JPH0535028Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a railway switch control circuit, and is designed to prevent the switch from switching when an interference occurs during switching of the switch, resulting in a switching failure. By detecting and outputting a switching control signal in the opposite direction to the switching direction, the switch is returned to its original state and the adverse effects on the switch, drive motor, friction clutch, etc. due to switching failure are avoided. It is made to be removable.

<Conventional technology> A conventional switch machine control circuit detects a switching failure by using the normal position contact or the reverse position contact when the switch machine has changed to the normal position or the reverse direction within a predetermined time. Detected by relay. If an interference occurs during switching of the switch and a switching failure occurs, the switching failure detection relay times up because the normal position contact or the reverse position contact does not complete its operation within a predetermined time. This time-up signal is used to sound an alarm, such as a buzzer, so that the worker can eliminate the cause of the changeover obstruction. In this case, a change command in the same direction is still issued to the switch machine.

<Problem to be solved by the invention> As mentioned above, the conventional switch machine control circuit is capable of controlling the switch machine when interference occurs during switching of the switch and a switching failure occurs. Since the switch machine, its drive motor, and friction clutch were designed to remove the cause of the changeover obstruction while issuing a changeover command in the same direction, the switch machine, its drive motor, and friction clutch remained in operation from the time the changeover obstruction occurred until the obstruction was removed. The motor remains in a driven state, causing negative effects such as overload and wear, shortening its lifespan.

Therefore, the problem of the present invention is to detect when a changeover occurs due to interference during the changeover of a switch machine and to output a changeover control signal in the opposite direction to the changeover direction. To provide a switch control circuit capable of restoring a switch to its original state and eliminating adverse effects on the switch, drive motor, friction clutch, etc. caused by defective switching.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a switch control circuit including a positioning contact, a reverse position contact, a switching failure detection relay, and a processing circuit. , the contact state of the normal position contact and the reverse position contact changes in response to the change of the point machine; is detected by the contact state of the normal position contact or the reverse position contact, and the processing circuit detects that the change is not made within a predetermined time by the contact output signal of the conversion failure detection relay. Outputs conversion control signal.

<Function> The contact state of the normal position contact and the reverse position contact changes in response to the change of the point machine, and the changeover failure detection relay is used when the change of the point machine to the normal position or the reverse position is determined. If something is not done within the specified time, it is detected by the contact status of the positioning contact or the opposite positioning contact, so if there is an interference during switching of the switch machine and a switching failure occurs, the specified positioning contact will be returned within the specified time. In addition, the contact state of the opposite contact cannot be obtained, and a conversion failure can be detected.

The processing circuit outputs a switching control signal in the opposite direction to the switching direction based on the contact output signal of the switching fault detection relay, so it returns the switch machine to its original state and prevents the switch machine and drive motor due to the switching fault. It is also possible to eliminate adverse effects on friction clutches and the like.

<Example> FIGS. 1 to 3 are sequence diagrams of a switch machine control circuit according to the present invention. First, in Fig. 1, NKR and RKR are the contacts of the point display relay, the contact NKR is the positioning contact that responds to the switch in the direction of the position N of the point machine, and the contact RKR is also the positioning contact that responds to the change in the direction of the position N of the point machine. The positioning contact NKR and the reverse contact RKR are configured as drop contacts (break contacts; the same applies hereinafter). The positioning contact NKR is open when the switch has completed the conversion to the position N, but is closed when the switch is in the middle of conversion. Also, anti-position contact
RKR is also open when the switch has completed the conversion to reverse R, and closed when it is in the middle of conversion.

The FLR is a switching failure detection relay that detects through the normal position contact NKR and the reverse position contact RKR that the switch machine is not changed in the normal position N or reverse position R direction within a predetermined time, and is a type of timer relay. It works as. In this embodiment, the normal position contact NKR and the reverse position contact RKR are connected in series with the conversion failure detection relay FLR. If the conversion is not completed within a predetermined period of time, e.g. 2 to 5 seconds after the conversion command is issued, as shown in Figure 2, a time-up signal is generated from contact FLR ₁ of the conversion failure detection relay FLR, which is energized as shown by arrow A. A contact output signal S1 is output.

The processing circuit C outputs a switching control signal S ₂ or S ₃ in the opposite direction to the switching direction based on the contact output signal S ₁ of the switching failure detection relay FLR. Specifically, the second
It is constructed as shown in FIG.

Next, in Fig. 2, FLR ₁ is a contact point that serves as a time-up signal for the conversion failure detection relay FLR.
It is configured as an operating contact (make contact; the same applies hereinafter).

RR is the reverse relay, RR ₁ is the operating contact of the reverse relay RR, and RR ₂ is also the drop contact. NR is the positioning relay, NR ₁ is the operation contact of the positioning relay NR, NR ₂
is also a falling contact. WR ₁ is the positioning side contact of the point machine control relay WR (see Figure 3), WR ₂
is also the contact on the opposite side, and RS is the reset switch.

