SU939147A1 - Rolling mill correct operation monitoring apparatus - Google Patents

Description

This invention relates to automatic means of controlling a technological process, in particular, in the rolling industry of metallurgical industry.

A control device is known which contains sensors of the presence of a roll installed (metal in the mill line, referred to as a roll, installed at the mill output — rolling), a sensor of pulses for moving the roll, kinematically connected with the drive of rolling rolls. , the AND gate, the inputs connected to the first sensor of the presence of a roll and the pulse sensor of the movement of the roll, and the output with a counter operating in the mode of comparing the current path of the forward end roll between the sensitivity zones of the presence of roll.

If a rolling mode violation occurs (for example, the front end of the roll does not exist before the last stand and does not pass to the exit of the stand group), then a number equal to the set value is counted in the counter, and the driver from the signal

Comparison in the counter will generate a signal about the rolling process which will arrive at the output of the device to control the corresponding mill mechanisms and signal the violation of the rolling mode.

The main disadvantage of this device is that the control of the mill operation is performed only by passing the front end of the roll through the control section, but does not control the work of the mill during the passage of the rest of the roll, which

15 value exceeds several times (up to 1000 and more) the length of the control section, limited by sensors.

 In addition, the violation signal

20 of the rolling mode in this device is formed with a delay equal to the time the front end of the roll passes the distance between the photosensors, which reduces the efficiency

25 control over the work of the camp.

The closest in technical essence and the achieved effect to the proposed is a control device containing sensors

30 rolls in the mill rolls of two adjacent stands, the gap between the crust is monitored by the device in question, the sensor for the presence of roll installed in the middle of the monitored section, the generator of a pulse-reversing counter, inputs connected with sensors and a generator, and the output of the counter through a comparison circuit (comparator) connected to the input of the control signal conditioner. The operation of the known gadget is as follows. When the first mill rolls in front of the end of the roll are received by the sensor signal, the counter begins to count the pulses from the pulse generator in the addition mode. When the roll reaches the sensor's sensitivity zone, the counter switches to the subtraction mode. When the forward end of the roll is fed into the mill rolls of the output stand, the counter stops counting the generator pulses at the sensor signal of the presence of roll out of this stand. According to the code recorded in the counter, the comparator and the former produce a control signal for the operation of the mill. In the event that the counter transition signal (taking into account the tolerance) comes before the signal from the sensor, the generated signal produces neither a rolling mode signal, and if the signal O of the counter comes after the signal from the sensor, a signal will be generated that the mill is working properly 2. However, control over the correct operation of the mill is performed only when advancing the front of the roll mill in the area between the stands, a signal about the violation of the rolling mode is formed with a delay equal to the passage time of the forward end of the roll between the rolls, and Also, a rolling disturbance control signal will not be generated if the roll does not reach the sensor due to an unexpected stop of the end of the roll (if there is an emergency situation on the section). The purpose of the invention is to increase the speed and reliability of the device. The goal is achieved by the fact that the three gauges of the presence of the gauge are installed in the interstand gap of the pack in such a way that their sensitivity zones are oriented mainly perpendicular to the direction of rolling, limiting the rolling position allowed for the roll, the OR element and the pulse selector are introduced, the output of which is connected to the input the control signal generator, and the input of the pulse selector through the OR element is connected to the outputs of the sensors of the presence of roll. FIG. 1 shows a functional diagram of the proposed device; in fig. 2 shows a variant of the location of the sensors relative to roll and rolls. The device for monitoring the proper operation of the rolling mill contains sensors 1, an OR 2 element, a pulse selector 3, a control signal shaper 4, the output of which is the device output, roll 5, roller 6 rollers, rolls 7. Sensors 1 are connected through element OR 2 with a selector 3, the output of which is connected to the input of the former 4, Sensors 1 are installed in the mill spacing, their axes of sensitivity zones are oriented mainly perpendicular to the rolling direction, thus limiting the permissible and the correct position of rolling of roll 5. The pulse selector 3 is the maximum duration of the pulse selector which passes the output pulses, whose duration is greater than some fixed length. The fixed pulse duration is chosen, on the one hand, from the increased noise immunity of the device under possible short-term effects of rolling on the sensors and, on the other hand, from the minimum delay of the control signal relative to the moment of rolling disturbance. Structurally, the pulse selector 3 can be made, for example, in the form of a pulse delay element for a fixed time with a circuit for comparing the time position of the delayed and non-delayed pulses. Shaper 4 of the control signal can be made in the form of successively connected one-shot, produced a pulse of the required duration, and output buffer amplifier, and also, in the absence of the need to form the duration of the control signal, in the form of serially connected IITit trigger and buffer output amplifier. The device works as follows. In the initial state, the sensors 1 output to the inputs of the element OR 2 zero signals, in the presence of which at the output of the element OR 2 pulses are not generated. The pulse selector 3 and shaper 4 are in the initial state, in which the output signal of the device indicates the correct course of the run-in process.

With proper rolling, roll 5 does not go beyond the zone bounded by the sensitivity zones of sensors 1 and roller b of the roller table. Sensors 1 do not generate a signal of presence in their sensitivity zones of roll 5, i.e. still in their original state. The shaper 4 of the control signal generates and outputs to the device output a signal on the correct course of the rolling process and the correct operation of the rolling stock as a whole.

If one of the sensors 1 operates for a short time, for example, from a spark of a hot roll, then the short pulse transmitted through the element OR 2 will not allow the selector 3 to reach its output, since the duration of the incoming signal is less than the fixed duration that the selector 3 is set to. Shaper 4 will continue output a device signal about the correct operation of the mill.

In case a rolling disturbance occurs (for example, if the front end of roll 7 is abutted into the mill equipment or

running into

roll when the first

As the rolling progresses, the stand increases the speed of rolling compared to the speed of rolling in the second stand. Peal-from excess length begins to bend and leave the normal position. Thus, the roll enters the sensitivity zone of one of the sensors 1, which in this case produces a pulse of such duration that exceeds the fixed duration of the selector 3. The latter gives a signal to the input of the imaging unit 4, which generates (in duration and / or shape and power) a signal violation of the rolling process, entering the system of automatic control of the mill. On this signal, the operator takes appropriate measures to prevent an emergency.

The device allows to increase the monitoring speed due to the fact that the rolling disturbance signal is formed at the beginning of the violation, and the elimination of such complex components as

pulse counter, code comparison unit, angular velocity converter of mill rolls to pulse frequency (generator) simplifies the design of the device and, therefore,

increases its reliability. In addition, the formation of a signal about rolling disturbance not only at the time of the passage of the controlled part 1 but the front end of the roll, but also ostgshnoy

part of it increases the accuracy and reliability of the control.

Claims (2)

1. The indicator of the passage of the rollout type YPR-1 SPKB. Technical Report 9241-00-OOTO. Uralchermetavtomatika 1966. 2. For Japan Japan 53-20944, cl. In 21 of 51/00, published. 1978 8u3A