An airport runway water film thickness monitoring device

Abstract

The application relates to the technical field of airport simulation experiment, and provides an airport runway water film thickness monitoring device. The airport runway water film thickness monitoring device comprises a supporting mechanism, a runway simulation mechanism, a plurality of grating water level meters, a wind simulation mechanism, a water circulation mechanism, a spraying rainfall mechanism, the supporting mechanism comprises a supporting assembly and a measuring cylinder, the supporting assembly is fixedly installed on the ground, the measuring cylinder is installed at one end of the supporting assembly, the runway simulation mechanism is fixedly installed at the top of the supporting assembly, the runway water film thickness can be monitored in real time through the grating water level meters, the water distribution and the change trend can be understood by an operator, the inclination of a runway test piece can be adjusted by adjusting the height of a runway supporting column, the airport slope adjustment can be simulated, the simulated environment can be adjusted, and the rainfall and the wind can be simulated simultaneously through a water pump and a fan, so that the simulation demand of the multiple environment of the airport runway can be met.

Description

An airport runway water film thickness monitoring device Technical Field

[0001] This invention relates to the field of airport simulation experiment technology, and in particular to a device for monitoring the thickness of water film on airport runways. Background Technology

[0002] When it rains, a layer of water film forms on the surface of the airport runway. According to NASA's hydroplaning speed model, when the thickness of the water film exceeds 3mm, aircraft will skid during takeoff and landing. For the safe operation of the airport runway, simulation experiments need to be conducted during the construction of the airport to monitor whether the thickness of the water film meets the safety requirements for aircraft.

[0003] Current airport runway water film thickness monitoring devices cannot flexibly adjust the runway slope angle. The existing monitoring devices simulate rainfall processes with constant rainfall intensity, which cannot simulate the changing rainfall processes in reality. Furthermore, the existing monitoring devices do not consider the simulation of wind fields and cannot simulate the impact of wind fields on water film thickness. Summary of the Invention

[0004] Therefore, it is necessary to provide an airport runway water film thickness monitoring device to solve at least one of the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An airport runway water film thickness monitoring device includes a support mechanism, a runway simulation mechanism, several grating water level gauges, a wind simulation mechanism, a water circulation mechanism, and a spraying and rainfall mechanism. The support mechanism includes a support component and a measuring cylinder. The support component is fixedly installed on the ground, and the measuring cylinder is installed at one end of the support component. The runway simulation mechanism is fixedly installed on the top of the support component and is used to simulate an airport runway. Several grating water level gauges are installed on the top of the runway simulation mechanism and are used to monitor water level changes within the runway simulation mechanism. The wind simulation mechanism is fixedly installed at the end of the runway simulation mechanism away from the measuring cylinder and is used to simulate wind on the airport runway. One end of the water circulation mechanism is connected to the top of the runway simulation mechanism. The spraying and rainfall mechanism is fixedly installed on the top of the runway simulation mechanism and is used to simulate rainfall on the airport runway.

[0007] Preferably, the support assembly includes four fixed support legs, a fixed support plate, and a mounting connecting plate. The four fixed support legs are all fixedly installed on the ground. The four corners of the fixed support plate are respectively fixedly installed on the top of the four fixed support legs. The mounting connecting plate is fixedly installed on one end of the fixed support plate. The mounting connecting plate is connected to the measuring cylinder.

[0008] Preferably, the runway simulation mechanism includes three runway support columns, an adjustable slope structure, a runway specimen, a wind shield, and a flow divider. The three runway support columns are installed at equal intervals on the top of a fixed support plate. The adjustable slope structure is fixedly installed on the top of the three runway support columns. The runway specimen is fixedly installed on the top of the adjustable slope structure. The runway specimen is used to simulate an airport runway. The wind shield is fixedly installed on both side walls of the adjustable slope structure, forming a simulated gap between the wind shield and the runway specimen. The flow divider is fixedly installed on the end of the runway specimen near the measuring cylinder, and the flow divider is located on the top of the measuring cylinder.

[0009] Preferably, the wind simulation mechanism includes a rectifier net, a wind turbine mounting block, and a fan. The rectifier net is fixedly installed at the end of the wind shield away from the splitter plate and is used to guide the gas flow. The wind turbine mounting block is fixedly installed on the side wall of the rectifier net away from the splitter plate, and the fan is fixedly installed inside the wind turbine mounting block.

[0010] Preferably, the water circulation mechanism includes a reservoir simulation box, a water supply pipe, a water pump, and a flow meter. The reservoir simulation box is located below the measuring cylinder. One end of the water supply pipe is connected to the interior of the reservoir simulation box, and the other end is connected to the top of the windproof cover. The water pump is installed in the middle of the water supply pipe, and the flow meter is installed in the middle of the water supply pipe, with the flow meter located on the side of the water pump away from the reservoir simulation box.

[0011] Preferably, a spray chamber is provided inside the windshield, and one end of the water supply pipe passes through the top of the windshield and communicates with the spray chamber. The spray rain mechanism includes several nozzles, which are installed at equal intervals on the top of the simulated gap, and the top of the nozzles communicates with the spray chamber.

[0012] Preferably, the adjustable slope structure includes a slope support base plate, an adjustment drive assembly, two adjustment support arms, a slope connecting plate, two positioning components, and a wind guiding assembly. The slope support base plate is fixedly installed on the top of the three runway support columns. The adjustment drive assembly is fixedly installed on the top of the slope support base plate near the wind turbine. The two adjustment support arms are fixedly installed on both sides of the top of the slope support base plate. The slope connecting plate is installed on the top of the adjustment drive assembly, and the end of the slope connecting plate away from the wind turbine is rotatably installed on the two adjustment support arms. The runway specimen is fixedly installed on the top of the slope connecting plate. The runway specimen and the slope connecting plate are slidably mounted on the side walls of the two adjustment support arms facing each other. The two positioning components are installed inside the two adjustment support arms, and the top of the positioning components extends upward through the top of the adjustment support arms. The two positioning components are symmetrically arranged. The two ends of the wind guiding assembly are rotatably installed on the top of the inner side walls of the wind shield facing each other. The inner side walls of the wind shield are fixedly installed on the side walls of the two adjustment support arms.

