JPH0444486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application of the Invention> The present invention relates to a wire drawing wheel and a wire drawing tension measuring method using the same.

<Prior art> As a conventional method for measuring wire drawing tension, a wire drawing tension detecting means is provided in a wire drawing winch installed at an engine station or a wire drawing device itself installed at a drum station. The wire tension is measured as the engine field tension or the drum field tension at the engine field, or a wire rolling wheel with an angle tension meter is installed for each tower, and the wire tension is measured using this angle tension meter. A method is known in which the tension is measured as the intermediate wire drawing tension, that is, the wire drawing tension generated in the wire rolling wheel of each steel tower.

<Problems to be Solved by the Invention> Incidentally, the wire tension at the engine field or the wire tension at the drum field and the intermediate wire tension are different due to the metal wheel resistance, the resistance caused by the protector passing through the metal wheel, and the like. Therefore, it is necessary to accurately grasp not only the wire tension at the engine field and the wire tension at the drum field, but also the intermediate wire tension. However, although it is relatively easy to measure the wire tension at the engine field or the wire tension at the drum field and accurate values can be obtained, almost no practical data have been obtained regarding the intermediate wire tension. In other words, although the above-mentioned angle-closing tension meter can measure the intermediate wire tension to some extent, it is difficult to measure the tension that is actually caused by the wheel resistance (resistance of the metal wheel against the passage of the wire) or the resistance of the wire passing through the protector. The structure ignores the difference in wire tension at the entrance and exit of the wire rolling wheel, and can only perform a very rough detection of the tension.Moreover, the intermediate wire tension changes significantly as the wire passes through the protector. It was of little use in measuring the tension of the wire, and was still insufficient in terms of accurately grasping the intermediate drawing tension.

Therefore, the present invention aims to provide a wire drawing tension measuring method that can more accurately measure the intermediate wire drawing tension on a wire drawing wheel provided on each steel tower, and a wire drawing wheel used therein.

<Means for solving the problem> Specifically, a first angle meter for measuring the swing angle Ψ as the electric wire passes, and a bending angle that is the angle between the electric wire and the horizontal line included in the metal wheel surface on the exit side. Wire extension wire comprising a second angle meter for measuring the angle σ for deriving Θm ₂ , and a third angle meter for measuring the deflection angle ζ on the wire wheel surface that occurs due to the horizontal angle occurring in the wire. In addition to providing the vehicle, we also provide numerical information obtained through this wire extension wheel, the span distance S between the applicable steel towers, the height difference h between the applicable steel towers, and the unit length weight Q of electric wire between the applicable steel towers. Therefore, we provide a method for measuring wire drawing tension by determining the outlet side tension T ₂ applied to the wire at the outlet side of the wire rolling wheel, and furthermore, A wire drawing tension measurement method in which the tension T ₁ on the entrance side of the wire drawing wheel is also determined by using the tension Fw obtained from T ₂ and the tension detection means interposed in the suspension of the wire drawing wheel. It provides:

<Operation> That is, with a wire rolling wheel having such a configuration, the deflection angle Ψ, the angle σ for deriving the bending angle Θm ₂ , and the deflection angle ζ are measured, and the above-mentioned values that can be known in advance are added to these. By combining these numerical values, the intermediate wire tension, which is constantly changing due to wheel resistance or protector passage resistance, and especially the intermediate wire tension, which changes greatly as it passes through the protector, can be calculated at a value close to the actual value. It is something that can be grasped.

<Example> Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 13.

First, to briefly explain the symbols etc. in the figures, in Figs. 4 and 5, line segments x and y are vertical lines included in the vertical plane, respectively, and line z is a metal wheel surface (extended line). This is a horizontal line included in a plane including the wire drawing wheel 1, that is, a plane including the vertical center line sv and the horizontal center line sc of the wire drawing wheel 1, or a plane parallel thereto. Also, in Figures 6 and 7, plane klmn and plane
oqrt is a horizontal plane, plane kmro and plane lntq are vertical planes, and plane pugi is a metal wheel plane (it is also a tension plane because it is the plane on which tension is acting).

