JP5424112B2 - Difficult snow ring - Google Patents

Description

  The present invention relates to a hard snow ring, and more particularly to a hard snow ring used as a hard snow cover for power transmission lines such as overhead power lines and ground lines.

  Conventionally, a snowfall ring has been used as a snowfall countermeasure in snowy areas to prevent damage to the transmission line due to vibration due to weight or wind due to snow on an overhead power line or ground line. In particular, a rib that protrudes from the inner peripheral surface of the ring shape and adjusts the inner diameter so as to be able to be wound and attached without loosening even if there is a slight difference in the outer diameter of the transmission line is integrally formed. A difficult snow ring is widely known (for example, refer to Patent Document 1 below).

One embodiment of a conventional snowfall ring used for the above-described power transmission line will be described with reference to FIGS. FIG. 5 is an external perspective view showing an embodiment of a conventional difficult snow ring 4. FIG. 6 is a diagram showing the configuration of the difficult snow ring 4 shown in FIG. 5, in which FIG. 6 (a) shows a front view and FIG. 6 (b) shows a longitudinal sectional view. FIG. 7 is a view showing a state in which the hard snow ring 4 shown in FIG. FIG. 8 is a diagram showing an operation of attaching the difficult snow ring 4 to the power transmission line 1 shown in FIG. 7, where FIG. 8 (a) shows a state before installation, and FIG. 8 (c) shows after operation. Each state is shown.
As shown in FIG. 5, one embodiment of a conventional snow-rescue ring 4 has an openable / detachable end portion 31 that is attached to a conductive wire 1 (see FIG. 7) such as an overhead power transmission line and a ground wire. The open end 31 is formed in an openable / closable annular body 30. The open end 31 has a locking projection 31a on one open end and a fitting groove 31b for fitting and locking the locking projection 31a on the other open end. Each is formed. In addition, a hinge portion 32 having a corrugated cross section is provided at a predetermined position (an opposed position of the open end 31 in FIG. 5) of the circular cross section of the annular body 30 and is integrally formed on the inner surface of the annular body 30. Ribs 33 are provided to project so that the thickness increases toward the center.

Here, the rib 33 is a rib that extends along the inner peripheral surface of the annular body 30 and protrudes in a protruding shape toward the center of the ring shape, and the material thereof is rubber or a plastic having rubber elasticity. As shown in FIG. 6 (a), the inner circumferential surface of the annular body 30 is provided so as to protrude into a pair of left and right in a semicircular shape. Further, as shown in FIG. 5, a plurality of ribs 33 are provided at a predetermined interval orthogonal to the central rib 33a extending long along the annular inner peripheral surface and orthogonal to the central rib 33a. And orthogonal ribs 33b. The center rib 33a prevents sliding in the extending direction of the power transmission line 1 (see FIG. 7), and the orthogonal rib 33b prevents the annular body 30 from rotating around the power transmission line 1. Here, the rib 33 and the annular body 30 can be formed of, for example, addition-type thermosetting rubber for injection molding, specifically, silicone rubber or the like.
Further, the protruding thickness (height) of the rib 33 is fitted to the open end 31 (the locking projection 31a and the fitting groove 31b shown in FIG. 1) of the annular body 30 shown in FIG. 6 (a). When formed into a ring shape, the ring-shaped inner diameter G including the rib 33 shown in FIG. 6B is designed to be slightly smaller than the outer diameter F of the power transmission line 1 shown in FIG.
That is, the rib 33 has a case where the outer diameter F of the power transmission line 1 has a certain (somewhat) variation in the standard outer diameter, or the outer diameter F of each power transmission line varies depending on the manufacturer of the power transmission line 1. Is also provided so that it can be adjusted by the small inner diameter G of the annular body 30 shown in FIG.

More specifically, as shown in FIG. 8A, the conventional difficult-to-snow ring 4 is configured such that the engagement between the locking projection 31a and the fitting groove 31b of the annular body 30 is removed and the outer half is outward from the center. In an open state, the ring body 30 is closed and mounted so as to be wound around the outer diameter F in the vicinity of the power transmission line 1.
At this time, for example, the annular body 30 is fitted by sandwiching and fitting the open end 31 between the locking projection 31a and the fitting groove 31b using a tool such as a dedicated pliers (not shown). As shown in b), due to the fitting force H with the open end 31 closed (fitted), the strands of the power transmission line 1 enter (bite into) the ribs 33 on the inner periphery of the annular body 30. Since it has the effect which fills the space | gap of the twist line of the power transmission line 1 and the annular body 30, the power transmission line 1 can be hold | gripped effectively.
Then, on the power transmission line 1, for example, by installing a plurality of the hard snow ring 4 at intervals of 150 mm to 1100 mm, the construction work of the hard snow structure is completed.

