SU993038A1 - Device for checking metal losses in rolling stock cutting on blooming mill shears - Google Patents

Description

The invention relates to a weight-measuring technique, in particular, to devices for calculating the theoretical weight of products.

A device for determining the theoretical weight of the rolled product is known, which contains a setpoint input unit, scoring units, output counters, a billet weight meter, a roll length meter, a pulse generator, a nominal weight unit of the roll length unit, a pulse counter, a divider, a comparison node, a digital display unit. The total weight of the roll is 1. The disadvantage of the known device is that it does not contain solutions that allow to establish control over the loss of metal, for example, when cutting steel on scissors of crimping new.

The closest in technical essence to the present invention is a metal loss monitoring device for cutting steel on crimping mill shears, containing a roll length meter at the input of scissors and a suitable roll length meter, unit for the nominal weight of the roll length unit, connected via a frequency divider to a pulse counter, the output of which is connected to one of the inputs of the comparison node, the output of which through the inverter is connected to the control input of the valve, to the switching input of which a pulse generator is connected in and to the output - a frequency divider counter rolls total weight and the total weight of suitable counter rolled, the outputs of which

10 are connected to the inputs of the subtractor, and the digital display unit E.

However, such a device does not provide the necessary accuracy of control, since in determining the losses

15 of the metal in it does not take into account that the mass of a unit of the length of the metal cut, than the mass of the corresponding length of the suitable metal due to non-metallic inclusions, lack of solidity,