[0013] Preferably, the adjustment drive assembly includes an adjustment motor, two adjustment support seats, an adjustment screw, an adjustment moving block, two adjustment telescopic rods, and an adjustment mounting block. The adjustment motor is fixedly installed on the top of the slope support base plate near the fan end. The two adjustment support seats are fixedly installed on the top of the slope support base plate and are spaced apart. The two ends of the adjustment screw are rotatably installed in the middle of the adjustment screw, and the output shaft of the adjustment motor is fixedly connected to one end of the adjustment screw. The adjustment moving block is threaded onto the adjustment screw and is slidably disposed on the top of the slope support base plate. The bottoms of the two adjustment telescopic rods are rotatably installed on the adjustment moving block. On the front and rear side walls, the front and rear side walls of the adjusting mounting block are respectively rotatably mounted on the top of two adjusting telescopic rods, and the top of the adjusting mounting block is fixedly connected to the bottom of the slope connecting plate. The adjusting telescopic rods include an inner telescopic rod, an outer telescopic rod, and a telescopic spring. One end of the inner telescopic rod is rotatably mounted on the side wall of the adjusting moving block, and one end of the outer telescopic rod is rotatably mounted on the side wall of the adjusting mounting block. A telescopic groove is opened at the end of the outer telescopic rod away from the slope connecting plate, and the telescopic spring is fixedly mounted in the inner end of the telescopic groove. The end of the inner telescopic rod away from the adjusting motor passes through the telescopic groove and is fixedly connected to the telescopic spring. The inner telescopic rod slides in cooperation with the side wall of the telescopic groove.

[0014] Preferably, the top of the adjusting support arm has a rotating groove, and the inside of the adjusting support arm has a toggle groove, with the inner side of the toggle groove communicating with the rotating groove. Several positioning slots are provided on the sidewalls of the two adjusting support arms facing each other, and these positioning slots are spaced apart vertically. Several positioning sliding grooves are also provided inside the adjusting support arm, with one side of each positioning sliding groove communicating with a positioning slot, and the other side of each positioning sliding groove communicating with the toggle groove. The positioning assembly includes a linkage rod, a linkage bevel gear, a toggle rod, several positioning springs, several positioning protrusions, and several sliding blocks. The linkage rod is rotatably mounted in the rotating groove via a torsion spring, the linkage bevel gear is fixedly mounted on the top of the linkage rod, and the toggle rod is fixedly mounted on the sidewall of the linkage rod. At the bottom, the actuating rod is located in the actuating groove. Several positioning springs are fixedly installed on the inner ends of several positioning slots. Several positioning protrusions are fixedly installed on several positioning springs, and the positioning protrusions are slidably set on the side wall of the positioning slot. Several sliding blocks are inserted into the side wall of several positioning protrusions, and the sliding blocks are slidably set in several positioning grooves. Several sliding blocks abut against one side wall of the actuating rod. The end of the positioning protrusion away from the positioning spring forms a positioning hemisphere, which is located on the outside of the positioning slot. The slope connecting plate has positioning strip grooves on the side walls facing the two adjusting support arms. One positioning hemisphere of several positioning protrusions on the same side can be inserted into the corresponding positioning strip groove for positioning.

[0015] Preferably, the wind guiding assembly includes a guiding shaft, two passive bevel gears, and a wind guiding plate. The two ends of the guiding shaft are rotatably mounted on the top of the inner sidewalls of the windshield facing each other. The two passive bevel gears are fixedly mounted on the two ends of the guiding shaft and are symmetrically arranged. The two passive bevel gears mesh with two linkage bevel gears respectively. The wind guiding plate is fixedly mounted on the middle of the sidewall of the guiding shaft.

[0016] The advantages of this invention compared to the prior art are:

[0017] 1. By simulating the water layer thickness of newly built airport runways under different rainfall intensities and wind speeds, builders can more comprehensively assess the safety of airport runways under different weather conditions, thereby taking corresponding measures to ensure the safety of aircraft take-off and landing. The application of water circulation mechanisms can effectively collect and reuse discharged water, avoiding waste of water resources and conforming to the concept of sustainable development. Grating water level gauges can accurately detect the surface water layer thickness on the simulated runway, making the study of water layer thickness more accurate and reliable. Spraying rainfall mechanisms can simulate rainfall weather and simulate changing rainfall processes, which helps to simulate the airport's weather environment in real time, and then conduct corresponding experiments and research. Through simulation experiments, the safety and reliability of airport construction can be improved, providing technical support for the safe operation of airport runways.

[0018] 2. The grating level gauge can monitor the runway water film thickness in real time, helping operators understand the water distribution and changing trends. After the water flows through the runway specimen, it is collected in a measuring cylinder. The water is then returned to the reservoir simulation tank for recycling through the valve at the bottom of the measuring cylinder, realizing the recycling of water resources. The inclination of the runway specimen can be adjusted by adjusting the height of the runway support columns, realizing the adjustment of the simulated airport slope, thereby enabling fine-tuning of the simulated environment. Water pumps and fans can simultaneously simulate rainfall and wind, meeting the simulation needs of diverse airport runway environments.

[0019] 3. The adjustable slope structure allows for convenient adjustment of experimental parameters, improving operational flexibility and efficiency. A fan dries the water on the track specimen, preventing moisture from affecting subsequent experimental results. Starting the adjusting motor, the rotation of the adjusting screw and the movement of the adjusting block cause the adjusting telescopic rod to flip. Once the tension of the telescopic spring is fully released, the slope connecting plate quickly flips, causing the track specimen to flip upwards, achieving rapid adjustment and stopping. The track specimen, due to inertia, flings water upwards, increasing the drying area, improving the fan's drying effect, accelerating evaporation and drying, and increasing experimental efficiency. The design of the positioning protrusion and positioning hemisphere ensures accurate positioning of the slope connecting plate.

[0020] 4. By guiding the airflow of the fan downwards towards the runway specimen, more air can reach the upper surface of the runway specimen, removing more moisture and improving the drying efficiency. This allows for rapid drying of the runway specimen, preventing excess moisture from affecting subsequent experiments and thus improving experimental efficiency. Attached Figure Description

[0021] Figure 1 is a schematic diagram of an embodiment of the present invention.