  As described above, the conventional difficult snow ring 4 can be satisfactorily filled with the rib 33 protruding in a protruding shape on the inner surface of the annular body 30 to fill the gap between the power transmission line 1 and the annular body 30. The power transmission line 1 was formed so as to be gripped.

JP 2006-311629 A

However, in the embodiment of the conventional hard snow ring 4, as shown in FIG. 8 (b), it has a hinge portion 32 that is a buffer portion having a cross-sectional wave shape on the circular arc of the annular body 30. The hinge portion 32 is designed to follow the variation (variation) in the outer diameter F of the transmission line 1 by expanding and contracting in the direction of arrow I shown in FIG. However, there is a problem that the expansion and contraction of the hinge portion 32 does not appear as an effective effect due to the structure in which the rib 33 enters and fixes between the strands of the power transmission line 1 as described above.
As a result, in the conventional difficult snow ring 4, for example, the hinge part 32 that does not exhibit the expansion / contraction effect described above extends due to a change with time, and the gripping force of the annular body 30 or the difficult snow attachment effect decreases, or the transmission line 1 and the annular body. There was a possibility that an air gap was generated between 30 and rain, and corona discharge and noise were generated and the environment was deteriorated.

  The present invention has been made in view of the above points, and an object of the present invention is to transmit a force evenly to the hinge portion with a simple structure, so that it can be attached to a power transmission line without loosening, and there is no decrease in gripping force due to changes over time. An object of the present invention is to provide a difficult snow ring that can prevent discharge and noise.

In order to solve the above-mentioned problems, the present invention is formed in an openable / closable annular body having an openable / detachable open end that is attached to a power transmission line such as an overhead power transmission line and a ground line, and the open end is opened. A locking projection for engaging and locking the locking projection is formed at one open end and a locking groove for engaging and locking the locking projection at the other open end. And a difficult snow ring including a rib integrally formed on the inner surface of the annular body and projecting so that the thickness increases toward the center,
(1): a pair of corrugated hinge portions arranged diagonally on the left and right of the center line connecting the center point of the arc-shaped cross section and the open end, and a pair of hinge portions on the arc And a rib that is integrally formed only on the inner surface of the other side different from the open end side.

  Here, (2): the annular body has a pair of hinges centered on a center line extending from the center point to both sides perpendicular to the center line from the center point of the arc-shaped cross section to the open end. A pair of 1/4 annular bodies that are arranged in a circular arc shape from both of the pair of hinge portions to the open end and can be opened and closed, and a pair of hinge portions. It is preferable to comprise a half annular body in which the ribs are integrally formed by connecting them in a semicircular arc shape.

It is difficult to install multiple snow-reducing rings at regular intervals in response to fluctuations in the outer diameter of transmission lines such as overhead transmission lines and ground lines that are installed on a support. A construction method for a snow accretion structure,
A difficult snow landing method for a transmission line, wherein the hard snow landing structure uses the hard snow ring of (1) or (2).

As described above, according to the difficult snow ring according to the present invention, a rib is not provided on a substantially half arc on one side from a pair of hinges arranged on an annular body, and a structure in which the expansion and contraction effect of the hinges can be easily obtained is formed. Therefore, when attaching to the power transmission line, the force is evenly transmitted to the annular body and the hinge portion can be sufficiently extended, and the outer periphery of the power transmission line can be gripped satisfactorily.
In addition, according to the difficult snow ring according to the present invention, the pair of hinge portions described above can be extended so that the power transmission line can be satisfactorily held inside the annular body. There is no reduction, there is no gap between the transmission line and the annular body, no corona discharge or noise is generated, and environmental degradation can be suppressed.

