A platform door gap detection system and a control method thereof

Abstract

The application discloses a platform door gap detection system and a control method thereof, which comprises a DCU, an LCB, a safety circuit, a door state indicator lamp and a gap detection device. The DCU starts the gap detection device after detecting that the controlled sliding door is closed. When the gap detection device detects no foreign matter, the safety circuit relay contact of the gap detection device is kept closed, and the safety circuit of the corresponding sliding door is closed. When there is foreign matter, the safety circuit relay contact of the gap detection device is opened, the safety circuit of the corresponding sliding door is opened, the whole side safety circuit is not connected, the DCU controls the door state indicator lamp of the corresponding sliding door to flash, the whole side safety circuit is closed after the foreign matter is removed, and the train can normally depart. When the gap detection device abnormally operates, the corresponding sliding door is isolated through the LCB, the whole side safety circuit is closed, the train can normally depart, the operation is simpler, and the device and the corresponding sliding door can be synchronously isolated when the device abnormally operates, so that the safety is higher.

Description

Technical Field

[0001] This invention belongs to the field of safety protection equipment technology, specifically relating to a platform screen door gap detection system and its control method. Background Technology

[0002] In the operation of rail transit, platform screen doors are generally installed on the platforms to separate the platform from the tracks and to facilitate passenger boarding and alighting. Due to train clearance requirements, platform screen doors often need to maintain a certain distance from the stopping train, creating a gap that can pose safety hazards during operation.

[0003] To improve the safety of rail transit operations, in addition to installing safety baffles on the edges of sliding platform screen doors, a common approach is to use infrared, laser, radar, or video detection to automatically determine whether there are foreign objects between the platform screen door system and the stopping train. In this control method, the gap detection system and the platform screen door system are two separate systems, and the control between the systems depends on the safety circuit status or interlock release status of the platform screen door system. When the detection device malfunctions, the bypass function of the device controller can only bypass the device itself. At this time, the single or multi-stage sliding door corresponding to the device will operate without gap detection, posing a significant safety hazard. At the same time, the operation of the detection device is quite different from the conventional operation of the platform screen door system. In case of an emergency, there is a risk that human error may prolong the emergency response time, leading to delays. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a platform door gap detection system and its control method.

[0005] The specific solution of the present invention is as follows:

[0006] A platform door gap detection system is provided, wherein each sliding door is equipped with a DCU, LCB, safety circuit, door status indicator and gap detection device. The DCU controls the corresponding sliding door to open and close. The DCU at each sliding door also controls the gap detection device at the corresponding sliding door. The status feedback of each gap detection device is transmitted to the DCU of the corresponding sliding door. The DCU transmits the status of the gap detection device to the door status indicator.

[0007] Both the LCB and the safety loop are bidirectionally connected to the DCU. The LCB is connected in parallel across the two ends of the safety loop to bypass the safety loop.

[0008] The safety circuit includes a safety circuit for the sliding door itself and a safety circuit for the gap detection device. The safety circuit for the sliding door itself and the safety circuit for the gap detection device are connected in series. The safety circuit for the sliding door itself is a sliding door detection switch contact. The safety circuit for the gap detection device includes a gap detection relay and a gap detection relay contact. The gap detection relay contact is connected in series with the sliding door detection switch contact.

[0009] The gap detection device is installed on both sides or top of each sliding door. The gap detection control output by the DCU and the status feedback signal of the gap detection device can be implemented by switching quantity or serial communication.

[0010] The door status indicator includes a foreign object detection alarm light and a sliding door opening / closing indicator light, with the foreign object detection alarm light having a higher priority than the sliding door opening / closing indicator light.

[0011] Each sliding door is equipped with a gap detection device control module. The DCU is electrically connected to the gap detection device through the gap detection device control module, which is a microcontroller or a PLC.

