JPS6239360A - Method of electronically controlling electric point machine - 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] [Industrial Application Field] The present invention improves a part of the existing motor control circuit built in an electric switch machine for switching railway switches, and uses an electronic control circuit. This invention relates to a method for improving the performance and reliability of electric point machines.

[Conventional technology]

FIG. 1 shows a conventional motor drive control circuit for an electric point machine.

Since the conventional motor drive control circuit of an electric point machine requires a large drive current, a magnetically held point control relay W is installed inside the electric point machine as shown in Fig. 1. It has a built-in circuit controller CC that cuts off the drive current when the conversion is completed. The drive @ power supply PWI is connected to the common terminal CT of the motor M, and the drive power supply PW2 is connected to the motor M via the reverse mid-change contact RC of the circuit controller CC and the position contact WN of the reverse control relay W. is connected to the localization drive terminal NT. In addition, the drive power PW2 is connected to the localization intermediate change contact NC of the circuit controller CC and the opposite position contact WR of the switch control relay W.
It is connected to the reverse drive terminal RT of the knee dirt M through the terminal.

FIG. 2 shows the operation time chart.

The turnout is switched by a point control relay W, and the straight direction is set as the normal position, and the branch direction is set as the reverse position, and except during switching, it is always fixed in either the normal position or the reverse position and is controlled to the normal position side. , when the contact WN is configured, a circuit on the side of the reverse position changeover contact RC and the position drive terminal NT of the motor M is configured, and the current Ni
The motor M is driven in the localization direction. When the conversion is completed, the reverse conversion contact RC is released, and the flow Ni
When the motor M is cut off, the motor M is driven or stopped, and at the same time, the signal is cut off at the supply end of the conversion signal WL and the circuit is short-circuited.

In addition, when changing from the normal position state to the reverse position state, in contrast to the above, the switch control relay W is controlled to the reverse position side by the negative polarity N conversion signal WL, and the contact WR is configured. A circuit is formed between the conversion contact NC and the opposite drive terminal RT of the motor M, and the motor M is driven in the opposite direction by the current Ri. Then, when the conversion is completed, the localization midway conversion contact N
When C is released and the current R4 is cut off, the motor M stops moving, and at the same time, the signal is cut off at the supply end of the conversion signal WL and the circuit is short-circuited. .

This short circuit of the switching signal WL circuit is intended to improve safety so that switching is not performed erroneously due to a slow current caused by a ground fault in the middle of the control cable.

[Problem that the invention seeks to solve]

Electric switch machines are mounted on the sleepers of turnouts in station premises and are mechanically connected to the tip rail of the turnout by lots, so they are subject to large shocks and heat when the axle passes through the tip rail. It is exposed to the worst environment such as humidity. Therefore, in order to prevent erroneous switching control of magnetic holding relays due to mechanical shock, the Japanese National Railways is adding a mechanism to mechanically fix them at times other than switching. Additionally, in areas where freezing occurs, heaters are installed to prevent freezing. In these mechanisms, wear caused by mechanical vibration is one of the negative factors in terms of maintenance.

In addition, as mentioned above, when the motor starts, a large starting current flows to the contacts of the point control relay, and when the motor stops, a large current due to the back electromotive force flows to the contacts of the circuit controller. The contacts are subject to extremely severe wear and tear, so they are replaced regularly.

On the other hand, the inside of an electric point machine is affected by temperature changes in the outside air.
j Since dew easily forms, the water droplets can also adhere to the switch mechanism and electrical circuits, causing rust, poor contact, and in some areas, incomplete contact in the electrical circuit due to icing on the contact surface. There is an impact. Turn on the motor drive power.
Because it is a FF system, the inertial energy of the motor and conversion gear is absorbed by friction clutch 9. Therefore, the friction clutch causes oxidation and mechanical wear of the internal IJ due to frictional heat in proportion to its operation.

On the other hand, if a foreign object gets caught in the turnout, the motor continues to rotate, and all of its energy is absorbed by the friction clutch, resulting in burnout of the friction clutch and burnout of the motor.

Therefore, they are periodically brought into the factory for disassembly inspections and repair of consumable parts, and as the costs involved are extremely high, there are strong demands for improvements.

