Device for detecting foreign matters between shielding door and train

Abstract

The utility model belongs to the technical field of traffic safety, and particularly relates to a device for detecting foreign matters between a shielding door and a train, which comprises a radar probe and a receiver which are arranged at an interval, a closed door slot of two door leaves of the shielding door or a train door is positioned between the radar probe and the receiver, and the receiver is electrically connected with an alarm element. Influences of in-station wind disturbance, tiny dust particles and in-station lamplight on transmission of detection waves are small, and the reliability of foreign matter detection can be greatly improved by applying the radar probe and the receiver to perform foreign matter detection. When the foreign matter exists between the shielding door and the train, the detection wave sent by the radar probe is blocked, the propagation path of the detection wave changes accordingly, the detection wave information collected by the receiver is obviously different from the foreign matter-free state, and then an instruction is sent out to drive the alarm element to send out an alarm signal, so that the existence of the foreign matter can be timely and effectively warned.

Description

Technical Field

[0001] The utility model belongs to the technical field of traffic safety, and particularly relates to a foreign body detection device between a screen door and a train. Background Art

[0002] Subway has become the first choice for people's travel due to its convenience and speed. During rush hour, carriages and platforms are very crowded, and people or their clothes and belongings are often caught between the doors and platform screen doors, resulting in accidents that endanger the safety of passengers or property. In order to eliminate safety hazards and ensure the safe and stable operation of the subway, subway companies currently usually use foreign body detection methods such as manual detection and optical detection. Among them, manual detection requires the subway driver to observe the light band in the gap between the rear train and the platform from the front of the train. This detection method cannot identify small items and cannot be applied to curved platforms. It still has a high risk of accidents. During the peak period of subway operation, the station often arranges staff to check the carriage doors in turn, and the manpower and time costs required are too high. Optical detection requires the installation of infrared detectors or image acquisition devices and their auxiliary equipment at the screen door or door, but due to factors such as train vibration at the platform, lighting and dust in the station, its detection accuracy is poor, false alarms are prone to occur, and the equipment maintenance cost is high. Utility Model Content

[0003] The utility model aims to provide a foreign body detection device between a platform screen door and a train, which can effectively avoid the occurrence of false alarms caused by the platform environment.

[0004] To achieve the above objectives, the technical solution adopted by the utility model is: a foreign object detection device between a shield door and a train, including a radar probe and a receiver arranged at intervals, the closed door gap of the two door leaves of the shield door or the train door is located between the radar probe and the receiver, and the receiver is electrically connected to the alarm element.

[0005] Wind disturbances, tiny dust particles and lights in the station have little effect on the transmission of detection waves. The utility model uses radar probes and receivers to detect foreign objects, which can greatly improve the reliability of foreign object detection. When there is a foreign object between the screen door and the train, the detection wave emitted by the radar probe is blocked, and the propagation path of the detection wave changes accordingly. The detection wave information collected by the receiver will also be significantly different from the state without foreign objects, and then send out instructions to drive the alarm element to send out an alarm signal, so as to timely and effectively warn of the presence of foreign objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The following is a brief description of the contents and symbols in the drawings of this specification:

[0007] Figure 1 is a schematic diagram of embodiment 1;

[0008] Figure 2 is a schematic diagram of Embodiment 2;

[0009] Figure 3 is a schematic diagram of Embodiment 3;

[0010] Figure 4 is a schematic diagram of Embodiment 4;

[0011] Figure 5 It is a schematic diagram of Embodiment 5. DETAILED DESCRIPTION

[0012] The specific implementation of the utility model is further described in detail below through the description of embodiments in conjunction with the accompanying drawings.

