Group hoist electric hoist is a low speed electric hoist, widely used in small stroke materials loading and unloading, building construction, equipment installation, etc. Group hoist electric hoist has the advantages of slow lifting speed, light weight of machine body, light weight of machine parts, and small wear , Loved by a wide range of customers. At the same time, the group hoist electric hoist needs to be lifted by the lifting column in the welding operation of the welding tank. So how do you know the number of lifting columns? You can know the total amount of the tank body and the weight of other components according to the construction drawing of the storage tank, and calculate the maximum load of the lifting, and the number of lifting columns can be calculated. The formula for calculating the number of uprights, N = (total weight of tank-weight of bottom plate of tank-weight of lowermost tank wall + weight of ceiling platform and accessories + weight of expansion ring) * dynamic load wind load factor * safety factor / inverted chain load. The dynamic load wind load coefficient is 1.25, the chain electric hoist uses 10T grade, and the expansion ring weighs 3000kg. N=(91849-21023-13068+3000*1.25*1.7/10000=12.9. Considering the construction with vaulted roofing, the roof of the tank adopts melon skin driving and lap forming is often an even number, and a single 3000m³ sewage tank is equipped with 14 lifting columns , Equipped with 14 sets of electric chain hoists, which also greatly enhances the safety system