Circle chain explosion -proof electric gourd also has a different appearance. Select the appropriate model of ring -chain electric gourd to avoid overloading. Check the ring chain electric gourd before use to see if there are wear, gap and other phenomena. When the electric gourd is lifted, the heavy object should be hung on the center of gravity of the hook to avoid the phenomenon of heavy objects falling. Do not hang it when the heavy object is lifted, so as to avoid shaking the heavy objects, so that the chain load is aggravated. Make heavy objects up in a constant speed, and do not rush to achieve success. People should not stand below the heavy object when they are lifted to prevent heavy objects from falling and danger.