SU978227A1 - Device for remote control of shaft switching apparatus - Google Patents

Description

(54) CONSTRUCTION FOR DISTANCE MINE MANAGEMENT

By switching devices

one

The invention relates to automation and is intended for use in the automation of production processes in the mining, coal and other industries that are in one way or another associated with work in mines.

A device for remote shunting by mine switching devices over a two-wire communication line is known, which contains a receiving relay connected to the output winding of a supply transformer via a bridge driver, the diode of one of the arms of which is placed at a command point with a common start and stop key 1

The disadvantages of the known device are determined by the complexity of performing the solutions, the significant weight and size indicators of the supply transformer and the absence of any auxiliary control circuits.

The closest in technical essence to the present invention is a device for remote control of mine switching devices, comprising: a relay installed on the secondary side of the supply transformer and connected by a two-wire communication line with an end diode connected at the command point through the closing contact of the start button, The standardized pie3HCTOR, and the disconnecting button of the stop button, the control lamp connected to the secondary winding of the supply transformer

, Q through the interlocking break contact of the control relay 2.

The main disadvantage of this device lies in the low operational reliability due to the spontaneous 5 switching on and off of the receiving relay, respectively, when the supply voltage is lowered and lowered. In addition, the known device does not provide signaling of the state of the switching apparatus,

Claims (2)

20 as well as blocking of remote activation in the presence of a malfunction in the local control and protection equipment located at the command post. In practical use of this device, there are natural hazards and in terms of notifying personnel working in mines about the occurrence of an accident. The purpose of the invention is to increase the reliability of control and expand the functionality of the control device. This goal is achieved by the fact that in a device for remote control of mine switching devices, containing a receiving relay, is installed. on the secondary side of the power supply of the actuator and connected by a two-wire connection to the end diode switched on at the command point through the closing contact of the start button, shunted by a limiting resistor, and the break contact of the stop button, a control lamp, into the power circuit of which a blocking breaking contact is inserted , an additional break contact is made in the start button, through which the control lamp power supply circuit is connected in parallel to the section consisting of an end diode and a replacement end tact of the start button, and one of the free contacts of the local control and protection equipment, located at the command post, was used as the interlocking breaker of the contact. The drawing shows a circuit diagram of the proposed device. properties. In the BXOAHt device, the power supply transformer 1 and the receiving relay 2 are placed at the executive point, two-wire line 3 is the communication, the terminal diode 4 is at the command point, the start button with the opening contact 5 and the closing contact 6 is crossed by a current-limiting (zero protection) resistor 7, a stop button with a softening contact 8, a control lamp 9. In addition, the interlocking break contact 10, which is one of the contact freedom of the local protection equipment, also located on the circuit ndnom njmKxe. The device works as follows. In the initial state, transformer 1 receives a supply voltage from line 3. In this case, at the command post, via the closed disconnecting contact 8, the stop buttons to the communication line 3 are connected in parallel to two chains. The first chain consisting of a current-limiting resistor 7 and an end diode 4 provides the appearance of a constant component of the current link 3. The magnitude of the current in the receiving relay 2, which reacts specifically to the constant component, if there is only the specified chain, is insufficient to draw in the core. However, under these conditions undesirable spontaneous switching on and off of relay 2 can occur, respectively, with increasing and decreasing supply voltage. The second chain, formed by the disconnecting contact 5 of the start button, the warning lamp 9 and the blocking disconnecting contact 10 of the local control and protection equipment, loads the communication line 3 along the variable component of the current. This significantly reduces the constant component and increases the voltage drop across the secondary winding of the transformer 1. In this connection, it provides protection against false switching on current and eliminates the possibility of spontaneous activation of relay 2 when the supply voltage increases. Moreover, prerequisites are created for reducing the resistance of the current-limiting resistor 7 within acceptable limits, which in turn predetermines an increase in the stability of the device when the supply voltage is lowered. The glow of the test lamp 9 indicates that the receiving relay 2 and the controlled switching device are off and, conversely, the absence of luminescence of the lamp 9 makes it possible to conclude that the relay and the device are on. When the start button is pressed, opening the contact 5 removes protection due to the current, and after contact 6 closes, due to the shunting of one half-wave of the supply voltage by the end diode 4, a constant component of the current appears in the connection line 3. Receiver relay 2 triggers and after releasing the start button remains on through current-limiting resistor 7. Simultaneously with switching on relay 2 and correspondingly controlled switching device, the locking contact 10 of the local control and protection equipment opens, leaving this device in the on state. If there is a malfunction in the equipment of local control and protection or directly at the command post, contact 10 will not open and will not allow the controlled device to remain in the on state. For the alert, personnel working in the work stations can use the same link 3 in conjunction with the test lamp 9. In this case, the necessary signals are transmitted periodically. switching on and off the supply voltage. The use of the proposed device will make it possible to increase the stability of the operation of the circuit during voltage fluctuations, and to increase safety when troubleshooting. The invention of the Device for remote control of mine switching devices, comprising a receiving relay installed on the secondary side of the supply transformer and connected by a two-wire communication line to an end diode connected to the command point via a push button start contact, bounded by a current-limiting resistor, and a break contact of the stop button control lamp, in the power supply circuit of which a blocking break contact is inserted, characterized in that, in order to Control and extension of functionality, an additional opening contact is made in the start button, through which the control lamp power supply circuit is connected in parallel to the section consisting of the end diode and the closing button of the start button, and one of the free contacts of the local control equipment is used as an interlock contact. and protection, located at the command post. Sources of information taken into account in the examination 1. The author's certificate of the USSR N 138987, cl. H 01 H 47/32, 1961. 2. USSR author's certificate N 117546 cl. H 02 H 5/04, 1957.