JPS5830864A - Non-alarm preventive circuit for railroad crossing safety device in single track section - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit for preventing a no-alarm or no-shutdown state caused by a fault in a track circuit that controls the device in a level crossing safety device for single-track sections. The purpose is to contribute to improving security.

Level crossing safety device for single track sections of train tracks.

For example, a method of automatically controlling a safety device such as an alarm AL or a barrier G installed at a level crossing H that intersects with a single-track track T as schematically shown in FIG. 1 is as follows: A track circuit OT of the required length centered on the zero point of the track T that intersects with the level crossing H, and a track circuit AT that continues to the left and right of the track T,
It constitutes BT, supplies current to each track circuit, and connects each track relay OTR, ATR, and BTR (none of which are shown).
This is a method in which the track relay is operated and controlled on the condition that the track relay is restored when a train enters any track circuit.

Figure 2 shows seven examples of conventional control logic circuits based on the above control method shown in Figure 1. AEIR is a memory relay for right direction operation of the train when the train enters the track circuit AT;
SR is a memory relay for left direction operation of the train when the train enters the track circuit BT.

OR is a control relay for the safety device, and when it is restored, it drives alarm AL, circuit breaker G, and other devices.

This action causes the device to stop driving. In addition, the contacts ATR and BTR inserted in the control circuits of the memory relays ASR and BSR and the control relay OR are the first
These are the contacts of the track relay ATR and BTR, which are not shown in the figure, and the contacts ASR and BSR are the memory relay 7ASR,
, BaR contacts. Also, the contact symbol is shown with the same symbol as the relay to which it belongs).

It is assumed that each track circuit in FIG. 1 is constituted by a non-insulated track circuit.

Next, as a premise for explaining the present invention, an outline of the operation of the conventional control logic circuit shown in FIG. 2 will be explained.

First, when a train is not approaching level crossing H in Figure 1, that is, when a train is not approaching any of the track circuits AT, OT, and BT, track relays ATR and OTR are activated.
, BTR are all in operation, so both storage relays A8RBSR in FIG. 2 have their excitation circuits cut off and are in the recovery state, and control relay OR, which is included in its excitation circuit, is in the operating state. Therefore, the operation of the safety device at the level crossing H is stopped.

When one train enters the track circuit AT from the left direction point, the track relay ATR is restored and the restoration contact A is activated.
The storage relay ASR is operated by the configuration of the excitation circuit via TR and recovery contact BSR.

Furthermore, when the track relay ATR is restored, the control relay OR disconnects the excitation circuit and is restored, driving the safety device and starting to warn or shut off the level crossing. When the train advances further and steps on track circuit OT and straddles track circuits AT and BT, track relays OTR and BTR are restored, and the self-holding circuit of memory relay ASH is activated via recovery contact BTR and operation contact ASR. configured.

Therefore, one train passes through the track circuit AT and is connected to the track relay AT.
Even if R operates, the operation of relay ASR is maintained. When the train advances and passes the track circuit OT, the track relay OTR is activated, and the control relay OR is activated by the excitation circuit via its contacts and operating contacts ATR and ASR to reset the safety device. During this time, the operating conditions of the left direction driving memory relay BSH are not configured at all, so the relay BS
R remains in the recovery state.

However, in the above operation, if a fault occurs in the track circuit BT during which one train is entering, for example, a voltage drop in the track circuit due to rain, the track relay BTR will be restored even after the first train leaves the track circuit BT. Since the state remains the same, the self-holding circuit of the memory relay ASH in FIG. 2, that is, the excitation circuit via the recovery contact BTR' and its own operating contact ASR, is not reset, and the relay ASR continues to operate. Next, even when a train traveling from right to left approaches the level crossing H and enters the track circuit BT, the control relay OR remains energized and operated by the control circuit via the operating contacts OTR, ATR, and ASR. Therefore, the safety system at level crossing H is not activated, resulting in no warning and no shutoff.

