A high-precision tunnel fan clearance height measurement method

Abstract

The application relates to a high-precision tunnel fan clearance height measuring method, and a measuring device comprises a structure main body, a measuring unit, a display device, a holding device and measuring analysis software. Compared with a traditional road lamp vehicle tape and ground measurement by using a single laser range finder, the application can realize multi-point and high-precision scanning of the height of a curve surface under a fan by using a circular handheld laser array structure and high-precision laser ranging technology, and in a deviation redundant range, the position and distance data can be used to realize rapid and accurate measurement of the fan clearance height, and the application has higher adaptability.

Description

Technical Field

[0001] This invention relates to the field of engineering surveying technology, specifically to a high-precision method for measuring the clearance height of tunnel ventilation fans. Using a circular handheld laser array structure, and addressing the practical needs of tunnel ventilation fan clearance height measurement, high-precision scanning of the fan surface elevation can be achieved at multiple points using high-precision laser ranging technology. Through data analysis and calculation, the clearance height of the tunnel ventilation fan can be measured quickly and accurately. Background Technology

[0002] With the rapid development of highway construction in my country, the mileage of highway tunnels is also steadily increasing. As a special type of structure, tunnels have played a significant role in promoting the development of my country's transportation industry. Due to their unique characteristic of "traversing mountains and valleys," there is a significant difference between the interior and the outside world. Long and extra-long tunnels are equipped with ventilation fans to ensure normal ventilation. In case of emergencies such as low visibility, traffic accidents, or fires, the fans will be activated to remove smoke and improve visibility. Ventilation facilities are an important component of tunnel electromechanical facilities. Their measured items are usually tested during final acceptance, periodic inspections, and special inspections. Among these, the clearance height of tunnel fans is a particularly important critical item. Fans with clearance heights below the lower limit are prone to contact and collision with large passenger and freight vehicles and construction vehicles, posing a significant safety hazard.

[0003] Currently, there are two main methods for measuring the clearance height of tunnel ventilation fans. The first method involves using a mobile lighting vehicle, where inspectors visually select the lowest point on the fan's underside and then measure the distance from that point to the ground using a laser rangefinder or measuring tape. This method requires renting a mobile lighting vehicle and demands a high level of visual judgment from the inspectors, resulting in high accuracy. The second method involves placing a laser rangefinder on the tunnel surface and visually determining the approximate location of the lowest point on the fan's underside. Multiple distance measurements are then taken within this area, and the minimum value is considered the clearance height of the tunnel ventilation fan. This method is relatively simple, but it is difficult to accurately locate the lowest point on the fan's underside on the tunnel surface, leading to lower measurement accuracy. For measuring the clearance height of a single ventilation fan, both traditional methods are time-consuming and yield inaccurate results. Therefore, there is an urgent need to propose a more applicable detection device or method. Summary of the Invention

[0004] To address the current problems in detecting the clearance height of tunnel ventilation fans, this invention proposes a high-precision method for measuring the clearance height of tunnel ventilation fans. By using a circular handheld laser array structure and addressing the actual needs in the process of measuring the clearance height of tunnel ventilation fans, this invention utilizes high-precision laser ranging technology to achieve simultaneous, multi-point, high-precision scanning of the elevation of the lower surface of the fan. Through data analysis and calculation, the height of a single tunnel ventilation fan can be measured quickly and accurately.

[0005] A high-precision method for measuring the clearance height of tunnel ventilation fans. The measuring device includes a measuring system and measuring analysis software. The measuring system consists of independent laser ranging units, including 4 quadrants, with 15 laser ranging units in each quadrant, for a total of 60 laser ranging units. Each time a data acquisition is triggered, the 60 laser ranging units complete a short-term continuous acquisition according to the set acquisition frequency, and transmit the laser ranging unit number and the acquisition value corresponding to that unit to the measuring analysis software.

[0006] First, set the acquisition location and frequency. Place the measuring device directly below the wind turbine on the road surface to trigger the measurement system's 60 laser ranging units in four quadrants to simultaneously begin distance measurement and acquisition. Perform multiple measurements according to the set acquisition frequency and calculate the average to obtain the test distance values ​​for each quadrant, while also providing the lowest value. The measurement analysis software will map the acquired laser ranging unit numbers to the distance information, analyze and model the data, reconstructing the curved surface under the wind turbine. Based on the results, the success of the acquisition can be determined.

[0007] When two of the 60 laser ranging units have similar measurements and are physically far apart, the measurement is considered successful, and the average of the two measurements is the wind turbine clearance height value.

[0008] If there is only one minimum value in the laser ranging unit, and the laser ranging unit farthest from that unit has the largest measurement value, the measurement is considered to have failed. The placement of the measuring device has exceeded the deviation redundancy range. The direction of movement and adjustment is given according to the data value until the measurement is successful, and finally the net height value of the wind turbine is obtained.

