Shield door safety circuit fault detection and control method and device

Abstract

The invention provides a shield door safety circuit fault detection and control method and device, and relates to the field of fault detection and control. A first voltage between two ends of an equivalent coil (a first input end and a second input end of the safety relay unit) of the safety relay unit, a second voltage between a power supply positive electrode and the first input end of the safety relay unit, and a third voltage between the second input end and a power supply negative electrode of the safety relay unit are detected; therefore, the state of the safety loop is detected. When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, it is judged that the safety circuit breaks down, at the moment, the safety relay unit is driven to send out an action signal, it is represented that all the shielding doors are closed through the action signal, and then the train control system can control a train to operate normally; therefore, the influence of safety circuit faults on train operation is eliminated.

Description

Technical Field

[0001] The invention relates to the field of fault detection and control, and in particular to a method and device for detecting and controlling a fault of a safety circuit of a shielding door. Background Art

[0002] The platform screen door of the subway station is a device used to isolate the platform from the track and improve the safety of passengers. After the train enters the platform, the platform screen door is controlled to open when the door opening command is issued, and the platform screen door is controlled to close when the door closing command is issued. The train can only leave the platform after confirming that all the platform screen doors are closed. Each platform screen door is equipped with a travel switch. When the platform screen door is opened, the travel switch is disconnected, and when the platform screen door is closed, the travel switch is closed. The travel switch contacts on multiple platform screen doors are connected in series with the safety relay to form a safety circuit. When the safety circuit is turned on, it proves that all the platform screen doors have been closed. At this time, the safety relay is triggered to act and the action signal that the platform screen door has been closed is sent to the train control system.

[0003] When the safety circuit is normal, the on-off of the safety circuit can be used to determine whether the platform screen door is closed, and then control the train operation. However, when the safety circuit fails, it may not be able to give the train an accurate control signal. For example, as the use time increases, the resistance in the safety circuit will increase, resulting in the inability to drive the safety relay even after all the travel switches are closed, or the travel switch is not closed when the platform screen door is closed, resulting in an open circuit in the safety circuit, and the inability to drive the safety relay to operate, thus affecting the train operation. Summary of the invention

[0004] In view of this, the present application provides a method, device, storage medium and computer equipment for detecting and controlling a safety circuit fault of a platform screen door, the main purpose of which is to solve the technical problem that a safety circuit fault affects train operation.

[0005] According to a first aspect of the present invention, a method for detecting and controlling a safety circuit fault of a platform shielding door is provided. The method is used to detect and control the safety circuits of a plurality of platform shielding doors on the same side of a platform. The travel switches on the left door of each platform shielding door are connected in series to obtain a first circuit, and the travel switches on the right door of each platform shielding door are connected in series to obtain a second circuit. The safety circuit includes the first circuit, the second circuit and a safety relay unit. The first circuit is connected between the positive power supply and the first input terminal of the safety relay unit, and the second circuit is connected between the second input terminal of the safety relay unit and the negative power supply. The method includes:

[0006] Acquire a first voltage between the first input terminal and the second input terminal of the safety relay unit, a second voltage between the positive pole of the power supply of the safety relay unit and the first input terminal, and a third voltage between the second input terminal of the safety relay unit and the negative pole of the power supply;

[0007] When the first voltage is lower than a preset first threshold and the second voltage or the third voltage reaches a preset second threshold, the safety relay unit is driven to send an action signal, wherein the action signal is used to indicate that all platform shielding doors on the same side are closed.

[0008] In some embodiments, a first relay unit is connected between the positive pole of the power supply and the first input end of the safety relay unit, a second relay unit is connected between the second input end of the safety relay unit and the negative pole of the power supply, and the contacts of the first relay unit and the second relay unit are both normally open;

[0009] When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, driving the safety relay unit to send an action signal comprises:

[0010] When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, the first relay unit and the second relay unit are controlled to close, so that the positive power supply terminal of the safety relay unit is short-circuited with the first input terminal, and the second input terminal of the safety relay unit is short-circuited with the negative power supply terminal, so as to drive the safety relay unit to send the action signal.

[0011] In some embodiments, each of the shielding doors is provided with a door controller and a door status indicator light, and the door controller is used to control the shielding door action, and the action modes include: executing a door opening action, executing a door closing action, maintaining a door opening state, and maintaining a door closing state; the method includes:

[0012] For each of the shielding doors, the voltage across the travel switch on the left door is detected to obtain the on-off state of the travel switch of the left door, and the voltage across the travel switch on the right door is detected to obtain the on-off state of the travel switch of the right door;

[0013] When the shielding door remains in a closed state, obtaining the on-off state of the left door travel switch and the on-off state of the right door travel switch;

[0014] If the on-off state of the left door travel switch is off and / or the on-off state of the right door travel switch is off, it is determined that the shielding door has a closing failure, and the door status indicator light is controlled to indicate the shielding door closing failure in a preset display mode.

[0015] According to a second aspect of the present invention, a device for detecting and controlling a safety circuit fault of a platform screen door is provided, wherein the device is used to detect and control the safety circuits of a plurality of platform screen doors on the same side of the platform, wherein the travel switches on the left door of each platform screen door are connected in series to obtain a first circuit, and the travel switches on the right door of each platform screen door are connected in series to obtain a second circuit, wherein the safety circuit comprises the first circuit, the second circuit and a safety relay unit, wherein the first circuit is connected between the positive power supply and the first input terminal of the safety relay unit, and the second circuit is connected between the second input terminal of the safety relay unit and the negative power supply; the device comprises:

[0016] a voltage detection module, configured to detect a first voltage between the first input terminal and the second input terminal of the safety relay unit, a second voltage between the positive electrode of the power supply of the safety relay unit and the first input terminal, and a third voltage between the second input terminal of the safety relay unit and the negative electrode of the power supply;

[0017] A control module is connected to the voltage detection module and is used to drive the safety relay unit to send an action signal when the first voltage is lower than a preset first threshold and the second voltage or the third voltage reaches a preset second threshold, wherein the action signal is used to indicate that all platform shielding doors on the same side are closed.

[0018] In some embodiments, the apparatus further comprises:

[0019] A first relay unit, connected between the positive pole of the power supply of the safety relay unit and the first input terminal, wherein the contact of the first relay unit is normally open;

[0020] A second relay unit, connected between the second input terminal of the safety relay unit and the negative pole of the power supply, the contact of the second relay unit being normally open;

[0021] The control module is used to control the first relay unit and the second relay unit to close when the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, so that the positive power supply terminal of the safety relay unit is short-circuited with the first input terminal, and the second input terminal of the safety relay unit is short-circuited with the negative power supply terminal, so as to drive the safety relay unit to send the action signal.

[0022] In some embodiments, the voltage detection module includes a first voltage detection unit, a second voltage detection unit and a third voltage detection unit; the device also includes a third relay unit, a fourth relay unit and a fifth relay unit, the third relay unit, the fourth relay unit and the fifth relay unit each include two groups of relays, and the two groups of relays of the third relay unit are single-pole double-throw relays;

[0023] The input end of the first voltage detection unit is connected to the first input end and the second input end of the safety relay unit, and the output end of the first voltage detection unit is connected to the control module;

[0024] The first voltage detection unit is used to detect a first voltage between the first input terminal and the second input terminal of the safety relay unit; when the first voltage is higher than the first threshold, the first voltage detection unit outputs a high level; when the first voltage is lower than the first threshold, the first voltage detection unit outputs a low level;

[0025] The first input end of the second voltage detection unit is connected to the positive pole of the power supply of the safety relay unit, and the second input end of the second voltage detection unit is connected to the common end of the first group of relays of the third relay unit;

[0026] The first input end of the third voltage detection unit is connected to the common end of the second group of relays of the third relay unit, and the second input end of the third voltage detection unit is connected to the negative pole of the power supply of the safety relay unit;

[0027] In the third relay unit, the normally closed end of the first group of relays is connected to the first end of the first group of relays in the fourth relay unit, and the normally open end of the first group of relays is connected to the first end of the second group of relays in the fourth relay unit;

