Emergency braking extension device for urban rail vehicle

An emergency braking extension device for urban rail vehicles, comprising:

• an emergency braking extension loop,
• a first emergency braking extension train line, and
• a second emergency braking extension train line;
• wherein
• the emergency braking extension loop is connected to a train power line and located in a lead vehicle of the urban rail vehicles;
• the first emergency braking extension train line and the second emergency braking extension train line run through the urban rail vehicles;
• wherein the emergency braking extension loop has a protective circuit breaker, a first diode, a normally open contact of an emergency braking button and an emergency braking extension relay, wherein the protective circuit breaker, the first diode, the normally open contact of the emergency braking button and the emergency braking extension relay are sequentially connected in series;
• the first emergency braking extension train line is connected between the first diode and the normally open contact of the emergency braking button;
• the second emergency braking extension train line is connected between the normally open contact of the emergency braking button and the emergency braking extension relay;
• a train pantograph control loop is additionally provided with a pantograph lowering control loop;
• a normally open contact of the emergency braking extension relay is connected in series to the pantograph lowering control loop;
• a first normally closed contact of the emergency braking extension relay is connected in series to a return line of a train emergency braking control loop;
• a second normally closed contact of the emergency braking extension relay is connected in series to a power supply negative loop of the train emergency braking control loop;
• a third normally closed contact of the emergency braking extension relay is connected in series to a control loop of a bypass cut-off circuit of a train emergency braking execution loop;
• an emergency braking execution train line is provided in the train emergency braking execution loop;
• a first emergency braking contactors and a second emergency braking contactor are connected in series in the power supply negative loop;
• and
• a normally open contact of the first emergency braking contactor, a normally open contact of the second-emergency braking contactor and the bypass cut-off circuit are connected in parallel, and then the normally open contact of the first emergency braking contactor, the normally open contact of the second emergency braking contactor and the bypass cut-off circuit are connected between a train power supply and the emergency braking execution train line.