SU1082965A2 - Apparatus for remote control of mine fans for local airing - Google Patents

Abstract

DEVICE OF REMOTE CONTROL OF MINE VENTILATORS OF LOCAL AIR VENTILATION ST. No. 765510, characterized in that, in order to increase the safety of mining operations, it is equipped with additional transistors, a second starting relay, a capacitor, diodes and resistors, the base of the first additional transistor being connected via one resistor to the blocking contact of the actuator of the local ventilator and through another resistor with a positive power supply bus, the emitter of the first additional transistor is connected to pos. power supply bus, and its collector is connected via a diode to the base of the second additional transistor of the resistor and through a resistor to a single capacitor plate, which is also connected via a resistor and a diode to the common output point of the master unit and the master master circuit time automatic pulse switching, through a resistor with the base of the third additional transistor, as well as through a resistor with a negative bus power source, another capacitor plate is connected to the negative bus of the power source and through the resistor with the base of the second additional C S transistor, which is also connected via a resistor to the positive power supply bus, the emitter of the second additional transistor is connected via a diode to the positive power supply bus, and its collector through the second starting relay to the fourth transistor of the fourth transistor whose zmitter is connected to the collector of the third additional transistor, and the base eo is connected via a resistor to the to side of the multivibrator with the output relay of the automatic unit impulse including, the emitter of the third x additional transistor is connected to the negative power source bus cable.

Description

The invention relates to mountainous sawing, in particular, to devices for automatically controlling the amount of air coming to the bottom of a dead-end generation ventilated by local ventilation fans (VMP) in gas and dust hazardous mines and for protective power cuts when the normal ventilation mode is broken. According to the main author. St. No. 765510 is known a remote control device for mine HFMP, containing details of air velocity control, communication line, signal receiver, time master unit, automatic restart unit with time master circuit, transistor multivibrator and transistor switch with starting relay, power source including a rectifier motor, a smoothing filter, a post-current amplifier and a control transistor block-contact starter, resistors, capacitors, diodes and zener diodes, two-transistor switching unit on two transistors Additional RC driver circuits, an additional transistor and a capacitor, the output of the first additional time of an RC driver, connected via an auxiliary contact of the starter to a power source, is connected via a resistor to the base of the additional transistor, the collector of which is connected via an additional capacitor to the input of the transistor switch, and the output of the second additional time of the RC driver circuit connected to the rectifying bridge is connected through a resistor and a zener diode to the base of the first transistor of the switching unit, the collector The op of which is connected via another Zener diode to the base of the second transistor, the emitter-collector junction of which shunts the input of the DC amplifier l. The disadvantage is that the known device in emergency situations, as a result of which the working of the high-voltage automatic switch-off occurs, does not automatically turn on the backup high-voltage magnetic signal and then automatically control its operation, which can lead to gas pollution of the dead-end with a threat to people's lives. At the same time to increase the reliability and. the safety of the VMP control device must not only activate the backup VMP, but also the subsequent automatic control of its operation (implementation of automatic impulse start, automatic restart, switch to the operational VMP during the initial accidental activation of the backup VMP, save the enabled state of the VMP when leaving VMP remote control devices, etc.). The purpose of the invention is to increase the safety of mining operations. The goal is achieved by the fact that the remote control device for the local ventilation shaft fans is equipped with additional transistors, a second starting relay, a capacitor, diodes and resistors, and the base of the first additional transistor is connected through a single resistor with a single contact of the operating VMP starter and through another resistor with a positive The power supply bus emitter of the first additional transistor is connected to the positive power supply bus, and its collector is connected via a diode n with the base of the second additional transistor and through a resistor with a single capacitor plate, which is also connected via a resistor and a diode to the common output point of the time of the master unit and the input time of the RC circuit of the automatic impulse switching unit, through a resistor with the base of the third additional transistor, and also through a resistor with a negative bus transistor: 1 full-power supply, another capacitor plate is connected to the negative power supply bus and through a resistor to the base of the second additional transition The torus, which is also connected through a resistor to the positive power supply bus, the emitter of the second additional transistor is connected via a diode to the positive bus of the power supply, and its collector is connected to the collector of the fourth additional transistor through the second starting relay and the emitter of the third additional transistor the base is connected via a resistor to the multivibrator arm with an output pulley of automatic pulse switching, with the emitter of the third additional trans The resistor is connected to the negative power supply bus. The drawing shows a diagram of the proposed VMP remote control device. The device consists of an air speed sensor 1, a communication line 2 and an executive unit 3 which contains a receiver 4 signals, a time unit 5 for controlling a group device supplying dead-end electrical receivers, a stabilized source 6 meals