[0012] The control method for the gap detection system includes the following steps:

[0013] S1): After the DCU detects that the controlled sliding door is closed, it activates the control authority of the gap detection device and the gap detection relay. The gap detection device feeds back the detection results to the DCU and the gap detection relay. The detection results include no abnormality and abnormality. If there is no abnormality, the gap detection relay contacts remain closed, and the corresponding safety circuit of the sliding door itself is closed. When all foreign object detections on the entire side are normal, the safety circuit on the entire side is closed, and the train departs the station normally. If there is an abnormality, proceed to step S2).

[0014] S2): When the gap detection device detects an abnormality, the gap detection relay contact opens and remains open, the safety circuit of the corresponding sliding door itself is disconnected, the entire side safety circuit is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, and the station personnel on site confirm whether there is a foreign object between the platform door system and the stopped train. If there is a foreign object, open the corresponding sliding door to remove the foreign object, then close the sliding door and proceed to step S1). If there is no foreign object, proceed to step S3).

[0015] S3): If no foreign object is found, it is determined that the gap device itself is abnormal. The gap detection relay contact is open and held, the safety circuit of the corresponding sliding door is disconnected, the safety circuit of the whole side is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, after the station personnel isolate the corresponding sliding door through the LCB, the corresponding sliding door safety circuit is closed, the safety circuit of the whole side is closed, the train can leave the station normally, and the sliding door will no longer open or close.

[0016] When the DCU receives a door closing command, it simultaneously activates the gap detection device while performing the door closing action. When the gap detection device detects an obstacle, the DCU controls the sliding door to stop closing and automatically open. The sliding door closes after the obstacle disappears.

[0017] The detection duration and obstacle duration of the gap detection can be modified through the PSC software. The detection duration of the gap detection is the time from when the sliding door closes until the gap detection device stops working. The obstacle duration is the minimum duration of the obstacle. If the obstacle duration is less than the obstacle duration, the system will not identify it as a foreign object.

[0018] When the gap detection device detects a foreign object, the DCU uploads the data via a communication line to display and record the software alarm.

[0019] The gap detection device has both hardware-forced triggering and program-forced triggering functions. When the gap detection device is under maintenance, it can be triggered as needed by a switch or software to detect the gap detection devices of one or more sliding doors on the entire side. Once triggered, the gap detection device will remain in the triggered state until it is reset by a switch or software.

[0020] This invention discloses a platform screen door gap detection system and its control method, which has the following advantages compared with the prior art:

[0021] 1. The triggering method has been optimized from the original platform door system safety circuit or interlock release state to triggering the gap detection device corresponding to a single sliding door after it is closed, thus providing a more comprehensive detection range.

[0022] 2. The bypass method has been optimized from the original method of bypassing only the gap detection device while the sliding door could still open and close normally, to simultaneously isolating the gap detection device and the sliding door, which is safer.

[0023] 3. The gap detection system is integrated into the platform screen door system, eliminating the need for a separate gap detection host. The gap detection status becomes one of the operating statuses of a single sliding door, making operation simpler. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system structure.

[0025] Figure 2 This is a schematic diagram of a safety circuit.

[0026] Figure 3 This is a schematic diagram of a system structure with a gap detection device control module.

[0027] Figure 4 This is a flowchart of the platform door gap detection and control process. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the implementation of the present invention, and not all of it. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 As shown, a platform door gap detection system is provided. Each sliding door is equipped with a DCU, LCB, safety circuit, door status indicator light and gap detection device. The DCU controls the corresponding sliding door to open and close. The DCU at each sliding door also controls the gap detection device at the corresponding sliding door. The status feedback of each gap detection device is transmitted to the DCU of the corresponding sliding door. The DCU transmits the status of the gap detection device to the door status indicator light.

[0030] Both the LCB and the safety loop are bidirectionally connected to the DCU. The LCB is connected in parallel across the two ends of the safety loop to bypass the safety loop.

[0031] The DCU is the door operator controller, and the LCB is the local control box.

