JPH0313936Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a snow-resistant double tension yoke used in a tension insulator device in a power transmission line overhead wire fitting.

<Prior art> Conventionally, this type of double yoke that has been commonly used is a simple triangular yoke body with a predetermined thickness, with retaining holes at both ends and a support hole at the top of the center. Consists of a flat plate (see Figure 5),
For this reason, the form used as a double tension device is
As shown in FIGS. 5 and 6, the flat surfaces of the dual yokes are mounted in the upper and lower positions. Of course, in this case, the horn is configured to protrude toward the insulator chain side with the flat surface of the double yoke as a base point.

Here, the snow cap on the overhead wire fittings due to snowfall is usually caused by the snow A accumulated on the tower arm developing laterally from the end of the arm, as shown by the dashed line in Fig. 6, and the double yoke. As the road progresses, the snow gradually falls on the insulator side. If we observe this snow cap condition in detail, the overhang of the snow cap grows diagonally as shown in the figure, so the entanglement of snow (snow cap) on the arching horn that is integrally protruded from the double yoke also becomes a unilateral load. , the horn itself is torsionally deformed, the coordinates are shifted, a predetermined horn gap Z cannot be obtained, and the horn is often crushed. That is, the conventional double yoke made by simply cutting an iron plate into triangular shapes has a flat surface, which can lead to extremely large snow caps and damage the horn. Therefore, the emergence of this type of tension-resistant yoke to prevent snow damage is awaited.

<Problems to be solved by the invention> In view of the above-mentioned circumstances, the present invention aims to expand the problem of deformation of the horn from the conventional snow damage prevention measures for overhead wire fittings, which were limited to measures against deformation of the insulator device itself. The purpose is to provide a snow-covered double tension yoke.

<Means for solving the problem> The present invention is a tension insulator device in which a cylindrical yoke base with a predetermined length is arranged horizontally, and a support hole is formed at the tip in the center of the yoke base. A mounting portion in which the base of the drilled mounting plate is attached with a collar-like fit, and retaining holes are bored at the ends of the yoke base body, the ends of which protrude in positions symmetrical to the direction in which the mounting plate protrudes. The bases of the plates are attached to each other by a collar-like fit to form a tension-resistant yoke having a one-point support portion and a two-point anchoring portion. In this case, the surface of the yoke base, which is the main body of the yoke, is coated with a coating having a small friction coefficient to improve snow-covered sliding.

<Function> Due to the above-mentioned configuration, when using the two series of insulator series under tension, the insulator series are respectively connected to the retaining holes of the pair of mounting plates in the same manner as the conventional double tension yoke, and in this state. The support hole of the mounting plate protruding to a symmetrical position located in the center may be engaged with the tower mounting bracket disposed on the tower arm and then pulled up. In this state, even if the snow cap that grows from the tower arm side advances to this double tension yoke, the surface of the yoke base, which is the main body of the tension yoke, is an arc based on the pipe. The snow cap slides down and does not apply any load to the horn attached to the tension yoke.

<Example> Hereinafter, the present invention will be described in detail based on the drawings of the example.

Reference numeral 1 denotes a cylindrical yoke base using a pipe with a predetermined length (approximately the same as a conventional double yoke), which is arranged horizontally, and a mounting plate with a support hole 2 bored at the tip in the center of the yoke base 1. Fitting hole 4 at the base of 3
The yoke base body 1 is attached from one end in a brim-like manner, and both edges of the fitting hole 4 are fixed with welds a. In addition, a fitting hole 4 at the base end of the attachment plate 3 having a retaining hole 2' at the tip is provided at both ends of the yoke base 1 so that the retaining hole 2' side is in the direction in which the tower body side attachment plate 3 protrudes. They are arranged so as to face in a symmetrical position (opposite side) and fitted in a collar-like manner, and both edges are welded and fixed to form a snow-resistant double tension yoke 5 as a whole. In this case, the surface of the cylindrical yoke base 1 is coated with a sliding coating 6, such as a film-like polyethylene coating, which has a low coefficient of friction of about 0.125 and has heat retention properties, thereby creating a surface that is difficult for snow to adhere to. It constitutes. In addition, the yoke base 1
Needless to say, caps 7 are fitted to both edges of the cap 7 to form a closed lid.

