Signal feedback mechanism for vacuum circuit breaker and vacuum circuit breaker

Abstract

The signal feedback mechanism used for vacuum circuit breakers includes a frame and a micro switch fixed on the frame. The frame is also hinged with a pressing plate and a swing arm mechanism. One side of the pressing plate is connected to one end of the elastic mechanism. The other end of the elastic mechanism is connected to the frame; one end of the swing arm mechanism is kept in contact with the pressing plate, and when the swing arm mechanism rotates, the pressing plate can be separated from or contacted with the micro switch. When the present invention is installed on the vacuum circuit breaker, the swing arm mechanism keeps in contact with the cam plate, transforms the linear motion of the cam plate into the rotary motion of the swing arm mechanism, and indirectly drives the micro switch, thereby avoiding the direct action of the high-speed action of the vacuum circuit breaker To cause damage to the micro switch, ensure that the signal can be correctly fed back to the traction control center.

Description

technical field [0001] The invention belongs to mechanical and electronic automatic control technology, in particular to a signal feedback mechanism for a vacuum circuit breaker and the vacuum circuit breaker. Background technique [0002] Vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. At present, a large number of single-pole vacuum circuit breakers have been used in AC electric locomotives to control the opening and closing of the main circuit, and at the same time have the functions of overload protection and short circuit protection. [0003] Such as figure 1 , 2 As shown, the vacuum circuit breaker is mainly composed of three parts: high-voltage circuit part 1, insulation isolation part 2 and low-voltage control part 3. The key device of the...

AI Technical Summary

Problems solved by technology

In AC electric locomotives, the opening time of the vacuum circuit breaker is required to be 20ms to 60ms, the closing time is less than 60ms, and the action speed is greater than 1m / s. When the cylinder mechanism 11 is inflated or deflated, the opening spring 7 is compressed or reset along the spring rod 6 , drive the cam plate 8 to move up or down, and the cam plate 8 connected to the insulating joystick 4 directly drives the micro switch 1407 to move up or down, because the action speed is too fast, causing the micro switch to stick and fail frequently , The roller frame was broken, resulting in the vacuum circuit breaker opening and closing status signal not being correctly fed back to the traction control center for monitoring, and the monitoring center reported an error code, which directly affected the normal operation of the locomotive

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