[0032] like Figure 2 As shown, the safety circuit includes a safety circuit for the sliding door itself and a safety circuit for the gap detection device. The safety circuit for the sliding door itself and the safety circuit for the gap detection device are connected in series. If either safety circuit is blocked, the train will be unable to leave the station normally. The safety circuit for the sliding door itself is the sliding door detection switch contact. The safety circuit for the gap detection device includes a gap detection relay and gap detection relay contacts. The gap detection relay contacts are connected in series with the sliding door detection switch contacts.

[0033] The gap detection device is installed on both sides or top of each sliding door. The gap detection control and status feedback signals output by the DCU can be in the form of switch signals or serial communication. The DCU starts the gap detection device after detecting that the controlled sliding door is closed.

[0034] The door status indicator includes a foreign object detection alarm light and a sliding door opening / closing indicator. The foreign object detection alarm light has a higher priority than the sliding door opening / closing indicator. In this embodiment, the status indicator at the sliding door can be two indicator lights or one indicator light. When there are two indicator lights, one is used for foreign object detection alarm and the other is used for sliding door opening / closing indication. When there is only one indicator light, the foreign object detection alarm and the sliding door opening / closing indication can be distinguished according to the flashing frequency of the indicator light, or according to the color displayed by the indicator light.

[0035] When a sliding door malfunctions, the DCU controls the door status indicator light to flash, alerting station personnel to take emergency measures for the fault, and simultaneously uploading gap detection abnormality data to the integrated monitoring system.

[0036] like Figure 3 As shown, each sliding door is equipped with a gap detection device control module. The DCU is electrically connected to the gap detection device through the gap detection device control module, which can be a microcontroller or a PLC. The gap detection device control module performs data conversion between the DCU and different gap detection devices, ensuring system compatibility.

[0037] The gap detection device control module completes the functions of sliding door closing judgment, indicator light control, gap detection control, and gap detection status uploading, which is used to realize the functional transformation of existing lines.

[0038] For those skilled in the art, the current gap detection device solutions are very mature. The gap detection involved in this invention all adopt mature technologies, so the specific gap detection process is not described in detail.

[0039] like Figure 4 As shown, the control method for the gap detection system includes the following steps:

[0040] S1): After the DCU detects that the controlled sliding door is closed, it activates the control authority of the gap detection device and the gap detection relay. The gap detection device feeds back the detection results to the DCU and the gap detection relay. The detection results include no abnormality and abnormality. If there is no abnormality, the gap detection relay contacts remain closed, and the corresponding safety circuit of the sliding door itself is closed. When all foreign object detections on the entire side are normal, the safety circuit on the entire side is closed, and the train departs the station normally. If there is an abnormality, proceed to step S2).

[0041] The gap detection device is activated depending on whether the sliding door is closed. It can be activated when the DCU is powered on again, when the door is remotely opened or closed, or when the door is manually opened or closed, thus providing a higher safety factor.

[0042] For platform screen door systems that use photoelectric switches for sliding door status detection, when the DCU detects that the sliding door's own detection switch is closed and the gap detection device is in normal condition, it controls the safety circuit relay to engage, thus closing the sliding door's safety circuit.

[0043] S2): When the gap detection device detects an abnormality, the gap detection relay contact opens and remains open, the safety circuit of the corresponding sliding door itself is disconnected, the entire side safety circuit is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, and the station personnel on site confirm whether there is a foreign object between the platform door system and the stopped train. If there is a foreign object, open the corresponding sliding door to remove the foreign object, then close the sliding door and proceed to step S1). If there is no foreign object, proceed to step S3).

[0044] S3): If no foreign object is found, it is determined that the gap device itself is abnormal. The gap detection relay contact is open and held, the safety circuit of the corresponding sliding door is disconnected, the safety circuit of the whole side is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, after the station personnel isolate the corresponding sliding door through the LCB, the corresponding sliding door safety circuit is closed, the safety circuit of the whole side is closed, the train can leave the station normally, and the sliding door will no longer open or close.

