Subway platform screen door gap safety monitoring device
By installing a single-line lidar system in the gap of subway platform screen doors, the problems of small detection range and high cost of existing devices have been solved, enabling rapid and accurate identification and safety monitoring of foreign objects, and improving the reliability and detection accuracy of the system.
Patent Information
- Application Number
- CN202520383136.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Existing subway platform screen door gap safety monitoring devices have a small detection range, are greatly affected by ambient light and dust, make it difficult to accurately identify small foreign objects, and have high equipment costs, which limits their application.
A safety monitoring device based on single-line lidar is adopted, including an industrial all-in-one machine, a switch and multiple lidars, to achieve high-precision scanning of the gap between the train and the platform screen door. The industrial all-in-one machine controls the lidar to scan after the platform screen door is closed, and the data is transmitted through the switch to achieve rapid and accurate identification of foreign objects.
It enables high-precision scanning of the entire area of the platform screen door gap within 1-2 seconds before the train leaves the station, quickly identifying foreign objects of various sizes, reducing equipment costs, and improving system reliability and detection accuracy.
Smart Images
Figure CN223897645U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rail transit operation safety, and in particular to a safety monitoring device for the gap between subway platform screen doors. Background Technology
[0002] Urban rail transit is the backbone of urban public transportation systems and an important component of urban integrated transportation systems. Its safe operation is of great significance for protecting the lives and property of the people and maintaining social stability. In urban rail transit, the area between the platform screen doors and the train doors is a high-risk area. If foreign objects (such as passengers, child safety ropes, backpacks, luggage, etc.) enter this area, it can not only cause train delays but may also lead to serious accidents that endanger the personal safety of passengers. Therefore, safety monitoring of the gap between subway platform screen doors is essential.
[0003] Currently, existing subway platform screen door gap safety monitoring typically employs technologies such as infrared light curtain illumination and camera image recognition. However, these existing monitoring technologies have the following shortcomings: limited detection range, significant susceptibility to ambient light and dust from the gate shoes, poor detection accuracy, and inability to accurately identify small foreign objects (such as child safety ropes). Furthermore, each subway platform screen door requires its own safety monitoring device, resulting in high installation and maintenance costs. These shortcomings severely impact and limit the application of existing subway platform screen door gap safety monitoring devices.
[0004] Therefore, it is evident that the existing subway platform screen door gap safety monitoring devices still have inconveniences and shortcomings, and urgently need further improvement. The question is how to create a new subway platform screen door gap safety monitoring device that, based on single-line lidar technology, can quickly and accurately identify foreign objects of various sizes, is simple and convenient, has high detection accuracy, and low cost, thus overcoming the deficiencies of existing subway platform screen door gap safety monitoring devices. Utility Model Content
[0005] The technical problem to be solved by this utility model is to provide a safety monitoring device for the gap between subway platform screen doors, which can perform high-precision lidar scanning of the area between the train and the platform screen doors within 1-2 seconds after the subway platform screen doors close and before the train leaves the station based on single-line lidar technology. This enables rapid and accurate identification of foreign objects of various sizes, ensuring the safety of passengers and train operation. It is simple and convenient, has high detection accuracy, and low cost, thereby overcoming the shortcomings of existing safety monitoring devices for the gap between subway platform screen doors.
[0006] To solve the above-mentioned technical problems, this utility model provides a subway platform screen door gap safety monitoring device, including an industrial integrated machine, a switch and a lidar connected in sequence. The lidar includes multiple lidars, all of which are connected to the switch. Each lidar is used to scan the warning area of n consecutive subway platform screen door gaps, where n≥2.
[0007] The lidar is a single-line lidar, installed directly above the center of the gap between the subway platform screen door and the train door in the corresponding warning area, at a height of 2.5 to 5 meters above the platform ground. Each lidar is used to scan the corresponding warning area and transmits the scanning results to the industrial all-in-one machine through the switch.
