JP6545331B1 - Ground roller for preventing induction disaster - Google Patents

Abstract

An object of the present invention is to make it possible to safely and easily attach a grounding roller used for overhead wire construction to a power transmission line. A transmission roller 3 and a ground wire 31 are attached to the tip of a control rod 2 made of an insulator. The transmission roller 3 is on the axial center side. 3 rollers having a concave surface. The respective rollers are arranged in a triangular shape in a front view with their circumferential surfaces facing each other, and two pressing rollers among the three rollers maintain a distance from each other, and the other one pulling roller is the operating rod By advancing and retracting toward the middle point of the two pressing rollers by the hand operation, the power transmission line 9 is gripped at three points between the circumferential surfaces thereof in a movable state in the line length direction. [Selected figure] Figure 3

Description

  The invention disclosed in the present application relates to a grounding roller for preventing an induction disaster which is attached to a power transmission line in operation in order to release an induced current at the time of construction of an overhead power transmission line.

  Even when power transmission of the transmission line to be worked is stopped during extended work / overhaul work for overhead power transmission lines, maintenance workers may be at risk of electric shock due to the induced current induced from the existing parallel live lines. is there. In order to prevent such an induction disaster, it is necessary to ground the transmission line to be worked in advance to a steel tower or the like to release the induction current. A grounding tool used for that purpose is of a type in which a hook-like or tulip-like metal grasping tool is attached to the tip of an operating rod made of an insulator, and the grounding wire extended from the grasping tool is shorted to the tower side. Things (for example, patent documents 1-3 etc.) are known. These are used in such a manner that the operating rod is extended from above the arm of the steel tower and the holding tool is attached to a jumper wire, an arc horn or the like.

  Also, as a grounding tool used for the extension line work of the transmission line, a grounding roller is attached to a transmission line guiding metal wheel suspended on an arm of a steel tower, the grounding roller is brought into contact with the transmission line, and the grounding roller The type (for example, patent documents 4-6 etc.) of the type which short-circuits the grounding wire extended from it to the steel tower side is known.

  There is also a type of ground roller (e.g., Patent Document 7) which can be separated independently from a gold car and delivered independently to any position of the transmission line.

JP 7-123552 A JP 2000-278830 A JP, 2013-13173, A Japanese Utility Model Application Publication No. 58-176517 Unexamined-Japanese-Patent No. 9-182226 gazette JP 2002-345118 A Japanese Utility Model Publication No. 58-176516

  In the case of the extension and replacement of the transmission line, after extending the transmission line across the entire length, fix the transmission line to the insulator of the steel tower while adjusting the sag between each section in order. In this stringing operation, it is necessary for the worker to run out on the transmission line side and directly touch the transmission line, so that the induction current of the transmission line must be dissipated in advance.

  However, in the case of the grounding tool having the hook-like or tulip-like gripping tool attached to the tip of the operating rod as disclosed in Patent Documents 1 to 3, the gripping position by the gripping tool is fixed. It is not possible to follow the movement in the line length direction by the loading of the transmission line at the time of work. In addition, the grounding rollers of the types disclosed in the above-mentioned Patent Documents 4 to 7 are also dangerous because it is necessary for an operator to approach the power transmission line and manually hand over the power transmission line when attaching them. It can not exclude sex enough.

  The invention disclosed in the present application has been made in view of such circumstances, and the problem to be solved is that the overhead transmission line can be attached to the transmission line without directly touching the transmission line when the overhead transmission line is constructed, and the transmission line The present invention is to provide a ground roller capable of following the movement of the roller in the line length direction.

  In order to solve the above-mentioned problems, in the grounding roller for preventing induction disaster according to the invention disclosed in the present application, a power transmission wire grasping tool made of a conductor and a ground wire are attached to the tip of an operating rod made of insulator. The holding tool comprises three rollers rotatably held at the tip of the operating rod, and each of the rollers has a circumferential surface recessed toward the axial center, and the circumferential surfaces are made to face each other Are arranged to form a triangular shape in a front view, and two of the three rollers maintain a distance from each other, and the other one of the three The basic configuration of gripping the power transmission line between the circumferential surfaces of the three rollers by moving to and from the middle point of the rollers is adopted.

