Scissor type portable wind speed and wind pressure detection device for wind guide device and use method

Abstract

The invention discloses a scissor type portable wind speed and wind pressure detection device for a wind guide device and a use method, the device comprises two wind pipe telescopic supporting levers connected through screws, and multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are fixedly mounted in the two wind pipe telescopic supporting levers; a plurality of groups of wind speed detection modules and a plurality of groups of wind pressure detection modules in the air pipe telescopic supporting lever are connected through cables and are connected with a monitoring signal storage and transmission module; and the monitoring signal storage, processing and transmission module is in communication connection with a terminal outside the tested ventilating duct. According to the scheme, the air leakage severity degree and the air pipe bending degree of each section of the air pipe along the way in the tunnel hole can be monitored in real time and mastered in time, the measurement error caused by manual testing and instrument equipment is reduced, and the data accuracy is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel engineering ventilation, and particularly to a scissor-type portable air guiding device wind speed and wind pressure detection device and a using method thereof. Background Art

[0002] The tunnel construction ventilation system plays a crucial role in the tunnel construction process. It can quickly discharge the dust generated during the face blasting and the harmful gases released during the operation of construction machinery, continuously supply fresh air to the working area, not only effectively guarantee the personal safety of construction workers, greatly improve the construction efficiency, but also effectively adjust the temperature and humidity environment in the tunnel, creating more suitable conditions for construction. However, the installation of tunnel ventilation equipment in complex environments may be imperfect due to space limitations, harsh environments, etc. In some special operation scenarios, such as areas with blasting operations, the ventilation equipment may be impacted by the sputtering of blasting slag, causing pipeline damage. When the air duct needs to move in a narrow space or complex pipeline, it may be bent, squeezed or even damaged, thus affecting the ventilation efficiency. Therefore, being able to accurately and conveniently detect the two key indicators of wind speed and wind pressure of the ventilation device, and then obtain the average air leakage rate per 100 meters and the average wind resistance per 100 meters of the air duct, is the key to evaluating the advantages and disadvantages of ventilation systems in various complex environments, and ensuring the normal operation of the ventilation system and the efficient operation of related equipment.

[0003] In actual on-site environments such as tunnel construction, there are many drawbacks in the existing detection methods for the key performance parameters of air ducts. Usually, the method of mechanical lifting combined with manually holding a wind speed and wind pressure tester is used to measure the wind speed and wind pressure of a single measurement point at the air outlet of the air duct at the face. Then, the single measurement point data is regarded as the average wind speed and wind pressure of the air duct, and the average air leakage rate per 100 meters and the average wind resistance per 100 meters are calculated based on this. This method not only cannot monitor the key performance parameters of the air duct in real time, but also due to relying only on single measurement point data, there is a large difference from the actual overall situation, resulting in a large deviation in the calculated average air leakage rate per 100 meters and average wind resistance per 100 meters data, making it difficult to accurately reflect the true performance of the air duct, thus bringing many uncertainties to the design, construction and subsequent maintenance work of the ventilation system. Summary of the Invention

[0004] Aiming at the above technical problems, the present invention provides a scissor-type portable air guiding device wind speed and wind pressure detection device and a using method thereof. The device is telescopic and easy to carry, can quickly and intelligently measure the wind speed and wind pressure of ventilation devices with different diameters, effectively monitor the ventilation quality, and ensure the ventilation requirements of construction personnel and equipment.

[0005] The present invention is realized by the following technical solutions: A scissor-type portable air guide device wind speed and wind pressure detection device, including two telescopic support rods for air ducts connected by screws. A plurality of wind speed detection modules and a plurality of wind pressure detection modules are fixedly installed in the two telescopic support rods for air ducts. The plurality of wind speed detection modules and the plurality of wind pressure detection modules in the telescopic support rods for air ducts are connected by cable wires and are also connected to a monitoring signal storage and transmission module. The monitoring signal storage, processing, and transmission module is communicatively connected to a terminal outside the measured ventilation duct.

[0006] Specifically, the connection method between the monitoring signal storage, processing, and transmission module and the terminal includes wired connection and wireless connection. The wired connection method includes cable wire connection. The wireless connection method includes short-range wireless transmission such as Bluetooth transmission or WiFi transmission and remote wireless transmission of 4G or 5G networks.

[0007] Specifically, each of the telescopic support rods for air ducts is a hollow cylindrical structural member, composed of multiple telescopic rods for adjusting the length. The multiple telescopic rods are connected by a locking device.

[0008] Specifically, the locking device includes a nested metal tube, a button, and a card slot.

