SU1638049A1 - Device for automatic cab-signalling - Google Patents

Abstract

The invention relates to railway automation. The purpose of the invention is to increase reliability. This is achieved by the fact that the thyristors 14 and 15 and the capacitor 17 is a thyristor trigger that supplies power to the decoder 20. 2 Il.

Description

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This invention relates to railway automation, in particular, to automatic locomotive signaling devices.

The purpose of the invention is to increase reliability,

Fig, 1 is given a functional diagram of the device; in fig. 2 is a time diagram of voltages on the elements when receiving signals of the yellow fire code.

The device contains successively connected receiving locomotive coils 1, a band-pass filter 2, an AC amplifier 3, a shaper of 4 rectangular pulses, a single-oscillator 5, the differentiating chains consisting of capacitors 6 and 7 are connected to the direct and inverse outputs of which resistors 8 and 9 and shunt diodes 10 and 11, as well as through limiting resistors 12 and 13, the control electrodes of the thyristors 14 and 15. The anodes of the thyristors 14 and 15 are connected to the positive pole of the power supply 16, and the cathodes are connected between through a switching capacitor 17, they are connected to the negative pole of the power source 16 via resistors 18 and 19 and connected to the inputs of the decoder 20, the outputs of which are connected to the locomotive indicator 21 and the electropneumatic valve 22.

The device works as follows.

The signals of the automatic locomotive signaling of a numerical code at a frequency of 25, 50 or 75 Hz, flowing in rail threads, are induced in the receiving coils 1, are allocated in the band-pass filter 2 and amplified in the amplifier 3. The timing diagrams of the signals at the output of the band-pass filter 2 and amplifier 3 are shown in FIG. 2 (diagrams 1 and 2). The amplified sinusoidal signals from the output of the amplifier 3 are fed to the square wave former 4, the time diagram of the signals at its outputs is shown in FIG. 2 (diagram 3).

Square pulses with a frequency of the signal current are fed to the input of a single vibrator 5, which has direct and inverse outputs, the timing diagrams of the signals of which are shown in FIG. 2 (diagrams 4 and 5). Differential strings are connected to the outputs of the one-shot 5, consisting of capacitors 6 and 8 and resistors 7 and 9, and shunt diodes 10 and 11, respectively, by which the square signals from the outputs of the one-shot are converted into single pointed pulses corresponding to the leading edges code signals. These

the pulses go through the limiting resistors 12 and 13 to the control electrodes of the thyristors 14 and 15, the time diagram of the signals which

FIG. 2 (diagrams 6 and 7).

As can be seen from the diagrams (FIG. 2), during the code pulse, the thyristor 15 opens (diagram 8), and during the code pause, the thyristor 14 (diagram 9) opens. The circuit in thyristors 14 and 15 and the capacitor 17 is a thyristor trigger, the operation of which proceeds as follows. With open thyristor 15, i.e. during a code pulse, through this thyristor and

5, the resistor 18 (and also through the windings of the relay of the decoder 20 connected to this output) the capacitor 17 is charged almost to the full voltage of the power source 16. When the thyristor 15 is opened, i.e. at first

0 the moment of a code pause, the capacitor through this thyristor is connected in parallel with the thyristor 15, and the polarity of the voltage on the capacitor 17 is the reverse of the polarity of the supply voltage.

5 As a result, the thyristor 15 is closed and the charging circuit of the capacitor 17 is switched on through the thyristor 14, the resistor 19 and the windings of the decoder relay 20 connected to this output. Voltage chart

0, the capacitor 17 is shown in FIG. 2 (figure 10).

The signal from the positive pole of the power source 16 through the open thyristor 14 or 15 is fed to

5, the corresponding input of the decoder 20, whose operation does not differ from the known one described in the prototype. The decoder 20 controls the operation of the locomotive indicator 21 and the electropneumatic valve 22

0 enable braking.

Resistors 18 and 19 are necessary in order to exclude the possibility of closing thyristors 14 and 15 when switching the input circuits of the decoder 20.

5 The proposed device can work with the decoder type DKSV-1, does not require changes in its scheme. The device has high reliability, allows to reduce the size s of the power consumption of locomotive locomotive signaling equipment.

Claims (1)

Claims of the invention. An automatic locomotive signaling device, comprising inductor receiving coils installed on the locomotive, the outputs of which through a filter and an amplifier are connected to one and the other inputs of the decoder, one output of which is connected to an indicator, the other to an electropneumatic valve, a capacitor, resistors, differentiating chains and a power source, characterized in that, in order to increase reliability, it is equipped with thyristors connected to the output of the amplifier and connected in series to form ovatelem rectangular pulses and one vibrator, the forward and inverted outputs of the last of which through differentsi0 the chains and one of the resistors are connected to control electrodes of one and the other thyristors, respectively, the anodes of which are connected to the positive pole of the power source, and the cathodes to the one and the other inputs of the decoder, to the one and the other capacitor plates, and through other resistors to the negative power supply pole. Phil.