[0013] A foreign body detection device between a screen door and a train, in order to accurately identify whether there is a foreign body between the screen door and the train, it is necessary to arrange a radar probe 10 and a receiver 20 on both sides of the screen door 1 or the train door 2 that are arranged relatively. After the radar probe 10 sends out a detection wave, the receiver 20 collects the detection wave, and uses the phenomenon that the detection wave is blocked by an obstacle to detect the strength of the detection wave signal and the obstruction of the flight time within a fixed distance to reflect the change of the detection wave path, so as to analyze the size, spatial position and texture of the obstacle object encountered by the detection wave in the detection area. When the detection wave collected by the receiver 20 is significantly different from the state without foreign bodies, a command is sent to the alarm element electrically connected thereto, and the alarm element emits a buzzer or lights up a warning light, which can promptly warn the staff to conduct an investigation, thereby ensuring driving safety.

[0014] The closed gap of the door leaf is a key detection area for foreign objects. To ensure the reliability of detection, the closed gap of the door leaf should be located between the radar probe 10 and the receiver 20.

[0015] One radar probe 10 and two or more receivers 20 form a foreign body detection group. To detect foreign objects between the platform screen door and the train, it is necessary to monitor the open area of ​​the platform screen door leaf. Therefore, in this embodiment, the radar probe 10 and the receiver 20 of the same foreign body detection group should be placed on both sides of the platform screen door 1 or the train door 2. Using multiple foreign body detection groups to work together, the components include the space between the platform screen door 1 and the train in the detection area, which can effectively ensure driving safety.

[0016] Attached Figure 1In the embodiment shown, the radar probe 10 and the receiver 20 are respectively placed above and below the shielding door 1. In this embodiment, the radar probe 10 is arranged above the shielding door 1, and four receivers 20 are arranged on the ground of the platform 3 between the shielding door 1 and the train. The passenger walking area is located inside the area formed by the four receivers 20 connected in sequence. When there is a foreign object between the transmission path of the radar probe 10 and the receiver 20, the direct wave collected by the receiver 20 decreases and the reflected wave increases, so that the presence of the foreign object can be identified. In this embodiment, the radar probe 10 is located above the closed door gap of the shielding door 1, and the detection wave is emitted vertically downward, which can ensure the effective identification of foreign objects sandwiched in the door gap.

[0017] Further preferred solutions are as follows Figure 2 As shown, there are two foreign body detection groups, one of which is connected to the attached Figure 1 The embodiment shown is similar, but its radar probe 10 is arranged on the upper left side of the platform 1 through a frame, and is arranged near the edge of the platform 3. The radar probe 10 of another foreign body detection group is arranged at the bottom right side of the platform 1, and the receiver 20 is arranged on the upper part of the door body of the platform 1 through a frame, and the area enclosed by the receivers 20 in sequence includes the area above the passenger walking area. The receivers 20 of the two foreign body monitoring groups are arranged obliquely relative to each other, which can expand the detection range, thereby enhancing the accuracy and reliability of foreign body detection at the door gap of the platform 1 and the area facing the train. In this embodiment, for ease of arrangement, the receivers 20 of the same group are arranged in the same plane. In other embodiments, their installation positions can be adjusted as needed.

[0018] In the above scheme, the radar probe 10 or the receiver 20 arranged on the platform 3 floor has the risk of being stepped on by passengers, damaged by dust particles, and sewage, and the accuracy of identifying objects dropped or lost by passengers on the platform floor is difficult to guarantee. For this reason, a foreign body detection group can be set up or added on the basis of the above scheme. The new foreign body monitoring group is arranged as follows Figure 3As shown, a radar probe 10a is provided on one side of the shielding door 1, and four receivers 20a are arranged at equal intervals in the height direction of the door body on the other side. The radar probe 10a emits detection waves facing the side where the receiver 20a is located. The receivers 20a at different heights can collect the foreign matter within the height range where they are located. Multiple receivers are evenly arranged in the height direction to ensure the accuracy of foreign matter detection at each height. In other embodiments, the receivers 20a can also be arranged densely according to needs. In the preferred embodiment, the radar probe 10a and the receiver 20a are arranged on the door body of the shielding door 1, and detection is performed when the shielding door 1 is in a closed state. When a foreign matter is clamped in the closed door gap of the shielding door 1, the distance between the radar probe 10a and the receiver 20a may change, so that the time for the receiver 20a to receive the detection wave changes, and the waveform of the detection wave transmitted to the receiver 20a after encountering a foreign matter and being blocked will also change significantly, so that the position, size, general shape and type of the foreign matter can be identified. The radar probe 10a and the receiver 20a need to be installed on the existing screen door 1. The power supply and communication cables need to be laid out at the same time. If the power supply and communication cables are attached to the screen door 1, they need to be repeatedly folded and moved, which will greatly reduce the service life of the cables. Therefore, in another embodiment, the radar probe 10a and the receiver 20a can be installed on the door frame of the screen door 1 facing the train. Figure 5 As shown, a pole 1 31 may be provided on one side of the platform 3 and a pole 2 32 may be provided on the other side of the shielding door 1. The pole 1 31 may be provided with a radar probe 10a, and the pole 2 32 may be provided with four receivers 20a at equal intervals along the length of the pole.

