JP2002064925A - Fixing yoke for multi-conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a clevis from being damaged by the yoke hardware eve if a fixing yoke is turned for the multiple conductors stretching upper and lower the transmission lines. SOLUTION: The body (1a) of the fixing yoke (1) for the multi-conductors has an opening in the direction of the stretched transmission lines at the upper and lower front ends of the body (1a) when the fixing yoke (1) for the multi- conductors is viewed from the side with the transmission lines stretched, clevises (2), (3) for connecting the yoke hardware (Y1), (Y2) connecting the transmission lines, and an insulator string mounting part 4 at the roughly central part of the body (1a). A recessed part which avoids livered move of the upper clevis (2) caused by the turn of the yoke hardware (Y1) and generated when the upper transmission line is installed is provided under the back of the opening (2a) of the upper clevis (2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed yoke for a multiconductor, which is used to connect upper and lower transmission lines to a transmission line tower using insulator strings.

[0002]

2. Description of the Related Art FIG. 6 shows a fixed yoke for a multiconductor (hereinafter referred to as a "fixed yoke") used when a conventional transmission line having two upper and lower wires is connected to a transmission line tower using two insulator trains. ) Is a view of a state in which a transmission line (not shown) is stretched over a transmission line tower (hereinafter, referred to as a “tower”) as viewed from the side.

The fixed yoke 10 is made of cast iron, and has a substantially L-shaped main body 10a having a long bottom when viewed from the side.
Having. Clevis portions 11 and 12 each having an opening opening in the lateral direction, that is, in the direction of the stretched transmission line, are provided at the end of each L-shaped side of the main body 10a. Yoke fittings Y1 and Y2 having a substantially triangular planar shape are attached to the portions 11 and 12, respectively, at one apex portion thereof.

[0004] The upper two transmission lines (not shown) are attached to the other two apexes of the yoke fitting Y1 via a connecting fitting A composed of a vernier fitting or the like. Also, the yoke fitting Y2 located below has
In the same manner as the yoke fitting Y1 located above, the lower two transmission lines are respectively attached.

[0005] In FIG.
It is provided integrally with the main body 10a so as to protrude from both sides of the main body 10a. The insulator B is attached to both sides of the insulator mounting piece 13 via the connecting metal fittings 14, respectively. The other end (the left end in FIG. 6) of the insulator string B shown in FIG. 6 is attached to a steel tower, not shown.

[0006]

However, as shown in FIG. 6, the above-mentioned conventional fixed yoke has an insulator B
When the transmission line is first mounted on the upper clevis 11, for example, when the transmission line is first mounted on the upper clevis 11, the yoke fitting Y1 There is a possibility that the clevis portion 11 may break or be damaged due to a twisting motion. More specifically, referring to FIG. 7, an upper transmission line is first attached to the fixed yoke 10. When the transmission line is attached to the fixed yoke 10, the fixed yoke 10 is connected to the connecting bracket 14 of the insulator series B. Pivot 1
4a, that is, the shaft center of the insulator string B and the extension direction of the transmission line attached via the connection fitting A act in a straight line (see the dashed line in FIG. 7). The yoke fitting Y1 is the opening 11 of the clevis portion 11.
There is a possibility that the yoke fitting Y1 breaks or damages the clevis portion 11 by rotating and twisting in the area a.

