KR102451420B1 - Artificial snow snowfall method for testing - Google Patents

Abstract

The present invention relates to an apparatus, a system, and a method for dropping artificial snow for a test, capable of dropping artificial snow imitating natural snow for evaluating a performance change of a structure caused by drifted snow. In accordance with the present invention, the apparatus for dropping artificial snow for a test includes: a head unit having a mixing space formed therein; an air inlet connected to the head unit to cause compressed air to be supplied from the outside to the mixing space of the head unit; a water inlet connected to the head unit to cause water to be supplied from the outside to the mixing space of the head unit; a nozzle unit connected to the head unit to cause a mixture of the water and the air to be sprayed in an aerosol state when pressure in the mixing space reaches a threshold value; and a stand compressing a pillar and a support for supporting the head unit.

Description

Artificial snow snowfall method for testing

The present invention relates to an artificial snow snowing method for testing using an artificial snow snowfalling device configured to snow artificial snow simulating natural snow in order to evaluate the performance change of a structure due to snowfall.

Recently, as the demand for sustainable renewable energy increases, the cases of installing solar panels on the roofs, roofs, and houses of buildings are increasing.

However, the solar panel has disadvantages in that durability is lower than that of building structures such as concrete, and the efficiency of sunlight is lowered according to weather conditions.

When snow accumulates on the surface of the solar panel, it is difficult to reach the sunlight, and the power generation efficiency of the solar panel rapidly decreases due to the drop in temperature. In addition, when snow accumulates on the solar panel, the efficiency of the solar panel decreases until the snow naturally melts and disappears. .

As described above, in order to evaluate the effect of snowfall, such as the efficiency reduction value of the solar panel and the performance evaluation of the snow removal device, a snowfall device capable of simulating snowfall similar to the natural state is required.

Conventional snowfall equipment is to manufacture artificial snow by crushing ice, and there was a significant difference from natural snow.

Registered Patent 10-0890226 "Artificial snow manufacturing apparatus" relates to an apparatus for manufacturing artificial snow, and provides an apparatus for manufacturing artificial snow by crushing ice to make artificial snow, and spraying it with a blower.

As in the previous technology, when artificial snow is made by crushing a lump of ice, the ice is crushed and sprayed. When the artificial snow is loaded, the ice particles condense to form an ice layer or form ice on the surface of the structure and adhere to the natural snow. shows a very different state.

In general, the solar panel snow removal device is configured to remove the snow by scattering the snow using a blower in order to prevent damage to the panel surface. Snow in its natural state can be removed by the wind when a blower is used in the snow condition. However, in the case of artificial snow that is crushed and sprayed with ice, it solidifies and the snow removal efficiency of the snow removal device using a blower decreases, so the performance of the snow removal device is accurately evaluated. hard to do

Therefore, in the performance evaluation of the blower type snow removal equipment, a device capable of generating artificial snow with characteristics similar to natural snow is essential, and this is not limited to the evaluation of solar panel snow removal equipment. It can be widely used to evaluate the performance degradation of structures due to snow accumulation, such as agricultural structures such as greenhouses, plastic houses, etc.

1. Registered Patent 10-0074790 "Artificial snowfall device and snowfall method" 2. Registered Patent 10-0890226 "Artificial Eye Manufacturing Device" 3. Registered Patent 10-1479859 "Artificial Eye Manufacturing Apparatus" 4. Registered Utility Model 20-0474081 "Artificial Eye Manufacturing Apparatus"

An object of the present invention is to provide a snowfall apparatus, system, and method configured to snow artificial snow simulating natural snow in order to evaluate the performance of a snow removal apparatus installed in a structure such as a solar panel.

In order to solve the above problems, the present invention provides a "head part having a mixing space therein; an air inlet communicating with the head part and configured to supply compressed air from the outside to the mixing space of the head part; a water inlet communicating with the head part and configured to supply water to the mixing space of the head part from the outside; a nozzle part communicating with the head part and configured to spray water and air in an aerosol state when the pressure of the mixing space reaches a critical value; and a stand comprising a pillar and a pedestal for supporting the head unit. Provide a device for artificial snow snowfall for the test consisting of

In addition, tilting means for rotating the head up and down; and rotating means for rotating the head unit left and right; It may be configured to further include.

In addition, it is installed on the pillar of the stand, the lifting means for lifting the head up and down; and a wheel provided at the lower end of the pedestal of the stand to move the stand. It may be configured to further include.

