JP2002345118A - Grounding roller device and hanging sheave for wire laying work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire laying hanging sheave which can maintain grounded state, without obstructing pay-off of a laid wire. SOLUTION: A hanging sheave part 3 is rotatably supported by a frame 2, with a shaft to comprise a wire laying hanging sheave 1, which is hung from a tower. A grounding roller device 4 is provided on the frame 2. The grounding roller device 4 has an attachment plate 5, fixed to the frame 2 and rollers 6 rotatably supported by the attachment plate 5 with shafts, and the electrical continuity is made between the rollers 6 and the tower by a lead wire 7. The rollers 6 are energized by a pressing spring 10 and are brought into contact with the inside surface of the hanging sheave main part 3, to rotate on the hanging sheave main part 3. The rollers 6 are composed of metal wires bundled radially into brush shapes. Although the rollers 6 keep the contact with the hanging sheave main part 3, while rotating on the inside surface of the hanging sheave main part 3, the rotation of the hanging sheave main part 3 will not be obstructed; and a wire L fed through the hanging sheave main part 3 is paid off smoothly. The electrostatic induction induced in the wire L by other laid wires in live states is grounded to the tower via the hanging sheave part 3 and the rollers 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel and an accessory which is used to extend an electric wire during wire extension work in an electric wire erection work in a live state and an accessory thereof. Is what you do.

[0002]

2. Description of the Related Art An induced voltage is generated on an electric wire being extended due to electrostatic induction between another installed electric wire in a live state and various adverse effects on the surroundings. The wires in the wires must be grounded. For this reason,
At the time of wire overlaying work, a conductor piece is provided at the lower end of the frame on the wire drawing wheel, and it is brought into contact with the annular surface of the wheel,
Alternatively, a conductive grounding roll is provided near the wheel,
The rolling contact is made on the electric wire passing therethrough.

[0003]

In the above-mentioned conventional method, the type in which the conductor piece is brought into contact with the wheel, hinders rotation of the wheel due to frictional resistance and hinders smooth passage of electric wires. Further, the type in which the grounding roll is rolled on the electric wire has a problem that it is difficult to always maintain a contact state due to a jump of the electric wire, and it is difficult to maintain the contact state. Therefore, an object of the present invention is to provide a ground roller device for wire extension work and a wheel having a high grounding effect while maintaining a contact state without hindering rotation of the wheel.

[0004]

In order to solve the above-mentioned problems, in the first invention, a roller 6 is attached to a mounting member 5 for fixing the wire drawing wheel 1 to a steel tower 2 on a steel tower.
Is rotatably supported, is brought into contact with the wheel body 3, rotates together with the wheel body 3 and rolls on the wheel body 3, and the roller 6 is electrically connected to the steel tower via the lead wire 7. The ground roller device 4 for wire extension work was configured. In the second invention, a wheel main body 3 is mounted on a frame 2 suspended from a steel tower.
Are rotatably supported, and are arranged so that the rollers 6 that roll on the wheel body 3 with the rotation thereof are brought into contact with the frame 2.
The lead wire 7 was extended directly or indirectly from the roller 6 so as to electrically connect the roller 6 to the steel tower. In the third invention, the roller 6 is formed in a brush shape with the bristle material made of metal directed radially. In the fourth invention, the roller 6 is supported via the spring 10 and is configured to press against the wheel body 3.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. 1 and 2, a wire drawing wheel 1
Is suspended from a steel tower (not shown) via the puller 1a in the wire drawing work in the electric wire erection work. The overhead wire wheel 1 is configured such that a wheel body 3 is rotatably supported on a frame 2. The frame 2 is composed of a pair of long frame plates 2a and 2 which are vertically opposed to each other and are connected vertically.
a, and a puller 1a is coupled to the upper part. The wheel body 3 is rotatably supported between the frame plates 2 a of the frame 2. Electric wire L is placed around the wheel body 3
Is provided. Gold car body 3
Is made of a conductive metal material. A ground roller device 4 is provided on one frame plate 2 a of the frame 2.

