The invention relates to the technical field of
power equipment, and discloses a
relay protection-based pressing plate device, which comprises a device main body, a connecting valve, a platform, a joint, a
knife switch, a resetting device, a positioning device and a retreating device. According to the
relay protection-based pressing plate device, the
rotary valve is rotated to enable the sliding column to drive the clamping block, the pointer observes that the clamping block is separated from the positioning groove, the
rotary valve is lifted to drive the sliding column to be separated from the inflection point of the sliding rail, the locking state of the torsional spring is relieved, the torsional spring loses a positioning object and starts to reset, and the
knife switch is driven to be disconnected, and thebeneficial effect that direct contact with the
knife switch is not needed when disconnecting contact is achieved. The bottoms of the sliding columns make contact with the sliding rails, the clamping blocks are inserted into the positioning grooves when the sliding columns enter, the clamping blocks are positioned through the positioning grooves, the sliding columns connected with the
tail ends of the clamping blocks are synchronously positioned, the sliding columns continuously move on the inner sides of the sliding rails, and after the knife switch makes contact with the connector at the other end, the sliding column is clamped into the corner of the L-shaped sliding rail to form locking, so that the beneficial effect of no looseness after the knife switch is closed is achieved.