[0009] Compared with existing technologies and products, this invention has significant advantages:

[0010] The high-precision tunnel ventilation fan clearance height measurement method proposed in this invention, compared with the traditional street light vehicle tape measure and the measurement using a single laser rangefinder on the ground, proposes a novel circular handheld laser array structure. By utilizing high-precision laser ranging technology, it can achieve multi-point, high-precision scanning of the elevation of the lower curved surface of the fan. Within the deviation redundancy range, the clearance height of the fan can be quickly and accurately measured using position and distance data, which has higher adaptability. Attached Figure Description

[0011] Figure 1 This is an overall structural diagram of the high-precision tunnel ventilation fan clearance height measuring device in this invention.

[0012] Figure 2 This is a schematic diagram of the display device and holding device in this invention.

[0013] Figure 3 This is a side view of a measured example of the measuring device in this invention.

[0014] Figure 4 This is a cross-sectional view of a measured example of the measuring device in this invention.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1-Main structure, 2-Measurement system, 3-Analysis result display window, 4-Acquisition data display window, 5-Holding device, 31-Analysis result display screen, 32-Up button, 33-Down button, 34-Confirm button, 41-Acquisition data display screen, 5-Holding device, 51-Test button, 52-Charging / data export interface, M-Tunnel ventilation fan clearance height measuring device, F-Ventilator under test in the tunnel, L1-1, L1-2, L1-3, L1-4…L1-N, L1-(N+1) are all distance acquisition paths of a single laser ranging unit, (M1, M2)- Figure 4 Middle tunnel ventilation fan clearance height measuring device, (F1, F2)- Figure 4 The fan being tested inside the tunnel. Detailed Implementation

[0017] The following detailed description of a high-precision tunnel ventilation fan clearance height measurement method of the present invention, in conjunction with the accompanying drawings and specific embodiments, provides further details.

[0018] Example:

[0019] Combination Figure 1 As shown, Figure 1 This is an overall structural diagram of the high-precision tunnel ventilation fan clearance height measuring device of the present invention. 1 represents the main structure, 2 represents the measuring system, 3 and 4 represent the display devices, and 5 represents the holding device. The entire device is a circular ring structure with an outer diameter of 440mm, an inner diameter of 320mm, and a holding device length of 120mm.

[0020] As shown Figure 1 1 is the main structure, providing the overall frame structure for the measuring device, connecting with display devices 3 and 4, and providing the assembly basis for the subsystem units.

[0021] As shown Figure 1 The middle 2 is the measurement system. Each measurement unit is an independent laser ranging unit. When a collection signal is received, a short continuous collection will be triggered immediately. Then, the collected distance information is averaged and transmitted to the measurement analysis software. The entire tunnel ventilation fan clearance height measurement device contains 60 measurement units in 4 quadrants.

[0022] As shown Figure 1 3 and 4 are display devices, which consist of two parts: 3 is the analysis result display window (result information), and 4 is the data acquisition display window (measured value).

[0023] As shown Figure 1The middle 5 is a holding device, mainly used for operation and movement during device testing. It has a built-in data acquisition start button, charging interface and battery.

[0024] As shown Figure 1 The analysis software for the measurement device mainly consists of three parts: operating software, data acquisition software, and analysis and processing software. The operating software primarily handles the basic settings of the software operating system. The data acquisition software mainly sets the location and acquisition frequency. The analysis and processing software mainly analyzes and models the acquired distance information, reconstructs the surface condition based on the acquired data and its location, and analyzes and determines whether the acquisition was successful. If the acquisition was successful, the net clearance height value of the wind turbine group can be calculated.

[0025] Combination Figure 2 As shown, Figure 2 This is a schematic diagram of the display device and holding device in this invention. 3 is the analysis result display window, 31 is the analysis result display screen, 32 is the up button, 33 is the down button, 34 is the confirmation button, 4 is the data acquisition display window, 41 is the data acquisition display screen, 5 is the holding device, 51 is the test button, and 52 is the charging / data export interface.

[0026] As shown Figure 2 The middle window (3) is the analysis results display window, mainly used to set and display the physical location of the collected data and the net height results after analysis and calculation.

[0027] As shown Figure 2 The middle section (31) is the analysis results display screen, which can display the maximum, minimum, and average values ​​in a single data collection.

[0028] As shown Figure 2 The button 32 is the move-up button, 33 is the move-down button, and 34 is the confirm button. These are mainly used to set data location information and to search for real-time collected data and historical data records.

[0029] As shown Figure 2 The middle 4 is the data collection and display window, which can display the measured distance value of a single collection.

[0030] As shown Figure 2 The center 41 is a data acquisition display screen, which allows users to view the measured distance values ​​of a single acquisition according to the quadrant and position order, and outputs the minimum value of that quadrant.

[0031] As shown Figure 2 The middle 5 is a holding device, mainly used for operation and movement during device testing. It has a built-in data acquisition start button, charging interface and battery.

[0032] As shown Figure 2The button 51 is the start button for the measuring device. After setting the acquisition frequency and acquisition position, place the acquisition device on the ground and press the start button to trigger a data acquisition.

[0033] As shown Figure 2 The 51 is a charging and data transmission interface. Through this interface, the built-in battery of the measuring device can be charged, and the large amount of collected data can be exported.

