a key box

Abstract

The invention discloses a key box. The key box includes a box body and a lock. A terminal block is fixed on the outside of the box body; A cam is fixed, and four micro switches are symmetrically arranged on both sides of the cam, and the micro switches are respectively fixed on the inside of the box, and each micro switch respectively leads a pair of contacts to the terminal platform; when the lock cylinder of the lock drives the cam to rotate, the convex edge of the cam touches the corresponding micro switch. The present invention can trigger the micro switch through the cam, thereby disconnecting the pantograph air circuit and circuit during the key rotation process, and ensuring the closing of the grounding switch to ensure the safety of the staff.

Description

technical field [0001] The invention relates to the technical field of electromechanical interlocking, in particular to a key box which allows operators to protect themselves. Background technique [0002] During the maintenance process of the EMU, it is necessary to operate the high-voltage interlock key box to disconnect the pantograph gas circuit and circuit, and ensure that the grounding switch is closed before opening the high-voltage equipment box; the pantograph gas circuit and circuit cannot be changed during the entire maintenance period. Otherwise, it will cause personal injury to the maintenance personnel; as for the way to prevent misoperation, the existing way is generally to remind by posting warning signs, but this way depends on the vigilance of the staff , still may cause safety risks due to the carelessness of the staff, so it is urgent to design a device to ensure that the state of the pantograph gas circuit, circuit, and grounding switch remains unchanged...

AI Technical Summary

Problems solved by technology

[0002] During the maintenance process of the EMU, it is necessary to operate the high-voltage interlock key box to disconnect the pantograph gas circuit and circuit, and ensure that the grounding switch is closed before opening the high-voltage equipment box; the pantograph gas circuit and circuit cannot be changed during the entire maintenance period. Otherwise, it will cause personal injury to the maintenance personnel; as for the way to prevent misoperation, the existing way is generally to remind by posting warning signs, but this way depends on the vigilance of the staff , still may cause safety risks due to the carelessness of the staff, so it is urgent to design a device to ensure that the state of the pantograph gas circuit, circuit, and grounding switch remains unchanged during the maintenance phase

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