[0022] Figure 2 is a cross-sectional structural diagram of an embodiment of the present invention.

[0023] Figure 3 is a schematic diagram of the adjustable slope structure, runway test specimen and wind shield of another embodiment of the present invention.

[0024] Figure 4 is a partial cross-sectional structural diagram of the adjustable slope structure, runway specimen, and wind shield according to another embodiment of the present invention.

[0025] Figure 5 is a cross-sectional structural diagram of the adjustable telescopic rod according to another embodiment of the present invention.

[0026] Figure 6 is a partial cross-sectional view of the adjustable slope structure, runway specimen, and wind shield from another perspective of another embodiment of the present invention.

[0027] Figure 7 is a partial cross-sectional structural schematic diagram of another embodiment of the present invention.

[0028] Figure 8 is a magnified view of part A in Figure 2.

[0029] In the diagram: 10. Support mechanism; 20. Runway simulation mechanism; 30. Grating water level gauge; 40. Wind simulation mechanism; 50. Water circulation mechanism; 60. Sprinkler and rain mechanism; 11. Support assembly; 12. Measuring cylinder; 111. Fixed support leg; 112. Fixed support plate; 113. Mounting connection plate; 21. Runway support column; 70. Adjustable slope structure; 22. Runway specimen; 23. Wind shield; 24. Diverter plate; 231. Simulation gap; 41. Rectifier net; 42. Wind turbine mounting block; 43. Fan; 51. Reservoir simulation box; 52. Water supply pipe; 53. Water pump; 54. Flow meter; 232. Sprinkler chamber; 61. Sprinkler head; 71. Slope support base plate; 72. Adjustment drive assembly; 73. Adjustment support arm; 74. Slope 75. Connecting plate; 76. Positioning assembly; 77. Wind guiding assembly; 78. Adjusting motor; 79. Adjusting support base; 70. Adjusting screw; 71. Adjusting moving block; 72. Adjusting telescopic rod; 73. Adjusting mounting block; 74. Telescopic inner rod; 75. Telescopic outer rod; 76. Telescopic spring; 77. Telescopic slide rail; 78. Rotating groove; 79. Actuating circular groove; 70. Positioning slot; 71. Positioning slide rail; 72. Linkage rotating rod; 73. Linkage bevel gear; 74. Actuating rod; 75. Positioning spring; 76. Positioning convex rod; 77. Sliding block; 78. Positioning hemispherical surface; 79. Positioning strip groove; 70. Guide shaft; 71. Passive bevel gear; 72. Wind guiding plate. Detailed Implementation

[0030] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] This invention provides an airport runway water film thickness monitoring device, as shown in Figures 1 to 8. It includes a support mechanism 10, a runway simulation mechanism 20, several grating water level gauges 30, a wind simulation mechanism 40, a water circulation mechanism 50, and a spraying and rainfall mechanism 60. The support mechanism 10 includes a support component 11 and a measuring cylinder 12. The support component 11 is fixedly installed on the ground, and the measuring cylinder 12 is installed at one end of the support component 11. The runway simulation mechanism 20 is fixedly installed on the top of the support component 11 and is used to simulate airport runway thickness. A number of grating water level gauges 30 are installed on the top of the runway simulation mechanism 20. The grating water level gauges 30 are used to monitor the water level changes in the runway simulation mechanism 20. The wind simulation mechanism 40 is fixedly installed at the end of the runway simulation mechanism 20 away from the measuring cylinder 12. The wind simulation mechanism 40 is used to simulate the wind on the airport runway. One end of the water circulation mechanism 50 is connected to the top of the runway simulation mechanism 20. The spray rain mechanism 60 is fixedly installed on the top of the runway simulation mechanism 20. The spray rain mechanism 60 is used to simulate the rain on the airport runway.

[0034] The support assembly 11 includes four fixed support legs 111, a fixed support plate 112, and a mounting connection plate 113. The four fixed support legs 111 are all fixedly installed on the ground. The four corners of the fixed support plate 112 are respectively fixedly installed on the top of the four fixed support legs 111. The mounting connection plate 113 is fixedly installed on one end of the fixed support plate 112. The mounting connection plate 113 is connected to the measuring cylinder 12.

[0035] The runway simulation mechanism 20 includes three runway support columns 21, an adjustable slope structure 70, a runway specimen 22, a wind shield 23, and a flow divider 24. The three runway support columns 21 are installed at equal intervals on the top of the fixed support plate 112. The adjustable slope structure 70 is fixedly installed on the top of the three runway support columns 21. The runway specimen 22 is fixedly installed on the top of the adjustable slope structure 70. The runway specimen 22 is used to simulate an airport runway. The wind shield 23 is fixedly installed on both side walls of the adjustable slope structure 70. A simulated gap 231 is formed between the wind shield 23 and the runway specimen 22. The flow divider 24 is fixedly installed on the end of the runway specimen 22 near the measuring cylinder 12, and the flow divider 24 is located on the top of the measuring cylinder 12.

[0036] The wind simulation mechanism 40 includes a rectifier net 41, a wind power mounting block 42, and a fan 43. The rectifier net 41 is fixedly installed on the end of the wind shield 23 away from the diverter plate 24 and is used to guide the gas flow. The wind power mounting block 42 is fixedly installed on the side wall of the rectifier net 41 away from the diverter plate 24, and the fan 43 is fixedly installed inside the wind power mounting block 42.

[0037] The water circulation mechanism 50 includes a reservoir simulation box 51, a water supply pipe 52, a water pump 53, and a flow meter 54. The reservoir simulation box 51 is located below the measuring cylinder 12. One end of the water supply pipe 52 is connected to the interior of the reservoir simulation box 51, and the other end is connected to the top of the wind shield 23. The water pump 53 is installed in the middle of the water supply pipe 52, and the flow meter 54 is installed in the middle of the water supply pipe 52, with the flow meter 54 located on the side of the water pump 53 away from the reservoir simulation box 51.

[0038] The wind shield 23 has a spray chamber 232 inside. One end of the water supply pipe 52 passes through the top of the wind shield 23 and is connected to the spray chamber 232. The spray rain mechanism 60 includes a number of nozzles 61. The nozzles 61 are installed at equal intervals on the top of the simulated gap 231, and the top of the nozzles 61 is connected to the spray chamber 232.