  More specifically, the power transmission line holding tool has a neck portion extending from the tip end of the operation rod, and two pressing rollers at the tip end of the neck portion and an axial center of the neck portion The presser frame comprises a presser frame arranged and held in an orthogonal direction, and a draw-in arm holding one draw-in roller further ahead than the presser frame, the draw-out arm advancing and retracting along the neck shaft By adopting this configuration, the drawing roller and the pressing roller are brought into contact with and separated from each other.

  Furthermore, a male screw is provided on the circumferential surface of the neck shaft, and a female screw provided on the pulling arm is screwed into the male screw of the neck, and the pulling arm and the pressing frame Are engaged so as to be mutually translatable along the axial direction of the neck with the mutual rotation in the direction around the axis of the neck restricted, and when the operating rod is rotated about the axis A configuration is adopted in which the pulling arm moves back and forth along the neck portion.

  Further, a configuration is adopted in which the pressing frame is attached to the tip end of the neck portion via biasing means to the pushing side.

  Further, the neck shaft portion is attached to a tip end portion of the operation rod via a universal joint.

  According to the grounding roller for preventing induction disasters adopting the above-mentioned configuration, the operator puts out the operating rod from the arm of the steel tower, grasps the transmission line with the transmission wire holding tool attached to the tip, and By moving the three rollers close to each other by the hand operation, the power transmission line can be gripped between the three rollers in a state where it can be moved in the line length direction. Therefore, grounding work can be performed safely and easily without directly touching the power transmission line, even at a position slightly away from the tower arm. Thus, the invention disclosed in the present application greatly contributes to the prevention of induced disasters during wire connection construction.

It is a front view of a grounding roller for prevention of an induction disaster which this application discloses. It is a side view of the said contact roller for prevention of an induction disaster. It is a principal part front view of a state where a power transmission line was grasped by the grounding roller for prevention of induction disasters. It is a principal part side view in the state where a power transmission line was grasped with the grounding roller for prevention of induction disasters.

  Hereinafter, embodiments of the invention disclosed by the present application will be described with reference to the drawings.

  1 to 4 show an embodiment of a grounding roller for preventing an induction disaster disclosed in the present application. In the following description, when specifying the positional relationship and orientation of the parts and members, the vertical direction and the horizontal direction are specified with the state shown in FIG. 1 as a reference (front).

  The induction disaster preventing ground roller 1 has a power transmission line holding tool 3 made of a conductor attached to the tip (lower end) of a control rod 2 made of an insulator. One end of a ground line 31 is connected to the power transmission line holding tool 3, and the other end of the ground line 31 is connected to a steel tower (not shown) or the like through a clip member (not shown) made of a conductor or the like. Ru.

  For the control rod 2, for example, an FRP pipe material in which glass fiber is mixed in polyester resin can be suitably used. The control rod 2 is formed to a length (1 to 3 m) that allows the operator to easily maneuver on the arm of the steel tower, but can be extended or retracted so that the length can be adjusted according to the situation at the work site. It may be a supplementary type.

  The power transmission line holding tool 3 is substantially entirely made of metal, and the neck shaft 4 extending from the tip end of the operation rod 2 and the tip end of the neck shaft 4 can rotate two pressing rollers 50, 50. And a pulling arm 6 rotatably holding one pulling roller 60 on the further front side than the pressing frame 5.

  The neck portion 4 is a rod-like body provided with a male screw portion on the circumferential surface, and in the illustrated embodiment, a screw rod having a square screw or a trapezoidal screw formed over substantially the entire length is used. The proximal end of the neck portion 4 is connected to a cap member 71 fitted to the tip of the operation rod 2 via a universal joint (universal joint) 72. As a result, the neck portion 4 can swing about several tens of degrees in all directions about the axis center extension line of the operating rod 2, and when the operating rod 2 is twisted around the axis, the rotation is the neck axis It is held to be transmitted also to the part 4. The universal joint 72 may be provided with locking means (not shown) capable of restraining the movement of the movable node as required.

  The pressing frame 5 is, for example, a member formed by bending a metal plate into a U-shape in a side view, and the rectangular base portion 51 located in the middle portion and the opposing two sides of the base portion 51 to the base portion 51 A pair of front and rear bearing portions 52 extending in orthogonal directions and facing each other are provided.