This also applies to the left direction driving memory relay BSR, and the control circuit shown in FIG. 2 has an extremely dangerous drawback.

The present invention constitutes a timing circuit that is used before and after a train passes a railroad crossing, and depending on the timing conditions, for example, a train proceeding to the right from point L on the track T in FIG.
The above-mentioned memory relay ASR is forcibly restored at the point R, and the memory relay BSR is forcibly restored at the left-hand point of the track circuit AT in the case of a train proceeding leftward from the R point. This eliminates the drawbacks of

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 3 shows memory relays ASR and B'S, respectively, based on coincidence outputs RR and LR of the timekeeping circuit, seven examples of which are shown in Figure 9.
An example of a circuit that forcibly restores R.

Restoration contacts RR and LR are inserted into the excitation circuit of memory relay ASR2BSR shown in Fig. 2, and the respective excitation circuits are cut off by the respective operations of coincidence output relays RR and LR, thereby restoring memory relay AEIR and BBR. .

In Figure 9, the time before and after a train passes a level crossing is measured, and after passing the level crossing, for example, the timing of passing point R or L in Figure 1 is measured and the recovery control of the memory relay ASR or BSR is performed. This is a circuit that generates a time measurement output. That is, the time setting unit TA in FIG. 1(A) sets the recovery conditions for the track relays ATR and OTR, in other words, the clock pulse cp (however an adding unit Aa that counts the clock pulse generation source (not shown) and measures the time Ta;
Then, this time 'ra is multiplied by the length of the track circuits AT and BT, the trout ratio BA/p, and e, and then the required margin time 1, for example, a time αt of about 10 seconds is added (
A multiplication unit Am that generates an output a for a set time length of Ta
It is composed of.

The timing section To also determines the operating conditions of the output relay R1 and the track relay OTH as shown in FIG. The counting of clock pulses cp is started by the operation of the control relay ISR which operates on the condition that the signal passes, and its timing output is compared with the setting output a of the setting section TA in the comparator AO, and when the time lengths of both coincide,
The output of comparator AO operates coincidence output relay RR.

Similarly, the time setting unit TB in FIG. 9(A) counts clock pulses cp during the recovery condition of the track relays BTR and OTR, that is, from when the train enters the track circuit BT until it exits the track circuit OT. Addition unit B that measures time Tb
a and the output d with the set time length of (Tbxu/B4+βt)
and a multiplier Bm that generates the output relay L1 and drives the output relay L1. In addition, the timing section To in this case is shown in the same figure (
A control relay S driven by the operating conditions of the output relay L and the operating condition of the orbital relay OTH shown in B).
The counting of clock pulses cp is started by the operation of R, and the counting output C is sent to the time setting section TB in the comparator BO.
is compared with the set output d of 1, and when the time lengths of both match, the coincidence output relay LR is operated according to the output of the comparator BO.

The functions of the circuit shown in FIG. 9 have been described above. Next, an outline of the circuit operation accompanying the movement of the train will be described, mainly in the case where the train moves from left to right.

When one train enters the track circuit/T on the track T in Figure 1, the track relay ATR is restored and the 9th train enters the track circuit/T.
The addition section Aa of the time setting section TA in Figure (A) is the recovery contact AT.
Counting of clock pulses cp is started via R and continues until the recovery contact OTH is opened, that is, the train passes the level crossing and the drive relay OTR is activated. The measurement time Ta obtained by counting these clock pulses is multiplied by the ratio M/station of the track circuit length in the 1 multiplier Am, and the time output a is generated in the set time length by adding the margin time αt. , drives output relay R,.

This time length (Ta x BI3 / A-13 + αt)
assumes that there is little change in train speed before and after passing the level crossing.