20 looseness, violation of the geometry of the end of roll, etc.,

The purpose of the invention is to improve the accuracy of control by reducing the impact of a mistake in determining the theoretical weight of the roll. The goal is achieved by introducing a metal loss detection unit, a trimming weight correction unit, a unit for controlling metal consumption per unit of production, a switch, two a subtractor and two keys, with the outputs of the roll length meter at the input of the scissors and the meter length of a good wire are connected respectively to the first and second inputs of the switch, the first output of which is connected with the other input of the comparison node, and the second (the swarm and the third outputs - respectively. with the control inputs of the first and second keys, with the switching inputs of which the output of the valve is connected; the output of the first key is connected to the input of the total weight counter of the expansion key; and the output of the second key is connected to the input counter of the total weight of suitable steel, the output of which is connected to the second input of the unit controlling the consumption of metal per unit of usable product, to the first input of which the output of the second subtraction unit is connected, the INPUT1L of which are connected respectively With the output of the counter total weight of the rolls and the first subtraction unit, the inputs of which are connected respectively to the outputs of the subtractor and the metal loss detection unit connected to the outputs of the subtractor and the weight correction unit of the detector, and the outputs of the metal determination unit and the metal consumption control unit per unit the products are connected to the inputs of the digital display unit. The drawing shows the technological scheme of the control object and the block diagram of the metal loss control device. The roll 1 of the specified melting enters the roller table 2 to the scissors 3, from where the roll 4 after cutting (rental is transported by the roller conveyor 2. The control device contains a meter 5 of the length of the roll 1 at the input of the scissors 3, a meter 6 of the annual hire length (after the scissors 3),. 7, comparison node b, pulse counter 9, frequency divider 10, setting unit 11 of nominal weight of unit of length 1, inverter 12, valve 13 (key, pulse generator 14, first clamp 15, counter 16 of total weight of rolls, second key 17 , counter 18 total weight of rolled products, subtracter 19, the metal loss determining unit 2, the weight correction unit 21, the first subtraction unit 22, the second subtraction unit 23, the meter consumption control unit 24 per unit of usable output and the digital indication block 25. The output of the peal length meter 5 is connected to the first input switch 7, the second input of which is connected to the output of the gauge 6 of the available hire.The first output of the switch .7 is connected to the first input of the comparison node 8, the second input of which is connected to the output of the counter 9 pulses. The output of the frequency divider 10 is connected to the input of the pulse counter 9, the first input of which and simultaneously the switching inputs of the keys 15; and the output of the valve 13 is connected to the second input of the frequency divider 10 connected to the output of the setpoint 11 of the nominal weight per unit length of hire. The output of the comparison node 8 is connected to the input of the inverter 12, the output of which is connected to the control input of the valve 13. The output of the generator 14 is connected to the switching input. The output of the switch 14 is connected to the control input of the switch 15 and the switch 17 to the control input of the switch 15. - the third output of the switch 7. The output of the key 15 is connected to the input of the counter 16 connected by its output to the first input of the subtractor 19 and the first input of the second node of the subtractor 23. The output of the key 17 is connected to the input of the counter 18 connected by its output to the second input of the subtractor 19 and the second input of the block 24. The subtractor 19 is simultaneously connected to the first input of the node 22 b to the first input of the block 20, to the second input of which the output of the trimming weight correction unit 21 is connected. The output of the block 20 is connected to the second input of the node 22 and the second input of the block 25 of the digital display. The output of the node 22 is connected to the second input of the subtracting node 23, the output of which is connected to the first input of the unit 24, which is connected to the first input of the digital display unit 25 with its output. The device works as follows. Before entering rolls 1 of a given heat on the roller table 2, hot cutting shears 3 use the setting device 11 to enter data on the nominal weight of the effective length of the roll, for example, one centimeter, and using the block 21 to cut weight data. When transporting rolls 1 with roller table 2 to scissors 3, the length of rolls before cutting is determined with the aid of a gauge 5. Information about the length of the rollout from the output of the meter 5 is fed to the first input of the switch 7 and then from the first output of the switch 7 to the first input of the node 8 of the comparison. Simultaneously, from the second output of the switch 7, the control signal is fed to the control input of the key 15. The switch 7 is controlled by a photo sensor unit, which is included in the length meters 5 and 6 (the switch control circuit is not shown in the drawing ;. from the first input of the switch 7 to the first input of the comparison node 8 is compared with the code of the number of pulses received from the pulse counter 9. The counter 9 receives the pulses from the 10-hour divider, whose division ratio is equal to the nominal weight at the running unit of the length of the roll, set using the setting device 11 .. Pulses from the generator 14 are received at the input of the split l 10 through the valve 13. When the code of the length of the roll comes from the meter 5 through the switch 7 to the first input of the comparison node 8, at its output A signal O appears, which is inverted by the inverter 12 and opens the valve 13. In this case, the pulses from the generator 14 arrive at the input of the split l 10 and through the switch 15, which is opened by the signal coming from the second output of the switch 7, go to the counter 16 total weights of races Lat. When the number of pulses in the counter 9 becomes equal to the number determined by the roll length code of the meter 5, a signal 1 appears at the output of the comparison node 8, which is inverted by the inverter 12 and closes the gate 13, thereby prohibiting the generator 14 from passing the counter 16 and the divider 10 frequencies. The number of pulses in the pulse counter 9 will correspond to the length of the roll. Since the counter 16 is connected via the valve 13 and the switch 15k to the generator 14 of pulses, and the counter of pulses 9 through a frequency divider 10 with a division factor equal to the nominal linear weight for the length of the roll, then during the closed state of the valve .13 16 tupit number of pulses equal to the number of pulses, determined by the code of the length of the piece, multiplied by the division factor of the divider 10, i.e. the nominal weight of the unit of the length of the sale, which determines the nominal weight of this piece. Thus, for some period of time, for example, an hour, a shift, the counter 16 accumulates information about the theoretical weight of rolls coming under the cut. After cutting off the defective part of the roll, the length of the available rolled products is measured by the meter 6. Information about the non-suitable rolled products goes to the second input of the switch 7 and then from the first output of the switch to the first input of the comparison unit 8. Simultaneously, from the third output of the switch 7, the signal arrives at the control input of the switch 17. The conversion of the suitable rolled metal into theoretical weight is performed as large as the length of rolls, only in this case the pulses from the generator 14 are fed to the input of the counter 18 of the total weight of good rolled through the fan. 13 and key 17. In counter 18, information is accumulated on the theoretical weight of good rolled products produced per hour, shift and other analyzed period of time. Information on the total theoretical weight of rolls from the outputs of the counter 16 is continuously fed to the first input of the subtractor 19, the second input of which receives information from the output of the counter 18 of the total theoretical weight of good rolled products. The subtractor 19 implements the operation of subtracting from the total theoretical weight of the rolls, the total theoretical weight of the rolled steel, and thus the theoretical weight of the metal loss is determined when cutting the rolls with the shears of the mill. 9tp-tr- “tg where Q p is the theoretical weight of rolls; Q is the theoretical rolled weight. However, due to nonmetallic inclusions in metal waste, inconsistency, friability, and violation of the geometry of the end of roll, metal losses will be somewhat less than that calculated from this expression. From practice it is known that the mass of a unit of the length of a metal cut-off, depending on the steel grade, is on average 7-10% less than the mass of a suitable length of rolled steel. To determine the actual loss of the metal when cutting rolls on the shearing mill shears, a trimming weight correction unit 21 is provided in the device, with which the data on the percentage ratio of the length unit of the trim weight to the unit length of the available rolled weight, i.e. weight data per running length are entered. For example, for certain grades of steel, the weight per running centimeter of a suitable metal is 10 kg, while the weight of a running centimeter of trimming will be within 9.0-9 j6 kg. The output of the correction unit 21 is connected to the second input of the metal loss determining unit 20, to the first input of which the output of the first subtractor 19 is connected. In block 20, the theoretical weight multiplied by the above formula is multiplied by the coefficient K, which is equal to the weight of the cut length roll, and thus corrects the metal loss data when cutting rolls.