In addition, the present invention is "climate environment chamber; a device for artificial snow snowfall for the test disposed in the climate chamber; a temperature/humidity control device for controlling the temperature and humidity inside the climate environment chamber; and a thermo-hygrometer installed to measure the temperature and humidity inside the climate environment chamber. Artificial snow snowfall system for testing constructed including

In addition, the present invention "using the artificial snow snowfall system for the test, (a) disposing the subject in the center of the climate environment chamber; (b) moving the artificial snow snowing device for the test to a position where snowfall operation can be performed on the test object; (c) controlling the temperature and humidity in the climate environment chamber with the temperature/humidity control device until they reach standard atmospheric conditions, then stopping the temperature/humidity control device and sealing the climate environment chamber; (d) controlling the temperature in the climate chamber with the temperature and humidity control device until it reaches -30°C; (e) injecting water and air into the water inlet and the air inlet of the head part, respectively, until the pressure inside the mixing space reaches 5.5 to 7 bar; (f) spraying snow for a set time on the test subject according to the snowfall condition with the artificial snow snowfalling device for the test; (g) stabilizing the climate inside the climate environment chamber after controlling the temperature and humidity in the climate environment chamber with the temperature and humidity control device until reaching standard atmospheric conditions; and (h) visually confirming whether the snowfall operation is uniformly completed on the test object; The artificial snow snowfall method for testing including

In this case, in step (f), the head unit can be moved up, down, left and right to spray snow so that the snow is uniformly applied to the test object.

By using the apparatus, system and method provided by the present invention, artificial snow simulated similar to natural snow can be snowed on the test structure, so that the snow removal performance of the snow removal device applied to the structure can be accurately evaluated, and the head of the snow removal device By rotating the part up, down, left and right, it can be evenly deposited on the test structure. In addition, by using the climate environment chamber, only the snow removal performance of the snow removal equipment can be clearly evaluated while excluding the influence of other weather requirements.

[FIG. 1] shows an embodiment of a device for artificial snow snowfall for the test provided by the present invention.
[Figure 2] is a perspective view of an embodiment of the apparatus for snow artificial snow for the test provided by the present invention.
[Fig. 3] is a schematic diagram of an artificial snow snowfall system for testing.
[Figure 4] is a snowfall scene of the artificial snow snowfalling device for the test of the present invention.

The present invention provides an apparatus (1), system and method for snow artificial snow for testing. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1. Apparatus for artificial snow snowfall for testing (1)

The present invention is "head portion 100 having a mixing space formed therein; an air inlet 120 communicating with the head part 100 and configured to supply compressed air to the mixing space of the head part 100 from the outside; a water inlet 110 communicating with the head part 100 and configured to supply water to the mixing space of the head part 100 from the outside; a nozzle unit 130 communicating with the head unit 100 and configured to spray water and air in an aerosol state when the pressure of the mixing space reaches a critical value; and a stand 200 comprising a pillar 210 and a pedestal 220 supporting the head unit 100 ; Provides an artificial snow snowing device (1) for the test comprising a.

The artificial snow snowing device 1 for the test is to reproduce a state in which natural snow is uniformly deposited on the upper surface of the subject V, such as a solar panel.

In this case, the test object (V) refers to all structures that require performance evaluation of the snow removal device, such as a solar panel, a plastic house, and a building structure.

[Figure 1] shows an embodiment of the apparatus 1 for artificial snow for the test provided by the present invention, and [Figure 2] is the apparatus 1 for the artificial snow for the test provided by the present invention. It is a perspective view of an embodiment, [Fig. 3] is a schematic diagram of an artificial snow snowfall system for testing, and [Figure 4] is a snowfall implementation scene of the artificial snow snowfall apparatus 1 for a test of the present invention.

The head part 100 is a sealed member in which a mixing space for mixing water and air is formed therein, as shown in FIG. 1 , and may be formed in various shapes, an air inlet 120 to be described later, water Since it is completely sealed except for the inlet 110 and the nozzle unit 130, it is preferable to be made of a material having excellent pressure resistance, airtightness, watertightness and corrosion resistance to respond to pressure and prevent rust and corrosion.

The head unit 100 may be manufactured in various sizes, and in one embodiment, when snow-loading a solar panel of 2,000 mm × 1,000 mm × 35 mm, the size of the head unit 100 is 130 to 150 mm × 170 It can be formed in ~190mm × 130~170mm.

