JPH0686418A - Insulator lifting device - Google Patents

Abstract

PURPOSE:To facilitate the positioning of an insulator vertically, horizontally and back and forth in order to anchor a lifted insulator to a hole of a strained wire of a lower pipe member when a transmission line is anchored to a steel tower. CONSTITUTION:The lower ends of two booms 3 are pivotally attached to a pipe member P1. The upper ends of the booms are connected to each other by a boom head 5, and this boom head is provided with suspending hardware 5a and pulling hardware 5b. The booms have a turnbuckle structure, and are adustab1e in length. A chain 8a of a chain block 8 is held to both ends of a triangular yoke 7 which is held to the pulling hardware 5b, and the traction of a wire 9 causes the booms to rise and fall. In preparation for the fall of the booms in excess of the vertical position thereof, an insulator lifting device is provided with a hoisting limiter consisting of multistage cylinders c1, c2 and c3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulator hoisting device used for holding a transmission line to a steel tower.

[0002]

2. Description of the Related Art A pedestal is projectingly fixed to a steel tower arm, a pulley is attached to the tip of the pedestal, and the hoisting insulator is hoisted. All this alignment was a difficult task that relied on skill and hard labor. In the case where the steel tower arm has multiple layers, the hoisting to the upper arm must be performed at a position where it does not interfere with the lower arm and must be pulled to the tower side at a predetermined height, which is particularly difficult.

[0003]

As shown in FIG. 4, a steel tower arm is usually composed of three pipe members, a lower pipe member P1 and a upper pipe member P3. Two booms are pivotally attached to one of the lower pipe members at their lower ends and the upper ends are tied to a single boom head. This boom head is connected to a towable linear member through the upper pipe member P3, and the boom is raised and lowered. A pulley device for suspending the insulator is suspended on the boom head. Both booms have a turnbuckle structure that allows them to be expanded and contracted in order to adjust the hanging position from side to side.

When the hoisted insulator is brought close to the hole aligning position, the boom is approaching an upright posture. Therefore, if the insulator load is transferred to the tie plate, the boom may lose the hanging load and fall to the opposite side. Also, if the boom is too close to the horizontal, the bending moment of the boom becomes excessive, causing a problem. In order to deal with these two cases, it is desirable to provide an appropriate boom hoisting / restricting device.

[0005]

EXAMPLE A steel tower arm comprises an upper pipe member P3 and lower pipe members P1 and P2 (FIGS. 1 and 4). The pair of tight-tie plates 1 is inserted into the lower pipe member P1 and has two holes 1a and 1b formed on its side. The clevis link 2 is pivotally attached to the hole 1a, and the hole 1b is used to hold the top metal fitting of the insulator.
The two booms 3 have a turnbuckle structure, and their lengths can be adjusted by rotating the lever 3a at the center. Further, its lower end is pivotally attached to the clevis link 2. The pair of clevis links are connected by a chain block 4 or a turn bag that can adjust the distance between the pair of clevis links. The boom head 5 supports the hanging metal fitting 5a at the central portion, and the pull metal fitting 5b is rotatably mounted across the hanging metal fitting 5a, and the upper end of the boom is locked at both ends.
The pulley device 6 is suspended from the suspension metal fitting 5a, and the lower insulator G can be suspended by operating the winch. The triangular yoke 7 is equilateral and has a hole at its apex locked to the pull tab 5b, and a hole is formed at the center and both ends at the bottom. In the chain block 8, the end of the chain 8a is locked to the bottom end hole of the pull tab, the wire 9 is connected to the main body 8, and this is locked to the lower pipe member P2 via the upper pipe member P3.

The boom tilt restricting device includes cylinders c1 and c.
2, c3, pistons p1, p2, p3, and a rod 10. One end of the cylinder c1 is locked in the central hole of the bottom of the triangular yoke 7, and the built-in piston p1 is fixed to the head of the cylinder c2. The cylinder c2 slidably penetrates the lid on the other side. Similarly, cylinder c2
The rod 10 is connected to the piston p3. A gripping tool 11 is provided on the outer end of the rod 10. The gripping tool 11 can be gripped with a bolt after it is put on the pipe member P3. Appropriate air holes h are made in each cylinder at both ends of its stroke.

[0007]

By operating the pulley device 6, the insulator G is lifted up to a predetermined height. The chain block 8 is wound up, the boom 3 is raised, and the insulator is brought closer to the tower side. Both booms are lever 3a
By adjusting the right and left positions of the insulator, the top metal fitting of the insulator is brought close to the hole 1b of the tension wire plate. Align holes and connect with bolts.

The boom that has been pulled in to align the holes may exceed the upright position, but it will not fall to the opposite side due to the insulator load. When the insulator is held on the tension plate and the tension is lost, the insulator collapses. At this time, the multi-stage cylinders c1, c2, ... Each serve as an air cushion to buffer the fall, and finally stop the fall at a predetermined angle. The boom that has lost the insulator load is gently restored to the old shape by the load of the pulley device 6. On the contrary, when the boom is tilted down and brought closer to the horizontal position, the tilting stops at the position where the multi-stage cylinder is fully extended, so there is no fear of excessive momentum.

[0009]

[Effect] It is possible to easily adjust the position of the suspended insulator to the front, rear, left and right with respect to the steel tower, and to significantly reduce the work for holding the insulator on the steel tower.

[Brief description of drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a plan view of the present invention.

FIG. 3 is a plan view of the undulation limiting device.

FIG. 4 is an explanatory diagram of a steel tower arm.

[Explanation of symbols]

 P1, P2 Lower pipe member P3 Upper pipe member c1, c2, c3 Cylinder (for undulation limiting device) p1, p2, p3 Piston (same as above) h Air hole 1 Tightening plate 1a, 1b hole 2 Clevis link 3 Boom 3a lever 4 Chain block 5 Boom head 5a Hanging metal fitting 5b Pull metal fitting 6 Pulley device 7 Triangular yoke 8 Chain block 8a Chain 9 Wire 10 Rod 11 Grasping tool

Claims (2)

[Claims] 1. In a steel tower arm having left and right pipe members at the upper part of a steel tower and provided with upper and lower pipe members, a pair of tight wire plates inserted into a lower pipe member and a lower end pivotally attached to the tight wire plates. Adjustable pair of booms, a boom head with both ends supporting the upper end of each boom and a hanging metal fitting and a pulling metal fitting in the center, and a lower insulator suspended from the hanging hardware of the boom head. A pulley device that can be moved upward, a triangular yoke that is locked to the pull tab at the apex of a substantially triangular shape, the end of the chain is locked to the end of the bottom of the triangular yoke, and the main body is connected to the steel pipe through the upper pipe member through the upper pipe member. An insulator lifting device composed of a pair of chain blocks locked to a portion. 2. A final cylinder in which a second cylinder end slidable on the other side lid is fixed to an internal piston of the first cylinder whose one side lid is locked to the bottom side of the triangular yoke, and in which a multistage cylinder is similarly incorporated. The insulator lifting device according to claim 1, further comprising a connecting rod fixed to the inner piston, a gripping tool fixed to the upper pipe member at the outer end of the connecting rod, and an undulation limiting device provided with an air hole in each cylinder. apparatus.