This is set in advance as the length of time from when the train passes the railroad crossing until it passes point R. Therefore, the timing output of the timing section To, which starts counting clock pulses cp by the operation of the output relay R and the control relay ISH that operates under the operating conditions of the track relay OTH, and measures the actual time after one train passes the level crossing, is compared. It is compared with the setting output a of the setting unit TA in the device AO, and when the relay RR operates with the output, it means that one train has passed the point R. Thus, the memory relay ASR is forcibly restored when the 9th train advances through the track circuit BT and passes point R.

The above also applies to the relay LR that outputs a coincidence, and the memory relay BSR is forcibly restored when a train advances through the track circuit AT and passes point L. In addition, by setting the timer, comparator, and conditional circuit as shown in Figure 9,
The feature is that the memory relay ASR or BSR can be restored regardless of the train speed and train length, and that the addition count can be continued even if the short-circuit condition of the track circuit becomes temporarily defective. Note that each timer section TA, To.

TB is cleared by the operation of the matching output relay RR or LR as shown in the figure, and the control relay SR
will be restored.

Figure S shows a simple circuit for restoring memory relay 1ASR or BSFt instead of matching output relays RR and LR in Figure 9.
FIG. 2 is a circuit diagram of operating conditions for cut-off relays RR', LR'. That is, in FIG. S, the control relay SR' is operated via the recovery contact of the cutoff relay RR'ILR' on the condition that the track relay OTH is restored, that is, the train passes through the level crossing, and then the operation is self-maintained.

A time relay tfn that measures a certain period of time is driven through the operating contact SR', and after that certain period of time the operating contact U
This circuit is designed to restore the storage relay ASR or BSR by driving the cutoff relay RR' or LR' through the circuit R. However, the fixed time mentioned here is
It is necessary to take into consideration the minimum speed and maximum train length of the trains passing through the track circuit OT, and set the time when the rear part of one train finishes passing through the track circuit BT.

As described in the above embodiment, the present invention relates to a control logic circuit of a conventional level crossing safety device as shown in FIG.

This prevents the extremely dangerous drawback of no warning and no shutoff at railroad crossings, and has a significant effect on improving the safety level of this type of equipment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the track circuit arrangement for controlling a level crossing in a single track section and its equipment, Fig. 2 is a conventional level crossing control logic circuit diagram, Fig. 3 is a circuit diagram in which the present invention is applied to the same circuit, and FIG. 9 is a timing comparison circuit and its conditional circuit diagram as an embodiment of the present invention, and FIG. S is a simplified substitute circuit diagram of the present invention. H: Level crossing, T: Railroad, OT, AT, BT:
Track circuit, ATR, BTR, OTR: track relay,
ASR: Right direction memory relay, BSR: Left direction memory relay, C! R: Control relay, AL: Level crossing alarm. G: Level crossing barrier, TA, TB: Time setting section, TO: Timing section, AO, BO: Comparator, ISR: Control relay. R1, Ll: Output relay, RR, LR matching ratio output relay Patent applicant: Nippon Signal Co., Ltd. Agent Rikichi Ichikawa

Claims (1)

[Claims] A track circuit with at least the length of the track that intersects with the level crossing, and track circuits with the required length adjacent to the left and right sides of this track circuit are provided, and the traveling direction of the train can be detected based on the detection conditions of a train approaching the level crossing. , and the condition of the circuit for storing the traveling direction under the condition of detecting a train after passing through the level crossing, and the condition of detecting a train approaching the level crossing, and driving the level crossing safety device under the condition of detecting one train passing through the level crossing and the condition of the circuit storing the traveling direction. In a level crossing safety device for a single track section that resets the drive of the safety device depending on the condition, output is generated for a required length of time set by measuring the time from detection of a train approaching a level crossing to detection of a train passing through the level crossing. A time setting circuit and a timing circuit that starts time measurement and generates a departure time under the conditions of the output generation and the condition of the train passing through the level crossing are provided, and the measurement time length of the timing circuit and the set time length match each other. A no-warning prevention circuit for a level crossing safety device in a single track section, characterized in that the memory of the direction of travel is reset under the condition that.