block 7 automatic pulsed (re) switching on the VMP, node 8 automatic starting of the VMP, switching block 9 and additional node 10, Block 7 of the automatic pulse switching on VMP made on the basis of a self-oscillating multivibrator on transistors 11 and 12 with an output relay 13 that specifies the duration of the on and off It consists of WB, transistors 14 and 15 with bridge time, which specifies the RC circuit 16, 17, 18, ... 20, 21 with the starting relay 22, which specifies the number of cycles when the pulse starts VMP. Node 8 automatic start VMP contains the time setting RC-circuit 23 and 24, the block contacts 25 and 26 actuators, respectively, working and backup VMP, t-razistor 27, the collector of which through the capacitor 28 is connected to the base of the transistor 15, the diode 29.

Additional node 10 includes transistors 30 and 33, a second starting relay 34 for starting a standby VMP, capacitor 35, diodes 36 and 37, and resistors 38 and 41.

The device works as follows.

The operation of the device begins with the start of the operating HFM by briefly pressing the Start button in the control circuit of its actuator (not shown). In this case, the operating VMP is turned on, in the automatic start node 8, the block contact 25 of the actuator is closed, the transistor 27 is opened through which, by charging the capacitor 28, the transistor 15 opens and turns on the relay 22, the contact of which bypasses the Start button in the control circuit of the operational VMP starter. The collector current of the transistor 15 opens the transistor 14, through which the capacitor 19 begins to charge, the charging current of which of the transistors 14 and 15 is kept open. Simultaneously with the opening of the transistor .15, one side of the multivibrator is energized. The output relay 13, connected to the collector circuit of the transistor 11 of the multivibrator, alternately opens and closes its contacts, shunting the diode in the control circuit of the operating and backup HF starters. After charging the capacitor 19 to the voltage set by the dividers 16 and 20, the diode 18 is unlocked and this charge stops. Transistors 14 and 15 are locked, and capacitor 19 is charged through diode 18, resistor 20 and diode 21. At the time of locking transistor 15, transistor 11 is also locked, causing the relay 13 to turn off, while the VMP starter remains in the on state. Thus, the launch of the VMP continues after the start button is released.

After starting the HFMP and establishing the normal mode of airing the dead-end generation, the sensor 1 is speedy. This air generates a signal in communication line 2, which is fed to the signal receiver. In receiver 4, the output relay trips, affecting the time of master unit 5, which begins to work out a time delay of 5–20 Min (depending on the setpoint). After working out the shutter speed

5 time, the output relay is triggered, including a group device, supplying a dead-end current collector (not shown). If the dead-end ventilation is violated, the signal from sensor 1 stops,

0 which leads to the disconnection of the output relay of the time of the master unit 5 and, accordingly, to the disconnection of the group apparatus.

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The automatic start-up unit 8 provides automatic re-impulse switching on of the high-voltage pulse when the supply voltage is restored within 1-1.5 minutes. When working

0 VMP auxiliary contact 25 and 26 of the starter is closed, the capacitor 23 is charged almost to the voltage of the power source. After disconnecting the supply voltage, the capacitor 23 is discharged

5 through the emitter junction of the transistor 27 and for some time (1-1.5 min) keeps it open. If the supply voltage is restored during the time when

0, the transistor 27 is open, then at the moment the supply voltage is supplied through the open transistor 27 by the charging current of the capacitor 28, the transistor 15 will open, and consequently,

5 and transistors 14 and 11. The capacitor 19 is charged by holding the charging current in the open state of the transistor 15 and after the charge of the capacitor 28 has finished. Thus, in

In this case, an automatic pulse start of the HFM occurs. If the mains voltage is in Vits after 1-1.5 min, then the capacitor 23 will have time to discharge before the voltage

5 below the threshold level and the transistor 27 closes. After the supply voltage is applied, the circuit of the capacitor 28 opens and the automatic start does not occur. You can start the VMP only by pressing

0 Start buttons in the control circuit of the VMP starter. The discharge time of the condensate torus 23 to the threshold level is determined by adjusting the resistance value of the resistor 2 4.

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The switching unit 9 serves to reliably lower the output voltage of a stabilized power source during short-term (for 1c deep drops or disconnections of the supply voltage.