[0039] The adjustable slope structure 70 includes a slope support base plate 71, an adjustment drive assembly 72, two adjustment support arms 73, a slope connecting plate 74, two positioning assemblies 75, and a wind-guided assembly 76. The slope support base plate 71 is fixedly installed on the top of the three runway support columns 21. The adjustment drive assembly 72 is fixedly installed on the top end of the slope support base plate 71 near the wind turbine 43. The two adjustment support arms 73 are respectively fixedly installed on both sides of the top of the slope support base plate 71. The slope connecting plate 74 is installed on the top of the adjustment drive assembly 72, and the end of the slope connecting plate 74 away from the wind turbine 43 is rotatably installed on the two adjustment arms 76. On the support arm 73, the runway test piece 22 is fixedly installed on the top of the slope connecting plate 74. Both the runway test piece 22 and the slope connecting plate 74 are slidably set on the side wall of the two adjusting support arms 73 facing each other. Two positioning components 75 are respectively installed inside the two adjusting support arms 73, and the top of the positioning component 75 extends upward through the top of the adjusting support arm 73. The two positioning components 75 are symmetrically arranged. The two ends of the wind guiding component 76 are respectively rotatably installed on the top of the inner side wall of the wind shield 23 facing each other. The inner side walls of the wind shield 23 are respectively fixedly installed on the side wall of the two adjusting support arms 73.

[0040] The adjustment drive assembly 72 includes an adjustment motor 721, two adjustment support seats 722, an adjustment screw 723, an adjustment moving block 724, two adjustment telescopic rods 725, and an adjustment mounting block 726. The adjustment motor 721 is fixedly installed on the top of the slope support base plate 71 near the fan 43. The two adjustment support seats 722 are fixedly installed on the top of the slope support base plate 71 and are spaced apart. The two ends of the adjustment screw 723 are rotatably installed in the middle of the adjustment screw 723, and the output shaft of the adjustment motor 721 is fixedly connected to one end of the adjustment screw 723. The adjustment moving block 724 is threaded onto the adjustment screw 723 and slides on the top of the slope support base plate 71. The bottoms of the two adjustment telescopic rods 725 are rotatably installed on the front and rear ends of the adjustment moving block 724. On both side walls, the front and rear side walls of the adjusting mounting block 726 are rotatably mounted on the top of the two adjusting telescopic rods 725, and the top of the adjusting mounting block 726 is fixedly connected to the bottom of the slope connecting plate 74. The adjusting telescopic rod 725 includes an inner telescopic rod 727, an outer telescopic rod 728, and a telescopic spring 729. One end of the inner telescopic rod 727 is rotatably mounted on the side wall of the adjusting moving block 724, and one end of the outer telescopic rod 728 is rotatably mounted on the side wall of the adjusting mounting block 726. The end of the outer telescopic rod 728 away from the slope connecting plate 74 has a telescopic groove 720. The telescopic spring 729 is fixedly mounted on the inner end of the telescopic groove 720. The end of the inner telescopic rod 727 away from the adjusting motor 721 passes through the telescopic groove 720 and is fixedly connected to the telescopic spring 729. The inner telescopic rod 727 slides in cooperation with the side wall of the telescopic groove 720.

[0041] The top of the adjusting support arm 73 is provided with a rotating groove 731, and the inside of the adjusting support arm 73 is provided with a turning circular groove 732, the inner side of which communicates with the rotating groove 731. Several positioning slots 733 are provided on the sidewalls of the two adjusting support arms 73 facing each other, and these positioning slots 733 are spaced apart vertically. Several positioning sliding grooves 734 are also provided inside the adjusting support arm 73, and one side of each positioning sliding groove 734 is connected to one of the positioning slots 733. The other side of each of the several positioning grooves 734 is connected to the actuating circular groove 732. The positioning assembly 75 includes a linkage rotating rod 751, a linkage bevel gear 752, an actuating rod 753, several positioning springs 754, several positioning protrusions 755, and several sliding blocks 756. The linkage rotating rod 751 is rotatably mounted in the rotating groove 731 via a torsion spring. The linkage bevel gear 752 is fixedly mounted on the top of the linkage rotating rod 751, and the actuating rod 753 is fixedly mounted on the side of the linkage rotating rod 751. At the bottom of the wall, the actuating rod 753 is located within the actuating groove 732. Several positioning springs 754 are fixedly installed at the inner ends of several positioning slots 733. Several positioning protrusions 755 are fixedly installed on the positioning springs 754, and the positioning protrusions 755 are slidably disposed on the side wall of the positioning slots 733. Several sliding blocks 756 are inserted into the side walls of the positioning protrusions 755, and the sliding blocks 756 are slidably disposed in the positioning grooves 732. Inside 4, several sliding blocks 756 abut against one side wall of the actuating rod 753. The end of the positioning protrusion 755 away from the positioning spring 754 forms a positioning hemisphere 757. The positioning hemisphere 757 is located outside the positioning slot 733. The slope connecting plate 74 has positioning strip grooves 741 on both sides of the two adjusting support arms 73. One of the positioning hemispheres 757 of the several positioning protrusions 755 on the same side can be inserted into the corresponding positioning strip groove 741 for positioning.

[0042] The wind guiding assembly 76 includes a guiding shaft 761, two passive bevel gears 762, and a wind guiding plate 763. The two ends of the guiding shaft 761 are rotatably mounted on the top of the inner sidewalls of the windshield 23 facing each other. The two passive bevel gears 762 are fixedly mounted on the two ends of the guiding shaft 761, and the two passive bevel gears 762 are symmetrically arranged. The two passive bevel gears 762 mesh with two linkage bevel gears 752 respectively. The wind guiding plate 763 is fixedly mounted on the middle of the sidewall of the guiding shaft 761.

