JPH0924754A - Tension balancer for aerial wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the good deforming property of coil springs in the extending and contracting movement of a tension balancer interposing coil springs concentrically between an outer tubular member and an inner member. SOLUTION: While an outside inner tube 2, an inside inner tube 3, and a rod 4 are housed displaceable concentrically and in the axial direction, coil springs 5, 6, and 7 are interposed between the inner and the outer peripheral surfaces of the members, so as to form a triple structure, short coil springs 5a, 5b, 6a, 6b, 7a, and 7b are formed by combining the coil springs 5, 6, and 7 in series each other, and the winding directions (right hand winding and left hand winding) of neighboring short coil springs are combined each other to be the different winding directions. As a result, a deflecting load by the buckling when the coil springs are combined in series can be avoid as low as possible, and the function of the tension balancer is never failed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire tension balancer, and more particularly to an overhead wire tension balancer used for equipment for holding the tension of electric power lines.

[0002]

2. Description of the Related Art Overhead wires, especially electric wires (suspension overhead wires, auxiliary suspension overhead wires, trolley wires), expand and contract due to temperature changes, and elastic elongation due to creep and trolley wire wear, and tilting of the support over time. Since the sag tension is affected by such factors, it is necessary to keep the tension of the power line constant. Further, it is desirable that the adjustment be automatically performed to be maintenance-free.

[0003] Conventionally, there are known a pulley type in which a tension is applied by a weight using a pulley and a spring type in which a coil spring is used as an automatic tension adjusting device capable of constantly maintaining the above tension. However, although the pulley type is excellent in the performance of keeping the tension constant, there are problems that the installation work becomes complicated and that periodic maintenance is required to prevent deterioration of the wire.

In the spring type, the apparatus can be made compact and lightweight and maintenance-free can be achieved, but it is difficult to make the tension constant because it depends on the spring constant. Therefore, for example, as disclosed in Japanese Utility Model Publication No. 39-19536, a plurality of coil springs are used, and in order to make the size more compact, the springs are concentrically combined in a multiple and concentric connection with each other and connected in series. A balancer is possible.

FIG. 4 shows an example of a tension balancer using the above structure. In FIG. 4, a cylindrical casing 1
The outer middle cylinder 2, the inner middle cylinder 3 and the rod 4 are concentrically received inside and axially movable relative to each other. Further, large, medium and small diameter coil springs 5, 6, 7 are respectively provided between the casing 1 and the outer middle cylinder 2, between the outer middle cylinder 2 and the inner middle cylinder 3, and between the inner middle cylinder 3 and the rod 4. Are concentrically interposed. Each of the coil springs 5 to 7 has one end in the axial direction locked to each of the inward flange portions 1a, 2a and 3a fixed to the inner peripheral surface of each outer member, and the other ends thereof to the inner member. The outward flange portions 2b, 3b, 4b fixed to the outer peripheral surface are locked.

Outer middle cylinder 2, inner middle cylinder 3 and rod 4
Is received in the casing 1 when assembled,
It can be projected to the right in the figure. The casing 1 has a hook portion 1 fixed to an end plate 1b at the rear end thereof.
5 is connected to the support column 16 via a support rope 18 connected to a perforated bracket 17 fixedly provided on the upper surface of the casing 1. The end of the wire 20 is coupled to the hook 19 attached to the projecting end of the rod 4, and the train line is pulled through the wire 20. In order to inspect whether the amount of expansion and contraction due to temperature change is appropriate, for example, at the protruding end of the rod 4, after extending radially outward from the rod 4 as shown by the phantom line in FIG. A scale plate 21 made of an L-shaped member is provided on the outer peripheral surface of the rod 1 along the axial direction so that the amount of protrusion of the rod 4 with respect to the casing 1 can be visually checked.

In the tension balancer thus constructed, the coil springs 5 to 7 are compressed and deformed to some extent under the standard installation conditions, and the outer middle cylinder 2 as shown in FIG. 4, for example.
Also, the inner middle cylinder 3 and the rod 4 are installed in a state of being protruded by a stroke length reaching an almost intermediate position of a use stroke range. Therefore, for example, when the temperature drops and the trolley wire contracts, the rod 4, the inner middle cylinder 3 and the outer middle cylinder 2 further protrude against the repulsive force of the coil springs 5 to 7, and the temperature rises and When it expands, the rod 4, the inner middle cylinder 3, and the outer middle cylinder 2 are retracted into the casing 1 by the elastic restoring force of the coil springs 5 to 7, so that the displacement due to the expansion and contraction of the electric power line can be absorbed.

