JP2013188063A - Double torsional damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double torsional damper including a suppression wire having a falling-off preventive mechanism for a weight, preventing the suppression wire from being broken to secure the weight, and easy to find the breaking.SOLUTION: A double torsional damper 100 includes: a suppression wire 10-1; weights 20 fixed to both ends of the suppression wire 10-1; and an electric wire holding clamp 30 fixed to a central portion of the suppression wire 10-1. The suppression wire 10-1 includes core wires 51 having the same outer diameter, and a plurality of outer periphery wires 52. The plurality of outer periphery wires 52 are twisted around the core wire 51. Thin wires 12 are incorporated along grooves formed by twisting the outer periphery wires 52. The incorporated thin wires 12 slacken in a central portion between the weight 20 of the outer periphery wires 52 and the electric wire holding clamp 30.

Description

  More particularly, the present invention relates to a double torsional damper in which a suppression wire of the double torsional damper has a weight drop prevention mechanism.

  When wind blows on the overhead electric wire, Karman vortex, which is a cross-spreading vortex, is generated on the leeward side of the electric wire, and vibration having an amplitude of 1 to several tens of millimeters is generated. This vibration gives repeated stress to the electric wire at the reflection point of vibration such as a suspension support point or a tension clamp which becomes a fixed point of the overhead electric wire, and causes the metal fatigue deterioration and breakage with time. In order to prevent this, a vibration preventing device is attached in the vicinity of the support point of the overhead electric wire.

  FIG. 2 is a damper configuration diagram showing a configuration of a general double torsional damper which is a vibration preventing device. In FIG. 2, a general double torsional damper 110 includes a restraining wire 10, a weight 20, and a wire gripping clamp 30. The weight 20 includes a fixing portion 25 that is fixed to the suppression wire 10, and is fixed to both ends of the suppression wire 10. The wire gripping clamp 30 includes a clamp portion 35 that grips the overhead wire 40 and a restraining wire compression hole 37 that is fixed to the restraining wire 10, and the restraining wire compression hole 37 is compressed at the center of the restraining wire 10. The restraining wire 10 is fixed and attached to the overhead electric wire 40 by the clamp portion 35.

  In the double torsional damper 110 of FIG. 2, the Karman vortex vibration generated by the wind is transmitted to the suppression wire 10 and the weights 20 at both ends via the clamp portion 35. As a result, a new vibration is generated in the suppression line 10. This new vibration has a phase and period different from those of the Karman vortex, and acts to cancel the vibration of the Karman vortex, thereby preventing the fatigue and breakage of the overhead wire 40 over time.

  FIG. 7 is a configuration diagram showing a configuration of a conventional inhibition line. In FIG. 7, the conventional deterrence wire 50 is composed of the same core wire 51 and a plurality of outer peripheral wires 52, and the plurality of outer peripheral wires 52 are twisted around the core wire 51. Conventionally, the inhibition line 50 has been used as the inhibition line 10 in FIG. However, when new vibrations that act to cancel vibrations due to Karman vortices are repeatedly generated in the suppression line 50 over a long period of time, the same core wire 51 of the suppression line 50 and the plurality of outer peripheral lines 52 rub against each other. As a result, there was an accident in which the metal 20 was deteriorated and fractured, and the weight 20 dropped.

  In Patent Document 1, a wire rope having a predetermined length is inserted and bent through insertion holes provided on the left and right sides of a fall prevention plate attached to a cap of a clamp body, and the vicinity of a vibration node when a weight undergoes secondary resonance. The end of the wire rope is collectively compressed and fixed to the weight by the dovetail sleeve, and the wire rope is at least of the deterrent line so that tension does not act on the wire rope even if the deterrence line resonates and swings excessively. There is a description that the length is 10 to 20% or more from the length.

Japanese Patent Application No. 2006-230172

  The present invention has been made in order to solve such a problem, and an object of the present invention is to prevent the double torsional damper's deterrence line from having a weight fall prevention mechanism and to prevent the Provides a double torsional damper that does not fall and is easy to find a break.

  The double torsional damper of the present invention is a double torsional damper comprising a deterrence line, a weight fixed to both ends of the deterrence line, and a wire gripping clamp fixed to the center part of the deterrence line. A core wire having a plurality of outer peripheral lines, a plurality of outer peripheral lines are twisted around the core wire, and a thin wire is incorporated along a groove formed by twisting the outer peripheral lines. The thin wire is characterized in that it has a slack in the center portion between the weight of the outer peripheral wire and the wire gripping clamp.