[0043] In one embodiment, the operator can use this device to monitor the surface water layer of the simulated airport runway under simulated airport weather conditions. Since the surface water layer thickness exceeds 3mm, aircraft will experience skidding during takeoff and landing. Therefore, multiple experiments are needed during airport construction to study the water layer thickness of the newly built airport runway under different rainfall intensities and wind speeds, providing technical support for the safe operation of the airport runway. The runway simulation mechanism 20 is used to simulate the airport runway, the grating water level gauge 30 is used to detect the surface water layer thickness on the simulated runway, and the wind simulation mechanism 40 is used to simulate wind speed. Because it is necessary to detect the water film thickness of the airport runway under different wind speed conditions, the wind simulation mechanism 40 can be adjusted to generate different wind speeds. The water circulation mechanism 50 can collect and reuse the water discharged from the runway simulation mechanism 20 to prevent... The sprinkler system 60, designed to simulate rainfall, helps builders comprehensively assess the safety of airport runways under different weather conditions by simulating the water layer thickness under varying rainfall intensities and wind speeds. This allows for the implementation of appropriate measures to ensure safe takeoffs and landings. The water circulation system 50 effectively collects and reuses discharged water, preventing waste and aligning with sustainable development principles. The grating water level gauge 30 accurately detects the surface water layer thickness on the simulated runway, making the study more accurate and reliable. The sprinkler system 60 simulates rainfall, facilitating real-time simulation of airport weather conditions for conducting experiments and research. These simulations enhance the safety and reliability of airport construction, providing technical support for the safe operation of airport runways.

[0044] The wind shield 23 blocks the top and sides of the model from the outside, forming a closed and continuous simulated gap 231. Within the simulated gap 231, the wind speed is kept uniform and stable. A rectifier net 41 is arranged behind the fan 43 to adjust the wind speed to a uniform wind speed field. The water pump 53 uses PVC pipes for its pipeline. Water depth measuring points are located at distances of 2m, 7m, and 12m from the rectifier net 41. The water level changes are recorded by setting up a grating water level meter 30 at the measuring point. When the water droplet diameter of the nozzle 61 is less than 0.02mm, the water droplets will not fall to the ground but will directly form mist. This makes it easy to absorb heat from the air and evaporate, without increasing the surface humidity. When the water droplet diameter is greater than 0.15mm, the water droplets will fall directly to the ground. Based on the above analysis, it can be concluded that the water droplet diameter of the nozzle 61 should be 0.15~2mm in the field artificial rainfall test.

[0045] In one embodiment, all three runway support columns 21 are adjustable telescopic support assemblies. Adjusting the height of the three runway support columns 21 allows the adjustable slope structure 70 to tilt. After the adjustable slope structure 70 tilts, the runway specimen 22 tilts, thereby adjusting the airport slope. Furthermore, the adjustable slope structure 70 can further adjust the tilt of the runway specimen 22. That is, when a small angle adjustment of the slope angle is required, it can be directly adjusted through the adjustable slope structure 70. After the slope of the simulated airport runway is adjusted, the operator turns on the water pump 53 and the fan 43. The water pump 53 pumps water from the reservoir simulation tank 51 and introduces it into the spray chamber 232 through the water supply pipe 52. Then, it is sprayed into the simulation gap 231 through several nozzles 61 to simulate rainfall. The fan 43 generates wind and blows it into the simulation gap 231 through the rectifier net 41 to simulate wind. During this process, the grating water level gauge 30 can monitor the runway water level at the corresponding point. The water film thickness is measured by the flow of water falling onto the runway specimen 22. The water flows downwards at an angle, passes through the diverter plate 24, and finally falls into the measuring cylinder 12 for water collection. The measuring cylinder 12 can measure the total amount of water, and a valve is installed at the bottom of the measuring cylinder 12. After the measurement is completed, the valve can be opened to recirculate the water back into the reservoir simulation tank 51 for recycling, thus completing one simulation. In this case, the grating water level gauge 30 can monitor the runway water film thickness in real time, helping operators understand the distribution and changing trend of water. After the water flows through the runway specimen 22, it will be collected into the measuring cylinder 12. The water is then recirculated into the reservoir simulation tank 51 through the valve at the bottom of the measuring cylinder 12 for recycling, realizing the recycling of water resources. The inclination of the runway specimen 22 can be adjusted by adjusting the height of the runway support column 21 to achieve the adjustment of the simulated airport slope, thereby enabling fine adjustment of the simulated environment. The water pump 53 and the fan 43 can simultaneously simulate rainfall and wind, meeting the simulation needs of diverse airport runway environments.

[0046] In another embodiment, since the experiment of simulating airport runway water film thickness monitoring requires multiple experiments by adjusting different rainfall, wind speeds, and slopes, the operator can directly adjust the slope angle through the adjustable slope structure 70 when making small adjustments. After completing one experiment, the operator turns off the water pump 53 to stop the simulated rainfall, but does not turn off the fan 43. The fan 43 can dry the water on the runway specimen 22 and also blow the water downwards, thus avoiding residual moisture from affecting the results of the next experiment. However, some water will adhere to the runway specimen 22, and drying it by the fan 43 alone will take a long time, affecting the efficiency of the experiment. When the operator makes small adjustments to the slope angle, the adjustment mechanism can be activated. Motor 721, when adjusted, drives adjusting screw 723 to rotate. Rotation of adjusting screw 723 moves adjusting block 724 on slope support base plate 71. Adjusting block 724 causes adjusting telescopic rod 725 to flip. This flipping of telescopic rod 725 tends to cause the end of slope connecting plate 74 near fan 43 to flip upwards. However, because the positioning groove 741 of slope connecting plate 74 has a positioning hemispherical surface 757 of positioning protrusion 755, the flipping of telescopic rod 725 cannot immediately cause slope connecting plate 74 to flip upwards. The telescopic rod 725 flips while slope connecting plate 74 does not, causing inner telescopic rod 727 to move inwards into telescopic slide groove 720. The extension spring 729 is compressed, causing it to generate elastic force. The positioning hemisphere 757 engages with the positioning slot 741. A positioning spring 754 is also provided at the other end of the positioning protrusion 755. Therefore, when the extension spring 729 is compressed to a certain extent and generates significant elastic force, the positioning slot 741 of the slope connecting plate 74 abuts against the positioning hemisphere 757, causing the positioning protrusion 755 to move towards the inner end of the positioning slot 733 and compress the positioning spring 754. When the positioning protrusion 755 is fully inserted into the positioning slot 733, the elastic force of the extension spring 729 is completely released, causing the extension rod 728 to move upwards. The extension rod 728 can then cause the slope connecting plate 74 to flip upwards. The slope connecting plate 74 can cause the track specimen 22 to flip upwards until the upper positioning protrusion 755 is engaged in the positioning slot 741 of the slope connecting plate 74. At this time, the track specimen 22 completes the adjustment of one slope angle. The distance between each adjacent positioning protrusion 755 from top to bottom corresponds to one slope angle, allowing the operator to better adjust the slope angle. In addition, during the process of the release of the elastic force to make the track specimen 22 flip upwards and stop instantly, the telescopic spring 729 can use inertia to throw the water on the track specimen 22 upwards, increasing the drying area of ​​the water on the track specimen 22. This makes it easier for the fan 43 to dry the water on the track specimen 22, improving the drying efficiency and thus improving the experimental efficiency.This design utilizes an adjustable slope structure 70 to facilitate the adjustment of experimental parameters, improving operational flexibility and efficiency. A fan 43 dries the water on the track specimen 22, preventing moisture from affecting subsequent experimental results. Activating the adjusting motor 721, through the rotation of the adjusting screw 723 and the movement of the adjusting block 724, causes the adjusting telescopic rod 725 to flip. When the tension of the telescopic spring 729 is fully released, the slope connecting plate 74 quickly flips, causing the track specimen 22 to flip upwards, achieving rapid adjustment and stopping. The track specimen 22, through inertia, flings water upwards, increasing the drying area, improving the drying effect of the fan 43, accelerating the evaporation and drying process, and improving experimental efficiency. The design of the positioning protrusion 755 and the positioning hemisphere 757 ensures accurate positioning of the slope connecting plate 74.

