Snowfall device for wind tunnel test

Abstract

The invention relates to the technical field of constructional engineering, and discloses a snowfall device for a wind tunnel test, which comprises a support frame and a lifting frame, the lifting frame is arranged on the support frame in a sliding fit manner along the height direction of the support frame, and the lifting frame is movably connected with a vertically through snow storage box; a first partition net is fixedly connected to the inner side wall of the snow storage box, an opening and closing mechanism is arranged at a bottom opening of the snow storage box, a first driving mechanism used for driving the snow storage box to shake is further arranged on the lifting frame, a perforated plate is detachably connected to the lifting frame, and a second driving mechanism used for driving the perforated plate to vibrate is further arranged on the lifting frame. A translation mechanism is further arranged on the lifting frame, an image acquisition device is arranged on the translation mechanism in a sliding fit mode, and the image acquisition device can move to any point in the plane range of the translation mechanism; the mounting plate is arranged below the lifting frame, the mounting plate is detachably connected with a test plate with geomorphic characteristics, and continuous and high-efficiency snowfall simulation experiments can be carried out.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, in particular to a snowfall device for wind tunnel testing. Background Art

[0002] Snowfall is a common natural phenomenon. When the snowfall is too heavy, it will bring about snow disasters and cause many inconveniences to humans, and even endanger the safety of life and property. Natural snowfall is often accompanied by the action of wind. The combined action of wind and snow will cause a lot of economic losses and even threaten life safety. In recent years, the field of civil engineering has set off a wave of research on wind and snow movement. Snowfall is an important part of the wind tunnel experiment process of wind and snow movement.

[0003] The snowfall device previously used for wind tunnel tests usually placed artificially prepared snow in a snowfall barrel at a test room temperature of -20°C. The scraper slowly rotated, sweeping the snow out through the small holes of the porous plate and causing it to fall naturally, thus forming a snowfall effect. However, during the simulation process, the snow in the snowfall barrel and the snow passing through the porous plate were very likely to become clogged, resulting in reduced efficiency of the snowfall barrel and the porous plate, thus affecting the results of wind tunnel experiments on wind and snow sports. Summary of the invention

[0004] The object of the present invention is to provide a snowfall device for wind tunnel testing, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a snowfall device for wind tunnel testing, comprising: Support frame; A lifting frame is slidably fitted on the support frame along the height direction of the support frame, a snow storage box which is passed through from top to bottom is movably connected to the lifting frame, a first partition net is fixedly connected to the inner side wall of the snow storage box, an opening and closing mechanism is arranged at the bottom of the snow storage box, a first driving mechanism for driving the snow storage box to shake is also arranged on the lifting frame, a porous plate is detachably connected to the lifting frame, a second driving mechanism for driving the porous plate to vibrate is also arranged on the lifting frame, a translation mechanism is also arranged on the lifting frame, an image acquisition device is slidably fitted on the translation mechanism, and the image acquisition device can be moved to any point within the plane range of the translation mechanism; The mounting plate is arranged below the lifting frame, and a test plate with landform features is detachably connected to the mounting plate.

[0006] Optionally, the first driving mechanism includes a first motor, a cam and a guide frame, the first motor is fixedly mounted on the lifting frame, the output end of the first motor is drivingly connected to the cam, the guide frame is fixedly connected to the snow storage box, the cam is arranged in the guide frame and abuts against the inner wall of the guide frame, and a plurality of first guide rods are fixedly connected at both ends of the snow storage box, the first guide rods are slidably connected to the lifting frame, and a first spring is fixedly connected between the first guide rod and the lifting frame.

[0007] Optionally, the second driving mechanism includes a pair of first connecting plates, which are detachably connected to both ends of the porous plate respectively, a first vibration device is fixedly mounted on the first connecting plates, and a second guide rod is fixedly connected to the first connecting plates, the second guide rod is slidably connected to the lifting frame, and a second spring is fixedly connected between the second guide rod and the lifting frame.

[0008] Optionally, the opening and closing mechanism includes a plurality of opening and closing plates and a third motor, the plurality of opening and closing plates are arranged side by side at the bottom of the snow storage box, the opening and closing plates are rotatably connected to the snow storage box via a first shaft rod, one end of the first shaft rod extends out of the snow storage box and is fixedly connected to a worm gear, the third motor is fixedly mounted on the snow storage box, the output shaft of the third motor is transmission-connected to a transmission rod, a plurality of coaxial worm gears are arranged on the transmission rod, and the plurality of worm gears correspond one-to-one and mesh with the plurality of worm gears.

