JP7807267B2 - Slide aid for overhead power line grounding tools - Google Patents

Description

This invention relates to an auxiliary tool used during overhead power line construction to prevent electric shock accidents caused by residual voltage due to electrostatic induction on the power line. The tool operates a long insulated operating rod with a ground clamp at its tip, which is connected to a ground wire connected to the tower, and moves along the insulator string that secures the power line to the tower, connecting the ground clamp to the power line.

A grounding tool for grounding a power line that has been cut off during work such as replacement or repair of the overhead power line is grounded via the steel tower to which the overhead power line is attached. This type of grounding tool is equipped with a grounding clamp at the tip of an extendable insulating control rod that grips the power line or its surrounding metal fittings, and is used by connecting a grounding wire connected to the grounding clamp to the steel tower. Because the overhead power line is attached to the steel tower via a pair of parallel insulator strings each consisting of a number of insulators, the grounding tool is equipped with an auxiliary tool that guides the insulating control rod along the insulator strings so that the grounding clamp at the tip can be aimed at a gripping position for the power line, etc.
Conventional auxiliary tools, as described in Patent Documents 1 to 4, include a sliding member that slides along the insulator string while moving between the insulators, and an attachment member that allows an insulating operating rod to be attached and detached to the sliding member. The tip of the sliding member is curved with a bulge toward the insulator string, and is inclined along the side of the insulator string to restrict lateral movement.

Japanese Utility Model Application Publication No. 61-108007 Japanese Utility Model Application Laid-Open Publication No. 01-127313 Japanese Utility Model Application Laid-Open Publication No. 04-043321 Publication number 07-047929

In the auxiliary tool attached to the above-mentioned conventional insulating control rod, the connection destination of the ground clamp is a metal fitting such as a transmission line or a nearby arcing horn, so the connection height varies, the long insulating control rod bends, and the vertical angle between the insulating control rod and the insulator string changes depending on the distance traveled on the insulator string, making it difficult to adjust the connection position of the ground clamp at the tip of the insulating control rod up and down from the limited work space on the tower. Grounding work is usually performed by standing at the tip of the tower arm (the insulator string retention part). However, if there is not enough space for the worker to stand, the insulating control rod is extended diagonally from a position close to the tower on an arm extending laterally from the tower toward the insulator string, but because the insulating control rod and the sliding member are fixed by a mounting member, it is difficult to approach the connection destination of the ground clamp with the insulating control rod. Because the sliding member is placed on a pair of parallel insulator strings, it is not possible to adjust the engagement means to prevent lateral movement on-site to accommodate the different spacing between the insulator strings depending on the tower. The insulation control rod has a telescopic structure, and because the diameters of each part vary, the attachment points to the insulation control rod are limited, which can lead to deviations from the appropriate attachment position. If the attachment position could be changed, it would be useful to use a common insulation control rod even if the height of the connection point or the flexibility of the insulation control rod changes, or even if the hand position varies depending on the physique of the worker. When transporting auxiliary tools to the tower, the worker climbing the tower can easily carry them up, but because the dimensions of the sliding member are fixed in advance according to the spacing between the insulator strings, if the outer diameter increases to match the spacing between the insulator strings, the auxiliary tool must be lifted using a pulley and rope. It is not easy to attach the fastener for fixing the insulating control rod to the auxiliary tool with the appropriate gripping force, and excessive tightening may damage the insulating control rod, or incomplete fixation may hinder the movement of the insulating control rod.
Therefore, the present invention aims to provide a slide aid that can adjust the mounting height of the grounding tool, tilt the grounding tool up and down, and rotate it horizontally, thereby allowing the attached insulating operating rod to move smoothly over the insulator string, thereby facilitating approach to the connection destination and making grounding work more efficient.