[0047] In another embodiment, when the positioning protrusion 755 moves towards the inner end of the positioning slot 733, the positioning protrusion 755 can drive the sliding block 756 to move away from the simulated gap 231. The movement of the sliding block 756 can actuate the actuating rod 753, causing the actuating rod 753 to drive the linkage rotating rod 751 to rotate. The rotation of the linkage rotating rod 751 can drive the linkage bevel gear 752 to rotate. The linkage bevel gear 752 can drive the driven bevel gear 762 meshing with it to rotate. The driven bevel gear 762 can drive the guide shaft 761 to rotate. The guide shaft 761 can drive the wind guide plate 763 to flip downward. After the wind guide plate 763 flips, it can guide the wind blown by the fan 43 to tilt downward. The air is blown towards the runway specimen 22, allowing more air to contact the upper surface of the runway specimen 22 and remove more moisture, thereby improving the drying efficiency of the runway specimen 22 and quickly drying it. This prevents excess moisture from affecting the next experiment and improves experimental efficiency. In this design, the air from the fan 43 is directed downwards towards the runway specimen 22, allowing more air to contact the upper surface of the runway specimen 22 and remove more moisture, thereby improving the drying efficiency of the runway specimen 22 and quickly drying it. This prevents excess moisture from affecting the next experiment and improves experimental efficiency.

[0048] During installation, all four fixed support legs 111 are fixedly installed on the ground. The four corners of the fixed support plate 112 are respectively fixedly installed on the top of the four fixed support legs 111. The mounting connecting plate 113 is fixedly installed on one end of the fixed support plate 112. The three runway support columns 21 are installed at equal intervals on the top of the fixed support plate 112. The runway specimen 22 is fixedly installed on the top of the adjustable slope structure 70. The wind shield 23 is fixedly installed on the two side walls of the adjustable slope structure 70. The diverter plate 24 is fixedly installed on the runway specimen 22 near the measuring cylinder 1. At one end of 2, the rectifier net 41 is fixedly installed on the end of the wind shield 23 away from the diverter plate 24, the wind power mounting block 42 is fixedly installed on the side wall of the rectifier net 41 away from the diverter plate 24, the fan 43 is fixedly installed inside the wind power mounting block 42, the reservoir simulation box 51 is set below the measuring cylinder 12, one end of the water supply pipe 52 is connected to the inside of the reservoir simulation box 51, the water pump 53 is installed in the middle of the water supply pipe 52, the flow meter 54 is installed in the middle of the water supply pipe 52, and several nozzles 61 are installed at equal intervals on the top of the simulation gap 231.

[0049] A slope support base plate 71 is fixedly installed on the top of three runway support columns 21. Two adjustable support arms 73 are fixedly installed on both sides of the top of the slope support base plate 71. A slope connecting plate 74 is installed on the top of the adjusting drive assembly 72. An adjusting motor 721 is fixedly installed on the top of the slope support base plate 71 near the fan 43. Two adjusting support seats 722 are fixedly installed on the top of the slope support base plate 71. The two ends of the adjusting screw 723 are rotatably installed on the middle of the adjusting screw 723. An adjusting moving block 724 is threaded onto the adjusting screw 723. The bottoms of two adjusting telescopic rods 725 are rotatably installed on the front and rear side walls of the adjusting moving block 724. The front and rear side walls of the adjusting mounting block 726 are rotatably installed on the top of the two adjusting telescopic rods 725. One end of the telescopic inner rod 727 is rotatably installed on the side wall of the adjusting moving block 724. One end of the telescopic outer rod 728 is rotatably installed on the adjusting mounting block 726. On the side wall of block 726, a telescopic spring 729 is fixedly installed at the inner end of the telescopic slide groove 720; a linkage rod 751 is rotatably installed in the rotating groove 731 via a torsion spring; a linkage bevel gear 752 is fixedly installed at the top of the linkage rod 751; a toggle rod 753 is fixedly installed at the bottom of the side wall of the linkage rod 751; several positioning springs 754 are respectively fixedly installed at the inner ends of several positioning slots 733; and several positioning protrusions 755 are respectively fixedly installed at the inner ends of several positioning slots 733. On the positioning spring 754, several sliding blocks 756 are respectively inserted into the side walls of several positioning protrusions 755. Several sliding blocks 756 abut against one side wall of the actuating rod 753. The two ends of the guide shaft 761 are respectively rotatably installed on the top of the inner side walls of the windshield 23 facing each other. Two passive bevel gears 762 are respectively fixedly installed on the two ends of the guide shaft 761. The wind guide plate 763 is fixedly installed in the middle of the side wall of the guide shaft 761.