[0019] To detect whether there is foreign matter at the train door 2, Figure 4 As shown, a radar probe 10b can be arranged on one side of the train door 2, and four receivers 20b can be arranged at intervals in the height direction of the door body on the other side. The radar probe 10b and the receiver 20b can also be arranged on the door body or door frame of the train door 2 according to needs. When they are arranged on the door body of the train door 2, the cables of the radar probe 10b and the receiver 20b can be led out through the same passage as the power supply cable of the motor driving the door body.

[0020] When foreign body detection groups are provided on both sides of the platform screen door 1 and the train door 2, as shown in the attached Figure 3 , 4As shown, when the train stops, the door bodies of the screen door 1 and the train door 2 are arranged relative to each other, the radar probe 10a and the receiver 20b are located on the same side of the door bodies of the screen door 1 and the train door 2, and the receiver 1 20a and the radar probe 2 10b are located on the same side of the door bodies of the screen door 1 and the train door 2. In the preferred embodiment, the receiver 2 20b is electrically connected to the signal transmission element, and after the signal transmission element obtains the detection wave information uploaded by the receiver 2 20b, it uploads it to the control module of the first foreign body detection group, or the receiver 2 20b uploads the foreign body detection information through the signal transmission element and the alarm element, and the receiver 1 20a and the receiver 2 20b are connected to the same alarm element, so that the detection wave collected by any receiver indicates the presence of foreign matter, and a warning can be issued in time. The radar probe 2 10b and the receiver 2 20b are electrically connected to the signal transmission element, and the signal transmission element, the alarm element, the radar probe 10a, and the receiver 1 20a are electrically connected to the control module. When performing foreign object detection, after radar probe 10a sends out a detection wave, receiver 1 20a and receiver 2 20b receive the detection wave, so that the propagation path of the detection wave can be detected more comprehensively, thereby providing more comprehensive analysis data for foreign object detection.

[0021] The cost of deploying a foreign object detection group at each train door 2 and platform door 1 is high and the maintenance is difficult. Figure 5 As shown, a pole 1 31 is provided on one side of the platform 3 and a pole 2 32 is provided on the other side. A radar probe 10a is provided on the pole 1 31, and four receivers 1 20a are evenly arranged on the pole 2 32 along the pole length direction. Meanwhile, a radar probe 2 10b is provided on the pole 2 32, and four receivers 20b are evenly arranged on the pole 1 31 along the pole length direction. The radar probe 10a, the receiver 1 20a, the radar probe 2 10b, the receiver 20b and the alarm element are electrically connected to the control module respectively. All components of the foreign body detection device are arranged at the platform 3, so the arrangement difficulty is relatively low and the signal transmission is more reliable.

[0022] In order to detect the size and spatial position of foreign objects, the radar probe 10 in this embodiment is an ultrasonic radar that integrates transmission and reception, and its receiving circuit is a linear amplifier with controllable gain, low distortion and large dynamic range. The controllable gain of the receiving circuit can not only linearly receive large-amplitude direct ultrasonic waves, but also sensitively detect the field strength of weak-amplitude ultrasonic reflection waves when blocked. The receiver 20 outputs a level signal converted by the envelope detection method. By comparing the detection level of the receiving probes at different positions, the changes in different level values ​​when blocked, and the time difference corresponding to the sound wave path at the peak level, the size and relative coordinate position of the suspicious objects appearing in the detection area can be calculated.

