JPH0789689B2 - Wire tension measuring method and wire car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a wire tension measuring method, and more particularly to a wire tension measuring method for measuring wire tension in an overhead wire car part and an overhead wire used therefor. Regarding the gold car.

<Prior Art> A conventional method known as a method for measuring the wire drawing tension at a portion of an overhead wire car or a device therefor is, for example, the one disclosed in Japanese Examined Patent Publication No. 59-39694. .

In addition, as a technique proposed to improve the deficiency of the Japanese Patent Publication No. 59-39694, Japanese Patent Application No. 62-293919.
Japanese Patent Application Laid-Open No. 1-136509 and Japanese Patent Application No. 63-102892 (Japanese Patent Application Laid-Open No. 1-278212).

<Problems to be Solved by the Invention> Each of these conventional techniques has some advantages, but it also has disadvantages.

In other words, all of these measures the angle between the electric wire and the wire car for the overhead wire, and calculates the wire tension based on the relational expression with this angle as a variable. Originally, a fairly sophisticated electronic device for calculating the wire tension is indispensable, and an arm for angle measurement is required, but it can shake more than necessary due to the shock received from the electric wire passing through this arm. May cause "noise".

That is, each of these conventional techniques has advantages and disadvantages, and it is not always possible to satisfy the best specifications under any wire drawing conditions.

Therefore, the present invention has a character different from those of the prior art, and the measured value can be displayed as the extension tension as it is, and an arm that may be shocked by the passing electric wire is unnecessary. The present invention aims to provide a wire tension measuring method and an overhead wire car used for the method.

<Means for Solving the Problems> Specifically, an overhead wire car having a rotating body formed of a plurality of segments for passing electric wires and other accessories is used, and a rotation center received by the segments from the electric wires is used. The load F in the direction is measured, and the load F is used for the overhead wire by utilizing the relationship of F ≈ 2Tsin Θ / 2 existing between the load F and the wire tension T at the wire car part for the overhead wire via the central angle Θ of the segment. Provided is a method for measuring a wire drawing tension by measuring a wire drawing tension in a metal wheel part [Claim (1)], and a plurality of segments formed with grooves for electric wires and other accessory guides are connected. An endless chain body, a plurality of support rollers arranged in an arc for rotating the chain body endlessly, and a load measuring means for measuring a load F in the direction of the center of rotation received by a segment from an electric wire via the support roller. Prepare A plurality of segments, each of which is composed of a metal wheel for overhead wire [claim (2)] to a wheel piece portion having grooves for guiding electric wires and other accessories, and a spoke portion protruding from the wheel piece portion, are spokes. Contact the load measuring means to the tip of the part.
An intermediary wire car (claims (3) and (4)) provided with a rotating body formed by circularly arranging around a rotating shaft portion in an intervening state.

<Operation> That is, according to this wire drawing tension measuring method, F is mediated by the center angle Θ of the segment which is given in advance as a fixed value.
Since the wire tension T is obtained from the load F in the direction of the center of rotation received by the segment using the relationship of ≈2 sin Θ / 2, the load F, which is a variable here, is constant without any special calculation process. By simply multiplying by a coefficient, it can be grasped as it is as the wire drawing tension T.

Explaining the relation of F≈2sin Θ / 2,
This is given by the relationship of T = F / 2sin Θ / 2, which is approximately derived from the equilibrium relationship of the forces around the segment in the overhead wire car. The reason why T = F / 2sin Θ / 2 is approximate is that the bending moment and shearing force applied to the wire are actually related in the equilibrium relationship of the forces around the segment, but the curvature of the segment is sufficiently large and Θ is This is because T = F / 2sin Θ / 2 is derived assuming that these can be ignored under the assumption that they are sufficiently small. Therefore, T≈Tsin Θ / 2.

In addition, the overhead wire car used in this method for measuring the wire tension requires only the means for measuring the load that the segment receives from the electric wire, so that the problem of "noise" due to the shock due to the electric wire passing through does not occur.

<Examples> Examples of the present invention will be described below with reference to FIGS. 1 to 5.

In this wire drawing tension measuring method, the overhead wire car 1 is used.