To solve the above problems, the sliding aid for the overhead power line grounding tool of the present invention grounds a power line attached to a steel tower via a pair of parallel insulator strings G, each stringing together a large number of insulators G1. The insulating control rod E1 is extendable and has a grounding clamp at its tip, to which a grounding wire is connected. The grounding clamp is guided along the insulator strings G toward the power line or a gripping position nearby. The sliding aid 1 comprises a sliding part 2 that slides on the insulator strings G while moving between the insulators G1, G1, and an attachment part 3 that is connected to the sliding part 2 and to which the insulating control rod E1 can be attached and detached. The sliding section 2 includes a pair of sliding plates 4, both ends of which are inclined away from the insulator string G, with at least one side inclined to engage with the side of the insulator string G, allowing the sliding plates 4 to move along the insulator string G while being constrained from lateral movement as the insulating control rod E1 is pushed out, and a connecting member 5 that spans between the sliding plates 4, 4 and connects them. The mounting section 3 includes a base 6 fixed to the connecting member 5, a mounting clamp 7 that grips the insulating control rod E1, and a support member 8 that supports the mounting clamp 7 on the base 6 so that it can be adjusted in height, tilted up and down, and rotated horizontally.

According to the present invention, the mounting height of the grounding tool can be adjusted, the grounding tool can be tilted up and down, and it can be rotated horizontally. This allows the device to be tilted horizontally and vertically relative to the attached grounding tool, allowing the grounding tool to be moved smoothly on the insulator string, facilitating the approach operation of the grounding tool toward the connection position of the ground clamp and improving the efficiency of grounding work.

FIG. 1 is a perspective view of a slide assisting tool according to the present invention. FIG. 2 is a front view of the slide assisting tool of FIG. 1 . FIG. 2 is a side view of the slide assisting tool of FIG. 1 . FIG. FIG. FIG. FIG. 10 is a side view of the mounting clamp. FIG. 10 is a perspective view of a positioning clamp. FIG. 10 is a front view of the positioning clamp.

An embodiment of the present invention will be described with reference to the drawings.
1, a slide assisting tool 1 slides on a pair of parallel insulator strings G, each string consisting of a number of insulators G1 that fasten the transmission line to the pylon, to guide the grounding clamp of the grounding tool E from the pylon side to the transmission line side. The grounding tool E has a grounding clamp (not shown) at its tip that electrically connects to a peripheral conductor such as a transmission line or an arcing horn, and is equipped with an insulating operating rod E1 from which a grounding wire (not shown) that is connected to the pylon T is drawn out, and the grounding clamp is gripped onto the connection target by opening and closing the insulating operating rod E1 at the hand.

As shown in Figures 1 to 3, the slide assist device 1 comprises a sliding part 2 that slides along the insulator string G while spanning between the umbrella parts of the insulators G1, and an attachment part 3 that is connected to the sliding part 2 approximately midway and to which the insulating operating rod E1 can be attached and detached.

The sliding section 2 comprises a pair of parallel sliding plates 4, 4 made of smooth FRP, and a connecting member 5 that spans between and connects these sliding plates 4, 4. The sliding plate 4 has a warped portion 4a that slopes away from the insulator string G toward its tip, and an engaging portion 4b that slopes along the opposing sides of the insulator string G to prevent lateral movement. The connecting member 5 consists of a pair of elongated plates with an L-shaped cross section that extend in the direction of the alignment of the sliding plates 4 and are parallel from front to back. The connecting member 5 has elongated holes 5b through which butterfly bolts 5a that are fastened to the sliding plates 4 are inserted, allowing the fixed position relative to the sliding plates 4 to be adjusted. Note that the elongated holes 5b may be replaced with multiple through holes through which butterfly bolts 5a can be inserted, as long as the fixed position relative to the sliding plates 4 can be adjusted.

The mounting section 3 comprises a base 6 that spans between the connecting members 5, 5 and is secured with bolts, a mounting clamp 7 that holds the insulating control rod E1, a support member 8 that supports the mounting clamp 7 on the base 6, and positioning clamps 9 that hold the insulating control rod E1 in front of and behind the mounting clamp 7 and restrict movement of the insulating control rod E1.

