JP2007221998A - Vernier fittings - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vernier fittings which can additionally reduce cost and can improve workability. <P>SOLUTION: The vernier fittings 1 is provided in an intermediate manner between a strain clamp holding an overhead power transmission line and an insulator mounted in the supporter of a steel tower or the like. The vernier fittings 1 are constituted by placing an inner side plate 4 in intermediate manner between a pair of outer side plates 2,3 to make mutually position adjustable in the lengthwise direction so as to make its length adjustable additionally constituted of the outer side plates 2, 3 and the inner side plates 4, made mutually connectable in the prescribed adjustment position. In addition, as the engaging part for engaging an adjustment tool, the outer side plates 2,3 and the inner-side plate 4 are provided with engaging protrusions 2a, 3a and an engaging hole 8, respectively. The engaging protrusions 2a, 3a are formed at point ends of the outer-side plates 2, 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vernier fitting used in a tension insulator for adjusting the slackness of an overhead power transmission line.

  FIG. 5 is a top view showing a part of a tension insulator for four conductors. The vernier fitting 40 includes a pair of outer plates 41, 41 and an inner plate 42 interposed between the outer plates 41, 41. The outer plates 41, 41 have a plurality of bolt insertion holes 43 formed at a predetermined pitch on the front end side thereof (see FIG. 6), and are spaced at a predetermined interval so that the bolt insertion holes 43 coincide with each other. The base end portion is attached to the right angle clevis link 45 by a mounting bolt 44.

  On the other hand, the inner plate 4 has a plurality of positioning holes 46 formed on the front end side thereof at a predetermined pitch (see FIG. 7), and the outer plate 41 can communicate with the bolt insertion holes 43. , 41, and its base end is attached to a right angle clevis link 48 by means of a mounting bolt 47. The pitch of the positioning holes 46 is selected to be different from the pitch of the bolt insertion holes 43.

  The vernier fitting 40 having such a configuration can adjust the positions of the outer plates 41 and 41 and the inner plate 42 in the longitudinal direction, and is provided with connecting bolts 49 in desired bolt insertion holes 43 and positioning holes 46. By penetrating, the outer plates 41 and 41 and the inner plate 42 are connected to each other, and a vernier fitting 40 having a desired length can be obtained. Here, since the bolt insertion holes 43 and the positioning holes 46 are formed at different pitches as described above, the length of the vernier fitting 40 can be reduced by changing the combination of the bolt insertion holes 43 and the positioning holes 46. It can be changed in stages.

  This vernier fitting 40 is used as a component part of a tension insulator that grips an overhead power transmission line on a support such as a steel tower, and is attached to a tension clamp 50 that grips the overhead power transmission line and the support ( (Not shown), and is used to adjust the slackness of the overhead power transmission line by adjusting its length.

  In the vernier fitting 40, the base ends of the outer plates 41 and 41 are connected to both ends of the double yoke 51 by right angle clevis links 45, respectively, and the base ends of the inner plate 42 are right angle clevis links 48 and parallel clevises 52. The clevis link 53 is connected to the proximal end of the tension clamp 50. The tension clamp 50 holds a power transmission line (not shown) at the tip side. Similarly to the above, the vernier fitting 40, the tension clamp 50, and the like are connected to both ends of another two-yoke 54 arranged below the two-yoke 51, respectively. Therefore, the tension insulator shown in FIG. 5 holds four power transmission lines.

  Further, the double yokes 51 and 54 are respectively connected to the upper end and the lower end of a double yoke 55 extending in the vertical direction, and the double yoke 55 is connected to an insulator (not shown) by a connecting metal fitting.

  6 and 7 are side views for explaining a method of adjusting the length of the vernier fitting 40. FIG. The length of the vernier fitting 40 is adjusted by attaching the adjustment tool 60. In the adjustment tool 60, support members 62, 63 are swingably attached to both ends of the support rod 61, and the base end side of the double acting cylinder 64 and the piston rod are attached to one end of each of the pair of support members 62, 63. The front end portion side of 65 is swingably attached, and engaging portions 66 and 67 are formed at the other end portions. The adjustment tool 60 is mounted by attaching the engaging portions 66 and 67 to the mounting portions 48a and 45a of the right angle clevis links 48 and 45 from above the vernier fitting 40 so as to be swingable.

