JP4201387B2 - Suspended tension device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspended tension device , and more particularly, to a shear pin that is cut when an unbalanced tension is generated in a transmission line stretched between right and left tension insulators .
[0002]
[Prior art]
Figure 3 is a front view of a partially omitted left pendant shaped tension device in a conventional unbalanced tension generating cope, 4 (a) is an enlarged front view and FIG. 4 shows in cutaway a portion thereof ( FIG. 4B is a right side view of FIG.
[0003]
In the figure, 1 is a mounting bracket that is attached to an arm (not shown) of a transmission line tower, 2a and 2b are bifurcated suspension members that are suspended from the mounting bracket 1 via a support shaft 3, and 4a and 4b. Is supported by the lower ends of the suspension members 2a and 2b via the support shaft 5, and normally, the two intermediate members 6 provided in an upright state are positioned between the intermediate members 4a and 4b. It is an elongated triangular vertical member whose upper end is pivotally supported via a support shaft 7 at the upper end of the members 4a and 4b. This is below the opposite ends of the vertical member 6, (left drawing) strain insulator device 9,9 through a support shaft 8a, 8b are referred coupled pair.
[0004]
In the drawing, reference numeral 10 denotes a shear pin, which is provided in the vicinity of the middle between the support shaft 5 and the support shaft 7. In other words, the shear pin 10 is provided so as to penetrate between the intermediate members 4a and 4b and the vertical member 6, and these members are connected. Therefore, when the unbalance tension acting on the lower end of the vertical member 6 is not so great as to shear the shear pin 10, the intermediate members 4a, 4b and the vertical member 6 can be kept in an overlapping state.
[0005]
In suspension-like tension device configured as described above, for example, if the cutting accident wire feed you located on the left side (not shown) occurs, shocking unbalanced tension strain insulator device 9 side located on the right generates To do.
[0006]
When the shear pins 10 by an unbalanced tension such as this is cut, as shown in FIG. 5, because the intermediate member 4a, the constraint between 4b and the vertical member 6 is released, hanging members 2a, 2b, The intermediate members 4a and 4b and the vertical member 6 change in a straight line, so that the impact at the time of cutting the transmission line can be reduced, and the transmission line tower and the like can be protected.
[0007]
Although omitted in FIGS. 3 and 4, when the suspension members 2a and 2b, the intermediate members 4a and 4b, and the vertical member 6 are opened in a straight line, the spring members and the like are gradually opened. (For example, No. 3-6971, No. 6972).
[0008]
[Problems to be solved by the invention]
The conventional suspended tension device has the feature that it can reduce the impact when a tension imbalance occurs due to a transmission line disconnection accident, but if the catenary angles of the left and right transmission lines differ greatly, In some cases, unnecessary force was applied to the shear pin. For this reason, there was a possibility of hindering the original function of the shear pin in an emergency.
[0009]
That is, as shown in FIG. 3, the catenary angles α1 and α2 of the left and right power transmission lines are substantially equal (the catenary angles α1 and α2 are both below the horizontal line passing through the support shafts 8a and 8b. When the difference (α1−α2) is substantially equal to 0), the longitudinal axial direction of the suspension members 2a and 2b and the longitudinal axial direction of the intermediate members 4a and 4b coincide with each other. Although unnecessary force does not act on the shear pin 10, for example, the catenary angles α1 and α2 of the left and right power transmission lines are greatly different as shown in FIG. 6 depending on the installation conditions of the power transmission lines (the catenary angle α1 is supported). while the upper side of the horizontal line passing through the axis 8a, so catenary angle α2 is below the horizontal line passing through the support shaft 8b, and the difference ([alpha] 1-alpha-2) is large.), Ri suspended in accordance with the difference The axial direction of the members 2a and 2b and the axial direction of the intermediate members 4a and 4b DOO becomes a cross state (see angle β in FIG. 6), unnecessary force to shear pins 10 there is a disadvantage that act.
[0010]
Of course, the shear pin 10 is designed so that it can sufficiently cope with the above-described force, but it has been desired that an unnecessary force does not act on the shear pin 10 at all times.
[0011]
The present invention has been made to meet the above-mentioned demand, and its purpose is a suspended shape in which unnecessary force does not act on the shear pin at all times even if the catenary angles of the left and right transmission lines are different. It is to provide a tension device .