The stand 6 comprises a support plate 10 whose both side edges are bolted to the connecting members 5, and a bracket 11 that rises vertically from the middle of the support plate 10.

6 and 7, the mounting clamp 7 comprises a bearing plate 12 with a generally U-shaped cross section, a pair of mounting clamp pieces 13, 14 that are vertically rotatably supported by a horizontal shaft between both ends of the raised piece of the bearing plate 12 and have gripping recesses along the outer periphery of the insulated operating rod E1, and whose tips face each other so that they can be opened and closed, and a first locking member 15 that holds the mounting clamp pieces 13, 14 in the gripping position. The base of the first locking member 15 is vertically rotatably supported by a horizontal shaft at the tip of one of the mounting clamp pieces 13, and comprises a threaded shaft 15a, which is a first screw that is inserted into an engagement recess 14a that opens at the tip of the other mounting clamp piece 14 when the mounting clamp pieces 13, 14 approach each other, and a screw tube 15b, which is a second screw that threads into the tip of the threaded shaft 15a and presses the mounting clamp pieces 13, 14 together when tightened onto the threaded shaft 15a. A pair of opposing semi-cylindrical synthetic resin adjustment collars 16, corresponding to the diameter of the insulated operating rod E1, are bolted to the inside of the mounting clamp pieces 13, 14 to prevent damage to the insulated operating rod E1 caused by gripping the mounting clamp pieces 13, 14. Note that the screw shaft 15a and the threaded tube 15b may be interchangeable due to their threaded engagement.

The support member 8 is equipped with a height adjustment plate 17 that is inserted into the vertical fitting gap 11a of the bracket 11 and is passed horizontally together with the bracket 11 by a pivot pin 18, and a clevis 20 that is passed through the upper end of the height adjustment plate 17 together with a horizontal shaft 19 so that it can rotate vertically and is secured with a nut, connecting the height adjustment plate 17 to the mounting clamp 7. The height adjustment plate 17 has multiple vertically aligned pin holes 17a for height adjustment in its horizontal center, through which the pivot pins 18 can be inserted and removed. The clevis 20 is continuous with a vertical shaft 21 that passes vertically through the bearing plate 12 and is secured so that it can rotate horizontally.

8 and 9, the positioning clamp 9 is attached adjacent to the adjustment collars 16 that protrude from both the front and rear of the mounting clamp 7 on the insulating control rod E1, preventing relative movement of the insulating control rod E1 from the mounting clamp 7. The positioning clamp 9 has a gripping recess along the outer periphery of the insulating control rod E1 and is connected to each other by a horizontal shaft so that it can rotate vertically. It is equipped with a pair of synthetic resin positioning clamp pieces 22, 23 whose tip ends face each other and can be opened and closed, and a clamp lever 24, which serves as a second locking means for holding the positioning clamp pieces 22, 23 in the gripping position. The positioning clamp piece 23 has an engaging recess 23a that opens at the tip and a notch 23b that thins the tip. The clamp lever 24 comprises a screw cylinder 24a, which is a first screw whose base is supported vertically rotatably on the tip of one of the positioning clamp pieces 22, a screw shaft 24b, which is a second screw whose one end is threadedly engaged with the screw cylinder 24a and inserted into the engagement recess 23a by rotation of the screw cylinder 24a, and whose other end has a knob 24d fixed thereto that abuts against the notch 23b, and a spring 24c provided around the screw shaft 24b together with a spring cover 24e. The clamp lever 24 moves back and forth along the screw cylinder 24a by rotating the screw shaft 24b about its axis, thereby tightening or loosening the positioning clamp pieces 22, 23. The spring 24c is engaged between the knob 24d and the inner end of the spring cover 24e on the positioning clamp piece 23 side. When the threaded shaft 24b and the engagement recess 23a are engaged, tightening the knob 24d applies spring force equivalent to the contracted length as a gripping force for the positioning clamp pieces 22, 23. When the threaded shaft 24b and the engagement recess 23a are initially engaged, the spring 24c is in an uncompressed state, leaving a gap between the positioning clamp piece 23 and the spring cover 24e that exposes the threaded shaft 24b. However, when the knob 24d is tightened, the spring cover 24e abuts against the positioning clamp piece 23, further compressing the spring 24c and pushing the positioning clamp piece 23 toward the positioning clamp piece 22, gripping the insulated operating rod E1. Note that the threaded tube 24a and the threaded shaft 24b may be interchanged due to their threaded engagement.