[0008] The industrial all-in-one machine and the switch are installed on the side wall of the subway platform at the position where the train head stops. The industrial all-in-one machine is used to control multiple lidars to perform lidar scanning after the subway platform doors are closed, and to receive lidar scanning data and issue alarms for abnormal data.
[0009] Further improvements include enabling each lidar to scan an expanded warning area of 2n consecutive subway platform screen door gaps. When an adjacent lidar malfunctions, the industrial integrated machine controls an expanded scan of 0.5n subway platform screen door gaps adjacent to its warning area.
[0010] Further improvements were made, with n=4.
[0011] Further improvements include setting the height of the lidar above the platform ground to 3-4 meters.
[0012] Further improvements include the adoption of an industrial control computer with touch functionality, and the addition of both automatic and manual scanning modes.
[0013] Further improvements include the adoption of a low-latency, high-bandwidth industrial switch that supports adaptive transmission at 10M / 100M / 1000M speeds. The switch has one WAN port for connecting to the industrial all-in-one machine and at least eight LAN ports for connecting to multiple LiDARs one by one.
[0014] Further improvements include that the switch supports dual power supply redundancy, with one channel using a Phoenix terminal block and the other using a DC socket.
[0015] A further improvement includes a power conversion module for supplying power to the switch and the lidar, the power conversion module being connected to the switch and the lidar respectively via shielded twisted-pair cables.
[0016] With this design, the present invention has at least the following advantages:
[0017] 1. This utility model relates to a subway platform screen door gap safety monitoring device based on laser scanning detection using multiple high-precision single-line lidars. It can complete a high-precision lidar scan of the entire area between the train and the platform screen doors within 1-2 seconds after the doors close and before the train departs the station. This enables rapid and accurate identification of foreign objects of various sizes in each warning area and precise location of the object, providing strong support for quickly eliminating hazards and ensuring the safety of passengers and train operation. The high-precision single-line lidar has a long detection range, strong anti-interference capability, and can scan multiple platform screen door areas simultaneously, effectively reducing hardware costs. The subway platform screen door gap safety monitoring device consists of an industrial integrated machine, a switch, and multiple lidars connected in sequence. It has a simple structure, is easy to install, has high detection accuracy, and low equipment use and maintenance costs.
[0018] 2. Furthermore, by utilizing the long detection range of a single high-precision single-line lidar, a synergistic effect is formed among the lidars, which promptly compensates for the drawback of not being able to detect the warning area after the failure of an individual lidar. This ensures that the entire safety monitoring device is not affected by the failure of an individual lidar, greatly improving the system's reliability. Attached Figure Description
[0019] The above is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, the following describes this utility model in further detail with reference to the accompanying drawings and specific embodiments.
[0020] Figure 1 This is a schematic diagram of the structural composition of the subway platform screen door gap safety monitoring device of this utility model.
[0021] Figure 2 This is a schematic diagram of the installation position of the laser radar in the subway platform screen door gap safety monitoring device of this utility model.
[0022] Figure 3 This is a top view of the installation location of the lidar in the subway platform screen door gap safety monitoring device of this utility model. Detailed Implementation
[0023] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0024] This utility model relates to a laser radar-based subway platform screen door gap safety monitoring device, applied in the field of urban rail transit. One set of the aforementioned subway platform screen door gap safety monitoring device is installed in each station in both the up and down directions, effectively ensuring the safe operation of urban rail transit. Specific embodiments are as follows.
[0025] See attached document Figure 1 As shown, the subway platform screen door gap safety monitoring device in this embodiment includes an industrial all-in-one machine, a switch, multiple lidar sensors, and a power conversion module.
[0026] The industrial all-in-one machine is connected to a switch via a network cable, and the switch is then connected to multiple lidar sensors via network cables. Thus, the industrial all-in-one machine, the switch, and the multiple lidar sensors constitute a data transmission network. The power conversion module supplies power to the switch and the multiple lidar sensors, ensuring the normal operation of the subway platform screen door gap safety monitoring device.
