of automation of rolling mills, and more specifically to the automation of inspection and inspection of rolled products.

The invention can most effectively be used in mills that are subject to higher requirements for the design of rolled products.

A device for automatic grading of rolled products is known, comprising a flaw detector, a cutting device, a displacement transducer, and a logical calculating and decisive command system. The operation of the device is such that the rolling is first defect-proofed, then cut and then sorted 1.

The disadvantage of such a device is that it does not take into account finding a defect in the area of scatter of the place of the previous cut, due to which a scrap may fall into a batch with a good rental or a good rental may be sent to a marriage. This is due to the fact that the cutting of the rolling edge of the rolled metal to measured lengths is carried out with some degree of accuracy. If there is a defect in the zone determined by the possible variation of the place of the upcoming cut, there is an uncertainty in the screening of the rolled stock, since the position of the cut plane in this zone is probabilistic in nature. It means,

that it is impossible to determine unambiguously where the defect is, if the flaw detector indicates the presence of a defect in this zone, - before or after the place of the cut and, respectively, in the section to be cut or in the subsequent section of hire. Therefore, in order to exclude the rejection of rolled products into the batch with the suitable one, in case of detection of a defect in the area of scatter of the cut point, both pieces of rolled metal, adjacent to the cut plane, should be discarded. However, this is not taken into account in the known device.

The closest to the invention to the technical essence and the achieved result is a device containing a flaw detector installed in front of the cutting device, a transport line and a displacement sensor kinematically associated with it, a logical block controlling mechanism of grading, consisting of a binary counter with programmable conversion factors, taking into account the length of the sheet and the tolerance on it, and the position sensor of the cutting mechanism, with which the program is entered into the counter, corresponds to the distance from fektoskop to the beginning of the zone of cut 2.

A disadvantage of the known device for the automatic sorting of rolled products is that the scatter zone of the place of the preliminary cut of the rolled metal is determined only as a function of length, since the programmable conversion factors take into account the length and the tolerance for it. Thus, only the errors of the measuring system are recorded. But the scatter of the cut is also determined by the errors of the executive system, which depend on the speed of rolling, as it is known that the slower the speed, the more precise the cut, and accordingly the greater the speed of rolling, the greater the spread area cut. Since the speed of rolling in such a device is not taken into account, there is a discrepancy at a controlled interval and the true value of the scatter area of the cut point. In this case, two cases are possible: the controlled interval is less than the true zone of scatter of the cut point; controlled interval is greater than the scatter zone of the cut. In the first case, a marriage can get into a suitable rental, and vice versa - suitable rental can get into the marriage. In the second case, the amount of good rolled products sent to the marriage increases. Another disadvantage of the known construction is that the discreteness of the reference system does not allow achieving exact correspondence between the controlled interval, in which there is a zone of scatter of the cut point, and the true value of the scatter zone of the cut point, which also leads to the above-mentioned disadvantages.

The aim of the invention is to more accurately determine the scatter area of the cut to reduce the amount of good rolled products entering the marriage in the presence of a defect in this zone.

The goal is achieved by the fact that the device for automating rental screening, containing a transport line, a displacement sensor kinematically associated with it, a flaw detector mounted in front of the cutting mechanism, a measuring unit for measuring the lengths of rolled products, a logical block controlling mechanism for screening, is equipped with a speed sensor, a speed integration link rolling movements, a threshold element, an adjusting resistor, an inverter, a coincidence circuit, a trigger, an amplifier, and a relay.

Such a constructive implementation allows, by integrating the speed of rolling, to determine the required limits of rolling control for defects in the area of scatter of the cut point.

The drawing shows a block diagram of a device for automating the sorting of rolled products in the event of a defect in the area of variation of the cut point.

The device for automating rental grading includes a line 2 for transporting rolled products 2, a flaw detector 3 installed in front of the cutting mechanism 4, a displacement sensor 5, kinematically associated with the line 1 for transporting rolled products, a unit 6 for measuring the measured lengths of rolled products, a logic unit 7 for controlling the mechanism 5 8 rental screening, a rolling speed sensor 9 connected via an integrating element 10 and an adjusting resistor 11 to the input of the threshold element 12 by means of the closing contact 13 of the relay 10 14. The integrating element 10 is um of a resistor 15 and capacitor 16. The switch 14, which switch is performed in the spread zone 17, entry point places the cut flaw in the control box, connected to

15 output of the amplifier 18. The input of the amplifier 18 is connected to a single output of the trigger 19, which is controlled by means of a unit 6 for measuring the measured lengths of rolled products. The output of the threshold element 12 is connected via a matching inverter 20 to the coincidence circuit 21, to the other input of which the output of the flaw detector 3 is connected. The output of the coincidence circuit 21 is connected to the logic unit 7 controlled by the machine 8 debarking.

