JP3788551B2 - Overhead power line connection bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an overhead power transmission line fitting used for connecting components in an overhead power transmission line support structure.
[0002]
[Prior art]
There are various types of overhead transmission line support structures such as tension devices, suspension devices, jumper devices, and interphase spacers. In these overhead transmission line support structures, the components are connected to each other by appropriate connecting brackets. Yes.
6 and 7 show the configuration of a conventional general suspension device.
As shown in the figure, the suspension device 1 is provided with a suspension device mounting bracket 2 for mounting the device on a steel tower, a suspension clamp 3 for suspensionly supporting a transmission line, and an insulation between the suspension device mounting bracket 2 and the suspension clamp 3. The components such as the hanging insulator 4 are connected to each other by a plurality of connecting metal fittings.
[0003]
For example, the suspension device mounting bracket 2 and the suspension insulator 4 are connected to each other through three connection brackets of a plate-shaped U clevis 6, a horn mounting bracket 7, and a ball clevis 8. Further, the suspension insulator 4 and the suspension clamp 3 are connected to each other through three connection fittings of a parallel socket clevis 9, a double yoke 10, and a right angle clevis link 11.
[0004]
The above-mentioned various connecting brackets are movable joint structures in which both ends are connected to other parts or connecting brackets, and each connecting portion allows a change in posture due to rotation of a connecting partner. Is formed.
A predetermined compressive load or tensile load is usually applied to the connecting portion of such a movable joint structure depending on the weight of the transmission line and the weight of the components of the suspension device 1, and the metal in the connecting portion is caused by these loads. There is no special problem if the contact pressure between the contact surfaces is kept above a certain level.
However, if the load acting on the connecting part fluctuates due to vibration of the power transmission line due to wind and the contact pressure between the metal contact surfaces in the connecting part decreases below a predetermined level, an electrical contact failure occurs and the metal in the connecting part Discharge due to poor electrical contact occurs between the contact surfaces.
In this case, the discharge becomes pulse noise, which may cause troubles in receiving television or radio.
[0005]
Conventionally, as a measure to prevent the generation of such pulse noise, even if the metal parts that are in contact with each other at the connecting part are electrically connected with a bond wire, the load acting on the connecting part due to the influence of wind or the like is reduced. The technology that prevents electrical contact failure between the metal contact surfaces in the connection part, or the contact pressure between the metal contact surfaces in the connection part is always constant even if the load acting on the connection part is reduced due to the influence of wind, etc. A technique of attaching a dedicated weight to the suspension device 1 or the like so as to be sufficiently maintained is provided.
[0006]
[Problems to be solved by the invention]
However, the transmission lines are always exposed to wind vibrations, and in the case of countermeasures against pulse noise using bond lines, the bond lines are prone to fatigue fracture early due to vibrations transmitted from the transmission lines. There was a problem that was frequently requested.
In addition, in the case of pulse noise countermeasures equipped with a special weight to maintain the contact pressure, a weight of at least several hundred kg is required as the equipped weight, and heavy objects are installed at high places. Therefore, there was a problem that construction was difficult and a great deal of labor was required. In addition, the design load of all the parts that constitute the suspension device 1 and the like must be increased so that the load of the weight can be endured, and the construction cost increases due to the improvement of the part design load and the production of the weight itself. The problem of doing was also raised.
[0007]
The present invention has been proposed under the above circumstances, and is easy to construct and inexpensive, can prevent the generation of pulse noise at the connecting portion of the overhead power transmission line support structure, and has good effectiveness. The purpose is to provide a connecting bracket for overhead power transmission lines that can be maintained over a long period of time and can reduce the number of maintenance and inspection operations for measures against pulse noise.
[0008]
[Means for Solving the Problems]
The present invention for solving the above-mentioned problems is an overhead power transmission line fitting used for connecting parts in an overhead power transmission line support structure,
Metal fittings formed in a movable joint structure with pin coupling that allows both ends to be connected to the counterpart part and allows variation in the posture of the counterpart part to which at least one of these connection parts is connected A main body and a component connected to the connecting portion of the movable joint structure in order to prevent variation in contact pressure between the metal contact surface of the pin outer peripheral surface and the pin hole inner surface in the connecting portion of the movable joint structure by the pin connection ; And a spring member for applying a compressive load or a tensile load in a direction perpendicular to the pin .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an overhead power transmission line fitting according to the present invention will be described below with reference to the examples shown in FIGS.
