1. Check the work platform. 2. Whether there is crack in the weld, whether it is desoldered. 3. Whether the platform framework is solid. 4. Is the sole fixing screw fastened? 5, check the mixer a. Whether the screws of the mixer itself are loose. b. Whether the screw of the screw in the mixer is loose. c. Is the oil level of the lubrication system short of oil? d. There is no debris in the mixer. e. The power cord connected to the motor is damaged or exposed. f. Is the fixing screw with the platform fastened? 6. Check the electrical parts of the ribbon cone mixer. a. After the control switch is turned on, the order of re-rotation after self-rotation is correct, and the interval between rotation and revolution is greater than 15 seconds. b. Whether the motor works normally and there is no noise. c. Is the power box and control box intact and the grounding is good?