By the way, the size of the cylindrical yoke base 1 is 410 mm in length for a 33 ton insulator chain type.
90φ, pipe inner thickness 7mm.

To explain this effect now, first, when using the double tension yoke 5 as a tension device, the attachment plates 3, 3 provided at both ends of the tension yoke 5, as in the conventional plate type double tension yoke, are used. In the retaining holes 2', 2', 2
The ball clevises 9, 9 disposed at the base ends of the insulator chains 8, 8 are connected, respectively. On the other hand, the support hole 2 of the central mounting plate 3, which protrudes in a symmetrical position with the mounting plates 3, 3, is connected to the mounting bracket 12 of the tower arm 11 through a right-angled clevis 10, providing one-point support.

Here, the snow cap A that has accumulated on the tower arm 11 side due to snowfall gradually grows and develops toward the insulator chain 8 side, and the double tension yoke 5 is connected to the right angle clevis 10 connected to the mounting bracket 12 of the tower arm 11. Even if the yoke base 1, which is the main body of the yoke, has a cylindrical structure and the surface 1a is an arc, the snow cap A will slide back and forth and cause the snow cap A to fall on the yoke base 1. It's fleeting. Of course, the mounting plates 3, 3, 3 arranged on these three sides do not come close to seeing the snow cap because of the narrow width of the orthogonal brim-like fittings. In addition, this yoke base 1
Since the surface 1a is provided with a sliding coating 6 which is a polyethylene layer, it is possible to ensure that the snow cap A that has grown will fall from this point as well.

Therefore, the horn mounting portions 3a, which are bulged and formed on the mounting portion plates 3, 3 disposed at both ends of the double tension yoke 5,
Snow cap A on the horn 13 with the base end attached at position 3a
The horns 13 do not overlap, the horn 13 does not undergo torsional deformation, and a predetermined gap can be maintained between the horn 14 and the opposing horn 14.

<Effects of the invention> As mentioned above, the snow-resistant double tension yoke of the present invention has a cylindrical yoke base with the yoke main body arranged horizontally, and a mounting plate for the support point and two plates for the anchorage. By adopting a single structure with a brim-like fit so that the mounting plate protrudes in a symmetrical position, even if a snow cap that grows from the steel tower side reaches the double tension yoke, the surface of the yoke will not touch the pipe. Because it has a circular arc, unlike a conventional flat surface, it easily slides down and does not apply snow-covered loads to the horn side, that is, it is a safe type that does not cause torsional deformation of the horn. Of course, in this case, since the surface of the cylindrical yoke base body is coated with a sliding coating, falling of the snow cap is also ensured from this point of view. In addition, since these three mounting plates are fixed to the cylindrical yoke base with a brim-like fit, the plate is of a robust type with no risk of separation even when subjected to large tension. In addition, this yoke base has practical effects such as being easy to manufacture as it is sufficient to cut a pipe having a predetermined wall thickness. Although the above explanation has been given for two tension yokes, when using a three tension yoke, it is possible to integrally attach a mounting plate with retaining holes on the opposite side of the mounting plate for the tower body placed in the center. Various tension yokes can be used.

[Brief explanation of drawings]

Fig. 1 is a plan view of the present invention, Fig. 2 is a side view, Figs. 3 and 4 are a plan view and side view of the device in use, and Fig. 5 is a plan view of the invention.
6 are a plan view and a side view of the conventional product in use. 1... Cylindrical yoke base, 2... Support hole, 2'
...Retaining hole, 3...Mounting plate, 4...Fitting hole.

Claims (1)

[Scope of utility model registration request] A cylindrical yoke base 1 having a predetermined length is formed horizontally, and a support hole 2 is provided in the center of the yoke base 1.
The base of the tower-side attachment plate 3, which is arranged at the tip, is provided with a vertical orthogonal protrusion by fitting the yoke, and retaining holes are provided at the tips of the yoke base 1, which protrude in symmetrical positions with the attachment plate 3, at both ends of the yoke base 1. 2', the insulator side mounting plate 3
A snow-resistant double tension yoke with a vertical orthogonal protrusion at the base of the yoke that is fitted with a flange.