As shown in FIG. 1, an overhead wire car 1 includes an endless chain body 2 as a “rotating body” for passing electric wires and other accessories, and the chain body 2 is arranged in an arc shape. It is rotatably supported endlessly by the plurality of supporting rollers 3, 3 ,. The chain body 2 is formed by connecting a plurality of segments 4, 4, ... In a chain shape or a caterpillar shape, and each segment 4 is formed with a groove portion 5 for guiding an electric wire or other accessory. .

Each of the segments 4 receives a constant load F in the direction of the center of rotation in accordance with the wire tension generated in the passing electric wire C. The load F is applied to the segment 4p located at the apex of the arc. With respect to the above, the load is measured by the load measuring means, specifically, the load cell 6 via the supporting rollers 3p, 3p. The pair of support rollers 3p, 3p in this portion are configured to support the segment 4p coming to this portion by only this pair so that the load received by the segment 4p is accurately transmitted to the load cell 6. Specifically, the support roller
3p and 3p are held by a holding frame 7 that holds only these individually, and the distance between them is smaller than the length of the segment 4 and is slightly separated from the front and rear support rollers 3, 3.

In addition, a magnetic generator (not shown) is embedded in each segment 4, and the magnetism from the magnetic generator is detected by a magnetic sensor (not shown) provided at the apex of the arc,
It is adapted to detect whether or not the segment 4p is positioned at the apex of the arc.

In addition to this, the overhead wire car 1 also includes support rollers 3, 3,
Although it is provided with a frame for holding ... and various other accessories, the illustration thereof is omitted for the sake of simplicity of the drawing.

The wire tension is measured using the overhead wire car 1 as follows.

If the central angle Θ of each segment 4 is used, the wire drawing tensions T ₁ , T ₂ and the load F generated on the electric wire C at the entrance and exit of the overhead wire car 1 are F≈ (T ₁ + T ₂ ) sin Θ They are related by the relational expression / 2. Here, if T ₁ = T ₂ = T, then this formula is
≒ 2Tsin Θ / 2.

Therefore, the wire drawing tension T is directly obtained from the load F measured by the load cell 6 simply by multiplying it by a coefficient of 1 / (2sin Θ / 2) obtained from Θ given as a central value of the segment 4 in advance. Can be obtained.

However, it is best to measure the load F related to the segment 4p located at the apex of the arc, so as described above, the combination of the magnetic generator and magnetic sensor
The state in which 4p is positioned at the apex of the arc is detected, and the load F in that state is used as tension information. A graphical representation of this relationship is as shown in FIG. That is, the upper curve shows the output voltage from the load cell 6, the middle curve shows the output voltage from the magnetic sensor, and the lower curve shows the output voltage from the sampling and holding circuit. When the output voltage forms a peak, the arc vertex position of the segment 4p is indicated. At this time, the corresponding load cell output voltage is held by the sampling hold circuit. If the output of the sampling and holding circuit is displayed in analog or digital form based on the above-mentioned coefficient processing, this becomes the wire drawing tension T.

The advantage of this wire drawing tension measuring method is that the wire drawing tension T can be measured only by measuring the load F without a special calculation process. That is, a high-level electronic device for a special calculation process is unnecessary, and the required device can be simplified and the cost can be reduced accordingly. Further, this wire tension measuring method does not require an arm that is susceptible to a shock due to a passing electric wire in the overhead wire car 1 used therein, and thus "noise" caused by this shock. It is also a big advantage that it does not cause the problem of.

The trolley wire 10 shown in FIG. 4 is characterized by its rotating body 11. That is, the rotating body 11 is composed of a plurality of segments 12, 12, ... Similar to the above embodiment, but each segment 12 is formed with a groove 13 for guiding an electric wire or other accessory. It is formed by the wheel piece portion 14 and the spoke portion 15 protruding from the wheel piece portion 14, and the load cell 16 is abutted on the tip of the spoke portion 15.
They are arranged in a circle around the rotary shaft 17 with the interposition. Since the other points are substantially the same as those of the above-described embodiment, the description thereof will be omitted.