  When the piston rod 65 is moved forward after mounting, the support members 62 and 63 swing in the direction in which the engaging portions 66 and 67 are close to each other with the both ends of the support rod 61 as axes, thereby taking in the power transmission line, The tension acting on the vernier fitting 40 will act on the adjusting tool 60, and the vernier fitting 40 will be in a suspended state (see FIG. 7). In this state, the connecting bolt 49 is removed, the bolt insertion hole 43 and the positioning hole 46 are selected and aligned so as to have a desired length, and the connecting bolt 49 is inserted into the selected bolt insertion hole 43 and the positioning hole 46. The outer plates 41 and 41 and the inner plate 42 are connected to penetrate.

Thereafter, the piston rod 65 is retracted so that tension is applied to the vernier fitting 40, and then the adjustment tool 60 is removed and the operation is completed. In addition, as a prior art of the above vernier metal fittings, patent document 1 can be mentioned, for example.
JP-A-7-177627

  When adjusting the slackness using the adjustment tool 60, right angle clevises in which special connection fittings necessary for mounting the adjustment tool 60, that is, mounting portions 45a and 48a, are formed at both ends of the vernier fitting 40. The links 45 and 48 are required, and the cost of the connecting bracket is increased. Further, the lengths of the clevis links 45, 48 are increased by the amount of the attachment portions 45a, 48a, and the tension clamp 50 is installed at a position away from the support. Therefore, the length of the jumper wire connecting between the power transmission line installed by another tension insulator attached to the support is increased, and the cost is increased.

  In addition, when adjusting the sag, it is necessary to perform after the vernier fitting 40 is expected to hang down and the transmission line is taken longer to release the tension on the vernier fitting 40, so that the workability is poor. is there. That is, even when the vernier fitting 40 is extended, it is necessary to take a procedure of once taking in the transmission line, adjusting the vernier fitting 40, releasing the transmission line, and applying the tension again. Even when 40 is contracted, it is necessary to take the procedure of once taking in the transmission line more than the length to be contracted, adjusting the vernier fitting 40, releasing the transmission line, and applying the tension again. It will take.

  The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a vernier fitting that can reduce costs and improve workability.

  Accordingly, the vernier metal fitting according to claim 1 is a vernier metal fitting 1 interposed between a tension clamp 15 holding an aerial transmission line and a insulator attached to a support such as a steel tower, and a pair of outer plates The inner plate 4 is interposed between the two plates 3 and 3 so that the length can be adjusted in the longitudinal direction and the outer plates 2 and 3 and the inner plate 4 are connected to each other at a predetermined adjustment position. Further, on the side surfaces of the outer plates 2 and 3, engaging projections 2 a and 3 a that are engaged with the adjusting tool 20 used for the position adjustment are projected, and the inner plate 4 has A plurality of engagement holes 8 with which the adjustment tool 20 is engaged are provided, and further, the engagement protrusions 2a and 3a of the outer plates 2 and 3 are formed at the front end portion on the inner plate 4 side. Yes.

  The vernier fitting of claim 2 is provided with a plurality of bolt insertion holes 5 in the outer plates 2 and 3 and a plurality of positioning holes 7 in the inner plate 4 in order to adjust the position. The bolt insertion hole 5 and the positioning hole 7 are characterized in that they are formed on the base end side of the outer plates 2 and 3 rather than the engaging projections 2a and 3a of the outer plates 2 and 3.

  According to the vernier fitting of the first aspect, since the adjustment tool is attached to the vernier fitting, a standard linking fitting can be used in place of the special linking fitting, and the component cost can be reduced. In addition, by using a standard connecting bracket that is shorter than a special connecting bracket, the jumper line connecting the transmission lines is shortened, and the cost can also be reduced in this respect. Furthermore, when adjusting the length of the vernier fitting, that is, when adjusting the slackness of the overhead power transmission line, the adjustment tool and the vernier fitting are extended and retracted as much as necessary, so there is no need for trouble. Workability is improved. In addition, since the engagement protrusion of the outer plate is formed at the tip on the inner plate side, the distance between the engagement protrusion and the engagement hole can be reduced, which makes it possible to reduce the size and weight of the adjustment tool. The handling becomes easy and the adjustment work at a high place becomes easy. In addition, only one worker can perform attachment work and adjustment work, and work efficiency can be improved.

  According to the vernier fitting of the second aspect, the bolt insertion hole and the positioning hole for adjusting the position are arranged on the base end side, that is, on the side opposite to the inner plate, with respect to the engagement projection. In the state where the engagement protrusion of the outer plate and the engagement hole of the inner plate are engaged with each other, the bolt insertion hole and the positioning hole are located at positions different from the arrangement position of the adjustment tool. Therefore, the connection work of the adjusted vernier fitting can be facilitated.

