A lifting device for large tonnage live conductors

Abstract

The invention relates to an auxiliary device of electric transmission line live-working, and specifically to a hoisting device for large-tonnage live wire, comprising a hoisting cross arm, a leveling stand, a reinforcing device and a hoisting device, wherein there are two leveling stands which are respectively located at both sides of the hoisting cross arm, the upper leveling stand is fixed on the angel steel of iron tower cross arm, and the upside is under fixed connection with hoisting cross arm; the reinforcing device is arranged at the middle part of hoisting cross arm and between the two leveling stands, the upside and downside thereof are respectively under fixed connection with hoisting cross arm and steel angle of iron tower cross arm; hoisting device is arranged at both ends of hoisting cross arm in symmetry, each end is arranged with two hoisting devices. The hoisting device achieves large-tonnage live wire hoisting with smaller insulating materials by adopting four-point hoisting structure, and has fall-arrest backup protection for wire hoisting, which guarantees safety and reliability of large-tonnage wire hoisting live-working.

Description

technical field [0001] The invention relates to an auxiliary device for live work of a power transmission line, in particular to a lifting device for a large-tonnage live wire. Background technique [0002] In recent years, with the continuous improvement of the power grid structure, the number of 500kV transmission lines has gradually increased. With the improvement of the transmission capacity, the wires are mostly used in multi-split transmission mode, and the wire diameter is also increased simultaneously, which causes the vertical load of the tower to increase. At the same time, the path of the 500kV transmission line generally passes through mountainous areas. Due to the large spanning distance of the towers between the two hills, the span of the wires increases, which further increases the vertical load of the towers. In general, for towers bearing large vertical loads, in order to improve the load-bearing capacity of the insulator strings, the suspension mode of doub...

AI Technical Summary

Problems solved by technology

[0004] 1. Generally, the towers with double-string insulators are used in mountainous areas, and the vertical load is generally large. According to statistics, double-string insulators are used in mountainous areas, and the vertical load can reach 6.5 tons or more. If conventional tools are used for live work, because the tools allow The load does not meet the lifting requirements and live work cannot be realized

[0005] 2. If the load of the lifting tools is increased, the metal tools will increase the lifting tonnage, which will inevitably be heavy, which will increase the difficulty of the operator, which is not conducive to the safety of the operation and increases the risk of the operation

At the same time, for the insulation lifting tool, to achieve such a large load lifting, it will bring great difficulties in design and manufacture.

[0006] 3. Since the head of the cross-arm is mostly not flat, the bending and torsion resistance of the insulating material is weak when the operation is live, which puts higher requirements on the lifting position, and it cannot be used at will according to the requirements of power outage operations. At the same time, it must be lifted Heavy load, the mechanical strength of the insulating material is difficult to guarantee

[0007] 4. For live work with a lifting weight of more than 5 tons, during the operation process, there is no insulating material with such performance in terms of insulation backup protection measures to prevent wires from falling

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