[0009] Optionally, the translation mechanism includes a pair of first electric slide rails and a second electric slide rail, the pair of first electric slide rails are fixedly mounted on the lifting frame, the second electric slide rails are slidably connected to the slider ends of the pair of first electric slide rails, the second electric slide rails are perpendicular to the first electric slide rails, and the image acquisition device is provided on the slider end of the second electric slide rail.

[0010] Optionally, a pair of fourth motors are fixedly mounted on the support frame, and the output ends of the fourth motors are transmission-connected to a screw assembly, and the pair of screw assemblies are respectively transmission-coordinated with two ends of the lifting frame.

[0011] Optionally, the support frame is fixedly connected to a funnel-shaped collecting frame, the collecting frame is located below the mounting plate, the planar dimensions of the collecting frame are larger than the planar dimensions of a plurality of the mounting plates, a second vibration device is provided on the collecting frame, the bottom opening of the collecting frame is connected to an inclined collecting box, the bottom end of the collecting box is connected to a plurality of transmission pipes, the end of the transmission pipe away from the collecting box is connected to an inlet of a negative pressure device, the outlet of the negative pressure device is connected to a discharge pipe, the end of the discharge pipe away from the negative pressure device is connected to a bellows, the bellows extends into the snow storage box and is connected to the lifting frame.

[0012] Optionally, a plurality of through holes are opened at one end of the collection frame, a second partition net is arranged in the through holes, and the through holes face the bottom end of the concentration box.

[0013] Optionally, a pair of fourth electric rails are fixedly mounted on the support frame, a slider end of the fourth electric rail is fixedly connected to the third electric rail, the fourth electric rail is perpendicular to the third electric rail, the slider end of the third electric rail is fixedly connected to a second connecting plate, a second shaft rod is rotatably connected between the pair of second connecting plates, one end of the second shaft rod is transmission-connected to a fifth motor, the fifth motor is fixedly mounted on any of the second connecting plates, and a third vibration device and a plurality of mounting holes are provided on the mounting plate.

[0014] Optionally, a plurality of universal wheels with self-locking devices are connected to the bottom end of the support frame.

[0015] The present invention discloses the following technical effects: by adjusting the height position of the lifting frame on the supporting frame, it has extremely high adaptability to meet the needs of simulations at different heights; by putting snow into the snow storage box, the snow is first pre-supported by the first partition net, and the opening and closing mechanism is opened, and at the same time the first driving mechanism drives the snow storage box to shake, so that the snow on the first partition net is evenly spread and can gradually pass through the first partition net and be discharged from the snow storage box to the porous plate; at the same time, the second driving mechanism drives the porous plate to vibrate, vibrates the snow accumulated on the porous plate, so that the porous plate evenly sprinkles the snow downward, and can also prevent the porous plate from accumulating too much snow, so that a continuous and efficient snowfall simulation experiment can be carried out; after the experiment is completed, the image acquisition device is driven by the translation mechanism to scan the snowfall distribution state on the test plate, so as to meet the full-dimensional data collection after the experiment is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A bottom view of the lifting frame of the present invention; Figure 3 for Figure 2 A partial enlarged view of middle A; Figure 4 A cross-sectional view of a snow storage box of the present invention; Figure 5 for Figure 4 A partial enlarged view of B in the middle; Figure 6 A bottom view of the mounting plate of the present invention; Figure 7 It is a cross-sectional view of the collection frame of the present invention; Figure 8 for Figure 7 A partial enlarged view of C in the middle.