In addition, if an abnormality occurs in the electric circuit of the electric switch, the safety device can stop and display the traffic lights on the relevant route, so there is no problem in terms of safety, but there are lines in the commuting section etc. In areas with a high density of cabins, there were many problems, such as the indirect danger of delays in the army when passengers boarded and alighted on the platforms, and the effects of this, including inconvenience to commuters, were extremely severe.

In order to solve these problems, the present invention provides a method for solving these problems all at once by electronically controlling the drive circuit of an electric point machine.

Means for Solving the Problem] The present invention employs the following control method to achieve the above-mentioned object. That is, the control contacts of the circuit controller are removed from the motor control circuit of the conventional electric point machine, and the triac and current sensor are connected to the point control relay contacts.
By zero-crossing the triac using an electronic control circuit, it is possible to prevent wear and tear on the point control relay contacts. Therefore, the control contacts of the circuit controller can be omitted and the contact capacity of the switch control relay can be reduced, making it possible to create a compact sealed structure for the switch control relay. Therefore, there are two things you can do to prevent motor burnout.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 shows the switch control circuit of the present invention, and FIG. 4 shows the switch control flow.

The control circuit for the electric point machine according to the present invention is a triac T! which has a resistor R and a capacitor C connected in series and further connected in parallel. Ll and triac TR2 are provided, and the first
The circuit-based fIlI device is removed from the conventional motor control circuit shown in the figure, and the driving power source PWI is connected to the common terminal CT of the motor M via the triac TRI. On the other hand, the drive power source PW2 is constituted by an electronic control circuit C that connects a current sensor C8 and the triac TR2 in series, and further inputs the signal of the point current sensor C8 to control the triac TR1 and the triac TR2.

- In the figure, the electronic control circuit EC that converts the electric point machine from reverse to normal position inputs the conversion signal WL and determines the positive polarity P, and after the above contact WN is configured, the triac T
R2 is controlled and switched at the zero cross point, and the flow sensor C8 confirms that no drive current is flowing, and the next control is started.

If drive current Ni is flowing, triac T
After determining that R2 has caused a short circuit failure and outputting a failure alarm, the next triac TRI is controlled and switched at the zero cross point. Then, it is confirmed that the drive current Ni is flowing through the current sensor C8. The sensor M is driven in the localization direction by the control of the stiffness. If the drive current N i b'- is not flowing, the triac TRI
After determining that triac TR2 has an open failure and turning off triac TRI and triac TR2, a failure alarm is output and the control operation is stopped.

The Ni and Ri flowing through the motor fluctuate violently and become large values while the tip rail is changing, but after the tip rail has finished changing, the electric point machine has a locking operation to maintain this switching state. The t-flow Ni has a characteristic of being stable and decreasing significantly until the end of the period.

The electronic control circuit EC controls the motor 'MEN i' during conversion.
is monitored by current sensor C8, and the Ni flowing through the motor is stable.
By detecting the decrease, it is determined that the conversion of the tip rail is complete. If the conversion is not completed even after the predicted conversion completion time has elapsed, the triac TRI and the triac TR2 are turned off at the zero-crossing point, and then a failure alarm is output and the operation is stopped.

When he detected the completion of the change of the tip rail, he switched on the triac TR2 at the zero-crossing point after a certain period of time had elapsed, and after confirming that the motor current Ni was disconnected using the current sensor C8, he switched on the triac TR1 at the zero-crossing point. Switch off. This control allows the drive power to be turned off earlier than before and at the optimal timing, reducing the energy absorbed by the friction clutch and dramatically extending the life of the friction clutch. If the drive current Ni continues to flow even after the switch is turned on, it is determined that the triac TR2 has caused a short-circuit failure, and a failure alarm is output. Also,
Even if the triac TR1 is switched off, the drive current Ni
If it is flowing, a failure alarm is output and the control operation is stopped.

is configured, and a circuit on the opposite drive terminal RT side of the motor M is configured.

The electronic control circuit EC inputs the conversion signal WL and outputs the negative polarity N.
After determining and configuring the contact WR, the triac TR2 is controlled and switched at the zero cross point, and the current sensor C8 confirms that no drive current is flowing, and the next control is started.

If the drive current Ri is flowing, the triac T
After determining that R2 has caused a short circuit failure and outputting a failure alarm, the next triac TRI is controlled and switched at the zero cross point. Then, it is confirmed that the drive current Ri is flowing through the current sensor C8. These controls drive the motor M in the opposite direction. If it is not flowing, it is determined that triac TRI or triac TR2 has an open failure, and after turning off triac TRI and triac TR2, a failure alarm is output and the control operation is stopped.