The wire drawing wheel 1 used in this wire drawing tension measuring method includes first, second and third angle meters 2, 3, 4.
It is equipped with Both the first and third goniometers 2, 4
are both weight type, and the first goniometer 2 is a weight type.
and a potentiometer 6, the swing angle Ψ (fourth
The third angle meter 4 is equipped with a weight 8 and a potentiometer 9, and measures an arrow generated within the plane of the metal wheel due to the horizontal angle generated in the electric wire 7. Shake angle ζ in N direction (Fig. 4)
The second angle meter 3 is connected to a potentiometer 11 as a sensing part and is always brought into contact with the electric wire 7 with an abutment piece 12 at the tip. The bending angle Θm ₂ on the exit side of the wire rolling wheel 1, which is the angle formed by the horizontal line z and the electric wire 7 in the surface of the wire wheel, is derived from the formula described later. This is for measuring the angle σ (Fig. 5). In addition, 14 in the figure is the metal wheel 1 for wire extension.
This is a balance weight for aligning the entire center of gravity with the rotation center of the wheel 15. In this way, aligning the center of gravity with the center of rotation of the wheel 15 has the advantage that the deflection of the hanging cord 16 and the wire rolling wheel 1, which will be described later, can be matched and the detection of the deflection angle Ψ can be facilitated. be.

This wire rolling wheel 1 is suspended from each steel tower P by a hanging cord 16 with a tension detection means 17 interposed therebetween. The angle meters 2, 3, and 4 measure the deflection angle Ψ, the angle σ, and the deflection angle ζ, and the tension detection means 17 measures the tension.
Fw (which is the resultant force F of the wire drawing tensions T ₁ and T ₂ acting on the wire 7 and the dead weight W of the wire rolling wheel 1) is obtained as a variable depending on the wire drawing situation.

These numbers and the steel tower as a constant that can be known in advance as shown in Figure 9.
Span distance S ₂ between P ₂ and P ₃ , height difference between steel towers P ₂ and P ₃
h ₂ and electric wire unit length weight Q ₂ between towers P ₂ and P ₃
Using these, the inlet side tension T ₁ and the outlet side tension T ₂ in the wire rolling wheel 1 are determined as the intermediate line drawing tension, that is, the line drawing tension occurring in each steel tower in the line drawing section.

The method for determining this will be explained below.

Derivation of bending angle Θm ₂ from angle σ In FIG. 5, which schematically shows the geometrical relationship around the wheel 15 in the state shown in FIG. 4, bending angle Θm ₂ is calculated as Θm ₂ =π−α−σ−Ψ. can get.

Here, the angle α, which is the angle between the arm portion 13 and a line segment drawn from the center of the wheel 15 orthogonally to the line segment drawn parallel to the electric wire 7 from the center of the contact piece 12, is This is a constant determined in advance from the length of the portion 13, the groove bottom radius of the wheel 15, the radius of the contact piece 12, and the diameter of the electric wire 7.

In this example, σ is the angle formed by the vertical center line sv of the wire drawing wheel 1 and the arm portion 13 below, but σ may be the opposite, that is, the angle corresponding to α+Θm ₂ +Ψ. In that case, Θm ₂ =σ−α−Ψ.

Deriving the catenary curve Θ ₂ from the bending angle Θm ₂ To find the catenary angle Θ ₂ (the angle between the horizontal line and the electric wire 7 in the vertical plane) necessary for calculating the outlet side tension T ₂ from this bending angle Θm ₂ Consider FIG. 6, which shows the relationship of forces around the hanging point of the wire rolling wheel 1 in the state shown in FIG. 4, and FIG. 7, which shows a part of it. △ in this figure 6 and figure 7
From pab and △abc, the catenary angle Θ ₂ is given as. Note that ATN means arctangent.

Calculation of outlet side tension T ₂ Furthermore, the following formula is given as a general rope theory formula regarding the state shown in FIG.

C=H/Q Lo=2Csinh(S/2C) A=Csinh(h/Lo)−S/2 Θ=ATN sinh(A/C) Where, C: Parameter, H: Horizontal component of tension T, Lo: Cable (wire) length when h becomes zero, A;
Distance from the lowest point to point P, Θ: catenary angle.

Therefore, this general search formula is changed to the state shown in Figure 9,
Applying Q=Q ₂ , S=S ₂ , h=h ₂ and assuming H=H ₂ , based on Θ _{2 found in (a), find H 2 such} that Θ ₂ −Θ=0. It is determined by the trial and error method, and T ₂ is determined from this H ₂ as T ₂ =H ₂ /cosΘ ₂ , which is clear in FIG.

Calculation of inlet side tension T ₁ △pde and △def in Figures 6 and 10
Than, is given.

Here, △fgh in FIGS. 6 and 11,
From △pgi and △pef, Θ _n1 = ATN [FcosΨ + T ₂ sin Θ _n2 /H _n1 ] Also, H _n1 as _a horizontal component force in the tension plane _of T ₁ is From the horizontal component force equilibrium relationship, H _n1 = H _n2 −FsinΨ, and from Fig. 6, H _n2 = T ₂ cosΘ _n2 , and F, which is the resultant force of T ₁ and T ₂ , is clearly shown in Fig. 12. It is given as F=−WcosΨcosζ+ √ ² − ² (1− ^{2 2} ). Note that W is the dead weight of the wire rolling wheel 1, which can be known in advance.

