JP2011240804A - Tension balancer for aerial wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension balancer for an aerial wire having high reliability of operation and allowing the device thereof to be made compact and having a low cost.SOLUTION: The tension balancer for the aerial wire comprises: a spring unit 1 and a pulley unit 2 provided at a pole brace P; a wire W1 which is put across the spring unit 1 and the pulley unit 2; and a wire W2 which is put across the pulley unit 2 and fittings 4a and 4b of an aerial wire 3. In the tension balancer, a radius R1 of a wound-out portion of a wire winding groove 21a of a pulley 21 winding the wire W1 put across the spring unit 1 and the pulley unit 2, and a radius R2 of a wound-out portion of a wire winding groove 22a of a pulley 22 winding the wire W2 put across the pulley unit 2 and the fittings 4a and 4b of the aerial wire 3 are made different from each other. In the wire W1 put across the spring unit 1 and the pulley unit 2, a length adjuster 5 for adjusting the length of the wire W1 is disposed.

Description

  The present invention relates to an overhead wire tension balancer used for maintaining the tension of an overhead wire such as a train wire.

Conventionally, overhead wires such as train wires (suspended wires, auxiliary suspended wires, trolley wires) have an effect on tension due to expansion / contraction due to temperature changes, creep, elastic elongation due to wear of trolley wires, and inclination of the support over time. In order to receive, it is necessary to keep the tension of the overhead wire constant.
In addition, it is desirable to perform the adjustment automatically and make it maintenance-free. For this reason, various overhead wire tension balancers have been proposed.

  Among these, a pulley type (weight type) tension balancer has been used for a long time, but it is susceptible to external factors such as damage to the bearing of the rotating shaft, snowfall, snow accumulation, and icing. Furthermore, in addition to the problem that the flow of the overhead wire in the steep slope section cannot be suppressed, periodic maintenance work such as refueling is necessary.

On the other hand, the spring-type tension balancer (see, for example, Patent Documents 1 and 2) has a track record of maintenance-free, and has been increasingly used not only for conventional lines but also for Shinkansen in recent years. Since the structure is simple and has an arbitrary spring constant, it is accompanied by a change in tension applied to the overhead wire when the overhead wire is expanded and contracted.
Theoretically, by combining a large number of springs in series, the rate of change in tension becomes small, but there is a problem that the apparatus becomes large.

Furthermore, there is a gas tension balancer (see, for example, Patent Document 3) that has been put into practical use in recent years. This gas tension balancer replaces the “spring” of a spring tension balancer with an enclosed gas pressure. It is what you use.
However, since high-precision equipment is required to maintain the reliability of the enclosed gas pressure, the cost of the apparatus is increased, and at the present time, there are few achievements regarding long-term maintenance-free operation.

  In addition, although a hydraulic tension balancer has been proposed, there is a problem that the cost of the apparatus becomes high because high-precision equipment is required to maintain the hydraulic pressure. Periodic inspection was necessary because of leakage.

Japanese Utility Model Publication No. 39-19536 Japanese Patent No. 3477038 Japanese Patent No. 4335994

  In view of the problems of the above conventional overhead wire tension balancer, the present invention provides an overhead wire tension balancer that is highly reliable in operation, can be downsized, and can be manufactured at low cost. Objective.

  In order to achieve the above object, an overhead wire tension balancer of the present invention includes a spring unit and a pulley unit installed on a column, a wire spanned between the spring unit and the pulley unit, a pulley unit and an overhead wire mounting bracket, An overhead wire tension balancer comprising: a wire wound around the wire; a radius of a winding portion of a wire winding groove of a pulley that winds the wire wound between the spring unit and the pulley unit; a pulley unit and an overhead wire; The wire wound around the mounting bracket of the pulley is formed so that the radius of the winding portion of the wire winding groove of the pulley is different, and the length of the wire is stretched between the wire spanned between the spring unit and the pulley unit. The overhead wire tension balancer is characterized in that a length adjusting means is provided.

  In this case, the wire winding groove of the pulley that winds the wire can be formed in a spiral shape whose radius gradually changes.

  In addition, the spring-side pulley and the overhead wire-side pulley for winding the wire are integrated so that they can be attached and detached, and the pulley can be arbitrarily combined with multiple types of pulleys with different radii of the wire winding groove unwinding part. Can be assembled to the pulley unit.

The overhead wire tension balancer of the present invention has the following effects.
(1) In the correlation between the urging force of the spring of the spring unit and the radius of the unwinding portion of the wire winding groove of the pulley that winds up the wire of the pulley unit, the magnitude of the tension applied to the overhead wire is arbitrarily adjusted. Can do.
(2) Since the spring unit has a follow-up function against external load factors such as earthquakes and strong winds, it is possible to prevent accidents such as function stoppage due to disconnection of wires, and to build a highly reliable system. be able to.
(3) The spring unit and the wire length adjusting means can be installed at a low position near the ground, and the stroke and the state of the spring unit can be easily confirmed visually, and the wire length adjusting means. Can be easily adjusted. Further, it is possible to provide an overhead wire tension balancer that can easily prevent the grease sealed in the spring unit from being scattered.