[0028] In the third relay unit, the normally closed end of the second group of relays is connected to the first end of the second group of relays in the fourth relay unit, and the normally open end of the second group of relays is connected to the first end of the first group of relays in the fourth relay unit;

[0029] In the fourth relay unit, the second end of the first group of relays is connected to the first end of the first group of relays in the fifth relay unit, and the second end of the second group of relays is connected to the first end of the second group of relays in the fifth relay unit;

[0030] In the fifth relay unit, the second end of the first group of relays is connected to the first input end of the safety relay unit, and the second end of the second group of relays is connected to the second input end of the safety relay unit;

[0031] The control end of the third relay unit, the control end of the fourth relay unit, and the control end of the fifth relay unit are all connected to the control module, the contact of the fourth relay unit is normally open, and the contact of the fifth relay unit is normally closed;

[0032] One end of the first circuit is connected to the positive pole of the power supply of the safety relay unit, and the other end is connected to the first input end of the safety relay unit through the first group of relays of the fifth relay unit, and a plurality of travel switches in the first circuit are connected in series between the positive pole of the power supply of the safety relay and the first end of the first group of relays in the fifth relay unit;

[0033] One end of the second circuit is connected to the second input end of the safety relay unit through the second group of relays of the fifth relay unit, and the other end is connected to the negative power supply pole of the safety relay unit. Multiple travel switches in the second circuit are connected in series between the negative power supply pole of the safety relay and the first end of the second group of relays in the fifth relay unit.

[0034] In some embodiments, the device further comprises: a first current limiting resistor and a second current limiting resistor;

[0035] One end of the first current limiting resistor is connected to the normally open end of the second group of relays of the third relay unit, and the other end of the first current limiting resistor is connected to the first end of the first group of relays of the fourth relay unit;

[0036] One end of the second current limiting resistor is connected to the normally open end of the first group of relays of the third relay unit, and the other end of the second current limiting resistor is connected to the first end of the second group of relays of the fourth relay unit.

[0037] In some embodiments, the control module is used to control the fourth relay unit to close when the first voltage detection unit outputs a low level, so that the second voltage detection unit detects a second voltage between the positive pole of the power supply of the safety relay unit and the first input terminal, and the third voltage detection unit detects a third voltage between the second input terminal of the safety relay unit and the negative pole of the power supply;

[0038] Wherein, when the second voltage is lower than the second threshold, the second voltage detection unit outputs a low level; when the second voltage reaches the second threshold, the second voltage detection unit outputs a high level; when the third voltage is lower than the second threshold, the third voltage detection unit outputs a low level; when the third voltage reaches the second threshold, the third voltage detection unit outputs a high level;

[0039] The control module is used to control the fifth relay unit to be disconnected and the third relay to be switched when the second voltage detection unit or the third voltage detection unit outputs a high level, so that the second voltage detection unit is connected in series with the second circuit, and the third voltage detection unit is connected in series with the first circuit;

[0040] Wherein, when all the travel switches in the first circuit are closed and the resistance of the travel switches in the first circuit is less than the sensitivity threshold, the third voltage detection unit outputs a first control signal, and when all the travel switches in the second circuit are closed and the resistance of the travel switches in the second circuit is less than the sensitivity threshold, the second voltage detection unit outputs a second control signal;

[0041] The control module is used to control the first relay unit and the second relay unit to close according to the first control signal and / or the second control signal.

[0042] In some embodiments, the device further comprises a conversion switch, the conversion switch is provided with a first conversion position and a second conversion position, and the conversion switch is connected to the control module;

[0043] When the switching switch is switched to the first switching position, the control module controls the second relay unit to close according to the first control signal, and controls the first relay unit to close according to the second control signal;

[0044] When the conversion switch is converted to the second conversion position, the control module controls the first relay unit to close and the second relay unit to close simultaneously according to the first control signal and / or the second control signal.

[0045] In some embodiments, each of the shielding doors is provided with a door controller and a door status indicator light, the door status indicator light is connected to the door controller, the door controller is used to control the shielding door action, and the action modes include: executing a door opening action, executing a door closing action, maintaining a door opening state, and maintaining a door closing state; the device further includes: a fourth voltage detection unit and a fifth voltage detection unit;

[0046] For each of the shielding doors, two ends of the travel switch on the left door are connected to the fourth voltage detection unit, and two ends of the travel switch on the right door are connected to the fifth voltage detection unit, and the output end of the fourth voltage detection unit and the output end of the fifth voltage detection unit are both connected to the door controller;

[0047] The fourth voltage detection unit is used to detect the on / off state of the travel switch on the left door of the shielding door. When the travel switch on the left door is closed, the fourth voltage detection unit outputs a low level, and when the travel switch on the left door is disconnected, the fourth voltage detection unit outputs a high level;

[0048] The fifth voltage detection unit is used to detect the on / off state of the travel switch on the right door of the shielding door. When the travel switch on the right door is closed, the fifth voltage detection unit outputs a low level. When the travel switch on the right door is disconnected, the fifth voltage detection unit outputs a high level.

[0049] The door controller is used for controlling the door status indicator light to indicate the closing fault of the shielding door in a preset display mode if the fourth voltage detection unit outputs a high level and / or the fifth voltage detection unit outputs a high level when the shielding door remains in a closed state.

[0050] The present invention provides a method and device for detecting and controlling faults in a safety circuit of a shielding door. The method detects the state of the safety circuit by detecting the first voltage at both ends of the equivalent coil of the safety relay unit (the first input end and the second input end of the safety relay unit), the second voltage between the positive pole of the power supply of the safety relay unit and the first input end, and the third voltage between the second input end of the safety relay unit and the negative pole of the power supply. For each shielding door, the travel switch on the left door is connected to the first circuit, and the travel switch on the right door is connected to the second circuit. When the shielding door is closed or opened, the left door and the right door are controlled by the same transmission mechanism, that is, the left door and the right door perform the same door opening and closing action. Under normal circumstances, when the shielding door is opened, the left door and the right door are both opened, the travel switches on the left door and the right door are both disconnected, and the first circuit and the second circuit are both open; when the shielding door is closed, the left door and the right door are both closed, the travel switches on the left door and the right door are both closed, and the first circuit and the second circuit are both connected. When it is detected that the first voltage is lower than the preset first threshold value, and the second voltage or the third voltage reaches the preset second threshold value, it indicates that one of the first safety circuit and the second safety circuit is turned on and the voltage drop is normal (not exceeding the second threshold value), and the other circuit has an excessive voltage drop (exceeding the second threshold value) due to increased resistance or circuit breakage. At this time, the shield door should be in a closed state. However, since the voltage drop of one circuit becomes larger, the voltage across the equivalent coil of the safety relay unit is reduced to a level that is insufficient to drive the safety relay unit to operate. Therefore, although the shield door has been closed, the safety relay unit cannot send an action signal to the train control system and cannot control the departure of the train. Therefore, it is determined that the safety circuit has failed. At this time, the safety relay unit is driven to send an action signal to notify the train control system that all the shield doors on the same side of the platform have been closed. Next, the train control system can control the normal operation of the train, thereby eliminating the impact of the safety circuit failure on the train operation.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0053] Figure 1 A schematic flow chart of a method for detecting and controlling a fault in a safety circuit of a shielded door provided by an embodiment of the present invention is shown;

[0054] Figure 2 A schematic diagram of the circuit structure of a shield door safety circuit provided by an embodiment of the present invention is shown;

[0055] Figure 3 A circuit diagram of a device for detecting and controlling a fault in a safety circuit of a shielded door provided by an embodiment of the present invention is shown;

[0056] Figure 4 A schematic flow chart of another method for detecting and controlling a safety circuit fault of a shielded door provided by an embodiment of the present invention is shown;

[0057] Figure 5 A circuit structure diagram of another device for detecting and controlling a safety circuit fault of a shielding door provided by an embodiment of the present invention is shown.

