SU407273A1 - DEVICE OF REMOTE CONTROL OF A TWO-POSITIONAL OBJECT - Google Patents

Description

one

The invention relates to the field of telemechanics and can be used in systems of remote intrinsically safe control of mine machines and mechanisms.

Remote control devices are known that contain a stabilized transformer and an intermediate relay connected in parallel to the secondary winding of the transformer at the control object, and a button post with an integrated diode at the control point.

The disadvantage of such devices with a two-wire control circuit is the possibility of the spontaneous activation of the actuator during a deregulation of the relay, as well as when changing the parameters of the communication line. In addition, there is no control of the switching on of the control object, since the intermediate relay is self-blocking regardless of whether the object is turned on or not.

The aim of the invention is to improve the reliability of the device and control the inclusion of the control object with a minimum number of wires of the communication line.

To achieve the target, a transmitter is installed on the control unit parallel to the communication line, connected via a magnetic starter contact block, and a receiver mounted on the control point parallel to the communication line connected in parallel from the start and iodine buttons containing a capacitor, resistor, iodine The RC filter and the thyristor, the thyristor control electrode being connected to the resistor of the RC filter connected via a diode to a common connection point of the resistor and capacitor.

FIG. 1 is a schematic diagram of the device; in fig. 2 - Forms of the form NIR.

The device includes a stabilized transformer 1 at the control facility, parallel to the secondary winding of which an intermediate relay 2 is connected, and at the point

The controls are the Start 3 and Stop 4 and Diode 5 buttons connected in series with the Start button.

On the control object, via the blocking contact 6, which is closed when the object is turned on, a transmitter 9 is connected to the terminals 7 and 8, which short-circuits a part of the half-periods of the supply voltage. At the control point parallel to the circuit formed by the Start 3 button and diode 5, a signal receiver is connected, which contains capacitors 10 and 11, resistors 12 and 13, diode 14 and thyristor 15, whose control electrode is connected to resistor 13. The device works as follows

In the initial state, the contact of the Start, 3 button is sodden, the thyristor 15 is closed, and the intermediate relay 2 receives power by a symmetric alternating voltage (Fig. 2a).

Due to the large inductive impedance of the winding, the amount of current flowing through it is not enough to trigger the relay. Managed object turned off. The resistance value of the resistor 12 is chosen such that when the voltage is shaped (Fig. 2a), the voltage drop across it does not exceed the breakdown voltage in the forward direction of diode 14. Consequently, there is no signal at the output of the receiver.

When the Start 3 button is pressed briefly, the positive half-periods of the voltage at the clamp 7 of the line relative to the clamp 8 are short-circuited. Relay 2 begins to receive power from an asymmetrical half-wave voltage (Fig. 26). Under the action of the constant component of this voltage, the current through the winding of the relay 2 increases, which leads to its operation. When activated, the relay issues a command to turn on the control object, the block-contact 6 of which connects the transmitter 9 to the terminals 7 and 8 of the control line, which short-circuits part of the supply voltage half-periods (Fig. 2c).

In the first part of the supply voltage, the capacitor 10 is charged along the circuit: the secondary winding of the stabilized transformer 1, the terminal 8 of the communication line, the resistor 12, the capacitor 10, the Stop 4 button, the terminal 7, the output of the secondary winding of the transformer 1. Constant time The charge circuit of capacitor 10 is small, and in practice the shape of the voltage on its plates is close to the shape of the voltage on the control line.

When the terminals 7 and 8 of the line 9 are closed by the transmitter 9, the voltage on the capacitor 10, which is almost equal to the instantaneous value of the supply voltage at that time, is applied to the resistor 12. At the same time, the capacitor 11 is charged through diode 14, and to the thyristor control transition 15 through the resistor 13 a voltage is applied in the unlocking polarity.

The purpose of the RC filter formed by the capacitor 11 and the resistor 13 is to keep the unlocking potential at the control

the transition of the thyristor 15 until a positive potential appears at the terminal 7 with respect to the terminal 8. Therefore, at the beginning of the positive half-periods of the voltage at the terminal 7 with respect to the terminal 8, the thyristor 15 opens and short-circuits these half-periods. Relay 2 continues to receive power from an asymmetric alternating voltage (Fig. 2c) and remains on.

state regardless of the state of the Start 3 button. If, for any reason, the control object is disconnected, the blocking contact 6 disconnects the transmitter 9 from the control line and the shorting of part of the supply voltage half-cycles stops, the voltage drop across the resistor 12 decreases, the thyristor 15 is locked, relay 2 begins to receive power at a symmetrical voltage and is turned off.

Thus, in the proposed device, the self-blocking of the relay 2 is provided only after the control object is switched on, and the relay continues to receive power with the maximum asymmetric voltage. As a result, the reliability of the device is improved, and it becomes less critical to the parameters and setting of the intermediate relay.

Subject invention

A remote control device for a two-stage object containing

the control object has a stabilized transformer, in parallel with the secondary winding of which an intermediate relay is connected, and on the control point - a start button connected in series with the diode, characterized in that, in order to increase the reliability and simplify the device, in it in the control object parallel to the communication line a transmitter is installed, connected via a magnetic starter contact, and

At the control point, there is a receiver connected in parallel to the circuit from the series-connected Start and Diode buttons, which contains a capacitor, a resistor, a diode, an RC filter and a thyristor, and the control

The thyristor electrode is connected to an RC filter resistor connected through a diode to a common point of connection between the resistor and the capacitor.

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