Permanent magnet electric roller explosion suppression performance safety protection device, self-checking method thereof and explosion suppression type permanent magnet electric roller

The invention relates to a permanent magnet electric roller explosion suppression performance safety protection device, a self-checking method thereof and an explosion suppression type permanent magnet electric roller. Explosion-proof joint faces are arranged between center plates of the permanent magnet electric roller and a roller body, a shaft and bearing inner side end covers. At least one setof displacement sensor is mounted at each explosion-proof joint surface through a special bracket; the signal output terminal of the displacement sensor is connected with an intelligent fault diagnosis system, the intelligent fault diagnosis system compares the measurement result of the sensor with the initial set range of the system immediately, and when the measurement result falls into the initial set range of the system, an alarm is given or the permanent magnet electric roller is controlled to stop. The initial value of the explosion-proof gap is measured when the roller does not rotateand is not stressed or is