[0017] In the figure: 1, support frame; 2, lifting frame; 3, snow storage box; 4, first partition net; 5, opening and closing mechanism; 51, opening and closing plate; 52, third motor; 53, first shaft rod; 54, worm gear; 55, transmission rod; 56, worm; 6, first driving mechanism; 61, first motor; 62, cam; 63, guide frame; 64, first guide rod; 65, first spring; 7, perforated plate; 8, second driving mechanism; 81, first connecting plate; 82, first vibration device; 83, second guide rod; 84, second spring; 9, translation mechanism; 91, The first electric slide rail; 92, the second electric slide rail; 10, the image acquisition device; 11, the mounting plate; 13, the fourth motor; 14, the screw assembly; 15, the collection frame; 16, the second vibration device; 17, the concentration box; 18, the transmission pipeline; 19, the negative pressure device; 20, the discharge pipeline; 21, the bellows; 22, the through hole; 23, the second partition net; 24, the third electric slide rail; 25, the second connecting plate; 26, the second shaft; 27, the fifth motor; 28, the third vibration device; 29, the mounting hole; 30, the universal wheel; 31, the fourth electric slide rail. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figure 1-Figure 8 The present invention provides a snowfall device for wind tunnel testing, comprising: Support frame 1; A lifting frame 2 is slidably fitted on the support frame 1 in the height direction of the support frame 1, and a snow storage box 3 that passes through the upper and lower parts is movably connected to the lifting frame 2. A first partition net 4 is fixedly connected to the inner side wall of the snow storage box 3, and an opening and closing mechanism 5 is arranged at the bottom of the snow storage box 3. The lifting frame 2 is also provided with a first driving mechanism 6 for driving the snow storage box 3 to shake, and a porous plate 7 is detachably connected to the lifting frame 2. The lifting frame 2 is also provided with a second driving mechanism 8 for driving the porous plate 7 to vibrate. The lifting frame 2 is also provided with a translation mechanism 9, and an image acquisition device 10 is slidably fitted on the translation mechanism 9, and the image acquisition device 10 can be moved to any point within the plane range of the translation mechanism 9; The mounting plate 11 is arranged below the lifting frame 2 , and a test plate with landform features is detachably connected to the mounting plate 11 .

[0021] By adjusting the height position of the lifting frame 2 on the support frame 1, it has extremely high adaptability to meet the needs of simulation at different heights. By putting snow into the snow storage box 3, the snow is first pre-supported by the first partition net 4, and the opening and closing mechanism is opened. At the same time, the first driving mechanism 6 drives the snow storage box 3 to shake, so that the snow on the first partition net 4 is evenly spread and can gradually pass through the first partition net 4 and be discharged from the snow storage box 3 to the porous plate 7. At the same time, the second driving mechanism 8 drives the porous plate 7 to vibrate, vibrating the snow on the porous plate 7, so that the porous plate 7 evenly sprinkles the snow downward, and can also prevent the porous plate 7 from accumulating too much snow, so that a continuous and efficient snowfall simulation experiment can be carried out. After the experiment is completed, the image acquisition device 10 is driven by the translation mechanism 9 to scan the snowfall distribution state on the test plate, so as to meet the full-dimensional data acquisition after the completion of the experiment.

[0022] A further optimized solution is that the first driving mechanism 6 includes a first motor 61, a cam 62 and a guide frame 63. The first motor 61 is fixedly mounted on the lifting frame 2. The output end of the first motor 61 is transmission-connected to the cam 62. The guide frame 63 is fixedly connected to the snow storage box 3. The cam 62 is arranged in the guide frame 63 and abuts against the inner wall of the guide frame 63. A plurality of first guide rods 64 are respectively fixedly connected at both ends of the snow storage box 3. The first guide rods 64 are slidingly connected to the lifting frame 2. A first spring 65 is fixedly connected between the first guide rod 64 and the lifting frame 2.

[0023] The cam 62 is driven to rotate by the first motor 61, so that the cam 62 pushes the guide frame 63 back and forth. Due to the cooperation of multiple first guide rods 64 and the first spring 65, the snow storage box 3 can rock back and forth, thereby achieving the effect of evenly spreading the snow on the first partition net 4 while gradually passing through the first partition net 4 and being discharged from the snow storage box 3 to the porous plate 7.

[0024] A further optimized solution is that the second driving mechanism 8 includes a pair of first connecting plates 81, and the pair of first connecting plates 81 are detachably connected to the two ends of the porous plate 7 respectively (preferably bolted), and a first vibrating device 82 is fixedly mounted on the first connecting plates 81, and a second guide rod 83 is fixedly connected to the first connecting plates 81, the second guide rod 83 is slidably connected to the lifting frame 2, and a second spring 84 is fixedly connected between the second guide rod 83 and the lifting frame 2.

[0025] The second guide rod 83 and the second spring 84 guide and support the first connecting plate 81, so that when the first vibration device 82 vibrates, the porous plate 7 vibrates, thereby preventing a lot of snow from accumulating on the porous plate.

[0026] Further, the porous plate 7 is box-shaped, so as to prevent snow thereon from falling off the porous plate 7 during vibration.

[0027] Furthermore, the snowfall flow rate can be adjusted by replacing the porous plates 7 with different apertures.

