| 摘要 |
<p>PURPOSE:To accurately inspect faults in a crossing obstruction detector by emitting light emitters for preset few minutes when no train approaches a crossing, to judge that it is in trouble if light detecting relays for light receivers remain recovered and it is not in trouble if operated, respectively. CONSTITUTION:After a train passes through a crossing, a crossing alarm control relay RPR is operated, an emission control relay DR is operated after preset minutes, light emitters 2-5 are respectively emitted for few minutes, and light detecting relays L1R-L4R for light receivers 6-9 are respectively operated, As a result, after few minutes. emission control relay DR is recovered and fault inspection for one cycle is completed. At this time, if mud or snow deposits occur in front of the light emitters 2-5 and light receivers 6-9 or mutual optical axes are shifted with each other, light detecting relays L1R-L4R are recovered in succession. If the conditions of successive recovery are inspected by illumination, judgement can be made of which one of the light emitters 2-5 and the light receivers 6-9 is in trouble.</p> |