[0009] Specifically, the wind speed detection module is internally equipped with a high-precision hot wire anemometer to measure the wind speed at the air outlet of the ventilation device. It is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing, and transmission module.

[0010] Specifically, the wind pressure detection module is provided with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference inside and outside the ventilation device. It also has a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing, and transmission module.

[0011] Specifically, the monitoring signal storage, processing, and transmission module includes a central processing unit and a power supply module. The central processing unit uses a high-performance microcontroller to receive the digital signals transmitted from the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data, calculate the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis. The power supply module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface.

[0012] A method for using a scissor-type portable air guide device wind speed and wind pressure detection device includes the following steps: Step S1: Extend the telescopic strut of the air duct to the diameter length of the measured ventilation device, making the extended lengths of the telescopic rods consistent and keeping the wind speed detection module and the wind pressure detection module exposed; Step S2: Adjust the angles of the two telescopic struts of the air duct to the vertical state by screws; Step S3: Fix the two ends of the telescopic struts of the air duct to the inner cross-section of the measured ventilation device with buckles or adhesives, making the wind speed and wind pressure detection device of the scissor-type portable air guiding device perpendicular to the cylindrical surface of the measured ventilation device; Step S4: Start the power supply and view the wind speed and wind pressure of the cross-section of the measured ventilation device through the terminal; Step S5: If long-term monitoring is required, keep the device in Step 4 running; if it is temporary monitoring and the device needs to be recovered, then go to Step 6 to recover the wind speed and wind pressure detection device of the scissor-type portable air guiding device and reinstall it when using it again; Step S6: Turn off the power supply, loosen the buckles or adhesive fixation between the two ends of the telescopic struts of the air duct and the measured ventilation device, and remove the wind speed and wind pressure detection device of the scissor-type portable air guiding device; Step S7: Adjust the angles of the two telescopic struts of the air duct to the parallel state by screws; Step S8: Shorten the two telescopic struts of the air duct to the shortest length, and the detection is over.

[0013] Specifically, the calculation formulas for the wind speed and wind pressure of the cross-section of the measured ventilation device are: ; Among them, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average wind pressure of the monitoring section, with the unit of Pa; is the wind speed measured by each sensor in the monitoring section, with the unit of m / s; is the wind pressure measured by each sensor in the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , and .

[0014] Specifically, it also includes the calculation of the air leakage rate per 100 meters of the air duct, and the calculation formula is: ; Among them, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, which is a percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the next monitoring section, with the unit of m 3 / s; is the length of the air duct between two monitoring sections, with the unit of m.

[0015] The beneficial effects of the present invention are as follows: By providing a scissor-type portable air duct air velocity and air pressure detection device and its usage method, the present invention integrates multiple groups of air velocity and air pressure sensors, is retractable, and is easy to carry. It can quickly and intelligently measure the air velocity and air pressure of ventilation devices with different diameters, effectively monitor the ventilation quality, and ensure the ventilation requirements of construction workers and equipment. Compared with the traditional manual hand-held instrument equipment test, it greatly saves manpower and material resources. The test system is more advanced, with automation and intelligence characteristics. At the same time, it also greatly reduces the measurement errors brought by manual testing and instrument equipment, effectively ensuring the accuracy of data. The test system of the present invention can monitor in real time and timely grasp the severity of air leakage and the degree of air duct bending along each section of the tunnel, effectively monitor the air leakage and damage of the air duct and the "intestinal obstruction" phenomenon, and take corresponding measures for remedy in a timely manner, fully ensuring the safety of construction workers and meeting the normal air supply requirements. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 is a schematic structural diagram of the scissor-type portable air duct air velocity and air pressure detection device in the expanded state in the embodiment of the present invention; Figure 2 is a schematic structural diagram of the scissor-type portable air duct air velocity and air pressure detection device in the contracted state in the embodiment of the present invention; Figure 3 is a schematic top view of the scissor-type portable air duct air velocity and air pressure detection device in the expanded state in the embodiment of the present invention; Among them, 1 - air duct telescopic strut, 2 - air velocity detection module, 3 - air pressure detection module, 4 - monitoring signal storage, processing and transmission module, 5 - cable, 6 - screw. Detailed Embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] The following will, in conjunction with the appended Figures 1 to 3 drawings, elaborate on some embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0021] The present invention provides a scissor - type portable air duct wind speed and wind pressure detection device, which includes two telescopic air duct struts connected by screws. A plurality of wind speed detection modules and a plurality of wind pressure detection modules are fixedly installed in the two telescopic air duct struts. The plurality of wind speed detection modules and the plurality of wind pressure detection modules in the air duct telescopic struts are connected by cable wires and are also connected to a monitoring signal storage and transmission module; the monitoring signal storage, processing and transmission module is communicatively connected to a terminal outside the measured ventilation duct. The connection between the monitoring signal storage, processing and transmission module and the terminal includes wired connection and wireless connection. The wired connection method includes cable wire connection, and the wireless connection method includes short - range wireless transmission such as Bluetooth transmission or WiFi transmission and remote wireless transmission of 4G or 5G network. Each of the air duct telescopic struts is a hollow cylindrical structural member, which is composed of multiple telescopic rods for adjusting the length. The multiple telescopic rods are connected by a locking device, and the locking device includes a nested metal tube, a button and a card slot.