  Next, specific embodiments of the vernier fitting of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration of a vernier metal fitting 1 according to an embodiment of the present invention, in which (a) is a top view and (b) is a side view. The vernier fitting 1 includes a pair of outer plates 2 and 3 and an inner plate 4 interposed between the outer plates 2 and 3. The outer plates 2 and 3 are elongated flat plate-like parts, and a plurality of (seven in this embodiment) bolt insertion holes 5a to 5g (reference numeral "5" is used when referring generically) on the tip side. Are formed at a predetermined pitch. The outer plates 2 and 3 are arranged to face each other with a predetermined interval so that the bolt insertion holes 5 coincide with each other, and the base end portions thereof are attached to predetermined connection fittings by attachment bolts 6.

  Further, as shown in FIG. 1 (b), the front side of the outer plates 2 and 3 is formed with a tapered width, and cylindrical engagement protrusions 2a and 3a are formed on the outer surface of the front end part. Is formed. Furthermore, on the upper surfaces 2b and 3b of the outer plates 2 and 3, for example, numbers from “1” to “7” are attached as information for identifying the position of the bolt insertion hole 5 in the present embodiment. This number is attached so as to increase by 1 from the distal end side toward the proximal end side.

  On the other hand, the inner plate 4 is also an elongated flat plate-like component like the outer plates 2 and 3, the width is substantially the same as the outer plates 2 and 3, and the thickness is slightly larger than the outer plates 2 and 3. Yes. The inner plate 4 is formed with a plurality of (9 in the present embodiment) positioning holes 7a to 7i (generally referred to by reference numeral “7”) at a predetermined pitch on the front end side thereof. The pitch of the positioning holes 7 is selected to be different from the pitch of the bolt insertion holes 5. The inner plate 4 is interposed between the outer plates 2 and 3 so that the positioning hole 7 can communicate with the bolt insertion hole 5, and the mounting bolt is inserted into the insertion hole 4a formed in the base end portion thereof. Are attached to a connecting bracket (not shown).

  In addition, a plurality (three in this embodiment) of engagement holes 8a, 8b, and 8c (referred to collectively as reference numeral “8”) are provided between the insertion hole 4a and the positioning hole 7. It is formed with a pitch. Furthermore, on the upper surface 4b of the inner plate 4, as information for identifying the position of the positioning hole 7, for example, in the present embodiment, letters from “A” to “I” are attached from the proximal end side to the distal end side. Has been.

  The vernier fitting 1 having such a configuration can adjust the positions of the outer plates 2 and 3 and the inner plate 4 to each other in the longitudinal direction, and is provided with connecting bolts 9 in desired bolt insertion holes 5 and positioning holes 7. By penetrating, the outer plates 2 and 3 and the inner plate 4 are connected to each other, and the vernier fitting 1 having a desired longitudinal length can be obtained. Here, since the bolt insertion holes 5 and the positioning holes 7 are formed at different pitches as described above, the combination of the bolt insertion holes 5 and the positioning holes 7 for penetrating the connecting bolts 9 is changed to change the vernier. The length in the longitudinal direction of the metal fitting 1 can be changed stepwise.

  This vernier fitting 1 is used as a component part of a tension insulator that grips an overhead power transmission line on a support such as a steel tower, and has a tension clamp that grips the overhead power transmission line and a insulator attached to the support. It is interposed in between, and is used to adjust the slackness (degree of slackness) of the overhead power transmission line by adjusting its longitudinal length.

  FIG. 2 is a top view showing an attached state of the vernier fitting 1. In the vernier fitting 1, the base ends of the outer plates 2, 3 are connected to both ends of the double yoke 10 by right angle clevis links 11, respectively, and the base end of the inner plate 4 is a right angle clevis link 12, parallel clevis 13, A special clevis link 14 is connected to the proximal end of the tension clamp 15. The tension clamp 15 holds a power transmission line (not shown) at the tip side. Similarly to the above, the vernier fitting 1, the tension clamp 15 and the like are also connected to both ends of another double yoke 16 disposed below the double yoke 10, respectively. Accordingly, four power transmission lines are held, and FIG. 2 shows a configuration example of a tension conductor for four conductors.

  The double yokes 10 and 16 are respectively connected to the upper end and the lower end of a double yoke 17 extending in the vertical direction, and the double yoke 17 is connected to an insulator (not shown) by a connecting metal fitting. The insulator is attached to a support such as a steel tower.

