SU1684148A1 - Crossroad signal unit - Google Patents

Abstract

The invention relates to railway automation, and in particular to devices enclosing the intersection of railways with artificial structures at the same level. The purpose of the invention is to increase reliability. One of the installed sensors 1-8 operates at a certain train speed, in connection with which, through the integrating circuit 9-12, the actuating element 24 is actuated, allowing to ensure the closure of the crossing exactly at the time necessary for the safe entry of railway rolling stock to the crossing, which allows to increase traffic safety and save energy. 3 il.

Description

"Ms

J

about

00

 J

00

The invention relates to railway automation, in particular to warning devices when a train is approaching.

The purpose of the invention is to increase reliability.

FIG. 1 shows a block diagram of the device; in fig. 2 shows the layout of the sensors along the path; in fig. 3 - schematic diagram of the device.

The device contains sensors 1-8, installed along the rail, grouped in two, the first sensors of each group through integrated circuits 9-12 are connected to one of the inputs of elements 13-16 AND-NOT, the outputs of which through the corresponding inverters 17-20 are connected to the inputs element 21 IL AND-NOT, the output of which through the inverter 22 is connected to the input of the trigger 23, the output of which is connected to the actuator 24, the input of which is connected to the output of a single sensor 25,

The device works as follows.

When the train approaches the crossing, if its speed is maximum, it is possible to turn on sensor 2 after sensor 1 with a short time interval. At the same time, the capacitor of the integrating chain 9 will not have time to discharge through its shunt resistor. At both inputs of the logic element 13 there will simultaneously be high-level signals, at the output of the logic element 13 a logical zero is formed, at the output of the inverter 17 there is a logical one, and at the output of the OR-NOT logic element

21 - logical zero, at the output of the inverter

22 is a logical unit. The trigger (23) switches and actuates the actuator 24.

If the train speed is high, the logic element 13 may not turn on, since until the train reaches sensor 2, the capacitor of the integrating circuit 9 will have time to discharge.

Since the sensors 3 and 4 are located closer to each other than the sensors 1 and 2, the logic element 14 will operate and the actuating element 24 will turn on.

At even lower speeds, elements 15 and 16 will work.

Perhaps a very slow passage of the train with stops. To eliminate its follow-up, we introduce an additional single sensor 25.

A device for switching circuits of automatic crossing signaling can be performed, for example, as shown in FIG. 3

The delay time of an integrating high voltage circuit at the input of a logic element depends on the time constant RC, where the R-resistance of the resistor through which it is charged

capacitor and from the resistance of the capacitor shunt resistor.

The speed of the train at which one or another channel of the device stops working is also determined by the distance

between sensors of the same group.

Delay circuits (integrating circuits) were manufactured using KM H 90 capacitors with a capacity of 1.0 microfarad. Resistor resistance, through

which capacitor charges, is 1.2 MΩ. The resistance of shunt resistors is 5.1 MΩ.

Compared with the prototype of the proposed device provides the ability

to speed up the closure of the crossing when a train approaches at high speed, thereby increasing traffic safety, in case of approaching the train moving at low speed to close the crossing later,

which saves energy without reducing traffic safety.

The use of the proposed device leads to a reduction in the time of switching on lamps at night by 10–20 times.

Claims (1)

Invention Formula A device for crossing signaling, which contains track sensors installed along the rails, delay elements, a trigger, the output of which is connected to an executive unit, characterized in that, in order to increase reliability, it is equipped with AND-NOT, OR-NOT elements. inverters and additional track sensors, and the track sensors are grouped in pairs, and the outputs of the first sensors each group through a few items delays are connected to one of the inputs  corresponding elements of NAND, “other the inputs of which are directly connected respectively to the outputs of the second sensors of each group, and the outputs of the elements NAND through the first inverters are connected to the corresponding input of the element ORI, the output of which is through another inverter 5 is connected to the trigger input.