JPH0625718B2 - Artificial snow landing method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is a method of artificially reproducing a natural snowfall of 0 ° C. or less in order to observe a situation in which a snow-covered object is snowing. In particular, the present invention relates to a method and a device for attaching snowflakes to a snow-covered object in a laboratory by using natural snowfall of 0 ° C. or lower as snow in order to obtain a state as close as possible to the natural world.

[Prior Art] An overhead power transmission line in a snowfall region may have a gear-looping vibration due to snow accretion that causes the power transmission lines between adjacent phases to be too close to each other, causes a short circuit between the phases, or causes a disconnection in the worst case. Since it is extremely difficult to observe the development status of snow accretion that causes such a bad condition for the actual line of the overhead power transmission line laid in the mountainous area with a lot of snowfall in winter. In the past, it has been practiced to simulate it in the laboratory.

The conventional method is to collect snow that has landed on the ground, crush it into small pieces, spray water on the snow to make it wet, and then spray the snow onto the power line. It was attached.

[Problems to be Solved by the Invention] However, the snow accumulated on the ground is not a little compacted, and the mechanical force of breaking it into small pieces is applied, and water is sprayed to make it snow. As a result, the snowflakes are destroyed, and the snowflakes sprayed in such a state have a different quality from the snowflakes that naturally fall, and the snowfall condition of natural snowfall is reproduced. It becomes impossible.

[Means for Solving the Problem] The present invention is directed to a natural snowfall piece, which is softly landed and continuously carried in from the outdoors to the inside, and exposed to an atmosphere of 0 ° C. or higher so that the snowflake crystal is not destroyed. The present invention is a snow landing method of continuously spraying and adhering the snow body onto a snow-covered body, and another invention is to carry on a carrying-in device continuously installed both outdoors and indoors, and on a carrying-in device outdoors. A soft landing piece of natural snowflake that has been made indoors in an atmosphere of 0 ° C or higher to a humidity condition that does not destroy the snowflake crystals, and a device for peeling off the snowflake from the above-mentioned carry-in device, and the peeled snowflake is applied. A snow landing device comprising a device for spraying snow objects.

[Operation] According to the present invention, since the natural snowflakes are softly landed on the carry-in device and continuously carried in from the outdoors to the indoors, the snow is not crushed as when collecting snow accumulated on the ground. In addition, no mechanical force is applied to the snowflakes when they are carried in. Also, in the case of wet snow, without adding (spraying) water other than natural snowfall,
The temperature of the indoor atmosphere is simply set to 0 ° C or higher, and since the snowflakes are peeled off from the carry-in device by blowing air without using solid matter such as a brush, the snowflakes can be removed from the air. As well as flying, the snowflake crystals remain almost as they were during natural snowfall.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
1 is a building, 2 is its indoor, 3 is outdoor, 4 is a carry-in device,
Here, a conveyor belt device is shown, 5 is the conveyor belt, 6 is a guide roller, and 7 is a drive roll, and this conveyor belt device is installed continuously from indoor 2 to outdoor 3. 8 is a blowing device, 9 is a nozzle at its tip, the direction of which is directed to the upper surface of the end of the conveyor belt 5 so that air is blown from the nozzle 9 from above to below. Reference numeral 10 is a wind tunnel that guides the air ejected from the nozzle 9 from top to bottom, 11 is another blowing device, and 12 is a wind tunnel that guides the air ejected from there, from left to right in the figure. , Is connected to the wind tunnel 10 at a right angle, and the right end is an open end. Thirteen
Is an electric wire to be tested, which is placed horizontally at the open end and at a right angle to the wind tunnel 12. 14 is a natural snowflake.

In the outdoor 3, the natural snowfall 14 softly landed on the rotating conveyor belt 5 is carried in the direction of arrow A from left to right in the drawing, and is carried into the indoor 2 from the outdoor 3. The indoor 2 is maintained in an atmosphere at a temperature of 0 ° C. or higher but close to 0 ° C. Here, the snow flakes 14 are placed on the belt 5 and are in a humidity state such that their crystals are not destroyed. The snowflakes 14 maintain such a state and reach the right end of the belt 5, where they are separated (blown away) from the belt 5 by blowing air from the nozzles 9 of the blowing device 8 and are shown by an arrow B in the drawing. Direction is guided into the wind tunnel 10. The wind tunnel 10 is perpendicularly connected to the wind tunnel 12 of the other blowing device 11, and the air is blown in the direction of the arrow C through the wind tunnel 12, so that the snow flakes 14 are turned in the direction of the arrow C and the wind tunnel is changed. It is blown out from the open end on the right side of 12. An electric wire 13 to be used for the test is placed at a right angle on the open end, and snowflakes 14 are sprayed and attached to the electric wire 13.

