SU952396A1 - Apparatus for diagnostics of continuous rolling mill operation according rolling rate - Google Patents

Description

vym unit whose output is connected. with one-shot, single-shot output. connected to the second input of the first key, the output of which is connected to the first input of the first memory block, the second input of the first adder is connected to the output of the first memory block, and the output of the first adder and the second key, the second input of the second key is connected to the single-shot output of the subsequent stand, and the output to the second input of the memory block, the second input of the second adder is connected to the output of the second memory block, and the output of the second memory block is connected to integral integral controller and the first adder of the subsequent stand 2, the change in the deformation resistance of the rolled metal, caused by fluctuations in its temperature under the action of other factors reducing the effect of temperature, leads to intensive wear of equipment and ultimately to its floor and accidents, to maximum false control effects and, to a decrease in control efficiency. An increase in the temperature of the metal with an increase in the size of the rolling stock, caused by a detuning of the previous stand and fluctuations in tension, causes the SAR to produce contradictory control actions. And on medium section mills, where there is no possibility to measure the cross section of complex profiles, the temperature of profile elements and interlighting forces, control over the mode of operation is difficult. And as a result, there is no accuracy in rolling products (more time to tune when moving from gauge to gauge, when the elastic properties of the roll system change — cage along the roll; after transfer, because of the heating of the rolls / when changing metal grades and heats for which the resistance to deformation fluctuates significantly.The purpose of the invention is the operational control of the operating modes of the paths of continuous analysis of the coronary currents of adjacent stands. This goal is achieved by the fact that it is difficult (diagnosis of continuous operation of the legs (mill in pace rolling,. ..with holding the crust current sensors, increment separation units, threshold elements, adder, additionally contain quadrators, comparison blocks, analysis of the signs of motor current increments, motor current increment analysis block and output block, and the outputs of the core current sensors are connected in series connected increment allocation units with inputs of threshold elements, the output of which are connected to the inputs of the block, and the signs of the increments of the motor currents, and with the inputs of quadrants, the outputs of which are connected to the inputs of the block a loading increments, blocks of drivers through sequentially connected comparison blocks and with an output block through series-connected adder and threshold element, and outputs of blocks of analysis of signs of increments and increments of motor currents are connected to the inputs of the output block. In addition, the output block consists of nine coincidence circuits with three inputs, two of which are connected to the same outputs of the blocks for analyzing the signs of increments and increments of the motor currents, and the third through the threshold element - with the output of the adder. Figure 1 shows the block diagram of the device in figure 2 - possible internal structure of the block of the analysis of signs of increments on fig.Z - the same, the block of analysis of the values of the increments of the currents of the engines; figure 4 - the same, the output unit in the Boolean basis. The device contains three sensors 1 for measuring the current strength of the motors of three adjacent rolling stands. The outputs of the sensors are connected to blocks 2 of the current increments selection / si, L1,2, / 51. The signals generated in blocks 2 are fed to the inputs of quadrants 3 and threshold elements 4. The trigger thresholds of elements 4 are chosen so that they are triggered if the corresponding increments of currents are positive. The quadrature outputs are connected to three comparison units 3, pairwise comparing the levels of the quad output signals and generating signals: X - if the square of current increment i is greater than () the square of current increment i, Xn- if the square of the current increment it is greater than (ui) and Xj- if (di) 1 (. At the same time, the output signals of quadrants 3 are fed to the input of summation unit 6, the output of which is connected to threshold element 7, which is triggered if the current increment of at least one of the motors is different from zero. Threshold outputs. Copies 4 are fed to the input of the unit 8 that performs the analysis of increment signs, and the outputs of the comparison units 5 are connected to block 9, which is JA, the output signals of the motor currents 8 and 9 and the threshold element 7 are fed to the output of block 10., Block 8 generates the following signals:

analysis of increment signs; z - signal for increasing the temperature

z is the detuning signal of the first stand; r1 signal detuning the second stand;

Isolation reduction signal

between the first and second cage; z is the tension increase signal; Zg is a signal for reducing tension in the gap between the second and third stand; Zg - tension increase signal /.

. t

These signals are generated in accordance with the data given in Table 1.

Table 1

five.

four--.

The following truth table corresponds to the logical functions:

i :; f7Tjsi ,, ,,

Block 9 generates signals similar to those of block 8, but unlike the latter, these signals (indicated by two dashes on the block diagram) are obtained by a logical analysis of the values of currents flowing according to the following truth table.2.

Table 2

 X,

 -6-NS x.vx.xjv Vj-,

2; , VXjYX X VX X -,

Claims (2)

1. USSR author's certificate number 555929, cl. B 21 B 37/00, 1977, 2. USSR author's certificate for application number 2906628 / 22-02, cl. B 21 B 37/00, 1980.