[0050] This project can achieve the following: 1. By simulating the water layer thickness of a newly built airport runway under different rainfall intensities and wind speeds, it can help builders more comprehensively assess the safety of the airport runway under different weather conditions, thereby taking corresponding measures to ensure the safety of aircraft take-off and landing. The application of the water circulation mechanism 50 can effectively collect and reuse the discharged water, avoiding the waste of water resources and conforming to the concept of sustainable development. The grating water level gauge 30 can accurately detect the surface water layer thickness on the simulated runway, making the study of water layer thickness more accurate and reliable. The spray rainfall mechanism 60 realizes the simulation of rainfall weather, which helps to simulate the airport's weather environment in real time, and then conduct corresponding experiments and research. Through simulation experiments, it helps to improve the safety and reliability of airport construction and provides technical support for the safe operation of airport runways.

[0051] 2. The grating water level gauge 30 can monitor the thickness of the runway water film in real time, helping operators understand the distribution and trend of water. After the water flows through the runway specimen 22, it will be collected in the measuring cylinder 12. The water will be reintroduced into the reservoir simulation tank 51 through the valve at the bottom of the measuring cylinder 12 for recycling, realizing the recycling of water resources. The inclination of the runway specimen 22 can be adjusted by adjusting the height of the runway support column 21, realizing the adjustment of the simulated airport slope, thereby making fine adjustments to the simulated environment. The water pump 53 and the fan 43 can simultaneously simulate rainfall and wind, meeting the simulation needs of diverse airport runway environments.

[0052] 3. The adjustable slope structure 70 allows for convenient adjustment of experimental parameters, improving operational flexibility and efficiency. The fan 43 dries the water on the track specimen 22, preventing moisture from affecting subsequent experimental results. The adjusting motor 721, through the rotation of the adjusting screw 723 and the movement of the adjusting block 724, drives the adjusting telescopic rod 725 to rotate. When the tension of the telescopic spring 729 is fully released, the slope connecting plate 74 quickly rotates, causing the track specimen 22 to rotate upwards, achieving rapid adjustment and stopping. The track specimen 22, due to inertia, flings water upwards, increasing the drying area and improving the drying effect of the fan 43, accelerating the evaporation and drying process, and increasing experimental efficiency. The design of the positioning protrusion 755 and the positioning hemisphere 757 ensures accurate positioning of the slope connecting plate 74.

[0053] 4. By guiding the airflow of the fan 43 downwards towards the runway specimen 22, more airflow can reach the upper surface of the runway specimen 22, removing more moisture from the specimen and thus improving the drying efficiency. This allows for rapid drying of the specimen 22, preventing excess moisture from affecting subsequent experiments and improving overall experimental efficiency.

[0054] All possible combinations of the various technical features in the above embodiments are described; however, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make numerous modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A device for monitoring the thickness of water film on airport runways, characterized in that, The system includes a support mechanism (10), a runway simulation mechanism (20), several grating water level gauges (30), a wind simulation mechanism (40), a water circulation mechanism (50), and a sprinkler rain mechanism (60). The support mechanism (10) includes a support component (11) and a measuring cylinder (12). The support component (11) is fixedly installed on the ground, and the measuring cylinder (12) is installed at one end of the support component (11). The runway simulation mechanism (20) is fixedly installed on the top of the support component (11). The structure (20) is used to simulate an airport runway. Several grating water level gauges (30) are installed on the top of the runway simulation structure (20). The grating water level gauges (30) are used to monitor the water level changes inside the runway simulation structure (20). The wind simulation structure (40) is fixedly installed at the end of the runway simulation structure (20) away from the measuring cylinder (12). The wind simulation structure (40) is used to simulate the wind on the airport runway. One end of the water circulation mechanism (50) is connected to the top of the runway simulation structure (20). Spraying and lowering The rain mechanism (60) is fixedly installed on the top of the runway simulation mechanism (20). The spray rain mechanism (60) is used to simulate rainfall on the airport runway. The runway simulation mechanism (20) includes three runway support columns (21), an adjustable slope structure (70), a runway test piece (22), a wind shield (23), and a diverter plate (24). The three runway support columns (21) are installed at equal intervals on the top of the fixed support plate (112). The adjustable slope structure (70) is fixedly installed on the three runway support columns. (21) The runway specimen (22) is fixedly installed on the top of the adjustable slope structure (70). The runway specimen (22) is used to simulate an airport runway. The wind shield (23) is fixedly installed on the two side walls of the adjustable slope structure (70). A simulated gap (231) is formed between the wind shield (23) and the runway specimen (22). The diverter plate (24) is fixedly installed on one end of the runway specimen (22) near the measuring cylinder (12), and the diverter plate (24) is located on the top of the measuring cylinder (12).The adjustable slope structure (70) includes a slope support base plate (71), an adjustment drive assembly (72), two adjustment support arms (73), a slope connecting plate (74), two positioning assemblies (75), and a wind-guiding assembly (76). The slope support base plate (71) is fixedly installed on the top of the three runway support columns (21). The adjustment drive assembly (72) is fixedly installed on the top of the slope support base plate (71) near the wind turbine (43). The two adjustment support arms (73) are fixedly installed on both sides of the top of the slope support base plate (71). The slope connecting plate (74) is installed on the top of the adjustment drive assembly (72), and the end of the slope connecting plate (74) away from the wind turbine (43) is rotatably installed on the two... On each of the adjustable support arms (73), the runway specimen (22) is fixedly installed on the top of the slope connecting plate (74). Both the runway specimen (22) and the slope connecting plate (74) are slidably mounted on the side walls of the two adjustable support arms (73) facing each other. Two positioning components (75) are respectively installed inside the two adjustable support arms (73), and the top of the positioning components (75) extends upward through the top of the adjustable support arm (73). The two positioning components (75) are symmetrically arranged. The two ends of the wind guiding component (76) are respectively rotatably mounted on the top of the inner side walls of the wind shield (23) facing each other. The inner side walls of the wind shield (23) are respectively fixedly mounted on the side walls of the two adjustable support arms (73).

2. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The support assembly (11) includes four fixed support legs (111), a fixed support plate (112), and a mounting connection plate (113). The four fixed support legs (111) are all fixedly installed on the ground. The four corners of the fixed support plate (112) are respectively fixedly installed on the top of the four fixed support legs (111). The mounting connection plate (113) is fixedly installed on one end of the fixed support plate (112). The mounting connection plate (113) is connected to the measuring cylinder (12).

3. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The wind simulation mechanism (40) includes a rectifier net (41), a wind power mounting block (42), and a fan (43). The rectifier net (41) is fixedly installed on the end of the wind shield (23) away from the splitter plate (24). The rectifier net (41) is used to guide the flow of gas. The wind power mounting block (42) is fixedly installed on the side wall of the rectifier net (41) away from the splitter plate (24). The fan (43) is fixedly installed inside the wind power mounting block (42).

4. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The water circulation mechanism (50) includes a reservoir simulation box (51), a water supply pipe (52), a water pump (53), and a flow meter (54). The reservoir simulation box (51) is located below the measuring cylinder (12). One end of the water supply pipe (52) is connected to the inside of the reservoir simulation box (51), and the other end is connected to the top of the wind shield (23). The water pump (53) is installed in the middle of the water supply pipe (52), and the flow meter (54) is installed in the middle of the water supply pipe (52), and the flow meter (54) is located on the side of the water pump (53) away from the reservoir simulation box (51).

5. The airport runway water film thickness monitoring device according to claim 4, characterized in that, The wind shield (23) has a spray chamber (232) inside. One end of the water supply pipe (52) passes through the top of the wind shield (23) and is connected to the spray chamber (232). The spray rain mechanism (60) includes several nozzles (61). Several nozzles (61) are installed at equal intervals on the top of the simulated gap (231), and the top of the nozzles (61) is connected to the spray chamber (232).

6. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The adjustment drive assembly (72) includes an adjustment motor (721), two adjustment support seats (722), an adjustment screw (723), an adjustment moving block (724), two adjustment telescopic rods (725), and an adjustment mounting block (726). The adjustment motor (721) is fixedly installed on the top of the slope support base plate (71) near the fan (43). The two adjustment support seats (722) are fixedly installed on the top of the slope support base plate (71), and the two adjustment support seats (722) are... The adjustment screw (723) is rotatably mounted at both ends on the middle part of the adjustment screw (723), and the output shaft of the adjustment motor (721) is fixedly connected to one end of the adjustment screw (723). The adjustment moving block (724) is threaded onto the adjustment screw (723) and is slidably mounted on the top of the slope support base plate (71). The bottoms of the two adjustment telescopic rods (725) are rotatably mounted on the front and rear ends of the adjustment moving block (724). On both side walls, the front and rear side walls of the adjusting mounting block (726) are rotatably mounted on the top of two adjusting telescopic rods (725), and the top of the adjusting mounting block (726) is fixedly connected to the bottom of the slope connecting plate (74). The adjusting telescopic rod (725) includes an inner telescopic rod (727), an outer telescopic rod (728), and a telescopic spring (729). One end of the inner telescopic rod (727) is rotatably mounted on the side wall of the adjusting moving block (724), and the outer telescopic rod (728) is... One end of the telescopic rod (728) is rotatably mounted on the side wall of the adjusting mounting block (726). The end of the telescopic outer rod (728) away from the slope connecting plate (74) is provided with a telescopic groove (720). The telescopic spring (729) is fixedly installed in the inner end of the telescopic groove (720). The end of the telescopic inner rod (727) away from the adjusting motor (721) passes through the telescopic groove (720) and is fixedly connected to the telescopic spring (729). The telescopic inner rod (727) slides in cooperation with the side wall of the telescopic groove (720).

7. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The top of the adjusting support arm (73) is provided with a rotating groove (731), and the inside of the adjusting support arm (73) is provided with a toggle groove (732), and the inner side of the toggle groove (732) is connected to the rotating groove (731). Several positioning slots (733) are provided on the side walls of the two adjusting support arms (73) facing each other, and the several positioning slots (733) are spaced apart in the vertical direction. Several positioning slides (734) are also provided inside the adjusting support arm (73), and one side of the several positioning slides (734) is connected to the several positioning slots (733). 3) Connected: The other side of each of the several positioning grooves (734) is connected to the actuating circular groove (732). The positioning assembly (75) includes a linkage rotating rod (751), a linkage bevel gear (752), an actuating rod (753), several positioning springs (754), several positioning protrusions (755), and several sliding blocks (756). The linkage rotating rod (751) is rotatably mounted in the rotating groove (731) via a torsion spring. The linkage bevel gear (752) is fixedly mounted on the top of the linkage rotating rod (751), and the actuating rod (753) is fixedly mounted on the linkage rotating rod (751). The bottom of the side wall of the positioning slot (732) is provided with a lever (753) located in the actuating groove (732). Several positioning springs (754) are fixedly installed on the inner ends of several positioning slots (733). Several positioning protrusions (755) are fixedly installed on several positioning springs (754). The positioning protrusions (755) are slidably disposed on the side wall of the positioning slot (733). Several sliding blocks (756) are inserted into the side wall of several positioning protrusions (755). The sliding blocks (756) are slidably disposed on several positioning grooves (734). Inside, several sliding blocks (756) abut against one side wall of the lever (753). The end of the positioning protrusion (755) away from the positioning spring (754) forms a positioning hemisphere (757). The positioning hemisphere (757) is located outside the positioning slot (733). The slope connecting plate (74) has positioning strip grooves (741) on both sides of the side wall facing the two adjusting support arms (73). One of the positioning hemispheres (757) of several positioning protrusions (755) on the same side can be inserted into the corresponding positioning strip groove (741) for positioning.

8. The airport runway water film thickness monitoring device according to claim 1, characterized in that, The wind guiding assembly (76) includes a guiding shaft (761), two passive bevel gears (762) and a wind guiding plate (763). The two ends of the guiding shaft (761) are rotatably mounted on the top of the inner sidewalls of the windshield (23) facing each other. The two passive bevel gears (762) are fixedly mounted on the two ends of the guiding shaft (761) and are symmetrically arranged. The two passive bevel gears (762) mesh with the two linkage bevel gears (752) respectively. The wind guiding plate (763) is fixedly mounted on the middle of the sidewall of the guiding shaft (761).

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