[0058] Illustration Description:

[0059] 1. The positive pole of the power supply of the safety relay unit; 2. The first input terminal of the safety relay unit; 3. The second input terminal of the safety relay unit; 4. The negative pole of the power supply of the safety relay unit; A1. The first voltage detection unit; A2. The second voltage detection unit; A3. The third voltage detection unit; A4. The fourth voltage detection unit; A5. The fifth voltage detection unit; P1. The output terminal of the first voltage detection unit; P2. The output terminal of the second voltage detection unit; P3. The output terminal of the third voltage detection unit; Relay1. The first relay unit; Relay2. The second relay unit; Relay3. The third relay unit; Relay4. The fourth relay unit; Relay5. The fifth relay unit; ASD. The shielding door; DCU. The door controller; R1. The first current limiting resistor; R2. The second current limiting resistor. DETAILED DESCRIPTION

[0060] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0061] It should be understood that the terms "first", "second", and various numerical numbers are only used for the convenience of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. When an element is said to be "connected" to other elements, the element can be directly connected to the other elements, or there can be intermediate elements. "And / or" is used to describe the association relationship of objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0062] In one embodiment, Figure 1 As shown, a method for detecting and controlling a safety circuit fault of a platform shielding door is provided. The method is used to detect and control the safety circuits of a plurality of platform shielding doors on the same side of the platform. The travel switches on the left door of each platform shielding door are connected in series to obtain a first circuit, and the travel switches on the right door of each platform shielding door are connected in series to obtain a second circuit. The safety circuit includes the first circuit, the second circuit and a safety relay unit. The first circuit is connected between the positive power supply and the first input terminal of the safety relay unit, and the second circuit is connected between the second input terminal of the safety relay unit and the negative power supply. The method includes the following steps:

[0063] 101. Obtain a first voltage between a first input terminal and a second input terminal of the safety relay unit, a second voltage between a positive power supply terminal of the safety relay unit and the first input terminal, and a third voltage between the second input terminal of the safety relay unit and a negative power supply terminal.

[0064] 102. When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, drive the safety relay unit to send an action signal, wherein the action signal is used to indicate that all the platform shielding doors on the same side are closed.

[0065] The platform shield door is installed on the subway platform to isolate the platform from the train track and ensure the safety of passengers. After the train enters the platform, the control system issues a door opening command to control the platform shield door to open. After the passengers get on the train, the control system issues a door closing command to control the platform shield door to close. Only when it is confirmed that all the platform shield doors are closed can the train be controlled to leave the platform. Among them, the platform shield door safety circuit is usually used to detect whether the platform shield door is fully closed after the door closing command is issued. Figure 2 As shown, a schematic diagram of a safety circuit of a shielding door is provided. Usually, a shielding door includes a left door and a right door, and each of the left door and the right door has a set of travel switches. Under normal circumstances, when the shielding door is opened, the travel switches on the left door and the right door are disconnected, and when the shielding door is closed, the travel switches on the left door and the right door are closed. Figure 2ASD stands for a shield door. Figure 2 The left door and the right door of the shielding door shown in each of the two travel switches. In the safety circuit provided by this embodiment, the travel switches on each shielding door on the same side of a platform are connected in series according to the left door and the right door to obtain two circuits, that is, the travel switches on the left doors of all shielding doors on the same side of the platform are connected in series to obtain the first circuit, and the travel switches on the right doors of all shielding doors on the same side of the platform are connected in series to obtain the second circuit. In one embodiment, assuming that there are 30 shielding doors on one side of the platform, and each shielding door has two travel switches on the left door and the right door, then 60 travel switches on the left door are connected in series in the first circuit, and 60 travel switches on the right door are connected in series in the second circuit. The first circuit and the second circuit are connected to a safety relay unit, that is, a safety circuit for multiple shielding doors on the same side of the platform is obtained.

[0066] The safety relay unit includes four input terminals, namely, the positive power supply 1, the first input terminal 2, the second input terminal 3 and the negative power supply 4. The positive power supply 1 and the negative power supply 4 are used to provide input voltage, and the first input terminal 2 and the second input terminal 3 are equivalent to the two ends of the equivalent coil inside the safety relay unit. The two ends of the first loop are respectively connected to the positive power supply 1 and the first input terminal 2 of the safety relay unit, and the two ends of the second loop are respectively connected to the second input terminal 3 and the negative power supply 4 of the safety relay unit.

[0067] Ideally, after a door closing control command is issued to the platform shielding door, if all the platform shielding doors are closed, the travel switches in the first circuit and the second circuit are all closed, that is, the first circuit and the second circuit are both turned on. At this time, the first input terminal 2 of the safety relay unit is equal to the positive electrode 1 of the power supply, the second input terminal 3 is equal to the negative electrode 4 of the power supply, and the voltage between the first input terminal 2 and the second input terminal 3 is approximately equal to the input voltage of the safety relay unit. The input voltage of the safety relay unit is greater than the driving voltage, so that the safety relay unit can be driven to operate, so that the safety relay unit sends an action signal to the train control system that the platform shielding doors have all been closed, and then the train can be controlled to leave the platform. After a door closing command is issued to the platform shielding door, if not all the platform shielding doors are closed, that is, there is a situation where the platform shielding doors are not closed, the voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit cannot drive the safety relay unit to operate, and the train cannot be controlled to leave the platform at this time. Therefore, through the safety circuit, it can be achieved to ensure that all the platform shielding doors are closed before controlling the train operation to ensure the safety of passengers.

[0068] However, in actual application, as the service life increases, the contacts of the shielding door travel switch will form an oxide film under the action of the arc, which will increase the resistance in the safety circuit. In addition, the oxide film on the travel switch contacts is uneven, and the position of the travel switch in contact with the contacts is not strictly fixed each time it is closed, resulting in inconsistent resistance in the circuit each time it is closed. Since the safety relay unit has a driving voltage requirement, that is, the voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit can only drive the safety relay unit to operate when it reaches the driving voltage. The increase in resistance in the safety circuit will cause a voltage drop between the positive pole 1 of the power supply of the safety relay unit and the first input terminal 2, and a voltage drop between the second input terminal 3 and the negative pole 4 of the power supply, thereby reducing the voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit. When the resistance in the safety circuit increases to the point that the voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit is lower than the driving voltage, even if all the travel switches in the first circuit and the second circuit are closed, the safety relay unit cannot be driven to operate. In addition, it is possible that all the shielding doors have been closed, but the travel switch fails and causes a circuit breaker, and the safety relay unit cannot be driven to operate at this time. That is to say, in actual application, there may be a situation where even if all the platform shield doors are closed, the safety relay unit cannot be driven to operate, thereby affecting the normal operation of the train.

[0069] Based on this, this embodiment detects the fault of the safety circuit by detecting the voltage across the equivalent coil of the safety relay unit and the voltage drop between the first circuit and the second circuit, and drives the safety relay unit to operate normally when a fault is detected, thereby eliminating the impact of the safety circuit fault on the normal operation of the train.

[0070] Specifically, the voltage detection module detects the first voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit, the second voltage between the positive power supply 1 and the first input terminal 2 of the safety relay unit, and the third voltage between the second input terminal 3 and the negative power supply 4 of the safety relay unit. Since the greater the resistance in the first circuit or the second circuit, the greater the second voltage or the third voltage, the smaller the first voltage. Therefore, a first threshold is set for the first voltage, and a second threshold is set for the second voltage and the third voltage. When the first voltage is lower than the first threshold and the second voltage or the third voltage reaches the second threshold, it is determined that the safety circuit is faulty. Among them, the first threshold and the second threshold can be determined according to the input voltage and the drive voltage of the safety relay unit.

[0071] In a specific embodiment, it is assumed that the input voltage of the safety relay unit (i.e., the voltage between the positive pole 1 of the power supply and the power supply 4) is 60V, and the driving voltage of the safety relay unit is 47.5V. If it is lower than 47.5V, the safety relay unit cannot be driven to operate. Then the voltage drop of the first circuit and the second circuit together cannot exceed 60V-47.5V=12.5V, and the average voltage drop of each circuit cannot exceed 12.5V÷2=6.25V. In order to leave a certain amount of redundancy for fault detection, it can be set that when the voltage drop of a circuit reaches 6.25V, the safety circuit is controlled. Therefore, the first threshold value can be set to about 60V-6.25V=53.75V, for example, 53±1V, and the second threshold value can be set to 6.25±1V. It should be noted that the specific values ​​of the first threshold value and the second threshold value in this embodiment are only examples, and can be determined according to actual conditions.

