Group hanging oil tank electric gourd refers to the DHP ring chain electric promotioner. It consists of motors, reducers, upper and lower hooks, chains and other components. Its improvement speed is 0.06 meters/minute --0.18 meters/minute interval, which vary according to different speeds according to the load specifications and the wattering of the motor. The load specification is 5T-30T, which is suitable for 380 volt industrial power consumption. There are different specifications to increase the height of 3 meters to 12 meters. From the above parameters, we can see that its improvement speed is very slow. It has better synchronization when used in multiple units, so it will be called a group hanging gourd. From its load specifications, the load specifications that we can see are large, so it is adapted to 380 volt industrial power. It is an electric gourd chain used to increase the tank when welding in oil tank. The two specifications of 5 tons and 10 tons during oil tanks are more commonly used. Therefore, the characteristics of the electric gourd of the group are: slow, good synchronization, and suitable for improving heavy objects.