A self-locking device for safe insertion and extraction of plug-in circuit breakers

Abstract

The invention discloses a self-locking device for safety plugging of a plug-in type circuit breaker, and the device is characterized in that the device comprises a support (1); a connecting rod (2) isinstalled in a sliding hole (101) of the support (1); the lower end of the connecting rod (2) is linked with a push rod (3) which is horizontally disposed in an installation hole (102) of the support(1); the push rod (3) is sleeved by a spring (4), and the head of the push rod (3) is linked with the lower end of the support (1); the connecting rod (2) can drive the push rod (3) to make horizontal linear movement in a process that the connecting rod (2) moves up and down in the sliding hole (101). According to the invention, the rotating motion of a conventional self-locking linkage mechanismis changed into translation, thereby improving the stability of the conventional self-locking linkage mechanism, increasing the self-locking support points of a self-locking mechanism, and guaranteeing that a self-locking device causes no failure even if the circuit breaker is plugged in an inclined manner.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a self-locking device for safe insertion and extraction of plug-in circuit breakers. Background technique [0002] The plug-in circuit breaker can separate or connect the circuit breaker and the socket by plugging in and out, which brings convenience to use and maintenance. For operator safety, regulations do not allow unplugging or plugging in while the circuit breaker is energized. The usual approach is to make sure the breaker is off when it is about to be plugged into or about to be unplugged from an outlet. [0003] In order to meet the requirement that the circuit breaker cannot be plugged into or pulled out of the plug-in base in the closed state, there are two traditional solutions. The first is to require the circuit breaker to automatically insert or pull out the plug-in base even in the closed state Tripping; the second is that the plug-in and pu...

AI Technical Summary

Problems solved by technology

Chinese patent 201010263989.7 discloses a plug-in molded case circuit breaker safety plug-in self-locking device, which includes a circuit breaker body, which is provided with an operating mechanism. The operating mechanism includes a connecting rod that can rotate around the rotating shaft. There is a limit step, the limit piece is rotatably installed on a fixed shaft, the limit piece has a connecting arm and a limit arm, the connecting arm is provided with a waist-shaped hole, and a linkage shaft is passed through In the waist-shaped hole and connected to one end of the connecting rod, the bracket is fixed on the bottom of the circuit breaker body, the lock is installed on the bracket for rotation, and the spring is connected between the lock and the bracket. The self-locking device uses a self-locking point in the It is forbidden to insert or pull out the circuit breaker from the base when it is in the closed state. This structure has only one independent fulcrum, which cannot reliably prevent the circuit breaker from being inserted or pulled out when the circuit breaker is tilted to one end, and there is a risk of failure

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