The air inlet 120 may be configured to communicate with the head part 100 to supply compressed air from the outside to the mixing space of the head part 100 . The air inlet 120 may be provided with a mechanical or electromagnetic valve to adjust the air injection amount.

The water inlet 110 may be configured to communicate with the head part 100 to supply compressed water from the outside to the mixing space of the head part 100 . The water inlet 110 may be provided with a mechanical or electromagnetic valve to control the amount of water injected.

The air inlet 120 or the water inlet 110 may be connected to a compressor so that it can be injected at a constant pressure, and a control unit for controlling the valve and the compressor is further included to inject water or air compressed to a specific pressure. have.

An embodiment of the apparatus 1 for artificial snow snowfall for the test and the pipe connected to the air inlet 120 or the water inlet 110 are as shown in [Reference Fig. 1] below. Since compressed air or water is injected into the pipe, it is preferable to use a pipe made of a pressure-resistant material mixed with steel fibers or the like.

[Reference 1]

The nozzle unit 130 communicates with the head unit 100 so that when the pressure inside the head unit 100 reaches a critical value, water and air are mixed to the outside and sprayed in an aerosol state. The nozzle unit 130 may be composed of a single or a plurality of nozzles, and when the mixing space reaches a specific pressure, the aerosol may be sprayed to the outside of the head unit 100 .

In order to snowfall artificial snow satisfactory in the present invention, it is preferable that the nozzle unit 130 sprays in an aerosol state when the pressure threshold reaches 5.5 to 7 bar. To this end, an automatic valve may be installed in the nozzle unit 130 to be sprayed when a specific pressure is reached. The nozzle unit 130 is manufactured with an optimal nozzle diameter that is sprayed in an aerosol state when the internal pressure reaches 5.5-7 bar, or a pressure sensor is installed in the head part 100 so that the pressure of the mixing space is 5.5-7 bar. It can be configured to open when reached.

The artificial snow snowing device 1 for the test provided by the present invention must be able to reproduce artificial snow as similar as possible to natural snow, and accordingly, an air inlet 120 communicating with the mixing space inside the head 100; A water inlet 110 and a nozzle unit 130 are provided.

Water and air are introduced into the mixing space at a pressure of 5.5 to 7 bar, respectively, and are mixed in the mixing space and when the pressure inside the mixing space reaches 5.5 to 7 bar, water and air through the nozzle unit 130 It is sprayed in the form of fine droplets in a mixed aerosol state. It is sprayed in an aerosol state when it reaches 5.5 bar, and it can be sprayed while increasing the pressure up to 7 bar depending on the condition of the test site or the type of test. When the pressure exceeds 7 bar, as the spray pressure increases, vibration, movement, breakage, etc. of the device may occur and it may be difficult to obtain accurate test results, so it is preferable that the pressure be limited to a maximum of 7 bar.

The stand 200 may include a pillar 210 and a pedestal 220 supporting the head unit 100 . The pillar 210 may be coupled to the head part 100 , and the pedestal 220 may be coupled to a lower end of the pillar 210 .

In addition, the tilting means 300 for rotating the head part 100 up and down; and a rotating means 400 for rotating the head part 100 left and right; It may be configured to further include.

The tilting means 300 may be configured to rotate the head part 100 at a predetermined angle in the vertical direction. The tilting means 300 may adjust the angle mechanically or electronically.

The tilting means 300 may include a rotation support hinged to the head part 100 and a rotation shaft, and a tilting motor connected to the rotation shaft of the rotation support part. Preferably, the tilting motor uses a step motor capable of setting a tilting angle.

The rotating means 400 may be configured to rotate the head part 100 at a predetermined angle in the left and right directions. The rotation means 400 may adjust the angle mechanically or electronically.

The rotating means 400 may include a rotating unit coupled to the lower end of the head unit 100 and a rotating motor 410 connected to the rotating unit to rotate the head unit 100 in the left and right directions on a horizontal plane. . As shown in [Fig. 1], the rotation motor 410 used for left and right rotation is preferably a step motor capable of setting a rotation angle.

As in the embodiment shown in [Fig. 1], the head part 100 moves in an arc shape to the left and right about the hinge axis and tilts at a certain angle to uniformly spray microdroplets in a certain range.

Considering the size of a general solar panel, it is preferable that the tilting means 300 is tilted by 45 degrees up and down with respect to the horizontal line, and the rotating means 400 is rotated at an angle of 120 degrees left and right.