  FIGS. 3A and 3B are side views for explaining a method of adjusting the length of the vernier fitting 1, wherein FIG. 3A shows a case where the vernier fitting 1 has a standard length, and FIG. 3B shows a case where the length is a minimum length. (C) shows the case of the maximum length. The length of the vernier fitting 1 is adjusted by attaching the adjustment tool 20. The adjustment tool 20 includes a main body 22 to which a double-acting cylinder 21 is attached and an engaging portion 24 attached to the tip of a piston rod 23 of the double-acting cylinder 21 and is attached to the vernier fitting 1 from above. Is done. 4A is a front view of the main body 22 viewed from the tension clamp 15 side, and FIG. 4B is a front view of the engaging portion 24 viewed from the tension clamp 15 side.

  The main body 22 has a pair of mounting plates 25 and 25 formed on a bottom surface 22a serving as a mounting surface. The mounting plate 25 has a bolt insertion hole 26 in the vicinity of its tip, and an engagement surface 27 that engages with the engagement protrusions 2a and 3a on the end surface on the engagement portion 24 side. The main body 22 is mounted such that the bottom surface 22a is in contact with the top surfaces of the outer plates 2 and 3, and the engagement surfaces 27 and 27 of the pair of attachment plates 25 and 25 are engaged with the engagement protrusions 2a and 3a, respectively. Combined. Then, a nut 29 is screwed into a bolt 28 inserted into the bolt insertion holes 26, 26, and the outer plates 2, 3 are sandwiched between the pair of attachment plates 25, 25.

  Moreover, the engaging part 24 has a pair of attachment plates 30 and 30 formed in the bottom face 24a used as a mounting surface. The mounting plate 30 has a bolt insertion hole 31 at the center thereof. The engaging portion 24 is mounted so that the bottom surface 24a is in contact with the top surface of the inner plate 4, and the bolt insertion hole 31 is made to coincide with any of the engaging holes 8a, 8b, and 8c. Then, the bolt 32 is inserted into the bolt insertion holes 31 and 31 and the engagement hole 8, the nut 33 is screwed, and the pair of attachment plates 30 and 30 are attached to the inner plate 4.

  After attaching the adjustment tool 20 to the vernier fitting 1 in this way, the connecting bolt 9 is removed. At this time, if the piston rod 23 is slightly retracted, the tension acting on the connecting bolt 9 can be reduced, and the connecting bolt 9 can be easily removed. In a state where the connecting bolt 9 is removed, the tension is acting on the outer plates 2, 3 and the inner plate 4 in opposite directions, and the outer plates 2, 3 and the inner plate 4 are connected by the adjusting tool 20. It will be. Therefore, the outer plates 2 and 3 and the inner plate 4 are held substantially in a straight line on the line of tension. In this state, the piston rod 23 is moved forward or backward to adjust the positions of the outer plates 2 and 3 and the inner plate 4 to adjust the length of the vernier fitting 1. The double acting cylinder 21 is operated manually.

  For example, when the vernier fitting 1 has a standard length as shown in FIG. 3A, the engagement portion 24 is inserted into the engagement hole 8a on the proximal end side of the inner plate 4 when the length is shortened. By engaging and retracting the piston rod 23, it can be adjusted between the standard length and the minimum length. Further, when the length is increased, the engagement portion 24 is engaged with the engagement hole 8c on the distal end side of the inner plate 4 and the piston rod 23 is advanced, so that the length is between the standard length and the maximum length. Can be adjusted. When the length to be adjusted is short, the amount of movement of the piston rod 23 can be reduced and the working time can be shortened by engaging the engaging portion 24 with the intermediate engaging hole 8b.

  The length of the vernier fitting 1 is adjusted by changing the combination of the bolt insertion holes 5 of the outer plates 2, 3 and the positioning holes 7 of the inner plate 4. For example, when the bolt insertion holes 5 of the outer plates 2 and 3 are formed with a pitch of 30 mm and the positioning holes 7 of the inner plate 4 are formed with a pitch of 40 mm, the length of the vernier fitting 1 can be adjusted in units of 10 mm. .

  After adjusting the positions of the outer plates 2, 3 and the inner plate 4 so as to have a desired length in this way, the connecting bolt 9 is inserted into the bolt insertion hole 5 and the positioning hole 7, and the outer plates 2, 3 are inserted. And the inner plate 4 are connected, the adjustment tool 20 is removed, and the adjustment work is completed.

  As described above, according to the present embodiment, since the number of parts constituting the adjustment tool 20 is reduced, the adjustment tool 20 is compact and lightweight, and handling is facilitated, and adjustment work at a high place is also facilitated. Moreover, since the adjustment tool 20 can be attached from the upper side of the vernier fitting 1, only one worker can perform attachment work and adjustment work, and work efficiency can be improved. For example, in the case of four conductors, it is necessary to attach the conventional adjustment tool 60 from the horizontal direction in consideration of the height of the lower vernier fitting, and thus two workers are required. Since the adjustment tool 20 can be attached from above without considering the height, only one worker is required, and the work cost can be reduced.

