Tunnel section digital sampling device for urban rail passenger car

Abstract

The utility model belongs to the technical field of urban rail transit equipment, and particularly discloses a tunnel section digital sampling device for an urban rail passenger car, which comprises a bottom plate and a shell hermetically connected to the top of the bottom plate, a plurality of camera modules are distributed on the bottom plate, the camera modules are distributed at the edge of the bottom plate, and the camera modules are connected with the shell. And the shell is arranged outside the plurality of camera modules in a sleeving manner. The utility model provides a tunnel section digital sampling device for an urban rail passenger car, which adopts an urban rail main track operation electric passenger car as a carrying object, and can be arranged in the middle of the front part of a head cover of a cab of the car, above a car coupler and below a windscreen wiper. When a vehicle runs on a main line, the device can perform online and real-time digital sampling on the section of the tunnel, and analyzes sampled data to realize all-weather and high-frequency detection on the environment state of the tunnel.

Description

Technical Field

[0001] The utility model belongs to the technical field of urban rail transportation equipment, in particular to a tunnel section digital sampling device for urban rail passenger cars. Background Art

[0002] Urban rail transit routes include numerous underground lines, primarily composed of tunnels and their associated structures, which provide the space, lighting, gas, energy, and network connectivity required for vehicle operation. A healthy tunnel environment is crucial for ensuring the safe operation of urban rail transit, and monitoring the tunnel environment during operation is essential.

[0003] However, existing tunnel environmental status monitoring methods mostly use two methods: manual inspection or inspection by engineering vehicles equipped with equipment. Manual inspection requires a large amount of manpower, and manual inspection often requires the use of professional auxiliary tools to observe the overall condition of the tunnel section. The inspection results must be judged based on the operator's experience, making the inspection efficiency relatively low. Engineering vehicles are equipped with specialized tools, reducing reliance on manpower. However, due to the operation of urban rail, they can only operate during the operating window, and the attendance frequency is often low. The sampling intervals for tunnel environmental status monitoring with these two inspection methods are generally long, and the sampling results are also the status of the object when it is not in operation. The data provided for tunnel environmental status monitoring is insufficient in terms of timeliness and comprehensiveness. Utility Model Content

[0004] The present utility model aims to overcome the aforementioned problems of the prior art by providing a digital tunnel cross-section sampling device for urban rail passenger vehicles. The device, which is mounted on urban rail mainline electric passenger vehicles, is located midway between the front of the vehicle's driver's cab hood, above the coupler, and below the wipers. While the vehicle is operating on the mainline, the device performs online, real-time digital sampling of tunnel cross-sections. Analysis of the sampled data enables all-weather, high-frequency monitoring of tunnel environmental conditions.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A tunnel cross-section digital sampling device for urban rail passenger cars comprises a base plate and a housing sealed to the top of the base plate. The base plate is provided with a plurality of camera modules distributed at the edge of the base plate. The housing is sleeved over the plurality of camera modules.

[0007] The camera module includes a module housing, an area array camera, a line laser and a line array camera. The area array camera, line laser and line array camera are all arranged on the outside of the module housing. A plurality of viewing windows are opened on the housing, and the viewing windows are used to provide a shooting field of view for the area array camera, line laser and line array camera.

[0008] Furthermore, an anti-slip rope is provided in the shell, one end of the anti-slip rope is fixedly installed in the shell, the other end of the anti-slip rope is fixedly installed with an end head, and the other end of the end head is fixedly connected to a mounting bracket.

[0009] Furthermore, a fixing hole is provided on the top edge of the base plate, a notch is provided on the outer surface of the shell, a bolt fixing groove is provided at the bottom of the notch, a locking bolt is provided in the bolt fixing groove, one end of the locking bolt passes through the bolt fixing groove and is located in the fixing hole, and one end of the locking bolt passes through the fixing hole and is threadedly connected to a locking nut.

[0010] Furthermore, a wiring hole is provided in the center of the bottom surface of the bottom plate, and a heat shrink tubing fixing member is provided in the wiring hole;

[0011] The bottom surface of the base plate is further provided with a connecting flange, and the inner hole of the connecting flange is concentric with the wiring hole;

[0012] An inner sealing groove and an outer sealing groove are formed with the inner hole of the connecting flange as the center of the circle. The inner sealing groove and the outer sealing groove are both concentric with the wiring hole. The outer diameter of the inner sealing groove is smaller than the inner diameter of the outer sealing groove.

