Cable lifting device for maintenance

Abstract

The invention relates to the field of cable maintenance equipment, in particular to a cable lifting device for maintenance. The cable lifting device comprises a base, wherein universal wheels are installed at the bottom of the base, a machine shell is installed on the base, an installation seat is installed on the outer surface of the machine shell for installing a rotating shaft, a rocker and a first gear are installed on the rotating shaft, a second gear is installed at the bottom of the machine shell, an outer ring of the second gear and a first gear mesh with each other for driving, a third gear is synchronously installed at the bottom of the machine shell, an inner ring of the second gear and the third gear mesh with each other for driving, a screw rod is fixedly installed on the third gear, a first telescopic rod is nested on the screw rod, a second telescopic rod is installed in the first telescopic rod, and the upper end face of the second telescopic rod is fixed on a lifting platform. The cable lifting device has the beneficial effects that by adopting a lever driving principle and a multi-section lifting device, the manual acting force during cable lifting is reduced, thelifting overall height is improved, and the safety of maintenance personnel is ensured.

Description

technical field [0001] The invention relates to the field of cable maintenance equipment, in particular to a cable lifting device for maintenance. Background technique [0002] As one of the important livelihood projects in my country, electric power engineering plays a pivotal role in the development of the country. Power transmission is an important link between power plants and residential electricity consumption. The current power transmission is mainly based on cable transmission, including submarine cables, underground cables and surface tower cables. [0003] After the cable has been put into operation for a long time, it is often found that the outer insulation layer of the cable is damaged, the outer insulation layer breaks down, the cable falls and other accidents during maintenance, resulting in power outages for maintenance. Analyze the cause of the accident: First, the alternating current passes through the cable and the air switch, and an alternating electrom...

AI Technical Summary

Problems solved by technology

[0003] After the cable has been put into operation for a long time, it is often found that the outer insulation layer of the cable is damaged, the outer insulation layer is broken down, the cable falls and other accidents during maintenance, resulting in power outages for maintenance

Analyze the cause of the accident: First, the alternating current passes through the cable and the air switch, and an alternating electromagnetic field will be generated around the cable and the air switch. When the temperature exceeds the normal range, some cables exceed the rated current carrying capacity due to the small cross-sectional area, the cable laying is not compact or there are eddy currents, etc., and the outer insulation layer of the cable is damaged and broken down and the cable is dropped.

Second, due to the change of electrical load, the cable will cause stretching fatigue cracking in the vibration bending part

The third is the friction damage between the outer insulating layer of the cable and the cable bracket due to vibration.

For the above reasons, only unplanned power outage maintenance can be performed on the tunnel cables, which will greatly reduce the reliability of power supply, reduce the quality of power supply service, and affect the economic benefits of enterprises

[0004] The maintenance of the cable needs to raise the cable from the bridge to facilitate the maintenance work. During the maintenance of the cable, especially the lifting and maintenance of the middle cable and the upper cable of the bridge are extremely difficult, because there is no lifting support point at the bottom of the cable, the lifting device cannot be placed. The existing technology In the process of lifting the cable, a lifting tripod needs to be set up, and the cable is lifted with a spreader. The maintenance personnel lie on the lower side of the cable to work, and there may be vicious injury accidents where the fulcrum of the tripod tilts across the field, and it also brings many problems to the later maintenance of the cable. difficulty

At the same time, the lifting height of the general lifting device is not enough, and multiple people are required to lift when lifting, and the lifting pressure is relatively high.

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