FIG. 8 is an enlarged view of the part B in FIG. 7, where the part indicated by a black circle indicates the part where the yoke fitting Y1 is in contact with the clevis part 11, and the part indicated by a white circle is The portion in contact with the connection pin P is shown. As described above, when the yoke fitting Y1 rotates within the clevis portion 11, the yoke fitting Y1 comes into contact with the clevis portion 11 as shown by a black circle, and there is a possibility of damage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a fixed yoke in which a clevis portion is not damaged by a yoke fitting especially when a transmission line is attached.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a multi-conductor fixed yoke in which a power transmission line is stretched from the side of the multi-conductor fixed yoke. At the top and bottom tips of the body when viewed,
An opening having an opening in the direction of the transmission line to be stretched, a clevis portion for connecting a yoke fitting for connecting the transmission line, and an insulator connecting portion in a substantially central portion of the main body. In the conductor fixed yoke, a concave portion is provided in a lower part of the opening of the upper clevis portion to avoid twisting of the upper clevis portion due to rotation of the yoke fitting generated when an upper transmission line is attached. It is characterized by. Further, a cutout is provided at an upper portion of the entrance of the opening of the upper clevis portion to prevent twisting of the upper clevis portion due to rotation of the yoke metal fitting which occurs when an upper transmission line is attached.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a fixed yoke according to an embodiment, and FIG. 1 (a) is a front view of a state where a power transmission line (not shown) is stretched over a steel tower as viewed from the side. FIG. 2B is a plan view thereof. FIG. 2 shows FIG.
FIG. 3A is a left side view of FIG. 3A, and FIG.
1 (b) is a sectional view taken along line A2-A2 in FIG. 1 (a). FIG. 4 is an explanatory diagram when an upper transmission line is attached to the upper clevis portion.

The configuration of the fixed yoke 1 according to the present invention other than the upper clevis portion 2 is basically the same as that of the conventional product shown in FIG. That is, the fixed yoke 1 is made of cast iron, and includes a main body 1a, clevis portions 2 and 3 provided at upper and lower ends of the main body, and an insulator connecting piece 4 provided at an intermediate position of the main body. ing. The main body 1a has a substantially L-shape with a long bottom when viewed from the side. Clevis portions 2 and 3 each having an opening opening in the lateral direction, that is, in the direction of the stretched transmission line, are provided at the end of each L-shaped side of the main body 1a. The parts 2 and 3 are configured such that yoke fittings Y1 and Y2 each having a substantially triangular planar shape are respectively attached at one vertex portion thereof.

Of these clevis parts 2, 3, the upper clevis part 2 is provided with a recess 2b formed so as to go under the lower part of the opening 2a, and has a notch at the upper part of the opening. The notch 2c formed as described above is provided.

The upper two transmission wires are attached to the other two apexes of the upper yoke fitting Y1 connected to the upper clevis portion 2 via a connecting fitting A8 composed of a vernier fitting or the like (see FIG. 4). Have been. Further, the lower two yoke fittings Y2 connected to the lower clevis portion 3 are attached with lower two transmission lines in the same manner as the upper yoke fitting Y1.

In FIG. 1 and FIG. 2, reference numeral 4 denotes an insulator continuous mounting piece which corresponds to the insulator continuous mounting portion of the present invention, and is provided integrally with the main body 1a so as to protrude from both sides of the main body 1a. . Mounting holes 4a and 4b are provided on both sides of the insulator continuous mounting piece 4, respectively. Mounting holes 4a,
An insulator string (not shown) is attached to 4b via a connection fitting 5. The holes of the insulator connecting piece 4 other than the mounting holes 4a and 4b shown in FIG. 1B are holes to which tools such as a wheel and the like are attached when the transmission line is attached.

In the fixed yoke having the above structure, after the transmission line is connected to the upper clevis portion 2, the lower clevis portion 3
Until the transmission line is connected to the fixed line, the fixed yoke mainly rotates around the pivotal connection portion 5a of the connection fitting 5 of the insulator B. Accordingly, the yoke fitting Y1 also rotates within the opening of the clevis portion 11, but the yoke fitting Y1 only contacts the upper and lower portions of the connection pin P opposite to each other.
Since the concave portion 2b and the cutout portion 2c are provided in the lower part of the opening and the upper part of the entrance of the opening, the tip and the intermediate point of the yoke fitting Y1 are shown in FIG. Do not make point contacts. Therefore, breakage and damage of the clevis portion 2 can be prevented.