[0022] The wind speed detection module is internally provided with a high - precision hot - wire anemometer sensor to measure the wind speed at the air outlet of the ventilation device; it is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module. The wind pressure detection module is provided with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference inside and outside the ventilation device; it is also provided with a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing and transmission module. The monitoring signal storage, processing and transmission module includes a central processing unit and a power supply module. The central processing unit uses a high - performance microcontroller to receive the digital signals transmitted from the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data, calculate the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis; the power supply module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface.

[0023] In a specific embodiment, as Figures 1 - 2As shown, the wind speed and wind pressure detection device of the scissor-type portable air duct guiding device includes an air duct telescopic strut 1. Two air duct telescopic struts 1 are connected by screws 6. Multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 are fixedly installed in the struts. In the struts, multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 are connected to the monitoring signal storage and transmission module 4 through cable wires. The monitoring signal storage, processing and transmission module 4 is communicatively connected to a terminal outside the measured ventilation duct through cable wires 5 or a wireless network.

[0024] In this embodiment, the terminal is a computer, and a laptop, a desktop computer, a tablet computer, a smart phone, etc. can be selected. When the signal transmission mode is selected as the wireless transmission mode, it can adopt both the short-range wireless transmission modes such as Bluetooth transmission or WiFi transmission, and the long-range wireless transmission modes such as 4G or 5G networks. Furthermore, remote cross-regional measurement on the cloud platform can be realized, and the average wind speed and wind pressure of the ventilation duct can be viewed in real time on the computer.

[0025] In this embodiment, the air duct telescopic strut 1 serves as the main structure of the entire device and is a hollow cylindrical structural member composed of multiple telescopic rods. These telescopic rods can adjust their lengths through a certain mechanical structure (such as nested metal tubes, using friction or simple locking devices such as buttons and card slots) to meet the requirements of different usage scenarios and air ducts with different diameters.

[0026] As Figure 1 shown, two air duct telescopic struts 1 are connected together by screws 6 and are the fulcrums of the device. By adjusting the tightness of the screws, the tension between the struts can be controlled, making the device open and close more smoothly. Fixed buckles or adhesives for the air ducts can be provided at both ends of the struts to ensure a tight connection with the air ducts, without affecting the air supply function of the ventilation duct, and the wind speed and wind pressure of this section can be measured in real time. When in use, adjust the lengths of the two air duct telescopic struts 1 to the diameter of the measured ventilation device, and adjust the angles of the two air duct telescopic struts 1 to the vertical state and perpendicular to the cylindrical surface of the measured ventilation device. Ensure that the extended lengths of the telescopic rods are the same, and try to ensure that both the wind speed detection module 2 and the wind pressure detection module 3 are exposed. When the diameter of the measured ventilation device cannot ensure that both the wind speed detection module 2 and the wind pressure detection module 3 are exposed, the wind speed detection module 2 and the wind pressure detection module 3 close to the ventilation device may not be exposed, and the monitoring signal storage, processing and transmission module 4 can automatically not calculate the wind speed and wind pressure signals collected at this location. When not in use, as Figure 2 shown, the two air duct telescopic struts 1 shorten their lengths and remain parallel, which is convenient for carrying.

[0027] The wind speed detection module is built with a high-precision hot-wire anemometer sensor. This sensor adopts advanced micro-electro-mechanical system (MEMS) technology, can quickly respond to wind speed changes, and accurately measure the wind speed at the air outlet of the ventilation device. The wind speed detection module is also equipped with a signal processing circuit, which can convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module 4.

[0028] The wind pressure detection module 3 uses a piezoresistive pressure sensor to measure the wind pressure by sensing the pressure difference inside and outside the ventilation device. The pressure sensor features high precision and high sensitivity, and can accurately measure tiny pressure changes. The wind pressure detection module also has a signal processing circuit for converting the pressure signal into a digital signal and transmitting it to the monitoring signal storage, processing and transmission module 4.