(4) In particular, by forming the wire winding groove of the pulley that winds the wire into a spiral shape whose radius gradually changes, the change in the biasing force of the spring of the spring unit due to the expansion and contraction of the spring unit can be reduced. By changing the radius of the unwinding portion of the wire winding groove of the pulley that winds the wire, it can be increased or offset synergistically, thereby arbitrarily adjusting the rate of change in tension applied to the overhead wire be able to.

(5) In addition, the pulley on the spring side and the pulley on the overhead wire side that winds the wire are integrated so as to be detachable, and a plurality of types of pulleys having different radii of the wire winding groove unwinding portions are provided on the pulley. By arbitrarily combining and assembling the pulley unit, the magnitude of the tension applied to the overhead wire can be arbitrarily adjusted within a wide range.

1 shows an embodiment of an overhead wire tension balancer according to the present invention, where (a) is an overall right side view, (b) is an overall front view, and (c) is an explanatory view showing the relationship between pulleys and wires of a pulley unit. . A spring unit is shown, (a) is a right side view, (b) is a front sectional view, (c) is a plan view, (d) is a right side view when a cover is provided, and (e) is a plan view thereof. It is. It is explanatory drawing which shows the component of a spring unit. The pulley unit is shown, (a) is a partially broken plan view, (b) is a right side view. It is explanatory drawing which shows the component of a pulley unit. It is explanatory drawing which shows the component of a pulley unit.

  Embodiments of an overhead wire tension balancer according to the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of an overhead wire tension balancer according to the present invention.
As shown in FIG. 1, the overhead wire tension balancer includes a spring unit 1 and a pulley unit 2 installed on a column P, two wires W1 spanned between the spring unit 1 and the pulley unit 2, and a pulley unit. 2 and an overhead wire tension balancer composed of two wires W2 spanned between the mounting brackets 4a and 4b of the overhead wire 3, and winds the wire W1 spanned between the spring unit 1 and the pulley unit 2. Winding of the wire winding groove 22a of the pulley 22 for winding the radius R1 of the winding portion of the wire winding groove 21a of the pulley 21 and the wire W2 spanned between the pulley unit 2 and the mounting brackets 4a, 4b of the overhead wire 3 It is formed so that the radius R2 of the protruding portion is different, and the wire W1 spanned between the spring unit 1 and the pulley unit 2 So that disposing the length adjusting unit 5 of the ear W1.

As shown in FIGS. 1, 2 (a) to 2 (c) and FIG. 3, the spring unit 1 is arranged so as to be slidable and not rotated in the outer cylinder 11. The sliding rod 12, the coil springs 13a and 13b having different winding directions for urging the sliding rod 12 into the outer cylinder 11, and one end of the outer cylinder 11 are swung to the support P via the fixing bracket 6. A connecting piece 14 for movably fixing, a connecting piece 15 for connecting the protruding portion 12a of the sliding rod 12 protruding from the other end side of the outer cylinder 11 and the wire W1, and a protruding portion 12a of the sliding rod 12 The scale plate 17 is configured to measure the protruding amount of the sliding rod 12 by being fixed to the outer cylinder 11 through the fixture 16 and extending toward the one end side of the outer cylinder 11.
In this case, as shown in FIGS. 2D and 2E, the spring unit 1 has a cover for preventing rain and dust from entering the sliding portion of the spring unit 1 at the upper part as necessary. 1A can be provided. In this case, the cover 1A can be attached to the protruding portion 12a of the sliding rod 12 via the fixture 16, the scale plate 17 is fixed to the outer cylinder 11, and the sliding rod 12 is used with the end portion of the cover 1A as a sensor. The amount of protrusion can be measured.

  Here, the end plate 11a on the other end side of the outer cylinder 11 is formed with a rectangular through-hole through which the sliding rod 12 is inserted. So as to be slidable and not to rotate.

  In this embodiment, the sliding rod 12 is configured by arranging two metal plates and arranging a spring seat 12b at the end. For example, the two metal plates are formed of a rectangular tube material. Can also be configured.

  Further, in this embodiment, coil springs 13a and 13b having different winding directions are provided in order to reduce the rotational force due to the expansion and contraction of the spring that biases the sliding rod 12 in the direction in which the sliding rod 12 is pulled into the outer cylinder 11. However, the spring can be configured by a single coil spring or a spring having a rectangular cross section.

  Moreover, a shimmer and a turnbuckle can be used suitably for the length adjustment means 5 which adjusts the length of the wire W1 spanned between the spring unit 1 and the pulley unit 2.