[0013] O-type sealing rings are arranged in the inner sealing groove and the outer sealing groove.

[0014] Furthermore, the bottom surface of the bottom plate and the outer surface of the shell are provided with multiple heat dissipation modules, and the heat dissipation modules include multiple weight-reducing windows arranged in parallel;

[0015] The shell is provided with a plurality of reinforcing ribs;

[0016] The edge of the top surface of the bottom plate is also integrally formed with a lug, which is snap-fitted into the shell.

[0017] Furthermore, there are three camera modules distributed in an isosceles triangle.

[0018] Furthermore, two fixing brackets are provided on the outside of the camera module, a camera fixing position is provided below the fixing brackets, and the fixing brackets are fixed to the camera fixing position by bolt connection;

[0019] The camera fixing position is integrally formed and arranged on the top of the bottom plate;

[0020] The camera module is fixed between two fixing brackets by means of bolt connection.

[0021] Furthermore, the area array camera, line laser and line array camera are arranged on the same side of the module housing;

[0022] The center point of the area array camera, the center point of the line array camera and the center point of the line laser form a right triangle;

[0023] The center point of the area array camera and the center point of the line array camera are located on one right-angled side of the right triangle, and the center point of the line array camera and the center point of the line laser are located on the other right-angled side of the right triangle.

[0024] Furthermore, a plurality of reinforcement members are evenly distributed on the outside of the module housing;

[0025] The module housing is also provided with an electric control component, a heat dissipation structure and an electrical interface of the equipment;

[0026] The electronic control component is used to control the area array camera, line laser and line array camera;

[0027] The heat dissipation structure is used for heat dissipation of area array cameras, line lasers, line array cameras and electronic control components.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This utility model provides a digital tunnel cross-section sampling device for urban rail passenger vehicles. This device is installed in a location midway between the front of the vehicle's driver's cab hood, above the coupler, and below the wiper. While the vehicle is operating on the mainline, the device performs online, real-time digital sampling of tunnel cross-sections. Analysis of the sampled data enables all-weather, high-frequency monitoring of tunnel environmental conditions.

[0030] 2. The present invention adopts a lightweight, miniaturized, and symmetrical design. The vehicle body structure is fully considered when arranging the device structure, and the length dimension reserves a working buffer space for the coupler coupling. The device is designed to be installed close to the geometric center of the tunnel, so that each group of cameras in the device can capture the largest possible area of the tunnel within the same viewing angle; at the same time, the number of cameras is also reduced, so that the device can be lightweight and miniaturized. After the camera is symmetrically installed in the center, the captured image is also symmetrical, which reduces the difficulty of image splicing and data processing in the software work, takes into account the requirements of efficient output of the final state from the perspective of raw data acquisition, and optimizes the structural design.

[0031] 3. The utility model adopts a hierarchical detachable design. The tunnel section digital sampling device and the vehicle body are connected by a deformed flange, and two groups of bolt holes are evenly distributed on the flange surface. The connection between the device and the vehicle body is provided with a sealing structure. In order to ensure the sealing effect, an O-ring is designed on both the inner and outer sides of the bolt hole distribution circle. Bolts are used to connect the device base plate and the camera module, and between the base plate and the outer shell. The wiring harness in the device passes through the middle wire hole position and enters the vehicle. A sealing groove is provided at the wire harness passing position, and a heat shrink tubing with glue is used to complete the sealing of the wire passing position.

[0032] 4. Industrial design optimization of the external structure of the device in this utility model. The external structure design of the device not only meets the requirements of mechanical installation, but also fully considers integration into the vehicle appearance, and adopts a full-curved structure design. The bottom plate uses the space at the non-contact sealing position to set up oblong structure windows to reduce the weight of the device. The side of the shell has a viewing window with a spatial oblong structure, which reduces the weight, improves the heat dissipation efficiency of the device, and adds curved surface elements to the device. A square structure is added to the front end of the shell to strengthen the strength of the load-bearing surface of the device. The bolt fixing structure of the shell adopts a hidden design, which is convenient for the disassembly operation of the equipment and does not affect the overall shape.