  The thin wire of the double torsional damper of the present invention is a composite stranded wire or a stainless steel wire.

  One of the outer peripheral lines formed by twisting a plurality of outer peripheral lines around the core wire of the double torsional damper of the present invention has a higher fatigue limit than the other outer peripheral lines.

  The core wire of the double torsional damper of the present invention is a composite stranded wire.

  According to the present invention, since the deterrence wire of the double torsional damper has a mechanism for preventing the weight from falling, the weight of the deterrence wire is prevented from falling due to the breakage of the deterrence wire. A double torsional damper that can be discovered and exchanged can be provided.

The block diagram which shows the structure of the suppression line which shows 1st Example by this invention. The damper block diagram which shows the structure of a general double torsional damper. The block diagram which shows the structure of the suppression line which shows the 2nd Example by this invention. The block diagram which shows the structure of the suppression line which shows the 3rd Example by this invention. The 1st detection figure which shows the fracture | rupture detection example of the suppression line by this invention. The 2nd detection figure which shows the fracture | rupture detection example of the suppression line by this invention. Sectional structure figure which shows the structure of the conventional suppression line.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the inhibition line according to the first embodiment of the present invention. In FIG. 1 a, the deterrence wire 10-1 is composed of a core wire 51 having the same outer diameter and six outer peripheral lines 52 as in the configuration of the conventional deterrence wire 50 in FIG. 7, and 6 around the core wire 51. The outer peripheral wire 52 is twisted and configured, and the fine wire 12 having a high fatigue limit is incorporated along a groove formed by twisting these outer peripheral wires 52.

  In FIG. 1b, the double torsional damper 100 according to the first embodiment of the present invention is configured by replacing the inhibition line 10 in FIG. 2 with this inhibition line 10-1. The fine wire 12 incorporated in the restraining wire 10-1 has a predetermined slack in one zone of the central portion indicated by the arrows of the weight 20 and the wire gripping clamp 30 of the restraining wire 10-1. In FIG. 1b, only the right side is shown, but the left central part has the same predetermined slack. Moreover, it is desirable that these incorporated thin wires 12 are composite stranded wires or stainless steel wires.

  In the same way as in the case of the conventional suppression line 50, when the new vibration that acts to cancel the vibration due to Karman vortex is repeatedly generated in the suppression line 10-1 over a long period of time, the suppression line 10-1 The -1 core wire 51 and the plurality of outer peripheral wires 52 undergo fatigue deterioration by friction with each other. However, the incorporated thin wire 12 is a composite twisted wire, a stainless steel wire, or the like, has a higher fatigue limit than the core wire 51 and the outer peripheral wire 52, and has a slack in the center. For this reason, stress and friction are repeatedly generated over a long period of time, and even if the core wire 11 and / or the outer peripheral wire 11 are broken, the fatigue limit is high, the thin wire 12 with little friction is not broken, and the weight 20 falls. Can be replaced with a new double torsional damper by detecting abnormalities in the deterrence line during regular inspections.

  FIG. 3 is a block diagram showing the configuration of the inhibition line according to the second embodiment of the present invention. In FIG. 3, the restraining wire 10-2 is twisted by five outer peripheral wires 52 having the same outer diameter around the core wire 51 and one outer peripheral wire 14 having a higher fatigue limit than the other outer peripheral wires 52. Furthermore, the thin wire | line 12 is integrated and comprised in the groove part formed by twisting these outer peripheral lines together. Further, it is desirable to use a titanium alloy wire as the outer peripheral wire 14.

  In the double torsional damper 100 in which the deterrence wire 10-2 according to the second embodiment of the present invention is replaced with the deterrence wire 10 in FIG. Even if the outer peripheral line 52 is broken, the outer peripheral line 14 and the thin line 12 are not broken, as in the case of FIG. 1b, and the accident that the weight 20 falls is prevented and the abnormality of the deterrence line is regularly checked. Sometimes discovered, it can be replaced with a new double torsional damper.

