SU554530A1 - The system of regulation of the ratio of technological processes - Google Patents

Description

one

The invention relates to digital systems for the automatic adjustment of the ratio of parameters and can be used in continuous mixing systems for liquid, gaseous, or bulk materials whose flow rate signal is represented in a pulse number code.

There are known control systems for the relation of the parameters of technological processes, which contain serially connected command blocks, a control unit, the first output of which is connected to the executive bodies, and the second is connected through the serially connected performance controller and the blocking device is connected to the input of the comparator unit, the outputs of which through the corresponding regulators connected to the executive bodies, and through series-connected scheme "OR and the control scheme for the total error - to the inputs b eye control and locking devices, and n control channels, each of which comprises a counter whose input is connected to the sensor actuator body.

However, the known systems have insufficient accuracy of regulation.

The aim of the invention is to improve the accuracy of regulation.

The goal is achieved by the fact that the system contains a counter and a serially connected register and a key block whose output is connected to a control unit and a blocking device, whose output is connected via a counter to the control input of the key block, and the serially connected register and interpol are entered into each control channel a torus, the output of which is connected to the corresponding input of the comparator unit, and its other input is connected to the counter, the inputs of the registers are connected to the command issuing unit, the outputs of the regulators through the OR circuit lyucheny to the input of the set point performance.

The imp is a block diagram of the proposed system.

It contains block 1 issuing commands; control unit 2, setpoint adjuster 3,

interlocking device 4, comparison unit 5, executive units 6, electronic counters 7 and 8, registers 9 and 10, interpolators 11, electronic counters 12 and 13 of direct counting, triggers 14 — the last bit of counters 12, 13, coincidence circuit 15 , a reset pulse formation circuit 16, astatic regulators 17 with parallel direct communication, electropneumatic converters 18, regulating pneumatic valves 19, volumetric flow meters with pulse output 20, transfer pumps 21, common mixing manifold (circuit) 22, OR 23 and logic circuits 24, control circuit 25 of the total error and the block 26 keys. The operation of the system is as follows. With the command issuing unit, a program for offsetting to registers 9 and 10 is recorded. In register 9, the scale of the percentage of dialed dose is entered, which is set depending on the quantitative ratio of the components. The number recorded in regenstra 9 means that, depending on the selected dose range of the finished mixture, the unit 3 was given the command to give the total number of pulses, which is conventionally taken as 100% of the prepared dose. As soon as the counter 8 gains this number of pulses from the setpoint 3 through the open blocking device 4, the signal through the corresponding public key of the block 26 enters the lockout device 4 and the control block 2, which causes the system to stop as well as turn off the setter 3. As a unit for issuing command 1, either a manual setter or an electronic computer (which, in addition to calculating the setpoint and writing it to registers 9 and 10), calculates the optimal recipe for additional tasks such as Example as the calculation of optimum gains, low cost, low consumption of expensive components, and so on. n.), or may be taken both of these devices simultaneously. After recording in registers 9 and 10 of the Program, the command issued to the control unit 2 receives the command "Task issued simultaneously with the program recording in registers 9 and 10. Block 2 automatically performs the necessary operations in a flow chart according to a certain command Such as, for example, choosing the right pumps, opening certain electric jets to connect the required components to the mixing system and sending the finished mixture to the consumer. After all preparatory operations have been completed in control unit 2, a start signal is generated, which is a command to start the system into operation. After starting the command with the control unit, pumps 21 are turned on, which feed the components into an offset. At the same time, power is supplied to the setpoint adjuster 3, from the output of which pulses begin to flow through the open blocking device 4 into an 8 percent dose counter and a counter 12 of the comparison unit 5. The number of pulses in the counter 12 is converted to analog form and fed to the left input of the 17 regulators of all channels . This signal through regulators 17 and electropneumatic converters 18 enters the regulating valves 19, opening them. In pipelines, flows of components occur, the flow rate data of which in the pulse code using sensors 20 begin to flow to the input of counters 7, where the integral value of the flow of components is recorded. At the same time, the pulses from the outputs of the first bits of these counters through the interpolators arrive at the input of the counters 13 of the comparison unit. The recorded number in counter 13 is converted to analog form with the help of weight resistors. The analog signal is removed from the summing resistor and fed to the second input of the regulator 17 of this channel, thus closing the negative feedback. The regulator 17 is affected by the difference of two signals - from counter 12 and counter 13, which is reduced to zero. As the meters 12 and 13 are filled, there comes a time when the last bit is turned on (i.e., the meters are 50% full) and the rest of the meters 12 and 13 starts to fill up again. As soon as all the potentials coincide at the inputs of the coincidence circuit 15, a signal comes from its output to the input of the circuit 16. Scheme 16 will give an impulse normalizing triggers 14 in “O. At the same time, the same number is subtracted from all counters — 50% of their capacity. This eliminates the overflow of counters 12 and 13 and at the same time does not change the difference in recorded pulses that exists between them. This difference, which is the integral of the error, can be either positive or negative. The presence of a series-connected astatic controller 17 imparts a second-order astatism to each control channel, which ensures high control accuracy. The regulating voltage from the regulators 17 is also fed to the input of the "OR 23" circuits, performing negative feedback on performance, the use of which allows the displacement process to be at its maximum performance, regardless of the ratio being set, and on the effect of any other external disturbing factors. . Circuit 25 is triggered if the difference in numbers (which is the same for analogous voltages) in meter 12 and meters 13 (which is the total error) exceeds the permissible level, i.e. circuit 22 is threshold device. The trigger threshold (tolerable error level) is set specifically at the site when the system is implemented. When the circuit 25 is triggered, a signal is issued to shut down the system, since it is considered that such a fault level is caused only by some malfunction (breakdown, absence of a component, etc.).

Claims (2)

1. A process control ratio control system comprising a series-connected command issuing unit, a control unit, the first output of which is connected to the executive bodies, and the second through the serially connected performance controller and the blocking device connected to the input of the comparison unit, the outputs of which through the corresponding regulators connected to the executive bodies, and through series-connected “OR” circuit and the control circuit for the total error - to the inputs of the control unit laziness and blocking devices, and n control channels, each of which contains a counter, the input of which is connected to the sensor of the executive body. characterized in that, in order to improve the accuracy of regulation of the system, it contains a counter and serially connected register and key block, the output of which is connected to the control unit and blocking device, the output of which through the counter is connected to the control input of the key block and to each channel regulators introduced in series a register and an interpolator, the output of which is connected to the corresponding input of the comparator unit, and its other input to the counter, the inputs of the registers are connected to the command issuing unit. 2. The system according to claim 1, characterized in that the outputs of the regulators through the circuit "OR connected to the input of the setpoint controller.