[0012]
[Means for Solving the Problems]
This onset Ming, in order to achieve the above object, a mounting bracket attached to the arm of the transmission line tower, a hanging member which is hung on the mounting bracket, is pivotally supported by the first shaft to the lower portion of the hanging member Rutotomoni, an intermediate member upper is positioned to face the upper portion of the suspension member, while being rotatably supported by the second shaft to the top of the intermediate member, the pivotally supporting the suspension and member and said intermediate member a mounting portion for mounting the strain insulator device on both sides of one axis, respectively, and the result of the shear pins provided in the intermediate portion of the intermediate member and a vertical member is penetrated in the middle, the left and right tension insulator apparatus In the suspended tension device in which the shear pin is cut when an unbalanced tension is generated, a mounting portion for attaching the tension member of the vertical member includes a horizontal line L1 passing through the first axis, Above The absolute value of the difference between the catenary angles α1 and α2 of the tension insulators on the left and right with respect to the horizontal line L1 passing through the intersection of the second axis of the intermediate member, the shear pin and the vertical line L2 passing through the first axis. It has a crossing angle η of approximately ½, and is characterized by being provided at positions opposite to each other on the straight line L0 on which the side with the larger catenary angle becomes lower .
Further, the present invention is characterized in that a mounting portion of both tension insulators is further provided on the horizontal line L1.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. FIG. 1A is a front view of a vertical member 100 used in a suspended tension device according to an embodiment. Like the vertical member 6 shown in FIG. Is formed.
[0014]
Since the mounting bracket, the suspension member, and the intermediate member combined with the vertical member 100 are the same as those in FIGS. 3 and 4 described above, these members are omitted here. Therefore, hereinafter, when these members are necessary for the description, description will be made using the reference numerals of the conventional members as they are.
[0015]
Provided by which the support shaft hole 7 'in the upper end of the vertical member 100, as it can be used for pivotally supporting both intermediate members 4a, 4b, and a vertical member 100 supporting shaft 7 (corresponding to the second axis) In addition, a shear pin hole 10 ′ through which the shear pin 10 passes is provided at a substantially central position of the vertical member 100.
[0016]
In FIG. 1 (a), 9 'and 9' are attachment holes for the tension insulators 9 and 9 and are provided on both sides of the bottom of the vertical member 100 having a triangular shape. Then, these two mounting holes 9 ', 9' of the mounting holes 9 located right side 'is mounting holes 9 located on the left side' is provided on the lower position than.
[0017]
The positional relationship between the two mounting holes 9 'and 9' is determined by the catenary angles α1 and α2 of power transmission lines (not shown) connected to the mounting holes 9 'and 9'. That is, in the present invention, when the catenary angles of the left and right tension insulators are α1 and α2, the attachment holes 9 ′ and 9 ′ (attachment portions) for attaching the tension insulators 9 of the vertical member 6 are provided on the support shaft 5. A vertical line L2 passing through the horizontal line L1 passing through, the support shaft 7 of the intermediate members 4a, 4b, the shear pin 10, the suspension members 2a, 2b, and the support shaft 5 (corresponding to the first shaft). The crossing angle η satisfying the mathematical formula shown in FIG. 1B with respect to the horizontal line L1 is passed through the horizontal line L1, and the crossing point on the straight line L0 where the side with the larger catenary angle becomes lower is provided at positions opposite to each other. I made it.
In the above formula, α1 and α2 are catenary angles, the catenary angle below the horizontal line is a + (plus) value, and the catenary angle above the horizontal line is a-(minus) value. . Therefore, the absolute value of the difference between α1 and α2 in the case of FIG. 1A is larger than the absolute value of the difference between α1 and α2 in the case of FIG.
[0018]
This crossing angle η will be further described with reference to FIG. 6 described above. This crossing angle η indicates that the vertical member 6 hitting the vertical member 100 of the present invention is supported by the support shafts 8a, 8b (the mounting holes 9 ′, 9 of the present invention). ), The line connecting the support shaft 7 and the shear pin 10, that is, the longitudinal axis L2 of the intermediate members 4a and 4b is connected to the suspension member 2a. The angle is set equal to the longitudinal axis of 2b, that is, to coincide with the vertical line L3. Therefore, the angle β in FIG. 6 and the crossing angle η in FIG.
[0019]
When the crossing angle η is maintained as described above, the line L2 connecting the support shaft hole 7 'and the shear pin hole 10' of the vertical member 100 is a vertical axis that is the axial center of the suspension members 2a and 2b. Can coincide with line L3. Accordingly, the position of the shear pin 10 can be positioned on the vertical line L3 even if the catenary angles α1 and α2 of the left and right power transmission lines are different, and an unnecessary force acts on the shear pin 10 at all times. It can be prevented in advance.