FIG. 1 is a side view of an essential part of a suspension device 15 showing a first embodiment of a connecting bracket for an overhead power transmission line according to the present invention.
In this suspension device 15, a suspension clamp 18 that suspends and supports a power transmission line 16 and an insulator 19 are connected by the overhead power transmission line coupling fitting 21 of the first embodiment of the present invention.
[0010]
The connecting bracket 21 is composed of a bracket body 23 and a spring member 24.
The metal fitting body 23 has a structure called a so-called right-angle clevis link, and one end of the metal fitting 23 is attached to a hanging ear portion 27a on the flange member 27 fixed to the flange 19a of the end portion of the insulator 19 by a bolt 25 and a nut 26. The first connecting portion 23a is rotatably pin-coupled, and the other end is a second connecting portion 23b that is rotatably pin-coupled to the connecting portion 18a mounted on the suspension clamp 18. .
[0011]
In the first connection portion 23a, the insertion direction of the connection pin 29 is the line direction, whereas in the second connection portion 23b, the insertion direction of the connection pin 30 is a direction orthogonal to the line direction. Thus, since the first connecting portion 23a and the second connecting portion 23b have a structure in which the insertion direction of the connecting pin is orthogonal, the insulator 19 and the power transmission line 16 are either in the line direction or in the direction orthogonal to the line. Also, relative swinging is possible.
[0012]
The spring member 24 is a compression coil spring having one end abutting against a flange member 27 fixed to the insulator 19 and the other end abutting against the end face of the suspension clamp 18. A tensile load of several hundred kg is applied between the first and second connecting parts 23a and 23b, which have a movable joint structure by pin connection, to stabilize the contact pressure between the metal contact surfaces. .
[0013]
In the above-mentioned connecting fitting 21, the load acting on the first and second connecting portions 23a and 23b of the movable joint structure due to the weight of the power transmission line 16 and the suspension clamp 18 varies due to the influence of the vibration of the power transmission line 16 caused by wind. To do.
However, between the metal contact surfaces of the first and second connecting portions 23a and 23b, the fluctuation of the contact pressure is suppressed by the load by the spring member 24, so that a stable contact pressure can be obtained at all times. Since the mechanical contact state can be maintained, generation of pulse noise due to poor electrical contact between the metal contact surfaces in the first and second connecting portions 23a and 23b is prevented.
[0014]
In addition, the spring member 24 for maintaining the contact pressure between the metal contact surfaces in the first and second connecting portions 23a and 23b is compared with the conventional measure equipped with a dedicated weight for applying a load to the connecting portion. It can be made much lighter and more compact, and construction work that is a work at a high place can be facilitated.
Further, a part to which a load is applied by the spring member 24 needs to improve the design load by the load of the spring member 24, but the part that needs to be improved is a part interposed between the flange member 27 and the suspension clamp 18. That is, only the hanging ear portion 27a of the flange member 27, the metal fitting body 23, the connecting portion 18a of the suspension clamp 18, and the connecting pins 29 and 30 are compared with the conventional measures equipped with a dedicated weight for applying a load to the connecting portion. Therefore, the number of parts for changing the design load can be reduced, and the construction cost and the economic burden due to the part design change can be reduced.
[0015]
Therefore, it is possible to prevent the generation of pulse noise at the connecting portion of the suspension device 15 at a low cost with easy construction.
In addition, the spring member 24 has higher durability against vibration and the like than the conventional measures using bond wires, and absorbs vibrations acting on the connecting portions 23a and 23b, thereby connecting these connecting portions 23a and 23b. In addition, it is possible to prevent wear and the like due to vibration of the connecting pins 29 and 30, and therefore, it is possible to maintain a good effect of properly maintaining the contact pressure between the metal contact surfaces in the connecting portions 23a and 23b over a long period of time. Therefore, it is possible to reduce the number of maintenance and inspection work for measures against pulse noise.