[0072] Generally, the resistance values ​​of the first circuit and the second circuit are close, so when the first voltage is lower than the first threshold, the second voltage and the third voltage may not exceed the second threshold (that is, the voltage drop of the first circuit and the second circuit does not exceed the second threshold), and it will not be determined as a safety circuit failure. When the first voltage is lower than the first threshold, and the second voltage or the third voltage exceeds the second threshold, the safety circuit is determined to be faulty, the control of the safety circuit is triggered, and the safety relay unit is driven to send an action signal.

[0073] The present embodiment provides a method for detecting and controlling a fault in a safety circuit of a shielding door, which detects the state of the safety circuit by detecting the first voltage at both ends of the equivalent coil of the safety relay unit (the first input end 2 and the second input end 3 of the safety relay unit), the second voltage between the positive power supply 1 and the first input end 2 of the safety relay unit, and the third voltage between the second input end 3 and the negative power supply 4 of the safety relay unit. For each shielding door, the travel switch on the left door is connected to the first circuit, and the travel switch on the right door is connected to the second circuit. When the shielding door is closed or opened, the left door and the right door are controlled by the same transmission mechanism, that is, the left door and the right door perform the same door opening and closing action. Under normal circumstances, when the shielding door is opened, the left door and the right door are both opened, the travel switches on the left door and the right door are both disconnected, and the first circuit and the second circuit are both open; when the shielding door is closed, the left door and the right door are both closed, the travel switches on the left door and the right door are both closed, and the first circuit and the second circuit are both connected. When it is detected that the first voltage is lower than the preset first threshold value, and the second voltage or the third voltage reaches the preset second threshold value, it indicates that one of the first safety circuit and the second safety circuit is turned on and the voltage drop is normal (not exceeding the second threshold value), and the other circuit has an excessive voltage drop (exceeding the second threshold value) due to increased resistance or circuit breakage. At this time, the shield door should be in a closed state. However, since the voltage drop of one circuit becomes larger, the voltage across the equivalent coil of the safety relay unit (i.e., the first voltage) is reduced to a level that is insufficient to drive the safety relay unit to operate. Therefore, although the shield door has been closed, the safety relay unit cannot send an action signal to the train control system, and cannot control the departure of the train. Therefore, it is determined that the safety circuit has failed. At this time, the safety relay unit is driven to send an action signal to notify the train control system that all the shield doors on the same side of the platform have been closed. Next, the train control system can control the normal operation of the train, thereby eliminating the impact of the safety circuit failure on the train operation.

[0074] In one embodiment, a first relay unit Relay1 is connected between the positive power pole 1 and the first input terminal 2 of the safety relay unit, and a second relay unit Relay2 is connected between the second input terminal 3 and the negative power pole 4 of the safety relay unit, and the contacts of the first relay unit Relay1 and the second relay unit Relay2 are both normally open. Step 102 can be specifically implemented in the following manner: when the first voltage is lower than a preset first threshold value, and the second voltage or the third voltage reaches a preset second threshold value, the first relay unit Relay1 and the second relay unit Relay2 are controlled to close, so that the positive power pole 1 of the safety relay unit is short-circuited with the first input terminal 2, and the second input terminal 3 of the safety relay unit is short-circuited with the negative power pole 4, so as to drive the safety relay unit to send the action signal.

[0075] Specifically, a first relay unit Relay1 can be connected between the positive power pole 1 and the first input terminal 2 of the safety relay unit, and a second relay unit Relay2 can be connected between the second input terminal 3 of the safety relay unit and the negative power pole 4, and the contacts of the first relay unit Relay1 and the second relay unit Relay2 are normally open. When the first voltage is lower than the first threshold value, and the second voltage or the third voltage exceeds the second threshold value, the positive power pole 1 of the safety relay unit is short-circuited with the first input terminal 2, and the second input terminal 3 of the safety relay unit is short-circuited with the negative power pole 4, thereby driving the safety relay unit to operate normally when the shield door is closed, eliminating the impact of the fault on the train operation.

[0076] As a specific implementation of the method shown in the above embodiment, Figure 3 As shown, this embodiment provides a device for detecting and controlling a fault in a safety circuit of a shielding door. The method described in the above embodiment is applied to the device for detecting and controlling a fault in a safety circuit of a shielding door. The device is used to detect and control Figure 2 The safety circuit of multiple platform shielding doors on the same side of the platform shown in the figure, for the description of the safety circuit, please refer to the above method embodiment, which will not be repeated here. The device includes: a voltage detection module and a control module. Among them, the voltage detection module is used to detect the first voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit, the second voltage between the positive power supply 1 and the first input terminal 2 of the safety relay unit, and the third voltage between the second input terminal 3 and the negative power supply 4 of the safety relay unit. The control module is connected to the voltage detection module, and is used to drive the safety relay unit to send an action signal when the first voltage is lower than the preset first threshold value and the second voltage or the third voltage reaches the preset second threshold value, wherein the action signal is used to indicate that all the platform shielding doors on the same side are closed.

[0077] Furthermore, the device also includes: a first relay unit Relay1 and a second relay unit Relay2. The first relay unit Relay1 is connected between the positive power supply electrode 1 and the first input terminal 2 of the safety relay unit, and the contact of the first relay unit Relay1 is normally open. The second relay unit Relay2 is connected between the second input terminal 3 and the negative power supply electrode 4 of the safety relay unit, and the contact of the second relay unit Relay2 is normally open. The control module is used to control the first relay unit Relay1 and the second relay unit Relay2 to close when the first voltage is lower than the preset first threshold value and the second voltage or the third voltage reaches the preset second threshold value, so that the positive power supply electrode 1 of the safety relay unit is short-circuited with the first input terminal 2, and the second input terminal 3 of the safety relay unit is short-circuited with the negative power supply electrode 4, so as to drive the safety relay unit to send the action signal.

[0078] In the above embodiment, a first relay unit Relay1 is connected between the positive power pole 1 and the first input terminal 2 of the safety relay unit, and a second relay unit Relay2 is connected between the second input terminal 3 and the negative power pole 4 of the safety relay unit, and the contacts of the first relay unit Relay1 and the second relay unit Relay2 are normally open. A control module is provided, and the output terminal of the voltage detection module is connected to the control module, and the control module is connected to the control terminal of the first relay unit Relay1 and the control terminal of the second relay unit Relay2. When the first voltage is lower than the first threshold value, and the second voltage or the third voltage exceeds the second threshold value, the control module sends a high level to control the first relay unit Relay1 and the second relay unit Relay2 to close, short-circuit the positive power pole 1 of the safety relay unit with the first input terminal 2, and short-circuit the second input terminal 3 of the safety relay unit with the negative power pole 4, thereby driving the safety relay unit to operate normally when the shield door is closed, eliminating the influence of the fault on the train operation.

[0079] In one embodiment, Figure 3 As shown, the voltage detection module includes a first voltage detection unit A1, a second voltage detection unit A2 and a third voltage detection unit A3. The two input terminals of the first voltage detection unit A1 are respectively connected to the first input terminal 2 and the third input terminal 3 of the safety relay unit, and the output terminal P1 of the first voltage detection unit A1 is connected to the control module. The first voltage detection unit A1 is used to detect the first voltage between the first input terminal 2 and the second input terminal 3 of the safety relay unit; when the first voltage is higher than the first threshold, the first voltage detection unit outputs a high level; when the first voltage is lower than the first threshold, the first voltage detection unit outputs a low level.

[0080] The shield door safety circuit fault detection and control device provided in the embodiment of the present application also includes a third relay unit Relay3, a fourth relay unit Relay4 and a fifth relay unit Relay5. The third relay unit Relay3, the fourth relay unit Relay4 and the fifth relay unit Relay5 each include two groups of relays, wherein the third relay unit Relay3 is a single-pole double-throw relay.