These data are determined for each heat, recorded in the metal loss unit 20 and stored there for a certain time, such as shift, day, information about metal loss is continuously received, from the output of the unit 20 to the second input of the digital display unit 25 and to the second input node 22 subtraction.

Of great importance for the qualitative assessment of the work of the blooming mills is the determination of the amount of metal consumed per unit of usable production, i.e. the definition of the so-called expenditure coefficient K-, determined from

KI ISQIE.

TGOA where, „, the amount of metal consumed per unit of usable product is the amount of suitable metal. For example, K 1.335, which means that 1,335 metals are consumed per ton of good steel. Usually, metal losses due to carbon loss are small, and the bulk of metal losses on the squeeze mills are spent in trimming. The determination of the expenditure coefficient K "of the metal is carried out as follows. From the output of the subtractor, information about the preliminary consumption of metal is cut to the first input of the node 22, the second input of which receives information from the output of the metal loss determination unit 20. Since the value of Q. is larger, in subtraction unit 22 it is determined from the l-calculation of the theoretical weight of rolls. l g D 3tras, Q tp tpkhor The signal from the output of node 22, proportional to the error of determining the theoretical weight of rolls, goes to the second input of subtraction node 23, the first input of which receives information about the theoretical weight of rolls from the counter output 16. Subtracter 23 subtracts from the magnitude of the total weight of rolls, the magnitude of the error in determining the theoretical weight of rolls, caused by the discontinuity of the ends of the roll, non-metallic inclusions, geometry violation, and other reasons .. Thus, from the output of node 23 to n rvy input unit 24 controlling metal flow per unit of usable products supplied signal carrying information on a mass of metal in peals OtmRS5sG- ra "triples

To the second input of the unit 24 controlling the consumption of metal per unit of usable products comes from the output of the counter 18 information about the theoretical weight of suitable rolled metal.

B. Block 24, by dividing the QTM value of the roll, is determined by the expenditure ratio of the metal K, significant -. the idea of which from the output of the block 24 is continuously fed to the first input of the block

25 digital display.

Claims (2)

 1. USSR author's certificate 560145, cl. G 01 G 9/00, 1976. 2. USSR author's certificate 71-7551, cl. G 01 G 9/00, 1977 (prototype). five "Sj "Uh 00 ChE vr TT: 7 L r fr r - “sj