[0016]
FIG. 2 is a side view of an essential part of the lever device 32 showing a second embodiment of the overhead power transmission line coupling bracket of the present invention.
This lever device 32 is composed of a plurality of levers 33 and uses the connecting bracket 35 according to the present invention for connecting the levers 33 to each other.
The connecting bracket 35 is also composed of a bracket body 36 and a spring member 37.
However, the metal fitting body 36 functions as a connecting rod of the insulator 33, and one end side is embedded and fixed in a porcelain portion 33a which is an electrically insulating portion of one insulator 33, and the other end side is the other insulator 33. The cap 33b is rotatably connected via a connecting pin 33c.
Further, the spring member 37 is a compression coil spring as in the first embodiment, and is interposed between the levers 33 to be connected to each other so as to apply an appropriate tensile load between the levers 33, so that the cap 33b of the metal fitting body 36 is provided. The fluctuation of the contact pressure between the metal contact surfaces in the connecting portion is suppressed.
[0017]
FIG. 3 is a side view of a tension device 39 showing a third embodiment of the overhead power transmission line fitting of the present invention.
The tension device 39 uses a connecting bracket 42 according to the present invention for connecting a tension clamp 40 and an insulator 41, which are its component parts.
The connecting fitting 42 is mounted in a compressed state between a fitting main body 43 having both ends of a connecting portion 43 a having a pin joint structure, and a tension clamp 40 and an insulator 41 connected by the fitting main body 43. This is a structure having a spring member 44 that suppresses fluctuations in the contact pressure between the metal contact surfaces in 43a.
[0018]
FIG. 4 is a side view of a suspension device 46 showing a fourth embodiment of the overhead power transmission line fitting of the present invention.
The suspension device 46 uses the connection fitting 50 according to the present invention for connection between a suspension clamp 47 which is a component of the suspension device 46 and a yoke 49 which is pin-coupled to a lowermost insulator 48.
The connecting metal fitting 50 is mounted in a compressed state between a metal fitting body 51 whose both ends are a connecting part 51a having a pin joint structure, and a suspension clamp 47 connected by the metal fitting body 51 and a yoke 49. This is a structure having a spring member 53 that suppresses fluctuations in contact pressure between metal contact surfaces in 51a.
[0019]
FIG. 5 is a side view of a suspension device 55 showing a fifth embodiment of the overhead power transmission line fitting according to the present invention.
This suspension device 55 uses a connection fitting 59 according to the present invention for connection between a suspension clamp 56 that suspends and supports a power transmission line 16 and a flange member 27 that is fastened to a lowermost insulator 57 by bolts.
In this connection fitting 59, the first connection portion 61a on one end side is pin-coupled to the suspension ear portion 27a of the flange member 27, and the second connection portion 61b on the other end side is connected to the connection portion 56a of the suspension clamp 56. A metal member 61 to be pin-coupled, and a spring member 63 which is mounted between the flange member 27 and the suspension clamp 56 in a compressed state and suppresses fluctuations in contact pressure between the metal contact surfaces in each of the connecting portions 61a and 61b. It consists of and.
[0020]
The metal fitting body 61 is an orthogonal clevis link in which the insertion direction of the connection pin in the first connection portion 61a and the insertion direction of the connection pin in the second connection portion 61b are orthogonal to each other. This is common to the metal fitting body 23 of the connecting metal fitting 21 in FIG.
However, the spring member 63 is not a coil spring but a plate spring, which is different from the previous embodiment.
[0021]
The parts to be connected by the connecting metal fittings of the present invention are not limited to those shown in each of the above embodiments, but may be used to connect components used in jumper devices, interphase spacers and other various overhead power transmission line support structures. Can do.
[0022]
Further, in each of the above-described embodiments, the compression spring is used as the spring member used for the connection fitting, but it is also conceivable to use a tension spring. For example, in FIG. 1, when the lever 19 and the suspension clamp 18 are pressed from the outside (up and down in FIG. 1) and a compressive load is applied to the portion of the connecting bracket 21, a tension is applied instead of the compression coil spring. A coil spring is used. By this tension coil spring, a compressive load is further applied to the portion of the connecting fitting 21 to which the compressive force is originally applied, and the fluctuation of the contact pressure between the metal contact surfaces in each connecting portion is suppressed.