Therefore, using Θ ₁ obtained from this series of calculations, calculate H ₁ in the same way as for the outlet side tension T ₂ ,
From this H ₁ , T ₁ is determined as T ₁ =H ₁ /cosΘ ₁ , which is clear in FIG.

The above calculation method uses Θ _n1 and Θ _n2 , but if the wire rolling wheel 1 does not have a wobbling angle ζ, Θ _n1 = Θ ₁ and Θ _n2 = Θ ₂ . From, the second
Based on the angle σ actually measured by the angle meter 3, Θ ₁ is determined using the same method as in the above calculation method, and T ₂ and T ₁ are determined using this Θ ₂ and Θ ₁ . .

Then, when both tensions T ₂ and T ₁ , specifically, their horizontal components H ₁ and H ₂ are determined in this way, using this, the distance D between the obstacle 18 and the electric wire 7 is calculated as follows:
In FIG. 13, it can be calculated using the following formula.

_D = _{D O −D X D} W), and each symbol is the same as that described above.

In this wire drawing tension measurement method, the swing angle Ψ, the angle σ, and the swing angle ζ are measured using the wire drawing wheel 1 having the above-described configuration, and the above-mentioned various factors that can be known in advance are added to these measurements. By combining numerical values, it is possible to grasp the intermediate wire tension, which is constantly changing due to wheel resistance or protector passage resistance, and especially the intermediate wire tension, which changes greatly as the wire passes through the protector, at a value close to the actual value. It is a thing,
By using the wire rolling wheel 1 and the method for measuring wire tension, it is possible to grasp the wire drawing state more accurately.

In this embodiment, the metal wheels 1 for wire extension are provided on all the steel towers P, but the wire rolling wheels 1 are not necessarily limited to this, and it goes without saying that they may be provided only on the steel towers forming a specific section.

<Effects of the Invention> According to the wire rolling wheel and wire rolling tension measuring method according to the present invention, as explained above, the swing angle Ψ accompanying the passage of the wire, the horizontal line included between the wire and the wire wheel surface on the exit side, By measuring the angle σ for deriving the bending angle _Θm2 , which is the angle formed by The intermediate drawing tension, which is constantly changing due to resistance or protector passage resistance, can be grasped at a value close to the actual value, especially the intermediate drawing tension, which changes greatly as it passes through the protector, and the drawing condition can be more accurately determined. You will be able to understand it.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of a metal wheel for wire drawing according to the present invention, Fig. 2 is a schematic side view seen from the direction of the arrow in Fig. 1, and Fig. 3 is a schematic side view of the metal wheel for wire drawing according to the present invention. FIG. 4 is a schematic perspective view showing the state of use of the wire rolling wheel, FIG. 5 is an explanatory diagram showing the geometrical relationship around the wheel, and FIG. Figure 7 is an explanatory diagram showing the state of "force" around the hanging point of the metal wheel, and Figure 8 is an explanatory diagram that is a part of Figure 5.
The figure is an explanatory diagram regarding the general rope theory, FIG. 9 is a schematic side view showing the state of wire extension in this invention, and the first
FIG. 0 to FIG. 12 are explanatory diagrams, each of which is a part of FIG. 6, and FIG. 13 is an explanatory diagram showing the relationship between obstacles and electric wires. 1... Wire extension wheel, 2... First angle meter, 3...
2nd angle meter, 4...Third angle meter, 7...Electric wire, 1
6... Hanging cord, 17... Tension detection means, P...
Steel tower.

Claims (1)

[Claims] 1. A first angle meter for measuring the deflection angle Ψ as the electric wire passes, an angle σ for deriving the bending angle Θm ₂ , which is the angle between the electric wire and the horizontal line included in the metal wheel surface on the exit side. A wire rolling wheel comprising a second angle meter for measurement, and a third angle meter for measuring a wobbling angle ζ on the wheel surface caused by a horizontal angle occurring in an electric wire. 2. The wire rolling wheel according to claim 1 is suspended from a corner steel tower by a hanging cord, and the swing angle Ψ, bending angle Θm ₂ , wobbling angle ζ obtained through this wire extending wheel, and the distance between the relevant steel towers. From the span distance S, the height difference h between the relevant towers, and the unit weight Q of the electric wire between the relevant towers,
A wire extension tension measurement method that involves determining the exit side tension _T2 applied to the wire at the exit side of the wire rolling wheel. 3. Wire drawing is carried out by using the exit side tension T _{2 obtained in advance by the wire drawing tension measuring method according to claim 2} and the tension Fw obtained by the tension detection means interposed for hanging the wire drawing wheel. A method of measuring wire tension by determining the tension T ₁ at the entrance of a metal wheel.