[0033] 5. The device of this invention is equipped with three camera modules. Each camera module utilizes a combination of a linear array camera, an area array camera, and a line laser—that is, a combination of a 2D camera, a 3D camera, and a line laser. The viewing angles of these three camera modules completely cover the cross-section except for the vehicle contact surface. Both the 2D and 3D cameras are triggered by signals from the vehicle's axle-end speed sensor, ensuring synchronization of camera operations. Both cameras capture the tunnel surface illuminated by the line laser. The line laser utilizes frequency-adjustable non-visible light, ensuring both image clarity and operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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:

[0035] Figure 1 This is an exploded view of the structure of the digital sampling device for tunnel sections used in urban rail passenger cars provided by the utility model;

[0036] Figure 2 This is an exploded view of the structure of the digital sampling device for tunnel sections used in urban rail passenger cars provided by the utility model;

[0037] Figure 3The utility model is a flowchart of the working method of the tunnel section digital sampling device provided by the present invention.

[0038] Among them, the figure markings are: 1. Base plate; 101. Fixing hole; 102. Connecting flange; 103. Heat shrink tubing fixing piece; 104. Lug; 105. Camera fixing position; 106. Weight reduction window; 107. Inner sealing groove; 108. Outer sealing groove; 2. Shell; 201. Bolt fixing groove; 202. Viewing angle window; 3. Camera module; 301. Area array camera; 302. Line laser; 303. Line array camera; 304. Electronic control component; 305. Reinforcement; 306. Heat dissipation structure; 307. Equipment electrical interface; 4. Fixing bracket; 5. O-ring; 6. Anti-slip rope; 601. End; 602. Mounting bracket. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Example 1

[0042] like Figures 1 to 2 As shown, a tunnel cross-section digital sampling device for urban rail passenger cars includes:

[0043] A base plate 1 and a housing 2 sealed to the top of the base plate 1 . Three camera modules 3 are arranged on the base plate 1 . The three camera modules 3 are distributed at the edge of the base plate 1 and form an isosceles triangle.

[0044] The device housing 2 is designed as a thin-walled part, which has the characteristics of integration and lightness;

[0045] An anti-slip rope 6 is provided in the housing 2, one end of the anti-slip rope 6 is fixedly installed in the housing 2, and the other end of the anti-slip rope 6 is fixedly installed with an end head 601, and the other end of the end head 601 is fixedly connected to a mounting bracket 602;

[0046] The device is equipped with an anti-slip rope 6, one end of which is fixed inside the device and the other end is fixed to the vehicle body structure. The two ends of the anti-slip rope 6 are fixed by crimping, which reduces the space required for the end 601. At the same time, it has a mounting bracket 602 for connecting to the vehicle body, which facilitates the layout of the device.

[0047] Two fixing brackets 4 are provided on the outside of the camera module 3. A camera fixing position 105 is provided below the fixing brackets 4. The fixing brackets 4 are fixed to the camera fixing position 105 by bolt connection.

[0048] The camera fixing position 105 is integrally formed and arranged on the top of the bottom plate 1;

[0049] The camera module 3 is fixed between the two fixing brackets 4 by means of bolt connection;

[0050] Each group of camera modules 3 is fixed to the base plate 1 by two fixing brackets 4. The positioning accuracy of the camera is high, providing a basic structure for data collection. Since the three camera modules 3 are distributed in an isosceles triangle on the base plate 1, the left and right symmetrically arranged camera modules 3 on the base plate 1 are installed on the same horizontal plane, keeping the line lasers on the same horizontal plane, and the appearance is symmetrical; within the viewing angle of the top camera module 3, the laser lines of the left and right camera modules will appear. In order to ensure the independence of the light source, the installation surface of the top camera module 3 is different from the other two groups of camera modules 3; at the same time, the layout of the three groups of camera modules 3 takes into account the operating space, so that the design of the equipment is minimized and lightweight. This part is connected and fixed to the vehicle body through the fixing hole 101 in the middle of the base plate 1. The connection process has an anti-slip structure, namely an anti-slip rope 6 and a sealing structure, namely an O-ring 5, which assists the digital sampling device in meeting the anti-slip and sealing requirements. Finally, the housing 2 of the digital sampling device is installed on the base plate 1 to complete the assembly of the entire equipment. The disassembly process is the reverse of the assembly, and both disassembly and assembly are relatively convenient;