The electronic control circuit EC monitors the motor current Ri during conversion using a current sensor C8, detects that the motor current Ri is stable or decreases, and determines whether the conversion of the tip rail is completed.

If the conversion is not completed even after the conversion termination side time has elapsed, the triac TRI and the triac TR2 are turned off at the zero cross point, and then a disablement alarm is output and the operation is stopped.

When the end of change of the tip rail is detected, the triac TR2 is switched off at the zero cross point after a certain period of time has elapsed, and after the current sensor C8 confirms that the motor current Ri has been cut off, the triac TR2 is switched off at the zero cross point. Turn on the switch and end conversion control.

Note that even if the triac TR2 is switched on, if the drive current Ri is flowing, it is determined that the triac TR2 has caused a short-circuit failure and a failure alarm is output. Further, even if the triac TRI is switched on, if the drive current Ri is flowing, a failure alarm is output and the control operation is stopped.

As a method for detecting the end of change of the tip rail, there may be several methods other than the drive current sensing described above. For example, there are methods of using an existing lock misalignment sensor that detects the conversion state of the tip rail, a method of using it in combination, a method of installing a dedicated sensor, etc., which can improve the accuracy of conversion completion.

In addition, according to this electronic control method, the drive timing for one direction is changed even if the motor does not drive due to a failure in the electronic control circuit or triac that depends on the conventional technology, or even if the motor is driven. Since the tip rail of the device remains fixed, there are no safety issues. Therefore, electronic control circuits have asymmetric characteristics,
In other words, it does not have fail-safe characteristics, so it can be improved at low cost and has a large static flow effect.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the conventional position mid-change contact NC and reverse position mid-change contact RC are omitted, and the motor currents Ni and Ri are applied to the contacts WN and WR of the shift control relay W. Since the electric point machine can be controlled without having to perform any switching, wear and tear on these contacts is extremely reduced, and the capacity of the conventional contacts is not increased. Therefore, since only a small contact is required, the switch control relay W can be made into a compact sealed structure, eliminating the need for a mechanism to prevent erroneous switching due to mechanical shock, and also eliminating the problem of contact failure due to condensation. can be solved all at once, and reliability can be expected to improve.

In addition, conventionally, the inertia energy of the motor and the conversion gear was absorbed by the 7-reaction clutch at the end of the conversion, but at the end of the conversion of the tip rail, the motor currents Ni and Ri are This inertial energy can be reduced. Therefore, the life of the 7-reaction clutch is extended, so 1! The period of periodic disassembly and inspection of the tactile machine can be significantly extended, resulting in extremely significant cost savings.

In addition, since the control of the switching direction and timing relies on the conventional one-way switch control relay, the electronic control circuit is not particularly designed with fail-safe characteristics for safety reasons, and improvements at a reasonable price are not possible. can.

Furthermore, even if a foreign object gets caught in the turnout, it can be easily detected by monitoring the motor current and switching time, so the motor current can be cut off and burnout can be prevented.These effects are extremely significant. .

[Brief explanation of the drawing]

Figure 1 is a block diagram of the control circuit configuration of a conventional electric switch, and Figure 2 is a block diagram of a conventional electric switch...drive power supply, PW2...drive power supply, CC...circuit. Control M...
Motor, P...Positive polarity, N...Negative polarity, Ni...
Motor current, Ri...Motor current, EC...Electronic control circuit, C8...Current sensor, TR1...Triac, TR2...Triac, R...Resistance, C...
... Condenser designation fee entry Japan - Tatsuzo Honma, Director of the Legal Affairs Division of the President's Office, Figure 1, Figure 2, R Figure 3

Claims (1)

[Claims] In a control circuit for a motor built into an electric switch that switches switches on railways, a triax is provided in which a resistor and a capacitor connected in series are further connected in parallel, and one side of the motor drive power is connected through the triax. A localization control circuit in which a current sensor and another triact are connected in series to a common terminal of the motor, and further connected to a localization drive terminal of the motor via a localization contact of a point control relay, and a point control circuit. From the reverse control circuit connected to the reverse control side terminal of the motor via the reverse contact of the relay, and the electronic control circuit that inputs the current sensor signal and the drive voltage of the point control relay to control the triac. Electronic control method for electric point machine