  FIG. 4 is a block diagram showing the configuration of the inhibition line according to the third embodiment of the present invention. In FIG. 4, the restraining wire 10-3 is formed by twisting six outer peripheral wires 52 having the same outer diameter around the core wire 16 which is a composite twisted wire having a high fatigue limit, and further, these outer peripheral wires. The thin wire 12 is incorporated into a groove portion formed by twisting the wires.

  In the double torsional damper 100 according to the third embodiment of the present invention as described with reference to FIG. 3, even if the six outer peripheral lines 52 are broken due to repeated stress over a long period of time, the cord 16 The thin wire 12 does not break because of its high fatigue limit. For this reason, the accident that the weight 20 falls is prevented, and it can replace | exchange for a new double torsional damper by discovering the abnormality of a suppression line at the time of a periodic inspection.

  FIG. 5 is a first detection diagram showing an example of detection of breakage of the inhibition line according to the present invention. In FIG. 5a, the restraining line 10 of FIG. 2 is replaced with any of the restraining lines 10-1 to 1-3 of the present invention, and is installed on the overhead electric wire 40 as the double torsional damper 100 of the present invention. In this case, the left weight 20 is in the forward direction with respect to the deterrence wires 10-1 to 3 that are parallel to the overhead wire 40, and the right weight 20 is deterrence wires 10-1 to 10-3. It is fixed in the rearward direction.

  FIG. 5b shows a case where the restraining line is twisted and the weight 20 is rotated downward when a break occurs on the right side of the restraining lines 10-1 to 1-3. By finding an abnormality in the setting direction of the weight 20 at the time of periodic inspection, it can be replaced with a new double torsional damper 100.

  FIG. 6 is a second detection diagram showing an example of detection of the deterrence line break according to the present invention. In FIG. 6A, the core line and the outer peripheral line are broken on the right side of the deterrence lines 10-1 to 3, and the deterrence line is bent. The weight 20 shows a case where the weight 20 hangs downward at a bending angle α without falling. 6b shows a case where the core wire 51 and the outer peripheral line 52 in FIG. 2 are broken, FIG. 6c shows a case where the core wire 51 and the outer peripheral lines 52, 14 in FIG. 3 are broken, and FIG. The case where the core wire 16 and the outer peripheral wire 52 in FIG.

  In any of FIGS. 6 b to 6 d, the incorporated thin wire 12 has a slack in the central portion between the weight of the outer peripheral wire and the electric wire gripping clamp, so that the bending angle α in FIG. 6 a is further increased. It becomes possible. This makes it possible to more easily find the weight 20 that drastically hangs down during regular inspection, and can be quickly replaced with a new double torsional damper 100.

  As described above, according to the present invention, since the deterrence wire of the double torsional damper has a mechanism for preventing the weight from falling, the weight is prevented from falling due to the breakage of the deterrence wire, and at the time of periodic inspection, It is possible to provide a double torsional damper that can easily detect an abnormality in a deterrence line and replace it.

DESCRIPTION OF SYMBOLS 10 Deterrence line 10-1-3 Deterrence line by this invention 11 Peripheral line 12 Thin line 14 Peripheral line which has a high fatigue limit 16 Composite twisted wire 20 Weight 25 Adhering part 30 Clamp | clamp for electric wire holding 35 Clamp part 37 Inhibition line compression hole 40 Overhead wire 50 Conventional deterrence wire 51 Core wire 52 Peripheral wire 100 Double torsional damper according to the present invention 110 General double torsional damper α Bending angle

Claims (4)

In a double torsional damper comprising a restraining wire, a weight secured to both ends of the restraining wire, and an electric wire gripping clamp secured to a central portion of the restraining wire,
The inhibition wire is composed of a core wire having the same outer diameter and a plurality of outer peripheral lines, and is configured by twisting the plurality of outer peripheral lines around the core wire,
A fine wire is incorporated along the groove formed by twisting the outer peripheral wire,
The double torsional damper characterized in that the incorporated thin wire has a slack in a central portion between the weight of the outer peripheral line and the wire gripping clamp.   The double torsional damper according to claim 1, wherein the thin wire is a composite twisted wire or a stainless steel wire.   3. The fatigue limit of one of the outer peripheral lines formed by twisting the plurality of outer peripheral lines around the core wire has a higher fatigue limit than the other outer peripheral lines. Double torsional damper.   The double torsional damper according to claim 1, wherein the core wire is a composite stranded wire.

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