As shown in FIGS. 3 and 4, the ground roller device 4 includes a mounting plate 5 for fixing to the frame 2, a roller 6 rotatably supported by the mounting plate 5, and a roller 6. And a lead wire 7 for electrically connecting the power supply and the tower. The mounting plate 5 includes a base portion 5a that extends along the frame 2 and is welded to an upper portion thereof, and a hinge portion 5b that projects laterally from both ends from one end of the base portion 5a. The mounting plate 5 can be formed integrally with the frame 2. In short, if the rollers 6 can be arranged so as to contact the wheel body 3, the mounting to the frame 2 can be performed directly or indirectly. It does not matter. The lead wire 7 is connected to a bolt 8 that supports the roller 6 by a hinge 5b.
All are fixed. The lead wire 7 is fixed from one end of the hinge portion 5b to the other end of the base portion 5a via the other end, and further extends to the steel material T1 of the nearby steel tower to extend to the ground metal fitting 1.
1 The roller 6 is provided on the outer surface 3 b of the wheel body 3.
, And rolls on the rotating wheel body 2. The roller 6 is formed by bundling a metal wire in a brush shape in a radial direction. The roller 6 is rotatably supported by being axially inserted into a bolt 8 having its shaft 6a screwed to the hinge portion 5b of the mounting plate 5. Bolt 8
Then, a lock nut 9 is screwed to fix the bolt 8 to the hinge portion 5b. A roller shaft 6a is provided between the roller 6 and the bolt 8.
A pressing spring 10 is locked in a compressed state and urges the roller 6 in a direction of pressing the roller 6 from the bolt 8 toward the wheel body 3. The roller 6 rolls on the inner inclined surface 3b with the rotation of the wheel body 3 so as to press against the outer inclined surface 3b of the wheel body 2 to elastically contact and maintain an electrically conductive state. It has become. The grounding bracket 11 has a substantially U-shaped cross-section backing 11a to which the lead wire 7 is connected at the back thereof.
A fastening bolt 11b is inserted into one of the opposing surfaces of the abutment 11a and sandwiches the steel T1 between the other.

[0007] The wire pulling wheel 1 of the wire pulley main body 3 has a wire L in the middle of extension while other wires are being kept hot.
Is sent by the rotation of the wheel body 3, passes through without difficulty, and is extended. At this time, the roller 6 keeps contacting while rolling on the outer surface 3b of the wheel body 3. Since the roller 6 rotates together with the wheel body 3 and has a brush shape, frictional resistance due to contact is small, and the rotation of the wheel body 2 is not hindered. Electrostatic induction occurs between the electric wire L and another installed electric wire in a live state. However, since the electric wire L is grounded to the steel tower through the wheel body 3 and the roller main body 6, the induced current escapes to the ground, and the electric wire L Various adverse effects associated with electrostatic induction are prevented, such as that there is no danger of electric shock even if an operator makes erroneous contact.

[0008]

As described above, according to the present invention, since the rotation of the wheel is not hindered, the electric wire can be passed smoothly, and the behavior of the wheel can be reliably followed to provide a sufficient grounding action. Can be performed continuously.

[Brief description of the drawings]

FIG. 1 is a front view of an electric wire drawing work wheel according to the present invention.

FIG. 2 is a front view of a gold wheel.

FIG. 3 is a front view of the ground roller device.

FIG. 4 is an exploded perspective view of the ground roller device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Overhead wire wheel 2 Frame 2a Frame plate 3 Wheel body 3b Outside surface 4 Ground roller device 5 Mounting plate 6 Roller 7 Lead wire 8 Bolt 10 Press spring 11 Ground metal L Wire

Claims (4)

[Claims] An installation member for fixing to a frame of a wire drawing wheel, a shaft rotatably supported by the mounting member, electrically conducting to a steel tower via a lead wire, and a wire drawing wheel. And a conductive roller that rotates in contact with the roller and rolls on the wheel. 2. A frame suspended from a steel tower, a wheel main body rotatably supported by the frame, and a directly or indirectly rotatably supported by the frame to the wheel main body. A conductive roller, comprising: a conductive roller that contacts and rolls on a wheel with the rotation thereof; and a lead wire that extends from the roller to electrically connect to a steel tower. Gold car. 3. The ground roller device for wire drawing work according to claim 1, wherein the roller is formed in a brush shape with a bristle made of metal directed radially. 2. A wire pulling work cart according to claim 1. 4. The grounding roller device for wire drawing work according to claim 1, wherein the roller is supported via a spring and pressed against the wheel and the wire drawing wire according to claim 2. A working car.