The reversal relay RR is a conversion failure detection relay.
FLR operating contact FLR ₁ , point machine control relay WR
Contact WR ₁ of , and falling contact NR ₂ of positioning relay NR
It is connected to power supplies (+) and (-) through its own operating contact RR ₁ in parallel with operating contact FLR ₁ , contact WR ₁ and drop contact NR ₂ .

The positioning relay NR is the operation contact FLR ₁ of the switching failure detection relay FLR, and the contact of the switch machine control relay WR.
Connect to the power supply (+) and (-) through WR ₂ and the falling contact RR ₂ of the reverse relay RR, as well as the operating contact.
It is connected to the power supply (+) through its own operating contact NR ₁ in parallel with FLR ₁ , WR ₂ and fall contact RR ₂ .

Next, in Fig. 3, WR is a switch control relay. The point machine control relay WR is composed of a magnetic holding relay, and once it is energized and operated, it maintains its operating state even if the energization is cut off. WLR is a point machine locking relay, WLR ₁ and
WLR ₂ is the operating contact of relay WLR, RR ₃ and RR ₄
is the contact of the reverse position relay RR, NR ₃ and NR ₄ are the contacts of the position relay NR, and A is the lock circuit.

Next, the operation will be explained. Concerning the case where a changeover command is given to a point machine that has been changed to the reverse position R, and the changeover occurs in the direction of the normal position N due to interference during the changeover of the switch machine, resulting in a defective changeover. state First, in FIG. 1, at the same time as the point machine starts to change in the direction of the normal position N, the opposite position contacts RKR and NKR fall and close. If there is an interference during the switching of the switch and a switching failure occurs, the opposite position contacts RKR and NKR will remain closed, so the switching failure detection relay FLR will pass through the positioning contacts NKR and RKR and The power is turned on beyond the period of time, resulting in a time-up. As a result, the operating contact
FLR ₁ closes, counter relay RR contacts WR ₁ , NR ₂
It is energized as shown by arrow A through the reset switch RS and is then self-held by its own operating contact _RR1 .

By the self-holding action of the reverse relay RR, the operating contacts RR ₃ , RR ₅ and the normal relay
The relay WLR is energized through the drop contact _NR4 of NR, and its operating contacts _WLR1 and _WLR2 close.
As a result, a current Ir flows in the direction of arrow B through the point control relay WR via the locking circuit A and the contacts _RR3 , _WLR2 , _WLR1 and _RR5 . This current Ir in the direction of arrow B of the point control relay WR corresponds to the direction of the reverse R, i.e., the reverse switch command signal _S2 . For this reason, based on the normal switch command,
A control signal is obtained so that the switching command that was about to switch from the reverse position R to the normal position N returns to the reverse position R, and the point is returned to the original reverse direction. Therefore, even if a switching failure occurs, there is no adverse effect such as overload, wear, or shortened life on the motor and friction clutch that drive the point. In addition, since the point returns to the original switching completion state, even though the direction is opposite to that of the regular switching command, it is possible to prevent trains running up due to switching failure and the resulting damage and destruction of the point and track.

To release this operating state, after removing the cause of the conversion failure, operate the reset switch RS.
This is done by turning off the power to the reverse relay RR.

Even if a conversion failure occurs during conversion from the normal position N to the reverse position R, the same operation can be obtained by the action of the localization relay NR. In this case, the current In flowing through the point machine control relay WR is opposite to the current Ir, as shown by the arrow C in Fig. 3, so the direction of the localization N,
That is, a control signal _S3 for returning in the opposite direction is obtained.

<Effects of the invention> As described above, according to the invention, when an interference occurs during switching of a switch machine and a switching failure occurs, this is detected and the switching control is performed in the opposite direction to the switching direction. By outputting the signal, it is possible to return the switch to its original state and eliminate the adverse effects on the switch, drive motor, friction clutch, etc. caused by a switching failure.

[Brief explanation of the drawing]

1 to 3 are sequence diagrams of the switch machine control circuit according to the present invention. NKR……Positive contact, RKR……Reverse position contact, FLR
...Conversion failure detection relay, WR...Switch machine control relay, C...Processing circuit.

Claims (1)

[Claims for Utility Model Registration] A switch control circuit including a positioning contact NKR, a reverse position contact RKR, a switching failure detection relay FLR, and a processing circuit C, comprising: a positioning contact NKR and a positioning contact RKR; Contact RKR is
The state of the contact changes in response to the switching of the point machine, and the switching failure detection relay FLR detects that the switch is not switched to the normal position or the reverse position within a predetermined time. Detection is performed based on the contact state of the positioning contact NKR or the reverse position contact RKR, and the processing circuit C is configured to detect the conversion failure detection relay.
A switch control circuit that outputs a switching control signal S ₂ or S ₃ in the opposite direction to the switching direction based on the FLR contact output signal S ₁ .