| 摘要 |
PURPOSE:To improve the safety by automatically applying an emergency brake instantaneously when a train passes over a speed checking ground piece at a high speed over a check speed set value and by reducing the speed of the train to the speed limit as designated. CONSTITUTION:A ground piece 26 for train detection equivalent to a conventional loop coil is arranged at a specified checking block l away from a ground piece 25 for speed check. When a train of high speed-reducing performance passes over the ground piece 26 at a speed within a range of excessive speeds for emergency braking, a relay HMR35 is hoisted through a zone filter 31 to filter only the frequency 94KHz of this train and is self-held to start the action of timer circuits 40 and 41, while a relay UTMR47 is hoisted. The ground piece 25 thereby reaches the state where the frequency changes from 130KHz is 123KHz in resonance frequency to apply the emergency brake to the passing train, so that when the circuit 40 passes the deadline, a relay 43 is hoisted, the relay 47 is dropped and the ground piece 25 changes the resonance frequency from 123KHz to 130KHz to ring the alarm bell to the passing train. |
