JP2019037110A - Bearing contact type shoe chain cable extending vehicle - Google Patents

Abstract

To provide a shoe chain cable extending vehicle capable of reducing friction by using a rotor such as a small roller with a built-in low-rotation friction component such as a bearing or a sliding bearing so that an excessive force is not applied to a cam follower on the high-tension side during winding work.SOLUTION: The shoe chain cable extending vehicle is structured so that a contact face between a bottom face of a shoe 20 for the shoe chain cable extending vehicle and a shoe chain drum 11 becomes a rotor contact surface by a small roller 21 with built-in bearings, in order to reduce reaction force applied on a cam follower.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric wire erection work for an overhead power transmission line and a wire drawing vehicle used for electric wire removal work.

Conventional shoe chain wire-drawing vehicles have been developed, improved, and used with a focus on how to apply brakes in order to send out electric wires, that is, to ensure wire drawing.
In recent years, from the viewpoint of ease of wire drawing work and efficient use of machinery, wire-drawing vehicles that can also be wound are widely used.

  A shoe chain wire-carrying wheel winds around a shoe chain drum in a state where a shoe chain to which a number of shoes are connected receives and supports an electric wire. It is structured to send out.

The load that the shoe chain extension wheel receives from the electric wire is received through the shoe by the surface of the shoe chain drum and a linear member called a key arranged on the shoe chain drum surface in parallel with the shoe chain drum shaft. Yes.
That is, the surface of the shoe chain drum mainly receives a load in the normal direction of the shoe chain drum, and the key mainly receives a load in the tangential direction of the shoe chain drum.
In addition, the shoe chain cable has a reaction force against the load from the electric wire by connecting the shoe chain cable body and the branch line foundation installed behind the shoe chain cable with a wire.

  After the shoe is wound around the shoe chain drum as a shoe chain, it rotates according to the rotation of the shoe chain drum, but gradually moves sideways along the key while rotating. Give rise to space.

  This lateral movement is laterally moved by a predetermined width by a component that generates a reaction force for lateral movement, that is, a cam follower, while receiving resistance due to friction between the shoe and the surface of the shoe chain drum and friction between the shoe and the key. . The resistance caused by the friction between the shoe and the shoe chain drum is proportional to the tension of the electric wire. I was letting.

  In addition, the surface of the shoe chain drum is close to a perfect circle with respect to the shoe chain drum shaft, and the surface is precisely finished and coated with lubricating oil so as to reduce friction when the bottom surface of the shoe moves in contact. Troubles such as surface roughness due to sand biting and uneven wear on the bottom of the shoe occurred.

  The present invention provides friction reduction by employing a rotating body such as a small roller incorporating a low-rotation friction component such as a bearing or a sliding bearing.

  Until now, the contact between the shoe and the shoe chain drum has been generally a contact between metal planes. In the present invention, the contact between the shoe and the shoe chain drum is reduced by making the contact with a rotating body.

  The rotating body may be equipped with a small roller or the like that incorporates a low rotational friction part such as a bearing at the contact portion of either the shoe or the shoe chain drum, or between the shoe and the shoe chain drum. May be equipped with a roller chain.

  When the frictional force between the shoe and the shoe chain drum decreases, the reaction force due to the cam follower also becomes extremely small. With a simple guide plate, the lateral movement of the shoe chain can be controlled. For this reason, a cam follower becomes simple and lightweight.

  Furthermore, by making the linear part of the portion in contact with the shoe into a rotatable cylindrical part arranged in a bowl shape, the surface of the shoe chain drum is brought close to a perfect circle, and the roughness of the surface of the shoe chain drum is reduced. An elaborate finishing process is not required, and the processing of the bottom surface of the shoe is changed from a phase finishing adapted to the surface of the shoe chain drum to a planar finishing adapted to a linear part, thereby making the manufacturing process more efficient.