In each of the coil springs 5 to 7 having the above-described structure, when each coil spring is one long coil spring, the axis is easily bent at the time of compression, and the axial middle portion of the coil spring is an outer member or an inner member. There is a risk of sliding contact with the inner and outer peripheral surfaces of the. Therefore, it is possible to combine a plurality of short coil springs in series to form one long coil spring as a whole. Further, by doing so, it is possible to obtain the effect that the tension change rate of the overhead wire can be arbitrarily adjusted by changing the number of series of short coil springs.

However, an eccentric load is generated between the adjacent short coil springs by the buckling, and it is difficult to avoid the buckling even if the shape of the single body is made highly accurate.

[0010]

SUMMARY OF THE INVENTION In view of the problems of the prior art as described above, the main object of the present invention is to provide a spring type in which a coil spring is concentrically interposed between an outer cylindrical member and an inner member. It is an object of the present invention to provide an overhead wire tension balancer that can secure good deformation characteristics of a coil spring during expansion and contraction of the tension balancer.

[0011]

According to the present invention, there is provided an overhead wire tension balancer for maintaining a constant tension of an overhead wire installed in the air, wherein the overhead wire tension balancer is an outer cylinder. -Shaped member, an inner member that is concentrically received in the outer tubular member so as to be retractable in the axial direction, a coil spring concentrically interposed between the both members, and an axis of the coil spring The coil spring has a plurality of outward and inward flange portions provided at positions opposite to the axial direction of the inner and outer peripheral surfaces of the respective members facing each other so as to lock the respective ends in the direction. Since the short coil springs are combined in series and the winding directions of adjacent ones are alternated, the rate of change in tension of the overhead wire can be arbitrarily adjusted by changing the number of series of short coil springs. Next to By combining in the staggered winding direction between Umono, the eccentric load due to buckling when combining coil springs in series can be avoided as much as possible.

[0012]

1 is a side sectional view showing an overhead wire tension balancer to which the present invention is applied, and is installed and used in the same manner as FIG. 2 shown in the conventional example. The same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present embodiment, as in the conventional example, the outer casing 2 serving as the inner member and the outer tubular member, and the inner member and the outer tubular member in the same manner are provided in the cylindrical casing 1 serving as the outer tubular member. While receiving the inner middle cylinder 3 and the rod 4 as the inner member which are concentrically and displaceably in the axial direction,
It has a triple structure in which three types of large, medium and small diameter coil springs 5, 6 and 7 are concentrically interposed between the inner and outer peripheral surfaces of the respective members from the outer side so that the spring constant increases. The rod 4 is formed in a cylindrical shape for weight reduction.

Each of the coil springs 5, 6, 7 has an inward and outward flange portion 1a, 2a, 3a, 2 serving as a spring seat for locking both ends of the coil springs 5, 6, 7 in the axial direction.
Each pair of b, 3b, and 4b is interposed and assembled in a state in which a predetermined initial load is applied.

Each coil spring 5, 6, 7 according to the present invention
Is configured by combining a plurality of short coil springs each having a short axial length in series, and in the present embodiment, each of the two short coil springs 5a, 5b, 6a, 6b, 7a.
・ 7b are combined in series. By doing so, the rate of change in tension of the overhead wire can be arbitrarily adjusted by changing the number of series of each short coil spring, which is effective as a countermeasure against the flow of the overhead wire.

In the coil spring 5, the short coil springs 5a and 5b adjacent to each other are combined in series as described above, and the winding directions (right-handed and left-handed) of adjacent ones are staggered. Has been done. Other short coil spring 6
Similarly, a, 6b, 7a and 7b are also alternately combined with right-handed and left-handed windings. By doing so, the eccentric load due to the buckling when the coil springs are combined in series is avoided as much as possible. be able to.

Further, each short coil spring 5a, 5b, 6a,
It is recommended that 6b, 7a, and 7b be wound in such a manner as to avoid integer winding in which both ends of the coil ends are aligned. By doing so, eccentric load can be avoided as much as possible. In addition,
The material for the coil springs 5-7 has a tensile strength of 150 kg / mm ²
Since the above high tensile strength steel is applied, the length can be reduced by 30 to 40% and the weight can be reduced by 40 to 50% as compared with the conventional spring steel. Further, aluminum plating is used for the surface treatment to enhance salt damage resistance.

