With the continuous progress of society and the continuous improvement of people's living standards, the application of elevators is more and more extensive, and people's requirements for elevators are no longer limited to sitting, but begin to pay more attention to the comfort and safety of riding. Because the elevator is a mechanical product, there is wear and tear in use, and the elevator is a public product, the familiarity of passengers with the product is unpredictable. Therefore, accidents are inevitable in the daily use of elevators. As an effective means to ensure the safety of passengers in the event of elevator failure, elevator emergency devices came into being. Elevator emergency device, equivalent to the "airbag" of the car, is a device for emergency rescue of people trapped in the elevator. Mainly used in elevator operation. When the AC power supply suddenly fails or the electric control system fails, the car stops in the hoistway, cuts off the original electric control system, supplies the elevator with AC power, and opens the door after dragging the car to the flat position, so that the trapped passengers can get out of danger in time. At present, elevator emergency devices have been gradually applied to elevators by well-known brands at home and abroad and become an important part of elevator configuration.