FIG. 1 shows, as an embodiment of the present invention, a state in which a small roller with a built-in bearing is provided at a contact portion between a shoe and a shoe chain drum as shown in claim 1. FIG. 2 shows, as an embodiment of the present invention, a schematic diagram of a rotatable part constituted by a linear shoe receiving member integrated with a key instead of a shoe chain drum as described in claim 2. FIG. 3 shows an outline of the extension line when installing the electric wire of the overhead power transmission line. The front side, that is, the power transmission line side is the high tension side, and the rear side, that is, the electric wire drum side is the low tension side. FIG. 4 schematically shows the relationship between the shoe chain, the shoe chain drum, and the electric wires, which are the main parts of the shoe chain cable. FIG. 5 is a schematic front view of a shoe chain drum of a shoe chain extension line car, and describes the positional relationship between the shoe chain and the cam follower, the lateral movement of the shoe, and the like. FIG. 6 enlarges the shoe in the shoe chain, shows the relationship between the shoe and the electric wire, and the relationship between the shoe, the shoe chain drum and the key, and also explains the contact location.

There are three contact portions between the shoe 20 and the shoe chain drum 11 as shown in FIG. It is a portion in contact with the surface of the shoe chain drum 11 that supports the bottom surface of the shoe 20, and there is one each before and after the key 13. The other part is in contact with the key 13 that transmits the rotational force of the shoe chain drum 11 to the shoe 20.
The present invention provides a structure in which all of these contact portions are contacted by a rotating body.

A small roller 21 with a built-in bearing as a rotating body may be provided on the shoe 20 or on the shoe chain drum 11 and the key 13.
FIG. 1 shows a schematic diagram in which the shoe chain drum 11 and the key 13 are equipped with a small roller 21 with a built-in bearing as a rotating body.

  The small roller 21 with a built-in bearing as the rotating body may be provided only on the key 13 or only on the shoe 20 in contact with the key 13.

  Further, not the entire contact portion but only the contact portion with the key 13, for example, is brought into contact with the small roller 21 with a built-in bearing as a rotating body, or the surface of the shoe chain drum 11 is left as it is, or conversely the shoe chain drum It is also conceivable that only the contact portion with the surface of 11 is contacted with the small roller 21 with a built-in bearing as a rotating body, and the contact portion with the key 13 is left as it is, and the frictional force is considerably reduced.

  When a roller chain is used instead of the small roller 21 with a built-in bearing as a rotating body, is it used only for the key 13, only the shoe chain drum 11, or both the key 13 and the shoe chain drum 11? May be selected according to the magnitude of the frictional force.

  Further, as shown in claim 2, without using the shoe chain drum 11, the linear shoe receiving part 22 constituting only the portion in contact with the shoe 20 as shown in FIG. There is also provided a method of forming a bowl-like structure arranged in parallel with the rotation shaft 12a on the circumference of a concentric circle.

DESCRIPTION OF SYMBOLS 1 Electric wire 2 Steel tower 3 Wire drawing car 4 Electric wire drum 10 Shoe chain 11 Shoe chain drum 12 Shoe chain drum shaft 12a Shoe receiving part rotating shaft 13 Key 14 Cam follower 20 Shoe 21 Small roller 22 with a built-in bearing 22 Shoe receiving part 30

Claims (2)

  A shoe that receives and supports an electric wire or wire, and a cylindrical surface that feeds or winds the electric wire or wire while supporting the shoe and resisting the tension of the electric wire or wire. A shoe chain wire-drawing wheel characterized in that a contact part with a rotatable part having a key is brought into contact with a rotating body incorporating a rotary bearing with little friction.   A rotatable part having a linear key on a cylindrical surface for feeding or winding the electric wire or wire while resisting the tension of the electric wire or wire while receiving and supporting the shoe, A shoe chain extension characterized by a linear shoe receiving part that constitutes only a portion that comes into contact with the hook, and a linear shoe receiving part having a hook shape arranged in parallel with the rotation axis on a predetermined circumference car.

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