  The base 51 is attached to the tip of the neck 4 in a posture perpendicular to the axial center of the neck 4 and held so as to be able to rotate around the axis of the neck 4. In the illustrated embodiment, a double-tube type shock absorber 73 in which a coil spring is inserted between the tip end of the neck portion 4 and the base 51 is interposed, and the shock absorber 73 always keeps the base 51 , And the pushing side (in the direction away from the neck 4).

  The bearing portion 52 is extended so as to widen laterally in the front view (FIG. 1) than the base portion 51, and supporting shafts 53, 53 of the pressing roller 50 are attached near both ends thereof. The two support shafts 53, 53 are arranged symmetrically with respect to the axis center extension line of the neck portion 4, and are arranged to be orthogonal to the axis center extension line of the neck portion 4 in a side view (FIG. 2) .

  The pressure roller 50 has a smooth circumferential surface recessed toward the axial center, with the same shape and size in both of the two. The circumferential surface of the illustrated embodiment has a V-shaped corner in a side view, but may have a U-shape, a semi-elliptic shape, or the like. These pressing rollers 50, 50 are attached to the support shafts 53, 53 of the bearing 52, respectively, with their circumferential surfaces facing each other. An interval slightly smaller than the outer diameter of one pressing roller is provided between both pressing rollers 50, 50.

  The pulling arm 6 includes a base portion 61 attached to the neck portion 4 and an arm portion 62 extending from the base portion 61 in the axial center extension direction of the neck portion 4. In the illustrated embodiment, a member formed by connecting two stiffening ribs 63 to the back side of a metal plate bent in a side view L shape is used, the short side of which is a base 61 and the long side is an arm 62 It has become.

  A sleeve-shaped nut member 64 having an internal thread portion that can be screwed to the external thread portion of the neck portion 4 is coupled to the base portion 61. The nut member 64 is attached to the neck portion 4 and held so as to be movable in the axial direction of the neck portion 4 within a range between the universal joint 72 and the shock absorber 73.

  The arm portion 62 extends further from the back side of the pressing frame 5 beyond the pressing rollers 50, 50, and the support shaft 65 of the pulling roller 60 is attached in the vicinity of the tip thereof. The support shaft 65 is disposed on the axial center extension line of the neck shaft 4 so as to be orthogonal to the axial center extension line of the neck shaft 4 in a side view (FIG. 2). The pulling roller 60 has the same shape and size as the pressing roller 50, and the shape of the circumferential surface is also the same as the pressing roller 50.

  In the middle portion of the arm portion 62, a slot 66 elongated in parallel with the axis center extension line of the neck portion 4 is formed. An engaging pin 54 protruding from a central portion of the bearing portion 52 on the back surface side of the pressing frame 5 is inserted into the groove 66, and a retaining nut 55 is fastened at the tip thereof. By this engagement form, the mutual rotation of the pressing frame 5 and the pulling arm 6 in the periaxial direction of the neck shaft 4 is restrained, and the pressing frame 5 and the pulling arm 6 are in the axial direction of the neck shaft 4 Can be translated parallel to each other.

  For example, the grounding roller 1 for preventing an induction disaster configured as described above is used as follows. The operator holds the power transmission line holding tool 3 in advance and rotates it around the axis of the neck portion 4 to move the nut member 64 of the pull-out arm 6 toward the tip end of the neck portion 4. , 50 and the distance between the pulling roller 60 are extended. Also, the ground wire 31 is connected in advance to an arm or the like of the steel tower.

  Then, hold the base end side of the operating rod 2 on a safe scaffold, direct the tip to the power transmission line 9 to be grounded, and place the power transmission line 9 between the pressing rollers 50, 50 and the pulling roller 60. capture. If the control rod 2 is rotated about the axis as it is, the neck portion 4 is also rotated about the axis, and the nut member 64 screwed to the neck portion 4 moves to the control rod 2 side and the pull-out arm 6 is pulled. Thus, the distance between the pressing rollers 50, 50 and the pulling roller 60 is narrowed.

  As shown in FIGS. 3 and 4, the pulling roller 60 approaches the middle point between the two pressing rollers 50, 50, the power transmission line 9 is gripped at three points, and the shock absorber 73 is appropriately compressed. If it is, the grounding operation is complete. Thus, the induced current of the transmission line 9 can be released safely and easily without approaching the transmission line 9. In a state where the power transmission line gripping tool 3 properly holds the power transmission line 9, the three rollers move the power transmission line 9 smoothly in the line length direction and buffer when the power transmission line 9 is picked up or shaken. The biasing force of the device 73 prevents detachment of the transmission line 9 and the universal joint 72 also follows the movement of the transmission line 9. After the completion of the stringing operation and the hovering operation, the transmission line holding tool 3 can be safely and easily removed from the transmission line 9 in the reverse procedure to the above.