The protruding end of the rod 4 on the right side of the drawing is shown in FIG.
2, a cylindrical stopper 9 fitted to the outer peripheral surface of the protruding end of the rod 4 is screwed to the rod 4 together with an end plate 10 that supports the hook 19. An annular member 11 having a rectangular cross section is rotatably fitted on the outer peripheral surface of the stopper 9, and a part of the outer peripheral surface of the annular member 11 extends radially outward and beyond the outer peripheral surface of the casing 1. A supporting arm 12 that projects is fixed, and a scale plate 8 that extends in the axial direction along the outer peripheral surface of the casing 1 is fixed to the extending end of the supporting arm 12. The scale plate 8 is marked with a scale indicating the displacement of the rod 4 with respect to the casing 1 in the axial direction.

An outer circumferential groove 9a is formed on the outer peripheral surface of the stopper 9 over the entire circumference thereof, and an inner circumferential surface of the annular member 11 corresponding to the outer circumferential groove 9a is formed on the inner peripheral surface thereof. The directional groove 11a is formed. These circumferential grooves 9a
Each of 11a has a substantially half-moon-shaped cross section.
By receiving the substantially annular C-shaped ring 13 between the circumferential grooves 9a and 11a, the C-shaped ring 13 is retained in the axial direction with respect to the stopper 9 via the C-shaped ring 13 and the rotation of the axial line is prevented. An annular member 11 is rotatably supported by the.

That is, the C-shaped ring 13 elastically engages with the inward circumferential groove 11a of the annular member 11 radially outward in the natural state, and in that state the C-shaped ring 1
A part of the inner diameter side of 3 can be inserted into the outward circumferential groove 9 a of the stopper 9. The outward circumferential groove 9a of the stopper 9 is deeply formed so that it can be completely buried when the C-shaped ring 13 is contracted. At the time of assembling, the C-shaped ring 13 is fitted in the outward circumferential groove 9a, and the annular member 11 is fitted on the outer peripheral surface of the stopper 9 until the circumferential grooves 9a and 11a face each other. 11 is displaced in the axial direction, but the C-shaped ring 13 can be buried in the outward circumferential groove 9a, so that the C-shaped ring 13
The inner peripheral edge of the annular member 11 can be prevented from interfering with each other. When both circumferential grooves 9a and 11a face each other, the C-shaped ring 13 elastically enters the inward circumferential groove 11a of the annular member 11, and the stopper and the annular member 11 are inserted via the C-shaped ring 13. Are engaged with each other in the axial direction, and the annular member 1 is rotatably attached to the stopper 9 about the axis.
1 is supported.

Further, when the stroke length of the rod 4 is long, the total length of the scale plate 8 also becomes long and there is a possibility that the scale plate 8 may be tilted downward due to its own weight. However, in the present embodiment, the weight is reduced while ensuring the strength. In addition, the scale plate 8 is formed by bending a thin plate into a flat U-shaped cross section as shown in FIG. Further, when the stroke of the rod 4 extends beyond the design allowable value for some reason, the casing 1 is moved to the scale plate 8
It is possible that the tip of the scale may come off, but the scale plate 8
When the rod 4 returns, the inclined guide portion 8a is provided to prevent the interference between the axial end portion of the casing 1 and the tip end of the scale plate 8 when the rod 4 is once removed. The scale plate 8 of FIG.

When the scale plate is fixed to the rod 4, since the overhead wire normally has a stranded wire structure, twisting occurs at the time of expansion and contraction. Therefore, the scale plate rotates together with the rod 4 and is lowered at the time of maintenance and inspection. Even when trying to check the stroke from, there was the inconvenience that it was difficult to see the scale plate. However, in the present embodiment, as described above, the scale plate 8 is rotatably attached to the rod 4, and even if the rod 4 rotates in accordance with the expansion and contraction of the overhead wire, the scale plate 8 will not move. Since it is always positioned below due to its own weight, it is easy to check the scale from below. In this embodiment,
Since the scale plate guide 14 is fixedly installed in the casing 1, the scale plate 8 is positioned downward even when the sliding contact resistance between the rod 4 and the annular member 11 increases and the annular member 11 becomes difficult to rotate. Can be made.

In the tension balancer thus constructed, the conventional balancer shown in FIG.
Similarly, the outer middle cylinder 2, the inner middle cylinder 3, and the rod 4 are installed in a state of protruding by a predetermined amount. In addition, the casing 1 is filled with grease for smooth sliding of the outer middle cylinder 2, the inner middle cylinder 3 and the rod 4.