[0034] Combination Figure 3 As shown, Figure 3 This is a side view of a measured example of the measuring device in this invention. M is the tunnel ventilation fan clearance height measuring device, F is the ventilation fan being measured inside the tunnel, and L1-1, L1-2, L1-3, L1-4…L1-N, L1-(N+1) are all distance acquisition paths for a single measuring unit. The acquisition unit landing points of each measuring unit are as follows: Figure 3 As shown in the image.

[0035] As shown Figure 3 The device in the middle M is a tunnel ventilation fan clearance height measuring device, which can realize the rapid and accurate measurement of the ventilation fan clearance height;

[0036] As shown Figure 3 The F in the middle section refers to the ventilation fan being tested inside the tunnel. It is arranged in pairs according to the length of the tunnel.

[0037] As shown Figure 3 L1-1, L1-2, L1-3, L1-4...L1-N, L1-(N+1) are all distance acquisition paths for a single measurement unit, as shown in the figure. When a single measurement is triggered, each measurement unit has a acquisition unit landing point. Based on the acquisition distance value and the relative position of each point, the lower curved surface of the wind turbine can be modeled to obtain the minimum value, thereby obtaining the net height value.

[0038] Combination Figure 4 As shown, Figure 4 This is a cross-sectional view of a measured example of the measuring device in this invention. M1 and M2 are the tunnel ventilation fan clearance height measuring devices, F1 and F2 are the ventilation fans being measured inside the tunnel, and L1-1, L1-2, L1-3, L1-4…L1-N and L2-1, L2-2…L2-N, L2-(N+1), L2-(N+2) are all distance acquisition paths for a single measuring unit. The acquisition unit landing points of each measuring unit are as follows: Figure 4 As shown in the figure, the diameter of the fan R1 is 640mm, and the diameter of the measuring device R2 is 440mm.

[0039] As shown Figure 4 F1 and F2 are the ventilation fans being tested inside the tunnel. They are arranged in pairs according to the length of the tunnel.

[0040] As shown Figure 4M1 and M2 are tunnel ventilation fan clearance height measuring devices, which can realize the rapid and accurate measurement of ventilation fan clearance height.

[0041] As shown Figure 4 In the figure, L1-1, L1-2, L1-3, L1-4…L1-N and L2-1, L2-2…L2-N, L2-(N+1), L2-(N+2) are all distance acquisition paths for a single measurement unit. As shown in the figure, when a single measurement is triggered, each measurement unit has a collection unit landing point. Based on the collection distance value and the relative position of each point, the lower curved surface of the wind turbine can be modeled to obtain the net height value.

[0042] As shown Figure 4 The diagram on the left shows the M1 data acquisition unit. In this diagram, the acquisition device M1 is in an ideal position, located directly below the wind turbine. Two quadrant acquisition units will fall to the left of the central axis, and two quadrant acquisition units will fall to the right of the central axis. The distance data collected by the acquisition units are symmetrically distributed. The average of the two minimum values ​​is the accurate net height value.

[0043] As shown Figure 4 The diagram on the right shows the acquisition of M2. In this diagram, the acquisition device M2 is in a critical position. The leftmost acquisition unit of the measuring device is located directly below the fan. All four quadrant acquisition units fall to the right of the central axis. In this state, there will be a minimum value for one acquisition unit, which is the clearance height value.

[0044] As shown Figure 4 In the process, when the tunnel ventilation fan clearance height measuring device M is placed relative to the centerline and within the ideal position ±R2, it is within the deviation redundancy range of the measuring device and can be successfully collected. When it exceeds the deviation redundancy range, the collected data will only have one minimum value. The position can be adjusted along the direction of the minimum value according to the collection distance value and relative position. When it enters the deviation redundancy range, two minimum values ​​will appear. The average value is the accurate clearance height value.

[0045] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-precision tunnel fan clearance height measurement method, characterized in that, The measuring device comprises a measuring system and a measuring analysis software, and has a circular ring structure. The measuring system is composed of independent laser ranging units, and comprises four quadrants, each of which has 15 laser ranging units, and a total of 60 laser ranging units. Once triggered, the 60 laser ranging units complete a short-time continuous collection according to the set collection frequency, and transmit the laser ranging unit number and the corresponding collection value to the measuring analysis software. Firstly, the collection position and the collection frequency are set, the measuring device is placed directly below the fan, and the 60 laser ranging units in the four quadrants of the measuring system are triggered to start ranging and collection simultaneously. According to the set collection frequency, multiple measurements are completed to obtain the test distance values of different quadrants, and the minimum value is given. The measuring analysis software corresponds the collected laser ranging unit number and distance information one by one, analyzes and models, restores the curve surface below the fan, and determines whether the collection is successful according to the result. When two minimum measurement values in the 60 laser ranging units are close and the physical positions are far apart, it is determined that the measurement is successful, and the average value of the two measurement values is the fan clearance height value. When there is only one minimum value in the laser ranging unit, and the measurement value of the laser ranging unit farthest from the unit is the maximum, it is determined that the measurement fails, the placement position of the measuring device has exceeded the deviation redundancy range, the direction of movement adjustment is given according to the data value, until the measurement is successful, and finally the fan clearance height value is obtained.

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