Navigator 3 is one type explosion proof and intrinsic safety type wheel type routine inspection robot, applicable to the narrow space and uneven ground scenes under type I explosion proof environment like power substation, the robot adopt four differential design, has the characteristics like small size, flexible walking, strong over obstacles capacity, beautiful profile and others, able to replace the personnel to finish the daily routine inspection tasks, validly avoid the manual routine inspection occurred omit inspection, error measurements, vague saved pictures and other problems, make ensure the comprehensiveness and accuracy of routine inspection works.