[0023]
【The invention's effect】
According to the overhead power transmission line coupling bracket of the present invention, the load acting on the connecting portion of the movable joint structure by pin coupling due to the weight of the power transmission line or the weight of the components of the overhead power transmission line support structure is caused by the vibration of the power transmission line caused by wind. It fluctuates by the influence of etc.
However, between the metal contact surfaces of the pin outer peripheral surface and the pin hole inner surface in the connecting part of the movable joint structure by the pin connection, the fluctuation of the contact pressure is suppressed by the load by the spring member, so that a stable contact pressure is always obtained. Therefore, a stable electrical contact state can be maintained, and generation of pulse noise caused by poor electrical contact between the metal contact surfaces in the connecting portion of the movable joint structure can be prevented.
In addition, the spring member for maintaining the contact pressure between the metal contact surfaces in the connecting part of the movable joint structure is much lighter and more compact compared to the conventional measures equipped with a dedicated weight that applies a load to the connecting part. The construction work which is a high place work can be made easy. In addition, a part to which the load of the spring member acts needs to improve the design load by the amount of the spring member, but the part to which the load of the spring member acts is one of the parts constituting the overhead transmission line support structure. Compared with conventional measures that are equipped with dedicated weights that apply a load to the connecting part, the number of parts to change the design load can be reduced, and the economic burden due to construction costs and part design changes can be reduced. Can do.
Therefore, it is possible to prevent the generation of pulse noise at the connecting portion of the overhead power transmission line support structure easily and inexpensively.
In addition, the spring member has higher durability against vibrations compared to conventional measures using bond wires, and it also absorbs vibrations acting on the connecting part to prevent wear due to vibration of the connecting part. As a result, it is possible to maintain the good effect of maintaining the contact pressure between the metal contact surfaces properly at the connecting portion over a long period of time, and to reduce the number of maintenance and inspection operations for measures against pulse noise.
[Brief description of the drawings]
FIG. 1 is a side view of a suspension device showing a first embodiment of a connecting bracket for an overhead power transmission line according to the present invention.
FIG. 2 is a side view of a lever device showing a second embodiment of the overhead power transmission line fitting according to the present invention.
FIG. 3 is a side view of a tension device showing a third embodiment of the overhead power transmission line fitting according to the present invention.
FIG. 4 is a side view of a suspension device showing a fourth embodiment of the overhead power transmission line fitting according to the present invention.
FIG. 5 is a side view of a suspension device showing a fifth embodiment of the overhead power transmission line fitting according to the present invention.
FIG. 6 is a side view of a conventional suspension system for an overhead power transmission line.
7 is a view taken in the direction of arrow A in FIG.
[Explanation of symbols]
15, 46, 55 Suspension device 16 Transmission line 18, 47, 56 Suspension clamp 19, 33, 41, 57 Insulator 21 Connecting bracket 23, 61 Bracket body (right angle clevis link)
23a, 23b Connecting portion 24, 37, 44, 53 Spring member 27 Flange member 32 Insulator device 35 Connecting bracket (connecting rod)
39 Tensile device 40 Drain clamps 42, 50, 59 Connecting metal fittings 43, 51 Metal fitting bodies 43a, 51a, 61a Connecting parts 49 Yoke 63 Spring members

Claims (1)

An overhead power transmission line fitting used for connecting parts in an overhead power line support structure,
Metal fittings formed in a movable joint structure with pin coupling that allows both ends to be connected to the counterpart part and at least one of these connection parts to allow variation in the posture of the counterpart part connected A main body and a component connected to the connecting portion of the movable joint structure in order to prevent fluctuations in contact pressure between the metal outer peripheral surface of the pin outer peripheral surface and the inner surface of the pin hole in the connecting portion of the movable joint structure by the pin connection ; And a spring member for applying a compressive load or a tensile load in a direction orthogonal to the pin between the two.

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