An overhead wire wheel 20 shown in FIG. 5 is a modified example of the other embodiment and is based on an overhead wire wheel known as JP 61-41377. That is, this overhead wire car
In FIG. 20, the rotary shaft portion 21 is provided with a spoke receiving portion 23 having a spring 22 built therein, and the spoke portion 24 is fitted in the spoke receiving portion 23 so as to be slidable as indicated by arrow X. . In other words, each segment 25 is urged outward by the spring 22 so as to always maintain the required perfect circular state, and at the same time, can be displaced from the center according to the load of the electric wire C. . Incidentally, reference numeral 26 in the drawing denotes a divided piece, and a groove 27 is formed in this divided piece. Also, 28
Is a chain and 29 is a sprocket piece. Since the other points are substantially the same as those of the other embodiments, common parts are denoted by the same reference numerals and the description thereof is omitted. For a description of a portion not directly related to the present invention, see JP-B-61-41377.

<Effects of the Invention> According to the wire drawing tension measuring method of the present invention, as described above, the wire car for overhead wire is provided with the rotating body formed of a plurality of segments for passing electric wires and other accessories. , The central angle Θ of the segment given in advance as a fixed value
The wire drawing tension T is calculated from the load F in the direction of the rotation center that is received by the segment by using the relationship of F≈2T sin Θ / 2. Therefore, a special calculation process is performed only by measuring the load F. Since the wire drawing tension T can be measured without passing through, and a high-level electronic device for a special calculation process is not required, the required device can be simplified and the cost can be reduced.

Further, according to the wire drawing tension measuring method of the present invention, the overhead wire car used therefor does not require an arm that is susceptible to a shock due to an electric wire passing therethrough as in the above-described conventional art. "Noise" caused by
There is also an excellent effect that more stable measurement is possible without causing the problem of.

[Brief description of drawings]

FIG. 1 is a schematic side view of an overhead wire car according to the present invention, FIG. 2 is a schematic sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an output voltage from a load cell. FIG. 4 is an explanatory view showing the relationship between the output voltage from the magnetic sensor and the output voltage from the sampling and holding circuit in the form of a graph. FIG. 4 is a schematic side view of an overhead wire car according to another embodiment.
And FIG. 5 is a schematic side view with a part omitted of an overhead wire car according to another embodiment. 1,10,20 …… Gray wheel for overhead wire 2 …… Chain body 3 …… Supporting rollers 4,12,25 …… Segment 5,13,27 …… Groove 6,16 …… Load cell (load measuring means) 11… … Rotating body 14 …… Wheel pieces 15, 24 …… Spokes 17 …… Rotating shaft 21 …… Rotating shaft 22 …… Spring 23 …… Spoke receiving part C …… Wire

Claims (4)

[Claims] 1. An overhead wire car equipped with a rotating body formed of a plurality of segments for passing electric wires and other accessories, and measuring a load F received from the electric wires in the direction of the center of rotation. Load F and wire tension T at the location of overhead wire car
Between F and F, which is mediated by the central angle Θ of the segment
A wire tension measuring method which measures the wire tension at the portion of a wring car for overhead lines by using the relationship of 2TsinΘ / 2. 2. An endless chain body formed by connecting a plurality of segments in which grooves for guiding electric wires and other accessories are formed, and a plurality of support rollers arranged in an arc shape so as to rotate the chain body endlessly. And a load-carrying wire car comprising load measuring means for measuring a load F received by the segment in the direction of the rotation center from the electric wire via the support roller. 3. A load measuring means is abutted to a plurality of segments, each of which comprises a wheel piece portion having grooves for guiding electric wires and other accessories and a spoke portion protruding from the wheel piece portion, and a tip of the spoke portion. A wire car for an overhead wire, which includes a rotating body formed by arranging in a circular shape around the rotating shaft portion in a state of being interposed. 4. A load measuring means, wherein the rotary shaft portion is provided with a spoke receiving portion having a spring built therein, the spoke portion being slidably fitted in the spoke receiving portion, and the spoke portion being in contact with the tip thereof. The wire car for overhead lines according to claim 3, wherein the wire car is supported by the spring.