JPH036132Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damper device for difficult snow accumulation, which is attached to an overhead power transmission line and configured to cause snow to fall.

[Conventional technology] When snow falls on an overhead power line in a cold region, the overhead power line twists due to the eccentric moment caused by the snow, and further snow falls on the power line where the snow has fallen, developing into a large cylindrical shape. The heavy weight of the snow can cause power lines to break or towers to collapse.

In order to prevent such accidents, conventionally, as shown in the second diagram, a damper consisting of a clamp 20 and a weight 21 is attached to the overhead power transmission line C. The twisting of the overhead power line is prevented by counteracting the moment caused by The aim was to prevent accidents such as steel towers collapsing.

[Problem to be solved by the invention] When the above-mentioned cylindrical snow accretion on an overhead power transmission line develops so much that the eccentric moment caused by it becomes extremely large, it becomes impossible to counteract it with the moment caused by the weight of the damper. As the overhead power transmission lines twist, the snow does not fall and develops into a large cylindrical shape, which can lead to major accidents such as wire breakage and tower collapse. Dampers had little actual effect in preventing snow accretion accidents.

In addition, a large number of metal balls are housed inside a cylindrical body that is attached to the power line almost horizontally, and the vibration energy of the power line is consumed by friction between the many metal balls. A damper device is known from Japanese Patent Publication No. 31-1834, and furthermore, oil and a weight ball are placed in a horizontal cylinder,
A gear locking damper that prevents gear locking by consuming the vibration energy of a power transmission line through repeated reciprocating motion of a weight ball in oil is known from Japanese Patent Laid-Open No. 10393/1983.
All of these methods prevent vibration of the power line by consuming the vibration energy of the power line by moving the ball inside the cylinder, so they cannot be used as a technical means for dealing with difficult snow accumulation on power lines.

The object of the present invention is to provide a damper device for preventing snow accretion, which prevents snow accretion accidents by applying an impact to overhead power lines to reliably cause snow to fall.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the damper device for difficult snow accretion of the present invention is provided with a hemispherical end portion 3 at the lower end of the cylindrical portion 2 of the cylindrical body 1. An annular protrusion 4 is provided on the inner periphery of the cylinder between the annular protrusion 2 and the hemispherical end 3, and a weight ball 5 having a diameter smaller than the diameter of the inner circumference of the annular protrusion 4 is inserted into the hemispherical end 3. A base 8 of a clamp 7 is attached to the upper end 6 of the cylinder 1, and a collision part 9 is formed at the upper end of the cylinder, where the weight ball 5 collides, and the clamp 7 holds the cylinder 1 perpendicular to the overhead power transmission line. When the vertically hanging cylinder 1 rotates upward with the twisting of the snow-covered overhead power transmission line and tilts upward by more than 90 degrees, the weight ball 5 moves inside the cylinder 1. It is constructed so that it falls suddenly and collides with the collision portion 9 mentioned above.

[Function] When the cylindrical body 1 is installed hanging vertically from the overhead power transmission line, the weight ball 5 in the hemispherical end 3 at the lower end of the cylindrical body 1 is attached to the clamp of the overhead power transmission line. It has a moment based on the product of the distance from the point to the center of the weight ball and the mass of the weight ball, and functions as a weight that resists the twisting force due to the eccentric moment of snow accretion on overhead power transmission lines.

Further, when the cylinder 1 rotates upward about the power transmission line attachment point of the clamp 7 and the hemispherical end 3 rises above the upper end 6 of the cylinder and is tilted obliquely, the hemispherical end 3 The weight ball 5 in 3 has a certain inclination angle (slightly more than 90 degrees from the vertical hanging position)
Until this point, the cylinder is blocked by the annular projection 4 on the periphery of the cylinder and stopped within the hemispherical end 3, but if it tilts beyond that angle (at least far beyond 90 degrees from the vertical hanging position), The weight ball 5 climbs over the annular protrusion 4 due to gravity and rapidly falls within the cylinder 1 toward the lower upper end 6 of the cylinder.

At this time, the clamp 7 attached to the upper end of the cylinder 1
The inner bottom surface portion of the base 8 serves as a collision portion 9 where the weight ball 5 that rapidly moves within the cylinder 1 collides with it;
The impact caused by this collision is transmitted via the clamp 7 to the point where snow has accumulated on the overhead power transmission line.

When snow accretes on an overhead power line to which the snow damper device configured as described above is attached, and the overhead power line is subjected to twisting force due to the eccentric moment of this snow accumulation, the overhead power line receives a twisting force from the overhead power line as described above. The weight ball 5 in the hemispherical end 3 at the lower end of the cylinder in a hanging state
moment acts against this twisting force, and this prevents the overhead power line from twisting due to snow accumulation, causing the snow to fall under its own weight before it can develop significantly.

If the snow on the overhead power transmission line is heavily accumulated and the snow does not fall off early as described above and develops into a large cylindrical shape on the longitudinal side of the overhead power transmission line, the following steps can be taken to prevent large snow accumulation. make snow fall.

In other words, when the eccentric moment due to the weight of snow protruding from the side of the overhead power line causes the overhead power line to twist, the cylindrical body 1 hanging down from the power line also twists around the clamp 7. Rotates upwards about the power line attachment point.