[0081] The first input end of the second voltage detection unit A2 is connected to the positive pole 1 of the power supply of the safety relay unit, and the second input end of the second voltage detection unit A2 is connected to the common end of the first group of relays of the third relay unit Relay3. The normally closed end of the first group of relays of the third relay unit Relay3 is connected to the first end of the first group of relays in the fourth relay unit Relay4, and the normally open end of the first group of relays of the third relay unit Relay3 is connected to the first end of the second group of relays in the fourth relay unit Relay4. The second end of the first group of relays in the fourth relay unit Relay4 is connected to the first end of the first group of relays in the fifth relay unit Relay5, and the second end of the first group of relays in the fifth relay unit Relay5 is connected to the first input end 2 of the safety relay unit.

[0082] The first input end of the third voltage detection unit A3 is connected to the common end of the second group of relays of the third relay unit Relay3, and the second input end of the third voltage detection unit A3 is connected to the negative power supply electrode 4 of the safety relay unit. The normally closed end of the second group of relays of the third relay unit Relay3 is connected to the first end of the second group of relay units in the fourth relay unit Relay4, and the normally open end of the second group of relays of the third relay unit Relay3 is connected to the first end of the first group of relays in the fourth relay unit Relay4. The second end of the second group of relays in the fourth relay unit Relay4 is connected to the first end of the second group of relays in the fifth relay unit Relay5, and the second end of the second group of relays in the fifth relay unit Relay5 is connected to the second input end 3 of the safety relay unit.

[0083] The control ends of the third relay unit Relay3, the fourth relay unit Relay4 and the fifth relay unit Relay5 are all connected to the control module, wherein the contact of the fourth relay unit Relay4 is normally open and the contact of the fifth relay unit Relay5 is normally closed.

[0084] Among them, one end of the first circuit is connected to the positive power pole 1 of the safety relay unit, and the other end is connected to the first input terminal 2 of the safety relay unit through the first group of relays of the fifth relay unit Relay5, and multiple travel switches in the first circuit are connected in series between the positive power pole 1 of the safety relay and the first end of the first group of relays in the fifth relay unit Relay5. One end of the second circuit is connected to the second input terminal 3 of the safety relay unit through the second group of relays of the fifth relay unit Relay5, and the other end is connected to the negative power pole 4 of the safety relay unit, and multiple travel switches in the second circuit are connected in series between the negative power pole 4 of the safety relay and the first end of the second group of relays in the fifth relay unit Relay5.

[0085] In the above embodiment, the first voltage detection unit A1, the second voltage detection unit A2 and the third voltage detection unit A3 can all be optical coupling relays. The optical coupling relay includes two input terminals and two output terminals, one of which is used to connect to a voltage source, and the other output terminal can be connected to a load. That is, the first output terminal of each voltage detection unit is connected to a voltage source (with Figure 3 For example, the first output terminal is connected to a 24V DC voltage), and the second output terminal is connected to the control module. It should be understood that, unless otherwise specified, the output terminal of the voltage detection unit mentioned in the embodiment of the present application defaults to the second output terminal. In this embodiment, the first voltage detection unit A1, the second voltage detection unit A2, and the third voltage detection unit A output a high level or a low level, which means that the second output terminal exhibits a high level or a low level.

[0086] Among them, the on-voltage of the first voltage detection unit A1 is the voltage corresponding to the first threshold, and the on-voltages of the second voltage detection unit A2 and the third voltage detection unit A3 are both voltages corresponding to the second threshold. When the voltage detection unit is turned on, the output terminal shows a high level, that is, 1; when it is not turned on, the output terminal shows a low level, that is, 0. It can be understood that the conduction of the voltage detection unit refers to the conduction between the first output terminal and the second output terminal of the optocoupler relay. Among them, for different voltage detection units, the model of the optocoupler relay can be selected according to the on-voltage, and the corresponding on-voltage can also be set by connecting a resistor in series at the input end of the optocoupler relay.

[0087] The control module is used to control the fourth relay unit Relay4 to close when the first voltage detection unit A1 outputs a low level, so that the second voltage detection unit A2 detects the second voltage between the positive power supply electrode 1 and the first input terminal 2 of the safety relay unit, and the third voltage detection unit A3 detects the third voltage between the second input terminal 3 of the safety relay unit and the negative power supply electrode 4. When the second voltage is lower than the second threshold, the second voltage detection unit A2 outputs a low level; when the second voltage reaches the second threshold, the second voltage detection unit A2 outputs a high level; when the third voltage is lower than the second threshold, the third voltage detection unit A3 outputs a low level; when the third voltage reaches the second threshold, the third voltage detection unit A3 outputs a high level. The control module is also used to control the fifth relay unit Relay5 to disconnect when the second voltage detection unit A2 or the third voltage detection unit A3 outputs a high level, and control the third relay to switch, so that the second voltage detection unit A2 is connected in series with the second circuit, and the third voltage detection unit A3 is connected in series with the first circuit. Wherein, when all the travel switches in the first circuit are closed and the resistance of the travel switches in the first circuit is less than the sensitivity threshold, the third voltage detection unit A3 outputs a first control signal, and when all the travel switches in the second circuit are closed and the resistance of the travel switches in the second circuit is less than the sensitivity threshold, the second voltage detection unit A2 outputs a second control signal. The control module is also used to control the first relay unit Relay1 and the second relay unit Relay2 to close according to the first control signal and / or the second control signal. Wherein, the first control signal is used to indicate that the third voltage detection unit A3 outputs a high level, and the second control signal is used to indicate that the second voltage detection unit A2 outputs a high level.

[0088] In the above embodiment, when the first voltage is lower than the first threshold, it indicates that the safety circuit may have a fault, and at this time, it is necessary to further judge in combination with the second voltage and the third voltage. Specifically, the contact of the fourth relay unit Relay4 is normally open, and at this time, the second voltage detection unit A2 and the third voltage detection unit A3 do not measure the second voltage and the third voltage. When the first voltage detection unit A1 detects that the first voltage is lower than the first threshold, it outputs a low level. When the control module detects that the first voltage detection unit A1 outputs a low level, it drives the fourth relay unit Relay4 to close. At this time, the second voltage detection unit A2 detects the second voltage, and the third voltage detection unit A3 detects the third voltage. If both the second voltage and the third voltage are lower than the second threshold, the second voltage detection unit A2 and the third voltage detection unit A3 both output a low level, that is, 00, and it is determined that the safety circuit has no fault. When one of the second voltage and the third voltage exceeds the second threshold, one of the second voltage detection unit A2 and the third voltage detection unit A3 outputs a high level and the other outputs a low level, that is, when the control module detects that the output signals of the second voltage detection unit A2 and the third voltage detection unit A3 are 10 or 01, it is determined that the safety circuit has a fault.

[0089] After determining that there is a fault in the safety circuit, the control module drives the fifth relay unit Relay5 to disconnect, that is, the first input end 2 of the safety relay unit is disconnected from the first circuit, and the second input end 3 of the safety relay unit is disconnected from the second circuit. The control module simultaneously controls the switching of the single-pole double-throw switch of the third relay unit Relay3, so that the second input end of the second voltage detection unit A2 is connected to the second group of relays of the fourth relay unit Relay4, and the first input end of the third voltage detection unit A3 is connected to the first group of relays of the fourth relay unit Relay4. Thus, the positive pole 1 of the power supply of the safety relay unit, the second voltage detection unit A2, the travel switch connected in series in the second circuit, and the negative pole of the power supply of the safety relay unit constitute a circuit. The positive pole 1 of the power supply of the safety relay, the travel switch connected in series in the first circuit, the third voltage detection unit A3, and the negative pole 4 of the power supply of the safety relay constitute a circuit. That is, the second voltage detection unit A2 is connected in series with the travel switch in the second circuit, and the third voltage detection unit A3 is connected in series with the travel switch in the first circuit. When all the travel switches in the first circuit are closed and the current is greater than the driving current of the third voltage detection unit A3, the third voltage detection unit A3 outputs a first control signal. When all the travel switches in the second loop are closed and the current is greater than the driving current of the second voltage detection unit A2, the second voltage detection unit A2 outputs a second control signal. The current in the loop is related to the resistance of the travel switch, and the current is greater than the driving current of the second voltage detection unit A2 or the third voltage detection unit A3, that is, the resistance of the travel switch in the loop is less than the sensitivity threshold of the loop. For example, assuming that the driving current of the second voltage detection unit A2 and the third voltage detection unit A3 is 0.9mA, when the resistance in the loop is greater than 30kΩ, resulting in the loop current being less than 0.9mA, the sensitivity threshold is 30kΩ.

