SU648740A1 - Remote-control device for local airing mine fans - Google Patents

Description

air - with the emitter of a transistor of one of the arms of a self-oscillating multivibrator, while an additional relay is included in the collector circuit of the same transistor, a normally open contact with a normally open starting relay connected to it is connected to a control circuit by a local ventilation starter. The drawing is a functional diagram of a remote control device with a mine fan for local ventilation. The device consists of a sensor 1 controlling the speed of air in the pipeline, a communication line 2, a remote control panel 3 for the operational control of the starter 4 local ventilation fans and the performer. device 5. The actuator 5 consists of a receiver 6 of signals from sensor 1, a power source 7, a time relay 8 for controlling a group device, including the voltage of the dead-end electrical equipment, and also preparing the output power supply circuit through pin 9 of its output relay on the automatic reclosing unit, the automatic reclosing unit is made on the 5az of the self-oscillating multivibrator on the transistors 10 and 11, the key transistor .12 with the starting relay 13, the bridge time setting the DS-c pi on resistors 14-17, capacitor 18 and diode 19. The base of transistor 12 is connected to the driving time by the driving RC circuit, and the collector through the disconnecting contact 20 of the sensor is the 1st emitter of transistor 1 about the self-oscillating: multivibrator, in whose collector circuit is included auxiliary relay 21 .. A contact 22 of an additional relay 21 is connected in series with the contact 23 of the actuator starting re 13, and together they are connected to the intrinsically safe remote control circuit of the actuator 4 through a relay 24 that is not sensitive to alternating current This contact 22 of the auxiliary relay 21 is connected between the earthed core 25 of the remote control circuit of the B1Sh actuator and the auxiliary contact 26 of the actuator 4. In this case, the common contact point 22 of the auxiliary relay 21, contacts 23 of the executive start relay 13 and the auxiliary contact 26 of the actuator 4 connects There is no common point on the Start and Stop buttons of the remote control unit 3. The device operates as follows. Using the Start button remotely; the controller starts the actuator 4, which immediately becomes self-blocking via its block-contact 26. After the normal dead-air ventilation mode is established, the air velocity control sensor 1 outputs a signal to the receiver 2 6 actuators 5. Depending on the type of signal received, the actuator 5 either turns on a group device with a given time delay ,, or in emergency mode automatically turns off the group app atm feeding stall current collectors generation. During normal ventilation, the output relay of the receiver 6 starts the time relay 8, which, after a predetermined time setting (5,10,15, 20 minutes) has elapsed, switches on the group device, and contacts 9 to supply power to the automatic reclosing unit. At the same time, the output relay of the receiver 6 by contact 20 breaks the power supply circuit of the additional relay 21. The starting relay 13 is released during normal aeration, as the capacitor 18 is charged and the main circuit of transistor 12 is de-energized, i.e. transistor 12 is closed. Time relay 8 provides power to the dead-end current collectors with a time delay of 1 min. When the supply voltage is restored within 1 min (short-term power cut-off takes place, for example, when checking the leakage relay), local ventilation fans self-start and the group device is turned on without a time delay of 5, 10, 15, 20 min. It happens as follows. When voltage is applied (after switching off up to 1 min), the automatic reclosing unit receives it through; contact 9 time relay 8 (time delay for releasing the time relay 1 min). The capacitor 18, which, during the short-term absence of the supply voltage, is discharged through diode 19, resistors 15 and 17, will begin to charge. With the charging current of capacitor 18, the key transistor 12 opens with the actuating start relay 13 in the collector circuit, which is activated for a time defined by the time of the master RC-circuit (usually 15-20 seconds). The contact 27 of the relay 13 shunts the contact 9 of the time relay 8 (self-blocking of the power supply of the automatic restarting unit), and the contact 23 turns on the actuator 4. After turning on, the actuator 4 becomes self-locking via the blocking contact 26. Simultaneously with

opening the transistor 12 receives power to the emitter circuit of the transistor 10 of the self-oscillating multivibrator (contact 20 closes after power supply). An additional relay 2 included in the collector circuit of transistor 10 alternately closes and opens its contacts 22 at the switching frequency of the self-oscillating multivibrator, which causes the Stop button and the diode 28 of the remote control 3 to be bridged and released to the AC-sensitive start current 24 of the starter 4 with it same frequency.

After the normal ventilation mode has been reached, contact 20 of the receiver 6 first breaks the power supply circuit of the additional relay 21, and then, after the charging time of the capacitor 18, the base current of the transistor 12 disappears and the starting relay 13 also turns off - the local ventilation fans self-start is over.

The starter 4 is kept in the on state only by self-feeding via the auxiliary contact 26, which does not prevent the implementation / for example, an operational stop using the Stop button of the remote control panel 3, i.e. The task of the operational control of the starter 4 from the remote control panel was solved regardless of the mode of operation of the device.

In emergency mode (ventilation violation), time relay 8 with a time delay of 1 min shuts down the group apparatus, as a result, the supply of voltage to the electrical equipment of the dead-end generation is stopped.

The proposed device will significantly improve the trouble-free and safe operation of electrical equipment of dead-end workings of coal mines, ventilated with the help of local ventilation fans.

Claims (2)

1. Automation for the coal and mining industry Directory Guide, Part 1, M., Informt x mash, 1974, p. nineteen. 2.Kilman A.Sh., Manko A.A. Improving the safety and efficiency of airing blind workings. Coal, 1974, No. 3, pp. 69-70. (HCGG-u U Ju g5 2J yy zt tfff j