When using the grounding tool E to ground a power line, this slide assist device 1 adjusts the position of the butterfly bolt 5a within the long hole 5b, aligning the spacing between the engaging portions 4b, 4b of the pair of sliding plates 4, 4 with that of the insulator strings G, G, and then fixes them in place. Depending on the connection position of the grounding clamp, the pin hole 17a of the height adjustment plate 17 is appropriately selected and the pivot pin 18 is passed through to adjust the installation height of the insulation control rod E1.

Next, select an appropriate mounting position on the insulating operating rod E1, clamp the insulating operating rod E1 between the mounting clamp pieces 13 and 14 of the mounting clamp 7, tilt the locking member 15, insert the screw shaft 15a into the engagement recess 14a of the mounting clamp piece 14, and tighten the screw tube 15b.The mounting clamp pieces 13 and 14 then firmly grip the insulating operating rod E1 via the adjustment collar 16.

Next, the front and rear sides of the adjustment collar 16 on the insulating operating rod E1 are clamped between the positioning clamp pieces 22, 23 of the positioning clamp 9, and the clamp lever 24 is tilted down to press the screw tube 24a into the engagement recess 23a of the positioning clamp piece 23. The positioning clamp pieces 22, 23 then firmly grip the insulating operating rod E1, preventing misalignment of the insulating operating rod E1 with the mounting clamp 7. When the screw tube 24a is inserted into the engagement recess 23a of the positioning clamp piece 23 and the screw shaft 24b is tightened, the clamp lever 24 elastically grips the positioning clamp pieces 22, 23 with spring force, easily preventing slippage due to insufficient tightening of the insulating operating rod E1 and damage due to over-tightening.

After connecting the grounding wire to the tower, the slide assist device 1 with the grounding tool E attached is placed on the insulator string G. The insulating control rod E1 is then pushed out, causing the slide assist device 1 to move smoothly over the insulator string G and guide the grounding clamp to the connection position. The support member 8 supports the mounting clamp 7 on the sliding part 2 so that it can rotate up and down using the connection bolt 20, and also swivels using the rotation shaft 21. This allows for a wide range of relative tilt of the slide assist device 1 with respect to the insulating control rod E1, regardless of the flexure of the long insulating control rod E1, the distance traveled over the insulator string G, or the worker's holding position.

REFERENCE SIGNS LIST 1 slide auxiliary tool 2 sliding portion 3 mounting portion 4 sliding plate 4a warped portion 4b engaging portion 5 connecting member 5a butterfly bolt 5b elongated hole 6 mount 7 mounting clamp 8 support member 9 positioning clamp 10 support plate 11 bracket 11a fitting gap 12 bearing plate 13 mounting clamp piece 14 mounting clamp piece 14a engaging recess 15 locking member 15a screw shaft 15b screw cylinder 16 adjustment collar 17 height adjustment plate 17a pin hole 18 pivot pin 19 horizontal shaft 20 clevis 21 vertical shaft 22 positioning clamp piece 23 positioning clamp piece 23a engaging recess 23b notch portion 24 clamp lever 24a screw cylinder 24b screw shaft 24c spring 24d knob 24e spring cover G insulator string G1 Insulator E Grounding tool E1 Insulated operating rod