[0090] After receiving the first control signal and / or the second control signal, the control module controls the first relay unit Relay1 and the second relay unit Relay2 to be turned on, and drives the safety relay unit to operate. When the shielding door is opened, the travel switches in the first circuit and the second circuit are disconnected, the second voltage detection unit A2 and the third voltage detection unit A3 do not output the first control signal and the second control signal, the control module does not control the first relay unit Relay1 and the second relay unit Relay2 to be turned on, and the safety relay unit is not driven. It can be seen that the shielding door safety circuit fault detection and control device provided in the embodiment of the present application detects a safety circuit fault when the shielding door is closed, and can eliminate the impact of the fault by controlling the safety circuit, and when the shielding door is opened, it will not affect the normal use of the safety circuit.

[0091] In one embodiment, the shield door safety circuit fault detection and control device provided by the embodiment of the present application further includes a conversion switch, the conversion switch is provided with a first conversion position and a second conversion position, and the conversion switch is connected to a control module. When the conversion switch is converted to the first conversion position, the control module controls the second relay unit Relay2 to close according to the first control signal, and controls the first relay unit Relay1 to close according to the second control signal. When the conversion switch is converted to the second conversion position, the control module controls the first relay unit Relay1 to close and the second relay unit Relay2 to close at the same time according to the first control signal and / or the second control signal.

[0092] In the above embodiment, the control device can control the first relay unit Relay1 and the second relay unit Relay2 to close in two ways. Specifically, a conversion switch can be set, the conversion switch is connected to the control module, and the conversion switch includes two conversion positions, and different conversion positions correspond to different control methods. Among them, one way is to place the conversion switch in the first conversion position, that is, the "AND" position, and control the first relay unit Relay1 and the second relay unit Relay2 to close respectively through the first control signal and the second control signal. This method requires that the travel switches in the first circuit and the second circuit are both turned on, and the resistance values ​​are both lower than the sensitivity threshold. Another way is to place the conversion switch in the second conversion position, that is, the "OR" position, and control the first relay unit Relay1 and the second relay unit Relay2 to close at the same time through one of the first control signal and the second control signal. This method allows one circuit to be broken in the first circuit and the second circuit.

[0093] In the above embodiment, after the second voltage detection unit A2 and the third voltage detection unit A3 are connected in series into the loop, the sensitivity threshold in the loop is higher than the original shielding door safety loop. In a specific example, the original resistance sensitivity of the safety relay unit is about 900Ω, that is, Figure 2 When the resistance in the safety circuit exceeds 900Ω, the safety relay unit cannot be driven. By applying the shield door safety circuit fault detection and control device provided by the embodiment of the present application, the maximum resistance in the circuit can be allowed to be around 40kΩ, that is, the travel switch in the safety circuit can be allowed to have a larger resistance.

[0094] In the above embodiment, in addition to the fault caused by the increase of resistance, the safety circuit failure may also be manifested as the shield door is closed but the travel switch is not closed, that is, the first circuit or the second circuit is broken. Taking the first circuit broken and the second circuit turned on as an example, the two input ends of the voltage detection unit A2 are connected between the positive pole 1 of the power supply of the safety relay unit and the first input end 2 to measure the second voltage. When the first circuit is broken, there should be no voltage between the positive pole 1 of the power supply of the safety relay unit and the first input end 2, but because the voltage detection unit A2 is connected between the positive pole 1 of the power supply and the first input end 2, when the first circuit is broken, a path is formed between the positive pole 1 of the power supply and the first input end 2 through the voltage detection unit A2. The voltage detection unit A2 is turned on, and the second voltage detection unit A2 outputs a high level, and at this time, the voltage drop (i.e., the second voltage) between the positive pole 1 of the power supply and the first input end 2 caused by the internal resistance of the voltage detection unit A2 is greater than the second threshold. The second circuit is a path, and the third voltage detection unit A3 outputs a low level. Therefore, in this case, the control of the safety circuit will also be triggered to drive the safety relay unit to act. That is, by applying the platform screen door safety circuit fault detection and control device provided in the present application, not only the safety circuit fault caused by the increase of resistance in the safety circuit can be eliminated, but also the safety circuit fault caused by the trip switch disconnection can be eliminated without affecting the normal operation of the train.

[0095] In one embodiment, the shield door safety circuit fault detection and control device provided in the embodiment of the present application further includes a first current limiting resistor R1 and a second current limiting resistor R2. One end of the first current limiting resistor R1 is connected to the normally open end of the second group of relays of the third relay unit Relay3, and the other end of the first current limiting resistor R1 is connected to the first end of the first group of relays of the fourth relay unit Relay4. One end of the second current limiting resistor R2 is connected to the normally open end of the first group of relays of the third relay unit Relay3, and the other end of the second current limiting resistor R2 is connected to the first end of the second group of relays of the fourth relay unit Relay4.

[0096] In the above embodiment, the first current limiting resistor R1 and the second current limiting resistor R2 are used to prevent the current in the circuit from being too large and burning the power supply of the safety relay unit after the second voltage detection unit A2 and the third voltage detection unit A3 are connected in series into the circuit. Among them, the resistance sensitivity threshold of the travel switch in the circuit is also affected by the resistance value of the current limiting resistor. For example, assuming that the maximum resistance allowed in the circuit is 40k, if the resistance value of the current limiting resistor is 10k, the resistance sensitivity threshold of the travel switch is 40k-10k=30k, that is, the maximum resistance allowed after the travel switch is closed is 30k. Based on this, the resistance values ​​of the first current limiting resistor R1 and the second current limiting resistor R2 can be determined according to the requirements of the safety relay unit for current and the actual situation, to ensure that the safety relay unit is protected.

[0097] In one embodiment, each group of relays in the relay unit in the embodiment of the present application can be obtained by connecting two relays in parallel, thereby improving the reliability of the operation of the relay unit.

[0098] In one embodiment, the shield door safety circuit fault detection and control device provided in the embodiment of the present application further includes a reset switch connected to the control module. The control module is used to control each relay unit to return to a default state when the reset switch sends a reset signal.

[0099] In the above embodiment, the reset switch can be started at predetermined intervals. For example, after the subway train ends its operation every day, the safety circuit is inspected and maintained. After the fault is eliminated, the reset switch is started to restore the platform shield door safety circuit fault detection and control device provided in the embodiment of the present application to the default state.

[0100] Each of the shielding doors is provided with a door controller DCU and a door status indicator light. The door controller DCU is used to control the shielding door actions, including: executing door opening actions, executing door closing actions, keeping the door open, keeping the door closed, etc. In one embodiment, Figure 4 As shown, the shield door safety circuit fault detection and control method provided in the embodiment of the present application also includes:

[0101] 201. For each of the shielding doors, the voltage across the travel switch on the left door is detected to obtain the on-off state of the travel switch of the left door, and the voltage across the travel switch on the right door is detected to obtain the on-off state of the travel switch of the right door.

[0102] 202. When the shielding door remains in a closed state, obtain the on / off state of the left door travel switch and the on / off state of the right door travel switch.

[0103] 203. If the on-off state of the left door travel switch is off and / or the on-off state of the right door travel switch is off, it is determined that the shielding door has a closing failure, and the door status indicator light is controlled to indicate the shielding door closing failure in a preset display mode.