Prevention of the damage will be further described with reference to FIGS. 4 and FIG. 5 which is an enlarged view of a portion A of FIG. FIG. 4 shows that the fixed yoke 1 is pivoted about the pivot 5a of the connection fitting 5 of the insulator B when the transmission line is attached to the upper clevis portion 2 as in FIG. In FIG. 5, white circles indicate contact portions between the yoke fitting Y1 and the connection pins P, similarly to the white circles in FIG. However, the concave portion 2b and the notch 2
Since c is provided, even if the yoke fitting Y1 rotates, it only contacts the upper and lower opposite parts of the connection pin P but does not contact the clevis portion 2. Even if the yoke fitting Y1 further rotates, the connection pin P
The upper and lower sides of the upper clevis, the recess 2b and the notch 2c are in surface contact, and the force applied to the upper clevis portion 2 from the yoke fitting Y1 is distributed to the contact surfaces. In any case,
Breakage and damage of the clevis portion 2 are prevented beforehand.

In the above-described example, the fixed yoke 1 has an L-shape. However, the fixed yoke 1 may have an inverted L-shape in which the horizontal side of the L-shape is located at the top. A fixed yoke which does not have a character shape, that is, a fixed yoke having an insulator mounting piece 4 at an intermediate position and having a clevis portion at an upper portion and a lower portion of a fixed yoke may be used.

[0018]

According to the present invention, the main body of the fixed yoke is extended at the upper and lower ends of the main body when the fixed yoke is viewed from the side with the transmission line extended. Multi-conductor fixing having an opening opening in the direction of the power transmission line, having clevis portions for connecting yoke fittings for connecting the power transmission line, and having an insulator continuous mounting portion substantially at the center of the main body. In the yoke, a concave portion is provided at a lower portion of the opening of the upper clevis portion to avoid twisting of the upper clevis portion due to rotation of the yoke metal fitting which occurs when an upper transmission line is attached. Even if it rotates, the clevis part can be effectively prevented from being damaged. Further, in the case where a cutout portion formed so as to cut out the upper portion of the inlet is provided at the upper portion of the inlet of the opening of the clevis portion provided at the upper portion, it is possible to further prevent the clevis portion from being damaged. .

[Brief description of the drawings]

FIG. 1A is a front view of a fixed yoke according to an embodiment of the present invention when viewed from a side with a transmission line stretched, and FIG. 1B is a plan view thereof. is there.

FIG. 2 is a left side view of FIG.

FIG. 3A is a cross-sectional view taken along line A1-A1 in FIG.
FIG. 2B is a sectional view taken along line A2-A2 in FIG.

FIG. 4 is an explanatory diagram when a transmission line is attached to an upper clevis portion.

FIG. 5 is an enlarged view of a part A of FIG. 4;

FIG. 6 is a front view when a transmission line is stretched over a conventional fixed yoke when viewed from the side thereof.

FIG. 7 is an explanatory view when a transmission line is attached to a clevis portion of a conventional fixed yoke.

FIG. 8 is an enlarged view of a part shown in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed yoke for multiple conductors (fixed yoke) 2 Clevis part 2b Concave part 2c Notch part 3 Clevis part 4 Insulator continuous mounting piece 4a, 4b Mounting hole 5 Connection fitting Y1, Y2 Yoke fitting

Claims (2)

[Claims] 1. A main body of a multi-conductor fixed yoke having upper and lower ends of the main body when the multi-conductor fixed yoke in a state where a transmission line is stretched is viewed from a side,
An opening having an opening in the direction of the transmission line to be stretched, a clevis portion for connecting a yoke fitting for connecting the transmission line, and an insulator connecting portion in a substantially central portion of the main body. In the conductor fixed yoke, a concave portion is provided in a lower part of the opening of the upper clevis portion to avoid twisting of the upper clevis portion due to rotation of the yoke fitting generated when an upper transmission line is attached. A fixed yoke for multiconductors, characterized by the following. 2. A cut-off portion is provided at an upper portion of an entrance of an opening of the upper clevis portion to prevent twisting of the upper clevis portion due to rotation of the yoke fitting which occurs when an upper transmission line is attached. The fixed yoke for multiconductors according to claim 1.