SU713629A1 - Apparatus for automatic decelerating and precise arresting of reversible cold-rolling mill - Google Patents

Description

The invention relates to the field of rolling mill automation and can be used as a device for quick and accurate stopping at the end of the rolling process, as well as slowing down cold rolling mills on welds. The closest in technical essence and the achieved result is a device for automatic shutdown of cold rolling reversing mills, which contains a strip turn sensor, which is fed to a winder, and a scaler, which generates a voltage, calculated for the mill. The ego voltage is compared with a value proportional to the sum of the stresses of the stand cage and unwinding winder in order to maintain a constant rate of deceleration in all aisles, regardless of the total rolling speed and magnitude of the pbg of the metal in frame 1. In this device, the deceleration rate of the mill is chosen in advance and remains constant in all passes regardless of the actual load of the electric drive of the mill. When choosing a constant pace in all the passes, it is impossible to ensure the minimum mill slowdown time in most passes, which reduces the performance of the mill. When the mill is decelerated in the most severe mode, due to the current loading condition, the electric motor p & a of the unwinding winder is located, because to ensure the constant tension of the metal between the mogap and the stand, the GOK of the rotor circuit increases to compensate for the dynamic moment, which is equal to the angular acceleration of the ; moment of inortia flywheel mass drive winder.

The moment of the electric motor, the kompysing moment of inertia of the coiler, can be represented as. - dynamic coke gok and engine unwinding MO jackdaws; F -. excitation flow; Sl - constant coefficient. Therefore, the angular acceleration of the winding is determined from the condition that the expression is equal to (2), i.e. same. or that with - MFDLDA. 1 © .. The maximum rate (y corresponds to the highest current value, which is determined from the expression. (5) - the maximum permissible LOH value of the motor current of the winder; the charger is the current creating tension bands in this pass. Depending on the selected current value nat For the motor flow, the slowdown rate of the unwinding winder determines the expressions g mS the same, in the form or, what is Sl A-0G. The maximum acceleration of the drive of the stand is expressed in terms of, and the mill parameters K..eA.k (8 where LDdr radius drum winder; - radius of work rolls BrAZ kmax must be thinned out for each pass in segregated NOSTA expression of c- SA ,. to wdvt I hiax In constructing systems to accurately structure of the stop must be performed under conditions e6- (tt) -i -r denoting a, 8

we have

- “(u;

Claims (1)

(11) or what is the same. i Thus, coefficient C of expression (11) or & expressions (12) are functionally dependent on (9). Only won w - -% ko when executing expressions (11) and (12), the deceleration time of the mill will be minimally possible in each separate skip. The purpose of the invention is to increase the productivity of the mill. This is achieved by the fact that the device for automatic slowing down and exact stopping of the mill contains a strip turn sensor wound on an unwinding winder drum, a trigger meter and a functional design speed converter, the output voltage of which is compared to the sum of the cage tachogenerators and the unwinding winder, additionally The setting devices of the maximum allowable current and the tension current of the unwinding winder are entered, which are connected with the complement through the comparison amplifier and the first multiplication unit. nym functional converter comprising deceleration rate, which output is connected to the second multiplying unit, the last entry is associated with a functional design speed converter, and an output connected to the comparing unit with the sum of voltages tachogenerators stand and unwinding coiler. The drawing shows a functional diagram of an apparatus for automatically slowing down and accurately stopping a cold rolling mill. The device contains a strip turn sensor 1 connected via a trigger counter 2 and a code-analog converter 3 with a functional speed converter 4, the output voltage of which through the washing unit 5 is applied for comparison with the total voltage of the stand tachogenerators and the unwinding winder on the amplifier 6. In addition, the device includes adjusters 7 and 8 of the maximum permissible total current of the korna circuit and the current creating its tension of the unwinding winder, the signals of which are fed through the comparison amplifier 9 and on 10 multiplications, the input of which is connected to the excitation winding of the motor of the unwinding winder, and the output is connected with an additional functional converter 11, the output of which is connected to the second multiplication unit 5, connected with the input of the functional converter 4 of the calculated speed, and the output co comparing amplifier 6 With the shaft of the unwinding reel drum, sensor 1 is connected. connected to the input of the trigger meter 2, working on the subtraction. When pulses are received from the sensor of the remainder of the turns, the readings of counter 2 decrease and, consequently, the voltage of the converter 3 decreases the code-analog, the voltage of which is directly proportional to the remainder of the stopping distance of the mill. In order to calculate the calculated speed of the crank for the rest of the stopping distance, the output voltage of the block is fed to the input of converter 4. The voltage from the output of converter 4 goes to the first input of multiplication unit 5, to the second input of which a signal proportional to the coefficient in expression (12) is applied. At the output of block 5, a signal is generated that is proportional to the calculated angular velocity determined from the conditions of deceleration of the mill with maximum. but a deceleration rate permissible in a given pass, according to expression (9). Blocks 7 ... 11 are used to determine the magnitude of the expression ratio (12). Using the setpoint 7, the amplifier 9 gives a signal about the maximum possible current of the motor to soften the coiler, and set the value of the unwinding winder current, which is directly proportional to the selected: this band pass tension. The resulting (difference) signal of amplifier 9 determines the maximum current value of the dynamic compensation of the unwinding winder. The voltage from the output of the amplifier 9 is supplied to the first input of the multiplication unit 1O, and a signal proportional to the excitation flow of the unwinding winder is supplied to the second input. Thus, at the output of the block 10, a voltage is formed that is directly proportional to; the minimum rate of deceleration of the mill | according to expression (9). The voltage from the output of the 1O unit is fed to the input of the functional converter 11 to form the output of the last signal proportional to the coefficient ELI (12). The moment of the start of deceleration is determined by comparison of the output signal of the block 5 with an amplifier equal to the sum of the voltages of the tachogenerator of the Urrc stand and; unwinding winder Ujj- The output voltage of the amplifier 6 U C through diode 13 is fed to the input of the control gear of the mill, which changes the mill speed to match it with the remaining braking path on the unwinding winder, the deceleration time of the mill is inversely proportional to the acceleration value deceleration, which is determined from the expression (9). So the cat on high-speed camps Flah IA can vary in .f wide limits, then the value -, (. Consequently, the mill slowdown time can vary greatly. Preliminary calculations show that the performance of the high-speed mill can be increased by introducing the allowable deceleration rate along the aisles by an average of 2-3%. When using the proposed device, the productivity of the mill is increased by shortening the deceleration times of the mill. The automatic slowing down and precise stopping of the cold rolling mill reversal, comprising a comparison amplifier, a strip turn sensor, remaining on the unwinding winder, connected via a trigger counter and a code-analog converter with a functional converter of the calculated speed, and the inputs of the comparison amplifier are connected to tachogenerators of the stand and unwinding Therefore, in order to increase the mill productivity by reducing the retarding time, it additionally contains The detectors of the maximum permissible current of the core circuit and current, which creates the tension of the unwinding winder, the second comparing amplifier, two multiplication units and a functional converter, moreover, the setting units are connected to the inputs of the second comparing amplifier, the output of which is connected to the first input of the first multiplication unit , the second input of which is connected with the excitation winding of the motor winder, and the output through the functionality of the NL-1N converter with 7713629 first input of the second multiplication unit, the second input of which is connected to you Odom transducer design speed and output to the first amplifier sravnivayushim. pr NO Sources of information that are considered in the examination 1. USSR author's certificate 172893, cl. B 21 B 37 / GS, 1962.