SU798319A1 - Device for remote control of local airing mine fans - Google Patents

Description

In case of emergency situations, this does not exclude the time delay of 5 ... 20 minutes when supplying the supply voltage to the dead-end production causes additional downtime and loss of working time of the driving crew during the development workings. The purpose of the invention is to expand the functional capabilities of the device. This goal is achieved by the fact that the device is equipped with a blocking unit made in the form of an additional contact block for the local ventilation fan, a transistor switch switching the cascade on two transistors, the time for the giving KS circuit and the transistor, while the additional block is the contact of the valve actuator torus, local ventilation and transistor switch are connected in series and connected between the positive pole of the power source and one of the outputs of the output relay, the time of the driver unit, the second output of the relay It is connected to the base of the first switching transistor, the collector of which is connected to the input of the time of the master Xc circuit connected by its output to the base of the second transistor of the switching stage whose collector circuit is connected to the base of the additional transistor connected between the positive pole of the power supply and the output base transistor time master unit, while the collector of the second transistor switching cascade is connected via a diode to the input time master unit. The drawing shows a schematic diagram of the proposed devices. The device consists of an air speed sensor 1, a communication line 2 and an actuator 3 which contains a receiver 4 signals from the sensor, an automatic re-on unit 5, a power source and a driving time. 7 to control a group apparatus feeding dead-end current collectors. The time setting device consists of the clock generator 8, the main threshold stage 9 and the blocking node 10. The clock generator 8 is made on the basis of a self-oscillating meltivibrator with an output gear included in the load circuit of the output transistor. The main threshold cascade 9 contains a standby multivibrator with an executive relay 11, included in the load circuit of the output transistor 12, an additional threshold element 13, the timing of the driving capacitor 14 and the output transistor 15, contact 16 of the output relay of the receiver 4 of the signal. The node 10 of the block -... contains a block 17 of the VMP actuator and the key transistor 18 included in the output transistor circuit of the main threshold stage, switching cascade on transistors 19 and 20, time setting the KS circuit 21, 22, auxiliary transistor 23, resistors 24, 25, 26 and diodes 27 and 28. The device works as follows. ; After starting the HFMP and establishing the normal mode of airing the dead-end production, the air velocity control sensor 1 outputs to the communication line 2 a signal that enters the receiver 4 signals of the actuator 3. In the 4 signal receiver, an output relay is activated, one contact of which starts the time master unit 7, and pin 16 prepares the switching circuit of the executive relay 11. Time the master device begins to work out the time delay 5 ... 20 min (depending on the setpoint). After working off the time delay during the timing device, an executive relay 11 is switched on including the group device. If the dead-end ventilation is violated, the signal from the sensor to the actuator is stopped. In the signal receiver 4, the output relay is turned off with a time delay of 0.5., ..2 minutes. Upon expiration of this time delay, the actuating relay 11 is disconnected, which disconnects the grouped device, which supplies the dead-end current collectors. The blocking unit for switching on the group device excludes a time delay of 5 ... 20 minutes for supplying power to the dead-end generation when the supply voltage is removed and then restored within 0, 5 ... 2 minutes. The operation of the blocking block is as follows. In the initial state, contacts 16 and 17 are open, transistors 12 and 19 are open until saturation, and transistors 20 and 23 are locked. Transistor 19 is open across the power supply's PLC circuit. Resistor 24-emitter junction. Transistor 19 - diode 27 - minus the power input. Capacitor 22 is discharged at this time. After the impulse start of the VMP is performed by the automatic reclosing unit 5, the VMP starter turns on and closes its block contact 17. The contact 16 starts to flash after the normal ventilation mode of the dead end is set and the output relay of the 4 signals is turned on. At the same time, another time of the output relay of the signal receiver 4 triggers the timing of the driver unit 7 and its output transistor 12 is locked.

The transistor 15 is in the locked state until the threshold level at the capacitor 14 is reached. Therefore, the transistor 19 remains in the open state.

After working off the time delay of 5 ... 10 min, transistors 12 and 15 are opened, and transistor 19 is closed, as its base circuit is shunted by the open transistors 12 and 15. Capacitor 22 is charged along the circuit plus power supply resistors 25, 2b-capacitor 22 - minus power source. The charge of capacitor 22 occurs relatively quickly, since the total resistance of resistors 25 and 26 is small.

