CS260161B1 - Connection to electronic control of pneumatic circuits - Google Patents

Abstract

The electronic control circuit for pneumatic circuits is designed to control pneumatic circuits used in explosive environments. The essence of the solution is that pneumatic-electric switches sense pressures in pneumatic circuits, which are evaluated in a microelectric logic circuit and signaled using optoelectric signaling elements. The entire electronic circuit is powered by an intrinsically safe source.

Description

BACKGROUND OF THE INVENTION The invention relates to a connection for electronic control of pneumatic circuits.

So far known devices for controlling pneumatic logic or control circuits used mainly in explosive environments are solved by means of pneumatic-mechanical pointing and pneumatic-logic devices. The disadvantage of controlling pneumatic circuits with such devices is that they are expensive and bulky-tolerant devices, unsuitable for aggressive and dusty environments, and cannot create more complex logic functions with them.

The above mentioned drawbacks are eliminated by the connection to the electrical inspection of pneumatic actuators in that pneumatic-electric switches are incorporated into the controlled pneumatic circuits, which are the pressures in the pneumatic circuits. The contacts of these switches are coupled to the p and signaled by the optoelectric signaling diodes connected to the outputs of the microelectronic logic circuit are the controlled pneumatic circuits. The entire electrical control circuit of the pneumatic circuits is powered by a spark-safe source.

The main advantage of engaging in electronic control of pneumatic circuits is that it can be used to control pneumatic circuits in potentially explosive atmospheres, while the miniature miniature device is also suitable for heavy operating conditions.

The drawing shows a circuit diagram for the electronic control of pneumatic circuits according to the invention.

Pneumatic-electric switches 1 are incorporated into the controlled pneumatic circuits 2, the outputs of which are connected by a circuit 3, the outputs of which are connected to the optoelectric signaling elements 4, and the entire electronic circuit is powered from the spark-safe source 5 ·

Pneumatic-electric switches 1 are in the controlled pneumatic circuits log 1 and log 0 such that these levels are expressed by closed or open contacts. The contacts of the switches are connected to the inputs of the microelectronic logic circuit 3 in which, according to the selected logic function, these are processed and the opto-circuit signaled from the logic circuit is made of Istrian security elements, which can work with signal levels withdrawn from the spark-safe power supply 5.

The subject matter of the invention can be used in all pneumatic devices that use the pneumo-mecbanic control devices log 1 and log 0, and their use in large numbers. It can also be used in aggressive and dusty environments, in devices with shocks, and wherever there is a prior art mechanical-mechanical control device equipped with fine mechanics, it is not possible to use it.

By using the microelectronic logic circuit, it is possible to generate from the input data any function and to signal this by optoelectric elements.

Claims (1)

SUBJECT Circuit for electronic control of pneumatic circuits, characterized in that at least two controlled pneumatic circuits (2) have built-in pneumatic-electric switches (1) whose outputs are connected to inputs of microelectronic logic circuit (3J, outputs of which are connected to optoelectric signaling elements (4) and the whole electronic circuit is powered by an intrinsically safe source (5).