[0104] In the above embodiment, when the travel switch is closed, the two ends of the travel switch are at the same potential. When the travel switch is disconnected, the two ends of the travel switch are equivalent to a mega-level resistance and a tiny current, so the voltage can be measured at both ends of the travel switch. Based on this, the on-off state of the travel switch can be detected by measuring the voltage at both ends of the travel switch. When there is no voltage at both ends of the travel switch or the voltage is less than the preset threshold, it indicates that the on-off state of the travel switch is closed; when there is a voltage at both ends of the travel switch or the voltage exceeds the preset threshold, it indicates that the on-off state of the travel switch is disconnected. The preset threshold can be determined by measuring the maximum voltage at both ends when the travel switch is closed (ideally, when the travel switch is closed, the two ends are at the same potential and there is no potential difference. In practice, since the travel switch itself has resistance, there may be a certain potential difference).

[0105] When the shielding door is in the closed state, the travel switches on the left and right doors of the shielding door should all be closed. If at least one of the travel switches of the left and right doors of the shielding door is detected to be in the open state at this time, it proves that the safety circuit has failed when the shielding door is closed, and the door status indicator on the shielding door can indicate the shielding door closing failure. Among them, the fault display mode should be different from the display mode when the shielding door is normal. For example, when the shielding door is normal, the door status indicator can be displayed as always on when the shielding door is opened and kept open, and the door status indicator can be displayed as 1hz flashing when the shielding door is closed, and the door status indicator can be off when the shielding door is kept closed. Then, when the shielding door closing failure is detected, the door status indicator can be displayed as 0.5hz flashing, etc., so as to prompt the staff to carry out maintenance.

[0106] Further, such as Figure 5 As shown, each of the shielding doors is provided with a door controller DCU and a door status indicator light, the door status indicator light is connected to the door controller DCU, and the door controller DCU is used to control the shielding door action, and the action modes include: executing the door opening action, executing the door closing action, keeping the door open, and keeping the door closed. Figure 4The specific implementation of the method shown, the shield door safety circuit fault detection and control device provided in the embodiment of the present application also includes: a fourth voltage detection unit A4 and a fifth voltage detection unit A5. For each shield door, a fourth voltage detection unit A4 is connected to both ends of the travel switch on the left door, and a fifth voltage detection unit A5 is connected to both ends of the travel switch on the right door. The output ends of the fourth voltage detection unit A4 and the fifth voltage detection unit A5 are both connected to the door controller DCU. The fourth voltage detection unit A4 is used to detect the on-off state of the travel switch on the left door of the shield door. When the travel switch on the left door is closed, the fourth voltage detection unit A4 outputs a low level, and when the travel switch on the left door is disconnected, the fourth voltage detection unit A4 outputs a high level. The fifth voltage detection unit A5 is used to detect the on-off state of the travel switch on the right door of the shield door. When the travel switch on the right door is closed, the fifth voltage detection unit A5 outputs a low level, and when the travel switch on the right door is disconnected, the fifth voltage detection unit A5 outputs a high level. The door controller DCU is used to control the door status indicator to indicate the shielding door closing failure in a preset display mode if the fourth voltage detection unit A4 outputs a high level and / or the fifth voltage detection unit A5 outputs a high level when the shielding door remains in a closed state.

[0107] Wherein, the fourth voltage detection unit A4 and the fifth voltage detection unit A5 can both be optical coupling relays. The two input ends of the fourth voltage detection unit A4 are connected to the two ends of the left door travel switch of the shielding door, the first output end of the fourth voltage detection unit A4 is connected to the voltage source, and the second output end is connected to the door controller DCU. The two input ends of the fifth voltage detection unit A5 are connected to the two ends of the right door travel switch of the shielding door, the first output end of the fifth voltage detection unit A5 is connected to the voltage source, and the second output end is connected to the door controller DCU.

[0108] In the above embodiment, if Figure 5 As shown, for each shield door ( Figure 5 Only one screen door is shown. Figure 5 All shielding doors on the same side are included, and other shielding doors are not marked). After the two switches on the left door of the shielding door are connected in series, the two ends are connected to the input end of the fourth voltage detection unit A4. The fourth voltage detection unit A4 detects the on-off state of the travel switch by detecting the voltage between the travel switches of the left door. Similarly, after the two travel switches on the right door of the shielding door are connected in series, the two ends are connected to the input end of the fifth voltage detection unit A5. The fifth voltage detection unit A5 detects the on-off state of the travel switch by detecting the voltage between the travel switches of the right door. Among them, the first output end of the fourth voltage detection unit A4 and the fifth voltage detection power supply A5 is Figure 5 Not shown.

[0109] The fourth voltage detection unit A4 and the fifth voltage detection unit A5 detect the on / off state of the travel switch by detecting the voltage at both ends of the travel switch. When the travel switch is closed, the two ends of the travel switch are at the same potential, and the voltage detection unit outputs a low level. When the travel switch is disconnected, the two ends of the travel switch are equivalent to a mega-level resistance and a tiny current, so the voltage can be measured at both ends of the travel switch, and the voltage detection unit outputs a high level.

[0110] Each shielding door is provided with a door controller DCU, which is used to control the shielding door action, including controlling the shielding door to open, close, keep the door open, keep the door closed, etc. The shielding door is also provided with a door status indicator light, which is connected to the door controller DCU and is used to indicate the status of the shielding door. When the door controller DCU controls the shielding door to keep the door closed, or detects that the shielding door has been fully closed and entered the state of keeping the door closed, the detection results of the fourth voltage detection unit A4 and the fifth voltage detection unit A5 are obtained. If at least one of the fourth voltage detection unit A4 and the fifth voltage detection unit A5 outputs a high level, it proves that there is a travel switch on the shielding door that is not closed. At this time, the door controller DCU controls the door status indicator light to display in a preset manner to indicate a shielding door closing failure.

[0111] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0112] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A method for detecting and controlling a fault in a safety circuit of a shielding door, characterized in that: The method is used to detect and control the safety circuits of multiple platform shielding doors on the same side of the platform, the travel switches on the left door of each platform shielding door are connected in series to obtain a first circuit, and the travel switches on the right door of each platform shielding door are connected in series to obtain a second circuit, the safety circuit includes the first circuit, the second circuit and a safety relay unit, the first circuit is connected between the positive pole of the power supply and the first input end of the safety relay unit, and the second circuit is connected between the second input end of the safety relay unit and the negative pole of the power supply; the method includes: Acquire a first voltage between the first input terminal and the second input terminal of the safety relay unit, a second voltage between the positive pole of the power supply of the safety relay unit and the first input terminal, and a third voltage between the second input terminal of the safety relay unit and the negative pole of the power supply; When the first voltage is lower than a preset first threshold and the second voltage or the third voltage reaches a preset second threshold, the safety relay unit is driven to send an action signal, wherein the action signal is used to indicate that all platform shielding doors on the same side are closed.

2. The method according to claim 1, characterized in that A first relay unit is connected between the positive pole of the power supply and the first input end of the safety relay unit, and a second relay unit is connected between the second input end of the safety relay unit and the negative pole of the power supply, and the contacts of the first relay unit and the second relay unit are both normally open; When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, driving the safety relay unit to send an action signal comprises: When the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, the first relay unit and the second relay unit are controlled to close, so that the positive power supply terminal of the safety relay unit is short-circuited with the first input terminal, and the second input terminal of the safety relay unit is short-circuited with the negative power supply terminal, so as to drive the safety relay unit to send the action signal.

3. The method according to claim 1, characterized in that Each of the shielding doors is provided with a door controller and a door status indicator light, wherein the door controller is used to control the shielding door action, and the action modes include: executing the door opening action, executing the door closing action, maintaining the door opening state, and maintaining the door closing state; the method includes: For each of the shielding doors, the voltage across the travel switch on the left door is detected to obtain the on-off state of the travel switch of the left door, and the voltage across the travel switch on the right door is detected to obtain the on-off state of the travel switch of the right door; When the shielding door remains in a closed state, obtaining the on-off state of the left door travel switch and the on-off state of the right door travel switch; If the on-off state of the left door travel switch is off and / or the on-off state of the right door travel switch is off, it is determined that the shielding door has a closing failure, and the door status indicator light is controlled to indicate the shielding door closing failure in a preset display mode.

