Because of its slow improvement and good synchronization, group hanging electric gourds are widely used in large storage tanks. For example: oil tank, gas cabinet, sulfate tank, sewage tank, aggregate warehouse, etc. During construction, the upper hook of the gourd is installed at a fixed point, and the lower hook is fixed on the heavy object. Multiple gourds are improved by control boxing. These tanks are usually after the welding of steel plates is completed. Raise the tank and make the next layer of installation. Therefore, the role of a group of electric gourds in tanks is to start the tank. This type of gourd commonly has 5 tons, 10 tons, 15 tons, 20 tons. The chain length can be made according to the customer's construction plan and the requirements. The common chain is 3 meters, 4 meters, 6 meters, and 9 meters.