[0051] A fixing hole 101 is provided on the top edge of the base plate 1, and a notch is provided on the outer surface of the housing 2. A bolt fixing groove 201 is provided at the bottom of the notch. A locking bolt is provided in the bolt fixing groove 201. One end of the locking bolt passes through the bolt fixing groove 201 and is located in the fixing hole 101. The other end of the locking bolt passes through the fixing hole 101 and is threadedly connected to a locking nut. Since the bolt fixing groove 201 is provided at the bottom of the notch, the locking bolt adopts such a hidden design, which facilitates the overall disassembly operation of the device while not affecting the overall shape.

[0052] That is, the base plate 1 and the housing 2 are connected and fixed by locking bolts and locked by locking nuts;

[0053] A wiring hole is provided in the center of the bottom surface of the base plate 1, and a heat shrink tubing fixing member 103 is provided in the wiring hole;

[0054] There is a channel for wires and ropes in the middle, and a heat shrink sleeve fixing part 103 is provided for fixing the heat shrink sleeve. Three layers of grooves are provided to allow the colloid to flow out of the groove during the heat shrinking process. The sleeve has a concave and convex structure in this process, which achieves waterproof and reliable performance.

[0055] A connecting flange 102 is also provided on the bottom surface of the base plate 1, and the inner hole of the connecting flange 102 is concentric with the wiring hole;

[0056] On the deformed 145 connecting flange 102, 8 holes with a diameter of 11 mm are unevenly and symmetrically arranged to connect with the vehicle body, with high connection strength;

[0057] An inner sealing groove 107 and an outer sealing groove 108 are formed with the inner hole center of the connecting flange 102 as the center. The inner sealing groove 107 and the outer sealing groove 108 are both concentric with the wiring hole. The outer diameter of the inner sealing groove 107 is smaller than the inner diameter of the outer sealing groove 108.

[0058] O-rings 5 are provided in both the inner sealing groove 107 and the outer sealing groove 108;

[0059] An O-ring 5 is installed in the sealing groove; after the equipment base is assembled with the vehicle, the protection level requirement of IP67 can be achieved.

[0060] The bottom surface of the base plate 1 and the outer surface of the shell 2 are also provided with multiple sets of heat dissipation modules, which include multiple weight-reducing windows 106 arranged in parallel. The shell 2 is also provided with multiple reinforcing ribs, specifically, the side walls, transitions, and front ends of the shell 2 are all provided with reinforcing ribs. The reinforcing ribs are used to strengthen the strength of the device's load-bearing surface.

[0061] A plurality of weight-reducing windows 106 are provided to reduce the overall mass of the digital sampling device while achieving a heat dissipation function, which is beneficial to the normal operation of internal components;

[0062] The top edge of the bottom plate 1 is also integrally formed with a lug 104, which is snap-fitted into the housing 2;

[0063] There are lugs 104 on the left and right sides of the base plate to ensure that the housing can rest on the base plate after the fastening bolts are released. Human intervention is required to separate the housing and the base plate to prevent the equipment from falling suddenly during the disassembly process.

[0064] The camera module 3 includes a module housing, an area array camera 301, a line laser 302, and a line array camera 303. The area array camera 301, the line laser 302, and the line array camera 303 are all disposed outside the module housing. A plurality of viewing windows 202 are provided on the housing 2 to provide a field of view for the area array camera 301, the line laser 302, and the line array camera 303. The viewing windows 202 are arc-shaped, spatially forming an oblong shape, to avoid interference with the images captured by the area array camera 301, the line laser 302, and the line array camera 303.

[0065] The area array camera 301, the line laser 302 and the line array camera 303 are arranged on the same side of the module housing;

[0066] The center point of the area array camera 301, the center point of the line array camera 303, and the center point of the line laser 302 form a right triangle;

[0067] The center point of the area array camera 301 and the center point of the line array camera 303 are located on one right-angled side of the right triangle, and the center point of the line array camera 303 and the center point of the line laser 302 are located on the other right-angled side of the right triangle;

[0068] Since each camera module has an area array camera 301, a line laser 302, and a line array camera 303, the three camera modules can capture a sector angle greater than 270°, enabling effective sampling of the tunnel surface.