  Further, since the adjusting tool 20 is attached to the vernier fitting 1, a standard linking fitting can be used instead of the special linking fittings 45 and 48 connected to both ends of the conventional vernier fitting 40. This can reduce the part cost. Further, since the standard connection fitting is shorter than the special connection fitting, the tension clamp 15 can be installed closer to the support. As a result, the jumper line connecting between the transmission line installed by another tension insulator attached to the support is shortened, and the cost can be reduced.

  Furthermore, at the time of adjusting the slackness, the adjustment tool 20 and the vernier fitting 1 are integrally expanded and contracted by a required length, so that workability is improved without taking time.

  As described above, by forming the engagement protrusions 2a and 3a on the side surfaces of the outer plates 2 and 3, the main body 22 of the adjustment tool 20 can be engaged at a position closer to the inner plate 4, and the adjustment tool 20 Miniaturization can be achieved. In the case of the engagement hole, it is necessary to form it at a position not affected by the inner plate 4, that is, at the base end side of the outer plates 2 and 3, so that the distance from the engaging portion of the inner plate 4 becomes longer. This is because the length of the adjustment tool 20 is increased. In addition, since there are three members of the pair of outer plates 2 and 3 and the inner plate 4 between the engaging protrusions 2a and 3a, the heavy body 22 is attached to the upper surface of these three members. Since it can also be supported, the adjustment tool 20 can be supported stably. On the other hand, since it is necessary for the inner plate 4 to support the adjustment tool 20 alone, the engagement hole 8 is formed, and the engagement portion 24 of the adjustment tool 20 is engaged with the bolt 32, so that the inner plate 4 can be stabilized. The adjustment tool 20 can be supported.

  Therefore, as in this embodiment, the main body 22 is engaged with the engagement protrusions 2 a and 3 a formed on the outer plates 2 and 3, and the engagement portion 24 is connected to the engagement hole 8 formed on the inner plate 4 with the bolt 32. A mode in which the adjusting tool 20 is mounted on the vernier fitting 1 by engaging is optimal.

  In addition, if the engagement hole is formed in each base end part side of the outer side plates 2 and 3 and the inner side plate 4, the conventional adjustment tool 60 can also be used. However, in order to eliminate various drawbacks as described above, it is preferable to use the adjusting tool 20 having the above structure.

The structure of the vernier metal fitting which is one embodiment of this invention is shown, (a) is a top view, (b) is a side view. It is a top view which shows the attachment state of a vernier metal fitting. It is a side view for demonstrating the length adjustment method of a vernier metal fitting. It is a front view which shows the attachment state of an adjustment tool, (a) shows a main body, (b) shows an engaging part. It is a top view which shows the attachment state of the conventional vernier metal fitting. It is a side view which shows the length adjustment method of the conventional vernier metal fitting. It is a side view which shows the length adjustment method of the conventional vernier metal fitting.

Explanation of symbols

      1 .... Vernier metal fittings, 2 .... Outer plate, 2a ... Engagement projection, 3 .... Outer plate, 3a ... Engagement projection, 4 .... Inner plate, 8 .... Engagement hole, 15 .... Tension Clamp, 20 ... Adjusting tool

Claims (2)

  A vernier fitting (1) interposed between a tension clamp (15) holding an aerial transmission line and an insulator attached to a support such as a steel tower, and a pair of outer plates (2) (3 ) With an inner plate (4) interposed between them, and the positions of the inner plate (4) and the inner plate (4) can be adjusted with respect to each other in the longitudinal direction. Can be connected to each other, and on the side surfaces of the outer plates (2) and (3), engaging projections (2a) and (3a) are engaged with the adjusting tool (20) used for the position adjustment. ), And the inner plate (4) is provided with a plurality of engagement holes (8) with which the adjustment tool (20) is engaged, and the engagement protrusions of the outer plates (2) and (3). (2a) (3a) is formed at the tip on the inner plate 4 side. Vernier bracket, characterized in that.   In order to adjust the position, a plurality of bolt insertion holes (5) are formed in the outer plates (2) and (3), and a plurality of positioning holes (7) are formed in the inner plate (4). These bolt insertion holes (5) and positioning holes (7) are located at the base ends of the outer plates (2) (3) rather than the engaging projections (2a) (3a) of the outer plates (2) (3). 2. The vernier fitting according to claim 1, wherein the vernier fitting is formed sideways.