JP3209060B2 - Rolling wire car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for extending a power transmission line,
The present invention relates to a wire drawing wheel capable of shielding high-frequency noise due to spark discharge caused by contact with an electric wire or suppressing the spark discharge itself.

[0002]

2. Description of the Related Art In general, a wire drawing wheel has a structure in which a surface of an electric wire passage groove of a metal sheave in a wheel body is covered with a buffer material for mechanical protection of a wire to be extended. .

Since such a buffer material is made of an insulating material,
The electric wire and the sheave, which is the main body of the wheel, are in an electrically isolated state.

[0004] However, when the wire drawing wheel is used for wire drawing work near the power transmission line during power transmission, an induced voltage is generated in the wire in the wire extension, and this induces a voltage on the wire wheel main body. As a result, a potential difference is generated between the wire and the sheave, and a spark discharge is generated at a contact point of the electric wire. Further, the same spark discharge may be generated due to static electricity due to contact friction between a wheel and a to-be-wired wire when performing wire drawing work during drying.

[0005] The above-mentioned spark discharge contains a high frequency component which becomes noise, reaches a nearby telecommunication device by spatial propagation, and causes noise disturbance.

Heretofore, in order to suppress such a spark discharge, a grounding arm is provided on a wheel and the grounding arm is electrically contacted with an electric wire.

[0007]

In the above-mentioned prior art wire drawing wheel of the prior art, when wire drawing work is performed near a live line of a large-capacity power transmission line, even a wire wheel having a grounding arm. However, it is difficult to completely suppress spark discharge, and it has been inevitable that high-frequency noise due to spark discharge will propagate to nearby telecommunications equipment and cause noise disturbance.

[0008] Therefore, an object of the present invention is to provide a wire drawing wheel that can reliably suppress the propagation of high frequency noise to telecommunications equipment near the wire drawing work.

[0009]

Means for providing by the present invention In order to achieve the above object, according to the extending line mold wheel consisting comprises a shieldable shield the high frequency noise caused by spark discharge occurs on the sheave during rolling line working, the The shield is from the sheave in the wheel body
Use a large diameter and apply it from the outside of the support frame of the wheel body
And the surrounding wall that covers about half the circumference of the sheave.
By screwing the side wall to the support frame,
Cover, and establish electrical continuity with the wheel body.
, So that high-frequency noise does not propagate to nearby communication equipment.

Further, the surface of the electric wire passage groove of the metal sheave in the wheel body may be coated with a conductive buffer material, and a shield may be provided around the wheel body so as to shield high frequency noise . According to this, it is possible to reduce the electric resistance of the wheel including the cushioning material itself, reduce the spark discharge itself at the time of contacting the electric wire, and still shield the high frequency noise due to the slight spark discharge inevitably generated. Can be reliably shielded.

The shield is preferably made of a composite material of a conductive material and a magnetic material.

Further, the conductive buffer material is preferably made of aluminum, a metal having a lower hardness than aluminum, a conductive plastic, or a composite material thereof.

[0013]

FIG. 1 shows an embodiment of the present invention.
(A) is a front view of a wire drawing wheel, and (B) is a right side view of the wire wheel.

The structure of the sheave 1 itself, which constitutes the wheel body, may be the same as that of the conventional type, and the material may be formed of a conductive metal. The cushioning material 4 for covering the wire passage groove on the circumference of the sheave 1 is made of aluminum, a metal having a lower hardness than aluminum, a plastic having a good conductivity, or a conductive cushioning material made of a composite material thereof. 4 is used.

Further, in this embodiment, in addition to the above structure, high frequency noise can be shielded by using a composite plate or a composite steel such as copper or aluminum having good conductivity and iron having good magnetic conductivity. Shields 2 and 3 were provided. This shield 2,3
Is composed of a side wall 2 having a diameter larger than that of the sheave 1 of the wheel body and applied from the outside of the support frame of the wheel body and a peripheral wall 3 covering the wheel body for about a half circumference. The side wall 2 is screwed to the support frame. In this way, the vehicle is electrically connected to the wheel body and covers the wheel body.

According to the wire drawing wheel of the present embodiment as described above, when the wire is drawn while passing the wire through the wire passage groove of the sheave 1 of the wheel body, the conductive wire covering the wire passage groove is formed. Since the electric wire is in contact with the buffer material 4, the electric conduction between the electric wire and the sheave 1 is always achieved, and the spark discharge can be reduced. Further, the high frequency noise due to the reduced spark discharge is caused by the sheave 1
Can be shielded by the shields 2 and 3 covering the surrounding area, and thus, the propagation of high-frequency noise to the outside can be suppressed, and a predetermined extension work can be performed without causing noise disturbance to nearby telecommunications equipment. .

[0017]

According to the first and second aspects of the present invention, a high frequency noise caused by spark discharge inevitably generated when an electric wire comes into contact with the main body of a wheeled car is covered. Can be shielded by the body.

According to the second aspect of the present invention, in addition to the above shielding effect, the electric wire passage groove of the sheave of the wheel body is coated with a conductive buffer material to reduce spark discharge at the time of electric wire contact. To facilitate the above shielding.

Therefore, according to the present invention, it is possible to attain the intended object of providing a wire drawing wheel that can reliably suppress the propagation of high frequency noise to telecommunications equipment near the wire drawing work. .

[Brief description of the drawings]

FIG. 1 is a front view of a wire drawing wheel, and FIG. 1B is a right side view of the wire wheel in an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel body (sheave) 2 Shield side wall 3 Shield peripheral wall 4 Conductive buffer material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 1/02 H05K 9/00

Claims (4)

(57) [Claims] An object is provided with a shield capable of shielding high frequency noise caused by spark discharge generated on a sheave during wire drawing work.
The shield is larger than the sheave in the wheel body.
To the outside diameter of the wheel support frame.
Side wall and a peripheral wall that covers about half the circumference of the sheave.
Screw on the support frame to cover the sheave.
In addition, a wire- drawing wheel with electrical continuity with the wheel body . 2. The method according to claim 1, wherein the shield is a composite material of a conductive material and a magnetic material.
The wire drawing wheel according to claim 1, further comprising: 3. Passage of an electric wire through a metal sheave in a main body of a wheel and wagon.
The surface of the groove is coated with a conductive buffer material and the wheel body
Do not provide a shield around the
The wire drawing wheel according to claim 1 or 2, wherein: 4. The conductive buffer material is made of aluminum or aluminum.
Metal or conductive plastic or
The wire drawing wheel according to claim 3, comprising the composite material.