Rotating axis locking mechanism

Abstract

The invention belongs to low voltage electric equipment, it relates to a rotating axes locking device which is used in low voltage breaker. The device includes the rotating axes base and acting contactor which is mounted in the cavum of the rotating axes base, the acting contactor possesses a pair of rotating arm which can rotate around the core of the rotating axes base, contacting point is set at front end of the rotating arm; a pair of guiding groove are set on the rotating axes base which is beside the acting contactor, a pair of sliding axes are mounted in the guiding groove, the same end of the two sliding axes is connected by reed, the reed draws the two sliding axes and push to the outer side of the rotating arm; there is a segment of protuberance contour line in outer side of the rotating arm, when the dynamic and statistic contactor are in close position, the sliding axes is at the back of the protuberance contour line vertex, when the dynamic and statistic contactor are in cut off position, the sliding axes is at the front of the protuberance contour line vertex. The invention is simple, convenient to assembly, reliable to use.

Description

technical field [0001] The invention belongs to low-voltage electrical equipment, and relates to a rotating shaft clamping mechanism used in low-voltage circuit breakers. Background technique [0002] During the working process of ordinary low-voltage circuit breakers, when there is a large fault short-circuit current in the line, before the operating mechanism operates, the moving contacts should be repelled in advance to overcome the contact pressure under the force of the electric repulsion force, and the rotating shaft is stationary. move. The function of the locking mechanism of the rotating shaft is to make the moving contact stay at the maximum position after the moving and static contacts are separated to the maximum opening distance until the operating mechanism is released under the action of the release, so as to avoid the moving contact due to The fault short-circuit current decreases and the drop causes the arc to reignite. The existing locking mechanism of th...

AI Technical Summary

Problems solved by technology

There are generally two types of locking mechanisms for the existing circuit breaker shafts: one is the moving contact cam structure, when the moving contact is repelled, the cam surface is locked by the fixed action shaft, and the locking structure is simple. , but the reliability is low; the other form is the connecting rod structure, the connecting rod moves back and forth between the dead points, the clamping structure of this form is complicated, the process requirements are very high, and the installation is difficult

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