JPH0419764B2 - - Google Patents

Description

[Detailed description of the invention] <Field of application of the invention> The present invention relates to a metal wheel for overhead wires.

In the following description, the term "electric wire" is used to include wires used in overhead line work, messenger wires, traction wires, and the like.

<Conventional technology> Conventional metal wheels for overhead lines include, for example, the "Explanation of Construction Standards for Overhead Line Construction" (published by the Transmission Line Construction Technology Study Group).
Various methods are known, as shown on page 96 onwards.

<Problems to be Solved by the Invention> However, all of these devices only have wheels that rotate in synchronization with the passage of electric wires, so to speak, they only have the function of simply supporting the electric wires. Therefore, especially when passing the protector, the movement of the wire is temporarily stopped until the protector is placed in the metal wheel, so temporarily there is a very large extension of the wire from the metal wheel to the engine field side. Tension is created;
As a result, an unnecessary burden was placed on the electric wires.

In addition, considering the purpose of wire tension control, it is best to perform "partial wire tension control" in which the wire tension is set according to the situation for each steel tower section if possible. This is desirable in terms of reducing the burden of the wire drawing tension as much as possible. Furthermore, in some cases, it may be desired to perform similar "partial wire tension control" that temporarily increases the wire tension in a specific steel tower section. However, there has been no means to achieve this in the past, and the development of such a method has been desired.

In view of such conventional circumstances, in this invention,
It is an object of the present invention to provide a metal wheel for overhead wires that can brake or drive electric wires.

<Means for Solving the Problems> As a means for achieving the above object, the overhead line metal wheel according to the present invention includes one or more pairs of elastic rollers whose interiors are filled with compressed gas, and the elastic rollers. The gist of the present invention is to include a control mechanism that can freely brake or drive the pair of rollers, and a wire guide means that can freely hold the wire between the pair of elastic rollers.

<Operation> In other words, since the electric wire is clamped and braked or driven by the elastic rollers filled with compressed gas, if the elastic rollers are driven when passing through the protector, the electric wire will not be different from the protector. Even if the wire is not flexible due to its diameter, it can be easily passed through by being forced to feed the wire by pinching it while being adapted to it by the elasticity of the elastic roller.In addition, the clamping force of the elastic roller in a braking state can be used to easily pass the wire. By braking or driving the wire, it is possible to perform "partial wire drawing tension control."

<Example> Hereinafter, an example of the metal wheel for overhead wires according to the present invention will be described with reference to FIGS. 1 and 2.

In addition to wheels 2 similar to conventional ones, this overhead line metal wheel 1 has an airtight outer shell made of an elastic material with a large coefficient of friction, specifically a rubber material, and has a compressed gas inside, includes a pair of elastic rollers 3 filled with air, and the operating state of the elastic rollers 3, that is, whether a braking force is applied to the electric wire 4, a feeding force (driving force) is applied to the electric wire 4, or whether it is allowed to rotate freely. Control mechanism 5 for controlling to any operating state
A wire guide means 7 is provided which allows the wire 4 to be held between a pair of elastic rollers. and,
The elastic roller 3 has an elongated shape so that it can cope with changes in the entrance angle of the electric wire 4. Preferably, a hydraulic type is used as the control mechanism 5,
The details are well known and will not be described here. 8 in the figure is the elastic roller 3
A speed increaser interposed between the control mechanism 5 and the control mechanism 5 increases the speed of the rotation of the elastic roller 3 in response to the movement of the electric wire 4, and transmits the increased speed to a hydraulic actuator (not shown) within the control mechanism 5.

Therefore, if the elastic roller 3 is driven when passing through the protector 9, even if the portion has a different diameter and does not have flexibility control, like the protector 9, the elastic roller 3 will force it to fit in and clamp it with its elasticity. It means that it can pass through easily, and also,
By braking or feeding out the electric wire 4 using the clamping force of the elastic rollers 3 in a braking or driving state, "partial wire drawing tension control" is also possible. Such various control states can be controlled, for example, by the overhead line metal wheel 1.
A wire tension meter is also provided in the steel tower where the wire tension meter is installed, and the selection is made based on information from the wire tension meter, but the explanation regarding this point is omitted as it has no direct relation to this invention.

In this embodiment, only one pair of elastic rollers 3 is provided, but it goes without saying that two or more pairs may be provided. Moreover, although the wheel 2 is of one wheel type, it is of course possible to use a multi-wheel type. Furthermore, it goes without saying that the elastic material with a large coefficient of friction is not limited to rubber, and the compressed gas filled inside is not limited to air.

<Effects of the Invention> As explained above, the overhead line metal wheel according to the present invention is capable of braking or driving a pair of elastic rollers whose interior is filled with compressed gas, and can freely clamp electric wires by the pair of elastic rollers. Therefore, if the elastic rollers are driven when passing through the protector, the protector can be easily passed, and if the elastic rollers are braked or driven, "partial tension control" can be performed. It has the excellent effect of making it possible to perform the following.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a metal wheel for overhead wires according to the present invention, and FIG. 2 is a schematic side view viewed from the direction of the arrow in FIG. 1... Catenary wire wheel, 3... Elastic roller, 5...
Control mechanism, 7...Wire guide means.

Claims (1)

[Claims] 1. An electric wire guide having one or more pairs of elastic rollers filled with compressed gas and a control mechanism that can freely brake or drive the pair of elastic rollers, so that the electric wire can be freely clamped by the pair of elastic rollers. Overhead wire car with means.