[0027] Specifically, the industrial all-in-one machine uses an existing industrial control computer with touch functionality, requiring stable operation without power interruption for extended periods. Its main function is to control multiple lidar sensors to perform lidar scanning after the subway platform screen doors close, receive lidar scan data, and issue alarms for abnormal data, notifying platform staff for rapid investigation and handling. The industrial all-in-one machine utilizes multi-threading technology, automatically matching the number of threads based on the number of lidar sensors. Each thread receives data from one lidar sensor, ensuring real-time data reception. The industrial all-in-one machine is configured with two operating modes for controlling the lidar sensors: "automatic scanning" and "manual scanning." Automatic scanning means the lidar scanning program is automatically started after the platform screen doors close, while manual scanning means the operator manually starts the lidar scanning program after the platform screen doors close, to accommodate various operating conditions.
[0028] In this embodiment, the industrial all-in-one machine is installed on the side wall of the subway platform at the train's locomotive stop, using a wall-mounted installation method to save installation space and facilitate driver access and operation after disembarking. More specifically, the industrial all-in-one machine uses a screen no smaller than 32 inches, a 16:9 high-definition LCD screen with a resolution of 1920*1080. The machine has at least 8GB of RAM, a 512GB solid-state drive, an i9 processor, two Ethernet ports, two USB ports, and 4G / 5G wireless communication capabilities.
[0029] The switch is a low-latency, high-bandwidth industrial switch, supporting adaptive transmission at 10M / 100M / 1000M speeds to ensure efficient and real-time data transmission. In this embodiment, the switch has one WAN port and at least eight LAN ports. The WAN port is used to connect to the industrial all-in-one machine, and each LAN port is used to connect to one LiDAR. The switch uses an aluminum alloy casing, which is not only robust and durable but also provides excellent heat dissipation and corrosion resistance. The switch supports dual power supply redundancy, with one power supply using Phoenix terminal blocks and the other using a DC socket, ensuring normal operation even if one power supply fails. The switch supports a wide temperature range, capable of stable operation in extreme temperature environments from -40℃ to 85℃, with an IP40 protection rating or higher, adapting to harsh industrial environments.
[0030] The lidar used is a high-precision single-line lidar, such as the N301-P. In this embodiment, the single-line lidar is installed directly above the center of the gap between the subway platform screen doors and train doors in the corresponding warning area, at a height of 2.5–5m above the platform ground, preferably 3–4m. Each single-line lidar can scan the fan-shaped area below it; for example, in this embodiment, each single-line lidar can cover four platform screen door areas. The lidar installation position is shown in the attached figure. Figure 2 and 3 As shown, it is located directly above the center point of the four platform screen door areas. Under normal operating conditions, each of the single-line lidars is responsible for scanning the warning area of the gaps between the four consecutive subway platform screen doors, and transmitting the scanning results to the industrial control computer through the switch. This enables high-precision lidar scanning of the entire area between the train and the platform screen doors within 1-2 seconds after the subway platform screen doors close and before the train departs the station, ensuring the safe operation of the subway station.
[0031] In a preferred embodiment, each lidar can scan an expanded warning area for eight consecutive subway platform screen door gaps. When an adjacent lidar fails, the industrial integrated machine controls the expanded scan of the two subway platform screen door gaps adjacent to its warning area. This compensates for the inability to detect the warning area after a single lidar failure, creating synergy among the lidars and ensuring the entire safety monitoring device is unaffected by individual lidar failures, thus improving system reliability. The manual start function of the industrial integrated machine can be used when an expanded warning area scan is needed.
