An external mechanical manual opening device and a permanent magnet drive mechanism

Abstract

The invention relates to an external mechanical manual opening device and a permanent magnet driving mechanism. The opening device comprises a manual opening shaft, a fixing base, a bearing and an elastic rolling spring. The bearing is fixedly arranged in the fixing base. The manual opening shaft is horizontally arranged in the fixing base and is arranged on the bearing in a penetrating mode. The front end and the back end of the manual opening shaft both extend out of the fixing base. An eccentric circular column is arranged at the back end of the manual opening shaft. The elastic rolling spring is arranged in the fixing base. The outer end portion and the inner end portion of the elastic rolling spring are fixedly connected with the fixing base and the manual opening shaft respectively. When the opening device is arranged on the permanent magnet driving mechanism, the end face of the eccentric circular column is in face contact with an opening guiding rod of the permanent magnet driving mechanism, and the periphery side face of the eccentric circular column is in sliding contact connection with an opening head of the opening guiding rod. Accordingly, manual opening and automatic closing of the permanent magnet driving mechanism can be achieved, the number of component parts is small, structure is simple and reasonable, stability and reliability of performance are high, self rotating of the opening guiding rod can be avoided, manual rotating is easy and smooth, performance is stable, and service life is long.

Description

Technical field [0001] The invention belongs to the technical field of power supply and power distribution equipment, and particularly relates to an external mechanical manual opening device and a permanent magnet drive mechanism. Background technique [0002] In recent years, the emergence of permanent magnet operating mechanisms for high-voltage switches has been successfully applied to high- and low-voltage switches in power systems with its advantages of simple structure, fewer parts, and high reliability. At present, the structural forms of permanent magnet mechanisms are diversified and the disclosure of many patented technologies has promoted the continuous improvement and improvement of the technical level of permanent magnet mechanisms. For the switch field, no matter what structure type and working mode, the permanent magnet mechanism must have the function of emergency manual opening, aiming to achieve reliable manual opening operation under power failure conditions. ...

AI Technical Summary

Problems solved by technology

[0003] These patents have technically solved the problem of emergency manual opening, but there are also certain defects, which have brought some new faults

One is that there is a very small air gap between the magnetic short-circuit disk and the outer yoke. Due to the long-term non-use after friction, the oxidation and vulcanization of the air, etc., the Fe3O4 and iron sulfide (part of the iron sulfide has diamagnetic properties) are generated in the air gap. ), etc., these substances will produce frictional resistance and stagnation, and at the same time, the magnetism of the permanent magnet will gradually degrade. These shortcomings will directly lead to the inability to realize manual opening and closing or affect the opening and closing speed; In the case of external human factors such as torsion spring pins, torsion spring pins, torsion springs, etc., the torsion spring pins will be damaged by external man-made excessive force, and the torsion spring pins will also fall off due to the excessive force of the torsion spring, thus Directly lead to failure of emergency manual opening

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