[0028] A further optimized solution is that the opening and closing mechanism 5 includes a plurality of opening and closing plates 51 and a third motor 52. The plurality of opening and closing plates 51 are arranged side by side at the bottom of the snow storage box 3. The opening and closing plates 51 are rotatably connected to the snow storage box 3 through a first shaft rod 53. One end of the first shaft rod 53 extends out of the snow storage box 3 and is fixedly connected to a worm gear 54. The third motor 52 is fixedly installed on the snow storage box 3. The output shaft of the third motor 52 is transmission-connected to a transmission rod 55. A plurality of coaxial worms 56 are arranged on the transmission rod 55. The plurality of worms 56 correspond one-to-one to and mesh with the plurality of worm gears 54.

[0029] The transmission rod 55 is driven to rotate by the third motor 52, so that the multiple worms 56 on the transmission rod 55 drive the multiple worm wheels 54 to rotate synchronously, so that the first shaft rod 53 drives the opening and closing plate 51 to flip, thereby realizing the opening and closing of the bottom of the snow storage box 3.

[0030] A further optimized solution is that the translation mechanism 9 includes a pair of first electric slide rails 91 and a second electric slide rail 92. The pair of first electric slide rails 91 are fixedly mounted on the lifting frame 2. The second electric slide rails 92 are slidably connected to the slider ends of the pair of first electric slide rails 91. The second electric slide rails 92 are perpendicular to the first electric slide rails 91. An image acquisition device 10 is provided on the slider end of the second electric slide rail 92.

[0031] The second electric slide rail 92 slides along the first electric slide rail 91 and the second electric slide rail 92 drives the image acquisition device 10 to slide, so that the image acquisition device 10 can be adjusted to move to any point within the plane range of the translation mechanism 9, so that the image acquisition device 10 can perform an all-round scan of the test plate.

[0032] According to a further optimized solution, a pair of fourth motors 13 are fixedly mounted on the support frame 1 , and the output ends of the fourth motors 13 are transmission-connected to a screw assembly 14 , and the pair of screw assemblies 14 are transmission-coordinated with the two ends of the lifting frame 2 .

[0033] The fourth motor 13 drives the screw assembly 14 to realize the lifting of the lifting frame 2 . Providing a pair of screw assemblies 14 can improve the sliding stability of the lifting frame 2 .

[0034] A further optimized solution is that the support frame 1 is fixedly connected with a funnel-shaped collecting frame 15, the collecting frame 15 is located below the mounting plate 11, the plane size of the collecting frame 15 is larger than the plane sizes of multiple mounting plates 11, and a second vibrating device 16 is arranged on the collecting frame 15, the bottom of the collecting frame 15 is connected with an inclined collecting box 17, the bottom end of the collecting box 17 is connected with multiple transmission pipes 18, the end of the transmission pipe 18 away from the collecting box 17 is connected with the inlet of the negative pressure device 19, the outlet of the negative pressure device 19 is connected with a discharge pipe 20, the end of the discharge pipe 20 away from the negative pressure device 19 is connected with a bellows telescopic tube 21, the bellows telescopic tube 21 extends into the snow storage box 3 and is connected with the lifting frame 2.

[0035] The snow that has not fallen onto the mounting plate during the snowfall simulation is collected by a funnel-shaped collecting frame 15, and the second vibrating device 16 produces a vibration effect, so that the snow is concentrated into the collecting box 17, and then the negative pressure device 19 transmits the snow in the collecting box 17 to the discharge pipe 20 through the transmission pipe 18 by negative pressure, and the bellows 21 discharges the snow into the snow storage box 3, thereby realizing automatic recycling of snow. At the same time, by setting the bellows 21, the position state between the port of the bellows 21 and the snow storage box 3 can be maintained.

[0036] As a further optimization scheme, a plurality of through holes 22 are opened at one end of the collecting frame 15 , a second partition net 23 is arranged in the through holes 22 , and the through holes 22 face the bottom end of the collecting box 17 .

[0037] By setting the through hole 22, the wind generated in the wind tunnel can be utilized, introduced through the through hole 22 and blown toward the bottom end of the collecting box 17. When the snow is blown toward the transmission pipe 18 at the bottom end of the collecting box 17, the snow is sucked into the transmission pipe 18, thereby improving the recycling efficiency of the snow.