The external appearance perspective view which shows one Embodiment of the difficult snow accretion ring by this invention. The figure which shows the state which assembled the difficult snow ring shown in FIG. The figure which shows the detailed structure of the difficult snow ring shown in FIG. The figure which shows the state which mounted | wore the power transmission line with the difficult snow ring shown in FIG. The external appearance perspective view which shows one Embodiment of the conventional difficult snow accretion ring. The figure which shows the structure of the difficult snow ring shown in FIG. The figure which shows the state which mounted | wore the power transmission line with the difficult snow ring shown in FIG. The figure which shows the operation | movement which mounts a difficult snow ring on the power transmission line shown in FIG.

Next, an embodiment of a difficult snow ring according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an external perspective view showing an embodiment of a difficult snow ring 2 according to the present invention. 2 is a diagram showing a detailed structure of the hard-to-snow ring 2 shown in FIG. 1, FIG. 2 (a) is a front view, and FIG. 2 (b) is a longitudinal sectional view. . FIG. 3 is a diagram showing an operation of attaching the difficult snow ring 2 shown in FIG. 1 to the transmission line 1. FIG. 3 (a) shows a state before installation, and FIG. 3 (c) shows after operation. Each state is shown. FIG. 4 is a diagram showing a state where the hard snow ring 2 shown in FIG. The power transmission line 1 shown in FIGS. 3 and 4 is the same component as the power transmission line 1 shown in FIG.
As shown in FIG. 1, one embodiment of the difficult snow ring 2 according to the present invention is attached to a power transmission line 1 (see FIG. 4) such as an overhead power transmission line and a ground line, as in the prior art shown in FIG. 5. An openable and closable annular body 10 having an openable and detachable open end 11 is formed. The open end 11 is opened at one open end with a lock projection 11a and the other open end with a lock projection 11a. A fitting groove 11b to be fitted and locked is formed, a hinge portion 12 having a corrugated cross section is provided at a predetermined position of the circular cross section of the annular body 10, and is integrally formed on the inner surface of the annular body 10. Ribs 13 are provided so as to protrude so that the thickness increases toward the center.
Further, unlike the prior art shown in FIG. 5, the difficult snow ring according to the present invention has an annular body 10 having a center point A and an open end 11 of an arc-shaped cross section as shown in FIG. A pair of diagonally arranged cross sections on the left and right sides of the center line B connecting the two and the hinge portions 12a and 12b having corrugations, and the open end portion 11 side with respect to the pair of hinge portions 12a and 12b on the arc And a rib 13 formed integrally only on the inner surface of the other side.
That is, this embodiment has the same structure in that it has the open end portion 11, the hinge portion 12, and the rib 13 of the difficult snow ring 2, as in the prior art shown in FIG. A pair of hinge portions 12 are disposed on opposite sides of the arc shown in FIG. 2, and ribs extending from the pair of hinge portions 12a and 12b to one arc on the open end 11 side are eliminated. Thus, the rib 13 is formed only on the other arc (semicircle inner circumference) different from the open end 11 side.

Here, the annular body 10 is made of rubber, plastic or the like, as in the prior art shown in FIG. As this plastic, for example, various resins that are already known as materials for a snow-resistant ring such as polyether ether ketone, polyphenylene sulfide, or polycarbonate can be used.
Further, as shown in FIG. 2 (a), the annular body 10 has a pair of hinge portions 12a and 12b arranged on an arc unlike the prior art shown in FIG. 5, and the pair of hinge portions 12a and 12b. For example, with respect to the center line B from the center point A to the open end 11 of the arc-shaped cross section, the center line B is orthogonal to the center line A and extends on both sides from the center point A. It is formed in the positional relationship to arrange. That is, in the annular body 10, the open end 11 and the pair of hinge portions 12a and 12b are respectively arranged on the arc at intervals corresponding to four arcuate cross sections by the center lines B and C orthogonal to the cross. ing. Thereby, as shown in FIG. 2A and FIG. 3A, the annular body 10 extends from both the pair of hinge portions 12a and 12b to the locking projection 11a and the open end portion 11 of the fitting groove 11b. A pair of openable and closable 1/4 annular bodies 10a and 10b extending in an arc shape, and a pair of hinge portions 12a and 12b extending in a semicircular arc shape in the opposite direction different from the open end 11 side, respectively. The half ring body 10c which connects and integrally forms the rib 13 is formed.
Here, the annular body 10 is not limited to being divided into four equal parts by the center lines B and C, and is divided into three equal parts from the center point A according to the outer diameter shape of the power transmission line 1, for example. / 3 It is also possible to form a structure having three annular bodies. In short, in the present embodiment, the power transmission line 1 is formed so as to be satisfactorily gripped by appropriately changing the positions of the pair of hinge portions 12a, 12b on the arc according to the outer diameter shape of the power transmission line 1. .