Claims (8)

In order to ground a transmission line fastened to a steel tower via a pair of parallel insulator strings each having a number of insulators connected thereto, an extendable insulating operating rod is provided at its tip with a grounding clamp to which a grounding wire is connected, and the insulating operating rod is guided along the insulator strings toward a gripping position on or near the transmission line,
a sliding portion that slides on the insulator string while passing between the insulators;
a mounting portion coupled to the sliding portion and to which the insulating operating rod can be detachably attached,
the sliding portion comprises a pair of sliding plates, both ends of which are inclined in a direction away from the insulator string, and at least one of which has a side portion inclined so as to engage with a side portion of the insulator string, and which move along the insulator string while being constrained from moving sideways as the insulating operating rod is pushed out;
a connecting member that connects the sliding plates and extends between them,
The mounting portion includes a base fixed to the connecting member;
a mounting clamp that holds the insulating operating rod;
A slide auxiliary device for an overhead power line grounding tool, characterized in that it comprises a support member that supports the mounting clamp on the base so that it can be adjusted in height, tilted up and down, and rotated horizontally. The sliding aid for an overhead power transmission line grounding tool described in claim 1, characterized in that the connecting member is attached to at least one of the sliding plates in such a way that its attachment position can be changed in the spacing direction of the sliding plates, allowing the spacing between the sliding plates to be adjusted. the support member has a pivot part at its upper part that supports the mounting clamp, and a pivot part below the pivot part that is supported by the base,
a pivot pin that penetrates through at least one of the upper and lower pivot portions together with the base or the mounting clamp;
3. The slide assisting device for an overhead power transmission line grounding tool according to claim 1, further comprising a height adjusting plate having a plurality of pin holes arranged in the vertical direction, through which the pivot pin can be freely inserted and removed. The support member includes a horizontal shaft that supports the mounting clamp so that the mounting clamp can rotate up and down;
4. The slide assisting tool for an overhead power transmission line grounding tool according to claim 1, further comprising a vertical shaft for supporting the mounting clamp so that the mounting clamp can be turned horizontally. The mounting clamp includes a pair of opposing mounting clamp pieces that grip the insulating operating rod;
a first locking means for fixing the pair of mounting clamp pieces at a gripping position of the insulating operating rod;
The first locking means includes a first screw whose base end is rotatably supported on the tip end of one of the mounting clamp pieces and which is engageable with the other mounting clamp piece;
A slide assisting device for an overhead power transmission line grounding tool as described in any one of claims 1 to 4, characterized in that it is provided with a second screw that is threaded onto the first screw and that, when tightened, presses the other side of the mounting clamp piece toward one side. The slide assisting device for an overhead power transmission line grounding tool as described in claim 5, characterized in that it is provided with collars that are removably fixed to the opposing portions of the pair of mounting clamp pieces so as to surround the insulating operating rod. A slide assist device for an overhead power transmission line grounding tool as described in any one of claims 1 to 6, characterized in that it is provided with a pair of positioning clamps that grip the front and rear sides of the mounting clamp on the insulating control rod and prevent relative movement between the mounting clamp and the insulating control rod. The positioning clamp includes a pair of opposing positioning clamp pieces that grip the insulating operating rod;
and second locking means for fixing the pair of positioning clamp pieces at the gripping positions of the insulating operating rod,
The second locking means includes a first screw whose base end is rotatably supported on the tip end of one of the positioning clamp pieces;
a second screw that threads onto the first screw, extends, and is engageable with an engaging recess at the tip of the other positioning clamp piece, and that pushes the other positioning clamp piece toward the first positioning clamp piece when tightened;
8. A slide assisting device for an overhead power transmission line grounding tool as described in claim 7, characterized in that it is further provided with a spring that is compressed between the other positioning clamp piece by tightening the second screw, thereby tightening the positioning clamp by the contracted length and applying a gripping force to the insulating operating rod.