The voltage on the capacitor 22, having increased to a certain level, leads to unlocking of the transistors 20 and 23. The collector current of the transistor 23 keeps the transistor 15 in the open state after the discharge of the capacitor 14.

When the transistor 20 is unlocked, the diode 28, the shunt input of the main threshold stage, is unlocked.

The disconnection of the VMP actuator leads to the opening of its - block - contact 17 and the shutdown without time delay of the executive relay 11 and the group apparatus.

If the dead-end generation airing is interrupted for time less than 0.5..2 minutes, the contact 16 of the output relay of the receiver 4 signals remains closed (due to a time delay of 0.5 ... 2 minutes to turn off the output relay of the receiver 4 signals), therefore the relay 11 stays on. If the dead-end airing is violated for a time longer than 0.5 ... 2 minutes, the output relay of the signal receiver is turned off, contact 16 is open, the relay 11 is turned off, and the group device is turned off. Transistor 19 is unlocked and quickly discharges through its collector circuit capacitor 22 Transistors 20.23 and 15 are locked and the circuit returns to its original state.

As a result of this, after the restoration of normal airing of the dead-end production, the permission to activate the group apparatus is issued with an exposure time of 5 ... 2 minutes.

When the supply voltage is disconnected, the capacitor 22 with its discharge current through the resistor 21, the emitter junction of the transistor 20 and the diode 27. Supports the transistor 20 in the on state. The transistor 19 is locked at this time and the discharge of the capacitor 22 occurs only through the resistor 21, the time delay for locking the transistor 20 created by

the discharge current of the capacitor 22, is more than 2 min.

If the power supply voltage recovery occurs within 0, 5 ... 2 minutes, the output relay of the receiver 4 signals turns on immediately with the supply voltage and closes its contact 16. As the transistors 20 and 23 are open, the transistor also opens 15 collector current of the transistor 23.

0

Simultaneously with the closure of the contact 16, the other contact of the output relay of the receiver 4 signals also closes, the starting time of the driver unit 7 starts. However, it does not start because the input of the driver time is shared with the power supply through the open transistor 0 and diode 28. Transistor 12 remains open and relays

0 11 is turned on after the termination of the pulse start of the HFMP and unlocking of the transistor 18. The transistor 18 is open all the time during operation. It closes at the time of the pulse. launch VMP,

5 in order to disconnect the relay 11 from the power supply circuit for the start time, since otherwise the relay 11 and the group device supplying the dead-end current collectors are turned on and off by the auxiliary contact 17 of the actuator

 VMP in time with triggering and tripping pulses. After the pulse starts, transistor 18 opens.

If the recovery voltage

5, the mains supply occurs for a time longer than 0.5 ... 2 minutes, contact 16 is opened, transistor 19 opens and discharges capacitor 22. This causes the transistors to be locked

0 20, 23 and 15. After starting vmp and

establishing a normal dead-end ventilation mode, turns on the output relay of the signal receiver 4 and closes its contact 16,

f block contact 17 starter closed. Since the transistor 20 is locked and does not bypass the input of the time of the driver unit 7, the time of the driver unit 7 starts up and turning on the relay 11 and issuing permission to turn on the group device

0 is produced with a time delay of 5. , .20 minutes.

Thus, with the restoration of the supply voltage and the normal ventilation of the dead-end production

5 for 0.5 ... 2 min. The time delay for switching on the group 5 ... 20 min is automatically excluded. If this time exceeds 0/5 ... 2 minutes, then permission to issue a group of new devices is issued with a time delay of 5 ... 2 minutes.

The implementation of the invention permits. Due to the exclusion of time delay for the inclusion of the group apparatus at 5 recovery within 0.5 ... 2 minutes

supply voltage and normal dead-end airing to reduce downtime for preparatory workings of 1 minimum for 10 minutes per shift.

Claims (3)

1. Automation tools for 0 coal and mining industry. Catalog - directory, Part 1. Informt Zhmash, M., 1974, p. nineteen. 2. USSR author's certificate for application number 2302838/03, 5 cl. E 21 P 1/00, 1975. 3.ABjopcKoe certificate of the USSR for the application number 2673384/03, cl. E 21 P 1/00, 11.10.78 (prototype).