On the other hand, the rib 13 is formed integrally with the inner peripheral surface of the annular body 10 as in the prior art shown in FIG. 5, and extends along the inner peripheral surface to project toward the center of the ring shape. The rib is made of the same rubber as the annular body 10 or a plastic having rubber elasticity.
Unlike the prior art shown in FIG. 5, the rib 13 extends in a semicircular shape only on the inner circumference of the half annular body 10 c different from the open end 11 side of the annular body 10 shown in FIG. 2. It is formed to protrude. That is, the rib 13 according to the present invention is not formed by projecting two ribs on the entire inner circumference of the annular body like the prior art rib shown in FIG. 5, but a part of the inner circumference of the half annular body 10c. It is formed so as to protrude only half a circle.
In addition, as shown in FIG. 1, the rib 13 has a central rib 13a that extends long along an annular inner peripheral surface similar to the prior art, and a predetermined interval perpendicular to the central rib 13a in a cross shape. And a plurality of short orthogonal ribs 13b. The central rib 13a prevents sliding in the extending direction of the power transmission line 1 (see FIG. 4), and the orthogonal rib 13b prevents the annular pair 10 from rotating around the power transmission line 1.
Then, the protruding thickness (height) of the rib 13 is the open end 11 of the annular body 10 (the locking projection 11a and the fitting groove 11b shown in FIG. 1), as shown in FIG. 2 to form a ring shape, the ring-shaped inner diameter D including the ribs 13 is slightly larger than the outer diameter F of the transmission line 1 (see FIG. 4), as shown in FIG. Designed to be small.
That is, the rib 13 has a case where the outer diameter F of the power transmission line 1 originally has a certain (somewhat) variation in the standard outer diameter, or the outer diameter F of each power transmission line varies depending on the manufacturer of the power transmission line 1. Is also provided so that it can be adjusted by the small inner diameter D of the annular body 10.

The operation of mounting the power transmission line 1 using the difficult snow ring 2 of the present invention formed as described above (or the difficult snow landing method) will be described in detail with reference to FIGS.
As shown in FIG. 3A, the difficult snow ring 2 according to the present invention has a pair of 1/4 each from the center to the outside by removing the engagement between the locking projection 11 a and the fitting groove 11 b of the annular body 10. In a state where the annular bodies 10a and 10b are opened (in the case of double doors), the power transmission line 1 is brought into contact with the inner rib 13 of the 1/2 annular body 10c and is then seated, and then the pair of 1/4 annular bodies described above. 10a and 10b are closed so that they are wound around the outer diameter F of the power transmission line 1. As described above, the annular body 10 is configured such that the transmission line 1 is seated on the 1/2 annular body 10c, and is closed and pressed so as to cover the pair of 1/4 annular bodies 10a and 10b without the rib 13 from the left and right. Therefore, as compared with the conventional annular body shown in FIG. 8B, it is possible to transmit evenly to the hinge portions 12a and 12b without absorbing the force of the entire outer diameter of the transmission line 1.
Specifically, the annular body 10 is formed by, for example, using a dedicated pliers (not shown) to close the pair of quarter annular bodies 10a and 10b, respectively, so that the locking protrusion 11a and the fitting groove 11b of the open end 11 are formed. As shown in FIG. 3B, the power transmission line 1 is effectively gripped by the fitting force H that closes (fits) the open end 11 by sandwiching and fitting. At this time, when the open end 11 is closed, the outer diameter F of the power transmission line 1 is directly increased from the inner circumference of the pair of quarter annular bodies 10a and 10b that do not have the rib 13 shown in FIG. A force is applied, and the power transmission line 1 is pressed toward the half annular body 10c. Thereby, the strand of the power transmission line 1 enters (cuts into) the rib 13 provided on the inner periphery of the 1/2 annular body 10 c, and the rib 13 fills the gap between the twist line of the transmission line 1 and the annular body 10. By having, one side of the outer periphery half of the power transmission line 1 is effectively gripped. Further, while the power transmission line 1 enters the rib 13 of the ½ annular body 10c, on the contrary, a force repelling against the pressing of the pair of ¼ annular bodies 10a and 10b is applied to the ¼ annular body 10a. 10b is added to the inner circumference. Accordingly, in the annular body 10, the pair of ¼ annular bodies 10 a and 10 b illustrated in FIG. 3B is pushed up toward the outer side of the open end portion 11, and as a result, the outer diameter F of the transmission line 1. Following the variation (variation), a force is applied in the direction in which the pair of hinge portions 12a and 12b are evenly extended (the direction of arrow E shown in FIG. 3B).
Therefore, as shown in FIG. 4, when the annular body 10 is attached to the power transmission line 1, the outer diameter F of the power transmission line 1 is obtained by fitting the engaging protrusion 11 a of the open end 11 and the fitting groove 11 b. The force is transmitted uniformly from the entire circumference to the hinge portions 12a and 12b, so that the attachment can be performed satisfactorily.
Then, on the power transmission line 1 shown in FIG. 4, for example, by installing a plurality of the hard snow ring 2 at an interval of 150 mm to 1100 mm, the construction work of the hard snow structure is completed.