4. A device for detecting and controlling faults in a safety circuit of a shielding door, used to implement the method according to any one of claims 1 to 3, characterized in that: The device is used to detect and control the safety circuits of multiple platform shielding doors on the same side of the platform. The travel switches on the left door of each platform shielding door are connected in series to obtain a first circuit, and the travel switches on the right door of each platform shielding door are connected in series to obtain a second circuit. The safety circuit includes the first circuit, the second circuit and a safety relay unit. The first circuit is connected between the positive pole of the power supply and the first input end of the safety relay unit, and the second circuit is connected between the second input end of the safety relay unit and the negative pole of the power supply. The device includes: a voltage detection module, configured to detect a first voltage between the first input terminal and the second input terminal of the safety relay unit, a second voltage between the positive electrode of the power supply of the safety relay unit and the first input terminal, and a third voltage between the second input terminal of the safety relay unit and the negative electrode of the power supply; A control module is connected to the voltage detection module and is used to drive the safety relay unit to send an action signal when the first voltage is lower than a preset first threshold and the second voltage or the third voltage reaches a preset second threshold, wherein the action signal is used to indicate that all platform shielding doors on the same side are closed.

5. The device according to claim 4, characterized in that The device also includes: A first relay unit, connected between the positive pole of the power supply of the safety relay unit and the first input terminal, wherein the contact of the first relay unit is normally open; A second relay unit, connected between the second input terminal of the safety relay unit and the negative pole of the power supply, the contact of the second relay unit being normally open; The control module is used to control the first relay unit and the second relay unit to close when the first voltage is lower than a preset first threshold value and the second voltage or the third voltage reaches a preset second threshold value, so that the positive power supply terminal of the safety relay unit is short-circuited with the first input terminal, and the second input terminal of the safety relay unit is short-circuited with the negative power supply terminal, so as to drive the safety relay unit to send the action signal.

6. The device according to claim 5, characterized in that The voltage detection module includes a first voltage detection unit, a second voltage detection unit and a third voltage detection unit; the device also includes a third relay unit, a fourth relay unit and a fifth relay unit, the third relay unit, the fourth relay unit and the fifth relay unit each include two groups of relays, and the two groups of relays of the third relay unit are single-pole double-throw relays; The input end of the first voltage detection unit is connected to the first input end and the second input end of the safety relay unit, and the output end of the first voltage detection unit is connected to the control module; The first voltage detection unit is used to detect a first voltage between the first input terminal and the second input terminal of the safety relay unit; when the first voltage is higher than the first threshold, the first voltage detection unit outputs a high level; when the first voltage is lower than the first threshold, the first voltage detection unit outputs a low level; The first input end of the second voltage detection unit is connected to the positive pole of the power supply of the safety relay unit, and the second input end of the second voltage detection unit is connected to the common end of the first group of relays of the third relay unit; The first input end of the third voltage detection unit is connected to the common end of the second group of relays of the third relay unit, and the second input end of the third voltage detection unit is connected to the negative pole of the power supply of the safety relay unit; In the third relay unit, the normally closed end of the first group of relays is connected to the first end of the first group of relays in the fourth relay unit, and the normally open end of the first group of relays is connected to the first end of the second group of relays in the fourth relay unit; In the third relay unit, the normally closed end of the second group of relays is connected to the first end of the second group of relays in the fourth relay unit, and the normally open end of the second group of relays is connected to the first end of the first group of relays in the fourth relay unit; In the fourth relay unit, the second end of the first group of relays is connected to the first end of the first group of relays in the fifth relay unit, and the second end of the second group of relays is connected to the first end of the second group of relays in the fifth relay unit; In the fifth relay unit, the second end of the first group of relays is connected to the first input end of the safety relay unit, and the second end of the second group of relays is connected to the second input end of the safety relay unit; The control end of the third relay unit, the control end of the fourth relay unit, and the control end of the fifth relay unit are all connected to the control module, the contact of the fourth relay unit is normally open, and the contact of the fifth relay unit is normally closed; One end of the first circuit is connected to the positive pole of the power supply of the safety relay unit, and the other end is connected to the first input end of the safety relay unit through the first group of relays of the fifth relay unit, and a plurality of travel switches in the first circuit are connected in series between the positive pole of the power supply of the safety relay and the first end of the first group of relays in the fifth relay unit; One end of the second circuit is connected to the second input end of the safety relay unit through the second group of relays of the fifth relay unit, and the other end is connected to the negative power supply pole of the safety relay unit. Multiple travel switches in the second circuit are connected in series between the negative power supply pole of the safety relay and the first end of the second group of relays in the fifth relay unit.

7. The device according to claim 6, characterized in that The device further comprises: a first current limiting resistor and a second current limiting resistor; One end of the first current limiting resistor is connected to the normally open end of the second group of relays of the third relay unit, and the other end of the first current limiting resistor is connected to the first end of the first group of relays of the fourth relay unit; One end of the second current limiting resistor is connected to the normally open end of the first group of relays of the third relay unit, and the other end of the second current limiting resistor is connected to the first end of the second group of relays of the fourth relay unit.

8. The device according to claim 6, characterized in that The control module is used to control the fourth relay unit to close when the first voltage detection unit outputs a low level, so that the second voltage detection unit detects a second voltage between the positive electrode of the power supply of the safety relay unit and the first input terminal, and the third voltage detection unit detects a third voltage between the second input terminal of the safety relay unit and the negative electrode of the power supply; Wherein, when the second voltage is lower than the second threshold, the second voltage detection unit outputs a low level; when the second voltage reaches the second threshold, the second voltage detection unit outputs a high level; when the third voltage is lower than the second threshold, the third voltage detection unit outputs a low level; when the third voltage reaches the second threshold, the third voltage detection unit outputs a high level; The control module is used to control the fifth relay unit to be disconnected and the third relay to be switched when the second voltage detection unit or the third voltage detection unit outputs a high level, so that the second voltage detection unit is connected in series with the second circuit, and the third voltage detection unit is connected in series with the first circuit; Wherein, when all the travel switches in the first circuit are closed and the resistance of the travel switches in the first circuit is less than the sensitivity threshold, the third voltage detection unit outputs a first control signal, and when all the travel switches in the second circuit are closed and the resistance of the travel switches in the second circuit is less than the sensitivity threshold, the second voltage detection unit outputs a second control signal; The control module is used to control the first relay unit and the second relay unit to close according to the first control signal and / or the second control signal.

9. The device according to claim 8, characterized in that The device further comprises a conversion switch, the conversion switch is provided with a first conversion position and a second conversion position, and the conversion switch is connected to the control module; When the switching switch is switched to the first switching position, the control module controls the second relay unit to close according to the first control signal, and controls the first relay unit to close according to the second control signal; When the conversion switch is converted to the second conversion position, the control module controls the first relay unit to close and the second relay unit to close simultaneously according to the first control signal and / or the second control signal.

10. The device according to claim 4, characterized in that Each of the shielding doors is provided with a door controller and a door status indicator light, the door status indicator light is connected to the door controller, the door controller is used to control the shielding door action, the action modes include: executing the door opening action, executing the door closing action, keeping the door open, and keeping the door closed; the device also includes: a fourth voltage detection unit and a fifth voltage detection unit; For each of the shielding doors, two ends of the travel switch on the left door are connected to the fourth voltage detection unit, and two ends of the travel switch on the right door are connected to the fifth voltage detection unit, and the output end of the fourth voltage detection unit and the output end of the fifth voltage detection unit are both connected to the door controller; The fourth voltage detection unit is used to detect the on / off state of the travel switch on the left door of the shielding door. When the travel switch on the left door is closed, the fourth voltage detection unit outputs a low level, and when the travel switch on the left door is disconnected, the fourth voltage detection unit outputs a high level; The fifth voltage detection unit is used to detect the on / off state of the travel switch on the right door of the shielding door. When the travel switch on the right door is closed, the fifth voltage detection unit outputs a low level. When the travel switch on the right door is disconnected, the fifth voltage detection unit outputs a high level. The door controller is used for controlling the door status indicator light to indicate the closing fault of the shielding door in a preset display mode if the fourth voltage detection unit outputs a high level and / or the fifth voltage detection unit outputs a high level when the shielding door remains in a closed state.

Images