[0038] A further optimized solution is that a pair of fourth electric slide rails 31 are fixedly installed on the support frame 1, the slider end of the fourth electric slide rail 31 is fixedly connected to the third electric slide rail 24, the fourth electric slide rail 31 is perpendicular to the third electric slide rail, the slider end of the third electric slide rail 24 is fixedly connected to the second connecting plate 25, a second shaft rod 26 is rotatably connected between the pair of second connecting plates 25, one end of the second shaft rod 26 is transmission-connected to the fifth motor 27, the fifth motor 27 is fixedly installed on any second connecting plate 25, and a third vibration device 28 and a plurality of mounting holes 29 are provided on the mounting plate 11.

[0039] The third electric slide rail 24 is driven to slide by the fourth electric slide rail 31, and the third electric slide rail 24 drives the second connecting plate 25 to slide, and cooperates with the fifth motor 27 to drive the second shaft rod 26 to rotate, so that the mounting plate 11 is flipped, so that the mounting plate 11 can maintain a multi-angle state and position switching, so as to adapt to the test plates of different sizes and landforms installed on the mounting plate 11 and the needs of experiments at different angles, and after the snowfall simulation is over, the second shaft rod 26 can be driven to rotate by the fifth motor 27 to flip the mounting plate 11 to a suitable angle, and cooperate with the third vibration device 28 to make the mounting plate 11 vibrate, so as to effectively dump the accumulated snow on the test plate into the collection frame 15, saving a lot of manpower and material resources.

[0040] According to a further optimized solution, a plurality of universal wheels 30 with self-locking devices are connected to the bottom end of the support frame 1 .

[0041] Furthermore, the present invention also includes a processor and a control device. The processor can perform calculations and processing based on the characteristic data during the simulated snowfall test, and intelligently analyze whether parameters such as snowfall flow, wind force, and wind direction angle meet the working condition requirements of the current test. The analysis results transmit corresponding instructions to the control device. The central processing unit is connected to the control device via a bus or other means. The control device is connected to the third motor 52, the first motor 61, the first vibration device 82, the first electric slide rail 91, the second electric slide rail 92, the image acquisition device 10, the fourth motor 13, the second vibration device 16, the negative pressure device 19, the third electric slide rail 24, the fifth motor 27, and the third vibration device 28 to achieve fully intelligent remote operation and automatically adjust the start and end of the required simulated snowfall state according to the test or on-site requirements.

[0042] Furthermore, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0043] Furthermore, the test plate is connected to the mounting plate 11 by means of bolts.

[0044] Experimental steps: First, the image acquisition device 10 can perform a full-scale scanning process on the test board that needs data capture through instructions issued by the processor before the test; secondly, after the snowfall simulation test is completed, the surface morphology characteristics of the test board are collected according to the corresponding instructions, and the data obtained before and after the test are compared and processed for intelligent analysis.

[0045] The data acquisition process of the image acquisition device 10 will be fed back to the processor in real time. The processor can perform intelligent analysis based on the information data captured by the image acquisition device 10 in real time, and control the first electric slide rail 91 and the second electric slide rail 92 to move the image acquisition device 10 to realize the horizontal and vertical movement of the laser acquisition instrument, thereby ensuring 360-degree all-round information capture.

[0046] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A snowfall device for wind tunnel testing, characterized in that: include: Support frame (1); A lifting frame (2) is slidably engaged with the support frame (1) in the height direction of the support frame (1); a snow storage box (3) which is movably connected to the lifting frame (2) and is connected vertically; a first partition net (4) is fixedly connected to the inner side wall of the snow storage box (3); an opening and closing mechanism (5) is arranged at the bottom of the snow storage box (3); a first driving mechanism (6) for driving the snow storage box (3) to shake is also arranged on the lifting frame (2); a porous plate (7) is detachably connected to the lifting frame (2); a second driving mechanism (8) for driving the porous plate (7) to vibrate is also arranged on the lifting frame (2); a translation mechanism (9) is slidably engaged with an image acquisition device (10) on the translation mechanism (9); the image acquisition device (10) can be moved to any point within the plane range of the translation mechanism (9); A mounting plate (11) is arranged below the lifting frame (2), and a test plate with landform features is detachably connected to the mounting plate (11).

2. A snowfall device for wind tunnel testing according to claim 1, characterized in that: The first driving mechanism (6) comprises a first motor (61), a cam (62) and a guide frame (63); the first motor (61) is fixedly mounted on the lifting frame (2); the output end of the first motor (61) is transmission-connected to the cam (62); the guide frame (63) is fixedly connected to the snow storage box (3); the cam (62) is arranged in the guide frame (63) and abuts against the inner wall of the guide frame (63); and a plurality of first guide rods (64) are fixedly connected to both ends of the snow storage box (3); the first guide rods (64) are slidably connected to the lifting frame (2); and a first spring (65) is fixedly connected between the first guide rods (64) and the lifting frame (2).

