The exposed explosion -proof parts of explosion -proof electric gourds are made of special sparkless materials. The explosion -proof performance is safe and reliable. Explosion -proof electric gourd motors are explosion -proof. The level is ExDIICT4. Electric protection level IP55, insulation level F, and ordinary electric gourds are IP44, insulation level B level B. The four -level explosion -proof electric gourd is made of explosion -proof materials. The hook wheel of the three -stage explosion -proof electric gourd has copper tablets at the mouth of the rope, and the fourth -level explosion -proof electric gourd hook is replaced with stainless steel hook head on this basis. The electrical box, handle and limiter of explosion -proof electric gourds use explosion -proof materials. The whole machine is larger, heavier, and stronger.