[0029] Multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 are installed on the telescopic support rod 1 of the air duct. The installation quantity is 6 pieces of the wind speed detection module 2 and 6 pieces of the wind pressure detection module 3 for each support pipe. The system installs a total of 12 pieces of the wind speed detection module 2 and 12 pieces of the wind pressure detection module 3.

[0030] In this embodiment, the monitoring signal storage, processing and transmission module 4 connects multiple groups of wind speed detection modules 2 and multiple groups of wind pressure detection modules 3 through cable lines inside the hollow support rod. The monitoring signal storage, processing and transmission module 4 communicates and connects with a computer outside the measured ventilation duct through the cable line 5 or wireless network. The monitoring signal storage, processing and transmission module 4 is equipped with a central processing unit and a power supply module. The said central processing unit uses a high-performance microcontroller, receives the digital signals transmitted from the wind speed detection module and the wind pressure detection module, processes and analyzes the data using preset algorithms, calculates the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function, and can store the detection data in the internal memory for convenient data transmission and analysis; the power supply module uses a rechargeable lithium battery to supply power to the entire detection device, is provided with a charging interface, and can be charged through a common USB interface to ensure that the detection device can work continuously and stably in different environments.

[0031] The cable line 5 can transmit signals and the USB interface line for charging the power supply module.

[0032] As Figure 2 shown, the present invention also discloses a usage method of the wind speed and wind pressure detection device for the scissors-type portable air guiding device, including the following steps: Step 1: Extend the telescopic support rod 1 of the air duct of the portable scissors-type ventilation device wind speed and wind pressure detection device to the diameter of the measured ventilation device, and try to ensure that the extended lengths of the telescopic rods are consistent, and ensure that both the wind speed detection module 2 and the wind pressure detection module 3 are exposed; Step 2: Adjust the angle of the two telescopic struts 1 of the air duct to the vertical state by the screw 6, as Figure 1 ; Step 3: Fix the two ends of the two support rods to the inner cross-section of the measured ventilation device with buckles or adhesives to ensure that the device is perpendicular to the cylindrical surface of the measured ventilation device.

[0033] Step 4: Start the power supply, and the wind speed and wind pressure of the cross-section of the measured ventilation device can be viewed through the computer.

[0034] Step 5: If long-term monitoring is required, such as measuring the wind speed and wind pressure of the fan at the entrance of the axial flow fan at the tunnel opening, the process can end at Step 4; if it is temporary monitoring, the device needs to be recovered and continue to Step 6. For example, when measuring the wind speed and wind pressure of the ventilation duct at the tunnel face, as the tunnel face advances, the installation of the air duct also needs to advance with the progress of the tunnel face, then the portable scissor-type ventilation device wind speed and wind pressure detection device needs to be recovered and reinstalled. Step 6: Turn off the power supply, loosen the buckles or adhesives between the two ends of the two support rods and the measured ventilation device, and remove the device. Step 7: Adjust the angle of the two telescopic struts 1 of the air duct to the parallel state by the screw 6; Step 8: Shorten the two telescopic struts 1 of the air duct to the shortest length, as Figure 2 , and end.

[0035] When calculating the air leakage rate in a section of the ventilation device, such as the tunnel entrance air inlet and the tunnel face air outlet, the calculation method is as follows: Calculate the average air volume and average wind pressure of each monitoring section, and the formula is as follows: ; Among them, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average wind pressure of the monitoring section, with the unit of Pa; is the wind speed measured by each sensor in the monitoring section, with the unit of m / s; is the wind pressure measured by each sensor in the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , and ; Calculate the air leakage rate per 100 meters of the air duct in the monitoring section, and the formula is as follows: ; Among them, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, in percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the subsequent monitoring section, with the unit of m 3 / s; is the length of the air duct between the two monitoring sections, with the unit of m.

[0036] For the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that this application is not limited by the described action sequence, because according to this application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to this application.

[0037] In the above embodiments, the basic principles, main features and advantages of the present invention are described. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A wind speed and wind pressure detection device for a scissor type portable air guiding device, characterized in that, It includes two telescopic struts for air ducts connected by screws. Multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules are fixedly installed in the two telescopic struts for air ducts. The multiple groups of wind speed detection modules and multiple groups of wind pressure detection modules in the telescopic struts for air ducts are connected by cable wires and are also connected to the monitoring signal storage and transmission module. The monitoring signal storage, processing and transmission module is communicatively connected to the terminal outside the measured ventilation duct.