[0069] The combination of the area array camera 301 and the line laser 302 can calculate the distance of the sampling object through the principle of triangulation; the combination of the line laser 302 and the line array camera 303 can obtain a high-definition image of the sampling object;

[0070] A plurality of reinforcement members 305 are evenly distributed on the outside of the module housing;

[0071] The module housing is also provided with an electric control component 304, a heat dissipation structure 306 and an equipment electrical interface 307;

[0072] Three camera modules 3 are arranged in an isosceles triangle configuration, i.e., a symmetrical design. Each camera module 3 comprises a line array camera 303, an area array camera 301, and a line laser 302. This combination of a 2D camera, a 3D camera, and a line laser allows the three camera modules 3 to fully cover all sections except the vehicle contact surface. Both the 2D and 3D cameras are triggered by signals from the vehicle's axle-end speed sensors, ensuring synchronization of camera operations. Both the 2D and 3D cameras capture the tunnel surface illuminated by the line laser, which uses frequency-adjustable non-visible light to ensure both image clarity and operational safety.

[0073] In actual use, the device can be installed in the middle position between the front of the driver's cab hood, above the coupler and below the wiper. Since the vehicle structure has been fully taken into consideration when arranging the device, this installation position allows each camera in the camera module 3 to capture the largest possible area of the tunnel within the same viewing angle range. At the same time, due to this setting, the number of cameras can be reduced to a certain extent, making the device lightweight and miniaturized.

[0074] This embodiment provides a tunnel cross-section digital sampling device for urban rail passenger vehicles. This device is installed in a location midway between the front of the vehicle's driver's cab hood, above the coupler, and below the wiper. While the vehicle is operating on the mainline, the device performs online, real-time digital sampling of tunnel cross-sections. Analysis of the sampled data enables all-weather, high-frequency monitoring of tunnel environmental conditions.

[0075] Example 2

[0076] like Figure 3 As shown, this embodiment provides a working method of a tunnel cross-section digital sampling device for urban rail passenger cars, the method comprising the following steps:

[0077] S1: Sampling device installation

[0078] The tunnel cross-section digital sampling device for urban rail vehicles is installed in the middle of the front of the driver's cab hood, above the coupler, and below the wiper. Data from the area array camera 301 and line array camera 303 is transmitted using a Gigabit Ethernet communication protocol based on the UDP protocol. This defines the camera control and configuration, as well as the data type transmitted, ensuring the integrity and reliability of data transmission. The line laser 302 is controlled using the RS485 communication protocol, and the data signal is transmitted using a differential transmission method, which can meet the control frequency requirements and has strong anti-interference capabilities.

[0079] S2: Image capture

[0080] During vehicle operation, the square wave signal generated by the axle end speed sensor is transmitted to the line array camera 303, triggering the line array camera 303 to take pictures. The captured position is the image where the line laser 302 intersects the tunnel surface. The line array camera 303 obtains a line of image each time it takes a picture.

[0081] During vehicle operation, the speed sensor at the axle end plays a key role, responsible for real-time monitoring and measuring the vehicle's speed. Specifically, when the vehicle is moving, the speed sensor at the axle end generates a square wave signal. This square wave signal has the characteristics of constant amplitude, adjustable duty cycle, adjustable phase, and good stability, making it very suitable for speed measurement and transmission. The generated square wave signal is then transmitted to the line array camera 303, triggering the line array camera 303 to capture images. The line array camera is a camera that uses a line array sensor for image acquisition. Its working principle is to scan the object being photographed with the line array sensor and then convert the scanned signal into a digital image. The line array camera 303 captures the image of the intersection of the line laser 302 and the tunnel surface, and the line array camera 303 obtains a line of image with each capture.

[0082] S3: Multiple lines of images are stitched together to form an image data file

[0083] The linear array camera 303 sets the shooting working frequency in combination with the signal frequency of the speed sensor, and splices the multiple lines of images captured to form a continuous, visible image data file of the tunnel surface;

[0084] Specifically, during the shooting process, the line array camera 303 continuously captures multiple lines of images at an operating frequency that matches the vehicle speed. Because these images are captured based on the signal frequency of the speed sensor, the intervals between them are uniform and precise, facilitating subsequent image stitching processing. Simultaneously, the data collected by the three groups of line array cameras 303 are stitched together. The stitched images have an overall viewing angle that covers the upper surface area of the tunnel, forming a continuous, visible image data file of the tunnel surface.