The device works as follows. During the movement of the rolled block 6 of the reference of the measured segments, in which the programs for the length of the segment / and the distance a

0 from the flaw detector 3 to the cutting mechanism 4, counts the pulses from the sensor 5 for moving the rolled metal.

At the moment of approaching the place of the coming cut to the flaw detector 3, the block 6 of measuring the measured lengths of hire gives the command / -a (there are meters left before the cut), the beginning of the zone 17 of the cut-off area in the control field of the flaw detector 3. This command is remembered by the trigger 19. In this case, the amplifier 18

0 turns on the relay 14, the closing contact 13 of which has a voltage proportional to the rolling speed from the rolling speed sensor 9 is connected via the integrating link 10 and through the adjusting resistor 11 to the input of the threshold element 12. The response time of the threshold element 12 depends on the rate of voltage change the charge of the capacitor 16, which in turn is determined by the corresponding voltage value, is proportional to the speed of movement of the rolled metal.

With a linear approximation of the exponential dependence of the charge of the capacitor 16, the relationship between the response time of the threshold element 12 and the speed of rolling is linear and inversely proportional, i.e., as the speed increases (voltage proportional to speed), the response time of the threshold element decreases

d /

/

Since the beginning of the charge of the capacitor 16 coincides with the moment of passage of the beginning of the zone of variation of the cut point (command / -a), then by adjusting by the resistor 11 the time of the triggering of the threshold element 12, you can choose such a time between the start of the charge of the capacitor 16 and the moment of operation of the element 12, for which the rolling passes a distance equal to the scatter area of the cut.

With the arrival of the / -a command, a zero signal is set at the inverse of the output of the flip-flop 19. At the output of the threshold element 12 until it triggers, there is also a zero signal. Then the output of the inverter 20 and the input of the coincidence circuit 21 (until the threshold element 12 is triggered) sets the signal I. And if at this time a signal about the presence of a defect comes from the output of the flaw detector 3, then the output of the coincidence circuit 21 shows the presence of the defect in the area of variation of the cut, which is fed to the input of the logic unit 7 control mechanism 8 sorting hire. In this case, both pieces of rolled products adjacent to the cutting plane are dumped into the marriage. The end of the cut-off area is determined by the triggering moment of the threshold element 12.

The trigger voltage of the threshold element 12 and all modes of operation of the device are determined from the known expression

and, and, 1-1

the de-time of the charge of the capacitor 16 until the triggering of the threshold element 12 at a given speed of movement of the rolled material V and the zone of scatter of the cut point A / cut;

t .Ri5-C is the time constant of the integrator 10, consisting of a resistor 15 and a capacitor 16; UQ is the voltage on the capacitor 16 in the steady state mode, taking into account the voltage divider Uc from the car speed sensor 9 formed by the resistors 15, 11 and the input resistance of the threshold element 12.

The proposed device for automating the grading of rolled products in comparison with the best samples of similar equipment allows us to more accurately determine

boundaries of rolling control for defectiveness in the area of scatter of the cut point, which improves the quality of the sorting of rolled products by reducing the number of good rolled products that get rejected if defects of rolled products are found in the area of scattering of the cut site, while reducing the cost of finding suitable rolled products for this reason) not in marriage.

F o rm} l and inventions

A device for automating the marking of the rolled products containing a transport line and kinematically connected with

there is a displacement sensor, a flaw detector installed in front of the cutting mechanism, a unit of reference for the measured lengths of rolled products and a logic unit controlling the sorting mechanism, characterized in that

In order to improve the accuracy of determining the area of scattering of the cut to reduce the number of good rolled products entering a marriage in the presence of a defect in this area, it is additionally equipped with a speed sensor, a rolling speed integration link, a adjusting resistor, a threshold element, an inverter, a coincidence circuit, a trigger, amplifier and relay, and the speed sensor

rolled wire is connected via a closing contact of the relay, an integration link and a control resistor to the input of the threshold element, the output of which through the inverter is connected to one of the inputs of the coincidence circuit, the output of the coincidence circuit is connected to the other input of the fault detector , the relay is connected to the output of the amplifier, the input of which is connected to the single output of the trigger, and the inverse output of the trigger is connected to the second input of the inverter, while one trigger connected to the output of the unit of reference of the measured segments

rolled.

Sources of information taken into account in the examination

1. USSR author's certificate N ° 267093, cl. In 23G 21/00, 1969.

2. USSR author's certificate number 175027, cl. B 21B 37/00, 1963.

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