SU533921A1 - Jet threshold device - Google Patents

Description

one

The invention relates to the field of automatics control and can be used to build metering and software pneumatic devices.

Inkjet counting threshold devices are known, which include an oscillator, a counter, blocks of coincidence, and a setpoint input 1J.

The closest technical solution to the present invention is a device comprising a series-connected jet oscillator, a counter, a decoder and an output switch 2. In order for the device to be in the initial state when powered, all its triggers are made asymmetric. However, such a device, firstly, does not reliably provide a predetermined initial state, since in the process of switching on, in the period before the full supply pressure is set, due to interference from aerodynamic effects, pressure pulses occur in the control channels of the trigger, and secondly, the execution of the triggers asymmetrical makes the two positions of the counting triggers "O and" 1 unequal, which reduces the reliability of the device.

In the proposed device, these disadvantages are eliminated by the fact that it is equipped with a passive pulser, the pulse output of which is connected to the installation inputs of the counter and the output switch, and the other, the inverse output of the pulser is connected to the enable input of the oscillation generator. This allows the use of symmetric triggers, and as a result, the reliability of the device increases.

The drawing shows a schematic diagram of one of the possible variants of the proposed device.

The device contains a controlled oscillation generator 1, a passive pulser 2, a counter 3, a decoder 4 and an output switch 5.

The generator 1 contains an inkjet logic switch b, which performs the function AND / NOT-AND, one of the inputs of which is the enable input 7 of the generator, and the other input through the capacitor 8 and the throttle 9 is connected to its

the output 10. The inverse output of the key 6 is the output 11 of the generator 1. The output 11 is connected to the counting input of the counter 3, performed on the counting triggers 12, 13, 14. The inputs of the trigger 13 and 14 are connected to the decoder 4, made for example on a two-input jet the logical key is NOT OR. The output of the decoder is connected to the control input 15 of the switch 5. This switch can serve as a symmetric jet trigger 16.

The pulsator on the leading edge is made on a non-symmetric jet trigger 17, throttle 18 and capacitor 19. Throttle 18 and capacitor 19 are connected between control channel 20 and trigger output 17 connected to pulse output 21 of pulsator 2. Output 22, inverse to pulse output 21, is connected with the enable input 7 of the generator 1. Pulse output 21 of the pulsator 2 is connected to the channels 23 and 24 of resetting, respectively, the counting triggers 12-14 of the counter 3 and the switch 5.

The device works as follows.

When the supply pressure is applied, the jet in the asymmetrical jet trigger 17 of the pulser 2 is sent to the receiving channel connected to the pulsed output 21 of the pulser. This signal initializes the counting triggers 12-14 of the counter 3, as well as the trigger 16 of the switch 5. The pulse duration of the set pressure signal at the output 21 is determined by the parameters of the throttles 18 and the capacitance 19 in the feedback circuit and is equal to the time pressure set in the control the channel 20 of the jet trigger 17 to the switching level. After the trigger 17 is switched, the pressure at the outlet 21 disappears, and at the exit 22 appears. This signal is fed to the input 7 of the generator 1 and starts the generator. Starting from this moment, at the output 11 of the generator 1, periodic pressure pulses are generated, arriving at the counter 3. The frequency of these pulses is determined by the resistance of the throttle 9, the size of the capacitance 8 and the supply pressure of the jet logic switch 6.

Counter 3 simulates the pulses coming from generator 11, output 11. When dialing some number equal to the specified value (threshold), recorded with decipher 4, the output from the last to control input 15 of output switch 5 receives a signal, under the action of which the output command F is generated at the output of switch 5

According to the diagram presented in the drawing, the trigger threshold set in the defacer 4 is equal to the binary number of the software, i.e., the command F is received after the pulse of the generator pulses.

Other embodiments of the jet threshold device provide for the execution of some of its blocks on equivalent technical means with the appropriate signal type transducers. For example, the output non-switch 5 may be not jet, but pneumatichydraulic or pneumoelectric.

The technical and economic effect from the use of the invention is to increase the reliability of control systems built using inkjet digital devices.

Claims (1)

Invention Formula A jet threshold device containing a series-connected jet oscillator, a counter, a deflector, and an output switch, characterized in that, in order to increase reliability, a passive pulser is installed in it, the pulse output of which is connected to the counter inputs and the output switch, and the inverse output oscillator input. P / P R 15 P J / /  I I I I 7I