[0023] In order to improve the foreign body recognition capability, multiple foreign body detection groups should be set between the shield door 1 and the train body. First, the probe single-shot mode is used for detection, that is, each foreign body detection group performs foreign body detection operations in turn. When any of the foreign body detection groups recognizes the presence of foreign bodies, the detection mode is changed to a multiple probe take turns to transmit mode, forming a multi-angle surrounding wave detection. After the radar probe 10 and the receiver 20 are installed, the radar probe 10 and each receiver 20 respectively construct a coordinate system, and calibrate them in turn when there are no foreign bodies in the area to be detected, thereby constructing a foreign body detection device capable of detecting the spatial position of foreign bodies. When there is a foreign body between the shield door 1 and the train door 2, it will inevitably cause the detection wave collected by the receiver 20 to be abnormal. By analyzing and calculating the level strength changes caused by the direct waves and reflected waves collected by the receivers 20 at different installation positions and the changes in the peak arrival time of the detection wave, the size, shape and position of the foreign body can be converted.

[0024] The above provides several embodiments of the arrangement of the radar probe 10 and the receiver 20, and the arrangement position can be adjusted according to the needs. The following takes two foreign body detection groups consisting of two radar probes 10 and eight receivers 20 as an example for explanation. Figure 5 As shown, radar probe 10a and four receivers 20a form a group, and radar probe 2 10b and four receivers 20b form a group. When there is no foreign matter between the shielding door 1 and the train door 2, the radar probe 10a sends out a detection wave, and the receiver 10a receives all direct waves, and the verticality and acquisition time of its peak level are fixed. When there is a foreign matter between the shielding door 1 and the train door 2, after the radar probe 10a sends out a detection wave, the receiver 20a whose propagation path is not blocked by the foreign matter still collects the direct wave, and the receiver 20a whose propagation path is blocked by the foreign matter collects the reflected wave reflected by the foreign matter. The transmission path of the reflected wave is different from that of the direct wave, and the time when the receiver 20a collects the reflected wave is later than the time when the direct wave is collected. By collecting the time difference of the detection wave and the level change of the collected detection wave, the size, position and texture of the foreign matter can be analyzed. After the first foreign body detection group detects the presence of foreign bodies between the screen door 1 and the train door 2, in order to further identify foreign bodies, the control module issues a command to drive the second foreign body detection group to work. The wave transmission angle of the radar probe 2 10b of the second foreign body detection group is different from that of the radar probe 1 10a. The direct wave and reflected wave intensity, time difference variables and other values ​​obtained by the two foreign body detection groups are combined and calculated to further improve the accuracy of foreign body judgment. Furthermore, when the radar probe 10 emits a detection wave, all receivers of the two foreign body detection groups work at the same time, and the direct and reflected signals of the foreign body in all directions can be obtained, which can provide more analysis data for foreign body detection and thus improve the accuracy and reliability of detection.

[0025] When there are two foreign body detection groups, the following detection methods can be used:

[0026] A. After the foreign object detection device is installed, the radar probe 10 transmits detection waves in the state without foreign objects, and records the detection wave signals collected by each receiver 20;

[0027] B. When the screen door 1 and the train door 2 are both in the closed state, the control module sends a command to the radar probe 10a, the radar probe 10a sends a detection wave, and the receiver 1 20a or the receiver 1 20a and the receiver 2 20b collect the detection wave;

[0028] C. If the detection wave signal collected by the receiver 20 is consistent with the recorded detection wave signal of the state without foreign objects, the detection result of no foreign objects is sent to the control module. The control module first sends an instruction to the radar probe 2 10b, and the radar probe 2 10b sends a detection wave. The receiver 20b or the receiver 1 20a and the receiver 2 20b collect the detection wave. If the detection wave signal collected by the receiver 20 is consistent with the recorded detection wave signal of the state without foreign objects, the detection result of no foreign objects is sent to the control module and the detection is ended.

