Reactor core pressure relief explosion valve controller unlocking and locking device and threshold comparison module thereof

The invention discloses an unlocking and locking device for a reactor core pressure relief explosion valve controller and a threshold comparison module of the unlocking and locking device, and belongs to the technical field of nuclear reactor protection digital instrument control. Three input ends of the comparison unit are respectively connected with a threshold value output by the threshold value setting unit, an analog quantity signal output by the signal sampling unit and a return difference value output by the return difference setting unit, and logic processing is carried out on the input threshold value, the analog quantity signal and the return difference value to generate a threshold value trigger signal and a return difference trigger signal; the trigger unit performs logic processing on the threshold trigger signal and the return difference trigger signal to generate an unlocking trigger signal or an unlocking non-trigger signal; setting of the threshold value and the return difference value is mut