In this case, a fast radar of the capacitor 28 occurs and the restoration of the supply voltage is automatically switched on to the HFM. The additional unit 10 automatically switches on the backup VMP and performs the subsequent automatism (mathematical control of its operation when the operating VMP fails. When the operating VMP is operating, the transistor 30 is open. The positive potential through the open transistor 30 and the diode 37 is applied to the base of the transistor 31 and locks At the same time, the capacitor 35 is charged through the resistor 39 and the transistor 33 is opened through the resistors 39 and 40. In the initial state and during the VMP operation, a positive -potential is applied to the base transis the torus 32 and opens it. During a pulse start, when the transistor 11 is opened, the relay 13 is turned on and, accordingly, the VMP is disconnected to the base of the transistor 32 through the resistor 41 and the open transistors 11 and 15 are applied to the locking potential and the transistor 32 is closed. pause, the blocking contact 25 of the starter opens, the transistor 30 is closed and, accordingly, the transistor 31 opens. To exclude the inclusion of a relay 34 whose contact triggers a backup VMP, the transistor 32 at the time of opening the block-pin Act 25 closes.

When power is removed from the operating high-frequency current or when it is disabled, the actuator contact 25 opens, the transistor 30 closes, and the transistor 31 opens. The discharge current of the capacitor 35 through the resistor 40 and the emitter junction of the transistor 33 for some time (up to 3 s) is kept in the open state, so the relay 34 is turned on at this time and by its contact bridges the Start button in the control of the backup VMP starter

(not shown), which is included in the permanent work. At the same time, in the automatic start node 8, it closes the auxiliary contact 26 of the backup VMP starter and the transistor 27 remains in the open state. If the working HFMP fails during its pulse start, the transition to the standby HFMP will automatically occur, which pulses for the remainder of the start time and goes into operation.

The backup HFM during its pulse start is controlled by the automatic pulse turn-on unit 7. In this case, the transistor 33 is opened through the open transistor 14, the diode 36 and the resistors 38 and 40. The backup VMP stops for the pause time during its pulse start-up by contacting the output relay 1.3 of the cultivator of the block 7, included in the control circuit of the starter. At the initial start-up, in case of an operator’s wrong activation of the Start VMP start button, the device, after the first impulse to activate the backup VMP, automatically pulses the operating VMP. At the same time, in block 8 of the automatic start, the blocking contact 25 of the operating HFMP is closed, in additional node 10 the transistor 30 opens, transistor .31 closes and relay 34 turns off.

With the backup VMP running, in the case of a short-term supply voltage shutdown and its subsequent restoration within 1-1.5 minutes, the automatic start node 8 performs an automatic impulse activation of the backup VMP.

Thus, in emergency situations, as a result of which the working of the HFM is disconnected and the dead-end gas can be gassed, which can create an explosion-fire hazard, the device automatically activates the HFM backup and automatically controls its operation. This will increase the trouble-free and safe operation of the electrical equipment of the dead-end workings of coal mines, ventilated with the help of local ventilating fans.

Claims (1)

DEVICE FOR REMOTE CONTROL OF SHAFT FANS OF LOCAL VENTILATION by ed. St. In 765510, characterized in that, in order to increase the safety of mining operations, it is equipped with additional transistors, a second starting relay, capacitor, diodes and resistors, the base of the first additional transistor connected through one resistor to the contact block of the starter of the working fan for local ventilation and through another resistor with a positive power supply bus, the emitter of the first additional transistor is connected to the positive power supply bus, and its collector is connected to the base through a diode one additional transistor and through a resistor - with one capacitor plate, which is also connected through a resistor and a diode to a common output point of the timing unit and the input of the timing RC circuit of the automatic pulse switching unit, through a resistor with the base of the third additional transistor, and also through a resistor with a negative a power supply bus, the other plate of the capacitor is connected to the negative supply rail through a resistor and to the base of the second additional transistor _to which also alternation <g, the resistor is connected to the positive bus of the power supply, the emitter of the second additional transistor is connected through the diode to the positive bus of the power supply, and its collector through the second start relay to the collector of the fourth additional transistor, the emitter of which is connected to the collector of the third additional transistor, and the base through a resistor it is connected to the arm of the multivibrator with the output relay of the automatic pulse switching unit, while the emitter of the third additional transistor is connected to the negative Yelnia bus power source.