[0020]
Incidentally, it may not completely match on position vertical line L3 of the shear pin 10, i.e., satisfies substantially the number expression shown in FIG. 1 (b), be neglected effects of unnecessary force to the shear pins 10 Can do. Therefore, it is possible to cope without increasing the types of shapes of the vertical members 100.
[0021]
As shown in FIG. 3, the vertical member 200 shown in FIG. 2 has a predetermined difference between the catenary angles α1 and α2 when the catenary angles α1 and α2 of the left and right transmission lines are substantially equal. A dual-purpose mold that can be applied is also shown. That is, 9 ″ and 9 ″ in FIG. 2 indicate mounting holes for the tension insulators 9 and 9 that are used when the catenary angles α1 and α2 of the left and right transmission lines substantially coincide with each other.
[0022]
【The invention's effect】
This onset Ming, a mounting bracket attached to the arm of the transmission line tower, a hanging member which is hung on the mounting bracket, while being rotatably supported by the first shaft to the lower portion of the hanging member, the upper suspension member strain insulator and the intermediate member at a position facing the upper part, while being rotatably supported by the second shaft to the top of the intermediate member, on both sides of the first shaft for supporting the suspension and member and said intermediate member a mounting portion for mounting the device respectively, and the result of the shear pins provided in the intermediate portion of the intermediate member and a vertical member is penetrated in the middle, when the unbalanced tension occurs in the left and right tension insulator apparatus In the suspended tension device in which the shear pin is cut, an attachment portion for attaching the tension insulator device of the vertical member includes a horizontal line L1 passing through the first axis, a second axis of the intermediate member, and the Sharepi And an intersection angle η that is approximately ½ of the absolute value of the difference between the catenary angles α1 and α2 of the tension insulators on the left and right with respect to the horizontal line L1 through the intersection of the vertical line L2 passing through the first axis. And because it is provided at a position opposite to the intersection point on the straight line L0 where the side with the larger catenary angle is lower, it is possible to prevent an unnecessary force from acting on the shear pin at all times. For this reason, it is possible to eliminate the possibility of hindering the original function of the shear pin in an emergency.
Moreover, when the attachment parts of both tension insulators are further provided on the horizontal line, they can also be used when the catenary angles are substantially equal.
[Brief description of the drawings]
FIG. 1 is a plan view of a vertical member used in a suspended tension device according to an embodiment of the present invention.
FIG. 2 is a plan view in which an upper part of a vertical member used in a suspended tension device according to another embodiment of the present invention is omitted.
FIG. 3 is a front view in which a part of the left side of a conventional suspended tension device is omitted.
4A is an enlarged front view of a partially cutaway portion of FIG. 3, and FIG. 4B is a right side view of FIG.
FIG. 5 is an explanatory diagram showing a state in which a shear pin is cut.
FIG. 6 is an explanatory diagram when the catenary angles of the left and right power transmission lines are different.
[Explanation of symbols]
1 mounting bracket 2a, 2b hanging members 4a, 4b intermediate member 6,100,200 vertical member 7 'supporting shaft hole 9 anti-clad insulator apparatus 9' preparative Tsukeana 10 Eapin <br/> 10 'Shea Eapin hole [alpha] 1, [alpha] 2 catenary angle η exchange difference angle

Claims (2)

A mounting bracket attached to the arm of the transmission line tower, facing the hanging member hung on the mounting bracket, while being rotatably supported by the first shaft to the lower portion of the hanging member, the upper portion of the upper said hanging member an intermediate member located in its conjunction is pivotally supported by the second shaft at the top of the intermediate member, the mounting portion for mounting the strain insulator device on either side of the first shaft for supporting the suspension and member and said intermediate member have respective and the it a shear pin provided on the intermediate portion of the intermediate member and a vertical member is penetrated in the middle, the shear pin is cut when the unbalanced tension occurs in the strain insulator apparatus of the right and left In the suspended tension device ,
An attachment portion for attaching the tension insulator device of the vertical member has an intersection of a horizontal line L1 passing through the first axis and a vertical line L2 passing through the second axis of the intermediate member, the shear pin, and the first axis. As described above, the horizontal line L1 has a crossing angle η that is approximately a half of the absolute value of the difference between the catenary angles α1 and α2 of the left and right tension insulators, and the larger side of the catenary angle is lower on the straight line L0. A suspended tension device characterized by being provided at a position opposite to the intersection . The attachment portions of the strain insulator device are also provided on the further horizontal lines L1 suspension shaped tension apparatus according to claim 1, wherein.

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