In this way, when the cylinder 1 is rotated upward by more than 90 degrees from the vertically hanging position and the hemispherical end 3 is tilted upward, the hemispherical end 3
The inner weight ball 5 climbs over the annular protrusion 4, rapidly slides within the cylinder 1, and falls and collides with the collision part 9 at the upper end of the cylinder, which is now in the lower position. The impact upon collision with the collision portion 9 is transmitted to the snow attachment point on the overhead power transmission line, causing the snow to fall.

As mentioned above, when the snow falls, the overhead power lines that have been twisted due to the eccentric moment of the snow will no longer have the eccentric moment of the snow that provides twisting force, so they will return to their original untwisted state, and along with this, The cylindrical body 1, which had been rotated and tilted obliquely upward, also returns to its original state where it hangs vertically from the overhead power transmission line. As a result, the weight ball 5 that has collided with the collision portion 9 at the upper end of the cylinder again climbs over the annular protrusion 4 on the periphery of the cylinder and returns to the inside of the hemispherical end 3.

In this way, each time a large amount of snow that twists the overhead power transmission line occurs, the cylinder 1 and the weight ball 5 repeat the above-mentioned operation to cause the snow to fall.

[Example] An embodiment of the present invention will be described below with reference to FIG.

1 is a cylindrical body, which is composed of a cylindrical part 2 and a hemispherical end 3 connected to the lower end of this cylindrical part 2, and has an annular projection 4 on the periphery of the cylindrical body between the cylindrical part 2 and the hemispherical end 3. It has been established.

Reference numeral 5 denotes a weight ball having a smaller diameter than the inner diameter of the annular projection 4, and the weight ball 5 is attached to the hemispherical end portion 3.
Put it inside.

7 is a clamp, whose base 8 is connected to the cylindrical body 1;
Attach it to the upper end 6 of the Reference numeral 9 indicates the bottom portion of the base portion 8 inside the cylinder body 1. This clamp 7 is configured such that a fixed semicircular part 10 and an opening/closing semicircular part 11 are connected by a pivot pin 12, and the overhead power transmission line C is held between both semicircular parts 10 and 11 and fixed with a bolt 13. The bottom surface portion 9 of the base portion 8 is a collision portion when the weight ball 5 comes out from within the hemispherical end portion 3 and moves within the cylinder body 1 toward the base portion 8 of the upper end 6 as described later. 9
form.

In the damper device for difficult snow accumulation of the present invention constructed as described above, the cylindrical body 1 is vertically suspended from the overhead power transmission line C and attached with the clamp 7.

When snow accretes on this overhead power line and the overhead power line receives a twisting force due to its eccentric moment, the moment of the weight ball 5 in the hemispherical end 3 at the lower end of the cylinder 1 counteracts this twisting force. This prevents the overhead power lines from twisting, causing the snow to fall quickly under its own weight without developing much.

When the snow on the overhead power transmission line is heavy and does not fall quickly and develops into a large cylindrical shape and the overhead power line is twisted, the cylindrical body 1 also rotates upward and rotates by more than 90 degrees. When moved and tilted upward, the hemispherical end 3
The inner weight ball 5 climbs over the annular protrusion 4, rapidly slides inside the cylinder 1, and collides with the collision part 9, and this impact causes snow to fall.

In this way, snow accreted on overhead power lines is reliably removed and snow accretion accidents are prevented from occurring.

When the snow falls, the overhead power transmission line returns to its untwisted state, the cylindrical body 1 also returns to its initial state of hanging vertically from the overhead power transmission line, and the weight ball 5 returns to the inside of the hemispherical end 3.

[Effects of the invention] As mentioned above, the present invention inserts a weight ball into the hemispherical end of the lower end of a cylinder that hangs perpendicularly to the overhead power transmission line, and uses it to control the eccentric moment of snow accretion on the overhead power transmission line. Since the weight is used to resist the twisting force caused by the overhead power transmission lines, it is possible to prevent twisting of the overhead power transmission line and to quickly remove accumulated snow.

In addition, when the overhead power line is twisted due to heavy snow accumulation, the weight ball collides with the collision area and applies a shock to the snow accumulation area, so even large snow accumulation can be dropped reliably. This makes it possible to reliably prevent accidents such as power transmission line disconnections and tower collapses.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. 1: Cylindrical body, 2: Cylindrical part, 3: Hemispherical end, 4:
Annular projection, 5: Weight ball, 6: Upper end of cylinder, 7: Clamp, 8: Clamp base, 9: Collision part.

Claims (1)

[Scope of utility model registration request] An annular projection 4 is provided on the inner circumference of the cylinder between the cylindrical portion 2 of the cylinder 1 and the hemispherical end 3 at the lower end.
A weight ball 5 having a smaller diameter than the inner circumference of the hemispherical end 3
the base 8 of the clamp 7 on the upper end 6 of the cylinder 1.
The cylinder 1, which is attached vertically to the overhead power transmission line with the clamp 7, is tilted upward by 90 degrees or more, and the collision part 9 where the weight ball 5 falls inside the cylinder 1 and collides with the cylinder 1 is connected to the cylinder. A damper device that prevents snow from accreting on the upper end of the body.