In addition, it is installed on the pillar 210 of the stand 200, the lifting means 500 for elevating the head part 100 up and down; and a wheel 600 provided at the lower end of the pedestal 220 of the stand 200 to move the stand 200 ; It may be configured to further include.

In this case, the lifting means 500 may have any one or more structures of a rail-type structure, a chain-type structure, a gear-type structure, a sliding structure, and a telescopic structure. The lifting means 500 may be operated mechanically or electronically.

The apparatus 1 for snowing artificial snow for the test of the present invention may be configured in various sizes and shapes depending on the scale of the subject V. The apparatus 1 for artificial snow snowfall for the test shown in [Fig. 1] to [Fig. 4] is one of the embodiments of the present invention, and the present invention is provided in various sizes and shapes within the scope of protection of the present invention. may be configured, and is not limited to the embodiment shown in [FIG. 1] to [FIG. 4].

The lifting means 500 of the artificial snow snowing device 1 for the test shown in Fig. 1 has a sliding structure, and is fixed by mounting the head 100 on the lifting jaws 510 protruding at regular intervals. This is an embodiment configured to do so.

The lifting means 500 of the artificial snow snowfalling device 1 for the test shown in FIG. 2 is an embodiment configured with a telescopic structure and may control the lifting means 500 mechanically or electronically.

As described above, the apparatus 1 for artificial snow snowfall for the test of the present invention is capable of rotating the head part 100 up, down, left and right through the tilting means 300 and the rotating means 400, and the lifting means 500 It is possible to move up and down through it, and it is possible to easily move horizontally through the wheel 600 that moves the stand 200 .

Therefore, the apparatus 1 for artificial snow snowfall for the test of the present invention can uniformly spray microdroplets irrespective of the size, shape, and height of the subject V.

2. Experimental artificial snow snow system

The artificial snow snowfall system for the test provided by the present invention sprays microdroplets in an aerosol state mixed with air to the outside of the head part 100 by using the artificial snow snowfalling device 1 for the above-described test, and the At the same time as spraying, it converts the microdroplets into artificial snow and snows to reproduce the snow condition on the subject.

In order to carry out the above-mentioned snowfall, the present invention provides a "climate environment chamber 10; The artificial snow snowfalling device (1) for the test disposed in the climate environment chamber (10); a temperature and humidity control device 11 for controlling the temperature and humidity inside the climate environment chamber 10; and a thermo-hygrometer 12 installed to measure the temperature and humidity inside the climate environment chamber 10; Artificial snow snowfall system for testing constructed including

The climatic environment chamber 10 must secure airtightness and watertightness in the internal space to block external influences and conduct experiments.

The climate environment chamber 10 may be formed in various shapes and sizes as shown in [Reference Fig. 2] below.

[Reference Figure 2]

The artificial snow snowfalling device 1 for the test is the same as described above, and since the temperature inside the climate environment chamber 10 drops to -30°C, a drainage facility (not shown) is installed and generated during the test. A device that can quickly drain the water to the outside and dry the inside may be additionally disposed.

The temperature and humidity control device 11 is a facility for controlling the temperature and humidity inside the climate environment chamber (10). The temperature inside the climate environment chamber can be controlled by means such as an electric heater, a boiler, a refrigerator, and the like, and the humidity can be controlled by means such as a humidifying facility and a dehumidifying facility. The temperature/humidity control device 11 may be implemented by a combination of the various facilities described above.

The thermo-hygrometer 12 is installed so as to measure the temperature and humidity for each height of the space above the subject V. Accordingly, by monitoring the temperature change state of the upper part of the test object V, it is possible to determine the time point at which a specific temperature is reached for each test step.

In the climate environment chamber 10, in addition to the above devices, a blower for controlling wind speed, a watering device for creating a rainfall environment, solar lighting for creating a solar environment, etc. can be installed to implement various climate environments.

3. Experimental artificial snow snowfall method

The present invention provides a method of snowing artificial snow for a test using the above-described artificial snow snowfalling system for testing.

