US Patent 9506752 Explosion-proof dust of electromechanical level measuring device

An explosion-proof dust of electromechanical level measuring device includes: a explosion proof enclosure (100), formed with a safe chamber area (101) and a hazardous chamber area (102) and a power shaft sleeve (120) is provided for communicating the above two; a power unit (200) disposed inside the safe chamber area (101); a control module (300) disposed inside the safe chamber area (101) and electrically connected to the power unit (200); a capstan (400) disposed in the hazardous chamber area (102); a power shaft (500) sleeved in the power shaft sleeve (120) and two ends thereof are respectively connected to the power unit (200) and the capstan (400); and a pair of bearings (610, 620) disposed in the power shaft (120) and spaced with an interval thereby forming a fireproof path (601).