According to such an embodiment of the difficult snow ring according to the present invention, the ribs are not provided on the arcs that are substantially half on one side from the hinges 12a, 12b arranged in a pair on the annular body 10, and the hinges 12a, 12b extend and contract. Since the structure is easy to obtain the effect, when the power cable 1 is attached to the power transmission line 1, the force can be evenly transmitted to the annular body 10 to sufficiently extend the hinge portions 12 a and 12 b, and the outer diameter F of the power transmission line 1 can be reduced. It can be gripped well.
Further, according to one embodiment of the difficult snow ring according to the present invention, the power transmission line 1 can be satisfactorily held inside the annular body 10 while extending the pair of hinge portions 12a, 12b described above. The gripping force and the effect of difficult snow accretion are not reduced, there is no gap between the power transmission line 1 and the annular body 10, and corona discharge and noise are not generated, so that deterioration of the environment can be suppressed.

As mentioned above, although embodiment of the difficult snow ring according to this invention was described in detail, this invention is not limited to embodiment mentioned above, It can change in the range which does not deviate from the summary.
For example, although the embodiment in which only one rib is extended along the inner periphery of the ½ annular body has been described, the present invention is not limited to this, and the width of the inner periphery of the ½ annular body is not limited to this. It is also possible to extend a plurality of protrusions.
Further, the rib is not limited to being provided in a pair with the annular body. For example, a soft sheet to be attached to the inner periphery of the 1/2 annular body is provided, and an integral protrusion is projected from the sheet. It is also possible (see JP 2002-369362 A).

1 Transmission line
2 Difficult snow ring 10 Ring body 10a 1/4 ring body 10b 1/4 ring body 10c 1/2 ring body 11 Open end 11a Locking projection 11b Fitting groove 12a, 12b Hinge part 13 Rib 13a Center rib 13b Right angle rib

Claims (2)

Formed in an openable / closable annular body having an openable and detachable open end portion to be attached to a power transmission line such as an overhead power transmission line and a ground wire, and a locking projection and the other open end of the open end portion are opened. A fitting groove for fitting and locking the locking projection is formed at the open end, and a hinge portion having a corrugated cross section is provided at a predetermined position of the circular arc cross section of the annular body, and the inner surface of the annular body In the difficult snow ring having ribs that are integrally formed with and protruded so that the wall thickness increases toward the center,
A pair of the corrugated hinges arranged diagonally on the left and right of the center line connecting the center point of the arc-shaped cross section and the open end, and the pair of hinges on the arc And a rib integrally formed only on the inner surface on the other side different from the open end side. The difficult snow ring according to claim 1,
The annular body is an arc centered on a center line in which the pair of hinge portions are orthogonal to a center line from the center point of the arc-shaped cross section to the open end and extend from the center point to both sides. A pair of ¼ annular bodies which are in a positional relationship arranged on each of them and extend in an arc shape from both of the pair of hinge parts to the open end part and can be opened and closed; and the pair of hinge parts A difficult-to-snow ring, comprising: a half-circular body connected in a semicircular arc shape and integrally forming the rib.

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