[0085] S4: Image data preprocessing and neural network processing

[0086] The image data file is transferred to the AI board, and then goes through basic image pre-processing such as denoising and filtering by the image algorithm program, and then image cropping and normalization are performed to obtain the recognition image data;

[0087] Identify image data and then use deep neural networks to perform matrix calculations, extract and match features to obtain output, and then use NMS non-maximum suppression and thresholding to filter out false matches and analyze preliminary abnormal conditions;

[0088] The specific process of obtaining recognition image data is as follows: During vehicle operation, due to various environmental factors and limitations of the equipment itself, the image data file may contain noise, which will interfere with the quality and clarity of the image data file. Denoising algorithms can effectively reduce or eliminate these noises and improve the clarity of the image data file. After the denoising process is completed, filtering is performed to help eliminate high-frequency noise and details in the image while retaining the main features of the image. Cropping is then performed to select the target area from the original image according to specific needs or goals, and redundant information is removed. Finally, after normalization, the pixel values of the image data file are mapped to a specific range, usually scaling the pixel values to between 0 and 1, thereby obtaining recognition image data.

[0089] The specific process of analyzing the initial abnormal state is as follows:

[0090] S41: Based on the feature learning and expression capabilities of deep neural networks, complex feature information is extracted from the recognition image data. Through multi-layer convolution, pooling, and full connection operations, the neural network can learn the key features in the recognition image data. In the feature extraction stage, the deep neural network generates a feature matrix that contains representations of key features in the image. These key features may indicate cracks, deformations, or other abnormalities on the tunnel surface. By comparing the feature matrices of different recognition image data, similarities and differences between them can be determined.

[0091] S42: Use techniques such as NMS (non-maximum suppression) and threshold filtering to eliminate false matches. NMS suppresses matches with low response in a local area and retains only the matches with the highest response, thereby reducing duplicate and redundant matches. Threshold filtering filters out matches with low response based on a set threshold and retains only matches with high response.

[0092] S43: After eliminating false matches in step S42, the matching results are analyzed to obtain preliminary abnormal status outputs. These outputs may include information such as abnormal location, type, and severity, providing a basis for subsequent abnormality processing and decision-making;

[0093] S5: Filtering image algorithm false positives

[0094] The area array camera 301 and the line laser 302 use the principle of triangulation to convert the distance from the tunnel surface to the tunnel center to obtain distance parameters. The initial abnormal state is combined with the distance parameters to filter out false alarm data of the image algorithm.

[0095] Among them, image algorithm false alarm data includes image shooting false alarm data and processing abnormality false alarm data;

[0096] Line laser 302 emits a laser beam, which irradiates the tunnel surface, forming a laser line. Area array camera 301 is responsible for capturing the projection of this laser line on the tunnel surface. Since the positions of area array camera 301 and line laser 302 are known, the distance from the tunnel surface to the tunnel center can be calculated using the principle of triangulation by measuring the position of the laser line in the image captured by area array camera 301.

[0097] Among them, the principle of triangulation is based on the geometric relationship of triangle similarity;

[0098] After obtaining these distance parameters, they can be combined with preliminary abnormal status data for more in-depth analysis. Since image algorithms may be affected by factors such as lighting, shadows, and noise when processing images, resulting in false positives, combining distance parameters can effectively filter out these false positives.

[0099] S6: Output abnormal image

[0100] Output the identified abnormal image of the tunnel surface, and add watermarks of vehicle speed information, station information, and vehicle location information to the image to generate an abnormal image of the fault point information;

[0101] The abnormal image output can be directly displayed on the display screen, or the image can be saved to a local or remote server for subsequent viewing and analysis.

[0102] This embodiment provides a working method of a digital sampling device for tunnel sections for urban rail passenger vehicles, which provides a reference for the use of the digital sampling device for tunnel sections for urban rail passenger vehicles.