  Thus, the invention disclosed in the present application greatly contributes to the prevention of induced disasters during wire connection work, especially during stringing work, and work such as direct contact with electric wires such as in the case of suspension work. However, the technical scope of the invention disclosed in the present application should not be construed as being limited by the illustrated embodiments, and should be conceptually interpreted based on the recitation of the claims. In the practice of the invention disclosed in the present application, the shapes, structures, dimensions, positional relationships, joining configurations, etc. of members and parts not specifically specified in the claims have substantially the same effects and effects as the illustrated embodiment. In the range which is obtained, it can modify suitably and can carry out.

  For example, the basic configuration of the grounding roller 1 for preventing an induction disaster disclosed in the present application is directed to the middle point of two rollers arranged so that three rollers form a triangular shape in a front view and keeping a distance between each other. The power transmission line is gripped at three points by advancing and retracting another roller. Therefore, instead of the illustrated embodiment, it is also possible to adopt a configuration in which one pressing roller disposed on the operation rod 2 side and two drawing rollers disposed on the tip end are disposed in a triangle shape.

  Also, in the illustrated embodiment, the shapes and sizes of the three rollers are the same, but the sizes of the two rollers and one other roller may be different.

  Further, the mechanism for bringing the pressing frame into contact with or away from the pulling arm by the hand operation of the operating rod is not limited to the mechanism using the illustrated screw rod and nut member, but other mechanisms for generating similar operations are appropriately It can also be adopted.

DESCRIPTION OF SYMBOLS 1 Induction disaster prevention ground roller 2 Control rod 3 Transmission line holding tool 31 Ground wire 4 Neck shaft 5 Press frame 50 Press roller 51 Base 52 Bearing 53 Support shaft 54 Engage pin 55 Stop nut 6 Pull arm 60 Draw-out roller 61 base 62 arm portion 63 stiffening rib 64 nut member 65 support shaft 66 groove hole 71 cap member 72 universal joint 73 shock absorber 9 power transmission line

Claims (5)

Attached to the tip of the operating rod made of an insulator are a power transmission line holding tool made of a conductor and a grounding wire.
The power transmission line holding tool comprises three rollers rotatably held at the tip of the operation rod,
Each of the rollers has a circumferential surface recessed toward the axial center, and the circumferential surfaces are arranged to face each other to form a triangular shape in a front view,
Two rollers out of the three rollers keep a distance from each other, and another one roller advances and retracts to the middle point of the two rollers by the hand operation of the operating rod. A grounding roller for preventing an induction disaster characterized by gripping a power transmission line between the circumferential surfaces of three rollers. In the grounding roller for preventing induction disaster according to claim 1,
The power transmission line holding tool holds a neck shaft extending out from the tip of the operation rod, and holds two pressing rollers at the tip of the neck in a direction perpendicular to the axis of the neck. And a pulling arm for holding one pulling roller further ahead of the pressing frame,
The grounding roller for preventing an induced disaster according to claim 1, wherein the pulling roller and the pressing roller move close to each other as the pulling arm moves back and forth along the neck shaft. In the grounding roller for preventing induction disaster according to claim 2,
An external thread is provided on the circumferential surface of the neck portion,
An internal thread portion provided on the pulling arm is screwed into an external thread portion of the neck portion,
The pulling arm and the pressing frame are engaged so as to be able to mutually translate along the axial direction of the neck portion in a state in which mutual rotation in the circumferential direction of the neck portion is restrained. ,
The ground contact roller for preventing an induction disaster, wherein the pulling arm moves back and forth along the neck portion when the operating rod is rotated about an axis. In the grounding roller for preventing induction disaster according to claim 3,
The grounding roller for preventing an induced disaster is characterized in that the pressing frame is attached to a tip end of the neck portion via biasing means to the pushing side. In the grounding roller for preventing induction disaster according to claim 2, 3 or 4,
The grounding roller for preventing an induced disaster is characterized in that the neck portion is attached to a tip of the operating rod via a universal joint.

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