That is, the present invention comprises the steps of "(a) arranging the subject (V) in the center of the climatic environment chamber 10; (b) moving the artificial snow snowing device (1) for the test to a position where a snowfall operation can be performed on the test subject (V); (c) controlling the temperature and humidity in the climate environment chamber 10 with the temperature and humidity control device 11 until they reach standard atmospheric conditions, then stop the temperature and humidity control device, and then stop the climate environment chamber ( 10) sealing; (d) controlling the temperature in the climate environment chamber 10 with the temperature and humidity control device 11 until it reaches -30°C; (e) injecting water and air into the water inlet 110 and the air inlet 120 of the head part 100, respectively, until the pressure inside the mixing space reaches 5.5-7 bar; (f) spraying snow for a set time on the test subject (V) according to the snowfall condition with the artificial snow snowfalling device (1) for the test; (g) stabilizing the climate inside the climate environment chamber 10 after controlling the temperature and humidity in the climate environment chamber 10 with the temperature and humidity control device 11 until they reach standard atmospheric conditions; and (h) visually confirming whether the snowfall operation is uniformly completed on the subject (V); A method for artificial snow snowfall for testing including

At this time, in step (f), the head part 100 may be moved up, down, left and right to spray snow so that the snow is uniformly applied to the subject V.

Before proceeding with the step (a), check whether there are any abnormalities in the devices and visually inspect the condition of the test object (V).

The standard atmospheric conditions in the steps (c) and (g) are set so that the conditions such as atmospheric pressure, temperature, density, and humidity in the troposphere are close to the average atmospheric condition, and the inside of the climate environment chamber 10 is It is set to produce more accurate results by adjusting similarly to the range. In the present invention, since the temperature and humidity range are important factors, the standard atmospheric conditions can be set at a temperature of 15 to 25° C. and a humidity in the range of 40 to 60%.

In addition, it is preferable to control the temperature in the climate environment chamber 10 in step (d) to reach within an error range of -30°C to ±1°C.

After reaching the temperature inside the climate environment chamber 10 to -30°C as in step (d), as in step (f), the pressure inside the mixing space of the head part 100 reaches 5.5-7 bar. When microdroplets in an aerosol state are sprayed, the microdroplets are transformed into fine particles of snow similar to natural snow in the atmosphere and snowfall.

Common artificial snow manufacturing methods include crushing ice cubes and scattering them with a blower, and as in Registered Utility Model 20-0474081 "Artificial Snow Manufacturing Device", a nozzle is mounted on the front of the blower to spray water molecules and ice cores to form artificial snow. method, etc.

However, the method of crushing ice cubes is completely different from the lamination state of natural snow because ice cubes are crushed finely, and because of their strong cohesive power, they freeze hard during lamination. Water sprayed from the nozzle is not uniformly sprayed into fine particles, so it has a significant difference from natural snow during lamination.

In natural snow, most of the gaps between the crystals of snow are formed as empty spaces, so they have various crystal shapes such as scale leaves, tree branches, and star shapes. Therefore, in natural snow, the coupling between crystals is weak enough to be removed by a blower when snow is piled up. However, the artificial snow made by the conventional method is close to ice grains that are crushed into small pieces of ice, and thus has a lump shape with few empty spaces in the crystal. Therefore, artificial snow is heavy enough to be difficult to remove with a blower when it is snowed, and condensation of crystals easily occurs. Therefore, the artificial snow produced by the existing method is not suitable for the evaluation test of the snow removal equipment.

The natural theory is that microdroplets close to water vapor combine with ice crystals at low temperatures to form snow crystals in various hexagonal shapes depending on the arrangement of water molecules. In other words, when spraying in the state of pulverized fine droplets close to the state of water vapor rather than simply spraying water, snow particles can be generated as close to natural snow as possible.

In the present invention, artificial snow can be generated by uniformly mixing water and air in the head part 100 to generate fine mist.

Compressed water and air are injected into the head part 100, and in the mixing space of the head part 100, water and air are mixed while continuously receiving pressure, and when reaching 5.5-7 bar, the narrow nozzle part 130 It can be crushed while passing through and sprayed in an aerosol state.

At this time, the air may help pulverize the water and form bubbles to form a space by bubbles in the snow crystals like natural snow crystals.

The water-air mixture in the sprayed aerosol state as above is converted into snow crystals by a temperature of -30°C while being sprayed into the climate environment chamber 10 .

As shown in [Fig. 4], it can be confirmed that artificial snow similar to natural snow blown by the wind is not produced as ice particles in the form of granules. 4 , it can be seen that the snow particles are scattered into the climate environment chamber 10 by the wind of the blower. This is very similar to the state of natural snow, and shows a significant difference from general artificial snow.

