CS205708B1 - Connection of the circuit for delayed transfer of the control signal with the discrimination - Google Patents

Description

The invention relates to a circuit for delayed transmission of a control signal with discrimination.

In a number of technological processes, it is necessary to control a technological device located at a certain distance beyond the measuring point on the basis of a certain value measurement. A typical case is the automatic measurement of coal quality on the waistline and the control of the distribution station, several tens of meters away. If the analyzer detects a change in the quality of the coal, it is only necessary to adjust the distribution station when the coal of the changed quality is delivered to it. During this time, which can last from several seconds to tens of seconds, it is necessary to maintain the previous settings of the station, or respond to earlier grains. Therefore, the commands given by the sensor must be transmitted to the actuator with a delay that is ro, free of the ratio of the length of the transport route and the speed of the passport. In this case, it is desirable that the system responds only when the change in the measured value lasts for a minimum period of time and does not respond to random, short-term changes.

A conventional timing relay does not solve this problem because it can only execute one command at a set time and cannot respond to another, while the system must be able to transmit several commands and maintain their order and time spacing. A possible solution would be to use a tape recorder with a separate recording and scanning head and a closed loop tape. However, this solution is relatively complex and is not suitable for heavy-duty operations where mechanical parts would suffer from high failure rates. Requiring the system to respond only when the change takes a minimum amount of time

205 708

The 20S 708 can be met to some extent by the long system time constant, but this introduces an additional signal delay variable that is added to the baseline.

These drawbacks do not have a circuit for delayed transmission of the control signal with discrimination according to the invention, which is that the shift register input is connected to the control signal source and the shift register output to the actuator. A logic member is coupled between the shifting pulse source and the last shift register flip-flop, which is permeable only if the state of the previous shift register flip-flops is the same, with the shifting pulse source directly coupled to the other flip-flops.

This connection can be made of semiconductor components, eg integrated circuits with all the advantages of these components, ie small dimensions, mechanical and thermal resistance, vibration insensitivity, low failure rate, low maintenance and the like. set delay.

The attached drawing schematically shows a circuit for delayed transmission of a control signal with discrimination according to the invention.

An example of a particular embodiment of a circuit for delayed transmission of a control signal, with discrimination according to the invention, is the control of a splitter station at a large excavator that divides coal and tailings into two belt lines. The metering device serving as the control signal source 7 is located on the loading dock of the excavator and the material is delivered to the distribution station, which is the actuator 9, in 10 seconds. The required resolution time is 0.5 seconds, the discriminatory time is 3 seconds.

The circuit is formed by a shift register 1 consisting of flip-flops 2, 3,

4, wherein the shift register input 0 is connected to the control signal source 7 and the shift register output 8 to the actuator 9. Between the shift pulse source 10 and the last shift register 4 flip-flop is a logic member 5, which is leaky only if the state of the previous flip-flop circuits 3 of the shift register χ is the same, to the other flip-flops 2, 3 of the shift register 1 the shifting pulse source 10 is connected directly.

The frequency of the shifting pulses from the source JLO is equal to the inverted value of the resolution time, i.e. 2 s ^-1 , the number of flip-flops 2, J3, 4 of the shift register χ equals the ratio of delay time and resolution. to which the logic element is connected is equal to the ratio of the discriminatory time and the discriminatory time, ie 6.

The control signal from the source 7 controls the state of the first flip-flop _: <2. If the state of the flip-flops 3 is the same, the logic element 5 is leak-free, the shifting pulse also passes to the last flip-flop 4, and the control signal from shift register input 6 appears after 10 seconds at output 8 of shift register 1 If the change of the control signal from the source 7 is less than 3 seconds, the state of the flip-flops 3 is not the same at the moment of the change on the last flip-flop 4, and therefore the logic 5 is leak-proof. .

The circuit of the delayed transmission of the control signal with discrimination according to the invention can be used wherever the device is controlled by a signal from a sensor located on the conveyor path in front of the actuator and where it is desirable to avoid overloading. actuators due to short signal changes, eg in the chemical industry, food industry, in the treatment industry, etc.

Claims (1)

A circuit for delayed transmission of a control signal with discrimination characterized in that the shift register input (6) is connected to the control signal source (7) and the shift register output (8) to the actuator (9) and between. a shift pulse source (10) and the last shift register (4) flip-flop (1) is connected to a logic member (5), which is permeable only if the state of the previous shift register flip-flops (3) is the same with the other flip-flops (2, 3); the shifting pulse source (10) is connected directly.