  In this way, by using the spring unit 1 for the tension balancer, the spring unit 1 has a function of following external load factors such as earthquakes and strong winds, so that the function is stopped due to the disconnection of the wire W1 (and the wire W2). Accidents can be prevented and a highly reliable system can be constructed.

  Further, the spring unit 1 and the wire length adjusting means 5 can be installed at a low position, the state of the spring unit 1 can be easily confirmed by visual observation, and the length for adjusting the length of the wire W1. The height adjusting means 5 can be easily adjusted.

  As shown in FIG. 1 and FIGS. 4 to 6, the pulley unit 2 is rotatable through a main body 20, a rotary shaft 20 a disposed so as to span the main body 20, and a bush 20 b on the rotary shaft 20 a. A pulley 21 having a symmetrical shape for winding two wires W1 spanned between the spring unit 1 and the pulley unit 2, and arranged to rotate integrally with the pulley 21 on both sides of the pulley 21, The pulley 22 that winds up two wires W2 spanned between the pulley unit 2 and the mounting brackets 4a and 4b of the overhead wire 3 is fixed to the column P via the fixing bracket 7 in accordance with the height of the overhead wire 3. And a connecting piece 23 for the purpose.

  Here, the pulley 21 is provided with a square shaft portion 21b at both ends thereof, and the pulley 21 and the pulley 22 rotate integrally by fitting a square hole portion 22b formed in the pulley 22 into the square shaft portion 21b. To do.

Further, a grease groove is formed on the inner peripheral surface of the bush 20b so that the grease sealed in the gap between the rotary shaft 20a and the pulley 21 can be easily introduced.
The grease is injected into the gap between the rotary shaft 20 a and the pulley 21 by removing the grease nipple 25 disposed on the pulley 21.

The wires W1 and W2 are attached by crimping the terminals W1a and W2a to the end portions thereof, and the end portions are inserted into wire locking holes 21c and 22c formed in the pulleys 21 and 22, and the locking fittings 21d and 22d. Thus, the pulleys 21 and 22 are locked.
Note that the wires W1 and W2 can be formed of a series of wires.

  Further, in order to prevent the pulleys 21 and 22 from rotating when the tension balancer is installed, a set bolt 24 for temporarily fixing the pulleys 21 and 22 is provided on the main body portion 20 of the pulley unit 2.

By the way, the pulleys 21 and 22 of the pulley unit 2 are formed so that the radius R1 of the unwinding portion of the wire winding groove 21a of the pulley 21 and the radius R2 of the unwinding portion of the wire winding groove 22a of the pulley 22 are different. To do.
Thereby, the magnitude of the tension F2 applied to the overhead wire 3 via the pulley unit 2 by the spring unit 1 is
Tension F2 applied to overhead wire 3 = (Tension F1 of spring unit 1) × (radius R1 of wire winding groove 21a of pulley 21) ÷ (radius R2 of wire winding groove 22a of pulley 22)
For example, by setting the radius R1: radius R2 to 1: 2, it is possible to apply a tension F2 that is ½ times the tension F1 of the spring unit 1 to the overhead wire 3, while By setting the radius R1: radius R2 to 2: 1, a tension F2 that is twice the tension F1 of the spring unit 1 can be applied to the overhead wire 3.
As a result, the tension F1 of the spring unit 1 generated by the urging force of the springs 13a and 13b of the spring unit 1 and the unwinding of the wire winding grooves 21a and 22a of the pulleys 21 and 22 for winding the wires W1 and W2 of the pulley unit 2 are achieved. In the correlation with the radii R1 and R2 of the portion, the magnitude of the tension F2 applied to the overhead wire 3 can be arbitrarily adjusted.

Then, the wire winding groove 21a of the pulley 21 that winds the wire W1 spanned between the spring unit 1 and the pulley unit 2 is formed in a spiral shape in which the radius R1 gradually changes.
In the present embodiment, the wire winding groove 21a of the pulley 21 that winds the wire W1 is formed in a spiral shape in which the radius R1 gradually decreases, and the magnitude of the tension F2 applied to the overhead wire 3 is set. As a reference, the radius R2 of the wire winding groove 22a of the pulley 22 is set so that the expansion / contraction amount of the overhead wire 3 can be absorbed by one rotation of the pulley 22, and at least at the initial setting and at the points of rotation angles of 180 ° and 360 °. The moment at is constant. However, the rotation speed of the pulley 22 is not limited to this when the amount of expansion / contraction of the overhead wire is increased.
In the present embodiment, the wire winding groove 21a of the pulley 21 that winds the wire W1 is formed in a spiral shape in which the radius R1 gradually decreases, but is formed in a spiral shape in which the radius R1 gradually increases. You can also do it.
Further, in this embodiment, the wire winding groove 22a of the pulley 22 for winding the wire W2 spanned between the pulley unit 2 formed at a constant radius R2 and the mounting brackets 4a and 4b of the overhead wire 3 has a radius R2. It is also possible to form a spiral shape in which gradually changes.
The spiral shape can be arbitrarily set, but may be a shape formed of an involute curve, for example.
Accordingly, the pulley 21 that winds the wire W1 (and / or the wire W2) of the pulley unit 2 from the change in the tension F1 of the spring unit 1 caused by the biasing force of the springs 13a and 13b of the spring unit 1 due to the expansion and contraction of the spring unit 1. The radius R1 (and / or radius R2) of the unwinding portion of the wire winding groove 21a (and / or the wire winding groove 22a) of the (and / or pulley 22) can be increased or offset synergistically. Accordingly, the magnitude of the tension F2 applied to the overhead wire 3 can be arbitrarily adjusted.