Here, as the belt 5, it is preferable to use a belt whose surface is covered with a film made of ethylene tetrafluoride resin so that the snowflake 14 can be easily peeled off even if the snowflakes 14 become wet. The indoor temperature for moistening is preferably 0 ° C. to 2 ° C., and the control of the moistening is not limited to the temperature control of the atmosphere in the indoor 2 but depends on the snow quality of the outdoor snowflakes 14 to convey the conveyor belt 5. And the temperature of the air blown in the wind tunnels 10 and 12, etc. Further, in this embodiment, the wind tunnels 10 and 12 are connected at a right angle as a blowing device.
Two devices 8 and 11 are shown, which are used for peeling snowflakes 14 from the belt 5 and for removing the snowflakes 14 from the electric wire 1.
If both the effects of spraying and adhering to 3 are satisfied, only the spraying device 8 may be provided, and the tip of the wind tunnel 10 of the spraying device 8 may be an open end and the electric wire 13 to be tested may be placed there.

In addition, when the amount of snowfall per unit time is small, the snowflakes 14 falling on other than the belt 5 are received by, for example, a sieve, and the snowflakes 14 are sifted on the belt 5,
You can also increase the amount of snowfall.

[Effects of the Invention] As is apparent from the above description, according to the artificial snow landing method and the device thereof of the present invention, the natural snowfall piece 14 is softly landed on the carry-in device 4 in the outdoors 3 while the indoor snow 2 is used as it is. It is transferred to a room and exposed to an atmosphere at a temperature close to 0 ° C. in the indoor 2 so that the snow is moistened to such an extent that the crystals are not destroyed, and the snow flakes are blown onto the snow-covered object by blowing air. It is possible to reliably attach snowflakes having a crystal state during natural snowfall almost unchanged to a snow-covered object such as.

Therefore, it contributes greatly to the investigation and observation of various problems of overhead power transmission lines related to snow accretion.

[Brief description of drawings]

The drawing is a side view showing an example of an apparatus for carrying out the method of the present invention. 1: Building, 2: Indoor, 3: Outdoor, 4: Carrying device, 5: Conveyor belt, 6: Guide roller, 7: Drive roll, 8:
Spraying device, 9: nozzle, 10: wind tunnel, 11: spraying device, 12: wind tunnel, 13: electric wire, 14: natural snowflake.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Yasui 1-3-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo Tokyo Electric Power Co., Inc. (72) Takao Naito 1-3-1 Uchisai-cho, Chiyoda-ku, Tokyo East Within Kyoden Electric Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 63-140269 (JP, A) Actually developed 61-40651 (JP, U)

Claims (4)

[Claims] 1. A natural snowfall piece is softly landed and continuously carried in from the outdoors to the inside, and exposed to an atmosphere of 0 ° C. or higher to a humidity condition that does not destroy the crystals of the snowflakes, and to the snow-covered object. An artificial snow landing method characterized by continuously spraying and adhering. 2. A snowflake crystal is not destroyed indoors in an atmosphere of 0.degree. C. or more between a carry-in device continuously installed outdoors and indoors and a natural snowflake softly landed on the carry-in device outdoors. An artificial snow accretion device comprising: a device for exfoliating an object, which has been kept in a humidity state of about a degree, from the above-mentioned carry-in device by spraying, and a device for spraying the exfoliated snowflakes on a snow-covered object. 3. The carrying-in device continuously installed outdoors and indoors is a belt conveyor device.
The artificial snow landing device described. 4. The artificial snow landing device according to claim 2, wherein the device for blowing off the snow flakes from the carry-in device and the device for blowing the peeled snow flakes onto the snow-covered object are one blowing device. .