[0045] When the gap detection device detects an abnormality, regardless of whether the sliding door's safety circuit is normal, the DCU data and door status indicator will both indicate an abnormal gap detection. When the gap detection device detects a normal gap, if the sliding door's safety circuit is abnormal, the DCU data and door status indicator will both indicate a safety circuit abnormality.

[0046] When the DCU receives a door closing command, it simultaneously activates the gap detection device while performing the door closing action. When the gap detection device detects an obstacle, the DCU controls the sliding door to stop closing and automatically open. The sliding door closes after the obstacle disappears.

[0047] The detection duration and obstacle duration of the gap detection can be modified through the PSC software. The detection duration of the gap detection is the time from when the sliding door closes until the gap detection device stops working. The obstacle duration is the minimum duration of the obstacle. If the obstacle duration is less than the obstacle duration, the system will not identify it as a foreign object.

[0048] When the gap detection device detects a foreign object, the DCU uploads the data via a communication line to display and record the software alarm.

[0049] The gap detection device has both hardware-forced triggering and program-forced triggering functions. When the gap detection device is under maintenance, it can be triggered as needed by a switch or software to detect the gap detection devices of one or more sliding doors on the entire side. Once triggered, the gap detection device will remain in the triggered state until it is reset by a switch or software.

[0050] The specific working process of the platform door gap detection system is as follows:

[0051] After passengers have boarded and alighted at the platform, the sliding door closes synchronously with the train door under the control of the signal system. After the DCU of the sliding door on this side detects that the controlled sliding door has closed, the control gap detection device starts to detect.

[0052] When the gap detection device detects no abnormality, it sends a normal gap detection signal to the DCU. The sliding door gap detection relay contacts remain closed. After all the sliding doors on this side have normal gap detection, the platform door system safety circuit is closed, and the train can leave the station normally.

[0053] When the gap detection device detects an abnormality, the safety circuit relay contact of the gap detection device opens and remains open, the safety circuit of the sliding door in this track is disconnected, the safety circuit of the entire side is blocked, the DCU controls the door status indicator light of the corresponding sliding door to flash, and the station personnel determine on-site whether there are foreign objects.

[0054] When a foreign object is present, the corresponding sliding door is opened to remove the foreign object, and then the sliding door is closed. The DCU controls the foreign object detection device to re-detect the foreign object. When the gap detection device detects no abnormality, the safety circuit relay contact of the gap detection device closes, the safety circuit of the sliding door on this track closes, the safety circuit of the entire side closes, and the train can leave the station normally.

[0055] If no foreign object is found, it can be determined that the device itself is malfunctioning. The safety circuit relay contact of the gap detection device will open and remain open, the safety circuit of the sliding door in this track will be disconnected, the safety circuit of the entire side will be blocked, the door status indicator light of the corresponding sliding door controlled by the DCU will flash, and after the station personnel isolate the corresponding sliding door through the LCB, the LCB will bypass the safety circuit of the sliding door, the safety circuit of the sliding door in this track will be closed, the safety circuit of the entire side will be closed, the train can leave the station normally, and at the same time, the sliding door will no longer respond to remote door opening and closing commands.

[0056] The entire emergency response process of this invention is basically the same as the operation of a gapless detection station, making the operation simpler. At the same time, when the device malfunctions, it can be isolated from the corresponding sliding door simultaneously, resulting in higher safety.

[0057] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A platform screen door gap detection system, characterized in that: Each sliding door is equipped with a DCU, LCB, safety circuit, door status indicator light, and gap detection device. The DCU controls the opening and closing of the corresponding sliding door. The DCU at each sliding door also controls the gap detection device at the corresponding sliding door. When a single sliding door is closed, the gap detection device corresponding to that sliding door is triggered. The status feedback of each gap detection device is transmitted to the DCU of the corresponding sliding door, and the DCU transmits the status of the gap detection device to the door status indicator light. Both the LCB and the safety loop are bidirectionally connected to the DCU. The LCB is connected in parallel across the two ends of the safety loop to bypass the safety loop. The safety circuit includes a safety circuit for the sliding door itself and a safety circuit for the gap detection device. The safety circuit for the sliding door itself and the safety circuit for the gap detection device are connected in series. The safety circuit for the sliding door itself is a sliding door detection switch contact. The safety circuit for the gap detection device includes a gap detection relay and a gap detection relay contact. The gap detection relay contact is connected in series with the sliding door detection switch contact.