Also, in the pulleys 21 and 22 for winding the wires W1 and W2, respectively, a plurality of types of pulleys 21 and 22 having different radii R1 and R2 of the winding portions of the wire winding grooves 21a and 22a are prepared, and these are arbitrarily combined. Thus, the pulley unit 2 can be assembled.
Thereby, the magnitude | size of tension | tensile_strength F2 concerning the overhead wire 3 can be arbitrarily adjusted in the wide range.

Next, a method for installing the overhead wire tension balancer will be described.
First, the overhead wire 3 is temporarily fixed to a predetermined height of the support P with a second simmer (not shown).
Then, after attaching the spring unit 1 and the pulley unit 2 to a predetermined position of the column P, the wires W1 and W2 are locked to the pulleys 21 and 22 of the pulley unit 2, and the lengths of the mounting brackets 4a and 4b and the wires The adjusting means 5 fastens the wires W1 and W2 around the pulleys 21 and 22, respectively, and fixes the rotation of the pulleys 21 and 22 to the set bolt 24.
Next, a first shimmer (not shown) is installed between the spring unit 1 and the pulley unit 2, and the spring unit 1 is pulled out to an amount corresponding to the temperature at that time and connected to the wire W1 (set in the standard state). To do.)
Next, the set bolt 24 is removed, and the length pulled out by the spring unit 1 is rotated toward the overhead wire 3 by rotating the pulley unit 2 to determine the length of the wire W2.
Next, after determining the length of the overhead wire 3 temporarily fixed from the determined length of the wire W2, the wire W2 is connected.
Thereafter, the tension of the second shimmer is gently removed, and then the tension of the first shimmer is gently removed, and the wires W1 and W2 are brought into a balanced state, thereby applying a predetermined tension F2 to the overhead wire 3. Like that.
Finally, final adjustment is performed by adjusting the pull-out amount of the spring unit 1 with a turnbuckle as the length adjusting means 5.

  The overhead wire tension balancer of the present invention has been described based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations thereof are appropriately made within the scope not departing from the gist thereof. Can be changed.

  The overhead wire tension balancer of the present invention is highly reliable in operation, downsizing the apparatus, and reducing the cost. Therefore, overhead wires such as train wires (suspended wires, auxiliary suspended wires, trolley wires) are used. It can be used suitably for the application of a tension balancer used for applying tension.

DESCRIPTION OF SYMBOLS 1 Spring unit 1A Cover 17 Scale plate 2 Pulley unit 21 Pulley 21a Wire winding groove 22 Pulley 22a Wire winding groove 3 Overhead wire 4 Mounting bracket 5 Wire length adjustment means F1 Spring unit tension F2 Tension applied to sky wire P Strut R1 Radius of unwinding part R2 Radius of unwinding part W1 Wire W2 Wire

Claims (3)

  An overhead wire tension balancer comprising a spring unit and a pulley unit installed on a support, a wire spanned between the spring unit and the pulley unit, and a wire spanned between the pulley unit and the overhead wire mounting bracket, The wire winding of the pulley that winds the wire spanned between the pulley unit and the overhead wire mounting bracket, and the radius of the wire winding groove of the pulley that winds the wire spanned between the spring unit and the pulley unit An overhead wire tension balancer formed so that the radius of the unwinding portion of the groove is different, and a wire length adjusting means is provided on the wire spanned between the spring unit and the pulley unit. .   2. The overhead wire tension balancer according to claim 1, wherein the wire winding groove of the pulley for winding the wire is formed in a spiral shape having a gradually changing radius.   The spring side pulley and the overhead wire side pulley that winds the wire are integrated so as to be detachable, and the pulley can be arbitrarily combined with a plurality of types of pulleys having different radii of the winding portion of the wire winding groove, 3. The overhead wire tension balancer according to claim 1, wherein the overhead wire tension balancer is assembled to a pulley unit.

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