[0103] This utility model provides a tunnel cross-section digital sampling device for urban rail passenger vehicles. Using electric passenger vehicles operating on the urban rail mainline as the target, the device is installed midway between the front of the vehicle's driver's cab hood, above the coupler, and below the wiper. While the vehicle is operating on the mainline, the device can perform online, real-time digital sampling of tunnel cross-sections. Analysis of the sampled data enables all-weather, high-frequency monitoring of tunnel environmental conditions.

[0104] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0105] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A tunnel cross-section digital sampling device for urban rail passenger cars, characterized by: The invention comprises a base plate (1) and a shell (2) sealedly connected to the top of the base plate (1); a plurality of camera modules (3) are arranged on the base plate (1); the plurality of camera modules (3) are distributed at the edge of the base plate (1); and the shell (2) is sleeved on the outside of the plurality of camera modules (3); The camera module (3) comprises a module housing, an area array camera (301), a line laser (302), and a line array camera (303); the area array camera (301), the line laser (302), and the line array camera (303) are all arranged outside the module housing; a plurality of viewing angle windows (202) are provided on the housing (2); the viewing angle windows (202) are used to provide a shooting field of view for the area array camera (301), the line laser (302), and the line array camera (303).

2. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: An anti-slip rope (6) is provided in the housing (2), one end of the anti-slip rope (6) is fixedly mounted in the housing (2), the other end of the anti-slip rope (6) is fixedly mounted with an end head (601), and the other end of the end head (601) is fixedly connected to a mounting bracket (602).

3. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: A fixing hole (101) is provided on the top edge of the bottom plate (1), a notch is provided on the outer surface of the shell (2), a bolt fixing groove (201) is provided at the bottom of the notch, a locking bolt is provided in the bolt fixing groove (201), one end of the locking bolt passes through the bolt fixing groove (201) and is located in the fixing hole (101), and one end of the locking bolt passes through the fixing hole (101) and is threadedly connected to a locking nut.

4. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: A wiring hole is provided in the center of the lower bottom surface of the base plate (1), and a heat shrink tubing fixing member (103) is provided in the wiring hole; The bottom surface of the base plate (1) is further provided with a connecting flange (102), and the inner hole of the connecting flange (102) is cocentric with the wiring hole; An inner sealing groove (107) and an outer sealing groove (108) are provided with the inner hole center of the connecting flange (102) as the center, the inner sealing groove (107) and the outer sealing groove (108) are both concentric with the wiring hole, and the outer diameter of the inner sealing groove (107) is smaller than the inner diameter of the outer sealing groove (108); O-type sealing rings (5) are provided in both the inner sealing groove (107) and the outer sealing groove (108).

5. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: The bottom surface of the base plate (1) and the outer surface of the shell (2) are also provided with multiple groups of heat dissipation modules, and the heat dissipation modules include multiple weight-reducing windows (106) arranged in parallel; The shell (2) is provided with a plurality of reinforcing ribs; The top edge of the bottom plate (1) is also integrally formed with a lug (104), and the lug (104) is snap-fitted into the housing (2).

6. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: The number of the camera modules (3) is three and they are distributed in an isosceles triangle.

7. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: Two fixing brackets (4) are provided outside the camera module (3), a camera fixing position (105) is provided below the fixing brackets (4), and the fixing brackets (4) are fixed to the camera fixing position (105) by means of bolt connection; The camera fixing position (105) is integrally formed and arranged on the top of the bottom plate (1); The camera module (3) is fixed between two fixing brackets (4) by means of bolt connection.

8. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: The area array camera (301), the line laser (302), and the line array camera (303) are arranged on the same side of the module housing; The center point of the area array camera (301), the center point of the line array camera (303), and the center point of the line laser (302) form a right triangle; The center point of the area array camera (301) and the center point of the line array camera (303) are located on one of the right-angled sides of the right triangle, and the center point of the line array camera (303) and the center point of the line laser (302) are located on the other right-angled side of the right triangle.

9. The tunnel cross-section digital sampling device for urban rail passenger cars according to claim 1, characterized in that: A plurality of reinforcement members (305) are evenly distributed on the outside of the module housing; The module housing is also provided with an electric control component (304), a heat dissipation structure (306) and an equipment electrical interface (307); The electronic control component (304) is used to control the area array camera (301), the line laser (302) and the line array camera (303); The heat dissipation structure (306) is used for dissipating heat from the area array camera (301), the line laser (302), the line array camera (303), and the electronic control component (304).

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