SU399575A1 - DEVICE FOR CONTROL OF MIDDLE VALUE OF CURRENT SERIES OF ALUMINUM ELECTROLISERS - Google Patents

Description

one

The invention relates to metallurgy, namely the electrolysis of aluminum. It can also be used in other metallurgical industries where it is necessary to maintain an average current, such as the electrolysis of copper, nickel, etc., as well as during electroplating, charging batteries, etc.

A device is known for monitoring the average current value of a series of aluminum electrolysis cells, comprising a kiloampere-hour meter and an instrument for setting the current of the series.

The proposed device allows continuous automatic monitoring of the kiloampere series and, if deviations from the permissible value occur, produce the appropriate signal. To do this, it is equipped with a reversible counter with a display unit, a sign trigger and switching valves on the meter inlet and outlet, and the outputs of the meter’s current-kilometer-ampere meter and the setpoint device are connected to the sign trigger trigger through the inlet valves connected to the forward and reverse spikes of the reversible counter , and the outputs of the counter, fixing its zero and one states, are connected to the inputs of the output gates, the second inputs of which are connected to the reverse counting counter of the reversible counter, and the outputs to the seed shoots EPA sign.

The drawing shows a block diagram of the proposed device.

It consists of a 1 kilo-ampere current meter of a series with a pulse output, the pulse frequency at the output of which is proportional to the current of the series, a current setpoint 2 of the series with a pulse output, a reversing counter 3, input gates 4-7, a trigger of a sign 8 with indication of a deviation indication unit 9 series kiloamner hours, setpoint adjuster 10 permissible deviations of series kiloamper hours, comparison circuit 11, output gates 12 and 13 switch the sign trigger, counter overflow valve 14, output gates 15 and 16 turn on the overflow triggers and triggers 17 and 18 overflow counter with ipdikatsnya. Device is working

in the following way. At the start of operation of the device, the trigger of sign 8 is in the zero position, with the fan 4 and b being prepared, and the valves 5 and 7 are locked. Therefore, the pulses from the output of the 1 kiloampere counter of the series are fed to the input of the direct count (sum) of the reversible counter 3, and the impulses from the setting device 2 of the series to the counting input (subtraction). With an increase in the value of the current of the series, the pulses of the amphibious hours arrive: 3 times and the content of the counter 3 increases. When the current of the series decreases, the kiloampere hour emuls are less frequent and the content of the counter 3 decreases. This will continue until the counter is set to position 0000. Another impulse received at the counter subtracting input passes through the node. The blind valve 13, whose input is connected to the output that fixes the zero state of the counter (0000), sets the count to 0001 and switches the Zpak trigger to position 1. The imbalance between the kiloampere series and the installed one becomes negative. The outputs of the trigger for the sign of the number switch the inputs of the recirculating counter by closing the veins (hole 4 and b and opening the valves 5 and 7. If the ratio between the serc current and the specified average value does not change, the series kiloampere hour pulses will receive more rarely than The device for setting the average current of the series, but now to the subtracting input of the counter. As a result, the negative unbalance will begin to increase. i If the current of the series becomes greater than the specified average value, the pulses of ampere hours of the series end, If a negative imbalance is applied to the subtracting input of the counter, it will start to arrive more often, causing the contents of the counter to diminish. This will continue until the counter is set to position 0001. The next impulse received to the subtracting input of the beneficiary passes through gate 12, but the reference connected to the output (by fixing the single state of the counter, ri switches the trigger to the O position, and the counter itself is set to position 0. If the ratio between the currents Hte changes, the pulses iloamperchasov series will nostupat to a summing input of the counter, thereby increasing the positive imbalance. If the imbalance reaches the full capacity of the counter, i.e. there are units in all bits, the next impulse received to the totalizing input of the counter passes through the gate 14 and one of the gates (15 or 16) depending on the sign of the imbalance and switches the corresponding trigger overflow (17 or 18). In this case, the counter and the zpak trigger are reset to 0. The contents of the counter are induced by the display unit, however, it is undesirable to make a direct connection, since a permanent change in the information will tire the operator. Therefore, it is advisable to transfer the ipformatization synchronously with the arrival of emulsions on one of the counter inputs, which summarizes. For this, the display device must have a special input for receiving information from a reversible counter. In addition, a constant change in information can be eliminated by reducing the impulses coming from the kiloampere counter and from the setter to two sequences of pulses shifted by time insufficient for separate perception, i.e., the time is no more than 1/10: 1 / 16 sec Since for the correct operation of the reversible counter, it is necessary to synchronize the impulses not arriving at its inputs so that they do not coincide in time, i.e. it requires either introducing additional synchronization circuits, or assigning these functions to the sensors of the kiloamperchas and the setting device, The second path may be more appropriate. The subject of the invention 1. A device for monitoring among the current values of a series of aluminum electrolysis cells, containing a kiloampere counter and a device for setting up a current of a series, characterized in that, in order to automate the monitoring process, it is equipped with an additional reversible counter with a display unit, a trigger, and switching valves at the input and output of the meter, the meter outputs of the meter kiloampere current of the series and the setpoint gauge device are connected to the forward and backward buses via the input valves controlled by the sign trigger and the reversing of the counter, and the outputs of the counter, fixing its zero and one states, are connected to the inputs of the output valves, the second inputs of which are connected to the reverse-count bus of the reversing counter, and the outputs to the inputs of the sign trigger. 2. The device of claim 1, characterized in that, in order to increase the stability of the indications of the display unit, the latter is made with an internal memory and has an input for receiving a code that is connected to one of the buses of the reversible counter. 3. Device but p. I, characterized in that, with the possibility of automatically fixing the moment of exceeding the allowable imbalance, it is equipped with a unit for permissible deviation of kiloampere series and a comparison circuit, and the discharge bits of the counter are connected to the inputs of the comparison circuit, the second inputs of which are connectors with the unit for permissible deviation of the kiloamner hours of the series, and the signal on the output of the comparison circuit is a signal for reaching the permissible error. 4. The device according to claim 1, characterized in that, in order to automatically fix the overflow factor of the counter, it is equipped with overflow riggers with indication, the inputs of which are connected to the outputs of two venules, the potential inputs of which are connected to the trigger of the sign, and the pulse outputs - with the output of the valve nerenoliepi, one of which is connected to the output of the counter, which is filling it, and the other with the receiving account bus. Indication unbalance sign Indication counter overflow.