When the pressure of the head part 100 is less than 5.5 bar, the water particles are not sufficiently pulverized to form ice grains, and since they are continuously sprayed by the nozzle, the pressure in the mixing space can be maintained at 7 bar or less. In particular, in order to generate artificial snow crystals in an optimal state similar to natural snow, it is preferable to apply pressure so that the pressure of the mixing space reaches 6 bar. After reaching 6 bar, you can spray while maintaining the corresponding pressure.

It is preferable to set the snowfall injection time (set time) according to the snowfall condition in step (f) to 10 minutes.

Considering the amount of snow accumulated on the structure in the natural state, the optimal snowfall time is 10 minutes, and if it snows for 10 minutes, approximately 50mm/h can be sprayed per hour. However, depending on the test environment and scale, the snowfall spraying time (set time) can be set in various ways.

As confirmed above, when the apparatus 1, system and method for snowing artificial snow for the test provided by the present invention are used, artificial snow similar to natural snow can be snowed, and the head of the apparatus 1 for artificial snow snowing is used. The artificial snow can be uniformly snowed on the upper surface of the test subject (V) by rotating it up, down, left and right.

In the above, the present invention has been described in detail along with specific examples. However, the present invention is not limited by the above embodiments and may be modified and modified without departing from the gist of the present invention. Accordingly, the claims of the present invention cover such modifications and variations.

1: Device for artificial snow snowfall
100: head
110: water inlet 120: air inlet
130: nozzle unit
200: stand
210: pillar 220: pedestal
300: tilting means
400: rotation means
410: rotation motor
500: elevating means
510: elevating jaw
600 : wheel
10: climate environment chamber
11: temperature/humidity control device 12: temperature/hygrometer
V: test subject

Claims (6)

climate environment chamber (10); The artificial snow snowing device (1) disposed in the climate environment chamber (10); a temperature and humidity control device 11 for controlling the temperature and humidity inside the climate environment chamber 10; and a thermo-hygrometer 12 installed to measure the temperature and humidity inside the climate environment chamber 10; Use the artificial snow snow system for testing, including
The device for artificial snow snowfall (1) includes a head unit 100 having a mixing space therein; an air inlet 120 communicating with the head part 100 and configured to supply compressed air to the mixing space of the head part 100 from the outside; a water inlet 110 communicating with the head part 100 and configured to supply water to the mixing space of the head part 100 from the outside; a nozzle unit 130 communicating with the head unit 100 and configured to spray water and air in an aerosol state when the pressure of the mixing space reaches a critical value; and a stand 200 comprising a pillar 210 and a pedestal 220 supporting the head unit 100 ; consists of,
(a) disposing the subject (V) in the center of the climate environment chamber (10);
(b) moving the artificial snow snowing device (1) to a position where a snowfall operation can be performed on the test subject (V);
(c) controlling the temperature and humidity in the climate environment chamber 10 with the temperature and humidity control device 11 until they reach standard atmospheric conditions, then stop the temperature and humidity control device, and then stop the climate environment chamber ( 10) sealing;
(d) controlling the temperature in the climate environment chamber 10 with the temperature and humidity control device 11 until it reaches -30°C;
(e) injecting water and air into the water inlet 110 and the air inlet 120 of the head part 100, respectively, until the pressure inside the mixing space reaches 5.5-7 bar;
(f) spraying snow for a set time on the test subject (V) according to the snowfall condition with the artificial snow snowfalling device (1);
(g) stabilizing the climate inside the climate environment chamber 10 after controlling the temperature and humidity in the climate environment chamber 10 with the temperature and humidity control device 11 until they reach standard atmospheric conditions; and
(h) visually confirming whether the snowfall operation is uniformly completed on the subject (V); A test artificial snow snowfall method comprising a.
In claim 1,
The artificial snow snowing device (1),
a tilting means 300 for rotating the head part 100 up and down; and a rotating means 400 for rotating the head part 100 left and right; Artificial snow snowing method for testing, characterized in that using what is configured to further include.
In claim 2,
The artificial snow snowing device (1),
Elevating means 500 installed on the pole 210 of the stand 200 and elevating the head part 100 up and down; and a wheel 600 provided at the lower end of the pedestal 220 of the stand 200 to move the stand 200 ; Artificial snow snowing method for testing, characterized in that using what is configured to further include.
In claim 3,
The artificial snow snowfall method for testing, characterized in that in the step (f), the head part 100 is moved up, down, left and right to spray snow so that the snow is uniformly applied to the subject (V).

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