Tool and method for replacing jumper string at double angle hanging point

Abstract

The invention relates to the technical field of power transmission line construction and overhaul and discloses a tool and method for replacing a jumper string at the double angle hanging point. A fixture 1 of the tool is a U-shaped board, two sides of the U-shaped board are respectively integrated with one right angle folded plate, the two right angle folded plates are symmetrical and are provided with a connecting hole which is used to connect an annular screw 3, the annular screw 3 penetrates through the connecting hole and is fixed with the fixture through a nut, and the ring of the annular screw 3 is connected with a cyclic pulley 5. According to the method, the fixture 1 is installed on a double angle hanging point 4 of a tower pole and is fixed through the annular screw 3 and the cyclic pulley 5 is hung on the annular screw 3 for replacing the jumper string insulator. By utilizing the tool and the method provided by the invention, the deformation of a cross arm angle iron can be avoided, people on the tower can finish the binding of the insulators on the cross arm without coming off from the power transmission line, thus the working procedure is simplified, the working efficiency and the safety factor of high-attitude working can be improved; and meanwhile, the structure of the tool is simple, the tool is convenient to use, the process and manufacture are simple and convenient and the production cost is lower, so that the tool is easy to promote and apply.

Description

technical field [0001] The invention relates to the technical field of maintenance of power transmission lines, in particular to a tool and method for replacing jumper strings with double angle steel hanging points. Background technique [0002] At present, most of the single-circuit strain towers use dry-shaped towers, and the hanging points of this tower type are mostly used such as figure 1 As shown in the double-angle steel, the replacement method of this kind of insulator jumper string is mostly replaced by hand hoist at present. In practice, there are some problems in the replacement of hand hoist. [0003] Problems existing in replacement with hand block hoist: [0004] 1. Replacing the insulator jumper string with a hand hoist requires off-line operation. The diversion insulator jumper string is different from the insulator on the wire and has no tension and poor stability. The operator has poor online balance ability and low work efficiency. [0005] 2. To replace...

AI Technical Summary

Problems solved by technology

[0004] 1. Replacing the insulator jumper string with a hand hoist requires off-line operation. The drainage insulator jumper string is different from the insulator on the wire and has no tension effect. The stability is poor. The operator has poor balance ability on the line and low work efficiency

[0005] 2. To replace the dust-proof jumper string insulators with composite jumper string insulators, it is necessary to use a soft ladder to go up and down, the work efficiency is low, and there are still potential safety hazards

[0006] 3. Lifting with a hand block hoist and a steel wire sleeve may easily cause the deformation of the angle iron at the hanging point and the peeling off of the zinc layer, which will affect the overall stress and corrosion resistance of the cross arm

[0007] 4. Since there is no tension in the drain line, the insulator can be pulled up with a circulating pulley, and the pulley is fixed with a steel wire sleeve. Since the steel wire sleeve has a 300mm insertion length at both ends according to safety regulations, it is inconvenient to wind and fix and the steel wire rope sleeve is stressed. It is easy to elongate, so it is far away from the hanging point of the insulator, and it cannot be bound on the cross arm within the effective range of lifting. Although it is conceived, it is rarely used.

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