JPH01138860U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing an example of the arrangement of a train detector and a level crossing obstruction alarm device of a level crossing control device according to this invention, and Fig. 2 shows a main part of an embodiment of this invention applied to the level crossing shown in Fig. 1. A relay circuit diagram showing an example of the configuration of the control circuit, FIG. 3 is a circuit diagram showing another example of the configuration of the portion D in FIG. 2, and FIG. 4 explains the sequence operation of the circuit in FIG. 2 during normal operation. Time chart FIG. 5 is a time chart illustrating an example of the sequence operation when the circuit shown in FIG. 2 fails. FIG. 6 is a graph showing the relationship between fluctuations in the reception level of the track circuit and the trigger level of the relay. In Fig. 1, AT, BT...track circuit, H...
Level crossing, LE ₁ to LE ₃ , LR ₁ to _{LR 3} ...Obstacle detector, OD...Level crossing obstruction alarm device, 3R...Obstacle detection relay, In Fig. 2, ATP...Right direction alarm control relay, BTP...Left Direction alarm control relay, AM...Right direction memory relay, BM...Left direction memory relay, AR...
Right direction control section passage detection relay, BR...Left direction control section passage detection relay, SR...Non-directional control section passage detection relay, _R1 ...Level crossing entry memory relay, R
₂ ...Level crossing detection relay.

Claims (1)

[Scope of Claim for Utility Model Registration] A level crossing control device that controls a level crossing alarm and barrier using the train detection conditions of a train detector composed of a track circuit that detects the presence or absence of a train within a warning section, a self-maintaining level crossing entry memory relay that operates based on the establishment of a logical product condition of a train detection condition from the train detector and an obstacle detection condition from a level crossing obstruction notification device provided at the level crossing; a level crossing passage detection relay that operates and self-maintains when a logical product condition is established between a train absence detection condition from the level crossing obstruction alarm device, an obstacle absence detection condition from the level crossing obstruction notification device, and an operating condition of the level crossing entry memory relay. What is claimed is: 1. A level crossing control device, comprising: a level crossing detection device, wherein a level crossing detection condition of the level crossing detection relay is used as an alarm termination condition.