2. The wind speed and wind pressure detection device of a scissor-type portable air guiding device according to claim 1, characterized in that, The connection methods between the monitoring signal storage, processing and transmission module and the terminal include wired connection and wireless connection. The wired connection method includes cable wire connection. The wireless connection methods include short-range wireless transmission such as Bluetooth transmission or WiFi transmission and remote wireless transmission via 4G or 5G network.

3. The wind speed and wind pressure detection device of a scissor-type portable air guiding device according to claim 1, characterized in that, Each of the telescopic struts for air ducts is a hollow cylindrical structural member, composed of multiple telescopic rods for adjusting the length. The multiple telescopic rods are connected by a locking device.

4. The wind speed and wind pressure detection device of a scissors-type portable air guide device according to claim 3, characterized in that, The locking device includes a nested metal tube, a button and a card slot.

5. The wind speed and wind pressure detection device of a scissor-type portable air guiding device according to claim 1, characterized in that, The wind speed detection module is internally equipped with a high-precision hot-wire anemometer sensor to measure the wind speed at the air outlet of the ventilation device. It is also equipped with a signal processing circuit to convert the analog signal collected by the sensor into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

6. The wind speed and wind pressure detection device of a scissor-type portable air guiding device according to claim 1, characterized in that, The wind pressure detection module is provided with a piezoresistive pressure sensor to measure the wind pressure through the pressure difference inside and outside the ventilation device. It is also provided with a signal processing circuit to convert the pressure signal into a digital signal and transmit it to the monitoring signal storage, processing and transmission module.

7. The wind speed and wind pressure detection device of a scissors-type portable air guiding device according to claim 1, characterized in that The monitoring signal storage, processing and transmission module includes a central processing unit and a power supply module. The central processing unit uses a high-performance microcontroller to receive the digital signals transmitted from the wind speed detection module and the wind pressure detection module, and uses a preset algorithm to process and analyze the data, calculate the specific values of the wind speed and wind pressure. The central processing unit also has a data storage function to store the detection data in the internal memory for data transmission and analysis. The power supply module supplies power to the entire detection device, including a rechargeable lithium battery and a charging interface.

8. A method for using a wind speed and wind pressure detection device of a scissor-type portable air guiding device according to any one of claims 1 to 7, characterized in that, It includes the following steps: Step S1: Extend the telescopic struts for air ducts to the diameter length of the measured ventilation device, make the extended lengths of the telescopic rods consistent, and keep the wind speed detection module and the wind pressure detection module exposed. Step S2: Adjust the angles of the two telescopic struts for air ducts to the vertical state by screws. Step S3: Fix the two ends of the two telescopic struts for air ducts to the inner cross-section of the measured ventilation device with buckles or adhesives, so that the wind speed and wind pressure detection device of the scissor-type portable air guiding device is perpendicular to the cylindrical surface of the measured ventilation device. Step S4: Turn on the power supply and view the wind speed and wind pressure of the cross-section of the measured ventilation device through the terminal. Step S5: If long-term monitoring is required, keep the device in step 4 running. If it is for temporary monitoring and the device needs to be recycled, then go to step 6 to recycle the wind speed and wind pressure detection device of the scissor-type portable air guiding device and reinstall it when using it again. Step S6: Turn off the power supply, loosen the buckles or adhesive fixation between the two ends of the two telescopic struts for air ducts and the measured ventilation device, and remove the wind speed and wind pressure detection device of the scissor-type portable air guiding device. Step S7: Adjust the angles of the two telescopic struts of the air ducts to a parallel state by screws; Step S8: Shorten the two telescopic struts of the air ducts to the shortest length, and the detection is completed.

9. The method for using a wind speed and wind pressure detection device of a scissor-type portable air guiding device as described in claim 8, characterized in that, The calculation formulas for the wind speed and wind pressure of the cross-section of the measured ventilation device are as follows: ； Among them, is the average air volume of the monitoring section, with the unit of m 3 / s; is the average air pressure of the monitoring section, with the unit of Pa; is the wind speed measured by each sensor of the monitoring section, with the unit of m / s; is the air pressure measured by each sensor of the monitoring section, with the unit of Pa; n is the number of monitoring sensors; A is the cross-sectional area of the air duct, with the unit of m 2 , and .

10. The method for using a wind speed and wind pressure detection device of a scissors-type portable air guide device as described in claim 9, characterized in that, It also includes the calculation of the air leakage rate per 100 meters of the air duct, and the calculation formula is: ； Among them, is the air leakage rate per 100 meters of the air duct between any two adjacent monitoring sections, in percentage; is the average air volume of the previous monitoring section, with the unit of m 3 / s; is the average air volume of the subsequent monitoring section, with the unit of m 3 / s; is the length of the air duct between the two monitoring sections, with the unit of m.

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