[0032] The single-line lidar described in this embodiment operates at DC 16-60V, with a light source wavelength of 905nm. It has a maximum detection distance of 50 meters and an effective detection angle of ±90 degrees, enabling effective identification of millimeter-sized objects (such as child safety ropes). It boasts high detection accuracy and a long detection range. The lidar's scanning motor rotates at a speed of no less than 30Hz, and its output interfaces include one Ethernet interface, one RS-485 interface, and one CAN interface to ensure accurate detection result output. The lidar has an IP65 protection rating.
[0033] The output of the power conversion module is connected to the switch and each LiDAR unit via shielded twisted-pair cables. In this embodiment, the rated input of the power conversion module is DC220V or AC220V, with an allowable voltage range of 110V-370V; the rated output voltage is DC24V or DC48V, with an output voltage accuracy of ±2%, a rated output current of 10A, a rated power of 240W, and a power efficiency of 93%. Of course, the specific output voltage value can be configured according to the needs of the switch and LiDAR units.
[0034] This utility model of a subway platform screen door gap safety monitoring device is based on the high-precision, long-range detection characteristics of a single-line lidar. It can achieve early warning coverage of n to 2n subway platform screen door gaps by a single lidar. Not only does it offer high detection accuracy and rapid, accurate identification of foreign objects of various sizes in each early warning area, but it also significantly reduces hardware costs. Even better, it enables mutual coordination among the lidars, promptly compensating for the inability to detect early warning areas when individual lidars fail. This ensures the entire safety monitoring device is unaffected by the failure of individual lidars, greatly improving system reliability and making it suitable for widespread application.
[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent changes or alterations made by those skilled in the art using the above-disclosed technical content shall fall within the protection scope of the present utility model.
Claims
1. A safety monitoring device for the gap between subway platform screen doors, characterized in that, The system includes an industrial all-in-one machine, a switch, and a lidar connected in sequence. The lidar includes multiple lidars, all of which are connected to the switch. Each lidar is used to scan the warning area of n consecutive gaps in subway platform screen doors, where n≥2. The lidar is a single-line lidar, installed directly above the center of the gap between the subway platform screen door and the train door in the corresponding warning area, at a height of 2.5 to 5 meters above the platform ground. Each lidar is used to scan the corresponding warning area and transmits the scanning results to the industrial all-in-one machine through the switch. The industrial all-in-one machine and the switch are installed on the side wall of the subway platform at the position where the train head stops. The industrial all-in-one machine is used to control multiple lidars to perform lidar scanning after the subway platform doors are closed, and to receive lidar scanning data and issue alarms for abnormal data.
2. The subway platform screen door gap safety monitoring device according to claim 1, characterized in that, Each of the aforementioned lidars can perform an expanded warning area scan of 2n consecutive subway platform screen door gaps. When an adjacent lidar malfunctions, the industrial integrated machine controls the expanded scan of 0.5n subway platform screen door gaps adjacent to its warning area.
3. The subway platform screen door gap safety monitoring device according to claim 2, characterized in that, n=4。 4. The subway platform screen door gap safety monitoring device according to claim 3, characterized in that, The lidar is located 3-4 meters above the platform.
5. The subway platform screen door gap safety monitoring device according to claim 1, characterized in that, The industrial all-in-one machine uses an industrial control computer with touch function and has two working modes: automatic scanning and manual scanning.
6. The subway platform screen door gap safety monitoring device according to claim 1, characterized in that, The switch is a low-latency, high-bandwidth industrial switch that supports adaptive transmission at 10M / 100M / 1000M speeds. The switch has one WAN port for connecting to the industrial all-in-one machine and at least eight LAN ports for connecting to multiple LiDARs one by one.
7. The subway platform screen door gap safety monitoring device according to claim 6, characterized in that, The switch supports dual power supply redundancy, with one channel using a Phoenix terminal block and the other using a DC socket.
8. The subway platform screen door gap safety monitoring device according to any one of claims 1 to 7, characterized in that, It also includes a power conversion module for supplying power to the switch and the lidar, the power conversion module being connected to the switch and the lidar respectively via shielded twisted-pair cables.