During the use of the electric expansion door, the controller and voltage shall be kept stable, and it is forbidden to wet and break it, and the remote controller shall not be opened without permission. In addition, turn on the clutch when the power is off, and turn off the clutch in time when the power is on. In case of wire winding and knotting on the door, it shall be handled in time. Make a maintenance plan, clean the track of the electric expansion door in time, keep the interior clean, but the track surface cannot be refueled, and keep the track running smoothly. Dust on the surface of the expansion door motor and transmission chain shall be cleaned in time, and lubricating oil shall be added. Check the components and switch control box in the control box, fasten the terminal block, and clean the dust and dirt in the control box, on the surface and on the button. Pay attention to frequently check the up and down travel switch of the expansion door, and add lubricating oil to the slide rail. In addition, the operator shall manually control the expansion door, check the operation, listen to the up and down travel switch position, so that the electric expansion door is in a proper position when it is opened or closed, and strictly prevent the expansion door from punching the top or bottom during the inspection. The operators of the electric expansion door often check the electric brake, manual switch and manual opening device of the expansion door to prevent the operation failure of the electric expansion door in case of emergency, and carry out fire test for the electric expansion door in case of safety accident, that is, check its function with the smoke and temperature sensors near the door body, and the operators can test the function of the expansion door on the linkage platform.