In this tension balancer, the tension is automatically adjusted by simply installing it in series on the overhead line, so that maintenance can be made free, and the number of maintenance steps can be greatly reduced. Moreover, the allowable range of the rate of change in tension can be narrowed, and the present invention can be sufficiently applied to, for example, a trolley wire of 800 m, which has been difficult with a conventional spring tension balancer. Further, since the installation space is small, it is not necessary to secure a weight space in a heavy snow section, and space saving can be improved. In addition, having a stroke that is equal to or greater than the amount of expansion and contraction of the effective overhead wire length is effective for displacement of the overhead wire such as creep and Joule heat. Further, the structure based on a metal material can be used, and the function of the tension balancer can be exerted regardless of the outside temperature.

In the above-mentioned embodiment, an example in which the coil spring has a triple structure has been shown. However, the multiple structure of the coil spring is not limited to a triple structure, but may be a double structure as shown in FIG. May be. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The tension balancer of the second embodiment has a double structure in which the coil springs 6 and 7 of the medium and small diameters of the first embodiment are concentrically interposed so that the spring constant decreases from the outside in order. It is a structure. The spring constants of the coil springs 6 and 7 can be arbitrarily determined, and the outer coil springs 6
Is interposed in a predetermined compressed state between the inward flange portion 1a of the casing 1 and the outward flange portion 3b of the inner middle cylinder 3, and the inner coil spring 7 is interposed in the same manner as in the above embodiment. . In the tension balancer configured in this way, there is only a difference in the double and triple structure of the coil spring, and the action and effect are the same as those in the above-mentioned embodiment.

[0026]

As described above, according to the present invention, since a plurality of short coil springs are combined in series to form a coil spring, the rate of change in tension of the overhead wire can be changed by changing the number of short coil springs in series. In addition to being compatible with,
The eccentric load due to the buckling when the coil springs are combined in series can be avoided as much as possible, and the function of the tension balancer is not impaired.

[Brief description of drawings]

FIG. 1 is a side sectional view of a tension balancer to which the present invention is applied.

FIG. 2 is an exploded perspective view of a main part of the scale structure of the tension balancer.

FIG. 3 is a view similar to FIG. 1 showing a second embodiment.

FIG. 4 is a side sectional view showing a usage state of a conventional tension balancer.

[Explanation of symbols]

 1 Casing 2 Outer Middle Cylinder 3 Inner Middle Cylinder 4 Rod 1a ・ 2a ・ 3a Inward Flange 2b ・ 3b ・ 4b Outward Flange 5 Large Diameter Coil Spring 6 Medium Diameter Coil Spring 7 Small Diameter Coil Spring 8 Scale Plate 9 End Plate 9a Outside Directional circumferential groove 10 End plate 11 Annular member 11a Inward circumferential groove 12 Support arm 13 C-shaped ring 14 Scale plate guide 15 Hook part 16 Strut 17 Perforated bracket 18 Support rope 19 Hook 20 Wire 21 Scale plate

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masaaki Yamaguchi 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Within East Japan Railway Company (72) Inventor Masaharu Miura 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Within East Japan Railway Company (72) Inventor Toshi Togashi 2-12 Takaidanaka, Higashi-Osaka City, Osaka Prefecture Within the electric company (72) Inventor Michio Nishio 2-12 Takaidanaka, East Osaka City, Osaka Incorporated company in the electrical industry (72) Inventor Shoji Imada 2-12 Takaidanaka, Higashi-Osaka City, Osaka Prefecture Incorporated in the electrical industry (72) 3-10 Fukuura, Kanazawa-ku, Yokohama, Kanagawa Japan Within Harajuku Co., Ltd. (72) Inventor Yoshinori Suzuki 3-10 Fukuura, Kanazawa-ku, Yokohama, Kanagawa Prefecture

Claims (2)

[Claims] 1. An overhead wire tension balancer for maintaining a constant tension of an overhead wire installed in the air, wherein the overhead wire tension balancer comprises an outer tubular member,
An inner member that is concentrically received in the outer tubular member so as to be retractable in the axial direction, a coil spring that is concentrically interposed between the two members, and axial ends of the coil spring. The coil spring has a plurality of short coil springs, and outer and inner flange portions provided at positions opposite to each other in the axial direction of the inner and outer peripheral surfaces of the respective members facing each other so as to be locked. A tension balancer for overhead wire, which is constructed by combining two adjacent ones with their winding directions staggered. 2. The overhead wire tension balancer according to claim 1, wherein the short coil spring is wound so as to avoid integer winding.