The present invention prevents the safety accident to open the door of the manhole in the electric dust collector as a key exchange device of the safety key exchange box for exchanging keys for the safety of the breaker of the blocking box, the high-pressure generator for converting AC to DC In the interlocking device of the key, the key exchange device can easily and simply operate multiple keys simultaneously as a single key.;In general, a key exchange device is a single key for unlocking a plurality of locked manhole door keys, and after unlocking, each key of the manhole door is rotated to remove from the key exchange device, or each key is coupled to the key exchange device and then rotated. As the key of manhole door should be locked as a single key, the working time for exchanging keys is not only long but also the cumbersome operation must be performed because the whole keys must be rotated individually, which shortens the time for working in the manhole door. There was a problem such as a personnel accident or a large-scale electrical accident that could not be done properly to do the electrical work.;The present invention provides a rack gear, a pinion gear, a lever plate and a hinge pin between a single key and a plurality of keys, so that the rotation rods of the lock bundle are coupled to each other and the entire amount of the keys are the key grooves of the lock bundle. If this key is not combined, operation is disabled to prevent personnel or large electric accidents, while turning a single key to allow multiple keys to rotate at the same time, eliminating the hassle of turning and unplugging the keys. As a result, the working time in the manhole is lengthened, allowing meticulous electrical work to be prevented to prevent personnel and large electric accidents.
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