3. The snowfall device for wind tunnel testing according to claim 1, characterized in that: The second driving mechanism (8) comprises a pair of first connecting plates (81), the pair of first connecting plates (81) being detachably connected to two ends of the perforated plate (7), a first vibrating device (82) being fixedly mounted on the first connecting plates (81), and a second guide rod (83) being fixedly connected to the first connecting plates (81), the second guide rod (83) being slidably connected to the lifting frame (2), and a second spring (84) being fixedly connected between the second guide rod (83) and the lifting frame (2).

4. The snowfall device for wind tunnel testing according to claim 1, characterized in that: The opening and closing mechanism (5) comprises a plurality of opening and closing plates (51) and a third motor (52). The plurality of opening and closing plates (51) are arranged side by side at the bottom of the snow storage box (3). The opening and closing plates (51) are rotatably connected to the snow storage box (3) via a first shaft (53). One end of the first shaft (53) extends out of the snow storage box (3) and is fixedly connected to a worm gear (54). The third motor (52) is fixedly mounted on the snow storage box (3). The output shaft of the third motor (52) is transmission-connected to a transmission rod (55). The transmission rod (55) is provided with a plurality of coaxial worm gears (56). The plurality of worm gears (56) correspond to and mesh with the plurality of worm gears (54) one by one.

5. The snowfall device for wind tunnel test according to claim 1, characterized in that: The translation mechanism (9) comprises a pair of first electric slide rails (91) and a second electric slide rail (92); the pair of first electric slide rails (91) are fixedly mounted on the lifting frame (2); the second electric slide rails (92) are slidably connected to the slider ends of the pair of first electric slide rails (91); the second electric slide rails (92) are perpendicular to the first electric slide rails (91); and the image acquisition device (10) is arranged on the slider end of the second electric slide rail (92).

6. The snow-reducing device for wind tunnel testing according to claim 1, characterized in that: A pair of fourth motors (13) are fixedly mounted on the support frame (1), and the output ends of the fourth motors (13) are transmission-connected to a screw assembly (14), and the pair of screw assemblies (14) are respectively transmission-matched with two ends of the lifting frame (2).

7. The snow-reducing device for wind tunnel testing according to claim 1, characterized in that: The support frame (1) is fixedly connected to a funnel-shaped collecting frame (15). The collecting frame (15) is located below the mounting plate (11). The plane size of the collecting frame (15) is larger than the plane sizes of the plurality of mounting plates (11). A second vibrating device (16) is arranged on the collecting frame (15). The bottom opening of the collecting frame (15) is connected to an inclined centralizing box (17). The bottom end of the centralizing box (17) is connected to a plurality of transmission pipes (18). One end of the transmission pipe (18) away from the centralizing box (17) is connected to an inlet of a negative pressure device (19). The outlet of the negative pressure device (19) is connected to a discharge pipe (20). One end of the discharge pipe (20) away from the negative pressure device (19) is connected to a bellows telescopic pipe (21). The bellows telescopic pipe (21) extends into the snow storage box (3) and is connected to the lifting frame (2).

8. The snow-reducing device for wind tunnel testing according to claim 7, characterized in that: A plurality of through holes (22) are provided at one end of the collection frame (15), a second partition net (23) is arranged in the through holes (22), and the through holes (22) face the bottom end of the concentration box (17).

9. The snowfall device for wind tunnel test according to claim 1, characterized in that: A pair of fourth electric slide rails (31) are fixedly mounted on the support frame (1); a slider end of the fourth electric slide rail (31) is fixedly connected to a third electric slide rail (24); the fourth electric slide rail (31) is perpendicular to the third electric slide rail; a slider end of the third electric slide rail (24) is fixedly connected to a second connecting plate (25); a second shaft rod (26) is rotatably connected between the pair of second connecting plates (25); one end of the second shaft rod (26) is transmission-connected to a fifth motor (27); the fifth motor (27) is fixedly mounted on any of the second connecting plates (25); and a third vibration device (28) and a plurality of mounting holes (29) are provided on the mounting plate (11).

10. The snowfall device for wind tunnel test according to claim 1, characterized in that: The bottom end of the support frame (1) is connected to a plurality of universal wheels (30) with self-locking devices.

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