2. The platform screen door gap detection system according to claim 1, characterized in that: The gap detection device is installed on both sides or top of each sliding door. The gap detection control output by the DCU and the status feedback signal of the gap detection device are transmitted via switch quantity or serial communication.

3. The platform screen door gap detection system according to claim 1, characterized in that: The door status indicator includes a foreign object detection alarm light and a sliding door opening / closing indicator light, with the foreign object detection alarm light having a higher priority than the sliding door opening / closing indicator light.

4. The platform screen door gap detection system according to claim 1, characterized in that: Each sliding door is equipped with a gap detection device control module. The DCU is electrically connected to the gap detection device through the gap detection device control module, which is a microcontroller or a PLC.

5. The control method for the platform door gap detection system according to any one of claims 1 to 4, characterized in that: Includes the following steps, S1): After the DCU detects that the controlled sliding door is closed, it activates the control authority of the gap detection device and the gap detection relay. The gap detection device feeds back the detection results to the DCU and the gap detection relay. The detection results include no abnormality and abnormality. If there is no abnormality, the gap detection relay contacts remain closed, and the corresponding safety circuit of the sliding door itself is closed. When all foreign object detections on the entire side are normal, the safety circuit on the entire side is closed, and the train departs the station normally. If there is an abnormality, proceed to step S2). S2): When the gap detection device detects an abnormality, the gap detection relay contact opens and remains open, the safety circuit of the corresponding sliding door itself is disconnected, the entire side safety circuit is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, and the station personnel on site confirm whether there is a foreign object between the platform door system and the stopped train. If there is a foreign object, open the corresponding sliding door to remove the foreign object, then close the sliding door and proceed to step S1). If there is no foreign object, proceed to step S3). S3): If no foreign object is found, it is determined that the gap device itself is abnormal. The gap detection relay contact is open and held, the safety circuit of the corresponding sliding door is disconnected, the safety circuit of the whole side is not connected, the DCU controls the door status indicator light of the corresponding sliding door to flash, after the station personnel isolate the corresponding sliding door through the LCB, the corresponding sliding door safety circuit is closed, the safety circuit of the whole side is closed, the train can leave the station normally, and the sliding door will no longer open or close.

6. The control method for the platform door gap detection system according to claim 5, characterized in that: When the DCU receives a door closing command, it simultaneously activates the gap detection device while performing the door closing action. When the gap detection device detects an obstacle, the DCU controls the sliding door to stop closing and automatically open. The sliding door closes after the obstacle disappears.

7. The control method for the platform door gap detection system according to claim 5, characterized in that: The detection duration and obstacle duration of the gap detection can be modified through the PSC software. The detection duration of the gap detection is the time from when the sliding door closes until the gap detection device stops working. The obstacle duration is the minimum duration of the obstacle. If the obstacle duration is less than the obstacle duration, the system will not identify it as a foreign object.

8. The control method for the platform door gap detection system according to claim 5, characterized in that: When the gap detection device detects a foreign object, the DCU uploads the data via a communication line to display and record the software alarm.

9. The control method for the platform door gap detection system according to claim 5, characterized in that: The gap detection device has both hardware-forced triggering and program-forced triggering functions. When the gap detection device is under maintenance, it can be triggered as needed by a switch or software to detect the gap detection devices of one or more sliding doors on the entire side. Once triggered, the gap detection device will remain in the triggered state until it is reset by a switch or software.

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