[0029] If the detection wave signal collected by the receiver 20 is different from the state of no foreign matter, the inspection result of the presence of foreign matter is sent to the control module, and the process goes to step D;

[0030] D. The control module first sends a command to the radar probe 10b, the radar probe 10b sends out a detection wave, and the receiver 20b or the receiver 1 20a and the receiver 20b collect the detection wave. The control module then sends a command to the radar probe 10a, the radar probe 10a sends out a detection wave, and the receiver 20b or the receiver 1 20a and the receiver 20b collect the detection wave. If the detection wave signal collected by the receiver 20 at any time does not match the recorded detection wave signal of the no foreign object state, the control module sends an alarm command to the alarm component.

Claims

1. A foreign body detection device between a platform screen door and a train, characterized in that: The invention comprises a radar probe (10) and a receiver (20) arranged at intervals, wherein the closed door gap between two door leaves of a shielding door (1) or a train door (2) is located between the radar probe (10) and the receiver (20), and the receiver (20) is electrically connected to an alarm element.

2. The device for detecting foreign matter between a platform screen door and a train according to claim 1, characterized in that: The radar probe (10) and the receiver (20) arranged on opposite sides of the screen door (1) or the train door (2) form a foreign body detection group, and two or more foreign body detection groups are arranged on the peripheral side of the screen door (1) or the train door (2).

3. The device for detecting foreign matter between a platform screen door and a train according to claim 2, characterized in that: The foreign object detection group comprises two or more receivers (20), and the receivers (20) in the same group are arranged in the same plane or the receivers (20) in the same group are arranged at intervals in the height direction of the door body.

4. The device for detecting foreign matter between a platform screen door and a train according to claim 1, 2 or 3, characterized in that: The radar probe (10) and the receiver (20) are disposed on two opposite sides of a train door (2) or a screen door (1).

5. The device for detecting foreign matter between a platform screen door and a train according to claim 4, characterized in that: A radar probe (10a) is provided on one side of the shielding door (1), and four receivers (20a) are arranged at intervals in the height direction of the door body on the other side. The radar probe (10a) and the receiver (20a) are arranged on the door body or door frame of the shielding door (1); A second radar probe (10b) is provided on one side of a train door (2), and four second receivers (20b) are arranged at intervals in the height direction of the door body on the other side. The second radar probe (10b) and the second receiver (20b) are arranged on the door body or door frame of the train door (2).

6. The device for detecting foreign matter between a platform screen door and a train according to claim 4, characterized in that: A vertical pole (31) is provided on one side of a platform (3) upper screen door (1), and a vertical pole (32) is provided on the other side. A radar probe (10a) is provided on the vertical pole (31), and four receivers (20a) are provided on the vertical pole (32) at intervals along the length of the pole.

7. The device for detecting foreign matter between a platform screen door and a train according to claim 6, characterized in that: A radar probe 2 (10b) is arranged on the second vertical pole (32), and four receivers 2 (20b) are arranged on the first vertical pole (31) at intervals along the length direction of the pole.

8. The device for detecting foreign matter between a platform screen door and a train according to claim 4, characterized in that: The radar probe (10) is arranged above the screen door (1), and the receiver (20) is arranged on the ground of the platform (3), or the radar probe (10) is arranged on the ground of the platform (3), and the receiver (20) is arranged above the screen door (1), and the radar probe (10) is located above or below the closed door gap of the screen door (1) and its detection wave emission direction is arranged vertically.

9. The device for detecting foreign matter between a platform screen door and a train according to claim 4, characterized in that: The radar probe (10) is an ultrasonic radar integrating transmission and reception. The receiving circuit of the radar probe (10) comprises a linear amplification circuit; and the receiver (20) outputs a level signal.

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